JP2532047Y2 - Printing device paper threading mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper threading mechanism of a printing apparatus, and relates to a mechanism for automatically mounting continuous paper on a printing apparatus such as an offset rotary press.

(Background technology)

2. Description of the Related Art Conventionally, in a printing apparatus such as an offset rotary press, continuous paper (web) is used as printing paper, and the web is drawn out of a roll by a paper feeding unit, and the printing units are sequentially linearly arranged. It is continuously fed through a drying unit and a folder.

In such a web-type printing apparatus, an automatic paper threading mechanism for introducing a web end by a continuous member arranged along the web path is used for inserting and mounting the web in a predetermined path. For example, in a rotary press for newspapers and the like, the end of the web is sandwiched between cuts of the belt along the web path, and the web is inserted by feeding the belt. On the other hand, in a printing apparatus having a drying unit, since the belt becomes unusable due to high temperature, chains are arranged on both sides of the web path, and the end of the web is locked by a paper passing bar bridged between them. The web is inserted by sending a chain.

[Problems to be solved by the invention]

By the way, the roll for extracting the web is generally only supported so as to be rotated in accordance with the extraction of the web, and its rotational inertia is considerably large. For this reason, at the beginning of the paper threading operation, a large load is applied to the drawn web or the continuous member for driving,
The inserted web may be torn in the middle. Also,
There is a possibility that a mechanical portion such as a paper passing bar for drawing out the web is deformed or damaged. In particular, in the printing unit portion, it is necessary to reduce the thickness of the paper passing bar in order to pass between the blanket cylinders, so that deformation or the like is likely to occur.

On the other hand, there is a difference between the web path and the continuous member path in each part, and the rotation speed of the roll is not necessarily synchronized with the web introduction speed due to the rotational inertia described above. For this reason, the web sequentially introduced into the path may be slackened or the like, causing interference with other mechanisms or the like, and may cause the web to be torn by an impact when it is stretched again.

To solve these problems, it is conceivable to appropriately adjust the feed speed of the continuous member or to positively drive the roll, but there are problems such as a complicated control system and a separate motor. For this reason, a method is employed in which the operator manually assists the rotation of the roll and adjusts the rotation according to the web feed speed, which has been an obstacle in promoting automation.

Further, due to the aforementioned load and slackness, the continuous member for feeding the web end cannot be extended beyond a certain value, and it is difficult to cover the entire printing apparatus with a series of continuous members. For this reason, the work of changing the end portion of the web between the units is required, and this work is also usually performed manually, which is an obstacle to automation along with the manual feed of the roll.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper-passing mechanism of a printing apparatus which can automatically perform reliable paper-passing and has a simple structure.

[Means for solving the problem]

The present invention is a paper threading mechanism that introduces an end of a web into a web path by a continuous member disposed along a web path of a printing apparatus, wherein the peripheral speed is substantially equal to a feed speed of the continuous member by the continuous member. A feed roller that is rotated and driven by a pressure roller, a pressing roller that is pressed against and rolled on the feed roller via a web, a driving unit that presses and separates the feed roller from the pressing roller, and controls the driving unit. The feeding of the web is automatically interrupted according to the degree of slack of the web, and when there is no slack in the web, the web is fed by pressing the feed roller and the pressing roller, and the web is slackened. Is provided with control means for releasing the web feed by separating the feed roller and the pressing roller.

Here, an air cylinder, a solenoid, or the like may be used as the driving means, and it is desirable to use an appropriate control means for switching the driving means.

For example, a feedback-type control unit that uses a sensor or the like that detects the slack of the web on the lower side of the feed roller, separates the press roller when slack occurs, and eliminates the slack or presses the press roller can be used.

Further, as the control means, an operation means capable of switching the driving means from the outside and a learning type sequence controller for recording the contents of the operation in a time series are provided, so that the web does not loosen manually as a preliminary operation. Control means for automatically executing the next or subsequent paper threading operation based on the switching sequence, or a sensor for detecting the slack of the web, and switching the driving means when the sensor detects the slack. Control means can be used to automatically control the slack.

On the other hand, the arrangement of the feed roller and the pressing roller is arbitrary, and it is desirable to install them at appropriate positions on the web path as needed.

[Action]

In the present invention, the web end drawn from the roll is introduced by a continuous member and inserted into a predetermined path of the printing apparatus.

At this time, the feed roller is driven to rotate at substantially the same peripheral speed as the continuous member, and when pressed against the pressing roller, pinches and feeds the web, and assists the continuous member in pulling out the web. Therefore, even when the resistance of the roll is large, the web can be reliably pulled out.

On the other hand, the feed roller is appropriately pressed and separated from the press roller by the driving means, and when the web is loosened or the like, the feed roller is separated from the press roller to release the feed of the web by the feed roller. The slack is eliminated by the tension between the member and the roll.

