JPS5819544Y2 - Printing machine for photography, ultraviolet printing, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing machine for photography, ultraviolet printing, etc.

Conventional) A wide variety of structures are known for the above-mentioned printing machine, but a typical one is, for example, the Japanese Patent Publication No. 38-20693.
It is introduced in the issue.

Nowadays, in order to improve the adhesion of the film to the stage glass (also known as printer glass), it is now common to have a structure that allows the top surface of the stage glass to be depressurized, but the adhesion is not very good. .

To explain the conventional structure using FIG. 1, 1 is the printing machine main body, 2 is a stage glass arranged on the top surface, 3 is a rubber sheet for film adhesion that covers the stage glass 2, and 3a is the main body of the printing machine. The pressing plate portion 3b is an edge portion.

Reference numeral 3c is a decompression hole, and the space 4 between the sheet 3 and the glass 2 can be brought into a depressurized state by a decompression pump (not shown).

Therefore, when the pressure is reduced, the original film (one or more) and the film layer 5 of the raw film placed on the stage glass 2 are pressed by the suppression plate part 3a pushed from the outside and are brought into close contact with the stage glass 2. I am forced to do it.

However, it has been found that this mechanism for close contact has a decisive drawback.

That is, when the pressure in the space 4 is reduced through the pressure reduction hole 3c, the air between the press plate portion 3a and the film layer 5, and the air between the stage glass 2 and the film layer 5 are reduced to the film layer 5.
It has been found that as air escapes from the periphery, or in other words, "adhesion" begins, a thin layer of air can be trapped in the center.

Therefore, there is a drawback that the image transfer to the raw film is distorted like an out-of-focus photograph.

The purpose of the present invention is to provide a printing machine with a new configuration that prevents air from being trapped.The feature is that the suppression plate part of the film adhesion rubber sheet is formed in two layers. , an air bag made of a soft body connected to a pressurized air supply mechanism is inserted between the two layers of pressing plate parts.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

As shown in the figure, the pressing plate portions 3a and 3'a are formed in two layers.
The layers are integrated at a connecting portion 3d.

There is no need to surround the entire circumference between the two layers, and the airbag 6, which is a soft object, can enter and exit.

The airbag 6 is inserted between the two layers of pressure plate parts 3a and 3'a, the interior 1 of which is communicated with the outside through a pipe 8, and a pressurized air supply mechanism connected to the pipe 8, such as a normal pump ( (not shown) allows pressurized air to be introduced into the interior 1.

In this case, the pipe 8 needs to pass through the pressure plate part 3a in an airtight manner, but this airtight structure may normally be achieved by using (7)-f packing;
It is as shown in the figure.

To explain in reference 1, cut a thread on the outer circumference of pipe 8,
Tighten the O-ring 9 with the nut 10.

There are many similar structures.

Since the present invention is as described above, when the film layer 5 is brought into close contact with the stage glass 2, air is first filled into the interior 1 of the air bag 6 from the pipe 8 by the pressurized air supply mechanism, and thereby the suppression plate Through the portion 3'a, the film layer 5 is brought into close contact with the stage glass 2 from the center part while pushing out the air in the center part, and is brought into an appropriate pressurized state.

Next, the air in the cavity 4 is removed through the pressure reduction hole 3c using a pressure reduction mechanism (for example, a normal pump - not shown), and finally the air in the airbag 6 is released from the pipe 8, and the two-layer pressure plate The film layer 5 is pressed against the stage glass 2 by the portions 3a and 3'a.

Therefore, the air between the suppression plate portion 3'a and the film layer 5,
Each air between the stage glass 2 and the film layer 5,
There is an advantage that there is no confinement at all, and that the image transfer to the raw film can be completely prevented from collapsing.

As a modification of the embodiment, a holding structure for the lower pressing plate part 3'a is often considered, but for example, it may be connected to the edge part 3b, the overall thickness of the film layer,
It is a good idea to attach a "control valve" or "safety valve" to the pipe 8 in order to adjust or keep the airbag pressurization constant as necessary, taking into consideration the area, thickness, strength, etc. of the stage glass. etc.

To give a numerical example for reference, the pressurizing force is 0.0 mm below atmospheric pressure.
The stage glass is approximately 3 to 1.0 atmospheres larger, the width of the stage glass is approximately 80 crrIX 100 cm, the thickness is 5 to 20 mm, and the height of the space 4 is approximately several meters.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional printing machine, FIG. 2 is an explanatory diagram of a printing machine of the present invention, and FIG. 3 is an explanatory diagram of a pipe penetrating structure. In the figure, 1 is the printing machine main body, 2 is the stage glass, and 3
5 indicates a rubber sheet for film adhesion, 5 indicates a film layer, 6 indicates an air bag, and 8 indicates a pipe.

Claims (1)

[Scope of utility model registration request] A printing machine used for photography and ultraviolet printing, etc. is used to form a two-layer suppressing plate part of a rubber sheet for film adhesion covering the stage glass, and between these two layers of pressing plate parts, a pressurized air supply mechanism is connected. A printing machine for photography, ultraviolet printing, etc., characterized by inserting an airbag made of a soft object.