JPH11105268A - Cleaning device of cylinder of printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wasteful consumption of cleaning cloth by always unwinding or winding the cleaning cloth in a prescribed quantity. SOLUTION: A cleaning device 29 of a blanket cylinder has an unwinding shaft 542 on the outer peripheral part of which long-length cleaning cloth 541 for cleaning a first blanket cylinder 13 is wound, a winding shaft 543 which winds the cleaning cloth 541 let out from the unwinding shaft 542, a presser roller 544 which is provided for pressing the cleaning cloth 541 on the first blanket cylinder 13 and moves back and forth between a position of pressing and a position of withdrawal and a cleaning liquid pipe 549 for discharging a cleaning liquid to the cleaning cloth 541. In this cleaning device 29 of the blanket cylinder, operations of unwinding and winding the cleaning cloth 541 are executed by utilizing a difference between a stretch path length of the cleaning cloth 541 in the case when the presser roller 544 moves to the position of pressing and the stretch path length of the cleaning cloth 541 in the case when the presser roller 544 moves to the position of withdrawal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder cleaning device for a printing apparatus for cleaning a cylinder by bringing a cleaning cloth into contact with the cylinder of the printing apparatus.

[0002]

2. Description of the Related Art As a cleaning apparatus for cleaning a blanket cylinder, a plate cylinder, an impression cylinder, or the like in a printing apparatus, a cleaning cloth is fed from an unwinding shaft around which a long cleaning cloth is wound. In addition to unwinding, the cleaning cloth is brought into contact with the surface of the body by a pressing roller, a pad, or the like to clean the body, and thereafter, the cleaning cloth contaminated by the cleaning is wound around a winding shaft. Things are known. In such a cleaning device, the take-up shaft is intermittently rotated by the drive of the motor, so that the cleaning cloth contaminated by the cleaning is sequentially taken up around the outer periphery of the take-up shaft. It has a configuration.

[0003]

The cleaning cloth for cleaning the body usually has a length of several tens of meters. Therefore, when a large amount of the cleaning cloth is wound around the outer periphery of the winding shaft by repeatedly executing the cleaning of the body, the diameter of the winding shaft including the cleaning cloth is firstly cleaned with the cleaning cloth. It is extremely large compared to the time when it was.

For this reason, even when the take-up shaft is intermittently rotated by a motor at an exactly fixed angle, the length of the cleaning cloth wound on the take-up shaft is initially , And becomes extremely large as compared with the time when the cleaning is performed. Therefore, more cleaning cloth is consumed than is necessary for cleaning the body.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a cylinder of a printing apparatus capable of preventing wasteful consumption of a cleaning cloth by always unwinding or winding up a predetermined amount of the cleaning cloth. It is an object to provide a cleaning mechanism.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a cylinder cleaning device for a printing apparatus, in which a cleaning cloth is brought into contact with a cylinder of the printing apparatus to clean the cylinder, and a cleaning device for cleaning the cylinder at an outer peripheral portion thereof. An unwinding shaft on which a cleaning cloth of a length is wound, an unwinding shaft support mechanism for rotatably supporting the unwinding shaft while applying a braking force, a winding shaft for winding the cleaning cloth, and the winding shaft A take-up shaft supporting mechanism that rotatably supports the take-up shaft in only one direction, and a rotation drive mechanism that rotates the take-up shaft in the one direction with a driving force smaller than a braking force applied to the unwind shaft. A pressing member that presses the cleaning cloth in a spreading path of the cleaning cloth unwound from the unwinding shaft and wound on the winding shaft; and pressing the pressing member against the cylinder via the cleaning cloth. The pressing position in contact with
A moving mechanism for reciprocating between a retracted position separated from the pressing position, and an extension path length of the cleaning cloth when the pressing member moves to the pressing position, wherein the pressing member moves to the retracted position. The pressing member is arranged so as to be longer than the length of the stretched path of the cleaning cloth when moved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a printing apparatus to which a blanket cylinder cleaning device 29 according to the present invention is applied.

This printing apparatus comprises a first and a second plate cylinder 11,
After recording an image on a printing plate having no image recorded on the plate 12 and making a plate, the ink supplied to the printing plate is applied to the impression cylinder 15 via the first and second blanket cylinders 13 and 14. The printing is performed by transferring the image to the held printing paper.

