JP4227905B2 - Folding device and folding cylinder of printing machine - Google Patents

Description

  The present invention relates to a folding apparatus and a folding cylinder for a printing press, in which a web cut by a saw cylinder is fed between a pair of folding rollers by a folding blade to form a signature.

11 and 12 are diagrams showing a conventional example of a folding device used in a newspaper offset rotary press, FIG. 11 is a schematic diagram showing the overall configuration, and FIG. 12 is a main part (saw cylinder and folding cylinder). It is a schematic diagram which shows.
The folding device is configured as shown in FIG. 11, and the printed web 5 is continuously carried from a printing device (not shown) in the previous process, guided by the drag roller 1, and then the entrance of the folding machine. Folded in half along the longitudinal direction (web running direction) by the triangular plate 2 provided in the section. Next, the folded web 5 is sandwiched between the lead-in rollers 3 and 3 and the nipping rollers 4 and 4 disposed below and transferred by the rotation of these rollers 3, 3, 4 and 4. Then, it is fed between the saw cylinder 7 and the folding cylinder 8.

  As shown in FIG. 12, on the outer peripheral surface of the saw barrel 7, two sets of saw platforms 72 incorporating saw blades 73 are provided on the same diameter of the saw barrel 7 (ie, 180 degrees out of phase). Each saw stand 72 is assembled to the saw cylinder 7 along the axial direction. On the other hand, two sets of saw blade receivers 81, needle devices 82 and folding blades 83 are provided on the outer peripheral surface of the folding cylinder 8 on the same diameter. The diameters of the saw cylinder 7 and the folding cylinder 8 are normally set equal to each other, and the saw blade 73 of the saw cylinder 7 and the saw blade receiver 81 of the folding cylinder 8 are synchronously rotated, that is, fixed. The positions are set so as to face each other on the traveling surface of the web 5 in a cycle.

The saw blade receiver 81 is provided on the outer peripheral surface of the folding cylinder 8 along the axial direction as a receiving member of the saw blade 73 of the saw cylinder 7, and is formed of an elastic body such as rubber. Each needle device 82 is fixed to the needle shaft 82a provided along the axial direction of the folding cylinder 8, a needle arm 82b having one end fixed to the needle shaft 82a, and the other end of the needle arm 82b. And a needle 82c.
The needle 82c is interlocked with the folding cylinder 8 via the needle shaft 82a, and enters and exits from the outer peripheral surface of the folding cylinder 8 periodically. That is, the needle 82c swings between a position where the tip of the needle 82c protrudes toward the saw cylinder 7 from the traveling surface of the web 5 and a position where the needle 82c retracts from the web traveling surface into the folding cylinder 8. In the protruding position, the blade is pierced immediately upstream of the cut portion of the web 5 that is sandwiched and cut by the saw blade 73 and the saw blade receiver 81 (the front end portion of the web 5).

The folding blade 83 includes a folding shaft 83 a incorporated in the folding cylinder 8 and a blade body 83 b protruding from the folding shaft 83 a. The folding blade 83 enters and exits from the folding cylinder 8 according to the rotational phase of the folding cylinder 8. It is supposed to be. When the folding blade 83 approaches the folding rollers 10 and 10, the folding blade 83 protrudes from the peripheral surface of the folding cylinder 8 and pushes the web 5 between the folding rollers 10 and 10.
With such a configuration, the web 5 is first cut in the width direction between the cylinders 7 and 8 by the saw blade 73 and the saw blade receiver 81, and the folding cylinder 8 is immediately upstream of the cutting portion. The needle 82c of the needle device 82 is pierced and conveyed so as to be wound around the outer peripheral surface of the folding cylinder 8. Then, as the folding cylinder 8 further rotates and the intermediate portion between the leading end of the web 5 and the next cutting portion approaches the position immediately above the folding rollers 10, 10, the needle 82c is retracted from the web running surface. So I gradually get out of the web 5.

When the folding rollers 10, 10 and the folding blade 83 face each other on the web running surface, the web 5 is pushed between the folding rollers 10, 10 by the folding blade 83 while being guided by the guides 9, 9. At this time, the upstream side of the web 5 (the nip side of the barrels 7 and 8) is cut by the saw blade 73 and the saw blade receiver 81.
The web 5 pushed by the folding blade 83 is nipped by the folding rollers 10 and 10, is transversely folded at right angles to the web flow direction, and the impeller 11 rotates as a signature 6 in conjunction with the cylinders 7 and 8. It is transferred to. After the signature 6 is received between the blades 11 a of the impeller 11, the signature 6 is transferred to the lower discharge conveyor 12 according to the rotation of the impeller 11.

However, in the above-described prior art, as shown in FIG. 13, during high speed operation, the web 5 is formed with a buckling 5 a downstream of the folding roller 10 in the folding cylinder rotation direction. May be sent between the folding rollers 10 and 10, and unnecessary folding (hereinafter referred to as end folding) may occur in the signature.
As described above, the buckling 5a occurs in the web 5 at the downstream side in the folding cylinder rotation direction with respect to the folding roller 10 during the high speed operation. It is presumed to be caused by the close contact. That is, in FIG. 13, the web 5 is drawn in the direction indicated by the arrow A1 by the folding roller 10 on the downstream side in the folding cylinder rotation direction from the folding roller 10, and is in close contact with the peripheral surface of the folding cylinder 8 by the arrow A2. Since the web 5 is pulled in the direction shown, it is assumed that the web 5 is not smoothly moved from the folding cylinder 8 to the folding roller 10 and that the web 5 is buckled. Alternatively, a recess 8 a formed in the folding cylinder 8 to accommodate the folding blade 83 is sealed by a web 5 that is in close contact with the peripheral surface of the folding cylinder 8, and in the sealed recess 8 a, opposite to the folding cylinder 8. It is presumed that turbulent air flow is generated by the rotating folding blade 83 and the buckling 5a is caused by this turbulent flow.

Further, as shown in FIG. 14, immediately before both end portions 200a and 200b of the web 5 enter between the folding rollers 10 and 10, the both end portions 200a and 200b of the web 5 flutter and collide with each other. Even if it is pulled in between 10, end breakage may occur.
As described above, the end folding of the web 5 is caused by the behavior of the web 5 before being folded between the folding rollers 10 and 10 being unstable.

