DE102015210556B4 - Delivery for a sheet processing machine and method for depositing sheets - Google Patents

Abstract

Delivery for a sheet processing machine with a sheet conveyor system for conveying and releasing sheets (7) above a delivery stack (9), with at least one stop (12, 14, 16) for aligning the falling sheets (7) forming the delivery stack (9) is provided andwherein at least one sensor (15, 17, 25, 26, 30) is provided for monitoring the position of at least one sheet (7) with respect to the stop (12, 14, 16), characterized in that the sensor (15, 17 , 25, 26, 30) is designed to monitor a point (17.2, 15.2) located within the stack outline (9.1) and that the sensor (15, 17, 25, 26, 30) for detecting the sheet fall of one or more consecutive falling Arch (7) is formed within the stack outline (9.1).

Description

The invention relates to a delivery for a sheet processing machine with a sheet conveying system for conveying sheets over a delivery stack and a method for depositing sheets.

In the DE 10 2006 040 679 A1 describes a method and a device for depositing sheets of a sheet processing machine on a sheet stack, the sheets being transported by the endlessly rotating sheet conveyor system one after the other over the sheet stack and with the sheet leading edge against the leading edge stops. In order to be able to realize an exact stack formation, stop surfaces assigned to the sheet stacks laterally in the upper area are provided on which a reciprocating movement directed transversely to the sheet transport direction is impressed, whereby the sheets are aligned with respect to their side edge. The position of the side edges of the sheets fed to the sheet stack by the sheet conveyor system in relation to the stop surfaces is detected by ultrasonic sensors that are likewise provided on the side. If the actual position deviates from the target position, adjusting elements for correcting the sheet position are activated or sheet conveyance is interrupted.

The disadvantage is that the sheet feed is only corrected or interrupted if the actual position deviates from the target position with regard to the side edge position. However, this means that only so-called oblique bends with regard to the side edge stops and not also overshoot bends or oblique bends with regard to the front edge stops can be detected. Overshoot bends or oblique bends with respect to the leading edge stops are guided via the gripper systems or the sheet braking system which decelerates the sheets and promotes them against the leading edge stops. If such sheets are carried along by the subsequent gripper systems of the sheet conveyor system, this can lead to a breakdown of the sheet processing machine.

The measure that the sheet feed is interrupted when the position of the side edges deviates from a target position reduces the effectiveness of the sheet processing machine in that all the sheets in the machine are wasted. In addition, it is disadvantageous that the sheets in the machine have to be removed in a time-consuming manner.

From the DE 101 06 669 A1 a device for depositing sheets is known in which measuring devices are arranged in the leading edge stops. In a first embodiment, the measuring device is designed as a touch sensor which can detect the height of the sheet arrival and furthermore the contact intensity. In a second embodiment, the measuring device is designed as a receiver of a light beam emitted by a light source. A connected control and regulating device changes the time of the gripper opening and / or the speed (circumferential speed) of the suction roll and / or the suction force of the suction roll and / or the blowing intensity of the fan. The disadvantage of this solution is that no skewed or overshot bends can be detected.

From the DE 198 19 688 A1 a device for protecting the gripper systems is known in which a mechanical oversheet control is provided. The overshoot arch control contains feeler elements that are pivoted around a frame point when an overshoot arch control occurs. The machine receives the "emergency stop" signal by pivoting the feeler elements. The disadvantage of this solution is that the mechanical scanning of overshoot sheets is prone to errors, since the feeler elements require a safety distance from the gripper carriage path. If an overshoot bend is not detected, the machine can be damaged, especially at high speeds. It is also disadvantageous that no oblique arcs are detected as such.

From the DE 10 2004 021 808 A1 an overshoot arch safety device in a bow boom is known which has levers that can be moved mechanically by overshoot arches. The movement of the levers is monitored by sensors so that the sheet processing machine can be switched off if an overshoot sheet is detected. The disadvantage of this solution is that the mechanical scanning of overshoot sheets is prone to errors, since the levers require a safety distance from the gripper carriage path. If an overshoot bend is not detected, the machine can be damaged, especially at high speeds. Another disadvantage is that no oblique arcs can be detected as such.

From the EP 1 842 817 A2 a device for recognizing irregular sheet layout is known, the delivery having a first stack of sheets and a second stack of sheets arranged downstream thereof. A contactless sensor is assigned to the leading edge stops of the first stack of sheets, which detects irregular sheet transport and stops the sheet processing machine. This results in waste, which has to be removed from the machine in a time-consuming process, whereby the individual sensor only detects overshoots that are very far above, while oblique sheets cannot be detected as such.

The invention is based on the object of providing a delivery for a sheet processing machine create. In particular, the delivery is designed in such a way that accidents caused by incorrectly deposited sheets can be excluded and the effectiveness of the machine is increased.

According to the invention, the object is achieved by a device with the features of the independent device claim or by a method with the features of the independent method claim. Advantageous refinements result from the subclaims, the description and the drawings.

In one embodiment, a delivery (also referred to as a delivery) for a sheet processing machine is provided, with a sheet to a delivery stack and with a sheet leading edge of the sheets at at least two leading edge stops transporting sheet conveying system, the at least two leading edge stops spanning a leading edge stop level, with at least a further stop for aligning the delivery stack is provided on a further edge of the delivery stack and wherein at least one detection unit is designed to monitor at least one point which is located downstream of the leading edge stop plane in the sheet transport direction. In doing so, at least one point upstream of the leading edge stop plane in the sheet transport direction is monitored. At least one sensor is preferably designed to monitor the at least one point. Particularly preferably, the at least one sensor for monitoring the at least one point, in particular the position of at least one sheet with respect to the further stop, is located in front of the front edge stop plane in the sheet transport direction spanned by the front edge stops. The sensor can be designed in any way and is preferably a contactless sensor. The sensor can be assigned to the stack side, for example a side edge stop, and / or the rear edge of the stack, for example a rear edge stop.

At least two further stops are preferably provided in the display for aligning the display stack with two further edges of the display stack. If several sensors are used to monitor the further stops, these are preferably also upstream of the leading edge stop plane in the sheet transport direction. Particularly preferably, at least two side edge sensors for monitoring the side edge stops are arranged upstream of the front edge stop plane in the sheet transport direction. A separate side edge sensor can be assigned to each side edge stop. These side edge sensors, which in particular operate in a contactless manner, are preferably designed as optical sensors or as ultrasonic sensors. In a further development, a further rear edge sensor can also be assigned to the rear edge of the stack. This further trailing edge sensor preferably also works without contact and can be designed as an ultrasonic sensor or an optical sensor, for example as a laser beam sensor. Particularly preferably, trailing edge sensors can be axially adjustable z. B. be designed with a braking station in order to be able to monitor the sheet trailing edges, in particular their falling movement, in the lateral area.

The sensors assigned to the side edge stops and / or the rear edge of the stack can in particular monitor whether a sheet is being deposited on one or both side edge stops. The sensors are connected to a control device for signal evaluation. If a false sheet protrudes in the horizontal direction over a vertical stop surface of at least one side and / or rear edge stop, then the control device, which can be integrated into the machine control or be part of it, generates a signal that can be used to initiate a machine function. A machine function can be the setting of the sheet transport, in particular an emergency stop, and / or adjusting elements for the position and / or alignment of the sheet can be controlled or regulated so that the protruding false sheet falls on the stack and the following sheets do not more to be deposited on the stop. By monitoring the side edge stops and / or rear edge stops, the risk of damage to a sheet or the transport devices is reduced.

The sheet transport can be monitored in such a way that the at least one sensor registers a departure from a proper transport or fall route, possibly with the inclusion of tolerances, and / or that continuous proper transport or proper filing is registered. A machine function is accordingly initiated by the connected control device if the sensor registers a departure from the specified transport path and / or no properly transported sheet. Leaving the specified transport path can be detected, for example, by means of the at least one sensor by checking whether no gripper carriage is detected during a conveying cycle because a gripper carriage is covered by an incorrectly positioned sheet in the detection direction of the sensor. Furthermore, the sensor could be aimed directly at the wrongly positioned sheet.

In a further development, it is provided that the side edge stops arranged on the side of the delivery stack are designed as straight pushers moving towards and away from the stack. Here can When placing a sheet on the straight pusher (s), a machine function can be designed in such a way that the pegged straight pusher or both straight pusher is or will be accelerated in a lateral direction, deviating from the periodic sequence of movements, so that as a result of the arc's inertia, it is accelerated from the or both straighteners slides and falls on the pile. The sweeping lateral movement of the straight pusher (s) gives the sheet sufficient space to sink onto the stack surface. Alternatively or additionally, a slide, a blower and / or suction air device and / or another conveying device can still be actuated when a sheet rests on one or both joggers, so that the sheet in question is returned to the permissible stacking area. In a further development, a sheet brake is arranged in the delivery, which decelerates the sheets to be deposited from machine speed to deposit speed. As a machine function that can be triggered by the control device, it can be provided that individual braking elements of various braking stations are operated in such a way that a subsequent sheet is properly deposited. The braking effect can be specifically adjusted over the sheet width in order to achieve a change in position, in particular a rotation, of the subsequent sheet or sheets in the desired stacking area. The machine functions to be triggered by the control device can also be selected as a function of the printing material or as a function of other parameters.

In a delivery of a sheet processing machine, in which the sheets to a delivery stack and with a leading edge of the sheet at at least two leading edge stops transporting the sheet conveying system, the sensors for side edge stops arranged in front of a leading edge stop plane spanned by at least two leading edge stops are particularly preferably designed in such a way that they determine the position of the Monitor the side edge of the respective sheet in relation to the stop surface and that a signal is output when the side edge lies behind the stop surface of a side edge stop. The side edge stop sensors for the position of the sheet side edge in relation to the stop surface are preferably connected to the control device for evaluating the sensor signals and for executing machine functions. When the signal is output, the control device preferably adjusts the sheet transport and / or activates one or more actuators in such a way that the sheet lying above a stop sinks onto the stack surface. For an exact measurement of the sheet position, the side edge stop sensors can be arranged and designed in such a way that they emit measurement signals in an area of the stop adjacent to the stop surface, and that the position of the side edge is monitored by measuring a signal transit time between a sensor and the respective sheet becomes. The measurement signals can be transmitted, for example, against the underside of the sheet of a sheet located behind the stop surface.

According to one embodiment, a respective side edge stop has an overhead edge, with a sensor assigned to the side edge stop being directed to an area in the vicinity next to the edge. The sensor can monitor the inner edge and / or the outer edge of the side edge stop. If an ultrasonic distance sensor is provided as the side edge stop sensor, its detection area is preferably arranged outside a path of the gripper carriages rotating for transporting the sheets. The side edge stop sensor can be fixed directly or indirectly to the side edge stop in such a way that they can be set together, for example for sheet format setting, in or against the sheet transport direction and / or transversely to the sheet transport direction.