This printing apparatus includes a first plate cylinder 11 movable between a first printing position shown by a solid line in FIG. 1 and an image recording position shown by a two-dot chain line, and a first printing cylinder 11 shown by a solid line in FIG. And a second plate cylinder 12 movable between the second printing position and the image recording position.

[0010] The first plate cylinder 11 moved to the first printing position
Around the printing plate, an ink supply device 20a for supplying black (K) ink to the printing plate, an ink supply device 20b for supplying magenta (M) ink to the printing plate, and a printing plate. The dampening water supply devices 21a and 21b for supplying dampening water are arranged. Further, around the second plate cylinder 12 moved to the second printing position, an ink supply device 20c for supplying, for example, cyan (C) ink to the printing plate, and a yellow (Y) ink to the printing plate, for example.
An ink supply device 20 d for supplying the ink of the present invention, a dampening solution supply device 21 c for supplying a dampening solution to the printing plate,
21d. Further, around the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, a plate feeding unit 23, a plate discharging unit 24, and an image recording device 25 are provided.
And a developing device 26 are disposed.

The printing apparatus includes a first blanket cylinder 13 provided so as to be in contact with the first plate cylinder 11 and a second blanket cylinder provided so as to be in contact with the second plate cylinder 12. The impression cylinder 1 provided so as to be able to contact the cylinder 14 and the first and second blanket cylinders 13 and 14 at different positions.
5, a paper feed cylinder 16 for passing the print paper supplied from the paper feed unit 27 to the impression cylinder 15, and a chain 1 for discharging the printed print paper received from the impression cylinder 15 to the paper discharge unit 28.
And a blanket cylinder cleaning device 29 according to the present invention.

The first and second plate cylinders 11 and 12 are connected to a not-shown plate cylinder moving mechanism, respectively, and driven by the plate cylinder moving mechanism to move the first or second printing position to the above-described first or second printing position. It reciprocates between the image recording position. Further, the first plate cylinder 11 rotates in synchronization with the first blanket cylinder 13 at the first printing position, and the second plate cylinder 12 rotates with the second blanket cylinder 14 at the second printing position. It is configured to rotate in synchronization. Further, a plate cylinder rotating mechanism (not shown) is provided in the vicinity of the image recording position, and when the first and second plate cylinders 11 and 12 are both moved to the image recording position, the plate cylinder rotates. It is configured to rotate by driving a rotation mechanism.

Around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position, a plate feeding section 23 and a plate discharging section 2 are provided.
4 are arranged.

The plate supply section 23 includes a supply cassette 63 for storing a long roll-shaped printing plate on which no image is recorded in a light-tight state, and a leading end of the printing plate pulled out from the supply cassette 63. A guide member 64 and a guide roller 65 for guiding the surface of the first plate cylinder 11 or the second plate cylinder 12 and a cutter 66 for cutting a long printing plate into a sheet-shaped printing plate are provided. It is arranged. The first and second plate cylinders 11 and 12 are provided with a pair of holding claws (not shown) for holding the leading and trailing ends of the printing plate supplied from the plate supply unit 23. .

After the printing is completed, the plate discharging section 24 starts the first plate cylinder 1
A claw mechanism 73 for peeling the printing plate held on the first or second plate cylinder 12; a conveyor mechanism 69 for transporting the printing plate peeled off by the action of the claw mechanism 73 to the discharge cassette 68; It has a cassette 68.

The leading end of the printing plate pulled out of the supply cassette 63 in the plate supplying section 23 is guided by a guide roller 65 and a guide member 64, and one of the first plate cylinder 11 and the second plate cylinder 12 is held. It is added to the nail. Then, the first plate cylinder 11 or the second plate cylinder 12 is rotated by the drive of the plate cylinder rotating mechanism 30, and the printing plate is moved to the first plate cylinder 11.
Alternatively, it is wound around the outer peripheral portion of the second plate cylinder 12. Then, the rear end of the printing plate cut by the cutter 66 is held by the other holding claw. In this state, while the first plate cylinder 11 or the second plate cylinder 12 is rotated at a low speed, the printing held by the image recording device 25 on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12 is performed. The surface of the plate is irradiated with a modulated laser beam and an image is recorded.

The printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 is applied to the printing plate P by the image recording device 25 as shown in FIG.
As shown in FIG. 7, an image area 67a for printing with black ink and an image area 67b for printing with magenta ink are recorded. Also, the second plate cylinder 12
The printing plate P mounted on the outer peripheral portion of the
Thus, as shown in FIG. 2B, an image area 67c for printing with cyan ink and an image area 67d for printing with yellow ink are recorded. The image area 67a and the image area 67b are recorded at positions that are equally distributed (that is, 180 degrees apart from each other) when mounted on the outer peripheral portion of the first plate cylinder 11. Similarly, the image area 67c and the image area 6
7d refers to a state in which the second plate cylinder 12 is mounted on the outer periphery of the second plate cylinder 12 and is uniformly distributed (that is, 1
80 degrees apart).

Referring again to FIG. 1, as described above, around the first plate cylinder 11 moved to the first printing position, the ink supply devices 20a and 20b are provided. An ink supply device 20c and an ink supply device 20d are arranged around the second plate cylinder 12 moved to the second printing position. These ink supply devices 20a, 20
Each of b, 20c, and 20d (hereinafter, collectively referred to as “ink supply device 20”) has a plurality of ink rollers 71 and ink fountains 72.

The ink rollers 71 of the ink supply devices 20a and 20b perform a swing operation by the action of a cam or the like (not shown). Then, by this swinging operation, the two image areas 6 formed on the printing plate P held on the outer peripheral portion of the first plate cylinder 11 are formed.
When an ink roller 71 of the ink supply device 20a or 20b comes into contact with an arbitrary image area of 7a and 67b, ink can be supplied only to a necessary image area. Similarly, the ink supply device 20
The ink rollers 71 of c and 20d also swing by the action of a cam or the like (not shown). And, by this swinging operation,
The ink roller 71 of the ink supply device 20c or 20d comes into contact with an arbitrary image region of the two image regions 67c and 67d formed on the printing plate P held on the outer peripheral portion of the second plate cylinder 12. With this configuration, ink can be supplied only to a necessary image area.

The fountain solution supply devices 21a, 21b, 21c and 21d (hereinafter, collectively referred to as "fountain solution supply device 21") are used before the ink supply device 20 supplies ink to the printing plate P. Then, a dampening solution is supplied to the printing plate P. Of these dampening water devices 21, the dampening water supply device 21a is an image area 67a in the printing plate P.
The dampening solution supply device 21b is in the image region 67b of the printing plate P, the dampening solution supply device 21c is in the image region 67c of the printing plate P, and the dampening solution supply device 21d is in the image region 67d of the printing plate P. Are supplied with fountain solution.

Below the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, a developing device 26 is provided. The developing device 26 has a developing unit, a fixing unit, and a diaphragm unit, and is configured to be able to move up and down between a standby position indicated by a two-dot chain line and a developing position indicated by a solid line in FIG.

When the printing plate P on which an image is recorded by the image recording device 25 is developed by the developing device 26, the printing plate P rotating together with the first plate cylinder 11 or the second plate cylinder is processed. Then, the developing unit, the fixing unit, and the diaphragm unit are sequentially brought into contact.

The first and second blanket cylinders 13 and 14, which are provided so as to be able to contact the first and second plate cylinders 11 and 12,
It has the same diameter as the first and second plate cylinders 11 and 12, and a blanket for ink transfer is mounted on the outer periphery thereof. Then, the first and second blanket cylinders 13, 1
Reference numeral 4 denotes a configuration in which the first and second plate cylinders 11 and 12 and the impression cylinder 15 can be freely contacted and separated by a cylinder insertion mechanism (not shown).

The blanket cylinder cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 is connected to the take-up shaft 5 from the unwind shaft 542 via the pressing roller 544.
The cleaning liquid is supplied to the long cleaning cloth 541 spread on the path leading to 43, and the cleaning cloth is brought into contact with the first and second blanket cylinders 13 and 14 and then slid. This is for cleaning the surfaces of the first and second blanket cylinders 13 and 14. The configuration of the blanket cylinder cleaning device 29 will be described later in detail.

The impression cylinder 15 provided so as to be able to contact the first and second blanket cylinders 13 and 14 is provided with the first and second plate cylinders 1.
1, 12 and first and second blanket cylinders 13, 14
直径 of the diameter of Further, the impression cylinder 15 has a gripper (not shown) for holding and transporting the leading end of the printing paper.

