JPH02137928A - Sticking device for printing plate - Google Patents

Abstract

PURPOSE: To push a printing plate on the whole peripheral face of a cylinder after sticking by arranging rotatably sticking bars around a roller arranged between the sticking bars during the printing plate is stuck. CONSTITUTION: Two sticking bars 2 arranged in a cylinder cut 1 and grasping the end part ranges of a printing plate to be stuck from the bottom are provided. The outside contours of these sticking bars have the same curvature as the curvature of a cylinder under stuck condition and these sticking bars are separated by a press faces 3 acting to bent edge nails 10 of the printing plate to be stuck. In this case, an elastic hose 7 is inserted between the press face of the sticking bar and the sticking bar itself and the sticking bars are made movable in the sticking direction of the printing plate by two eccentric wheels 11 arranged in recessed parts. Namely, for sticking the printing plate 9 on a cylinder 1, both eccentric wheels 11 are each rotated by 90 deg. by means of a spanner and in this instance, both sticking bars are each rotated by determining the centers around the rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The present invention is characterized in that two clamping rods are provided which are arranged in the cylinder cutout and grip from below the end area l of the printing plate to be clamped; These tensions are such that the outer contour of the bar has the same curvature as the cylinder curvature in the tensioned state, and these tensions are separated by a pressure surface of the bar which acts on a curved edge pawl of the printing plate to be tensioned. In this case, the tensioning is carried out by inserting an elastic hose between the pressing surface of the rod and the tensioning rod itself, and the tensioning is carried out by means of two eccentric wheels arranged in a recess. The printing plate attachment is movable in the direction, and the printing plate attachment for the printing press is a device.

Furthermore, the invention provides a clamping rod which is arranged laterally in the cylinder recess and which grips the end area of the printing plate to be clamped from below; , which in the tensioned state have the same curvature as the cylinder curvature, and these tensions are delimited by pressure surfaces which act on the curved edge tabs of the printing plates to be tensioned, in each case, the tensioning being An elastic hose is inserted between the pressing surface of the rod and the rod itself, and the rod is movable in the direction of the printing plate by means of two eccentric wheels placed in a recess. This is a device for attaching printing plates for printing presses.

Conventional technology Such devices are known in the art.

German Patent Application No. P 3616425.9 describes a printing plate tensioning device, in which the printing plate is tensioned onto a cylinder so that the tensioning is carried out by means of two hydraulic cylinders. Moved.

Additionally, Federal Republic of Germany Patent Application No. P 340176
0.7 and P 3702032.3 (Eng.) describes a device for applying printing plates, in which each printing plate is applied to a cylinder by means of two eccentric wheels. The salary should be changed.

It is a disadvantage of the known devices that due to the very narrow manufacturing tolerances, the manufacturing of these devices requires a lot of effort and therefore a lot of expense. However, the correct application of the printing plate is often not ensured, so that the applied printing plate does not touch the printing cylinder surface exactly, and thus during the printing process there is a trick vibration, which on the other hand The quality of printed products is compromised.

OBJECTS OF THE INVENTION It is therefore an object of the invention to provide a device in which the printing form is pressed onto the entire surface of the cylinder after application.

Structure of the Invention This problem is solved in the first device as follows. That is, the tensioning rods are arranged rotatably around rollers which are arranged between the tensioning rods during the application of the printing plate.

In addition, this problem is solved in the second device as follows. In other words, it is possible for the clamping rod to be pressed onto a rod which has a prismatic outer contour and is connected to a cylinder recess during the clamping of the printing plate.

Example Embodiments of the present invention will be described in detail below with reference to the drawings.

The device according to FIGS. 1 and 2 is arranged substantially in the cylinder recess l and has two tensionings 2 arranged symmetrically with respect to the radial plane, in which the radial The outer end surface has the same curvature as the cylinder curvature in the attached state.

Both tensions are attached to the mutually opposite radially outer edges of the rods.
The tabs bent at an acute angle to the circumferential contour are formed as beak edges with surfaces 3, these tabs converging outwards to form channels 4. .