In Patent Document 1, a plurality of rows of air nozzles for air blowing upward are arranged between a pair of folding rollers, and the edge bending behavior of the web is controlled by adjusting the air blowing pressure in accordance with the printing operation speed, building page or paper quality, etc. Techniques for suppression are disclosed.
Japanese Patent Laid-Open No. 2003-238028

However, Patent Document 1 does not disclose a specific adjustment method for adjusting the air blow pressure with respect to the printing operation speed, building pages, paper quality, or the like. However, it is not possible to reliably stabilize the behavior of the web and prevent the occurrence of edge breakage.
The present invention was devised in view of the above-described problems, and includes a folding device for a printing press capable of reliably stabilizing the behavior of a web even during high-speed operation of the printing press and preventing the occurrence of end folding. The purpose is to provide a folding cylinder.

Therefore, the folding device of the printing press according to the first aspect of the present invention includes a pair of folding rollers that rotate in contact with each other and fold a web at the contact portion to form a signature, and the contact portion. Air jetting means for jetting air from below the web end portion in the middle of folding into the web end portion, an air supply source for supplying air to the air jetting means, and jetted from the air jetting means In order to control the amount of air supplied from the air supply source to the air ejecting means so that the pressure of the air increases as the printing operation speed increases, the air pressure increases as the printing operation speed increases. A storage unit that stores a map in which a target pressure of the air jetting unit is set corresponding to the printing operation speed, and the printing operation speed with reference to the map stored in the storage unit. It includes a controller and a calculator for calculating the target pressure to respond, and changing means for forcibly changing the target pressure calculated by the arithmetic unit, the control device, usually the operation The air supply amount is controlled so as to be the target pressure calculated by the unit. When the target pressure is forcibly changed by the changing unit, the target pressure is forcibly changed by the changing unit. The above-mentioned air supply amount is controlled .

According to a second aspect of the present invention, there is provided the folding apparatus for a printing press according to the first aspect of the present invention, wherein the map stored in the storage unit becomes higher as the printing operation speed becomes higher, and The target pressure of the air ejection means is set corresponding to the printing operation speed and the building page so as to increase as the building page decreases, and the calculation unit is stored in the storage unit. by referring to a map calculates the target pressure corresponding to the printing operation speed and the Kenpeji, the control device, the pressure of the air ejected from the upper Symbol air injection means, the printing operation speed increases The air supply amount is controlled so as to increase as the number of building pages decreases and as the building number decreases.
A folding device for a printing press according to a third aspect of the present invention is the printer according to the first or second aspect, wherein the changing means is an input device to which the target pressure is directly input, and the target pressure is directly input. Thus, the target pressure calculated by the calculation unit is forcibly changed, the storage unit stores the directly input target pressure, and the calculation unit is stored and accumulated in the storage unit. The target pressure is averaged periodically, and the averaged target pressure is reflected in the map.
A folding apparatus for a printing press according to a fourth aspect of the present invention is the apparatus according to the third aspect, wherein the changing means determines whether or not the average processed target pressure is reflected in the map via the changing means. It is configured to be determinable.
A folding apparatus for a printing press according to a fifth aspect of the present invention is the apparatus according to any one of the first to fourth aspects, wherein a roller is provided on at least one surface of the pair of folding rollers in a circumferential direction. A plurality of grooves formed side by side in the axial direction are provided, and the air ejection means is configured to eject air from the grooves toward the web end.

The folding apparatus for a printing press according to a sixth aspect of the present invention is the apparatus according to any one of the first to fifth aspects, wherein the target pressure is continuously increased as the printing operation speed increases. It is set so that it becomes.
A folding device for a printing press according to a seventh aspect of the present invention is the printer according to any one of the first to fifth aspects, wherein the target pressure is increased stepwise as the printing operation speed increases. It is set so that it becomes.

The folding apparatus for a printing press according to an eighth aspect of the present invention is the apparatus according to any one of the first to seventh aspects, wherein the map is prepared for each paper type of the web, and the calculation unit includes The target pressure is calculated with reference to a map corresponding to the paper type of the web.
A folding device for a printing press according to a ninth aspect of the present invention is the apparatus according to any one of the first to eighth aspects, wherein the folding device is provided in a pipe for supplying air from the air supply source to the air ejection means. And a control valve capable of continuously changing the opening degree, and a pressure detecting means for detecting the pressure of the air ejected from the air ejecting means, the control device comprising a pressure detected by the pressure detecting means. Is characterized in that the opening degree of the control valve is adjusted so that becomes the target pressure.

A printer folding apparatus according to a tenth aspect of the present invention is the apparatus according to any one of the first to eighth aspects, wherein a plurality of pipes for supplying air from the air supply source to the air ejection means. And a control valve capable of switching the opening degree to fully open or fully closed, and a pressure detection means for detecting the pressure of the air ejected from the air ejection means. The openings of the plurality of control valves are switched so that the detected pressure becomes the target pressure.

Folding cylinder according to claim 1 1 printing machine of the invention described is a folding drum to form a signature by feeding the web to the Taise' portions of the pair of folding rollers rotating in contact pairs from one another, of the folding cylinder A recess formed in a peripheral surface, and a recess provided on the recess, which rotates in a direction opposite to the rotation direction of the folding cylinder and protrudes outward in the circumferential direction as it approaches the contact portion, thereby bringing the web into contact A folding blade that is pushed into a part, provided on the downstream side in the folding cylinder rotation direction with respect to the recess on the circumferential surface, can be stored in the circumferential surface, and with an increase in centrifugal force due to the rotation of the folding cylinder And a movable member that can project outward.

Folding cylinder according to claim 1 2 printing press of the present invention described, in the structure of claim 1 1, wherein said movable member is a plate spring member provided so as to substantially along the circumferential direction of the folding cylinder, The downstream end of the leaf spring member in the folding cylinder rotation direction is fixed to the circumferential surface, and the upstream end of the leaf spring member in the folding cylinder rotation direction extends to a position close to the recess. It is characterized by having a weight.

Folding cylinder of a printing machine of the present invention according to claim 1 3, wherein, in the structure according to claim 1 1 or 1 2, wherein said movable member is formed in a strip that is continuous along the axial direction of the folding cylinder It is characterized by that.
Folding cylinder according to claim 1 4 printing machine of the present invention described, in the structure according to claim 1 1 or 1 2, wherein said movable member is provided intermittently at predetermined intervals in the axial direction of the folding cylinder It is characterized by being.

Folding apparatus of claims 1-5 printing machine of the present invention described is characterized in that is provided with a folding cylinder according to any one of the preceding claims 1 1 to 1 4.
A folding cylinder of a printing press according to the present invention described in claim 16 is a folding cylinder that forms a signature by feeding a web to a contact portion of a pair of folding rollers that rotate in contact with each other. A recess formed in a peripheral surface, and a recess provided on the recess, which rotates in a direction opposite to the rotation direction of the folding cylinder and protrudes outward in the circumferential direction as it approaches the contact portion, thereby bringing the web into contact A folding blade to be pushed into the part, a convex part projecting toward the outer circumferential direction on the downstream side in the folding cylinder rotation direction from the recess on the circumferential surface, and a downstream side in the folding cylinder rotation direction from the convex part on the circumferential surface And a movable member that can be stored in the peripheral surface and that can protrude outward from the convex portion with an increase in centrifugal force due to the rotation of the folding cylinder. It is a feature.