The paper feed cylinder 16 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper feeding cylinder 16 holds and transports the leading end of the printing paper supplied one by one from the paper feeding unit 27 by a gripper (not shown) by a suction board 74 that reciprocates. The leading end of the printing paper held by the gripper is held by the gripper of the impression cylinder 15 when the printing paper is transferred from the paper feed cylinder 16 to the impression cylinder 15.

The paper discharge cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper discharge cylinder 17 has a structure in which a pair of chains 19 is wound around both ends, and grippers are provided on connecting members (not shown) that connect the pair of chains 19. The leading end of the printing paper held by the gripper of the impression cylinder 15 is
When the printing paper is transferred from the impression cylinder 15 to the discharge cylinder 17,
It is held by one of the grippers of the paper discharge cylinder 17. Then, the printing paper is conveyed onto the paper discharge unit 28 as the chain 19 moves and is discharged.

The paper feed cylinder 16 is connected to a drive motor via a belt (not shown). And the paper feed cylinder 1
6, the impression cylinder 15, the paper discharge cylinder 17, and the first and second blanket cylinders 13 and 14 are respectively connected by gears attached to their ends. Further, the first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 14 and the second plate cylinder 12 moved to the second printing position, They are connected by gears attached to their ends. Accordingly, these paper feed cylinder 16, impression cylinder 15, and discharge cylinder 1 are driven by a drive motor (not shown).
7. The first and second blanket cylinders 13, 14 and the first and second plate cylinders 11, 12 rotate in synchronization with each other.

FIG. 3 is a block diagram showing a main electrical configuration of the printing apparatus. The printing apparatus includes a ROM 141 storing operation programs necessary for controlling the apparatus,
RAM 142 for temporarily storing data and the like during control
And a control unit 140 including a CPU 143 for executing a logical operation. The control unit 140 controls the ink supply device 20, the image recording device 25, the development processing device 26, the blanket cylinder cleaning device 2 via the interface 144.
9, a drive circuit 145 for generating a drive signal for a drive unit or the like in the mechanism for inserting the first and second blanket cylinders 13 and 14 and the like. The printing apparatus uses the control unit 140
And performs a plate-making operation and a printing operation described later.

Next, plate making and printing operations by the printing apparatus will be described. FIG. 4 is a flowchart showing an outline of a plate making and printing operation by the printing apparatus.
Note that the printing and plate making operations are performed when multicolor printing is performed on printing paper with four color inks of yellow, magenta, cyan, and black.

First, a plate making process for recording an image on the printing plate P on the first and second plate cylinders 11 and 12 and performing a developing process is executed (step S1). This plate making process is executed according to the process shown in the flowchart of FIG. 5 as a subroutine.

That is, first, the first plate cylinder 11 is
Is moved to the image recording position indicated by the two-dot chain line (step S11).

Next, the printing plate P is supplied to the outer periphery of the first plate cylinder 11 (step S12). The supply of this printing plate P is
This operation is performed by holding the leading end of the printing plate P pulled out from the supply cassette 63 and the rear end of the printing plate P cut by the cutter 66 with a pair of holding claws (not shown).

Subsequently, an image is recorded on the printing plate P held on the outer periphery of the first plate cylinder 11 (step S13). The image is recorded by rotating the first plate cylinder 11 at a low speed and irradiating the modulated printing laser beam to the printing plate P held on the outer periphery of the first plate cylinder 11 from the image recording device 25. Be executed.

Next, the printing plate P on which the image has been recorded is developed (step S14). In this developing process, after the developing device 26 is raised from the standby position indicated by the two-dot chain line to the developing position indicated by the solid line in FIG.
This is performed by sequentially bringing the developing unit, the fixing unit, and the diaphragm unit into contact with the printing plate P that rotates together with the printing plate P.

When the developing process is completed, the first plate cylinder 1
1 is moved to a first printing position indicated by a solid line in FIG. 1 (step S15).

Subsequently, a plate making process for the printing plate P held on the outer periphery of the second plate cylinder 12 is executed by the same operation as in steps S11 to S15 (steps S16 to S2).
0). Then, when the plate making on the printing plate P held on the outer periphery of the first and second plate cylinders 11 and 12 is completed, the plate making process is completed.

