JPS60154242A - Superposing device of contact printing machine for negative plate and photosensitive material - Google Patents

Abstract

PURPOSE:To prevent the formation of a Newton ring and facilitate superposing operation by superposing a photosensitive material which is sucked to the pressure layer surface of a photosensitive carriage with the emulsion surface out on a negative plate supported at the window hole peripheral edge of a thin plate support frame, and pressing the photosensitive material gently. CONSTITUTION:The rough-surface pressure layer 7 with a low reflection factor which is of nearly the same size with the photosensitive material and made of a soft cushion material such as rubber sponge is stuck on the reverse surface of the photosensitive material carriage 5. Numbers of acetabula 8 which have a lower-end opening surface recessed a little bit below the reverse surface of the pressure layer 7 are embedded at necessary positions of the pressure plate 7, and each acetabulum is connected to a vacuum source through a suction pipe. Then, the photosensitive material 6 held suctionally; by the photosensitive carriage 5 is superposed on the negative plate 4 on the negative plate support frame 1, and the photosensitive material carriage 5 is lowered slightly to allow the negative plate 4 and photosensitive material to curve downward and contact each other tightly, so the photosensitive material is exposed from below. Thus, the superposing operation is facilitated without forming any Newton ring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for polymerizing and bringing an original plate and a photosensitive material into close contact when contact printing a photograph.

(Prior art and its disadvantages) In contact printing, it is necessary to bring the original plate and the photosensitive material into close contact with each other over the entire surface. Generally, the original plate and the photosensitive material are polymerized and pressed between two sheets of transparent glass, etc. ing.

Therefore, when the original plate is a film, Newton's rings often occur between the film surface and the glass plate, and the printing results may be significantly impaired.

In order to prevent Newton rings from occurring, there is a method of spreading a small amount of fine powder between the film surface and the glass plate, but since the fine powder may appear as pinholes on the photosensitive material, It is necessary to spread a very small amount of powder as uniformly as possible, and great care is required in the spreading operation, which results in poor workability.

In addition, when the photosensitive material is a film, there is a method of pressing only the periphery of the polymerized original plate and the photosensitive material using its curl, but since the strength of the curl is not constant, the original plate and photosensitive material are They are often not in close contact over the entire surface, and as a result, the details of the printed image may become blurred and the quality of one image may deteriorate.

(Object of the Invention) The present invention provides an apparatus for polymerizing an original plate and a photosensitive material, which does not require delicate processing such as scattering fine powder during contact printing, and does not cause Newton rings. The purpose is to

(Structure of the Invention) The present invention provides a photosensitive carriage that can receive an appropriate number of suction cups in which the opening surface of the window hole, which has the same shape and size as the effective image area of the original plate, is slightly recessed from the surface of the suppression layer, and the original plate support. The photosensitive material is adsorbed onto the surface of the pressing layer of the photosensitive material carriage, with the emulsion side facing outward, onto the original plate supported around the window hole of the frame, and is then lightly pressed.

(Operations and Effects of the Invention) In the apparatus of the present invention, a glass plate or the like is not used, and during printing, the base film surface of the original plate is in contact with the emulsion surface of the photosensitive material, and the base film surface of the photosensitive material is Since the smooth surfaces are not in contact with the rough adsorption layer and the smooth surfaces are not extremely close to each other, Newton's rings do not occur.
Moreover, the polymerization operation is simple.

Note that when the original plate and photosensitive material are brought into pressure contact with each other, the central part is pushed outward due to the cushioning effect of the adsorption layer, causing it to curve slightly; however, since the original plate is thin, the printed image The negative impact on the results is so slight that it can be ignored.

(First embodiment of the present invention) In FIGS. 1 and 2, (1) is an original plate support frame;
Window hole (z) (7) "Positioned" 7 deep 2" shallow "positioned" on the periphery
(The original plate (4) is supported in the hole (3) with its emulsion surface (4a) facing downward.
The image is set to have the same shape and size as the effective image.

(5) is a photosensitive material carriage, and the photosensitive material (
A rough suppressing layer with a low reflectance made of a soft cushioning material such as rubber sponge, and having approximately the same shape and size as 6).
7) is attached.

At important points of the pressing layer (7), the opening surface at the lower end is connected to the pressing layer (7).
) A number of suction cups (8) are buried slightly recessed from the lower surface of the suction cup (8), and each suction cup (8) is connected to a vacuum source (not shown) through an intake pipe (9).

The photosensitive material (6) is suctioned onto the lower surface of the pressing layer (7) by each suction cup (8) with its emulsion surface (6a) facing downward.

As shown in Figure 3, the original plate (4) on the original plate support frame (1)
Then, if the photosensitive material (6) adsorbed to the photosensitive material carriage (5) is polymerized and the photosensitive material carriage (5) is lowered slightly, the original plate (4) and the photosensitive material (6) will curve slightly downward. Since they are in close contact with each other, they can be exposed from below.

(Second embodiment of the present invention) The original plate support frame (2υ) shown in FIG. The window hole of the first inner frame is 10.2.
It is for X12.7crn (4X5 inches) original plate. Note that (2!9 is a positioning hole).

Figures 5 and 6 respectively show the second inner frame (to) and the third inner frame (2), which have the same outer dimensions as the first inner frame (to), and the second inner frame (to). ) has a window hole C for the 6×6 crn original plate.
In addition, a window hole for a 35fl original plate is provided in the third inner frame.

Note that (31Ca1l is a positioning groove corresponding to the positioning hole (c) above).

According to this second embodiment, by replacing the inner frame t23(a)(2η), it is possible to fit the outer fitting (2η) to original plates of various sizes.
It is convenient because hot water can be shared.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the device according to the invention. FIG. 2 is a central longitudinal sectional front view of the original plate and the photosensitive material when it is supported, and FIG. 2 is a bottom view of the photosensitive material carriage. FIG. 3 is a central longitudinal sectional front view of the original plate and photosensitive material when polymerized, FIG. 4 is a central vertical sectional front view of the original plate support frame in the second embodiment of the present invention, and FIG. FIG. 6 is a plan view showing another example of the inner frame used. FIG. 6 is a plan view showing still another example of the inner frame. (1) Original plate support frame (2) Window hole (3) Positioning hole (4) Original plate (4a) Emulsion surface (5) Photosensitive material carriage (6) Photosensitive material (6a) Emulsion surface (7) Suppression layer (8) Suction cup (9) Intake pipe (2]) Original plate support frame (2 outer frame (2) 1st inner frame t24) Window hole (c) Positioning hole (a) 2nd inner frame (5) 3rd inner frame (to) Window hole (to) 0υ positioning groove

Claims (2)

[Claims] (1) An original support frame with a window hole of the same shape and size as the effective image area of the original, and a flat pressing layer such as a soft cushioning material.
It is similar to a photosensitive material carriage that has an appropriate number of suction cups embedded in key points of the double pressing layer, the openings of which are slightly recessed from the surface of the pressing layer. An original plate in a contact printing machine, in which a photosensitive material adsorbed on the surface of a suppression layer of a photosensitive material carriage with the emulsion side facing outward is polymerized and lightly pressed onto an original plate supported around the window hole of an original plate support frame. Photosensitive material polymerization equipment. (2) The device according to claim 11, wherein the original plate support frame is formed of an outer frame and an inner frame fitted into the outer frame, and the inner frame is provided with a window hole.