The folding cylinder of the printing machine of the present invention according to claim 17 is the configuration according to claim 16 , wherein the movable member is a leaf spring member provided so as to be substantially along the circumferential direction of the folding cylinder, The downstream end of the leaf spring member in the folding cylinder rotation direction is fixed to the peripheral surface, and the upstream end of the leaf spring member in the folding cylinder rotation direction extends to a position close to the convex portion. It is also characterized by having a weight.

The folding cylinder of the printing press of the present invention according to claim 18 is the configuration according to claim 16 or 17 , wherein the movable member is formed in a continuous belt shape along the axial direction of the folding cylinder. It is characterized by that.
Folding cylinder of the printing press of the present invention of claim 19, wherein, in the structure according to claim 1 6 or 1 7, wherein said movable member is provided intermittently at predetermined intervals in the axial direction of the folding cylinder It is characterized by having.

Band folding cylinder according to claim 2 0 Printing machine of the present invention described, in the structure according to any one of claims 1 6-19, where the convex portion is continuous along the axial direction of the folding cylinder It is characterized by being formed.
Folding cylinder according to claim 2 1 printing machine of the invention described is opened in the configuration according to any one of claims 1 6-19, the convex portion, the predetermined interval in the axial direction of the folding cylinder It is characterized by being provided intermittently.

A folding device for a printing press according to a second aspect of the present invention includes the folding cylinder according to any one of the first to sixth aspects.
Folding cylinder according to claim 2 3 printing machine of the invention described is a folding drum to form a signature by feeding the web to the Taise' portions of the pair of folding rollers rotating in contact pairs from one another, of the folding cylinder A recess formed on the peripheral surface, and a recess that is retractable, and rotates in a direction opposite to the rotation direction of the folding cylinder and protrudes in the outer circumferential direction as it approaches the contact portion. A folding blade that is pushed into the contact portion, and a projection that is provided upstream of the folding blade in the folding blade rotation direction and that protrudes in the circumferential direction as the folding blade is stored in the recess. It is said.

A folding cylinder of a printing press according to a twenty- fourth aspect of the present invention is the folding cylinder according to the twenty- third aspect , wherein the folding blade includes a rotating shaft and a blade body protruding from the rotating shaft. The protrusion is characterized in that it is attached at a position upstream of the blade shaft in the folding shaft rotation direction on the rotating shaft and close to the protrusion position.

A folding cylinder of a printing press according to a twenty- fifth aspect of the present invention is the printing cylinder according to the twenty- fourth aspect , wherein the surface of the blade body and the surface of the protruding portion upstream of the folding blade rotating direction are smoothly connected. It is characterized by being.
Folding cylinder according to claim 2 6 printing machine of the present invention described, in the structure according to any one of claims 2 3-2 5, the folding blade rotation direction intermediate portion of the protrusion, formed in a curved shape It is characterized by being.

Folding apparatus according to claim 2 7 printing machine of the invention described is characterized in that is provided with a folding cylinder according to any one of the preceding claims 2 3-2 6.

According to the folding device of the printing press of the present invention (Claims 1 to 10 ), since the air supply amount from the air supply source to the air ejection means is controlled so as to increase as the printing operation speed increases, Even during high-speed operation of the printing press, the behavior of the web can be reliably stabilized and the occurrence of edge breakage can be prevented.
In particular, in addition to the control according to the printing operation speed described above, if the amount of air supplied from the air supply source to the air jetting unit is controlled so as to increase as the number of building pages decreases, the web behavior can be further stabilized. Therefore, it is possible to more reliably prevent the occurrence of edge breakage (claim 2).

According to the folding device and the folding cylinder (claims 1 1 to 2 7 ) of the printing press according to the present invention, the inside of the recess is not sealed by the web. By suppressing the flow, the behavior of the web can be reliably stabilized, and the occurrence of edge breakage can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(A) First Embodiment FIGS. 1 to 3 are diagrams for explaining a folding device according to a first embodiment of the present invention. FIG. 1 is a schematic diagram showing the configuration, and FIG. a plan view a ₁ direction arrow view of FIG. 1, FIG. 3 is a diagram showing a map stored in the storage unit. 1 to 3, the same reference numerals are used for the same portions or members as those of the conventional example described above. In FIG. 2, the beam 13, the arm 13a, and the signature guide 13b are omitted.

In the folding device according to the present embodiment, the web 5 continuously carried in from the printing device (not shown) in the previous process is folded in half along the vertical direction (web traveling direction) by a triangular plate, and a lead-in roller, a nipping roller, Is fed between the saw cylinder 7 and the folding cylinder 8.
As shown in FIG. 1, two sets of saw bases 72 incorporating saw blades 73 are provided on the outer peripheral surface of the saw barrel 7 on the same diameter of the saw barrel 7 (ie, 180 degrees out of phase). Each saw stand 72 is assembled to the saw cylinder 7 along the axial direction. On the other hand, two sets of saw blade receivers 81, needle devices 82 and folding blades 83 are provided on the outer peripheral surface of the folding cylinder 8 on the same diameter. The diameters of the saw cylinder 7 and the folding cylinder 8 are normally set equal to each other, and the saw blade 73 of the saw cylinder 7 and the saw blade receiver 81 of the folding cylinder 8 are synchronously rotated, that is, fixed. The positions are set so as to face each other on the traveling surface of the web 5 in a cycle.

The saw blade receiver 81 is provided on the outer peripheral surface of the folding cylinder 8 along the axial direction as a receiving member of the saw blade 73 of the saw cylinder 7, and is formed of an elastic body such as rubber. Each needle device 82 is fixed to the needle shaft 82a provided along the axial direction of the folding cylinder 8, a needle arm 82b having one end fixed to the needle shaft 82a, and the other end of the needle arm 82b. And a needle 82c.
The needle 82c is interlocked with the folding cylinder 8 via the needle shaft 82a, and enters and exits from the outer peripheral surface of the folding cylinder 8 periodically. That is, the needle 82c swings between a position where the tip of the needle 82c protrudes toward the saw cylinder 7 from the traveling surface of the web 5 and a position where the needle 82c retracts from the web traveling surface into the folding cylinder 8. In the protruding position, the blade is pierced immediately upstream of the cut portion of the web 5 that is sandwiched and cut by the saw blade 73 and the saw blade receiver 81 (the front end portion of the web 5).

