JPS6033008Y2 - Printing machine plate cylinder drum fixing device - Google Patents

Description

[Detailed description of the invention] The present invention is a printing machine that can move the plate cylinder drum up and down with one touch, and can prevent the plate cylinder drum 2 from vertically and horizontally vibrating, thereby drastically reducing printing defects. This invention relates to a plate cylinder drum holding device.

A conventional plate cylinder printing machine will be explained using drawings.

As shown in FIG. 1, in a conventional printing press, ink is taken out from an ink bath 11 by an ink roll 12, the ink is deposited on a screen roll 9, and then deposited on a printing plate attached to the surface of a plate cylinder drum 2. The structure is such that printing is performed by transferring the image onto the surface of a long sheet of paper or the like that passes between the plate drum 2 and the impression drum 8.

In such a printing press, during its operation, the ink roll 12. Screen roll9. Ml'lam2. Although the printing material and the impression drum 8 are in contact with each other and are rotating or moving, when the operation is stopped, the ink adhering to the surfaces of the ink roll 12 and the screen roll 9 may harden. , the printing plate attached to the surface of the plate cylinder drum 2 and the printing material may become adhesively hardened, so when the operation is stopped, the plate cylinder drum 2 should be moved upward as shown by the broken line in FIG. Plate cylinder drum 2 with a printing plate attached to its surface by pushing it up
It is necessary to keep the ink roll 12 and the screen roll 9 out of contact with the screen roll 9 and the printing material, and to keep the ink roll 12 and the screen roll 9 constantly rotating in order to prevent the ink from curing.

As a result, when starting operation, the plate drum 2 is pulled down to bring the printing plate attached to the surface of the plate drum 2 into contact with the screen roll 9 and the printing material, and at the same time, the plate drum 2 is in operation. It is necessary to prevent printing defects from being caused by vertical and horizontal movement due to vibrations, etc., but it is necessary to create a device that can perform such operations reliably, is easy to handle, and is reliable. Due to its lack of existence, various negative effects have arisen.

This invention eliminates these problems and allows the plate drum to be moved up and down with a single touch, while also being able to securely fix the plate drum so that it does not move vertically or horizontally during operation. This invention relates to a plate cylinder drum holding device for a printing press that can drastically reduce printing defects.

In other words, the present invention consists of a plate drum that has a predetermined clearance between it and the impression drum, is pressed by a screen roll, and is rotatably supported by bearing metals that can be divided into two on both sides; A metal holder that can be divided into two parts is fixed to the lower part of the metal holder, and is attached to the printing unit frame so as to be able to slide vertically on the cylinder. A vertically movable rod that engages with a provided counterbore is L-shaped and rotatably pivoted to the printing unit frame at its bent portion, and one end thereof projects from the lower end of the vertically movable rod. An L-shaped arm is engaged with a horizontal elongated hole, one end of which is pivoted to the printing unit frame, and the tip of a piston rod is pivoted to the other end of the vertical arm. This invention relates to a plate cylinder drum holding device for a printing press, characterized by comprising an air cylinder that constantly pulls a rod downward via a sliding arm.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The plate cylinder drum holding device for a printing press according to the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a partially cutaway front view of the first embodiment of the plate cylinder drum holding device for a printing press according to the present invention, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2.

In the drawings, reference numeral 1 denotes a bearing metal that can be divided into two parts, and is used to rotatably support the plate cylinder drum 2 on both sides.

3 is a metal receiver that holds the bearing metal 1, and like the bearing metal 1, it can be divided into two parts.

A printing plate is attached to the plate cylinder drum 2, but when replacing this printing plate, the plate cylinder drum 2 together with the metal support 3 is pushed upward, and the metal support 3 and the bearing metal 1 are each divided into two parts. 2 was removed and replaced.

4 is the main body frame of the printing press; 5 is the main body frame 4
This cylinder is fixed to the printing unit frame 19 mounted on the printer.

Reference numeral 6 denotes a vertically moving rod that is slidably mounted in the cylinder 5 in the vertical direction, and an inclined engagement portion 6a provided at the top of the vertically moving rod 6 is connected to a seat provided at the top of the cylinder 5. It engages with the bore 5a to prevent the vertically movable rod 6 from moving downward and horizontally, and the lower end of the vertically movable rod 6 is provided with a horizontally elongated hole 6b protruding therefrom.

7 is L-shaped, one end of which is the lower end of the vertically movable rod 6, and the other end of which is the piston rod 1 of the air cylinder 10.
0a, and is rotatably pivoted to a printing unit frame 19 attached to the main body frame 4 at a bent portion.
It is a type arm.

By making the length of the arm of this L-shaped arm 7 on the side connected to the vertical movement rod 6 shorter than the length of the arm on the side connected to the air cylinder 10, the vertical movement rod can be used with a relatively small capacity air cylinder. 6 can be constantly pulled downward with great force.

Reference numeral 8 denotes an impression drum, and a clearance 1 is provided between the impression drum 8 and the plate drum 2 at a predetermined interval that matches the printing material, and when the printing material passes through this clearance 1, Printing is applied to the printing substrate.

Reference numeral 9 denotes a screen roll whose cylinder surface is pressed against the surface of the plate cylinder drum 2. The film is attached to the surface of the screen roll 9 through the film.

The ink deposited on the surface of the screen roll 9 is applied to the convex part of the printing plate attached to the surface of the plate cylinder drum 2 at the contact part with the plate cylinder drum 2, and then the plate cylinder drum 2 is coated with the ink. Clearance 1 between 2 and the impression drum 8
At this point, the printing plate surface is pressed onto the printing material with a constant surface pressure, and the printing plate is transferred and printed.

