JPH11207926A - Gripping device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gripping device for a printer for effectively cleaning an outer periphery of an impression cylinder by an impression cylinder cleaning unit with a simple constitution. SOLUTION: A pedestal 153 of the gripping device 83 has a holding part 151 formed so as to be substantially in plane with a surface of an impression cylinder 15, and a retreating recess part 152 formed as an oblique surface adjacent to the part 151. A gripping pawl 154 of the device 83 has a pawl 155 for sandwiching an end of a printing sheet between the part 151 of the pedestal 13 and the part 151 in contact via the sheet. A shaft 156 of the pawl 154 is attached to a position eccentrically deviated from its shaft core to a driven gear 163. Accordingly, if the gear 163 is rotated, the shaft 156 at the pawl 154 is moved at the shaft core of the gear 163 as a center. Thus, the overall pawl 154 is retracted toward an interior of the cylinder 15 from the vicinity of the surface of the cylinder 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device for a printing press used for mounting a sheet such as printing paper on an outer peripheral portion of an impression cylinder.

[0002]

2. Description of the Related Art For example, in an offset printing machine,
By rotating the blanket cylinder with the ink transferred to the surface from the printing plate mounted on the plate cylinder and the impression cylinder with the printing paper mounted on its outer periphery in a state in which they are in contact with each other, Printing is performed by transferring an image with ink onto printing paper attached to the outer peripheral portion.

[0003] In such a printing machine, a gripping mechanism is used to mount printing paper on the outer peripheral portion of the impression cylinder. This jaw mechanism has a pedestal, and a jaw that abuts on the nip portion of the pedestal via the printing paper, and clamps an end of the printing paper between the jaw portion and the jaw. ,
The printing paper is configured to be mounted on the outer peripheral portion of the impression cylinder.

On the other hand, in a printing machine having such a gripping mechanism, an impression cylinder cleaning device for automatically cleaning the impression cylinder may be used. Such an impression cylinder cleaning device,
A configuration in which the surface of the impression cylinder is cleaned by rotating the impression cylinder while the cleaning cloth for cleaning the impression cylinder is in contact with the surface of the impression cylinder, and sliding the cleaning cloth against the surface of the impression cylinder. Having.

At this time, since the above-mentioned jaws are arranged on the surface of the impression cylinder, when the surface of the impression cylinder is cleaned by the above-mentioned impression cylinder cleaning device, the cleaning cloth contacts the jaws. Doing so causes a problem of being damaged.

[0006] For this reason, for example, in Japanese Patent Publication No. 7-39175, a blade for pressing the cleaning cloth against the impression cylinder is separated from the surface of the impression cylinder in the vicinity of the gripping mechanism to thereby provide the cleaning cloth. To prevent contact with the jaws, thereby preventing damage to the cleaning cloth.

[0007]

However, as described in JP-B-7-39175, a blade for pressing the cleaning cloth against the impression cylinder is provided near the gripping mechanism from the surface of the impression cylinder. In the case of adopting a configuration in which the blades are separated from each other, a structure for moving the blade is complicated.

In addition, in the vicinity of the gripping mechanism on the surface of the plate cylinder, there is a portion where the surface of the plate cylinder does not come into contact with the cleaning cloth, which causes a problem that cleaning of the surface of the plate cylinder becomes insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure, and a cleaning device for a printing press capable of reliably cleaning the outer periphery of an impression cylinder by an impression cylinder cleaning device. The purpose is to provide.

Further, as described in, for example, Japanese Patent Application No. 7-283894 filed by the applicant of the present invention, in a printing machine for making a plate on an impression cylinder, a grip for holding a printing paper. A sheet-shaped photosensitive material is mounted on the outer peripheral portion of the impression cylinder using an apparatus, and processing is executed by bringing a roller containing a processing liquid into contact with the sheet-shaped photosensitive material. As described above, when processing is performed by bringing a roller into contact with a sheet-like photosensitive material mounted on the outer peripheral portion of the impression cylinder, there is a problem that the roller comes into contact with the jaw device and the roller is easily damaged. Occurs.

According to the present invention, when processing is performed on a sheet-shaped photosensitive material by bringing a roller containing a processing liquid into contact with the sheet-shaped photosensitive material mounted on the outer peripheral portion of the impression cylinder, Another object of the present invention is to provide a gripper for a printing press that can prevent the roller from being damaged due to contact with the gripper.