Preferably, in one embodiment, a delivery of a sheet processing machine is provided, with a sheet to a delivery stack and with a sheet leading edge of the sheets at at least two leading edge stops transporting sheet conveying system, with at least one detection unit monitoring the position of the sheets without contact being provided and with the at least one detection unit for Monitoring of at least one point is formed which is located downstream in the sheet transport direction of a leading edge stop plane spanned by the at least two leading edge stops, the at least one monitored point preferably lying within an area that extends from the front edge stop plane up to 100 mm in the sheet transport direction. In a further embodiment, the monitored point is off-center, i. H. the monitored point is arranged across the width of the machine at a distance from the center of the machine.

In one embodiment, a delivery of a sheet-processing machine comprises a sheet conveying system that transports the sheets to a delivery stack and with the leading edge of the sheet against the leading edge stops. The sheet conveying system preferably contains gripper systems which are arranged on traction means and which are conveyed along a circulating path, guided by guide means. The sheets are brought by the gripper systems to a delivery stack arranged in the delivery and released there. The released sheets lie with the leading edge against the Leading edge stops and are thereby aligned. The aligned sheets are deposited on the delivery pile. A detection unit is provided which monitors the position of the sheet leading edge in a contactless manner and is designed to monitor at least one point which is located downstream in the sheet transport direction of a leading edge stop plane spanned by the leading edge stops. Contactless monitoring is preferably to be understood as continuous contactless monitoring without mechanical contact with the sheet. The display is preferably designed as a single-stack display, ie only a single display stack is formed in the display. Accordingly, only one stack lifting device is provided in this display.

The front edge stop plane is spanned by at least two front edge stops arranged at least linearly, preferably in a straight line, on the front side of the delivery stack. However, the front edge stops preferably each have front edge stop surfaces that span the front edge stop plane. The detection unit is arranged in such a way that the point monitored by it lies within an area which, starting from the leading edge stop plane, extends up to 100 mm in the sheet transport direction. The sheet transport direction is preferably the normal vector to the front edge stop plane spanned by the front edge stops. The leading edge stop level is a spatial level here. The spatial plane is particularly preferably not curved. As a rule, the leading edge stop plane runs vertically, but can also form an angle with the vertical. By monitoring the point in the area mentioned, it is advantageously possible to detect crooked bends. The monitored point is preferably an area of minimal extent, but can also be a geometric area or a monitored area.

In a further development, the monitored point is arranged at a distance from the leading edge stop plane. In a further development, the monitored point lies within an area which, starting 1 mm after the leading edge stop plane, extends to 50 mm in the sheet transport direction. In a particularly preferred development, the monitored point lies within an area which, beginning 2 mm after the leading edge stop plane, extends up to 10 mm in the sheet transport direction. This also ensures the detection of oblique bends lying minimally above the leading edge stops. Any machine functions can be triggered when a skew is detected.

In a further embodiment, the detection unit is designed to monitor at least two points which are spaced apart from one another transversely to the sheet transport direction, that is to say over the width of the machine. These two points are preferably evenly spaced from the leading edge stop plane. This means that they are also arranged in the area directly adjoining the leading edge stops in the sheet transport direction. In a further development, these at least two points lie within a minimum sheet format to be processed with the delivery. The machine is designed to process a range of different sheet formats, the upper limit of which is formed by the maximum sheet format and the lower limit is formed by the minimum sheet format. The technical implementation of the possibility of processing different sheet formats is realized through the formation of means for format setting. The machine preferably has format adjustment means such as adjustable sheet guide elements, stop elements, gripper elements or the ability to activate subsystems. The points to be monitored are particularly preferably arranged symmetrically to the center of the machine, provided that the minimum sheet format to be processed is aligned symmetrically to the center of the machine. Alternatively, it is possible to move the minimum sheet format to one of the two sides or to place it on the side of the machine. The points to be monitored by the detection unit can in such a case be arranged in an analogous manner in the minimal sheet format. A relocation of a point to be monitored can further educate z. B. by adjusting a sensor, changing the position of the sensor or deflecting a sensor beam.

In the case of a medium-format printing machine, for example, the minimum working width can be approximately 45% of the maximum working width to be processed.

In the case of several points to be monitored, the acquisition unit or the acquisition units preferably perform a differentiated evaluation of the signals obtained, preferably in conjunction with an evaluation unit. In the differentiated evaluation, a minimal distinction is preferably made as to whether there is an overshoot curve with regard to the leading edge stops or only an oblique curve with regard to the leading edge stops, which is only partially above the leading edge stops. Correspondingly suitable machine functions are initiated accordingly. The machine functions can differ according to the differentiated evaluation of the signals.

In a further development, it is provided that further points by the detection unit or the To monitor registration units. Points outside the minimum sheet format are preferred as further points. Points are selected in a larger sheet format, in particular at the outer sheet edges of the maximum sheet format, which are preferably evenly spaced from the leading edge stop plane. Very particularly preferably, the further points are arranged approximately as far away from the leading edge stop plane in the sheet transport direction as the points arranged in the minimal sheet format. In this way, all, preferably four, points are also arranged in the area directly adjoining the leading edge stops in the sheet transport direction. The further points are preferably also in the same horizontal plane as the points set to the minimum sheet format. Points arranged in this way ensure that the skewed sheets are detected in the minimum sheet format and, advantageously, the security against errors in the detection of sheet misalignments in the maximum sheet format is increased. Alternatively or additionally, scanning sensors arranged in the minimal sheet format can also be designed to be adjustable and / or movable. In particular, the ability of the scanning sensors to move transversely to the sheet transport direction can enable adjustment to the current sheet format. The other points lying outside the minimum sheet format can also be monitored by adjustable or movable scanning sensors. The scanning sensors can include sensors / receivers, for example.

In a further development, the detection unit monitors at least two points which are spaced apart from one another in the sheet transport direction. Accordingly, these points are preferably spaced at different distances from the front edge stop plane, at least the first point in the sheet transport direction being within a range from the front edge stop plane up to 100 mm in the sheet transport direction. The at least two points can be monitored by a single acquisition unit or also by several acquisition units. The monitored points can preferably be evaluated independently of one another by an evaluation unit connected to the at least one detection unit or can be evaluated in a differentiated manner in relation to one another. Particularly preferably, the two points lying one after the other in the sheet transport direction are evaluated independently of one another, in such a way that a machine function is triggered when an overshoot sheet is detected, which is independent of the evaluation of the further point. In particular, an emergency stop is initiated when a safety-relevant overshoot is detected in the downstream point in the sheet transport direction.

In a preferred development, the at least one point is monitored by the detection unit by means of a sensor beam generated by the detection unit. For this purpose, the detection unit has a sensor / receiver, the sensor being set up to generate the sensor beam and the receiver being set up to receive this beam. The sensor / receiver can be arranged on opposite sides of the rotating gripper systems or also above or below the rotating gripper systems and interact with an opposing reflector. Provision is preferably made for the detection unit to be equipped with a sensor / receiver and a reflector, the reflector being arranged on the side of the rotating gripper systems opposite the sensor / receiver. The reflector is particularly preferably assigned to the leading edge stops, as a result of which a compressed design can be achieved. The reflector can be arranged at least partially between two leading edge stops. Optical sensors such as photosensors, for example lasers, are particularly preferably used. However, ultrasonic sensors or other suitable sensors can also be used.

In a further development of this, the reflector is assigned to a receptacle fixed to the frame, it also being possible for the reflector to be integrated in the surface of the receptacle. Further machine elements, such as test sheet fingers, can also be arranged on the receptacle. The sensor / receiver of the detection unit is advantageously arranged on a holder within a deflection area of the sheet conveyor system. In particular, the holder is designed as a crossbeam which is arranged across the width of the machine and has an opening for the sensor / receiver. The traverse can be independent or connected to a blower frame. The blow frame itself can also be used as a holder. The area between the transmitter / receiver and, in the version with a reflector, between the transmitter / receiver and the reflector is monitored by the sensor beam. The sensor beam is preferably formed at least approximately parallel to the leading edge stop plane and very particularly preferably at least approximately perpendicular.

In a further development, the monitoring of the at least one point is also provided during a sample sheet removal and / or a stack change. Permanent monitoring of the at least one point takes place particularly advantageously, only gripper systems that are passing are masked out. It can be provided that an error signal caused by the gripper systems is filtered or masked out. The gripper systems are preferably masked out taking tolerances into account. As tolerances For example, 5 ° to 10 ° based on a machine angle can be provided before and after a gripper system. Particularly preferably, there is also an uninterrupted monitoring in each case between two immediately successive gripper systems.

In a further development, provision is made to assign a cleaning unit to the sensor / receiver and / or the reflector of the detection unit. The cleaning unit works preferably pneumatically to clean the sensor / receiver unit and / or the reflector. The cleaning by the cleaning unit is preferably carried out as required or at intervals according to the instructions of the printer or also automatically.

In another embodiment, a delivery of a sheet-processing machine comprises a sheet conveying system that transports the sheets to a delivery stack and with the leading edge of the sheet at leading edge stops. The sheet conveying system preferably contains gripper systems which are arranged on traction means and which are conveyed along a circulating path, guided by guide means. The sheets are brought by the gripper systems to a delivery stack arranged in the delivery and released there. The released sheets lie with the leading edge against the leading edge stops and are thereby aligned. The aligned sheets are deposited on the delivery pile. A detection unit is provided which monitors the position of the sheet leading edge and is designed to monitor at least one point. The detection unit is designed to detect the angular position of the leading edge of the sheet in relation to the leading edge stops or to detect the presence of a sheet at at least two points spaced from one another and monitoring differentiating with respect to the points spaced apart.

The position of the sheet leading edge preferably means the presence or absence of a sheet area at a defined point in time or the qualitative angular position of the sheet leading edge, preferably in relation to a reference point or a reference line or the like, or the quantitative angular position of the sheet leading edge. The angular position is preferably understood to mean the position of the respective sheet leading edge in relation to the leading edge stop plane spanned by the leading edge stops. The angular position of the sheet leading edge is preferably viewed in a horizontal plane, particularly preferably at the level of the stack surface. The angular position can preferably be expressed in terms of degrees.

A differentiated monitoring of two spaced-apart points means that a minimal distinction can be made between an overshooting curve, which lies with its entire leading edge over the leading edge stops, and an oblique curve, which is only partially above the leading edge stops. This makes it possible to reliably determine whether overshoots or skewed sheets are being fed to the delivery stack. This gives the opportunity to correct the position of these sheets while the machine is running or to run the sheet processing machine empty and then to make a correction. As a result, the resulting waste and machine downtimes can be reduced and the effectiveness of the sheet processing machine increased.