Accordingly, the necessity of manually turning the roll due to the load and the slack as in the related art is eliminated, and the distance that can be introduced by a series of continuous members is extended by appropriately arranging the respective rollers. This eliminates the need for manual replacement between the sheets, and enables the paper threading operation to be automated.

Further, by using a continuous member for driving the feed roller, the structure can be simplified, thereby achieving the above-described object.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, a printing apparatus 1 of the present embodiment is shown.
Has a paper feed unit 10, a plurality of offset double-sided printing units 20, and a dryer unit 30 arranged in a straight line. A web 2 as a printing paper is inserted into each of the units 10 to 30, and the web 2 is maintained in a predetermined path 4 by a number of guide rollers 3.

The paper feeding unit 10 includes a rotating arm 11 that supports a roll 5 around which the web 2 is wound, and an infeed unit 12 having a number of straightening rollers into which the drawn web 2 is introduced. The web 2 is supplied to the printing unit 20 after its tension and curl have been corrected.

The printing unit 20 includes a pair of blanket cylinders 21 and plate cylinders 22 above and below the web 2, respectively, and these are collectively pressed and separated from the web 2 by a switching mechanism (not shown). At the time of separation, each blanket cylinder 21 is held at a slight distance from the web 2, and at the time of pressing, the ink of the printing plate wound around the plate cylinder 22 is transferred via the blanket cylinder 21 to the web 2 passing therethrough. Double-sided printing is performed.

The dryer unit 30 is for heating and drying the printed web 2 sent from the printing unit 20, and sending it to a subsequent folding machine or the like.

On the other hand, each unit 10 to 30 has a web 2
A paper threading mechanism 40 for inserting and mounting the sheet is provided.

The paper passing mechanism 40 basically uses a chain 41 and a paper passing bar 42 which are continuous members.

The chains 41 are arranged on both sides of the path 4 and the feed unit
In the section from 10 to immediately before the dryer unit 30, the circulation type is a continuous circulation type. Each chain 41 is supported by a number of guide sprockets 43, and the upper feed side is route 4
, And the lower return side is located along the foundation. In addition, a rotation drive mechanism (not shown) is connected to an arbitrary sprocket 43, and each chain
41 is sent at the same speed.

The paper passing bar 42 is a thin plate-like member that can be inserted between the blanket cylinders 21 of the printing unit 20 described above.
And both ends are locked to each chain 41. Therefore, the edge of the web 2 pulled out near the roll 5 is wound around the paper passing bar 42 and locked, and the chain 41 is fed. 4, and the web 3 is inserted into the path 4.

Here, the guide roller 3 closest to the roll 5 is a pressing roller 51, and a feed roller is provided in parallel on the opposite side of the web 3.
52 are arranged.

As shown in FIG. 3 and FIG. 4, the feed roller 52 is rotatably supported at the distal ends of the swing arms 53 on both sides. The swing arm 53 is rotatably supported at its base end by the side wall 13 of the paper feed unit 10 and is swung by an air cylinder 54 as a driving means. By this swing, the feed roller 52 is pressed and separated from the press roller 51. The side wall 13 has an adjustable stopper 55 which comes into contact with the swing arm 53 during pressure contact.
Is provided, and the pressure contact state between the feed roller 52 and the pressing roller 51 is kept constant.

A first sprocket 61 is coaxially fixed to an end of the feed roller 52, and a second sprocket 62 is rotatably supported on an extended portion of a pivot shaft of the swing arm 53. The third sprocket 63 is coaxially fixed. The third sprocket 63 is engaged with the chain 41, and a chain 64 is provided between the second and first sprockets 62 and 61.
Is spanned. The swing arm 53 has a chain 64
An adjustable tensioner 65 that slides on is provided.
The transmission means 60 is constituted by the sprockets 61 to 63 and the chain 64, and the feed roller 52 is rotationally driven by the chain 41 via the transmission means 60, and drives the pinched web 3 when pressed against the pressing roller 51. It is possible to send out. The transmission means 60 is set so that the peripheral speed of the feed roller 52 is equal to the feed speed of the chain 41.

On the other hand, a learning-type control means 70 is connected to the air cylinder 54 as a driving means.

As shown in FIG. 5, an accumulator 72 for supplying pressurized air via a switching valve 71 and an exhaust pipe 73 are connected to the air cylinder 54, and the air cylinder 54 supplies air by switching the switching valve 71. It is discharged and stretched. Switching valve 71
Is connected to a switching control unit 74, and the switching control unit 74 controls switching of the switching valve 71 in accordance with an input command.