10 is an L-shaped arm 7 with one end and a printing unit frame 1
9 is an air cylinder, and the inclined engagement part 6a provided on the upper part of the vertically movable rod 6 and the counterbore 5a provided on the upper part of the cylinder 5 are engaged with each other with a constant surface pressure. It is for.

The clearance 1 between the plate drum 2 and the impression drum 8 and the pressing force between the plate drum 2 and the screen roll 9 are determined by the engagement position of the vertically movable rod 6. Even if the surface pressure between the cylinder 6a and the counterbore 5a of the cylinder 5 changes, that is, even if the tensile force of the air cylinder 10 changes, the locking position of the vertically movable rod 6 will remain at the inclined engagement portion 6.
The clearance 1 between the printing cylinder drum 2 and the impression cylinder drum 8 is always kept constant by the engagement between the plate cylinder drum 2 and the impression cylinder drum 8 unless the inclined retaining part 6a and the counterbore 5a of the cylinder 5 are separated. Also, the pressing force between the plate cylinder drum 2 and the screen roll 9 can be kept constant at all times.

In addition, the angle θ between the vertical direction and the inclined engaging portion 6a of the vertically movable rod 6 is set to be 30°≦θ≦60′, which is larger than that of the conventional one. The distance between the cylinder 5 and the counterbore 5a can be improved.

It is preferable that the angle θ between the inclined engagement portion 6a and the vertical direction is 45° because the vertical and horizontal component forces of the surface pressure are equal, improving stability against vibrations.

When printing using the plate cylinder drum holding device of the printing press according to the present invention having such a structure, first, the printing plate is attached to the plate cylinder drum 2, and the drum shafts on both sides are connected to the lower metal receiver 3 and the bearing metal. 1, and the upper halves of the bearing metal 1 and the metal receiver 3 are placed thereon and fixed using pins or the like.

After that, the air cylinder 10 is operated to rotate the L-shaped arm 7, which is pivoted to the tip of the piston rod 10a, around the bent part to lower the vertically movable rod 6. The provided inclined engagement portion 6a is engaged with a counterbore 5a provided in the upper part of the cylinder 5.

At this time, the plate drum 2 and the screen roll 9 are pressed together, and a predetermined clearance 1 is provided between the plate drum 2 and the impression drum 8.

When the printing press starts operating in this state, the screen roll 9 is driven by 1/l of the impression drum 8 and plate drum 2.
Because it is a roll, the plate drum 2 is pushed upward and rotated, so it tries to vibrate in the vertical and horizontal directions, but the air cylinder 10 moves the vertical movement rod 6 via the L-shaped arm 7 Since the inclined engagement portion 6a is constantly pulled so as not to separate from the counterbore 5a of the cylinder 5, the clearance l between the plate cylinder drum 2 and the impression cylinder drum 8 and the pressing force between the plate cylinder drum 2 and the screen roll 9 are reduced. It is now possible to operate continuously while keeping the
Printing defects can be drastically reduced.

Furthermore, such an effect is achieved by the slope retaining portion 6 of the vertically movable rod 6.
a and the vertical force angle θ with the counterbore 5a of the cylinder 5
It is also possible to improve the surface separation between the inclined engagement portion 6a of the vertically movable rod 6 and the counterbore 5a of the cylinder 5 by setting the angle in the range of 30° to 60′, which is larger than the conventional one.

The device of the present invention having such advantages has great practical value.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram for explaining the structure of a conventional printing press.
Figure 2 shows the plate cylinder drum holding device of the printing press according to the present invention.
A partially cutaway front view of the embodiment, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2. 1... Bearing metal, 2... Plate cylinder drum, 3... Metal receiver, 4... Body frame, 5... Cylinder, 5a... Counterbore, 6... Vertical movement rod, 6a... Inclined engagement portion, 6b... Elongated hole, 7... L-shaped arm 8 sea 666 impression drum, 9...
・Screen roll, 10...Air cylinder,
10a... Zestone rod, 11... Ink bath, 12... Ink roll, 19...
...Printing unit frame, θ...Angle between the inclined engagement portion and the vertical direction, l...Clearance between the plate cylinder drum and the impression cylinder drum.

Claims (1)

[Claims for Utility Model Registration] 1. A plate which has a predetermined clearance l between it and the impression drum 8, is pressed by a screen roll 9, and is rotatably supported by a bearing metal 1 which can be divided into two on both sides. A body drum 2, a metal receiver 3 that can be divided into two and holds the bearing metal 1, and a metal receiver 3 that is fixed to the lower part of the metal receiver 3 and attached to the cylinder 5 on the ori and the printing unit frame 19 so as to be able to slide vertically. Slanted engagement part 6 at the upper part
8 is a vertically moving rod 6 which is connected to a counterbore 5a provided on the upper part of the cylinder 5, and is L-shaped and rotatably pivoted to the printing unit frame 19 at its bent portion, and one end thereof is connected to the printing unit frame 19. The L-shaped arm 7 is engaged with a horizontal elongated hole 6b projecting from the lower end of the vertically movable rod 6, and one end is pivotally attached to the printing unit frame 19, and the tip of the piston rod is shaped like an L-shaped arm 7. A plate drum for a printing press, comprising an air cylinder 10 which is pivotally attached to the other end of an arm 7 and which constantly pulls the vertically movable rod 6 downward via the sliding arm 7. holding device. 2. Plate cylinder drum holding for a printing press according to claim 1, in which the angle θ formed by the inclined engagement portion 6a of the vertically movable rod 6 with the vertical direction of the slope is in the range of 30° to 60'. Device.