In a further development, provision is made for the detection unit to monitor at least two points arranged at a distance from one another longitudinally and / or transversely to a sheet transport direction. The two points, which are spaced apart from one another, preferably lie transversely to a sheet transport direction within a minimum sheet format characteristic of the sheet processing machine. Particularly preferably, a further detection unit is arranged downstream of the detection unit for monitoring the at least one point within an area starting from the leading edge stop plane in the sheet transport direction up to 100 mm. The further detection unit is preferably assigned to a deflection area of the sheet conveyor system assigned to the delivery stack. In particular, the further detection unit is arranged for monitoring an area after the reversal point of the gripper systems of the sheet conveyor system. The area monitored by the further detection unit is preferably arranged at an angle of 0 ° to 90 °, particularly preferably between 60 ° and 80 °, to the horizontal. At least one further point is preferably monitored with the further detection unit. The further point is particularly preferably at least 200 mm away from the monitored point arranged in the area of the leading edge stops. The position and / or presence of a sheet is preferably monitored in a contactless manner by the detection unit or the detection units. The position and / or presence of the sheet in the sheet transport direction after the leading edge stops is particularly preferably detected by the detection unit or the detection units. To detect the incorrectly deposited sheets, the detection unit or the detection units can have scanning sensors, for example with sensors / receivers. In a further development, each of the scanning sensors interacts with a cleaning unit.

In a further development, the registration unit or the registration units differentiate between an overshoot sheet with respect to the Leading edge stops and an oblique arc with respect to the leading edge stops, with different machine functions preferably being able to be initiated or triggered depending on the evaluation. If a crooked bow is detected, for example an operating unit can be activated, the machine can be blanked or an emergency stop can also be initiated. In this case, blanket printing by the machine is preferably carried out as a function of the sheet material, in particular a printing material, preferably as a function of the weight per unit area, so that the necessary security is ensured. Thin substrates located in the machine can be partially or completely printed out, while thicker substrates such as e.g. B. cardboard z. B. require an emergency stop with a basis weight greater than 150g / m ^2. In a further development, the operating unit can also display the oblique arc, in particular in relation to the leading edge stops. In a further development, the machine function can change a delivery setting and / or the operating unit can output a printer instruction. The printer instruction can then be supplied to an operator or carried out confirmed by the operator.

In a further development, however, it can also be evaluated which area of a crooked arc lies above the leading edge stops. In a further development, the specific misalignment of the crooked arc can also be recorded in terms of degrees. This can take place in particular for a straight line formed by at least two leading edge stops. The straight line is preferably formed by the front edge stop surfaces of the front edge stops at the level of the stacking surface or on the upper edge of the front edge stops facing the gripper carriage. The position of the arch can be displayed accordingly or corrected by suggesting settings or changing settings.

In one embodiment, the detection unit can monitor the presence of a sheet in at least two points at defined times, preferably in a defined machine state, in particular at a defined machine angle, these points being in a first variant transverse to the sheet transport direction and in another variant along the sheet transport direction. In a further variant, points can be monitored both across and along the sheet transport direction. The detection unit can have several scanning sensors, in particular for monitoring the at least two points. Particularly preferably, the points lying transversely to the sheet transport direction are monitored by a first detection unit and the further point following in the sheet transport direction by a further detection unit. It is very particularly preferable for the points lying transversely to the sheet transport direction to be monitored by the first detection unit via a plurality of scanning sensors and the subsequent point by the further detection unit by means of a further scanning sensor. The scanning sensors can have sensors / receivers, for example. Alternatively, all variants of these points can be monitored by at least one detection unit, for example via a camera.

The assignment of a further detection unit in a further area, in particular in a reversing area of the sheet conveyor system transporting the sheets to the delivery stack, allows the gripper systems assigned to the conveyor system to be checked for entrained sheets and thus excludes damage to the sheet processing machine. By spacing the further detection unit away from the leading edge stops, it is possible to safely deduce a security-relevant oversize sheet when an overshoot sheet is detected, and any paper scraps detected are also classified as security-relevant overshoot sheets. An emergency stop of the machine preferably takes place in the event of a signal generated by the further detection unit. The emergency stop takes place particularly preferably independently of the signal evaluation of the upstream detection unit. The further detection unit particularly advantageously increases the security for the printer that no sheet has been conveyed back to the machine even if the upstream detection unit detects a skew or overshoot. The laborious search for non-existent security-relevant sheets in the delivery, which was previously necessary, is reduced or avoided.

In a further embodiment, the at least one detection unit detects the angular position of the sheet leading edge in relation to the leading edge stops. Here, the angular position of the sheet leading edge of the deposited sheet can be monitored before the leading edge stops, at least partially above the leading edge stops and / or after the leading edge stops. The detection unit can have a camera, in particular a CCD camera, as a sensor. If the sheet is in a correspondingly incorrect position, the filing process is influenced by the detection unit and / or corresponding information is provided. The angular position can be recorded, for example, as a number of degrees or as a distance to a stop in a unit of length, preferably in millimeters.

A mechanism and / or software are used to hide the gripper carriages in a defined manner during the passage of the registration unit or the registration units. Preferably the masking takes place by means of angle values determined on a sprocket main shaft. While a gripper carriage passes through the blanking area, a signal generated by the detection unit is accordingly not evaluated as a skew or overshoot. The registration unit or the registration units monitor the sheets in a particularly advantageous manner in a completely contactless manner.

Since an oblique arc is only partially above the leading edge stops, it is still held by at least one leading edge stop in some areas, so that a safety-relevant event cannot be inferred directly in the event of an oblique arc. As a result of the evaluation of the detection unit, if a crooked bow is detected, either an emergency stop can be initiated as the safest variant. Alternatively, in a further variant, after a skewed sheet has been detected, all the sheets present in the machine can be deposited at production speed. This advantageously results in a significantly reduced expenditure of time since, compared to an emergency stop, the sheets in the machine do not have to be conveyed out, in particular typed out. In order to avoid accidents, a distinction is made according to the type of arch used. In particular, z. B. at a basis weight above 150 g / m ² a first machine function and below this basis weight another machine function can be initiated. In order to avoid accidents, a differentiation according to the type of printing material used, for example cardboard and paper, can be provided in a printing machine. When processing cardboard, e.g. B. with a weight per unit area greater than 150 g / m ² , an emergency stop is accordingly initiated by the machine control after a skewed sheet is detected according to the first variant. B. with a weight per unit area of less than 150 g / m ² , an empty printing of the machine is carried out according to the second variant.

In a further alternative variant, the machine is not stopped, but special mechanisms ensure that the sheets are correctly positioned in the pile. This can be done by giving instructions to the printer, by suggesting changes to settings, automatic changes to settings or actuating the actuator. For actuator control, all actuators that actively or passively influence the sheet deposit come into consideration, for example the movement of the front and / or side edge stops, the fan setting, the setting of individual or all brake elements, etc. or the stack lifting device. The action of the printer is enhanced by displaying the skew and / or printer instructions. The printer can thus receive information to improve sheet depositing manually or by changing the delivery setting. In a further development, it is provided that the intended function, in particular the machine function, is selected as a function of the printing material used, the side of the inclined position, the inclined position in terms of degrees and / or other boundary conditions.

• 1: die schematische Darstellung einer Auslage in Seitenansicht;
• 2: eine Draufsicht des Auslagestapels mit ordnungsgemäß abgelegten Bogen;
• 3: eine Draufsicht des Auslagestapels mit über einem Seitenkantenanschlag liegenden Falschbogen;
• 4: die ausschnittsweise Darstellung eines Greiferwagens mit einem V orderkantenanschlag ;
• 5: eine Draufsicht des Auslagestapels mit Schiefbogen;
• 6: das Prinzip einer Reinigungseinheit in Seitenansicht;
• 7: eine Weiterbildung der Auslage in Seitenansicht;
• 8: Draufsicht auf die Gitterstruktur mit integrierten Reflektoren;
• 9: perspektivische Ansicht eines Ausschnittes der Auslage mit Gitterstruktur;
• 10: Weiterbildung der Auslage mit in der Traverse integrierter Reinigungseinheit;
• 11: Ausschnitt der Draufsicht des Auslagestapels;
• 12: Auslagestapel in Bogentransportrichtung gesehen mit sensorüberwachten Seitengeradstoßern;
• 13: Draufsicht auf einen Auslagestapel mit Hinterkantensensoren;
• 14: Seitenansicht eines der Bremsstation zugeordneten Hinterkantensensors;
• 15: Seitenansicht eines der Bremsstation zugeordneten Hinterkantensensors in Kombination mit einem Stapellückensensor;
• 16: Stapelgrundriss mit möglichen Überwachungsbereichen.

In the following, the invention is to be explained by way of example. The accompanying drawings show:

• 1 : the schematic representation of a display in side view;
• 2 : a plan view of the delivery stack with properly deposited sheets;
• 3 : a plan view of the delivery stack with a false sheet lying over a side edge stop;
• 4th : the partial representation of a gripper carriage with a leading edge stop;
• 5 : a plan view of the delivery stack with an oblique sheet;
• 6th : the principle of a cleaning unit in side view;
• 7th : a further development of the display in side view;
• 8th : Top view of the lattice structure with integrated reflectors;
• 9 : perspective view of a section of the display with a lattice structure;
• 10 : Further development of the delivery with a cleaning unit integrated in the crossbeam;
• 11 : Detail of the top view of the delivery stack;
• 12th : Delivery stack viewed in sheet transport direction with sensor-monitored side joggers;
• 13th : Top view of a delivery stack with trailing edge sensors;
• 14th : Side view of a trailing edge sensor assigned to the braking station;
• 15th : Side view of a trailing edge sensor assigned to the braking station in combination with a stack gap sensor;
• 16 : Stacked floor plan with possible monitoring areas.

In 1 a display of a sheet-processing machine, here in particular a sheet-fed printing machine, especially a sheet-fed offset rotary printing machine, preferably in aggregate and in-line construction, is shown. The machine will operated accordingly in the offset process, with other printing processes such. B. screen printing can be integrated in the machine. In the machine's works, the sheets are made 7th Gripped by gripper systems from rotating cylinders at the front edge and transferred between the cylinders in the gripper connection. The sheets are in the printing units 7th in a printing nip formed by a cylinder and a rubber cylinder, each colored with a printing ink according to the motif. Furthermore, one or more coating units can be provided in which the sheets 7th can be painted by a coating forme cylinder. The cylinders arranged in the machine can be single-sized or multiple-sized, with a single-sized cylinder having at least one arc 7th can accommodate maximum format on the circumference. The cylinders are preferably double-sized. The machine can also have a turning device for turning the sheets 7th included in a perfecting mode while the machine is running. Next, finishing facilities or finishing plants, such as. B. cold foil works, be integrated in the machine.