The folding blade 83 includes a folding shaft 83 a incorporated in the folding cylinder 8 and a blade body 83 b protruding from the folding shaft 83 a. The folding blade 83 enters and exits from the folding cylinder 8 according to the rotational phase of the folding cylinder 8. It is supposed to be. When the folding blade 83 approaches the folding rollers 10 and 10, the folding blade 83 protrudes from the peripheral surface of the folding cylinder 8 and pushes the web 5 between the folding rollers 10 and 10.
As a result, the web 5 is first cut in the width direction between the cylinders 7 and 8 by the saw blade 73 and the saw blade receiver 81, and the needle device 82 of the folding cylinder 8 is immediately upstream of the cutting portion. The needle 82c is pierced and conveyed so as to be wound around the outer peripheral surface of the folding cylinder 8. Then, as the folding cylinder 8 further rotates and the intermediate portion between the leading end of the web 5 and the next cutting portion approaches the position immediately above the folding rollers 10, 10, the needle 82c is retracted from the web running surface. So I gradually get out of the web 5.

When the folding rollers 10, 10 and the folding blade 83 face each other on the web running surface, the web 5 is pushed between the folding rollers 10, 10 by the folding blade 83 while being guided by the guides 9, 9. At this time, the upstream side of the web 5 (the nip side of the barrels 7 and 8) is cut by the saw blade 73 and the saw blade receiver 81.
The web 5 pushed in by the folding blade 83 is sandwiched between folding rollers 10 and 10, is transversely folded at right angles to the web flow direction, and rotates as a signature 6 in conjunction with the cylinders 7 and 8. It is transferred to the subsequent process via a car.

  As described above, the main folding apparatus is provided with the folding rollers 10 and 10 that are in contact with each other and rotate synchronously with the folding cylinder 8 below the folding cylinder 8. On the peripheral surface of the folding roller upstream of the folding cylinder rotation direction (left folding roller in FIG. 1), a plurality of grooves 10a are formed in the circumferential direction and in the roller axial direction as shown in FIG. ing. Furthermore, as shown in FIG. 1, an arm 13a is fixedly provided at each position below the folding roller 10 and corresponding to the plurality of groove portions 10a. These arms 13a are attached to beams 13 that are stretched in the roller axial direction. A signature guide 13b for guiding the travel of the signature 6 is provided below the contact portion of the folding rollers 10 and 10, and this signature guide 13b is fixed to each arm 13a. Yes.

Furthermore, an air nozzle (air ejection means) 15 for ejecting air from the tip is attached to each arm 13a. The front end portion of the air nozzle 15 is disposed in the groove portion 10 a in the vicinity of the contact portion of the folding rollers 10, 10, so that air is ejected upwardly from the contact portion of the folding rollers 10, 10.
In addition, an air supply source 21 such as a compressor for supplying air to the air nozzle 15 is provided, and the air from the air supply source 21 is supplied to the air nozzle 15 via the pipe 14. The pipe 14 is provided with a control valve (for example, electropneumatic converter) 27 whose opening degree can be continuously changed, and an air header 16 is provided on the air nozzle 15 side of the control valve 27. A pressure detector (pressure detection means) 16 is connected to the air header 16 so that the air pressure on the air nozzle 15 side of the control valve 27 of the pipe 14, that is, the pressure of the air ejected from the air nozzle 15 can be detected. It is like that.

Further, the main folding device is provided with a valve driving device 22 for driving the control valve 27 and a control device 18 for controlling the valve driving device 22 to adjust the opening degree of the control valve 27. The control device 18 is, for example, a computer, and includes a storage unit 19 such as a ROM and a RAM, and an arithmetic unit 20 such as a CPU.
As shown in FIG. 3, the storage unit 19 has a target pressure of the air nozzle 15 (a target pressure of air ejected from the air nozzle 15) corresponding to the printing operation speed so as to increase as the printing operation speed increases. The set map is stored in advance. Further, even at the same printing operation speed, the target pressure of the air nozzle 15 corresponds to the building page so that it increases as the building page (for example, the total number of pages when the web 5 is newspaper) decreases. Is set. For example, three lines indicated by a, b, and c in FIG. 3 are lines corresponding to the type of building page (number of pages), and there are many building pages in the order a, b, and c. In the present embodiment, the target pressure is set so as to increase continuously as the printing operation speed increases, that is, as shown by these lines a, b, c. However, for example, the printing operation speed may be set so as to increase stepwise as the printing operation speed increases. Moreover, the said map is each prepared for every paper type (for example, basic weight, a used paper mixing degree, etc.) of the web 5. FIG. Such a map is created based on data obtained by experiments or simulations in advance, but can be arbitrarily set.

  The computing unit 20 first selects a map corresponding to the paper type based on the printing operation speed, building page, and paper type information in the current printing sent from the upstream process, and then selects the map corresponding to the selected map from the selected map. The printing operation speed and the target pressure corresponding to the building page are calculated. And the control apparatus 18 controls the valve drive device 22 and adjusts the opening degree of the control valve 27 so that the air pressure of the air nozzle 15 becomes the target pressure calculated by the calculating part 20. In this case, the opening degree of the control valve 27 corresponding to the target pressure may be set in advance and adjusted so as to become this opening degree. In addition, pressure information from the pressure detector 26 is acquired, The opening of the control valve 27 may be adjusted (feedback control) so that the pressure detected by the detector 26 approaches the target pressure.

  Further, an input device (changing means) 25 is connected to the control device 18, and the target pressure can be directly input from the input device 25 and set. That is, normally, the target pressure is calculated by the calculation unit 20, but this can be forcibly changed to a desired target pressure. When the target pressure is forcibly changed in this way, the control device 18 adjusts the opening degree of the control valve 27 so that the air pressure of the air nozzle 15 becomes the input target pressure. Yes. Further, the target pressure data input via the input device 25 in this way is stored in the storage unit 19 in association with the printing operation speed, building page, and paper type at that time. Further, the arithmetic unit 20 periodically averages the data stored and accumulated in the storage unit 19 (that is, the target pressure input via the input device 25), and reflects the averaged data in the map. You can also do that. This makes it possible to create a map suitable for the folding device currently used. Note that the determination as to whether or not the average processed data is reflected on the map can also be made via the input device 25.

