JPH0811279A - Etching device for press doubly used as paper plate - Google Patents

Abstract

PURPOSE:To obtain an etching device for a press doubly used as a paper plate wherein operations can be automated, its structure is simple and miniaturized, and it can be easily annexed also to an existing machine. CONSTITUTION:A roller unit 9 having a pair of rollers 10, 11 which are opposed to each other, a shower pipe 20 which is arranged near the roller unit 9 to drip etching solution onto the rollers 10, 11, and an actuator 21 which brings one piece of the roller 10 into contact to a printing plate 2 wound around a plate cylinder 1 by transferring the roller unit 9, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing machine which can be used as both a PS plate made of an aluminum substrate and a paper plate made of a paper substrate as a printing plate, and more particularly to an etching device for the paper plate. Regarding

[0002]

BACKGROUND OF THE INVENTION Offset printing utilizes the property that ink and fountain solution repel each other, to a printing plate on which a lipophilic image area and a hydrophilic non-image area are formed. Ink and dampening water are supplied, the image area where the ink is selectively attached is transferred to the blanket cylinder, and this image area is further transferred to the paper. A PS plate of an applied aluminum base is often used.

However, recently, the required level as a printed matter is not so strict, and in printing a small lot, the base material is water resistant processed paper and plate making is performed by an electrophotographic method, so-called direct printing. Paper plates have come to be used, and this paper plate has an advantage of low plate material cost and plate making cost.

By the way, the printing by the paper plate has a temporary and convenient character which is made between the PS plate and the so-called full-scale printing. There is a strong demand to use the water supply system as it is. However, when using a paper plate,
Unlike the case of the PS plate, it is required to apply a desensitizing treatment by applying an etching solution to the paper plate before starting the printing operation. This is because the print quality will be severely deteriorated if this process is not performed.

[0005]

2. Description of the Related Art In the past, the operator applied the etching liquid to the paper plate by hand just before the printing operation, but this was inefficient.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an etching apparatus for a printing machine that also functions as a paper plate. The purpose of the invention is to automate the work and to simplify the structure. , Small in size, so that it can be easily attached to an existing PS plate dedicated machine.

[0007]

To this end, an etching apparatus for a paper plate / printing machine according to the present invention includes a roller unit (9) having a pair of rollers (10) and (11) facing each other. A shower pipe (20) arranged near the roller unit (9) for dropping the etching liquid onto the rollers (10) and (11) and the roller unit (9) are moved to the plate cylinder (1). Actuator (21) for bringing one roller (10) into contact with the wound printing plate (2)
And are included.

[0008]

The etching liquid is dripped from the shower pipe (20) to the rollers (10) and (11) immediately before the printing operation with the paper plate is started, and the roller unit (9) moves the plate cylinder (9) by the actuator (21). It is moved in the direction of 1). Then, one roller (10) is brought into contact with the printing plate (2) to rotate integrally with the rotation of the plate cylinder (1), and the etching liquid diffused between the rollers (10) and (11) is printed. It is applied to the plate (2).

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of an etching apparatus of a paper plate / printer according to the present invention, FIG.
1 is a front view from the direction of arrow II in FIG. 1, FIG. 3 is a plan view of the same, and FIGS. 4 and 5 are enlarged side views of main parts.

A printing plate (2) is wound around the outer periphery of the plate cylinder (1) of the offset printing machine, and ink is supplied to the printing plate (2) by an inking roller (3).
The dampening water stored in the water boat (4) is attached via the water source roller (5) and the swimsuit roller (6). The apparatus of the present invention is such that when the printing plate (2) is a paper plate, the etching liquid is further applied to the printing plate (2).

As shown in FIG. 3, a pair of left and right frame members (7)
A pair of rubber rollers (10) and a pair of metal rollers (11) are rotatably supported by a roller unit (9) formed as one frame by a bar (8) and the like. That is, the rubber roller (10) is closer to the plate cylinder (1),
Further, a metal roller (11) is disposed in contact with the rubber roller (10), and these rollers (10), (1
Both ends of 1) are freely supported by the frame member (7). The rubber roller shoes (12) provided at both ends of the rubber roller (10) are used as the plate cylinder (1).
When it comes into contact with the bearers (13) on both ends of the rubber roller (10), the rubber roller (10) and the metal roller (1
It is for rotating 1) as a driven rotation. Further, reference numeral (14) indicates a tray for receiving the excess etching liquid, and the tray (14) is also integrated with the roller unit (9). And the whole roller unit (9) is
It is mounted on a support bar (16) supported between the left and right side walls (15) of the printing machine and is movable in the direction of the plate cylinder (1).

A pair of rollers (10), (11) facing each other
In order to supply the etching solution to the printer, the etching solution stored in a tank (17) arranged at a high position of the printing machine is guided by a pipe (18) and passes through a valve (19) electromagnetically controlled. It reaches the shower pipe (20). This shower pipe (20) has rollers (10), (11) near the roller unit (9).
Is extended in parallel with and both ends thereof are fixed to the support bar (16). Innumerable fine holes are bored in the lower part of the shower pipe (20), and when the valve (19) is opened, the etching solution is gravity-dripping, so that the rollers (10), ( 11) Sprayed on the surface.

An actuator (21) consisting of an air cylinder is fixed to the support bar (16), and the tip of the actuator (21) is fixed to the roller unit (9).
Connected to the bar (8). Therefore, the roller unit (9) is moved forward and backward by the operation of the actuator (21), and the rubber roller (10) is brought into contact with and separated from the printing plate (2) as shown in FIGS. 4 and 5.

Next, the operation will be described. When a paper plate is used as the printing plate (2), the valve (19) is opened and the etching liquid is supplied to the shower pipe (20). It is sprayed from the pipe (20) and sprayed on the pair of rollers (10) and (11). Then, when the actuator (21) is operated, the roller unit (9) moves forward to move the roller (1) as shown in FIG.
0) contacts the printing plate (2), the roller shoe (12) contacts the bearer (13) of the plate cylinder (1), and the rubber roller (10) and the metal roller (11) are driven to rotate. In accordance with this, the etching liquid is changed to the rubber roller (10).
The plate is moved to the printing plate (2) and subjected to etching treatment. After the work is completed, the actuator (2
By 1), the roller unit (9) is pulled back and the roller (10) is separated from the printing plate (2).

[0015]

According to the etching apparatus of the present invention,
There is a significant effect that the work can be automated by attaching it to an existing printing machine in a small space.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of an etching apparatus of a printing machine also serving as a paper plate according to the present invention.

FIG. 2 is a front view from the direction of arrow II in FIG.

FIG. 3 is likewise a plan view.

FIG. 4 is an enlarged side view of a main part, showing a state before the movement of the roller unit.

FIG. 5 is likewise an enlarged side view of a main part, showing a state after the roller unit is moved.

[Explanation of symbols]

 1 plate cylinder 2 printing plate 9 roller unit 10 rubber roller 11 metal roller 17 tank 19 valve 20 shower pipe 21 actuator

Claims (1)

[Claims] 1. A pair of rollers (10), (1) facing each other.
A roller unit (9) having (1) and rollers (10), (11) arranged near the roller unit (9).
A shower pipe (20) for dripping the etching solution onto the
An actuator (21) for moving a roller unit (9) to bring one roller (10) into contact with a printing plate (2) wound around a plate cylinder (1). Etching equipment.