The last one from the sheet-fed printing press is a double-sized printing cylinder 1 shown schematically. From the delivery are a drive sprocket 2 and a pulley 3 shown. The sprockets 2 and 3 are each with a wave 4th , 5 connected on which coaxially spaced a further drive sprocket 2 or a chain sprocket 3 are arranged. About the sprockets 2 , 3 each becomes an endless chain 6th , which forms a chain circle. The arcs are at a constant distance from each other between the two chain circles 7th holding gripper carriage 8th arranged. The sprockets 2 , 3 and the chains that entwine them 6th form together with the gripper car 8th a sheet conveyor system, which can also consist of other elements. In particular, the deflection of the gripper carriage 8th instead of through the idler sprockets 3 also take place through deflection guides. The all-round guided grab carriages 8th have gripper systems to take over the sheets 7th on the leading edge of the impression cylinder 1 on.

For safe transport of the gripper trolleys 8th held bow 7th are a sheet guiding device in the delivery and for quality assurance of the sheets processed in the sheet-fed rotary printing press 7th for example a dryer 19th and / or a pollination unit 20th intended. The sheet guiding device can be a gripper carriage 8th facing sheet guide plate 18th have, which is provided with blown air nozzles and extends over the width of the machine. Under the sheet guide plate 18th Blow boxes are preferably arranged, via which the blow air nozzles are supplied with blow air, so that between the sheet guide plate 18th and that of the gripper carriages 8th transported bow 7th a supporting air cushion can be formed in particular for perfecting. To glue the bow 7th on the display pile 9 should be avoided above the sheet guide device, especially above the sheet guide plate 18th , Dryer 19th and one the bows 7th powdering pollination unit 20th provided, whereby it is also possible to heat the sheet guide plate 18th in the area of the dryer 19th to be able to control or regulate, to integrate a coolant circuit.

There is still a stack from the display 9 standing from a stacking plate 10 is shown. The stacking plate 10 is a lifting mechanism, not shown, which is operated by means of lifting chains 11 on the stacking plate 10 attacks, assigned. There are also leading edge stops on the display 12th , a braking unit 13th and trailing edge stops 14th shown. The leading edge stops 12th and the trailing edge stops 14th are spaced from one another on a transverse to a sheet transport direction 39 arranged along the running axis (e.g. 2 , 3 or 5 ). The braking unit 13th can e.g. B. a transverse to the sheet transport direction 39 extending suction roll or, as shown in the exemplary embodiment, circumferentially spaced apart braking elements, such as suction rings or suction belts 13.1 , exhibit. Alternatively, the braking unit 13th also include followers.

The 2 Figure 10 shows a top view of the delivery stack 9 with properly on the leading edge stops 12th discarded bow 7th who have favourited the delivery pile 9 form. The leading edge stops 12th are preferably symmetrical to a machine center 38 shown arranged. The braking unit 13th contains here, for example, four transversely to the sheet transport direction 39 arranged with suction bands 13.1 equipped braking stations, each suction belt 13.1 a sheet to discard 7th applied with a braking force. The suction belts 13.1 are preferably symmetrical to the axis of symmetry of the sheet in the sheet transport direction 39 . The side edges of the sheet 7th lie parallel to the sheet transport direction 39 . The display pile 9 is at least one more stop 16 , 14th for aligning the delivery stack 9 at another edge of the delivery stack 9 assigned. The side edges of the sheet 7th are preferred here by one side edge stop 16 aligned. The side edge stops 16 are made in one piece here, but can also be made in several parts. The side edge stops 16 can extend over the entire arc length or only over partial areas of the arc length. The side edge stops can provide further training 16 for setting the format, for example, together with the brake unit 13th adjusted. It is intended to develop the side edge stops 16 than across the sheet transport direction 39 movable side kickers 16 to execute. The Side kickers 16 can each have a stop plate, a longitudinal guide and a linear drive. If the sheet is properly laid down, the sheet is lying down 7th in the middle of the stop plates of the side jogger 16 . Further training are also at the rear edge of the delivery stack 9 for example below the brake unit 13th especially movably mounted trailing edge stops 14th intended.

The side edge stops 16 is at least one sensor 17th , 15th for monitoring the sheet position with regard to the side edge stops 16 assigned. The sensor can 17th , 15th both side edge stops 16 monitor or it's every side edge stop 16 a side edge sensor 17th assigned. The sensor or sensors 17th , 15th can be spaced from or near the side edge stops 16 be arranged. The sensor or sensors 17th , 15th can also be arranged at the rear edge, preferably in the side area. In the embodiment shown, each side edge stop is 16 a side edge sensor 17th assigned adjacent. The side edge sensors 17th can use the side stops 16 be permanently assigned. In a preferred embodiment, the side of the stop plates are the side edge stops 16 arranged side edge sensors 17th designed as ultrasonic distance sensors, which each emit a measuring beam in the vertical direction on the underside of the sheet. Alternatively or additionally, the side edge sensors 17th but also the area of the stack floor plan 9.1 monitor and in each case the properly falling bow 7th detect. The side edge sensors 17th are in signaling connection with a control device. The drives for the side kickers are also a further development 16 with this control device, which can be part of the machine control or can be integrated in the machine control, in connection.

The 3 shows a so-called false sheet that has not been properly filed 7.1 , which is at least partially on a stop plate of a side edge stop 16 has dropped. In this position the measuring beam of the side edge sensor hits 17th on the underside of the false sheet lying above the stop plate 7.1 . According to the travel time principle, the side edge sensor, which is designed as an ultrasonic distance sensor 17th generate a signal which informs the control device that a false sheet 7.1 over a stop plate of a side edge stop 16 lies. In a further development, the control device can evaluate both side edge sensors 17th determine on which of the side edge stops 16 or side kickers 16 the false sheet 7.1 is filed. The detection depth of the ultrasonic distance sensor is preferably to be dimensioned in such a way that when a gripper carriage passes through 8th no false sheet 7.1 is signaled. A machine angle transmitted by a rotary encoder is preferably processed by the control device when a machine function is initiated.

A machine stop, in particular a quick stop, is preferably initiated by the control device as a machine function when a false sheet 7.1 is detected. The machine function can be dependent on the substrate. For example, a machine stop can be initiated when cardboard sheets are being processed and another machine function when no cardboard sheet is being processed. In a further development, there is provision for the side kick (s) 16 to be controlled in such a way that the false sheet 7.1 from the stop plate or plates down onto the surface of the delivery stack 9 falls. If, in the case of an ultrasonic distance sensor, a signal is sent that a false sheet 7.1 is on a stop plate, then a drive, in particular the linear drive of the side jogger, can be used by means of the control device 16 , are controlled in such a way that the stop plate for aligning the false sheet 7.1 is moved away from the stack face. The false sheet falls due to an acceleration of the stop plate that occurs in the process 7.1 due to its inertia from the stop plate down to the surface of the delivery stack 9 . The upper side of the stop plates can be chamfered towards the outside. Is the original false sheet 7.1 properly on the delivery pile 9 A further alignment of the following sheets can be stored 7th through the side kickers 16 respectively.

In a further development it is provided with the at least one side edge sensor 17th the location of the false sheet 7.1 to be determined quantitatively. The value of the protrusion of the false sheet can preferably be used 7.1 above the side edge stop 16 and / or an angle value of the side edge of the false sheet 7.1 to the sheet transport direction 39 be determined. This is preferably done by means of the control device, which uses the data obtained to determine the lateral movement of the lateral jogger (s) 16 including the necessary stroke. The side jogger, which performs a periodic jolting motion during normal operation 16 are briefly adjusted by the necessary stroke by the control device if necessary. In the event of a misalignment of the false sheet 7.1 can alternatively or additionally include an actuator control to correct the misalignment of the false sheet 7.1 and / or the following sheet 7th be made. For example, the misalignment can be achieved by deliberately changing the speed and / or braking effect of the braking elements of the braking unit 13th across the sheet width.

In 4th is above the leading edge stops 12th a grab cart 8th with a Chain guide 22nd shown in the deflection area. Above the leading edge stops 12th and the rotating gripper carriage 8th is on a holder 23 a registration unit 24 positioned. The registration unit 24 has at least one here but preferably two scanning sensors 25th , 26th which are arranged at a distance from one another. The scanning sensors 25th , 26th are transverse to the sheet transport direction 39 and arranged to detect the presence or absence of the delivery stack 9 as well as with the sheet leading edge at least partially over the leading edge stops 12th transported oblique bow 7.2 is possible. The scanning of the leading edge stops 12th in sheet transport direction 39 subsequent leading edge monitoring area 12.3 by the scanning sensors 25th , 26th takes place at points 25.4 , 26.4 by sensor beams 25.3 , 26.3 . The sensor beams 25.3 , 26.3 intersect the points to be monitored 25.4 , 26.4 . The leading edge surveillance area 12.3 extends from that of the leading edge stop surfaces 12.1 the leading edge stops 12th spanned leading edge stop level 12.2 in sheet transport direction 39 up to 100 mm, preferably from 1 mm to 50 mm and very preferably from 2 mm to 10 mm. The ones in this leading edge surveillance area 12.3 located points 25.4 , 26.4 are preferably spaced from the leading edge stop plane 12.2 so that, for example, a movement of the delivery stack 9 no error signals generated during lowering. The monitoring takes place preferably at defined times or at defined machine angles, preferably constantly when there is no gripper carriage 8th the sensor beams 25.3 , 26.3 happens. In the same way, overlay sheets, which have leading edge stops relating to the sheet format, are made 12th protrude, captured. Alternatively or additionally, the acquisition unit 24 also the specific position of the arches 7th to the leading edge stops 12th are recorded.

The 5 Figure 10 shows a top view of the delivery stack 9 with properly on the leading edge stops 12th discarded bow 7th who have favourited the delivery pile 9 form. The leading edge stops 12th are preferably symmetrical to a machine center 38 shown arranged. The registration unit 24 monitored here preferably with the scanning sensor 25th and the scanning sensor 26th in the leading edge monitoring area 12.3 the leading edge stops 12th a working width across the sheet transport direction 39 . The working width is at least that transversely and horizontally to the sheet transport direction 39 Extensive extension of a sheet format to be processed minimally by the machine 27 . The possible position of a crooked arc is also shown 7.2 above the delivery pile 9 .

