JPH1016192A - Common use template clamping apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and rapidly execute plate clamping work without requiring special labor at a time of the mounting of a paper plate by providing a positioning cam setting the initial position related to the split line direction of a plate rear gripper unit to a plurality of positions to the plate rear gripper unit. SOLUTION: The plate head and rear gripper units 2, 3 in a cylinder groove 1 grip a plate and closely bring a printing plate into contact with the outer periphery of a plate cylinder and a spring member 7 always energizes the clamp base 5 of the plate rear gripper unit 3 in the direction of a groove wall 8 and the direction slackening the tension of the printing plate. The positioning cam 16 acting on the groove wall 8 and setting the initial position related to the split line direction of the plate rear gripper unit 3 to the respective positions of a PS plate and a paper plate is provided to the unit 3. The positioning cam 16 can be revolved around a pin 17 and has a ball stopper 19 and the cavity 20 corresponding thereto. Therefore, the clamp work of PS plate/paper plate can be executed by a common apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate clamping device for a printing press, and more particularly to a common plate clamping device which can be used not only for a PS plate but also for a paper plate.

[0002]

2. Description of the Related Art In an offset printing press, a printing plate is wound and stretched around the plate cylinder, and an image is formed by supplying ink and dampening solution to the printing plate. Is transferred to a sheet via a blanket cylinder under pressure.

As a printing plate, an aluminum-based PS plate is usually used. Since the PS plate is based on a thin metal plate, the PS plate has excellent tensile strength. Therefore, even if a tensile force is applied by a plate clamping device that stretches the printing plate onto the plate cylinder, the PS plate hardly deforms. Easy to mount on plate cylinder.

Recently, paper plates made of water-resistant paper have been increasingly used, supported by the advantages of low plate material costs and plate making costs. However, this paper plate has very low tensile strength,
It is easy to stretch and therefore requires special care when it is mounted on the plate cylinder by the plate clamping device.

[0005]

2. Description of the Related Art Heretofore, a dummy PS plate, which is not used for actual printing, is attached to a plate clamping device as a base, and a paper plate is glued thereon.
An additional jig was attached to the plate clamping device for the PS plate each time, and the paper plate was stretched.

[0006]

However, since all the measures require troublesome work, a large number of man-hours are required for the plate clamping work that requires high speed.

[0007] The present invention has been made in view of the above problems,
It is an object of the present invention to provide a common type plate clamping device that can perform a plate clamping operation simply and quickly without requiring extra work when mounting a paper plate.

[0008]

For this purpose, the common plate clamping device according to the present invention acts between the groove wall (8) and the initial plate-holding unit (3) in the initial direction with respect to the dividing line direction. Positioning cam (1) to set the position to multiple positions
6) is provided in the plate edge holding unit (3).

[0009]

When the PS plate is mounted, the positioning cam (16)
Does not work in practice. In other words, the initial position of the plate edge holding unit (3) is originally set for the PS plate.

On the other hand, when a paper plate is mounted, the positioning cam (16) is rotated to set the initial position of the plate edge holding unit (3) to a groove wall having a small amount of movement for tension. The plate is shifted in the direction opposite to that of (8), and then the plate bottom is held and pulled. As a result, the tension applied to the paper plate is extremely small, the elongation is kept to a minimum, and the installation can be performed orderly.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a common type plate clamping device according to the present invention, and FIG.
3 and FIG. 4 are sectional views taken along line III-II of FIG.
It is operation | movement explanatory drawing in an I line sectional drawing.

The cylinder groove (1) is cut out in the cylinder axis direction of the plate cylinder rotating in the direction of the arrow in FIG. 2 (a direction perpendicular to the plane of the paper of FIG. 2 and the vertical direction in FIG. 1). In the body groove (1), a pair of plate tip holding units (2) and plate edge holding units (3) are provided. Then, the printing plate (4) is bitten and pulled by these units (2) and (3), and is closely attached to the outer periphery of the plate cylinder.

[0013] Of these units (2) and (3),
The plate holding unit (2) mainly serves to fixedly hold the plate edge and is not directly related to the present invention. On the other hand, the plate edge holding unit (3) holds the plate edge and pulls it to bring the printing plate (4) into close contact with the outer periphery of the plate cylinder. The present invention relates exclusively to this plate edge holding unit (3).

The clamp base (5) of the plate edge holding unit (3) is a long base extending in the body axis direction. For example, a ridge on the lower surface thereof and a concave groove on the base (6) of the body groove (1). By a known combination such as (not shown), it is possible to slide in the direction of the secant line. Here, the direction of the dividing line is shown in FIG.
4 and the direction perpendicular to the trunk axis direction along the base (6) of the trunk groove (1). Also,
The clamp base (5) is always in the direction of the groove wall (8) by the spring member (7), in other words, the printing plate (4).
Is urged to loosen the tension.

The clamp plate (9) is connected to the pivot (1).
0), the rod-shaped cam (11) is pivotally connected to the clamp base (5) by a tool (not shown) as shown in FIGS. 3 and 4. Raises and lowers the edge of the printing plate (4).
release. The configurations of such a clamp base (5) and a clamp plate (9) are already well known,
Details are omitted.