[0012]

According to a first aspect of the present invention, there is provided a pedestal having a holding portion formed so as to be substantially flush with a surface of an impression cylinder, and a pedestal having a holding portion and a sheet in the pedestal. A gripping mechanism having a claw means for gripping the end of the sheet between the gripping portion and the retraction mechanism for retracting the gripping mechanism from the surface of the impression cylinder toward the inside thereof; It is characterized by having.

According to a second aspect of the present invention, in the first aspect of the present invention, the pedestal has an evacuation recess formed adjacent to the holding portion on the side of the claw mechanism in the holding portion, The retracting mechanism is configured to move the claw means such that a tip portion of the claw means contacts the recess for retraction.

According to a third aspect of the present invention, in the first aspect of the present invention, the pedestal has an evacuation recess formed on a side of the holding portion, and the evacuation mechanism is a tip of the claw means. The pedestal is moved so that the portion comes into contact with the evacuation recess.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the retracting mechanism moves the pedestal from the position where the holding portion is substantially flush with the surface of the impression cylinder. It is configured to retreat inside.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a printing machine to which the gripping device 83 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 S.

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.

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. A dampening water supply device 21 for supplying dampening water is 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. And a dampening solution supply device 22 for supplying dampening solution to the printing plate. Further, the first plate cylinder 11 moved to the image recording position
Alternatively, around the second plate cylinder 12, a plate supply section 23, a plate discharge section 24, an image recording device 25, and a development processing device 26 are arranged.

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 and the printing paper S supplied from the paper feeding unit 27
, A discharge cylinder 17 wound with a chain 19 for discharging the printed printing paper S received from the impression cylinder 15 to a discharge section 28, and a drum cleaning device 29. Have.

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 discharge section 2 are provided.
4 are arranged.

The leading end of the printing plate pulled out from the plate supplying section 23 is guided by guide rollers and guide members.
The first plate cylinder 11 or the second plate cylinder 12 is held by one of the holding claws. Then, the first plate cylinder 11 or the second plate cylinder 12 is rotated by the drive of the plate cylinder rotating mechanism, and the printing plate is wound around the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. Then, the rear end of the printing plate cut by the cutter is held by the other holding claw. In this state, the image recording device 25 rotates the first plate cylinder 11 or the second plate cylinder 12 at a low speed, and
The surface of the printing plate held on the outer periphery of the first or second plate cylinder 12 is irradiated with a modulated laser beam to record an image.

The printing plate P mounted on the outer periphery 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 that has 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 (when collectively referred to as “ink supply device 20”) has a plurality of ink rollers 68 and ink fountains 69.

The ink rollers 68 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.
By contacting the ink roller 68 of the ink supply device 20a or 20b 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 68 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 68 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.

Before the fountain solution supply devices 21 and 22 supply ink to the printing plate P by the ink supply device 20,
The dampening solution is supplied to the printing plate P. Of these dampening water devices 21 and 22, the dampening water supply device 21 dampenes the image areas 67a and 67b in the printing plate P, and the dampening water supply device 22 damps the image regions 67c and 67d in the printing plate P. Supply water.

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 an aperture unit, and is configured to be able to move up and down between a standby position indicated by a solid chain line and a developing position indicated by a two-dot chain 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).

A drum cleaning device 29 disposed between the first and second blanket drums 13 and 14 is a long cleaning device that extends from the unwinding shaft to the winding shaft via a pressing roller. A cleaning liquid is supplied to the cloth, and the cleaning cloth is brought into contact with the first and second blanket cylinders 13 and 14 and the impression cylinder 15 and then slid, thereby causing the first and second blanket cylinders 13 to slide. , 14 and the surface of the impression cylinder 15.

The impression cylinder 15 provided so as to be in contact with 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 gripping device 83 according to the present invention for holding and transporting the leading end of the printing paper S.

The structure of the holding device 83 will be described later in detail.

The paper feed cylinder 16 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper supply cylinder 16 holds the leading end of the printing paper S supplied one by one from the paper supply unit 27 by the reciprocating suction plate 74 to a gripping device 84.
And transported. The leading end of the printing paper S held by the gripping device 84 is held by the gripping device 83 of the impression cylinder 15 when the printing paper S is transferred from the paper feed cylinder 16 to the impression cylinder 15.