Referring to FIG. 4 again, when the plate making process is completed, a printing process for printing on printing paper using the printing plate P on the first and second plate cylinders 11 and 12 is executed (step). S
2). This printing process is performed as follows.

That is, first, each dampening solution supply device 21 and each ink supply device 20 are connected to the first and second plate cylinders 11, 1 and 2, respectively.
2 is brought into contact only with the corresponding image area of the printing plate P held on the top. Thereby, each image area 67a, 67
b, 67c and 67d correspond to the respective dampening water supply devices 21.
Further, dampening water and ink are supplied from each ink supply device 20. Then, the ink supplied to the printing plate P is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

Then, the printing paper is supplied to the paper feed cylinder 16. The printing paper is transferred from the paper feed cylinder 16 to the impression cylinder 15. In this state, when the impression cylinder 15 continues to rotate, the impression cylinder 15
Has half the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14, so that the printing paper held on the outer periphery of the impression cylinder 15 , In the first rotation, black and cyan inks,
In the second rotation, magenta and yellow inks are transferred.

In this manner, the leading end of the printing paper on which the printing of four colors has been completed is transferred from the impression cylinder 15 to the discharge cylinder 17. The printing paper on which the printing of the four colors has been completed is conveyed to the discharge unit 28 together with the gripper of the discharge cylinder 17 by the driving of the pair of chains 19 and discharged.

When the printing process is completed, the printing plate P used for printing is discharged (step S3). In order to discharge the printing plate P, first, the first plate cylinder 11 is moved to an image recording position indicated by a two-dot chain line in FIG. Then, the first plate cylinder 11 is rotated counterclockwise, and the end of the printing plate P held on the first plate cylinder 11 is peeled off by the claw mechanism 73. It is guided by 69 and discharged into the discharge cassette 68. Then, after returning the first plate cylinder 11 to the first printing position, the second plate cylinder 12 is moved from the second printing position to the image recording position, and by performing the same operation as described above, The printing plate P held on the second plate cylinder 12 is discharged into the discharge cassette 68.

When the discharging step of the printing plate P is completed, the first and second blanket cylinders 13 and 14 are cleaned by the blanket cylinder cleaning device 29 (step S4).

When the cleaning of the first and second blanket cylinders 13 and 14 is completed, it is confirmed whether or not another printing work is to be performed (step S5). To perform another printing operation, the operations of steps 1 to 4 are repeated.

When the printing operation is completed, the ink is washed (step S6). The cleaning of the ink is performed by removing and cleaning the ink adhered to the ink roller 71 and the ink fountain 72 in each ink supply device 20 by an ink cleaning device (not shown) provided in each ink supply device 20. .

When the ink washing step is completed, all the steps are completed.

Next, the configuration of the blanket cylinder cleaning device 29 according to the present invention will be described. FIG. 6 is a side view showing a main part of the blanket cylinder cleaning device 29 according to the present invention, and FIG. 7 is a plan view thereof. In FIG. 7,
Illustration of a pressing roller 544, an air cylinder 548, and the like, which will be described later, is omitted.

As shown in FIG. 1, the blanket cylinder cleaning device 29 includes a unit for cleaning the first blanket cylinder 13 and a unit for cleaning the second blanket cylinder. And in FIG.
Only the unit for cleaning the first blanket cylinder 13 is shown. The unit for cleaning the second blanket cylinder 14 has the same configuration as the unit shown in these figures.

The blanket cylinder cleaning device 29 has an unwinding shaft 542 around which a long cleaning cloth 541 for cleaning the first blanket cylinder 13 is wound.
And the cleaning cloth 54 unwound from the unwinding shaft 542.
The winding shaft 543 for winding the cleaning cloth 1 and the cleaning cloth 541
Roller 54 for pressing the blanket cylinder 13 of FIG.
4 and a cleaning liquid pipe 549 for discharging the cleaning liquid to the cleaning cloth 541.

FIG. 9 is a plan view showing a part of the unwinding shaft 542 in a state where the cleaning cloth 541 is wound up.