The sheet position is particularly preferably monitored in a contactless manner. The scanning sensors 25th , 26th the registration unit 24 can for example be designed as optical, in particular photoelectric, sensors or as ultrasonic sensors. In the illustrated embodiment, the scanning sensors contain 25th , 26th one transmitter / receiver each 25.1 , 26.1 and one reflector each 25.2 , 26.2 . Transmitters / receivers are preferred 25.1 , 26.1 on one side and the reflectors 25.2 , 26.2 arranged on the opposite side of the gripper carriage track. This minimizes the cabling required. The reflectors 25.2 , 26.2 are here between the leading edge stops 12th shown arranged. In alternative embodiments, not shown, the reflectors 25.2 , 26.2 also with the leading edge stops 12th be connected or the leading edge stops 12th even as reflectors 25.2 , 26.2 can be used. The registration unit 24 is connected to the machine control station and / or the machine control via an evaluation unit, whereby the evaluation unit can also be integrated in the machine control. The machine control can therefore also use the side edge sensors 17th and / or the trailing edge sensors 15th be connected and evaluate their signals together. The distance between the scanning sensors 25th , 26th is preferably selected in such a way that it is just within a minimum sheet format characteristic of the sheet processing machine 27 lie. Alternatively, the scanning sensors 25th , 26th also have a sensor element on one side of the gripper carriage path and a receiver element interacting with this on the other side of the gripper carriage path. At least one of these elements is below the highest point of the leading edge stops 12th arranged.

The one in the window between the chains 6th arranged and constantly revolving with these gripper trolleys 8th capture the on the impression cylinder 1 lying bow 7th at their sheet leading edge and transport them via the sheet guide device, in particular the sheet guide plate 18th , as well as the brake unit 13th in sheet transport direction 39 to the delivery pile 9 . Go through the arches 7th the area of the braking unit 13th they become, for example, from the suction belts 13.1 captured and by the gripper carriage 8th Approved. By means of the braking unit 13th become the arch 7th decelerated to a deposit speed that is reduced compared to the transport speed and released after this speed has been reached, so that the released sheets 7th with the depositing speed against the leading edge stops 12th as well as aligning with these and the opposite rear edge stops 14th aligns the delivery pile 9 be stored forming, with the delivery stack 9 corresponding to the arched sheet 7th is lowered so that the stack surface is a constant level for incoming sheets 7th having.

Usually on the sides of the delivery stack 9 the side edge stops 16 or side kickers 16 arranged the the arch 7th align with regard to the position of their side edges and those of the side edge sensors 17th and / or trailing edge sensors 15th be monitored. For example, as in 5 shown by the suction belts 13.1 the braking unit 13th a crooked bow 7.2 so on the display pile 9 filed that an interruption of the beam path of the sensor beam 26.3 of the scanning sensor 26th takes place is in one of the registration unit 24 downstream evaluation unit generates a signal that causes a skew 7.2 indicates. This means that the sheet feed to the sheet processing machine can be interrupted, the machine can run dry and the crooked sheet 7.2 removed or its position corrected.

It is also possible after a crooked bow 7.2 indicated that the machine should continue to operate and the position of the oblique arc 7.2 on the display pile 9 to correct.

In 4th is the holder 23 another registration unit 29 assigned. This further registration unit 29 has at least one further scanning sensor 30th on, which is designed as an optical, in particular photoelectric, sensor in the exemplary embodiment and a transmitter / receiver 30.1 as well as a reflector 30.2 contains. The further registration unit 29 is arranged in the display in such a way that, for example, the deflection area of the gripper carriage 8th can be detected. Through the further registration unit 29 this area is monitored to determine whether arc 7th or parts of these from the gripper carriage 8th got carried away. If this is the case, you can use one to connect to the further acquisition unit 29 interacting evaluation unit to generate an emergency stop signal, which can be fed to the machine control and displayed at the control station. This means that a breakdown in the sheet processing machine can be caused by the gripper carriage 8th entrained bow 7th be prevented.

Through the further registration unit 29 it is preferably also ensured that the by means of the detection unit 24 detected overshoot or oblique arc 7.2 that the machine is emptied and / or the sheet position is corrected on the delivery pile 9 actually require such bows 7th acts. In order to avoid error signals when passing through the gripper carriages 8th through the sensor beams 25.3 , 26.3 , 30.3 these error signals must be masked out. This is done here by a half-speed driven switching flag that activates initiators arranged depending on the angle. Alternatively, those from the gripper trolleys 8th caused error signals can be filtered using software or similar.

In order to deposit the color of the freshly printed sheet in sheet-fed rotary printing presses 7th can avoid using the pollination unit 20th Powder between the ones on the display pile 9 bow to be filed 7th to be brought. Despite known devices for preventing the depositing of powder on working organs provided in the display, it cannot be ruled out that powder z. B. on the scanning sensors 25th , 26th , 30th the registration units 24 , 29 which can lead to malfunctions. To ensure that the registration units work safely 24 , 29 to enable one or each registration unit 24 , 29 , in particular one or preferably each scanning sensor 25th , 26th , 30th to be assigned at least one cleaning element.

The 6th shows one of the scanning sensors 25th , 26th , 30th assigned cleaning unit 31 containing in the exemplary embodiment a nozzle unit 32 with a blown air supply 33 . Each of the scanning sensors is preferred 25th , 26th , 30th a nozzle unit 32 assigned. Each nozzle unit 32 is in particular with a first outlet opening 32.1 and a second outlet opening 32.2 provided, the blown air jet 34 the first outlet opening 32.1 on the sensor / receiver 25.1 , 26.1 , 30.1 and the blown air jet 35 the second outlet opening 32.2 on the reflector 25.2 , 26.2 , 30.2 is directed. For cleaning the scanning sensors 25th , 26th , 30th the registration units 24 , 29 are the blown air supplies by means not shown 33 activated and thus removes powder deposits. The cleaning unit 31 can be operated as required or its activation at certain work steps, such as changing the delivery stack 9 , be coupled.

The 7th shows a further development of the display with a detection unit 24 for the detection of overshot bends and oblique bends 7.2 in which the leading edge stops 12th in sheet transport direction 39 downstream leading edge monitoring area 12.3 . The registration unit 24 also has at least two spaced apart scanning sensors here 25th , 26th on which sensor beams 25.3 , 26.3 preferably parallel to that of the leading edge stop surfaces 12.1 the leading edge stops 12th formed leading edge stop level 12.2 produce. The leading edge stop surfaces 12.1 the leading edge stops 12th are the ones for the delivery pile 9 directed surfaces on which the correctly released and deposited sheets 7th aligned with the leading edge. The leading edge stop surfaces 12.1 the leading edge stops 12th have at least one vertical extension and preferably one extension transversely to the sheet transport direction 39 , in particular a horizontal extension. Any scanning sensor 25th , 26th preferably has a sensor / receiver here 25.1 , 26.1 and a reflector 25.2 , 26.2 on. The sensors / receivers 25.1 , 26.1 are within the Grab carriage track in the deflection area of the grab carriages 8th a holder 23 assigned. The holder 23 can, for example, be used as a traverse across the width of the machine with openings for the sensors / receivers 25.1 , 26.1 be executed. The traverse can be independent or connected to a blower frame. As a holder 23 but the blow frame itself can also be used.

The reflectors 25.2 , 26.2 are assigned here to a receptacle arranged below the gripper carriage track, which has recesses for the front edge stops across the width of the machine 12th Is provided. The receptacle is here preferably as a cross member or lattice structure arranged across the width of the machine 36 running with the reflectors 25.2 , 26.2 can be integrated in the surface of the recording. A lattice structure fixed to the frame is preferred 36 used, which receives further machine elements on its underside. The machine elements are separating elements, in particular test sheet fingers 37 , which are used for sample sheet removal in the direction of the delivery stack 9 between falling bows 7th to accommodate these are retractable. The proof sheet fingers 37 are designed here as pneumatic cylinders. Due to the fixed arrangement of the receptacle, the connected reflectors remain 25.2 , 26.2 Stationary and active even when a sample sheet is removed. The leading edge stops 12th can be designed to be pivotable for sample sheet removal. The depositing process can therefore also be monitored continuously while a sample sheet is being removed. Even during a stack change, in particular a non-stop stack change, the detection unit 24 the filing process can be monitored without interruption.

The display here contains one of the registration units 24 in sheet transport direction 39 downstream further registration unit 29 for the detection of machine-endangering overshoot bends. The one in the direction of the rotating gripper carriage 8th the registration unit 24 downstream further registration unit 29 also has a further scanning sensor here 30th with a sensor / receiver 30.1 and a reflector 30.2 on. The sensor / receiver is also preferred 30.1 the further registration unit 29 in an opening of the holder, which is designed, for example, as a traverse 23 recorded. Via a connection between the registration units 24 , 29 via a common evaluation unit or each acquisition unit 24 , 29 associated evaluation units with a controller, in particular the machine controller, and preferably the control room, corresponding information and / or functions, in particular machine functions, are triggered. At least one but preferably all of the sensors / receivers 25.1 , 26.1 , 30.1 and reflectors 25.2 , 26.2 , 30.2 is also a cleaning unit here 31 assigned.

The 8th shows a top view of the lattice structure 36 with integrated reflectors 25.2 , 26.2 in the display. The lattice structure 36 preferably points in the sheet transport direction 39 oriented slots that allow air to circulate in the display. The reflectors 25.2 , 26.2 are here in the surface of the lattice structure facing the gripper carriage track 36 integrated. The reflectors 25.2 , 26.2 are within a distance from each other, which is the minimum sheet material to be processed by the machine, i.e. the minimum sheet format 27 corresponds to. That is, the reflectors 25.2 , 26.2 are arranged so far apart that the smallest sheet format to be processed still has one of the reflectors across the width of the machine 25.2 , 26.2 in the case of a crooked arc 7.2 and both reflectors 25.2 , 26.2 covered in the case of an overbend.

The 9 shows a perspective view of a section of the display with in the lattice structure 36 integrated reflectors 25.2 , 26.2 . The one with the reflectors 25.2 , 26.2 interacting sensors / receivers 25.1 , 26.1 are above and particularly preferably vertically above the reflectors 25.2 , 26.2 within the deflection area of the gripper carriage 8th arranged. The sensor / receiver 30.1 the further registration unit 29 acts with a reflector, not shown 30.2 together, in the direction of rotation of the gripper carriage 8th preferably after the turning point outside the chain guides 22nd is arranged approximately in the middle of the machine width.

The 10 shows a preferred development of the display with the holder, for example designed as a cross member 23 integrated cleaning unit 31 for all scanning sensors 25th , 26th , 30th the registration units 24 , 29 in sheet transport direction 39 seen. The cleaning unit 31 contains an actuatable blown air supply 33 that the each scanning sensor 25th , 26th , 30th assigned nozzle unit 32 supplied with blown air. That of the cleaning unit 31 The available pneumatic pressure can preferably be set manually or automatically and is particularly preferably monitored. The blown air supply 33 acts with a holder, which is designed as a traverse, for example 23 associated connection and distributes the blown air to the nozzle units via two distributors shown here as an example 32 the scanning sensors 25th , 26th , 30th . Each nozzle unit 32 directs the blown air present here, too, preferably towards the sensors / receivers 25.1 , 26.1 , 30.1 and the reflectors 25.2 , 26.2 , 30.2 as already described above.