The pair of paper discharge cylinders 17 disposed adjacent to the impression cylinder 15 have the same diameter as the impression cylinder 15. This pair of paper discharge cylinders 17 has a pair of chains 19 at both ends.
Are wound, and gripping devices 85 are arranged on connecting members (not shown) that connect the pair of chains 19. The leading end of the printing paper S held by the gripping device 83 of the impression cylinder 15 is held by one of the gripping devices 85 when the printing paper S is transferred from the impression cylinder 15 to the discharge cylinder 17. The printing paper S is a chain 1
The sheet 9 is conveyed onto the sheet discharging section 28 and discharged with the movement of the sheet 9.

The paper feed cylinder 16 is connected to a drive motor 133 via a belt 132. 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, by the driving of the drive motor 133, the paper feed cylinder 16, the impression cylinder 15, the discharge cylinder 17, the first and second blanket cylinders 13 and 14, the first and second plate cylinders 11 and 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 developing device 26, the drum cleaning device 29, the first and second devices via the interface 144.
And a drive circuit 145 for generating a drive signal for a drive unit or the like in a blanking mechanism for the blanket cylinders 13 and 14. The printing apparatus is controlled by the control unit 140, and executes 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 the printing paper S with four color inks of yellow, magenta, cyan, and black.

First, a prepress 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 plate feeding unit 23 and the rear end of the printing plate P cut by a cutter 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 shown by the solid line in FIG. 1 to the developing process position shown by the two-dot chain line, the first plate cylinder 1
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 again to FIG. 4, when the plate making process is completed, a printing process for printing on printing paper S using the printing plate P on the first and second plate cylinders 11 and 12 is executed (see FIG. 4). Step S2). This printing process is performed as follows.

That is, first, each dampening water supply device 21,
22 and each ink supply device 20 are connected to the first and second plate cylinders 1.
The contact is made only with the corresponding image area of the printing plate P held on 1 or 12. Thereby, each image area 67
The dampening solution and the ink are supplied to a, 67b, 67c, and 67d from the corresponding dampening solution supply devices 21, 22 and the respective ink supply devices 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 S is supplied to the paper feed cylinder 16. The printing paper S is passed 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 1
5 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 S held on the outer periphery of the impression cylinder 15 In
In the first rotation, black and cyan inks are transferred, and in the second rotation, magenta and yellow inks are transferred.

In this manner, the leading end of the printing paper S on which printing of four colors has been completed is transferred from the impression cylinder 15 to the discharge cylinder 17. Then, the printing paper S on which the printing of the four colors has been completed is driven by the pair of chains 19 so that the holding device 1
7 and is conveyed to a discharge section 28 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. Then, the printing plate P is discharged into the plate discharge unit 24. I do. 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 to the plate discharging unit 24.

When the printing plate P discharging process is completed, the first and second blanket cylinders 13 and 14 are
Then, the impression cylinder 15 is washed (step S4). When the impression cylinder 15 is washed, the holding device 83 of the impression cylinder 15 is retracted as described later.

When the cleaning of the first and second blanket cylinders 13 and 14 and the impression cylinder 15 is completed, it is confirmed whether or not to perform another printing work (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 68 and the ink fountain 69 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 structure of the gripping device 83 in the above-described impression cylinder 15 will be described. 6 and 7 are schematic side views showing the configuration of the gripping device 83 according to the first embodiment of the present invention.

The holding device 83 has a holding mechanism having a pedestal 153 and a holding claw 154, and a retracting mechanism for moving the holding claw 154 of the holding mechanism from the surface of the impression cylinder 15 toward the inside thereof. It is composed of

The pedestal 153 of the holding mechanism is
Holding portion 151 formed so as to be substantially flush with the surface of
And an evacuation recess 152 formed as an inclined surface adjacent to the holding portion 151. The gripper 154 of the gripper mechanism contacts the gripper 151 of the pedestal 153 via the printing paper S, so that the gripper 154 is in contact with the gripper 154.
1 for holding the end of the printing paper S between
5, a support portion 157 swingable about a shaft 156, and a lever 159 provided with a contact portion 158 at the tip thereof and connected to the shaft 156.

The retracting mechanism includes a driving gear 162 that rotates by driving a motor 161,
2 and a driven gear 163 that meshes. The shaft 156 of the jaw 154 described above is driven by the driven gear 163.
In contrast, the driven gear 163 is provided at a position eccentric from the axis of the driven gear 163.