One end of the unwinding shaft 542 has a flange 5
53 is attached. A screw 555 is provided upright at the other end of the unwinding shaft 542, and the screw 555 is configured to be screwed into a screw hole formed in the flange 554. When the cleaning cloth 541 is mounted on the outer periphery of the unwinding shaft 542, the cylindrical cleaning cloth 5 in the wound state is used.
After inserting the unwinding shaft 542 into the core body 556 of 41,
The flange 554 and the screw 555 are screwed together. This allows
The core 556 is held between the pair of flanges 553 and 554. Therefore, the unwinding shaft 542 having the flange portion 553 at one end, the flange portion 554, and the cylindrical cleaning cloth 541 wound around the core body 556 are fixed to each other. In this state, the cleaning cloth 541 is
Through the unwinding shaft 542.

Referring again to FIGS. 6 and 7, the flanges 553 and 554 at both ends of the unwinding shaft 542 are positioned below a pair of left and right support blocks 557 connected to a frame 571 fixed to the main body of the printing apparatus. Supported by
A leaf spring 559 is fixed to the support block 557 with a screw 558. For this reason, the flanges 553 and 554 at both ends of the unwinding shaft 542 are
As a result, the support block 557 is pressed. Thus, the unwinding shaft 542 is rotatably supported by the pair of left and right support blocks 557 while a predetermined braking force is applied.

The take-up shaft 543 is configured to take up the cleaning cloth 541 unwound from the unwind shaft 542 via a core body 561 mounted on the outer peripheral portion thereof. As shown in FIG. 7, one end of the winding shaft 542 is supported by a pair of bearings 562 connected to a frame 571. The other end of the winding shaft 542 is supported by a pair of bearings 563 connected to the frame 571, and is connected to a one-way clutch 564 disposed between the pair of bearings 563. For this reason, the winding shaft 5
43 is supported so as to be rotatable only in one direction (clockwise direction indicated by an arrow in FIG. 6) by the action of the one-way clutch 564.

The end of the take-up shaft 542 on the one-way clutch 564 side is connected to a joint 566 provided on the rotation shaft of the motor 565 via an overload protection member 567. The overload protection member 567 is also referred to as a slipping clutch or the like, and is configured to prevent generation of a torque equal to or greater than a set value by adopting a configuration that idles with a constant torque. For this reason, when the take-up shaft 542 is driven in a rotatable direction (clockwise direction indicated by an arrow in FIG. 6) by driving the motor 565, if a torque greater than a set value is generated in the overload protection member 567. The joint 566 disposed on the rotation shaft of the motor 565 idles with respect to the winding shaft 542.

The set value of the torque by the overload protection member 567 is determined by the support block 557 and the plate spring 559 described above.
It is set to be a value smaller than the braking force applied to 3,554.

Further, as such an overload protection member 567, for example, a torque keeper (trade name) manufactured by Tsubakimoto Chain Co., Ltd. can be used.

The pressing roller 544 is for pressing the cleaning cloth 541 wound around the outer peripheral portion thereof onto the first blanket cylinder 13. This pressing roller 544 is provided in FIG.
As shown in FIG. 7, an arm 545 fixed to a support shaft 547 connected to the printing apparatus main body and capable of swinging about the support shaft 547.
It is pivoted on. Further, an arm 546 whose end is connected to a cylinder rod 569 of an air cylinder 548 fixed to the printing apparatus main body is fixed to the support shaft 547. Therefore, the arm 545 is connected to the air cylinder 548.
Oscillates about the support shaft 547. Along with the swinging operation of the arm 545, the pressing roller 544 comes into contact with the first blanket cylinder 13 via the cleaning cloth 541, and is separated from the pressing position shown in FIG. The robot reciprocates between the evacuation position shown in FIG.

The cleaning liquid pipe 549 is connected to a cleaning cloth 541.
For discharging the cleaning liquid to the The cleaning liquid pipe 549 is fixed to the arm 545, and reciprocates with the pressing roller 544 in accordance with the swing operation of the arm 545. The cleaning cloth 5
A large number of cleaning liquid discharge holes 568 for discharging the cleaning liquid toward 41 are arranged in a row in the axial direction.