The 11 shows a detail of the top view of the delivery stack 9 with within a yourself across the sheet transport direction 39 extending minimum working width, ie within a minimum sheet format characteristic of the sheet processing machine 27 , arranged leading edge stops 12th . The properly filed sheets 7th lie down in the sheet transport direction 39 on the leading edge stop surfaces 12.1 the leading edge stops 12th from. The ones from the scanning sensors 25th , 26th the registration unit 24 monitored points 25.4 , 26.4 lie in the sheet transport direction 39 the leading edge stop level 12.2 downstream in a leading edge monitoring area 12.3 and across the sheet transport direction 39 within the in sheet transport direction 39 over the leading edge stop level 12.2 in addition to the extended minimal sheet format 27 .

It becomes a delivery for a sheet processing machine with a sheet 7th to a display pile 9 and with a leading edge of the sheet the sheet 7th at at least two leading edge stops 12th transporting sheet conveyor system, wherein the at least two leading edge stops 12th a leading edge stop level 12.2 clamp, with at least one further stop 16 , 14th for aligning the delivery stack 9 at another edge of the delivery stack 9 is provided and wherein at least one detection unit 24 , 29 to monitor at least one point 25.4 , 26.4 , 30.4 is formed in the sheet transport direction 39 the leading edge stop level 12.2 is downstream and at least one of the leading edge stop level 12.2 in sheet transport direction 39 upstream point 17.2 , 15.2 is monitored. At least one sensor is preferred 17th , 15th to monitor at least one point 17.2 , 15.2 formed in the sheet transport direction 39 the leading edge stop level 12.2 is upstream.

The at least one registration unit 24 , 29 is in particular as one of the leading edge stop plane 12.2 downstream point 25.4 , 26.4 , 30.4 contactless monitoring registration unit 24 , 29 educated. The at least one detection unit is preferred 24 , 29 to monitor at least two points 25.4 , 26.4 , 30.4 formed which transversely to the sheet transport direction 39 spaced apart from the leading edge stop plane 12.2 are downstream. The at least one of the leading edge stop level 12.2 downstream point to be monitored 25.4 , 26.4 , 30.4 or the at least two monitored points 25.4 , 26.4 , 30.4 are preferably within a transverse to the sheet transport direction 39 extending minimum working width 27 , especially within a minimal sheet format to be processed with the delivery 27 . The at least one registration unit 24 , 29 is particularly preferably one for monitoring the at least one point 25.4 , 26.4 , 30.4 used sensor beam 25.3 , 26.3 , 30.3 arranged generating. The at least one registration unit 24 , 29 at least two a sensor beam 25.3 , 26.3 , 30.3 have limiting elements.

Next to that of the leading edge stop level 12.2 in sheet transport direction 39 downstream at least one point 25.4 , 26.4 , 30.4 can also be the or can also be the leading edge stop level 12.2 upstream points 17.2 , 15.2 from the at least one registration unit 24 , 29 be monitored. Alternatively, in addition to the at least one acquisition unit 24 , 29 another sensor 17th , 15th can be used for monitoring. The at least one registration unit 24 , 25th or the at least one registration unit 24 , 25th and the other sensor 17th , 15th are advantageously connected to an evaluation or control device, the evaluation or control device initiating a machine function, in particular a machine stop, if the sheet is not deposited properly. The evaluation or control device can also be integrated in the machine control. In a further development, the evaluation or control device can be in operative connection with at least one actuator for sheet position correction.

At that of the leading edge stop level 12.2 upstream point 17.2 , 15.2 the location of at least one arc is preferred 7th regarding the further attack 12th , 14th , 16 supervised. A sensor is preferred 17th , 15th to monitor the position of at least one sheet 7th regarding the further attack 16 , 14th set up, trained and / or arranged. Used at the point to be monitored 17.2 , 15.2 if it detects that the sheet is not being deposited properly, a machine function, in particular a machine stop, can be initiated. The machine function can be initiated depending on a processed printing material. As an alternative or in addition, if the sheet is not deposited properly, a sheet position correction can be performed using an actuator.

That of the leading edge stop level 12.2 upstream point 17.2 , 15.2 can be inside or outside the stack layout 9.1 lie. The stack floor plan 9.1 can be described by the four vertical planes intersecting the sheet edges or the planes of the stack side surfaces. Next is the point to be monitored 17.2 , 15.2 preferably between a gripper carriage path of the sheet conveyor system and the surface, in particular the last sheet that was properly deposited 7th , of the delivery pile 9 . The point to be monitored 17.2 , 15.2 can be, for example, in the area and / or height of the stops 12th , 16 , 14th of the delivery pile 9 are located.

For monitoring the at least one of the leading edge stop level 12.2 upstream point 17.2 , 15.2 is preferred by the at least one sensor 17th , 15th a sensor beam 17.1 , 15.1 which generates the point 17.2 , 15.2 . cuts. The sensor beam 17.1 , 15.1 can stack the floor plan 9.1 or a stop plane 12.2 , 14.2 , 16.2 of the attacks 12th , 14th , 16 cut or almost vertically aligned a protrusion of a sheet 7th at a stop 12th , 14th , 16 detect. The sensor beam particularly preferably contains 17.1 , 15.1 a vertical directional component, especially in the direction of the gripper carriage path. The at least one sensor 17th , 15th is preferred as a non-contact sensor 17th , 15th and can be used as an ultrasonic sensor 17th , 15th or as an optical sensor 17th , 15th be trained. The at least one sensor 17th , 15th is particularly preferred in the sheet transport direction 39 in front of the leading edge stop level 12.2 arranged.

The at least one of the leading edge stop plane is preferred 12.2 upstream point 17.2 , 15.2 non-contact monitored. In particular, the at least one sensor 17th , 15th therefore for contactless monitoring of the position of at least one sheet 7th regarding the further attack 12th , 14th , 16 educated. The at least one sensor is particularly preferred 17th , 15th for contactless monitoring of the position of individual sheets 7th a sequence of arcs with regard to the further stop 12th , 14th , 16 educated. However, several different edges of the delivery stack are preferred 9 assigned points 17.2 , 15.2 supervised. The one or more sensors provide further training 17th , 15th for monitoring at least two spaced apart points 17.2 , 15.2 educated. Several points to be monitored are preferred 17.2 , 15.2 different sides of the delivery pile 9 are assigned, with two points to be monitored 17.2 opposite sides of the delivery stack 9 can be assigned. Another point to be monitored can be added 15.2 another edge, in particular a rear edge, of the delivery stack 9 be assigned.

The at least one sensor is preferred 17th , 15th for monitoring the leading edge stop level 12.2 upstream point 17.2 , 15.2 spaced from the stop surface 16.1 , 14.1 of the further stop 16 , 14th arranged. The at least one sensor is a further development 17th , 15th at a distance from the further stop 16 , 14th arranged. The at least one point to be monitored 17.2 , 15.2 can be shifted to a sheet format when the format of the delivery is changed. The at least one sensor 17th , 15th be relocated for format setting. For example, the at least one sensor 17th a side edge stop 16 , especially a side kick 16 , be assigned. Alternatively or additionally, a sensor 15th a rear area, in particular a rear edge stop 14th , of the delivery pile 9 be assigned. In particular, a sensor 15th a format adjustable braking station of a braking unit 13th be assigned. At least two sensors are particularly preferred 15th , especially in the lateral areas, rear edge stops 14th assigned.

During the sheet travel can at least one of the leading edge stop plane 12.2 upstream point 17.2 , 15.2 monitored whether a proper sheet sequence is present or whether a faulty sheet position is present. It can be from the at least one acquisition unit 24 , 29 and / or the at least one sensor 17th , 15th a sensor signal is emitted when the sheets are properly deposited or, alternatively, when the sheets are not properly deposited. In particular, the sensor signals from several monitored points 17.2 , 15.2 , 25.4 , 26.4 , 30.4 evaluated together. Incorrect sheet deposit can be recognized, for example, if at least one of the points to be monitored 17.2 , 15.2 , 25.4 , 26.4 , 30.4 , for example by the evaluation or control device, a faulty sheet position is detected. The monitoring of several, especially all, points to be monitored 17.2 , 15.2 , 25.4 , 26.4 , 30.4 takes place particularly preferably at the same time, so that a quick reaction can take place. For example, the evaluation or control device can distinguish between a false sheet 7.1 , an oblique arc 7.2 and a clamping bow, which is between two stops 12th , 14th , 16 is jammed. In a further development, the machine function is initiated depending on the detected fault. A machine function can include, for example, printing out the machine, in particular at production speed. The machine function can also include a change in the machine speed.

It becomes a delivery for a sheet processing machine with a sheet conveyor system for conveying sheets 7th via a delivery pile 9 provided, with at least one stop 12th , 14th , 16 for aligning the delivery stack 9 is provided, with at least one sensor 15th , 17th , 25th , 26th , 30th for monitoring the position of at least one sheet 7th regarding the attack 12th , 14th , 16 is provided, and wherein the sensor 15th , 17th , 25th , 26th , 30th for monitoring a point 17.2 , 15.2 inside the stack outline 9.1 is trained. The stack floor plan 9.1 can be described by the four vertical planes intersecting the sheet edges or the planes of the stack side surfaces.

The sensor is preferred 15th , 17th , 25th , 26th , 30th for detecting the sheet fall of one or more consecutive falling sheets 7th inside the stack outline 9.1 set up, trained and / or arranged. In particular, the sensor 17th for monitoring the position of the sheet side edges in relation to a side edge stop 16 , especially a side bumpers 16 , intended. At least two are particularly preferred with regard to the delivery stack 9 sensors arranged on opposite sides 17th designed to collect the sheet fall.

The sensor 15th , 17th can, for example, use the stack layout 9.1 or a stop plane 12.2 , 14.2 , 16.2 of the attacks 12th , 14th , 16 intersecting sensor beam 15.1 , 17.1 be arranged generating. The sensor beam is particularly preferred 17.1 , 15.1 a stop level 12.2 , 14.2 , 16.2 below a common line of intersection 28 from gripper carriage level 8.1 and stop level 12.2 , 14.2 , 16.2 arranged cutting. The sensor beam 15.1 , 17.1 thus intersects the vertical side face of the stack below the intersection line 28 and above the stack surface that forms. The gripper carriage level 8.1 can be done by directly above the delivery pile 9 in sheet transport direction 39 running gripper carriage track or by itself directly above the delivery stack 9 horizontally in the sheet transport direction 39 moving gripper impacts of the gripper carriage 8th be stretched. Through the one stop level 12.2 , 14.2 , 16.2 intersecting sensor beam 15.1 , 17th , 1 will be arch 7th detects which is already a fall distance between the attacks 12th , 14th , 16 have covered. This allows in particular between the attacks 12th , 14th , 16 fixed arch 7th , so for example clamping arcs can be detected, which otherwise cannot be detected.

