JPH01242251A - Tightly clamping apparatus for printing plate - Google Patents

Abstract

PURPOSE:To largely take the involving quantity of a printing plate, by mounting clamping pins moving in a radius direction in printing plate involving shafts and opposing said clamp pins to make it possible to bring both of them into contact with each other in synchronous relationship. CONSTITUTION:Printing plate involving shafts 16, 17 are angularly positioned so that the trimming-off surfaces 16b, 17b thereof are opposed mutually and one side end of a printing plate 12 is inserted in an opening part 13 and the other end part of the printing plate 12 is inserted while the printing plate is wound. Next, when a printing plate driving apparatus is rotated in the direction shown by an arrow, clamp pins 18, 19 are brought into contact with both end parts of the printing plate 12 and further draw in both ends of the printing plate 12 while they are respectively pushed back against springs 24, 25. Since a flange part 18c is brought into contact with the flat part of a printing plate involving shaft 16 at the stroke ends of the clamp pins 18, 19, the movement of the clamp pins 18, 19 is stopped and printing plate involving shafts 16, 17 stop rotation in a state well-balanced with the clamping force of the printing plate 12 to finish the clamping of the printing plate 12. By this method, the draw-in length of the printing plate 16 is largely taken.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plate clamping device for a plate cylinder of a printing press, and more particularly to a plate clamping device for a plate cylinder that enables automatic plate conversion.

[Prior Art] The present applicant previously filed Japanese Patent Application No. 63-12245. An application was filed for the name ``Print plate tightening device.'' In this application, two parallel elongated holes are drilled symmetrically around the opening groove provided in the plate i14, and a printing plate winding shaft is rotatably inserted into the elongated holes. forming a scraped surface in the longitudinal direction of the opposing surfaces, respectively;
After inserting both ends of the printing plate into the scraping surface, the printing plate winding shaft was rotated to tighten the printing plate.

[Problems to be Solved by the Invention] Conventional IT origination has the following technical problems. After inserting both ends of the printing plate into the opening groove, when tightening the printing plate, the upper end of the scraping section grips the printing plate and rotates, and shortly after that, the cylindrical part of the printing plate take-up shaft ′! There was a technical problem in that the tightening and tightening b were not sufficient and it was not possible to perform one-minute tightening because the two were in contact with each other.

The printing plate tightening device of the present invention has been made in view of the problems mentioned above, and one object thereof is to provide a printing plate tightening device that can increase the amount of rolled-up portion of the printing plate. .

[L stage for solving the problem] In order to solve the problem L, the present invention has the following means.

An open groove is formed in the longitudinal direction of the plate IH, an elongated hole is bored parallel to the opening groove, a printing plate take-up shaft is inserted into the elongated hole for rotation, and the printing plate is inserted into the groove. This is a plate tensioning device that tightens the printing plate by inserting the head and the end of the grip and winding the first plate winding shaft. Two parallel elongated holes are bored, a plate winding shaft is rotatably inserted into the elongated hole, a scraping surface is formed in the longitudinal direction of the opposing surfaces of the 31i11 plate winding shaft, and the same forming a plurality of holes linearly in the radial direction on the scraped surface, and movably supporting the clamp piece in the holes;
An elastic body is inserted between the large bottom part and the bottom part of the clamp piece to press the clamp piece outward, so that the clamp piece is always suppressed in the diametrically outward direction. A stopper was provided to restrict movement of the piece in the radial outward direction.

Furthermore, the increased surface J:, the total length of the part is in the radial direction,
A movable clamp piece is provided, and an elastic body is inserted to press the clamp piece outward, so that a large amount of retraction of the printing plate can be achieved by the action of the clamp piece. There is.

As this elastic body, a nupling, a pneumatic cylinder, or a pneumatic cylinder can be used. The clamp piece is configured such that its movement is regulated by a stopper and is moved in the radial direction by a guide portion provided on the clamp piece.

[Effect] Next, the operation of the printing plate tightening mechanism will be explained.

