JPH0349877Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to an assembly type plate cylinder structure in a printing press, and in particular to a plate cylinder clamping structure in which a shaftless plate cylinder is easily replaced and is a highly strong assembly type. It is.

[Background of the idea]

The plate cylinder structure in a printing unit such as a gravure rotary press has a shaftless structure in which it is held between a pair of holding bodies, as shown in the sectional view of FIG.
The shaftless structure makes it easier to replace the plate cylinder compared to a shaft-equipped plate cylinder, but since the plate cylinder surface length is designed to match the maximum surface length, the plate cylinder surface length is If is short, 1 protrudes from both sides
Even if the paired plate cylinder clamping bodies are made as narrow as possible, clamping may not be possible. Therefore, there was a problem in that the printing had to be applied to a separately installed printing unit.

Furthermore, even if the pair of plate cylinder holders protruding from the pair of frames slide overhang to hold the plate cylinder, the plate cylinder is pressurized by the impression cylinder located directly above it, so the plate The cylinder clamping body oscillates and rotates, resulting in poor printing accuracy, and there is also the problem that the convex conical surface of the clamping body and the concave conical surface of the plate cylinder are worn out.

FIG. 1 shows the clamping structure of the plate cylinder. Reference numeral 1 denotes a hollow shaftless plate cylinder, and supporting holes 1a and 1b are formed at both ends. 2,2'
3 and 3' are a pair of trapezoidal plate cylinder holders that are fitted into the holes 1a and 1b of the shaftless plate cylinder 1 to hold the shaftless plate cylinder 1; A pair of frames to be attached.

As shown in the figure, the plate cylinder 1 is held between the plate cylinder holders 2 and 2', and by rotating the plate cylinder holders 2 and 2', the plate cylinder holders 2 and 2' move in the direction of the arrow. and is firmly clamped. As mentioned above, if the surface length of the plate cylinder 1 is long, there will be no problem with clamping, but if the surface length is short, the plate cylinder clamping members 2, 2' will be moved further in the direction of the arrow, causing damage to the plate cylinder itself. Shaking also occurs.

[Purpose of the invention] The present invention has been devised in view of the problems of the prior art described above. Even when the length of the plate cylinder surface is shorter than a predetermined dimension, the plate cylinder holding body cannot slide from the frame. The purpose is to firmly hold the plate cylinder without increasing the amount of overhang, eliminate runout of the plate cylinder, and improve printing accuracy.

[Summary of the idea]

The feature of the present invention is that a pair of attachments are interposed between a pair of plate cylinder holding bodies attached to a frame and a shaftless plate cylinder, and a pair of attachments are inserted through the plate cylinder.
A guide shaft is provided that connects both attachments and slides the attachments,
This is because it is configured to hold the plate cylinder.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. In Fig. 2, parts with the same reference numerals as in Fig. 1 have the same functions; , and the clamping holes 1a and 1b of the plate cylinder 1
Attached are hollow, approximately arrow-shaped attachments 4, 4', the other end of which is inserted into.

Also, between the attachments 4 and 4',
A guide shaft 5 passing through the plate cylinder 1 is provided to slide and guide the attachment.
Both plate cylinder clamping bodies are connected. Then, the outer peripheral surface of the guide shaft 5 and the attachment 4,
The structure is such that it is in close contact with the inner wall surface of 4' and does not wobble.

Therefore, when the surface length of the plate cylinder 1 is shorter than that shown in FIG. 1, the guide shaft 5 passes through the plate cylinder 1, and the attachments 4,
4' from both sides, and its attachment 4,
4' and the holes 1a, 1b of the plate cylinder 1 are fitted into the plate cylinder holders 2, 2', and rotate the plate cylinder holders 2, 2' in the direction of the arrow. The plate cylinder clamping bodies 2, 2' are moved to firmly clamp the plate cylinder 1. That is, the position of the plate cylinder clamping body (attachments 4, 4') supported by the frames 3, 3' can be held in the same manner as in the case of a long surface, and the plate cylinder clamping body 2, Since the runout of the plate cylinder 1 can be eliminated, the runout of the plate cylinder 1 is eliminated, and printing accuracy is improved. In addition, since the plate can be set in the same printing machine regardless of the length of the plate cylinder surface, and there is no runout of the plate cylinder, there is less wear around the plate cylinder holding member, which greatly contributes to improving printing accuracy.

[Effect of idea]

As is clear from the above-mentioned embodiments, according to the present invention, a pair of attachments are interposed between a pair of plate cylinder clamping bodies attached to a frame and a shaftless plate cylinder, and a pair of attachments are provided that penetrate through the plate cylinders and connect both plate cylinders. Since the plate cylinder is configured to be clamped by providing a guide shaft that connects the attachments, even if the plate cylinder surface length is short, the plate cylinder can be moved without significantly changing the position of the clamping body. This has the advantage that printing units can be shared, the printing cylinder can be easily replaced, and printing accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view for explaining a plate cylinder support structure in a conventional printing press. FIG. 2 is a partially sectional front view of a plate cylinder support structure showing an embodiment of the present invention. 1... Plate cylinder, 2, 2'... Plate cylinder holding body, 3,
3'...Frame, 4,4'...Attachment,
5...Guide shaft.

Claims (1)

[Scope of utility model registration request] A printing machine in which a shaftless plate cylinder having concave tapered surfaces on the inner surfaces of both ends is held between a pair of clamping bodies supported by a pair of frames and having convex tapered surfaces that engage with the concave tapered surfaces. In the plate cylinder clamping structure, one end has a convex taper surface that engages with the concave taper surface, and the other end has a concave taper surface that engages with the convex taper surface, and the plate penetrates inside. A pair of attachments having holes and a shaft fitted into the through hole are provided, the pair of attachments are engaged with both sides of the shaftless plate cylinder, and the shaft is fitted into the through hole of the attachment, and the shaft is fitted into the through hole of the attachment. A plate cylinder clamping structure for a printing press, characterized in that a shaftless plate cylinder is supported by a clamping body through a pair of attachments.