From the at least one sensor 15th , 17th a sensor signal can be output when a falling arc 7th is detected or recognized. A plurality of sheets falling in direct succession, in particular, are preferred 7th detected. The sensor stands for further education 15th , 17th , 25th , 26th , 30th is connected to an evaluation or control device, which data is available about the sheet transport. The sensor signals of the sensor 15th , 17th are preferably compared with target values by the evaluation or control device, a machine function, in particular a machine stop, being initiated when tolerance limits are exceeded.

The 12th shows a display pile 9 in sheet transport direction 39 seen with sensor-monitored side edge stops 16 . The side edge stops 16 are preferred here than against the stack side edges of the delivery stack 9 movable side kickers 16 executed. The side edge stops 16 each have one of the stacking areas of the delivery stack 9 facing stop surface 16.1 each one vertical side edge stop level 16.2 spans. The side edge stop planes 16.2 are preferably perpendicular and parallel to the sheet transport direction 39 stretched aligned.

At least one prefers both of the side edge stops 16 is a side edge sensor 17th assigned. A side edge sensor 17th can, for example, on a side kick 16 be arranged without having to perform shaking movements. A side edge sensor 17th creates a sensor beam 17.1 , the one in the between the side edge stops 16 located area is directed. In particular, the sensor beam is 17.1 in the stack layout 9.1 of the delivery pile 9 directed. In addition to the in the stack layout 9.1 directed component has the sensor beam 17.1 preferably also a vertical component in the direction of the overlay stack 9 rotating gripper carriage 8th on. Falling arcs are preferred 7th through both side edge sensors 17th in a respective side edge monitoring area 16.3 detected or recognized. The side edge monitoring area 16.3 can, for example, from the side edge stop level 16.2 a side edge stop 16 up to about the middle of the delivery pile 9 be educated. The side edge monitoring area is preferably located 16.3 adjacent to the side edge stop plane 16.2 and can be up to 150 mm in the stack layout 9.1 pass.

The at least one side edge sensor 17th is in connection with an evaluation device or a control device, for example the machine control. By means of the evaluation or control device, the side edge sensor 17th signals delivered as actual values are compared with predefinable setpoint values. In particular, both side edge sensors 17th together with respect to a respective falling arc 7th evaluated. If the tolerance value is exceeded, a corresponding machine function can be initiated. In particular, a filing error is detected when the side edge sensor 17th the bow 7th does not recognize at predetermined times and / or when the angle difference (in particular the machine angle as a state parameter of the printing machine for dynamic sheet deposit monitoring) or the distance between two adjacent sheets following one another 7th is too big or too small. The sensor signals can preferably be interpreted as arcs 7th that hangs firmly in the shaft (clamping arch) or as an arch 7th which is axially offset over one of the side edge stops 16 is located (false sheet 7.1 or oblique arc 7.2 ). It is particularly advantageous that the storage shaft blocking arch 7th (Clamping arc) can be recognized. Both arcs are particularly preferred 7th recognized those outside of the stack outline 9.1 lie (false sheet 7.1 or oblique arc 7.2 ), as well as bow 7th that block inside the storage shaft (clamping arch). In a further development, suitable measures can be initiated, in particular in accordance with the detected fault, which avoid an accident. It creates an improved bow fall control.

It becomes a delivery for a sheet processing machine with a sheet conveyor system for conveying sheets 7th via a delivery pile 9 provided, with stops 12th , 14th , 16 for aligning the delivery stack 9 are provided, with at least one sensor 15th , 17th , 25th , 26th , 30th is provided for monitoring the sheet deposit and wherein a sensor 15th , 17th is designed such that with this at least two successively falling sheets 7th are detectable. At least two sensors are preferred 15th , 17th at a distance from one another and designed in such a way that sheets falling simultaneously with them 7th are detectable. For example, at least two sensors 15th at a distance from one another a rear edge of the stack, in particular rear edge stops 14th , and / or a stack side edge, in particular side edge stops 16 , be assigned.

The at least one sensor is preferred 15th , 17th as a non-contact sensor 15th , 17th , in particular as an optical sensor or as a laser sensor. With the non-contact sensor 15th , 17th the sheets that fall one after the other when depositing the sheets 7th detected. With the sensor 15th , 17th are thereby the successively falling arcs 7th preferably detected individually, the sensor 15th , 17th outputs a sensor signal when a falling arc 7th is detected. The trailing edge sensor can provide further training 15th be designed with background suppression. A minimum and a maximum sampling location, in particular the monitored point, can also be used 15.2 , 17.2 , be designed to be changeable or adjustable.

The at least one sensor can also 15th , 17th , 25th , 26th , 30th are connected to an evaluation or control device, which data is available about the sheet transport. This data can be entered or generated automatically. The evaluation or control device has, in particular, a memory in which characteristic data such as target values or tolerance values, for example as job-dependent curves, are stored. The evaluation or control device can compare the sensor signals with data about the sheet transport, with one or more incorrectly falling sheets being detected 7th a machine function, in particular a machine stop, can be initiated.

In particular, a control by the sensor can be carried out at predetermined times 17th , 15th take place at times in which the target position of the sheet 7th is exactly known and / or can be determined structurally: For example, in a first point in time shortly after the gripper carriage passage with gripped sheets 7th a sensor interrogation take place, with a sensor signal means that a good sheet, i.e. a sheet falling without errors 7th , is present. For example, a sensor interrogation can take place at a second point in time shortly before the gripper carriage passage, with a sensor signal indicating that an incorrectly deposited sheet, for example a false sheet 7.1 , is present. To do this, the sensor should 17th , 15th with respect to the sheet transport direction 39 in the area in front of the gripper opening of the gripper carriage 8th be positioned.

The 13th shows a plan view of a delivery stack 9 in the delivery of a sheet-processing machine, in particular a sheet-fed printing machine, for example as described above. There are leading edge stops in the delivery 12th , Side edge stops 16 and trailing edge stops 14th intended. The leading edge stops 12th tension a leading edge stop level 12.2 in the sheet transport direction 39 at least one sensor 15th , 17th for monitoring the sheet deposit and / the position of the sheets 7th regarding at least one attack 12th , 14th , 16 is upstream. Trailing edge sensors are shown 15th that the sheet deposit or the position of the sheet 7th regarding the trailing edge stops 14th and / or the side edge stops 16 monitor. The trailing edge sensors 15th are the trailing edge stops 14th assigned adjacent and designed as non-contact sensors, in particular optical sensors, for example as CCD sensors, or laser sensors. These show a sufficiently good response behavior. In particular, there are at least two trailing edge sensors 15th at a distance from each other assigned to the lateral areas. The format of the trailing edge sensors is further developed 15th so that they can always be directed towards the lateral areas of the sheet trailing edge. Due to the lateral arrangement of the trailing edge sensors 15th can both the position of the sheet trailing edges with respect to the trailing edge stops 14th as well as indirectly the position of the sheet side edges with respect to the side edge stops 16 be monitored.

A trailing edge sensor is particularly preferred 15th a format adjustable braking station of the braking unit 13th assigned so that a positioning of the trailing edge sensors 15th can be made to the current sheet format. By setting the format of the at least one braking element, for example a suction belt 13.1 , load-bearing braking station an automatic format setting of the connected trailing edge sensor takes place 15th . However, further braking stations with trailing edge sensors can also be used 15th be provided so that the accuracy of the monitoring of the sheet trailing edges over the format width can be improved. A trailing edge sensor is particularly preferred at each braking station 15th attached so that an evaluation is always ensured in the endangered lateral or outer format area.

The trailing edge sensor is preferred 15th a sensor beam 15.1 designed and arranged generating so that the arc drop area can be monitored. Every single falling bow is preferred 7th detected. In the case of an incorrectly filed sheet 7th , for example one on a side fence 16 and / or a suction belt 13.1 filed false sheet 7.2 , an incorrect sheet sequence and thus incorrect sheet deposit is recognized. An improper sheet deposit classified as safety-relevant can then lead to an initiation of a machine function, in particular to a machine stop, as already described above.

The 14th shows a display pile 9 from the side with one in front of the delivery pile 9 arranged brake unit 13th . The braking unit 13th contains a braking station with a rotating suction belt 13.1 or brake band around the released sheet 7th to decelerate from machine speed to depositing speed. The braking station and other braking stations, not shown, are on a transverse to the sheet transport direction 39 arranged traverse 14th in particular movably attached. A format-dependent setting of the braking stations is preferably carried out over the arch width on the crossbeam 14th . The traverse 14th can be used as a trailing edge stop 14th the trailing edges of the sheets to be deposited 7th align. The traverse can provide further training 14th separate trailing edge stops 14th be assigned in particular movable, on which the sheet trailing edges of the sheet to be deposited 7th align. The trailing edge stops 14th can, for example, by one in the sheet transport direction 39 oriented swivel axis, the traverse can be swiveled 14th be assigned. The traverse 14th and / or the trailing edge stops 14th each have one of the stacking areas of the delivery stack 9 facing stop surface 14.1 on that one stop plane 14.2 stretch. The stop level 14.2 is preferably perpendicular and transverse to the sheet transport direction 39 stretched aligned.

The trailing edge (s) 14th is the at least one trailing edge sensor 15th for the detection of falling sheets 7th assigned. The trailing edge sensor 15th can for example above the traverse 14th be arranged. The trailing edge sensor is preferred 15th from the stop level 14.2 , that is to say from the sheet trailing edges falling perpendicularly here, at a distance of 0 to 150 mm, but preferably 10 to 50 mm. For example, through the trailing edge sensor 15th the trailing edge of the sheet can be detected at a height of 20 to 40 mm above the stack surface. The at least one trailing edge sensor 15th can the traverse 14th be assigned fixed or movable. To improve the quality of the measurement result, one or more trailing edge sensors 15th be designed to be rotatable and / or pivotable. The trailing edge sensor is preferred 15th but assigned to a braking station and thus adjusted with this. The trailing edge sensor can provide further training 15th be adjustable in height, for example with the level control of the stack surface. The one from the trailing edge sensor 15th generated sensor beam 15.1 can have an at least approximately horizontal extension directed in the direction of the bow fall area.

The sensor beam is shown 15.1 with a downward component. The inclination of the sensor beam can also be used 15.1 be designed to be changeable or adjustable to the horizontal.