Therefore, when the driven gear 163 is rotated via the driving gear 162 by the driving of the motor 161, the rotation of the driven gear 163 causes the shaft 156 of the gripper 154 to be centered on the axis of the driven gear 163. As a result, the entire claw 154 retracts from the position near the surface of the impression cylinder 15 shown in FIG. 6 toward the inside of the impression cylinder 15 as shown in FIG. With the movement of the claw 154, the tip of the claw 155 is moved from a position where it comes into contact with the holding portion 151 of the pedestal 153 shown in FIG.
3 is moved to a position where it comes into contact with the evacuation concave portion 152 of FIG.

In the gripping device 83 having such a configuration, when performing a printing operation using the impression cylinder 15,
With the rotation of the impression cylinder 15, the contact portion 158 of the lever 159 of the gripper claw 154 is brought into contact with a cam (not shown), and the claw portion 155 is opened and closed with respect to the holding portion 151 of the pedestal 153. Hold or open the part at the required position.

When the surface of the impression cylinder 15 is cleaned by the above-described body cleaning device 29, the driven gear 163 is rotated via the drive gear 162 by the driving of the motor 161, and the jaw 154 is moved to the position shown in FIG. It is moved from the position shown to the position shown in FIG. As a result, the tip of the claw 155 moves from the position in contact with the holding portion 151 of the pedestal 153 to a position in contact with the evacuation recess 152.

For this reason, in the drum cleaning device 29, the impression cylinder 15 is rotated while the cleaning cloth for cleaning the impression cylinder 15 is kept in contact with the surface of the impression cylinder 15, and the cleaning cloth is
Even when the cleaning cloth is slid on the surface of the hook 5, the cleaning cloth can be prevented from contacting the claw 155 of the jaw 154 and being damaged.

Therefore, as described in, for example, Japanese Patent Publication No. 7-39175, a blade or the like for pressing the cleaning cloth against the impression cylinder 15 is separated from the surface of the impression cylinder 15 near the gripping device 83. Since there is no need to employ a configuration, the structure is not complicated, and a portion where the surface of the plate cylinder 15 does not contact the cleaning cloth is formed near the gripping device 83 on the surface of the plate cylinder 15. Plate cylinder 1
The problem of insufficient cleaning of the surface of No. 5 does not occur.

As described above, the printing apparatus to which the gripping device 83 according to the present invention is applied includes the first and second plate cylinders 1.
After printing an image on a printing plate on which the images held by the images 1 and 12 are not recorded and making a plate, the ink supplied to the printing plate is applied to the impression cylinder via the first and second blanket cylinders 13 and 14. The printing is performed by transferring the image to the printing paper S held by the printer 15. Then, as described above, at the time of plate making, the image recording device 2 is
In the case where the printing plate P on which the image is recorded by the step 5 is developed, the developing unit, the fixing unit, and the squeezing unit are sequentially arranged on the printing plate P rotating together with the first plate cylinder 11 or the second plate cylinder. It is configured to make contact.

Even during such a developing process, the claw 1
By moving the tip of the nozzle 55 from a position in contact with the holding portion 151 of the pedestal 153 to a position in contact with the evacuation concave portion 152, when the developing unit, the fixing unit and the squeezing unit are sequentially brought into contact with the printing plate P, It is possible to prevent the member from interfering with the claw 154.

FIG. 8 is a schematic side view showing a modification of the gripping device 83 according to the first embodiment of the present invention shown in FIGS. 6 and 7. In this figure, the same members as those of the jaw device 83 shown in FIGS. 6 and 7 are denoted by the same reference numerals.

The impression cylinder 15 shown in FIGS. 6 and 7 is configured to hold one printing sheet S on the outer periphery thereof.
A single holding device 83 is provided around the impression cylinder 15. On the other hand, the impression cylinder 115 shown in FIG. 8 is configured to hold three printing papers S on the outer peripheral portion thereof.
Are provided around the mouthpiece.

In the gripping device 83 according to this modification, the drive gear 162 is driven by the air cylinder 164 to rotate around the axis of the impression cylinder 115.
Are engaged with three gear portions 165 formed at the respective positions. For this reason, when the rotating plate 166 is rotated as shown by the arrow in FIG. 8 by driving the air cylinder 164, the driven gears 163 rotate in synchronization with each other via the driving gears 162, and accordingly, 7, the jaws 154 of each jaw device 83 move from the position shown in FIG. 8 toward the inside of the impression cylinder 115.