Since the folding device as the first embodiment of the present invention is configured as described above, the folding device increases as the printing operation speed increases, and increases as the number of building pages decreases. The amount of air supplied from the air supply source 21 to the air nozzle 15 is controlled.
That is, normally, as the printing operation speed increases, the behavior of the web 5 becomes unstable and edge breakage is likely to occur. However, in the main folding apparatus, the air supply amount increases as the printing operation speed increases. Therefore, the behavior of the web 5 can be reliably stabilized even at a high speed, and the occurrence of edge breakage can be prevented. Further, as the number of building pages decreases, the behavior of the web 5 becomes unstable and end-breaking is likely to occur. However, in this folding apparatus, in addition to the control according to the printing operation speed, the number of building pages decreases. Since the air supply amount is increased, the behavior of the web 5 can be further stabilized and the occurrence of edge breakage can be prevented.

  FIG. 4 is a schematic diagram showing a folding device as a first modification of the present embodiment. In this embodiment, one set of the control valve 27 and the air supply source 21 is provided, but a plurality of sets of the control valve 27 and the air supply source 21 may be provided as shown in FIG. Here, a configuration is shown in which three air supply sources 21a, 21b, and 21c and control valves 27a, 27b, and 27c for controlling the air supply amounts from these air supply sources 21a, 21b, and 21c are provided. However, the present invention is not limited to this. When configured in this way, the opening degree of each control valve 27a, 27b, 27c may be controlled simultaneously based on the map, or when the target pressure is low, the control valves 27b, 27c are fully closed. Alternatively, the air supply amount may be adjusted only by the control valve 27a, and the opening degree of the control valves 27b and 27c may be adjusted in order as the target pressure increases. Further, the control valves 27a, 27b, and 27c are electromagnetic valves (remote operation switching valves) whose opening degree can be switched to full open or full close, and the control valves 27a, 27b, and 27c are fully opened in order as the target pressure increases. It may be. Such a configuration using an electromagnetic valve is suitable when using a map in which the target pressure increases stepwise as the printing operation speed increases.

  FIG. 5 is a schematic diagram showing a folding device as a second modification of the present embodiment. As shown in FIG. 5, a groove 10a is also formed in the folding roller 10 on the downstream side in the folding cylinder rotation direction, and the pipe 14, the air nozzle 15, the air header 16, the pressure detector 26, the air supply source are formed as in this embodiment. 21, a control valve 27, and a valve driving device 22 may be provided to inject air from the two air nozzles 15 and 15.

(B) Second Embodiment FIGS. 6 and 7 are views for explaining a folding device as a second embodiment of the present invention. FIG. 6 is an enlarged view of a folding cylinder, and FIG. 7 is a configuration of the folding device. It is a schematic diagram which shows. 6 and 7, the same parts or members as those of the conventional example described above are indicated by the same reference numerals.

In the folding device according to the present embodiment, as shown in FIG. 12 used in the description of the prior art, the web 5 continuously carried in from the printing device (not shown) in the previous process is longitudinally (web traveling direction) by a triangular plate. And is fed between the saw cylinder 7 and the folding cylinder 8 by a lead-in roller, a nipping roller, or the like.
On the outer peripheral surface of the saw cylinder 7, two sets of saw tables 72 incorporating saw blades 73 are provided on the same diameter of the saw cylinder 7 (that is, 180 degrees out of phase). Are assembled to the saw cylinder 7 along the axial direction. On the other hand, two sets of saw blade receivers 81, needle devices 82 and folding blades 83 are provided on the outer peripheral surface of the folding cylinder 8 on the same diameter. The diameters of the saw cylinder 7 and the folding cylinder 8 are normally set equal to each other, and the saw blade 73 of the saw cylinder 7 and the saw blade receiver 81 of the folding cylinder 8 are synchronously rotated, that is, fixed. The positions are set so as to face each other on the traveling surface of the web 5 in a cycle.

The saw blade receiver 81 is provided on the outer peripheral surface of the folding cylinder 8 along the axial direction as a receiving member of the saw blade 73 of the saw cylinder 7, and is formed of an elastic body such as rubber. Each needle device 82 is fixed to the needle shaft 82a provided along the axial direction of the folding cylinder 8, a needle arm 82b having one end fixed to the needle shaft 82a, and the other end of the needle arm 82b. And a needle 82c.
The needle 82c is interlocked with the folding cylinder 8 via the needle shaft 82a, and enters and exits from the outer peripheral surface of the folding cylinder 8 periodically. That is, the needle 82c swings between a position where the tip of the needle 82c protrudes toward the saw cylinder 7 from the traveling surface of the web 5 and a position where the needle 82c retracts from the web traveling surface into the folding cylinder 8. In the protruding position, the blade is pierced immediately upstream of the cut portion of the web 5 that is sandwiched and cut by the saw blade 73 and the saw blade receiver 81 (the front end portion of the web 5).

The folding blade 83 includes a folding shaft 83 a incorporated in the folding cylinder 8 and a blade body 83 b protruding from the folding shaft 83 a. The folding blade 83 enters and exits from the folding cylinder 8 according to the rotational phase of the folding cylinder 8. It is supposed to be. When the folding blade 83 approaches the folding rollers 10 and 10, the folding blade 83 protrudes from the peripheral surface of the folding cylinder 8 and pushes the web 5 between the folding rollers 10 and 10.
As a result, the web 5 is first cut in the width direction between the cylinders 7 and 8 by the saw blade 73 and the saw blade receiver 81, and the needle device 82 of the folding cylinder 8 is immediately upstream of the cutting portion. The needle 82c is pierced and conveyed so as to be wound around the outer peripheral surface of the folding cylinder 8. Then, as the folding cylinder 8 further rotates and the intermediate portion between the leading end of the web 5 and the next cutting portion approaches the position immediately above the folding rollers 10, 10, the needle 82c is retracted from the web running surface. So I gradually get out of the web 5.

When the folding rollers 10, 10 and the folding blade 83 face each other on the web running surface, the web 5 is pushed between the folding rollers 10, 10 by the folding blade 83 while being guided by the guides 9, 9. At this time, the upstream side of the web 5 (the nip side of the barrels 7 and 8) is cut by the saw blade 73 and the saw blade receiver 81.
The web 5 pushed in by the folding blade 83 is sandwiched between folding rollers 10 and 10, is transversely folded at right angles to the web flow direction, and rotates as a signature 6 in conjunction with the cylinders 7 and 8. It is transferred to the subsequent process via a car.

  Now, the present folding device is characterized in the configuration of the folding cylinder 8 in the configuration described above. That is, as shown in FIG. 6, on the peripheral surface of the folding cylinder 8, the folding blade rotation direction downstream side of the folding blade 83, and the folding device rotation direction upstream of the recess 8 b of the needle device 82. A groove portion (recessed portion) 85c is formed in this region, and a leaf spring member (movable member) 85 that can be stored in the groove portion 85c is provided.