As shown in FIGS. 6 and 8, the cleaning cloth 541 unwound from the unwinding shaft 542 comes into contact with the surface of the support shaft 547 and the cleaning liquid pipe 549.
It is wound around the outer periphery of the pressing roller 544, and then forms a stretching path to the winding shaft 543 via the guide rollers 552 and 551. Then, when the pressing roller 544 moves to the pressing position shown in FIG. 8, the extension path length of the cleaning cloth 541 is larger than when the pressing roller 544 moves to the retreat position shown in FIG. 6. Has become.

More specifically, the relative positional relationship between the unwinding shaft 542, the support shaft 547, the guide rollers 551 and 552, and the winding shaft 543 fixed directly or indirectly to the printing apparatus main body does not change. Further, the relative positional relationship between the support shaft 547, the cleaning liquid pipe 549, and the pressing roller 544 connected by the arm 545 does not change. However, the distance between the pressing roller 544 and the guide roller 552 changes due to the reciprocating movement of the pressing roller 544 accompanying the swinging operation of the arm 545 about the support shaft 547.
Along with this, the extension path length of the cleaning cloth 541 changes.

The blanket cylinder cleaning device 29
In, as described later, the unwinding and winding operations of the cleaning cloth 541 are executed by utilizing the difference in the extension path length.

Next, the above-described blanket cylinder cleaning device 2
The cleaning operation of the first blanket cylinder 13 according to No. 9 will be described. This cleaning operation is performed by the control unit 14 described above.
This is executed under the control of 0.

First, the first blanket cylinder 13 is rotated in the manner indicated by the arrow in FIG. 6, and a predetermined amount of the cleaning liquid is discharged from the cleaning liquid discharge hole 568 of the cleaning liquid pipe 568. Further, the arm 545 is swung via the arm 546 by driving the air cylinder 548, and the pressing roller 544 is moved from the retracted position shown in FIG. 6 to the pressed position shown in FIG. Then, the cleaning cloth 541 is pressed against the surface of the first blanket cylinder 13 by the pressing roller 544,
The surface of the first blanket cylinder 13 is cleaned with a cleaning cloth 541.

In addition, with the movement of the pressing roller 544, the distance between the pressing roller 544 and the guide roller 552 increases, and as described above, the extension path length of the cleaning cloth 541 increases. For this reason, tension is applied to the cleaning cloth 541, but the winding shaft 543 rotates only in the direction indicated by the arrows in FIGS. 6 and 8 by the action of the one-way clutch 564, as described above. . Therefore, the unwinding shaft 542 is moved by the tension generated in the cleaning cloth 541 so that the pair of left and right support blocks 557 and the leaf spring 5
The cleaning cloth 541 rotated against the braking force by 59 and wound up by the unwinding shaft 542 is unwound by the difference of the extension path length.

The unwinding amount of the cleaning cloth 541 due to the movement of the pressing roller 544 is always constant.

Next, the arm 545 is swung via the arm 546 by driving the air cylinder 548, and the pressing roller 544 is moved again from the pressing position shown in FIG. 8 to the retracted position shown in FIG. Along with the movement of the pressing roller 544, the distance between the pressing roller 544 and the guide roller 552 decreases, and as described above, the extension path length of the cleaning cloth 541 decreases. Then, at this time, the winding shaft 543 is rotated in a direction indicated by an arrow in FIGS. 6 and 8 by driving the motor 565. As a result, the cleaning cloth 541 is wound around the winding shaft 543 by the difference in the length of the extended path.

At this time, as described above, the set value of the torque by the overload protection member 567 is adjusted by the support block 557 and the leaf spring 559 to the flanges 5 at both ends of the unwinding shaft 542.
It is set to be a value smaller than the braking force applied to 53, 554. Therefore, the rotation of the take-up shaft 543 is controlled by the action of the overload protection member 567 to cause the cleaning cloth 541 to rotate.
Stops when it is wound on the winding shaft 543 by the difference in the extension path length.

Then, a predetermined amount of the cleaning liquid is again discharged from the cleaning liquid pipe 568 and the pressing roller 544 is discharged.
Is moved from the retracted position to the pressed position. As a result, the cleaning cloth 541 is unwound again by the difference of the extension path length.

The above operation is repeated several times while rotating the first blanket cylinder 13 to clean the surface of the first blanket cylinder 13 with the cleaning cloth 541 containing the cleaning liquid. The above operation is repeated several times with the discharge of the cleaning liquid from the pipe 568 stopped. Thereby, the surface of the first blanket cylinder 13 is
It is wrapped by a dry cleaning cloth 541.