Next, a second embodiment of the present invention will be described. 9 and 11 are schematic side views showing the structure of the grip device 183 according to the second embodiment of the present invention, and FIGS. 10 and 12 are schematic front views thereof. In these figures, the same members as those of the jaw device 83 shown in FIGS. 6 and 7 are denoted by the same reference numerals.

The gripper 183 according to the second embodiment
A holding mechanism having a pedestal 173 and a holding claw 154;
An air cylinder 175 that reciprocates the pedestal 173 in the gripping mechanism in the axial direction of the impression cylinder 15 (the left-right direction shown in FIGS. 10 and 12).

The pedestal 173 of the jaw mechanism 183 has a holding portion 171 formed so as to be substantially flush with the surface of the impression cylinder 15, and the evacuation recess 1 formed on the side of the holding portion 171.
72. Further, the gripper claw 154 of the gripper mechanism 183 contacts the holding portion 171 of the pedestal 173 via the printing paper S to hold the end of the printing paper S between the holding portion 171 and the holding portion 171. It has a claw 155 and can swing about a shaft 174.

When the printing operation is performed in the gripping device 183 having such a configuration, FIGS.
0, the claw portion 155 of the claw 154 and the pedestal 17
The pedestals 173 are arranged so that the three holding portions 171 face each other. Then, with the rotation of the impression cylinder 15, the claw 154
Is driven by a contact member or the like (not shown) to
Is opened and closed with respect to the holding portion 171 of the pedestal 173 to hold or open the end of the printing paper S at a required position.

When the surface of the impression cylinder 15 is cleaned by the above-described body cleaning device 29, as shown in FIGS. 11 and 12, the pedestal 173 is moved in the horizontal direction shown in FIG. Move. As a result, the tip of the claw 155 is positioned at the evacuation recess 1 of the base 173.
As a result, the jaw 154 moves toward the inside of the impression cylinder 15.

For this reason, as in the case of the first embodiment described above, the cleaning cloth for cleaning the impression cylinder 15 is kept in contact with the surface of the impression cylinder 15 in the cylinder cleaning device 29 while the impression cylinder is kept in contact therewith. Even when the cleaning cloth is slid with respect to the surface of the impression cylinder 15 by rotating the cleaning cloth 15, the cleaning cloth can be prevented from contacting the claw 155 of the gripper 154 and being damaged.

Next, a third embodiment of the present invention will be described. FIGS. 13 and 14 are schematic side views showing the configuration of the jaw device 283 according to the third embodiment of the present invention. In these figures, the same members as those of the jaw devices 83 and 183 shown in FIGS. 7 to 12 are denoted by the same reference numerals.

The grip device 283 according to the third embodiment
A holding mechanism having a pedestal 193 and a holding claw 154;
The eccentric cam 192 for raising and lowering the pedestal 193 in the holding mechanism with respect to the surface of the impression cylinder 15 is provided.

The holding claw 154 of the holding mechanism comes into contact with the holding portion 189 of the pedestal 193 via the printing paper S, so that the printing paper S is held between the holding portion 189 and the holding portion 189.
Has a claw portion 155 for holding the end of the shaft 172, and can swing about a shaft 174. Further, the base 193 of the jaw mechanism is brought into contact with the eccentric cam 192 rotating about the shaft 191, so that the holding portion 189 becomes
It is configured to move from a position substantially flush with the surface of the impression cylinder 15 shown in FIG. 13 to a position sunk toward the inside of the impression cylinder 15 shown in FIG.

In the case of performing a printing operation in the gripping device 283 having such a configuration, the pedestal 193 is disposed at a position where the holding portion 189 is substantially flush with the surface of the impression cylinder 15 as shown in FIG. I do. Then, with the rotation of the impression cylinder 15, the jaw 154 is driven by a hitting member or the like (not shown), and the claw 155 is held by the holding portion 189 on the base 193.
, The end of the printing paper S is pinched or opened at a required position.

When the surface of the impression cylinder 15 is cleaned by the above-described body cleaning device 29, the pedestal 193 is moved by driving the eccentric cam 192 as shown in FIG.
Move to the position shown in. As a result, the jaw 154 moves toward the inside of the impression cylinder 15 in a state where the tip of the claw 155 is in contact with the holding portion 189 of the pedestal 193.

