The device of the vacuum clamp the printing plate to the film assembly when copying

 

(57) Abstract:

Usage: when the copy printing processes. The inventive device vacuum clamping of the printing form to the film Assembly when copying, comprising a metal frame that holds the tool, clamping rubber Mat and vacuum system, and the retaining means is a Mylar film, a rubber Mat has a flat edge and placed on a soft substrate and around the perimeter of the processing phase has a leaky removable embossed frame size copy of the form. 1 C.p. f-crystals, 2 Il.

The invention relates to the printing industry and can be used in the copy process printing.

The known device used in the copy machines for clamping the printing plate to the film Assembly, described in Y. M. Vorobyev, V. I. Vlasenko "Technique and technology thereform printed forms and methods of their control", ed. DIF, Moscow, 1980, pages 57 and 58. and "Plate", A. C. Fungi, ed. Book 1988, page 234. Device for clamping printing plates to the film Assembly consists of a metal frame with a cover glass, the vacuum system and the rubber Mat with proginiai Mat stacked printed form and film Assembly. The retaining means consisting of a metal frame with a cover slip falls on a rubber Mat with springy bumpers and pressed tightly to him. Between the cover glass and the rubber Mat on which are printed the form and the film Assembly, formed a tight space. When turning on the vacuum pump the air from the sealed space is evacuated, resulting in between the retaining means cover glass and rubber Mat creates a bit of space. Under the influence of atmospheric air pressing on the rubber Mat at the bottom, he begins to snuggle up with the printed form and the film Assembly to the cover glass, and the pressing begins with the periphery of the forms and gradually extends to the center. While the smooth surface of the glass cover and forms on the periphery do not allow air from the Central region to move into the cavity pumping, which creates air bubbles and, as a consequence, there nedoponemanie areas, which reduces the quality of printed forms.

Springing the side of the rubber Mat due to the presence of thermal loads from the light source loses its elasticity and Mat often fails. Thus, defects in the cluster clamp, thereby reducing the quality of the printed forms. The presence of a metal frame with cover glass and the rubber Mat with springy bumpers complicate the design of the device, and the cover glass significantly reduces the passage of ultraviolet rays.

The aim of the invention is to achieve a dense and uniform clamping of the printing form and photo forms, improving the quality of the produced printed forms, simplifying the design and reducing energy consumption.

This objective is achieved in that the retention means, i.e., metal frame, instead of the cover glass is thin Mylar film, and the rubber Mat is made without springing the sides and laid on a soft substrate, for example, of foam rubber.

In Fig. 1 and 2 shows a device for vacuum clamping printing plates and photo forms, views from the side in cross section along a-a and above,

where 1 metal frame, 2 Mylar film, 3 rubber Mat, 4 soft substrate, 5 fitting of the vacuum pump, 6 vacuum pump 7, a removable embossed frame, for example of tubular rubber slightly larger than the size of the printing plate 8 table 9 printed form, film Assembly 10.

The device operates as follows. Meta is the first film 2, stretched on a metal frame 1, when lowering in contact with interchangeable embossed frame 7, stretches and presses the external atmospheric pressure when pumping air from the sealed cavity film Assembly 10 to the printed form 9.

The pressure of the frame 1 on a rubber Mat with 3 soft substrate 4 provides a seal cavity formed between Mylar film 2 and the rubber pad 3. The vacuum pump 6 through the nozzle 5, the pumping of air from the sealed cavity. Under the pressure of the atmospheric air outside due to the pumping of air from the sealed cavity Mylar film 1 first bending in the Central part, pressing forms 9, 10 in the center, and then gradually pushes Vozduh from the centre to the periphery and presses form 9,10 evenly across the surface.

At the same time is pumping air from the space behind the removable embossed frame 7, because it is not sealed. Removable embossed frame can be of different sizes depending on the copied material and is slightly greater than their sizes.

Compared with the prototype of the proposed device is simpler in design, it provides a dense and uniform pressing of the form and photo forms, decrease of selectomatic light compared to the prototype.

1. The device of the vacuum clamp the printing plate to the film Assembly when copying, comprising a metal frame that holds the tool, clamping rubber Mat and vacuum system, characterized in that the retaining means is a Mylar film, with rubber Mat has a flat edge and placed on under a soft substrate and around the perimeter of the processed form has a leaky removable embossed frame size copy of the form.

2. The device according to p. 1, wherein the soft pad is made of foam rubber.

 

Same patents:

FIELD: printing industry.

SUBSTANCE: developing cartridge used with device for image formation comprises body of developing cartridge and handle arranged on one side of upper surface of cartridge body and comprising gripping part, arranged on it so that to form sharp angle with upper surface of cartridge body. Also handle comprises a pair of support parts, passing from surface of body and connected to both sides of gripping part in order to attach gripping part to body of developing cartridge.

EFFECT: device for installation and disconnection of cartridge.

7 cl, 9 dwg

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