The upstream end of the groove 85c in the folding cylinder rotation direction extends to a position near the recess 8a of the folding blade 83.
The leaf spring member 85 is formed so as to be substantially along the circumferential direction of the folding cylinder 8, and here, it is formed in a continuous belt shape along the axial direction of the folding cylinder 8. The downstream end of the leaf spring member 85 in the folding cylinder rotation direction is fixed to the bottom of the groove 85c by a bolt 85b. The upstream end of the leaf spring member 85 in the folding cylinder rotation direction is fixed to the folding blade 83. It extends to a position close to the recess 8a. Furthermore, a weight 85 a is attached to the upstream end of the leaf spring member 85 in the folding cylinder rotation direction. Further, the leaf spring member 85 is accommodated in the groove 85c when the folding cylinder 8 stops rotating or rotates at a low speed.

  Since the folding device as the second embodiment of the present invention is configured as described above, the leaf spring member 85 is housed inside the groove 85c when the printing operation speed is low. Although the folding cylinder 8 does not go outward, the centrifugal force due to the rotation of the folding cylinder 8 increases as the printing operation speed increases, and the leaf spring member 85 comes out in the circumferential direction. For example, as shown in FIG. 7, when the printing operation speed is increased, the force of the leaf spring member 85 protruding from the inner periphery of the folding cylinder 8 in the outer peripheral direction to push the web 5 in the outer peripheral direction. Act on. The leaf spring member 85 is pushed into the groove 85 c by the tension of the web 5 while the tip of the web 5 is pulled by the needle device 82, but the upstream side of the web 5 is the saw blade 73 of the saw body 7. At the same time, the needle 82c of the needle device 82 is released from the web 5 and released from the tension of the web 5, and pushes the web 5 outward. Thereby, since a gap is formed between the peripheral surface of the folding cylinder 8 and the web 5, the web 5 can be prevented from coming into close contact with the peripheral surface of the folding cylinder 8. That is, since the inside of the recess 8 a is not sealed by the web 5, it is possible to suppress the turbulent air flow that has conventionally been generated by the rotation of the folding blade 83 and to reliably stabilize the behavior of the web 5. It becomes possible to prevent the occurrence of breakage.

In the present embodiment, the leaf spring member 85 is formed in a continuous belt shape along the axial direction of the folding cylinder 8. However, the present invention is not limited to this. For example, the leaf spring member 85 is axially aligned with the folding cylinder 8. May be provided intermittently at predetermined intervals.
8 and 9 are schematic views showing a folding device as a modification of the present embodiment. In this embodiment, the recess 82 of the folding blade 83 and the leaf spring member 85 are provided close to each other. However, as shown in FIGS. 8 and 9, the leaf spring member 85 and the folding blade 83 on the circumferential surface of the folding cylinder 8 are provided. You may provide the convex part 84 which protruded toward the circumferential direction between the recesses 8a. By providing the convex portion 84, a gap corresponding to the height of the convex portion 84 can always be formed between the circumferential surface of the folding cylinder 8 and the web 5. However, when the printing operation speed is increased, there is a possibility that a sufficient gap cannot be formed only by the convex portion 84 and the behavior of the web 5 cannot be stabilized. Therefore, the leaf spring member 85 protrudes outward from the convex portion 84 at a high speed, thereby forming a sufficient gap between the peripheral surface of the folding cylinder 8 and the web 5 even at a high printing operation speed. As in this embodiment, the behavior of the web 5 can be reliably stabilized, and the occurrence of edge breakage can be prevented. The convex portion 84 is formed in a continuous belt shape along the axial direction of the folding cylinder 8 similarly to the leaf spring member 85, or is provided intermittently with a predetermined interval in the axial direction of the folding cylinder 8. Also good.

(C) Third Embodiment FIGS. 10A and 10B are diagrams for explaining a folding device according to a third embodiment of the present invention. FIG. 10A is an enlarged view of a folding cylinder, and FIG. 10B is an enlarged view of a folding blade. It is. In FIG. 10, the same parts or members as those of the conventional example described above are indicated by the same reference numerals.

In the folding device according to the present embodiment, as shown in FIG. 12 used in the description of the prior art, the web 5 continuously carried in from the printing device (not shown) in the previous process is longitudinally (web traveling direction) by a triangular plate. And is fed between the saw cylinder 7 and the folding cylinder 8 by a lead-in roller, a nipping roller, or the like.
On the outer peripheral surface of the saw cylinder 7, two sets of saw tables 72 incorporating saw blades 73 are provided on the same diameter of the saw cylinder 7 (that is, 180 degrees out of phase). Are assembled to the saw cylinder 7 along the axial direction. On the other hand, two sets of saw blade receivers 81, needle devices 82 and folding blades 83 are provided on the outer peripheral surface of the folding cylinder 8 on the same diameter. The diameters of the saw cylinder 7 and the folding cylinder 8 are normally set equal to each other, and the saw blade 73 of the saw cylinder 7 and the saw blade receiver 81 of the folding cylinder 8 are synchronously rotated, that is, fixed. The positions are set so as to face each other on the traveling surface of the web 5 in a cycle.

The saw blade receiver 81 is provided on the outer peripheral surface of the folding cylinder 8 along the axial direction as a receiving member of the saw blade 73 of the saw cylinder 7, and is formed of an elastic body such as rubber. Each needle device 82 is fixed to the needle shaft 82a provided along the axial direction of the folding cylinder 8, a needle arm 82b having one end fixed to the needle shaft 82a, and the other end of the needle arm 82b. And a needle 82c.
The needle 82c is interlocked with the folding cylinder 8 via the needle shaft 82a, and enters and exits from the outer peripheral surface of the folding cylinder 8 periodically. That is, the needle 82c swings between a position where the tip of the needle 82c protrudes toward the saw cylinder 7 from the traveling surface of the web 5 and a position where the needle 82c retracts from the web traveling surface into the folding cylinder 8. In the protruding position, the blade is pierced immediately upstream of the cut portion of the web 5 that is sandwiched and cut by the saw blade 73 and the saw blade receiver 81 (the front end portion of the web 5).

The folding blade 83 includes a folding shaft 83 a incorporated in the folding cylinder 8 and a blade body 83 b protruding from the folding shaft 83 a. The folding blade 83 enters and exits from the folding cylinder 8 according to the rotational phase of the folding cylinder 8. It is supposed to be. When the folding blade 83 approaches the folding rollers 10 and 10, the folding blade 83 protrudes from the peripheral surface of the folding cylinder 8 and pushes the web 5 between the folding rollers 10 and 10.
As a result, the web 5 is first cut in the width direction between the cylinders 7 and 8 by the saw blade 73 and the saw blade receiver 81, and the needle device 82 of the folding cylinder 8 is immediately upstream of the cutting portion. The needle 82c is pierced and conveyed so as to be wound around the outer peripheral surface of the folding cylinder 8. Then, as the folding cylinder 8 further rotates and the intermediate portion between the leading end of the web 5 and the next cutting portion approaches the position immediately above the folding rollers 10, 10, the needle 82c is retracted from the web running surface. So I gradually get out of the web 5.

