JPH06286111A - Form plate clamping device in sheet-feed press - Google Patents

Abstract

PURPOSE:To provide a form plate clamping device wherein constitution is simple and control of both stop position for a plate cylinder and power transmission is made easy. CONSTITUTION:A pair of gripper front side clamp device 3 and gripper rear side clamp device 4 are provided in the groove part of a plate cylinder 1. The clamp devices 3, 4 are actuated by clamp cams formed of round bar notching and thereby the front and the rear of a machine plate are clamped and unclamped. The nearly central positions of roller arms 15, 16 provided with rollers 17, 18, 19, 20 on both ends are connected to the end parts of the clamp cams. The head 23 of a pressing cylinder 21 fixed to a frame is detachably provided for these rollers 17, 18, 19, 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed printing machine,
In particular, it relates to a plate clamping device that automatically operates a plate clamp device for attaching a printing plate to a plate cylinder.

[0002]

BACKGROUND OF THE INVENTION In a sheet-fed printing press, it is strongly desired to speed up the plate changing operation in order to shorten the so-called pre-preparation time as much as possible. It is necessary to automate the operation of the plate clamping device for mounting the.

[0003]

2. Description of the Related Art A plate clamping device for operating a plate clamping device is a device for clamping / unclamping a plate clamping device provided on a rotatable plate cylinder from a frame side of a fixed printing machine. Is to be transmitted. Tokkyo 4-6
Japanese Patent Publication No. 915 discloses a configuration in which the power transmission means of the plate clamping device on the frame side is engaged with the clamp arm of the plate clamping device on the plate cylinder side.

[0004]

However, according to the above-mentioned prior art, since the power transmission means of the plate clamping device is of the engagement type, it is necessary to control the posture thereof, and therefore the structure is very complicated. Becomes Further, since it is necessary to properly stop the plate cylinder at a predetermined rotation phase, expensive parts such as servo motors are required.

The present invention has been made in view of the above problems,
An object of the present invention is to provide an improved plate clamping device, the purpose of which is to simplify the configuration and facilitate control of both stop position control and power transmission of the plate cylinder.

[0006]

To this end, the plate clamping device according to the present invention is provided with a pair of gripping side clamp devices (3) and gripping side clamps in the groove (2) of the plate cylinder (1). A device (4) is provided for these clamping devices (3),
(4) is a clamp cam (8), (1
2) to clamp / unclamp the plate edge and plate edge of the printing plate, at the ends of the clamp cams (8), (12), the rollers (17) at both ends,
The roller arms (15) and (16) having (18), (19) and (20) are connected to each other at their substantially central positions, and these rollers (17), (18), (19) and (20) are The pushing cylinder (2
It is characterized in that the head (23) of 1) is arranged so that it can come into contact with and separate from it.

[0007]

Operation: The rotation of the plate cylinder (1) is stopped at the clamping / unclamping phase of each of the plate edge and the plate edge of the printing plate (total of four stop phases), and the pushing cylinder (21). ) Moves forward, and roller arms (15) and (16)
Then press the rollers (17), (18), (19) and (20). According to this, the clamp cams (8) and (12) by the round bar notches are rotated to perform clamping / unclamping, and finally, the head portion (23) of the pushing cylinder (21) is retracted.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a schematic side view showing an embodiment of the plate clamping device according to the present invention, FIG. 2 is a partial front view seen from the right side of FIG. 1, and FIG. 3 is a schematic view showing an operating state of the plate clamping device. FIG. 4 is a side view and FIG. 4 is a schematic cross-sectional view of a plate cylinder having a plate clamp device which is a premise of the present invention.

First, the plate clamping device which is the premise of the device of the present invention will be described with reference to FIG.
A part of the outer circumference of the plate cylinder (1) is cut out in the cylinder axis direction to form a groove portion (2), and a gripper side clamping device () for holding the plate tip of the flexible printing plate in the groove portion (2) 3) and a gripper side clamp device (4) for holding the plate bottom are arranged in pairs, and the plate is wound around the outer periphery of the plate cylinder (1) by these clamp devices (3) and (4). Wear it and apply the appropriate pulling force.