For this reason, as in the first and second embodiments described above, the cleaning cloth for cleaning the impression cylinder 15 is kept in contact with the surface of the impression cylinder 15 in the cylinder cleaning device 29. When the cleaning cloth is slid against the surface of the impression cylinder 15 by rotating the impression cylinder 15 with
4 can be prevented from being damaged by contact with the claw portion 155 of FIG.

In the above-described embodiment, a case has been described in which the printing paper as a sheet is mounted on the outer periphery of the impression cylinder by the gripping device. It is also possible to apply the present invention to a printing apparatus which carries out processing by mounting a photosensitive material described above and bringing a roller containing a processing liquid into contact with the sheet-shaped photosensitive material.

[0082]

According to the first to fourth aspects of the present invention, the pedestal having the holding portion formed so as to be substantially flush with the surface of the impression cylinder, and the holding portion and the sheet in the pedestal are provided. A gripping mechanism having a claw means for gripping the end of the sheet between the gripping portion and the holding mechanism, and a retracting mechanism for retracting the gripping mechanism from the surface of the impression cylinder toward the inside thereof. When the cleaning cloth slides against the surface of the impression cylinder to clean the surface of the impression cylinder, the cleaning cloth prevents the contact between the cleaning cloth and the claw means. The whole can be reliably cleaned.

Also, when the sheet-like photosensitive material mounted on the outer peripheral portion of the impression cylinder is brought into contact with a roller containing a processing liquid to perform processing on the sheet-like photosensitive material, the roller and the edge are also used. It is possible to prevent the roller from being damaged due to the contact with the transfer device.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing press to which a grip device 83 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 schematic side view showing the configuration of the grip device 83 according to the first embodiment of the present invention.

FIG. 7 is a schematic side view showing a configuration of the grip device 83 according to the first embodiment of the present invention.

FIG. 8 is a schematic side view showing a modified example of the grip device 83 according to the first embodiment of the present invention.

FIG. 9 is a holding device 183 according to the second embodiment of the present invention.
FIG. 3 is a schematic side view showing the configuration of FIG.

FIG. 10 is a diagram showing a grip device 18 according to a second embodiment of the present invention;
FIG. 3 is a schematic front view showing the configuration of FIG.

FIG. 11 is a gripper device 18 according to a second embodiment of the present invention.
FIG. 3 is a schematic side view showing the configuration of FIG.

FIG. 12 is a gripper device 18 according to a second embodiment of the present invention.
FIG. 3 is a schematic side view showing the configuration of FIG.

FIG. 13 is a gripper device 28 according to a third embodiment of the present invention.
FIG. 3 is a schematic side view showing the configuration of FIG.

FIG. 14 is a gripper device 28 according to a third embodiment of the present invention.
FIG. 3 is a schematic side view showing the configuration of FIG.

[Explanation of symbols]

 15 Pressure Cylinder 29 Body Cleaning Device 83 Holder 115 Pressure Cylinder 151 Nipping Unit 152 Retraction Concave 153 Pedestal 154 Hook Claw 155 Claw 161 Motor 162 Driving Gear 163 Follower Gear 171 Nipping Part 172 Retraction Depression 173 Base Cylinder 175 183 Holder 189 Holder 192 Eccentric cam 193 Pedestal 283 Holder P Printing plate S Printing paper

Claims (4)

[Claims] 1. A seat having a holding portion formed so as to be substantially flush with a surface of an impression cylinder, and a sheet being held between the holding portion and the holding portion of the base by being in contact with the holding portion via the sheet. A gripper for a printing press, comprising: a gripper mechanism having a claw means for clamping an end; and a retracting mechanism for retracting the gripper mechanism from the surface of the impression cylinder toward the inside thereof. apparatus. 2. The holding device for a printing press according to claim 1, wherein the pedestal has a retreating recess formed adjacent to the holding portion on the side of the claw mechanism in the holding portion, and A mechanism for moving the claw means such that a tip of the claw means contacts the evacuation recess; 3. The holding device for a printing press according to claim 1, wherein the pedestal has an evacuation recess formed on a side of the holding portion, and the evacuation mechanism has a tip portion of the claw means. A holding device for a printing press for moving the pedestal so as to contact the evacuation recess. 4. The holding device for a printing press according to claim 1, wherein the retracting mechanism moves the pedestal into the impression cylinder from a position where the holding portion is substantially flush with the surface of the impression cylinder. Holder of the printing machine to be retracted toward.