When the folding rollers 10, 10 and the folding blade 83 face each other on the web running surface, the web 5 is pushed between the folding rollers 10, 10 by the folding blade 83 while being guided by the guides 9, 9. At this time, the upstream side of the web 5 (the nip side of the barrels 7 and 8) is cut by the saw blade 73 and the saw blade receiver 81.
The web 5 pushed in by the folding blade 83 is sandwiched between folding rollers 10 and 10, is transversely folded at right angles to the web flow direction, and rotates as a signature 6 in conjunction with the cylinders 7 and 8. It is transferred to the subsequent process via a car.

  Now, the present folding device is characterized in the configuration of the folding cylinder 8 in the configuration described above. As shown in FIGS. 10 (a) and 10 (b), the folding shaft 83a is located upstream of the position where the blade body 83b protrudes and in the folding blade rotation direction, and close to the protruding position. A protrusion 100 is attached. The projecting portion 100 is provided so as to project in the outer circumferential direction of the folding shaft 83a, and protrudes in the outer circumferential direction as the folding blade 83 is stored in the recess 8a.

  Further, the protrusion 100 is formed at the surface 100a formed at the downstream end in the folding blade rotation direction, the surface 100c formed at the upstream end in the folding blade rotation direction, and an intermediate portion between these surfaces 100a and 100c. Surface 100b. The surface 100a of the protrusion 100 and the surface of the blade body 83b are formed so as to be smoothly connected, and the surface 100b of the protrusion 100 is formed in a curved shape, whereby the folding blade 83 is rotated. This has the effect of rectifying the air in the vicinity of the folding blade 83.

  Since the folding device as the third embodiment of the present invention is configured as described above, after the folding blade 83 protrudes in the outer circumferential direction of the folding cylinder 8 and pushes the web 5 between the folding rollers 10 and 10. As the protrusion 8 is stored in the recess 8 a, the protrusion 100 starts to protrude outward, the protrusion 100 pushes the web 5 outward in the periphery of the folding cylinder 8, and the web 5 comes into close contact with the peripheral surface of the folding cylinder 8. Acts not to. As a result, even when the printing operation speed is high, the recess 5a is prevented from being sealed by the web 5, and the turbulent air flow that has been generated by the rotation of the folding blade 83 is suppressed. The behavior can be reliably stabilized and the occurrence of edge breakage can be prevented.

It is a schematic diagram which shows the structure of the folding apparatus as 1st Embodiment of this invention. A plan view of the folding roller according to the first embodiment of the present invention, an A ₁ direction arrow view of FIG. It is a figure which shows the map memorize | stored in the memory | storage part which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the folding apparatus as the modification 1 of 1st Embodiment of this invention. It is a schematic diagram which shows the folding apparatus as the modification 2 of 1st Embodiment of this invention. It is a figure for demonstrating the folding apparatus as 2nd Embodiment of this invention, Comprising: It is a schematic diagram which shows the enlarged view of a folding cylinder. It is a schematic diagram which shows the structure of the folding apparatus as 2nd Embodiment of this invention. It is a figure for demonstrating the folding apparatus as a modification of 2nd Embodiment of this invention, Comprising: It is an enlarged view of a folding cylinder. It is a schematic diagram which shows the folding apparatus as a modification of 2nd Embodiment of this invention. It is a figure for demonstrating the folding apparatus as 3rd Embodiment of this invention, Comprising: (a) is an enlarged view of a folding cylinder, (b) is an enlarged view of a folding blade. It is a schematic diagram which shows the whole structure of the conventional folding apparatus. It is a schematic diagram which shows the principal part (a saw cylinder and a folding cylinder) of the conventional folding apparatus. It is a figure for demonstrating the subject of the conventional folding apparatus, Comprising: It is a schematic diagram which shows the principal part of a folding cylinder. It is a figure for demonstrating the subject of the conventional folding apparatus, Comprising: It is a schematic diagram which shows the principal part of a folding cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drag roller 2 Triangular plate 3 Lead-in roller 4 Nipping roller 5 Web 5a Buckling 6 Folding signature 7 Saw cylinder 8 Folding cylinder 8a, 8b Recess 9 Guide 10 Folding roller 11 Impeller 11a Blade 12 Discharge conveyor 13 Beam 13a Arm 13b Signature Guide 14 Piping 15 Air nozzle (Air ejecting means)
DESCRIPTION OF SYMBOLS 16 Pressure detector 18 Control apparatus 19 Memory | storage part 20 Calculation part 22 Valve drive device 25 Input device 26 Pressure detector 27, 27a, 27b, 27c Control valve 72 Saw stand 73 Saw blade 81 Saw blade receiver 82 Needle device 82a Needle shaft 82b Needle arm 82c Needle 83 Folding blade 83a Folding shaft 83b Blade body 84 Convex part 85 Leaf spring member (movable member)
85a Weight 85b Bolt 85c Groove (recess)
100 Protrusion 100a, 100b, 100c Protrusion surface 200a, 200b End of web

Claims (27)