The bow falling in the bow fall area 7th pass through the sensor beam 15.1 and be at a monitored point 15.2 by means of a receiver or pick-up of the trailing edge sensor 15th detected. The one from the trailing edge sensor 15th monitored point 15.2 can be within the sheet fall area or at the sheet trailing edge. The trailing edge of the sheet in particular can be recognized very well by the optical sensor or laser sensor, for example as a line. The trailing edge sensor 15th is preferably designed such that each individual sheet 7th a series of consecutively falling arcs 7th can be detected. The trailing edge sensor (s) 15th are in connection with an evaluation or control device, for example the machine control. By means of the evaluation or control device, the trailing edge sensor 15th transmitted signals are compared with predefinable target values. For example, at least two, in particular the outer, or all trailing edge sensors 15th together with respect to a single respective falling bow 7th evaluated. If the tolerance value is exceeded, a corresponding machine function can be initiated. In particular, a filing error is detected when a trailing edge sensor 15th the bow 7th does not recognize at predetermined times and / or when the angle difference (in particular the machine angle as a state parameter of the printing machine for dynamic sheet deposit monitoring) or the distance between two consecutively falling immediately adjacent sheets 7th is too big or too small. The sensor signals can preferably are interpreted as a bow 7th that hangs firmly in the shaft (clamping arch) or as an arch 7th which is axially offset over one of the side edge stops 16 and / or trailing edge stops 14th is located (false sheet 7.1 or oblique arc 7.2 ). In a further development, provision is made for at least three trailing edge sensors over the width of the sheet 15th and / or preferably two trailing edge sensors arranged one after the other in the direction of sheet fall on both sides of the sheet 15th to use. This creates the possibility of the falling speed and / or the surface profile of the falling sheets 7th to determine. From these results, elements that influence the speed of fall, such as the fan of the blower frame, blower pipes, etc., can be specifically controlled and the bow fall can be changed in a targeted manner. Furthermore, paint deposits (pimples) can be avoided and the retraction movement of an auxiliary stacking table (e.g. non-stop roller blind) can be avoided 41 ) into the stacking area. Existing sensors, such as sensors for determining the stack height, the stack level, etc., can also be connected to the evaluation or control device, and their signals can be integrated into the results. Specific quality problems, such as the formation of corners, for example on the trailing edge of the sheet, can be detected through targeted sensor evaluation. The quality deficiency can then be eliminated by increasing the blowing pressure of the corner blowers. Defects can be remedied in particular by notifying the printer or automatically by the machine. Such a sensor arrangement can also be used in a sheet side edge, so that the possibility of influencing the sheet deposit can be further improved. A sheet position sensor can also be located above the delivery stack 9 be arranged to determine the surface profile of the falling arch 7th .

The 15th shows a further sensor 40 below the trailing edge sensor 15th , for example as a stack gap sensor 40 for controlling a non-stop roller blind 41 is provided in an arc gap. The one from this stack gap sensor 40 The sensor signals or data supplied can in particular by the evaluation or control device, for example the machine control, with the sensor signals or data from the trailing edge sensor or sensors 15th linked. A joint evaluation of the sensor signals or data can be carried out by the evaluation or control device. A check, for example for plausibility, can thereby be carried out by the evaluation or control device. Furthermore, the achievable accuracy of the determination of the position of sheet edges by the plurality of sensors 15th , 40 increase. The additional sensors can be used to check whether the non-stop roller blind is retracted 41 can be carried out without any problems. The intermediate space between two successively falling sheets can be developed further in the detection 7th be noted to arc control, such as the non-stop roller blind 41 , Sheet gripper, sheet vacuum cleaner, sheet blower defined in the determined space in the stack floor plan 9.1 to move into it. There is preferably the possibility of realizing the most favorable entry point using appropriate software. In a further development, sheet counting by the at least one sensor could also be used 15th , 40 be performed.

The evaluation or control device can evaluate the sensor signals, for example, in such a way that angle values (in particular the machine angle as state parameters of the printing machine for dynamic sheet deposit monitoring) are determined when a respective sheet 7th a sensor beam 15.1 a trailing edge sensor 15th happens. Setpoint values can be stored in the evaluation or control device, for example as angle values, which can be entered, automatically generated or learned. These target values can be stored depending on the processing speed, sheet format, blowing pressure of the blowing frame, etc. Does the one from the evaluation or control device differ from that from the trailing edge sensor? 15th The generated sensor signal determines angular values from the target value, possibly taking into account tolerances, can indicate a sheet that has been incorrectly deposited 7th (Slip sheet, false sheet 7.1 , Oblique arc 7.2 , Clamping bend) are closed. If there is a bow 7th not properly between the side edge stops 16 or side kickers 16 are located, the trailing edges of the sheet pass the sensor beams 15.1 the trailing edge sensors 15th especially at different machine angles.

Through further sensors 15th , 17th , 25th , 26th , 30th and / or further evaluation of sensor signals, the error case can be limited or determined. Suitable machine functions can be initiated depending on the detected error. Also from the stack gap sensor 40 The position of the sheet can be determined using the sensor signals supplied, after which it can be decided whether the non-stop roller blind 41 can enter the bow fall area unhindered. This in particular prevents the non-stop roller blind 41 collides with a trailing edge of the sheet when entering. All sensors can provide further training 15th , 17th , 25th , 26th , 30th to improve the function regularly cleaned, especially by means of blown air. This can be done individually or regularly, for example when changing stacks or actuating the delivery flap.

The 16 shows a stack floor plan 9.1 of a delivery pile 9 with possible monitoring areas. In this case, sensors arranged in the display (not shown further) can be used 25th , 26th , 30th a leading edge monitoring area 12.3 monitor which one through the leading edge stop faces 12.1 the leading edge stops 12th spanned leading edge stop level 12.2 in sheet transport direction 39 is downstream. At the same time, side edge sensors 17th Side edge monitoring areas 16.3 monitor which of each one passes through the side edge stop faces 16.1 the side edge stops 16 spanned side edge stop level 16.2 in the direction of the stacked floor plan 9.1 extend. Alternatively or additionally, the areas outside of the stack outline can also be used 9.1 on incorrectly filed sheets 7th be monitored. Alternatively or additionally, trailing edge sensors can be used at the same time 15th a trailing edge monitoring area 14.3 monitor which one through the trailing edge stop faces 14.1 the trailing edge stops 14th spanned trailing edge stop level 14.2 in sheet transport direction 39 is downstream.

List of reference symbols

1

Printing cylinder

2

Drive sprocket

3

Deflection sprocket

4th

wave

5

wave

6th

Chain

7th

arc

7.1

False sheet

7.2

Oblique bow

8th

Grab trolley

8.1

Gripper carriage level

9

Display pile

9.1

Stack floor plan

10

Stacking plate

11

Lifting chain

12th

Leading edge stop

12.1

Leading edge stop surface

12.2

Leading edge stop level

12.3

Leading edge monitoring area

13th

Braking unit

13.1

Suction belt

14th

Trailing edge stop

14.1

Trailing edge stop surface

14.2

Trailing edge stop level

14.3

Trailing edge monitoring area

15th

Trailing edge sensor

15.1

Sensor beam

15.2

monitored point

16

Side edge stop, side jogger

16.1

Side edge stop surface

16.2

Side edge stop level

16.3

Side edge monitoring area

17th

Side edge sensor

17.1

Sensor beam

17.2

monitored point

18th

Sheet guide plate

19th

dryer

20th

Pollination unit

22nd

Chain guide

23

holder

24

Registration unit

25th

Scanning sensor

25.1

Sensor / receiver

25.2

reflector

25.3

Sensor beam

25.4

monitored point

26th

Scanning sensor

26.1

Sensor / receiver

26.2

reflector

26.3

Sensor beam

26.4

monitored point

27

minimal sheet format

28

Intersection of the gripper carriage level and the stop level

29

further registration unit

30th

another scanning sensor

30.1

Transmitter-receiver

30.2

reflector

30.3

Sensor beam

30.4

monitored point

31

Cleaning unit

32

Nozzle unit

32.1

first outlet

32.2

second outlet opening

33

Blown air supply

34

Blown air jet

35

Blown air jet

36

Lattice structure

37

Sample sheet finger

38

Machine center

39

Sheet transport direction

40

Stack gap sensor

41

Non-stop roller blind

Claims (10)

Delivery for a sheet processing machine with a sheet conveyor system for conveying and releasing sheets (7) above a delivery stack (9), with at least one stop (12, 14, 16) for aligning the falling sheets (7) forming the delivery stack (9) is provided and at least one sensor (15, 17, 25, 26, 30) is provided for monitoring the position of at least one sheet (7) with respect to the stop (12, 14, 16), characterized in that the sensor (15, 17, 25, 26, 30) is designed to monitor a point (17.2, 15.2) located within the stack outline (9.1) and that the sensor (15, 17, 25, 26, 30) for detecting the sheet fall of one or more the following falling arch (7) is formed within the stack outline (9.1). Delivery at least according to the preceding claim, characterized in that at least two sensors (15, 17, 25, 26, 30) arranged on opposite sides with respect to the delivery stack (9) are designed for joint detection of the sheet fall. Display according to at least one of the preceding claims, characterized in that the at least one sensor (15, 17, 25, 26, 30) is provided for monitoring the position of the sheet side edges with respect to a side edge stop (16). Display according to at least one of the preceding claims, characterized in that the sensor (15, 17) has a stop plane (12.2, 14.2, 16.2) below a common line of intersection (28) of a gripper carriage plane (8.1) and the stop plane (12.2, 14.2, 16.2 ) cutting sensor beam (15.1, 17.1) is arranged generating. Display according to at least one of the preceding claims, characterized in that the sensor (15, 17) is arranged to generate a sensor beam (15.1, 17.1) which intersects the stack outline (9.1). Delivery according to at least one of the preceding claims, characterized in that the sensor (15, 17, 25, 26, 30) is connected to an evaluation or control device, which data is available about the sheet transport. Method for depositing sheets (7) in the delivery of a sheet processing machine, with at least one stop (12, 14, 16) aligning falling sheets (7) forming a delivery stack (9) and with at least one sensor (15, 17, 25 , 26, 30) monitors the position of at least one sheet (7) with respect to the stop (12, 14, 16), characterized in that at least one point (17.2, 15.2 ) is monitored within the stack outline (9.1), with several consecutive falling sheets (7) being detected. Method at least according to the preceding method claim, characterized in that a sensor signal is output when a falling sheet (7) is detected. Method according to at least one of the preceding method claims, characterized in that a sensor signal of a respective sheet (7) is evaluated in relation to a target value and a machine function is initiated when a tolerance limit is exceeded. Method according to at least one of the preceding method claims, characterized in that a sensor signal of a respective sheet (7) is evaluated in relation to a target value and a machine stop is initiated when a tolerance limit is exceeded.

Images