The structure of both clamp devices (3) and (4) is also
As is already known, the gripper side clamping device (3) is basically similar to each other, and the gripping side clamping device (3) will be described. Clamp plates (6) divided into a number of are supported by pins (7) and are arranged so as to be capable of undulating. The clamp plates (6) are formed by cutting a round bar into clamp cams (8). ) To clamp / unclamp the plate tip with the clamp base (5). In addition, as for the gripper side clamp device (4) that holds the plate bottom, the plate tail is inserted between the clamp plate (10) that is openably and closably supported by the pin (9) and the round bar notch. It is clamped by the kunrap cam (12) according to the above. Since the gripper side clamp device (4) needs to apply a tensile force to the printing plate, the clamp cam (12) is rotated to perform a gripping action as well as a pulling action.

As described above, since the clamp cams (8) and (12) having the round bar notches have their own rotation centers, their operation is smooth and the clamping force is extremely stable. Then, as shown in FIG. 2, one end of the clamp cams (8) and (10) is connected to the Oldham joint (1
3) is connected to roller arms (15) and (16) provided outside the bearer (14) outside the plate cylinder (1). As shown in FIG. 1, the roller arm (1
5) and (16) are connected to approximately the center of the Oldham joint (13) and further the ends of the clamp cams (8) and (12), and both ends of the roller arms (15) and (16) are connected to each other.
Roller (17), (1
8), (19) and (20) are arranged.

A pneumatic / hydraulic pushing cylinder (21) is fixedly mounted on the frame (22), and a head (23) of the pushing cylinder (21) which can be moved back and forth is connected to a roller (17). It is possible to separate from (18), (19) and (20).

Next, the operation will be described. The rotation of the plate cylinder (1) is stopped at a total of four phases of clamp / unclamp for each of the plate edge and plate edge of the printing plate. Then, the fixed-side pushing cylinder (21) is actuated, the head portion (23) thereof moves forward, and the roller arms (15), (16) rollers (17), (18) of the yajirobe type are provided.
Press one of (19) and (20). This allows
One of the clamp cams (8) and (12) is normally / reversely rotated and clamped / unclamped.

According to the device of the present invention, the pushing cylinder (2
The flat head (23) of (1) is attached to the rollers (17), (1
8), (19), and (20) have a simple structure, so that the control of the stop position of the plate cylinder (1) can be rough, and above all, a complicated structure such as the conventional engagement type is required. do not do. In addition, since all the work is completed only by the pushing operation (advancing) of the fixed pushing cylinder (21), the power transmission is extremely simple.

[0015]

According to the apparatus of the present invention, the construction and control thereof can be greatly simplified and facilitated, which can greatly contribute to the plate replacement work.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a plate clamping device according to the present invention.

FIG. 2 is a partial front view seen from the right side of FIG.

FIG. 3 is a schematic side view showing an operating state of the plate clamping device.

FIG. 4 is a schematic sectional view of a plate cylinder having a plate clamp device which is a premise of the present invention.

[Explanation of symbols]

 1 plate cylinder 2 groove part 3 gripping side clamping device 4 gripping side clamping device 8 clamp cam 12 clamp cam 15 roller arm 16 roller arm 17 roller 18 roller 19 roller 20 roller 21 pushing cylinder 22 frame 23 head

Claims (1)

[Claims] 1. A pair of gripping side clamping devices (3) and gripping side clamping devices (4) are provided in the groove (2) of the plate cylinder (1), and these clamping devices (3),
(4) is a clamp cam (8), (1
2) to clamp / unclamp the plate edge and plate edge of the printing plate, at the ends of the clamp cams (8) and (12), at both ends rollers (17),
The roller arms (15) and (16) having (18), (19) and (20) are connected to each other at their substantially central positions, and these rollers (17), (18), (19) and (20) are The pushing cylinder (2
A plate clamping device for a sheet-fed printing press, wherein the head (23) of 1) is arranged so that it can come into contact with and separate from it.