First, the phase of the plate take-up shaft is adjusted via a pair of gears fixed to the ends of the plate take-up shaft that mesh with each other so that the scraped surfaces of the plate take-up shaft face each other.

Next, insert the gripping head of the printing plate into the opening groove in the gap between the scraped surfaces, wrap the printing plate around the plate cylinder, and open it at the end. Rotate the shaft together, hold the head in your mouth,
At the same time, pull the butt in your mouth and tighten the printing plate.

At this time, first, the tips of the clamp pieces work together to grip the head,
While holding the ends of the plate in your mouth and making contact with each other, both ends of the printing plate are drawn into the inner side of the plate IH.

At this time, the clamp piece moves while being pushed toward the center of the plate cylinder, and eventually the flange of the clamp piece and the surface of the plate take-up shaft come into contact, and the plate take-up shaft rotates further, resulting in high rigidity. Able to tighten the printing plate.

[Example] Hereinafter, an example of the present invention will be described with reference to one drawing.

1, 2, and 3 show partial cross-sectional views of plate winding shafts 16, 17 provided in plate 13411, respectively.

As shown in FIGS. 1, 2, and 3, the plate ff411 has parallel long holes 14 drilled symmetrically around the opening groove 13.
．． 15, and rotatable plate winding shafts 16 and 17 are fitted into the elongated holes 14 and 15. Printing plate winding shaft 1B, 1
Gears 18 and 19 (not shown) mesh with both ends of the plate 7, respectively, to enable the plate winding shafts 16 and 17 to rotate in opposite directions.

Further, at both ends of the plate cylinder 11, a plate winding shaft 16 or 17 is provided.
A plate clamping mechanism (not shown) is provided which exclusively rotates either one of the plates by an angle of α degrees.

Next, the structure of the printing plate winding shafts 16 and 17 will be explained. In addition, since the plate winding shafts 16 and 17 are symmetrical in shape,
Here, for convenience of explanation, the printing plate winding shaft 16 will be explained based on the sectional view shown in FIG. 4.

In the figure, the Atsushi 1 version winding shaft 16 has a scraped surface 16a, 1
6b, a flange portion 18c for stopping the movement of the clamp pin is formed at the tip thereof, and a hole portion 23 for movably supporting the clamp pin 18 is formed, and the clamp pin 18 is moved in the radial direction. It supports the ability to move i+).

The clamp pin 18 includes a stop groove 18a and a flange portion 18c extending in the axial direction of the side surface. Further, the movement of the clamp pin 18 in the axial direction is restricted by the small end portion 22a of the set screw 22 screwed into the screw holes 21 provided on the side of the plate winding shaft 16 and the end of the stop groove 18a. It consists of

A spring 24 is held between the bottom 18b of the clamp pin 18 and the bottom 23a of the hole 23, so that the clamp pin 18 is always pushed up 1-x.

As shown in the front view of FIG. 5, the printing plate winding shaft 11 has
A plurality of clamp pins 18 are arranged at equal intervals along the axial direction, and the clamp pins 18 and 19 are arranged to face each other.

The top surface of the clamp pins 18, 19 has fine irregularities and is wear resistant. Clamp pin 18
．． In order to improve the wear resistance of 19, clamp pin 18.19
The top surface of
(T-material and diffusion bonding treatment) A material whose surface has been hardened after sandblasting, or a material whose surface has been treated by brazing a cemented carbide with an uneven surface, etc. is used.

Next, the operation of this embodiment will be described.

First, by using a plate drive mechanism (not shown), the plate winding shafts 16, 17 are brought into the state shown in FIG.
Position b so that they face each other.

In this state, both ends of the printing plate 12 can be received.
One end of the printing plate 2 is inserted into the opening 1:1 part I3, and the other end of the printing plate 12 is inserted while wrapping the printing plate 12. At this time, it may be pressed by a longitudinal roller of a robot (not shown).

Next, when the plate drive device is rotated in the direction of the arrow in FIG. While being pushed back, both ends of the printing plate 12 are pulled in. Since the lateral force applied to the clamp pins 18, 19 is received by the side surface of the hole 22 that supports the clamp pins 18, 19, the clamp pins 18, 19 can be stably supported.