An operation panel 75 is connected to the switching control section 74, and expansion and contraction of the air cylinder 54 can be arbitrarily operated by an external operation of the operation panel 75. The switching control unit 74 is connected to a sequence recorder 76, to which a moving distance counter 77 is connected.

An encoder 78 is connected to the moving distance counter 77, and the encoder 78 is connected to a motor 79 that drives one of the sprockets 43 to drive the chain 41. Therefore, when the motor 79 rotates to feed the chain 41, a pulse corresponding to the rotation is output from the encoder 78, and the movement distance counter 77 counts the output pulses to determine the distance from the movement start of the chain 41. Integrate.

The sequence recorder 76 operates on the operation panel in the recording mode.
The external operation data given from 75 to the switching control unit 74 is recorded as sequence data together with the distance data from the movement distance counter 77 (see FIG. 6). In the automatic mode, the distance data from the movement distance counter 77 is recorded. The sequence data recorded in accordance with is read, and external operation data at the corresponding distance is supplied to the switching control unit 74 to expand and contract the air cylinder 54. Therefore, the operation panel
If an appropriate manual operation is performed from 75, the operation of the air cylinder 54 at that time is automatically reproduced in the subsequent paper feed. These constitute a learning-type control means 70.

In this embodiment, the paper threading operation is performed in the following procedure.

First, the end of the web 2 is manually pulled out of the roll 5 for a predetermined length, set on the paper passing bar 42, and locked on the chain 41. Next, the chain 41 is activated and fed to drive the web 2 to sequentially pull it out of the roll 5 and to introduce it along the path 4 to perform a paper threading operation. At this time, the web 2 following the paper passing bar 42 is nipped and fed by the feed roller 52 and the pressing roller 51 to assist in drawing out the web 2.

Here, when the web 2 to be used is new, for example, the learning driving is performed. That is, after setting the sequence recorder 76 to the recording mode, the chain 41 is started, and a manual operation is performed from the operation panel 75 while monitoring the slack of the fed web 2 and the like. The auxiliary feed of the web 2 by the pressing roller 51 is interrupted,
The web 2 is adjusted so as not to be slackened. This allows the web 2 to be threaded through the path 4 and
Sequence data is recorded that records the optimal auxiliary feed intermittent timing for the web 2.

On the other hand, when using the same web 2 as the previous time, the automatic operation is performed. In other words, if the chain 41 is started after the sequence recorder 76 is set to the automatic mode, the web 2 is similarly threaded through the path 4 and the air cylinder 54 is set based on the previously recorded sequence data.
The auxiliary feeding of the web 2 by the feed roller 52 and the pressing roller 51 is intermittently interrupted, so that the optimum auxiliary feeding is automatically executed so that the web 2 is not loosened.

According to this embodiment, the following effects can be obtained.

That is, the chain 41, which is a continuous member, and the paper passing bar
The end of the web 2 is introduced along the path 4 of the printing apparatus 1 by the use of the printing apparatus 1, and the web 2 can be auxiliary-fed by the feed roller 52 and the pressing roller 51 that rotate at substantially the same peripheral speed as the chain 41.

In particular, since the feed roller 52 and the pressing roller 51 are provided at the entrance side of the path 4, that is, at the position closest to the roll 5, the web 2 can be stably pulled out from the roll 5 by the auxiliary feed, and the resistance of the roll 5 is large. Even in such a case, reliable paper threading can be performed without tearing the web 2 or deforming the paper threading bar 41.

Further, since the load on the paper passing bar 41 can be reduced by the auxiliary feed, the paper passing bar 41 can be made thinner,
A long distance from the paper feed unit 10 to the print unit 20 can be automatically passed through the paper collectively.

Further, the feed roller 52 and the pressing roller 51 for performing the auxiliary feed are appropriately pressed and separated by the air cylinder 54, so that when the web 2 becomes loose due to the feed of the chain 41, the auxiliary feed is appropriately performed. Is released, tension is applied between the end of the web 2 and the roll 5 to eliminate slack.

In particular, the interruption of the auxiliary feed can be automatically executed by the learning-type control means 70. In the automatic execution, the optimal operation performed while monitoring the slack of the web 2 as the learning operation in advance can be repeatedly reproduced. In addition, even a complicated operation or the like corresponding to the actual operation can be easily and automatically executed.

Therefore, it is not necessary to manually rotate the roll 5 to prevent the web 2 from being torn or loosened, and it is possible to reduce paper splicing or the like by manual operation between units as in the related art. Can be improved.

Further, since the feed roller 52 for auxiliary feed is driven by the chain 41 via the transmission means 60, no additional power or the like is required, and the apparatus configuration can be simplified.

The present invention is not limited to the above embodiment, but includes the following modifications.