In the untensioned state of the bar, these tabs adjoin on the sides of the bar facing away from each other an insert piece 5 which is also inserted into the cylinder recess. These inserts, which also have the same outer contour as the cylinder contour, are screwed onto the cylinder. The attachment is between the mutually facing sides of the surface and the base plate 6, which according to the invention is not important, which is screwed to the cylinder.

A roller 8 is arranged. An elastic hose 7 filled with gap-closing material is arranged between the tensioning surface of the tensioning rod 2 and the tensioning rod itself, and this elastic hose is tensioned over the entire length, which is the same as the length of the cylinder. It has one or more openings Z pointing in the direction of the printing plate 9 to be applied. Two eccentric wheels 11 are inserted into the recesses of the insertion piece, each along the entire length of the insertion piece. These eccentric wheels are supported by a wall fixed to the cylinder on one side through an insertion piece l when the rod is attached.

The printing form 9 to be pasted has edge tabs 10 bent at an acute angle in the edge region, which grip the pasting surface from above.

At this time, in order to attach the printing plate 9 to the cylinder l, both eccentric wheels 11 &! , each of which is rotated through 90° by means of a wrench, with both tensioning rods rotating centrally around the rollers.

Starting in the same way by rotating both eccentrics 11 by 90°, each associated tension is simultaneously pressed against the surface 3 by the elastic hose 7 arranged in the channel 4. be pressed against the outer contour of the cylinder. On the outer contour of the slit area f, 11 there is a molded piece 12 which forms an upper boundary for closing the slit. Finally, the gap closure material is forced into the hose and pressed against the molded piece through the opening of the hose. After the drain closure material has hardened, the outer contour of the filled drain is the same as the outer contour of the cylinder.

The device according to FIGS. 3 and 4 is basically the same as the device described above. The crucial difference is that instead of a roller,
The cylinder has a prismatic outer contour and is provided with a rod 8 attached by a screw 6 to the cylinder. eccentric wheel ttyq
When rotated by 0°, both tensions 2 are centered and pressed against the prismatic outer contour of the bar.

[Brief explanation of the drawing]

FIG. 1 is a radial sectional view showing the apparatus according to the invention with rollers between the tensioning bars in the unattached state; FIG. 2 is the same sectional view as FIG. 1; FIG. 3 is a radial cross-sectional view showing the device according to the invention having a bar between bars in the state in which the printing plate is not attached; FIG. Although it is the same sectional view as FIG. 3, it is a diagram showing a state in which a printing plate is attached.

Claims (2)

[Claims] (1) Two tensioning rods (
2) are provided, and the outer contour of these tensioning rods is
It has the same curvature as the cylinder curvature in the stretched state,
and these tensioning rods are each separated by a pressure surface (3) which acts on the bent edge tab (10) of the printing plate to be pasted, with the pressure surface (3) of the tensioning rod being separated from the tensioning rod itself. in which the elastic hose (7) is inserted, and the tensioning rod is connected to two eccentric wheels (7) arranged in the recesses.
11), in which a tensioning device for printing plates (9) for a printing press is movable in the direction of tensioning the printing plates by means of rollers (9) arranged between the tensioning bars during tensioning of the printing plates; 8) A printing plate pasting device, characterized in that it is arranged rotatably around the printing plate. (2) Tensioning rods (2) are provided which are laterally movable in the cylinder recess (1) and grip the end area of the printing plate to be tensioned from below, the outer contour of these tensioning rods being , which in the tensioned state have the same curvature as the cylinder curvature, and these tensioning rods each have a pressing surface (3) acting on a curved edge tab (10) of the printing plate to be tensioned.
), an elastic hose (7) is inserted between the pressure surface of the tensioning rod and the tensioning rod itself, and the tensioning rod is separated by two eccentrics arranged in the recess. In a clamping device for printing plates (9) for a printing press, which is movable in the clamping direction of the printing plates by means of a ring (11), the clamping rods each have a prismatic outer contour during the clamping of the printing plates. and a rod (8) connected to the cylinder notch
A printing plate pasting device, characterized in that it can be pressed on a printing plate.