The bar-shaped cam (11) has a cam surface different from the cam surface which causes the clamp plate (9) to undulate, and acts on the pressing pin (12) to divide the clamp base (5). This results in a movement to the left. That is,
Push pins (1) are provided at a plurality of locations on the clamp base (5).
2), flange member (13), pressing spring (14)
And a stencil means by a combination of the knuckle member (15). The pressing pin (12) is freely inserted into the clamp base (5), and a pressing spring (14) is engaged with the flange member (13) which is in contact with the pressing pin (12). Have been. The right end of the flange member (13) is a ring member (15) having an H-shaped cross section.
It is freely inserted in the center of.

The ring member (15) receives the pressing spring (14) on one side thereof while holding the clamp base (5).
And the other end is in contact with the groove wall (8).

In the state shown in FIG. 3 before the clamp plate (9) is opened and the printing plate (4) is added, the pressing spring (14) of the plate tension means is not functioning effectively, and The base (5) is urged toward the groove wall (8) by a spring member (7).

On the other hand, as shown in FIG. 4, the plate edge of the printing plate (4) is inserted into the clamp plate (9), and the bar-shaped cam (1) is inserted.
When 1) is rotated, the clamp plate (9) is tilted down by one cam surface of the rod-shaped cam (11) to bite the edge of the plate, and the other cam surface pushes the pushing pin (1).
2) is pushed in the direction of the groove wall (8). At this time, the pressing spring (14) is connected to the flange member (13) and the ring member (1).
5), a reaction force is applied to the rod-shaped cam (11), and the entire clamp base (5) is opposed to the groove wall (8) against the urging force of the spring member (7). , Whereby the printing plate (4) is pulled.

While assuming the above-described plate edge holding unit (3), the shared plate clamping device according to the present invention acts between the groove wall (8) as shown in FIGS. Then, a positioning cam (16) for setting the initial position of the plate edge holding unit (3) in the dividing line direction to each position for the PS plate / paper plate is provided in the plate edge holding unit (3). Features. That is, the positioning cam (16) rotatable around the pin (17) has a notch surface (18) in addition to the outer peripheral arc surface, and also has a ball stopper (19) and a corresponding ball stopper. It has a plurality of depressions (20), and such positioning cams (16) are provided at both ends in the body axis direction of the plate edge holding unit (3). Reference numeral (21) indicates a hole for inserting a tool, which is used to rotate the positioning cam (16) with a rod-shaped tool.

FIGS. 5 to 7 show settings for the PS plate, in which the notched surface (18) of the positioning cam (16) comes into contact with the groove wall (8) under the bias of the spring member (7). As defined by the ball stopper (19) and the like. In this case, the plate edge holding unit (3) holds the PS plate (22) from an initial position shifted toward the groove wall (8), and is relatively slid to the left in the drawing by the above-described plate tensioning means. The plate (22) is pulled.

On the other hand, in the setting for the paper plate shown in FIGS. 8 to 10, the arc surface of the positioning cam (16) is defined by the ball stopper (19) or the like so as to abut the groove wall (8). ing. In other words, the plate edge holding unit (3) holds the paper plate (23) from the beginning at the initial position with a small amount of slide, which is shifted to the left of the drawing, and is slid by a very small distance to form the paper plate (23). The tension of 23) is performed.

Since the slide amount is extremely small, the elongation of the paper plate (23) is suppressed to a small amount within an allowable limit.
On the other hand, the original plate clamping operation itself can be performed orderly and quickly.

[0024]

According to the common type clamping device of the present invention, there is a significant effect that the PS plate / paper plate clamping operation can be efficiently performed by the common device.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a common type plate clamping device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, showing a state before plate holding;

FIG. 4 also shows a state after plate addition.

FIG. 5 is a cross-sectional view of a plate waiting state set for a PS plate.

FIG. 6 also shows a plate holding state.

FIG. 7 shows a plate-covered state.

FIG. 8 is a cross-sectional view of a plate waiting state set for a paper plate.

FIG. 9 also shows a plate holding state.

FIG. 10 shows a plate-covered state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body groove 2 Plate holding unit 3 Plate holding unit 4 Printing plate 5 Clamp base 7 Spring member 8 Groove wall 9 Clamp plate 11 Bar cam 12 Pushing pin 13 Flange member 14 Press spring 15 Ring member 16 Positioning cam 18 Notch Surface 19 Ball stopper 21 Tool hole 22 PS plate 23 Paper plate

Claims (1)

[Claims] 1. A pair of plate edge holding units (2) and a plate edge holding unit (3) are arranged in a drum groove (1) of a plate cylinder, and at least a plate edge holding unit (3) among these units. ) Is slidable in the direction of the dividing line of the body groove (1) and urged in the direction of the groove wall (8), and the plate assembling unit (3) is moved in the direction opposite to the groove wall (8). In the plate clamping apparatus of the type in which the plate is slid to pull the printing plate, the plate clamping device acts between the groove wall (8) and the initial position of the plate edge holding unit (3) in the secant direction to a plurality of positions. A common type plate clamping device, characterized in that a positioning cam (16) to be set is provided in the plate edge holding unit (3).