A pair of folding rollers that rotate in contact with each other and fold the web at the contact portion to form a signature;
Air jetting means for jetting air from below the web end portion in the middle of being folded by the contact portion toward the web end portion;
An air supply source for supplying air to the air ejection means;
In order to control the amount of air supplied from the air supply source to the air ejecting means so that the pressure of the air ejected from the air ejecting means becomes higher as the printing operation speed becomes higher , the printing operation speed With reference to the map stored in the storage unit and a storage unit that stores a map in which the target pressure of the air ejection means is set in correspondence with the printing operation speed so as to increase as the speed increases. A control unit having a calculation unit that calculates the target pressure corresponding to the printing operation speed ;
And a changing means for forcibly changing the target pressure calculated by the calculating unit,
The control device normally controls the air supply amount so as to be the target pressure calculated by the calculation unit. When the target pressure is forcibly changed by the changing means, the changing means The folding apparatus for a printing press, wherein the air supply amount is controlled so that the target pressure is forcibly changed . The map stored in the storage unit corresponds to the printing operation speed and the building page so that the printing operation speed increases as the printing operation speed increases and increases as the building page decreases. And the target pressure of the air ejection means is set,
The calculation unit calculates the target pressure corresponding to the printing operation speed and the building page with reference to the map stored in the storage unit,
The control device, the pressure of the air ejected from the upper Symbol air injection means, as the printing operation speed increases with increasing speed, and, the air to be higher according to the above Kenpeji decreases 2. The folding device for a printing press according to claim 1, wherein the supply amount is controlled. The changing means is an input device to which the target pressure is directly input, and the target pressure calculated by the calculation unit is forcibly changed by directly inputting the target pressure,
The storage unit stores the directly input target pressure,
The arithmetic unit periodically averages the target pressure stored and accumulated in the storage unit, and reflects the averaged target pressure in the map.
The folding device for a printing press according to claim 1 or 2, wherein the folding device is a printer. The changing means is configured to be able to determine via the changing means whether to reflect the average processed target pressure on the map.
The folding apparatus for a printing press according to claim 3, wherein A plurality of grooves formed side by side in the circumferential direction and in the roller axial direction are provided on at least one surface of the pair of folding rollers;
The folding apparatus for a printing press according to any one of claims 1 to 4, wherein the air ejecting means is configured to eject air from the groove toward the end of the web. . The folding apparatus for a printing press according to any one of claims 1 to 5, wherein the target pressure is set to continuously increase as the printing operation speed increases. . The folding apparatus for a printing press according to any one of claims 1 to 5, wherein the target pressure is set to increase stepwise as the printing operation speed increases. . The map is prepared for each paper type of the web,
The folding device for a printing press according to any one of claims 1 to 7, wherein the calculation unit calculates the target pressure with reference to a map corresponding to a paper type of the web. A control valve that is provided in a pipe for supplying air from the air supply source to the air ejection means, and capable of continuously changing the opening;
Pressure detecting means for detecting the pressure of the air ejected from the air ejecting means,
The control apparatus is characterized in that the pressure detected by said pressure detecting means to adjust the degree of opening of the control valve so that the target pressure, according to any one of claims 1-8 Printer folding device. A control valve provided on each of a plurality of pipes for supplying air from the air supply source to the air ejection means, and the opening degree of which can be switched to full open or fully closed;
Pressure detecting means for detecting the pressure of the air ejected from the air ejecting means,
The control device, pressure detected by said pressure detecting means is equal to or switching the opening of the plurality of control valves so that the target pressure, according to any one of claims 1-8 Printing machine folding device. A folding cylinder that forms a signature by feeding a web to a contact portion of a pair of folding rollers that rotate in contact with each other,
A recess formed in a concave shape on the circumferential surface of the folding cylinder;
A folding blade that is provided in the recess, rotates in a direction opposite to the rotation direction of the folding cylinder and protrudes in the circumferential direction as it approaches the contact portion, and pushes the web into the contact portion;
It is provided on the downstream side in the folding cylinder rotation direction with respect to the recess in the circumferential surface, can be stored in the circumferential surface, and can protrude outward in the circumferential direction as the centrifugal force increases due to the rotation of the folding cylinder. A folding cylinder comprising a movable member. The movable member is a leaf spring member provided substantially along the circumferential direction of the folding cylinder,
The downstream end of the leaf spring member in the folding cylinder rotation direction is fixed to the circumferential surface, and the upstream end of the leaf spring member in the folding cylinder rotation direction extends to a position close to the recess. It characterized in that it includes a weight, folding cylinder according to claim 1 1, wherein. It said movable member, characterized in that it is formed in a strip that is continuous along the axial direction of the folding cylinder, according to claim 1 1 or 1 2 folding drum according. It said movable member, characterized in that are provided intermittently at predetermined intervals in the axial direction of the folding cylinder, according to claim 1 1 or 1 2 folding drum according. Above, wherein the provided with a folding cylinder according to any one of claims 1 1 to 1 4, the folding of the printing press unit. A folding cylinder that forms a signature by feeding a web to a contact portion of a pair of folding rollers that rotate in contact with each other,
A recess formed in a concave shape on the circumferential surface of the folding cylinder;
A folding blade that is provided in the recess, rotates in a direction opposite to the rotation direction of the folding cylinder and protrudes in the circumferential direction as it approaches the contact portion, and pushes the web into the contact portion;
A convex portion projecting outward in the circumferential direction on the downstream side of the folding cylinder rotation direction from the recess in the peripheral surface;
It is provided on the downstream side in the rotation direction of the folding cylinder from the convex portion on the peripheral surface, can be stored in the peripheral surface, and is more than the convex portion with an increase in centrifugal force due to the rotation of the folding cylinder. A folding cylinder comprising a movable member capable of projecting outward in the circumferential direction. The movable member is a leaf spring member provided substantially along the circumferential direction of the folding cylinder,
The downstream end of the leaf spring member in the folding cylinder rotation direction is fixed to the peripheral surface, and the upstream end of the leaf spring member in the folding cylinder rotation direction extends to a position close to the convex portion. The folding cylinder according to claim 16 , further comprising a weight. The folding cylinder according to claim 16 or 17 , wherein the movable member is formed in a continuous belt shape along the axial direction of the folding cylinder. The folding cylinder according to claim 16 or 17 , wherein the movable member is provided intermittently at a predetermined interval in the axial direction of the folding cylinder. The convex portion, characterized in that it is formed in a strip that is continuous along the axial direction of the folding cylinder, the folding cylinder according to any one of claims 1 6-19. The folding cylinder according to any one of claims 16 to 19 , wherein the convex portion is provided intermittently at a predetermined interval in the axial direction of the folding cylinder. Above, wherein the provided with a folding cylinder as claimed in any one of claims 1 6-2 1, folding of the printing press unit. A folding cylinder that forms a signature by feeding a web to a contact portion of a pair of folding rollers that rotate in contact with each other,
A recess formed in a concave shape on the circumferential surface of the folding cylinder;
A folding blade that is storable in the recess, rotates in a direction opposite to the rotation direction of the folding cylinder, and protrudes in a circumferential direction as it approaches the contact portion, and pushes the web into the contact portion;
A folding cylinder comprising a protrusion provided on the upstream side of the folding blade in the rotation direction of the folding blade and capable of projecting outward in the circumferential direction as the folding blade is stored in the recess. The folding blade is composed of a rotating shaft and a blade body protruding from the rotating shaft,
The protrusion is attached to a position upstream of the blade shaft in the folding shaft rotation direction on the rotating shaft and close to the protrusion position. , folding cylinder according to claim 2 3 wherein. Characterized in that the said blade body surface and the protruding portions of the folding blade rotation direction upstream side end portion of the surface are smoothly connected, folding drum according to claim 2 4, wherein. Folding blade rotation direction intermediate portion of the protruding portion, characterized in that it is formed in a curved shape, folding drum according to any one of claims 2 3-2 5. Above, wherein the provided with a folding cylinder according to any one of claims 2 3-2 6, folding of the printing press unit.

Images