At the end of the stroke of the clamp pin 18.19, the flange portion 18c of the clamp pin 18.19 comes into contact with the flat portion 16b of the first plate winding shaft 16, so that the clamp pin 18.19 stops moving, and the printing plate winding shaft 16°I7 stops rotating in a state balanced with the tightening force of the printing plate 12 LI L , and the plate 12 is tightened. In addition, the Y-most stop position of the clamp pin 18 and 19 tips is as follows.

Since it is located near the center of the printing plate winding shafts 16 and 17, a stable and rigid clamping force of 1 Ft can be applied.

As another embodiment of the clamp pins 18 and 19, as shown in FIG. The bottom surface 27a of the attached hole 27 is pushed outward in the radial direction by the spring 28, and loosely engages the clamp pin 26.
This is an example in which the protruding position of the clamp pin 26 is regulated by a bolt 29 screwed into the plate winding shaft 16.

7, the clamp pin 26 is attached to the printing plate I21. By rotating the printing plate winding shaft 16 through the mechanism described in the first embodiment, the gripping end and the gripping head of the 11al IW 12 are drawn into the plate cylinder 11 at the same time. , before the retraction is completed, the bottom part 26a of the clamp pinot 26 and the stepped stepped part 27b
contact, and the lateral force applied to the clamp pin 26 is received by the side surface 27c of the stepped hole 27, so a highly rigid clamping force can be obtained.

[Effect of the invention 1] Compared to the conventional plate take-up shaft, the present invention incorporates a clamp pin that moves in the radial direction in the plate take-up shaft, and allows the clamp pins to face each other and come into contact with each other synchronously. As a result, the printing plate can be pulled in a large length, and the printing plate can be tightened reliably.

In addition, in the past, the plate was wound up at the plate insertion edge in the axial direction of the plate take-up shaft, which added twist to the plate take-up shaft and resulted in uneven tightening of the plate. Since a plurality of pins are arranged independently in a straight line, and the tips of the clamp pins are rounded or spherical, the printing plate can be pushed and pulled in with uniform force.

[Brief explanation of the drawing]

The drawings all show embodiments, and FIGS. 1 to 5 show the first embodiment. FIGS. 1, 2, and 3 are partial cross-sectional views showing the vicinity of the printing plate winding shaft of the plate cylinder, and show the winding order of the printing plates. FIG. 4 shows a cross-sectional view of the printing plate winding shaft in the cross-section taken along line xx in FIG. 5. FIG. 5 shows an IF view of the printing plate winding shaft. FIG. 6 shows a sectional view of another embodiment of the plate winding shaft. 11... Plate cylinder, 12... Printing plate, 13... Opening groove,
14.15... Elongated hole, 16a, 16b... Scraping surface, 16.17... Printing plate winding shaft. 18.19... Clamp pin, 18a... Notch groove,
20...1 top screw, 22.23...hole.

Claims (1)

[Claims] An opening groove is formed in the longitudinal direction of the plate cylinder, an elongated hole is bored parallel to the opening groove, and a plate winding shaft is rotatably inserted into the elongated hole.
A printing plate tightening device that inserts a gripping head and a gripping tail of a printing plate into the groove and winds up the printing plate winding shaft to tighten the printing plate against the plate cylinder, the plate tightening device comprising: Drill two parallel elongated holes symmetrically on the left and right around the opening groove provided in the body,
A printing plate winding shaft is rotatably inserted into the elongated hole, and a scraping surface is formed in the longitudinal direction of the opposing surfaces of the printing plate winding shaft, and a scraping surface is formed in the radial direction on the upper surface of the scraping surface. A plurality of holes are formed in a straight line toward each other, a clamp piece is movably supported in the hole, and an elastic body is inserted between the bottom of the hole and the bottom of the clamp piece to constantly press the clamp piece in the radial direction. What is claimed is: 1. A printing plate tightening device, further comprising a stopper for restricting movement of said clamp piece in a radial direction.