For example, in the control means 70 for interrupting the auxiliary feed, as a criterion for recording and reproducing the operation data by the sequence recorder 76, the feed of the chain 41 may be directly counted by a sensor and used as moving distance data, or the moving distance counter 77 may be used. Instead of the moving distance data, time data by a timer or the like that measures the time when the chain 41 is activated may be used.

The means for interrupting the auxiliary feed is not limited to the learning-type control means 70, but may be a slack detection-type control means 80 as in the other embodiment shown in FIG.

In the figure, an air cylinder 54, a switching valve 71, an accumulator 72, an exhaust pipe 73, and a switching control unit 74 are the same as those in the previous embodiment. On the other hand, a slack detection unit 81 is connected to the switching control unit 74, and a pair of beam cutoff sensors 82 and 83 using light or ultrasonic waves are connected to the slack detection unit 81.

Each of the sensors 82 and 83 is disposed so as to sandwich an intermediate portion (a portion where slack is likely to occur) of the web 2 held by the guide roller 3 and the like, and detects the slack webs 2A and 2B as illustrated. Note that pairs of sensors 82 and 83 are installed at a plurality of locations as needed.

The slack detection section 81 is normally provided with an air cylinder
The extension of the cylinder 54 is instructed, but when any of the sensors 82 and 83 detects the loosening, the switching controller 74 is instructed to retract the air cylinder 54.

Therefore, according to the control means 80 of the present embodiment, the auxiliary feed is normally performed to the web 2, but when the web 2 becomes slack, the auxiliary feed is automatically released. For this reason, detailed settings cannot be made as compared with the learning-type control means 70 described above, but there is no need to perform a learning operation, and it is possible to completely automate the operation.

On the other hand, in the above embodiment, the air cylinder 54 is used as the driving means.
However, this may be a solenoid or a motor, and the switching valve 71 or the accumulator 72 and the like can be omitted, and the control system can be simplified.

Further, the means for driving the feed roller 52 for auxiliary feeding is not limited to the one that utilizes the driving force of the chain 41 via the transmission means 60, and a dedicated drive motor or the like may be separately used. However, in consideration of synchronization adjustment at the time of rotation, it is desirable to configure as in the above embodiment.

In addition, as a rotational drive for auxiliary feed, feed roller
Not only the driving on the side 52 but also the driving on the side of the pressing roller 51 may be performed so that the auxiliary feeding can be performed at the time of pressing against the feed roller 52. However, in consideration of the constant sliding contact with the web 2, it is desirable to configure as in the above embodiment.

In the above embodiment, the chain 41 is used as the continuous member, and the end of the web 2 is fed by the paper passing bar 42. However, a belt or the like may be used.

Furthermore, the installation positions of the feed roller 52 and the swing arm 53 are arbitrary, and their specific materials and structures may be changed in implementation.

Further, the printing apparatus 1 to which the present invention is applied is not limited to the configuration as in the above embodiment, and the present invention can be applied as a paper passing mechanism of various printing apparatuses.

[Effect of the invention]

As described above, according to the present invention, it is possible to cope with a large load by performing the auxiliary feeding of the web, and it is possible to cope with the looseness by appropriately interrupting the auxiliary feeding,
The paper threading of the printing apparatus can be reliably and automatically performed with a simple structure.

[Brief description of the drawings]

1 and 2 are a side view and a plan view, respectively, showing a schematic overall configuration of an embodiment of the present invention, and FIGS.
5 is a side view and a plan view, respectively, showing a main part of the embodiment, FIG. 5 is a block diagram showing a control system of the embodiment, and FIG.
FIG. 7 is a graph showing the operation of the embodiment, and FIG. 7 is a block diagram showing a control system of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Printing apparatus, 2 ... Web, 4 ... Path | pass, 5 ... Roll, 40 ... Paper passing mechanism, 41 ... Chain which is a continuous member, 51 ... Holding roller, 52 ... Feeding roller, 54 ... Air cylinder as driving means.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-1045 (JP, A) JP-A-61-196028 (JP, A) JP-A-61-94960 (JP, A) JP-A-62 278037 (JP, A) JP-A-64-13355 (JP, A) JP-A-59-138551 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A paper threading mechanism for introducing an end of a web into a printing apparatus by means of a continuous member disposed along the web path of the printing apparatus, wherein the continuous member has a circumference substantially equal to a feed speed of the continuous member. A feed roller that is rotationally driven at a speed, a pressing roller that is pressed against and rolled on the feed roller via a web, a driving unit that presses and separates the feed roller from the pressing roller, and controls the driving unit. The web feed is automatically interrupted in accordance with the degree of slack of the web, and when there is no slack in the web, the web is fed by pressing the feed roller and the pressing roller, and the web is slackened. And a control unit for separating the feed roller and the press roller from each other to release the web feed.