By the above operation, the first blanket cylinder 1
When the cleaning of No. 3 is completed, the pressing roller 544 is moved to the retracted position shown in FIG. 6, and the process is completed.

In the embodiment described above, by combining the motor 565 and the overload protection member 567, a constant driving force smaller than the braking force applied to the unwinding shaft 542 is applied to the winding shaft 543. Although the case in which the driving force is applied is described, a configuration in which a constant driving force is applied to the winding shaft 543 using a torque motor or the like that generates a rotational driving force with a constant torque may be adopted.

In the above-described embodiment, the blanket cleaning device 2 for cleaning the first and second blanket cylinders 13 and 14 having a blanket mounted on the outer periphery thereof.
Although the case where the present invention is applied to 9 has been described, the present invention is applied to a cleaning device for cleaning other cylinders used in a printing apparatus such as the first and second plate cylinders 11 and 12 and the impression cylinder 15. It is also possible.

[0073]

According to the present invention, the difference between the length of the cleaning cloth extending when the pressing roller moves to the pressing position and the length of the cleaning cloth extending when the pressing roller moves to the retracted position is used. Since the unwinding and winding operations of the cleaning cloth are performed, a constant amount of the cleaning cloth can always be unwound or wound. For this reason, it is possible to prevent wasteful consumption of the cleaning cloth.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing apparatus to which a blanket cylinder cleaning device 29 according to the present invention is applied.

FIG. 2 is an explanatory diagram showing an arrangement of an image area 67 on a printing plate P.

FIG. 3 is a block diagram illustrating a main electrical configuration of the printing apparatus.

FIG. 4 is a flowchart illustrating an outline of plate making and printing operations performed by the printing apparatus.

FIG. 5 is a flowchart showing a plate making process.

FIG. 6 is a side view showing a main part of the blanket cylinder cleaning device 29 according to the present invention.

FIG. 7 is a plan view showing a main part of the blanket cylinder cleaning device 29 according to the present invention.

FIG. 8 is a side view showing a main part of the blanket cylinder cleaning device 29 according to the present invention.

FIG. 9 shows the unwinding shaft 5 with the cleaning cloth 541 wound up.
FIG. 42 is a plan view showing a part of a part 42 in a cutaway manner.

[Explanation of symbols]

 Reference Signs List 11 first plate cylinder 12 second plate cylinder 13 first blanket cylinder 14 second blanket cylinder 15 pressure cylinder 16 paper feed cylinder 17 paper discharge cylinder 20 ink supply device 21 dampening solution supply device 23 plate supply unit 24 Plate discharging unit 25 Image recording device 26 Developing device 27 Feeding unit 28 Paper discharging unit 29 Blanket drum cleaning device 541 Cleaning cloth 542 Unwinding shaft 543 Winding shaft 544 Press roller 545 Arm 546 Arm 547 Support shaft 548 Air cylinder 549 Cleaning liquid pipe 559 Leaf spring 564 One-way clutch 565 Motor 567 Overload protection member P Printing plate

Claims (1)

[Claims] 1. A cleaning device for cleaning a cylinder of a printing apparatus in which the cleaning cloth is brought into contact with the cylinder of the printing apparatus, wherein a long cleaning cloth for cleaning the cylinder is wound around an outer peripheral portion thereof. An unwinding shaft, an unwinding shaft support mechanism rotatably supporting the unwinding shaft with a braking force applied, a winding-up shaft for winding up the cleaning cloth, and rotating the winding-up shaft in only one direction. A take-up shaft supporting mechanism that supports the take-up shaft; a rotation drive mechanism that rotates the take-up shaft in the one direction with a driving force smaller than a braking force applied to the unwind shaft; A pressing member that presses the cleaning cloth in a spreading path of the cleaning cloth that is taken out and wound on the winding shaft; a pressing position in which the pressing member contacts the body via the cleaning cloth; and a pressing position. Between the evacuation position away from A moving mechanism for moving the pressing member back to the pressing position, wherein the length of the path of the cleaning cloth when the pressing member moves to the pressing position is longer than the length of the path of the cleaning cloth when the pressing member moves to the retracted position. A cylinder cleaning device for a printing apparatus, wherein the pressing member is arranged so as to be large.