JPH05134326A - Copying camera - Google Patents

Abstract

PURPOSE:To provide a diffusion transfer system copying camera in which a photosensitive material does.not clog in a guide member by simple structure. CONSTITUTION:In the copying camera by which the photosensitive material where a latent image is formed by exposing the plane image of an original is carried along the guide member consisting of an upper plate and a lower plate, superposed on an image receiving material and put in developer and the latent image of the photosensitive material is diffused and transferred on the image receiving material, the guide member 9 is constituted of a horizontal part 9A, an oblique part 9B and a curved part 9C connecting the horizontal part 9A and the oblique part 9B and expansion is given to a gap between the upper plate 91 and the lower plate 92 of the curved part 9C so that the photosensitive 4 material can be loosenend at the curved part 9C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffusion transfer type copying camera used for producing a master block.

[0002]

2. Description of the Related Art A diffusion transfer type copying camera exposes a flat image of an original on a photosensitive material called negative paper to form a latent image, and the exposed photosensitive material receives an image receiving material called positive paper. Are superposed on each other, and this is put in a developing solution to diffuse and transfer the image recorded on the photosensitive material to the image receiving material. In order to form a latent image on the photosensitive material, the type of imaging a document by copying camera, must be without distortion can accurately record up large document about A ₃ size, and have a scaling function Therefore, the copying camera becomes very large and heavy.

Therefore, a diffusion transfer type copying camera, which is schematically shown in FIG. 2, has been used. To explain this, the upper surface of the casing 10, for example up to A ₃ platen 11 clear glass of the document 50 can be mounted in size and is located, has become tabletop. An exposure unit 20 having a built-in light source lamp 21 is arranged immediately below the platen 11 so as to be movable at a variable speed V from the standby position. The exposure unit 20 moves from the standby position, scans and exposes the entire surface of the document 50, and the reflected light of the document 50 is emitted in the horizontal direction by the mirror M ₁ in the exposure unit 20. The reflected light of the document 50 reflected by the mirror M _{1 is} at half the speed of the exposure unit 20.
Is reflected by mirrors M ₂ and M ₃ that move in the same direction as lens 4
The light incident on 0 and emitted from the lens 40 is reflected by the mirrors M ₄ and M ₅
And is then reflected by the plane mirror M ₆ to form an image on the photosensitive material 60 that moves in the horizontal direction at a speed V ₀ .

The photosensitive material 60 has a photosensitive layer adhered to the surface of a support made of paper or film. When exposed as described above, a latent image of the original 50 is formed on the photosensitive layer.
The photosensitive material 60 is stored in a magazine 61 in a roll shape, but is fed horizontally by a conveyance roller group 63 along a guide member (not shown), cut into a predetermined length by a cutter 62, and cut into a sheet shape. become. Next, the image receiving material 70
Is an image receiving layer adhered to the surface of a support made of paper or film, and the exposed photosensitive material 60 is conveyed obliquely downward along the guide member to be superposed on the image receiving material 70, and is placed in the tray 80. After entering the developer, squeeze roller
It is crimped at 81. In this developer, the latent image on the photosensitive layer is developed into blackened silver, while the silver halide in the unexposed area is converted into a water-soluble silver salt and diffuses into the image receiving layer of the image receiving material 70. Then, the silver salt in the image receiving layer is reduced by the developing solution to form a black silver image. In other words, the image of document 50 is
And the image receiving material 70 and the photosensitive material 60 are taken out from the outlet 12.

As described above, the surface of the original placed on the transparent glass original table is scanned while being exposed in a slit shape by the exposure unit from below, and the light reflected from the original is exposed on the photosensitive material through the lens. By doing so, the device is simple and can be downsized, and can be duplicated as if copying. Further, in order to have the reduction / enlargement function, the ratio of the optical path length from the original to the lens and from the lens to the photosensitive material can be changed, and the scanning speed V of the exposure unit and the feeding speed V _{0 of the} photosensitive material.
The ratio of is adjustable.

[0006]

In such a copying camera, in order to make an accurate copy, the feeding speed V _{0 of the} photosensitive material is required.
Is important, and it is necessary to send at a uniform speed without variation. Therefore, of the plurality of transport rollers 63 arranged, the first roller 63a downstream from the exposure position is a feed speed regulating roller and is accurately driven by a motor different from the other rollers 63. In other words, for the feed speed regulation roller 63a,
The two motors for the other roller 63 drive the roller group, and the other rollers 63 all rotate at the same peripheral speed. Then, the peripheral speed of the roller 63a is made 5 to 10% faster than the peripheral speeds of the other rollers 63, and the photosensitive material 60 is exposed while being pulled by the feed speed regulating roller 63a. When the front end of the photosensitive material 60 is bitten by the roller 63 downstream of the roller 63a, the peripheral speed of the roller 63a is high, so that the photosensitive material 60 loosens in a wave shape between the roller 63a and the downstream roller 63. On the other hand, the guide member arranged between the rollers 63 includes an upper plate and a lower plate, and the photosensitive material 60 passes through a narrow gap between the upper plate and the lower plate. Therefore, when the photosensitive material 60 is loosened, it may be clogged in the guide member.

In view of these circumstances, it is an object of the present invention to provide a diffusion transfer type copying camera which has a simple structure and in which the photosensitive material is not clogged in the guide member.

[0008]

In order to achieve the above object, the present invention provides a photosensitive material on which a latent image is formed by exposing a planar image of a document along a guide member composed of an upper plate and a lower plate. In a diffusion transfer type copying camera, which conveys and superimposes on the image receiving material, puts the photosensitive material and the image receiving material in a developing solution to diffuse and transfer the image recorded on the photosensitive material to the image receiving material, the guide member is a photosensitive material. A horizontal portion that extends in the horizontal direction to expose the image, a diagonal portion that extends diagonally downward to overlap with the image receiving material, and a bent portion that connects the horizontal portion and the diagonal portion. The space between the lower plates is widened, and the photosensitive material can be loosened in the bent portion.

[0009]

In other words, in the bent portion connecting the horizontal portion and the oblique portion of the guide member, since the space between the upper plate and the lower plate is widened, the feed rate regulating roller having a high peripheral speed is provided immediately before the bent portion. If the roller downstream of the feed speed regulation roller is arranged in the oblique portion, the photosensitive material will loosen in the bent portion,
No clogging in the guide member.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an essential part of an embodiment of the present invention. A guide member 9 comprises an upper plate 91 and a lower plate 92, and a photosensitive material passes through a gap between the upper plate 91 and the lower plate 92. The guide member 9 is composed of a horizontal portion 9A, a diagonal portion 9B, and a bent portion 9C. The horizontal portion 9A guides the photosensitive material in the horizontal direction to expose it, and is exposed directly below the exposure guide plate 25. The roller arranged on the downstream side of the exposure guide plate 25 is the feed speed regulation roller 63a, and the other rollers.
Rotates at a faster peripheral speed than 63. The diagonal portion 9B guides the photosensitive material toward the lower image receiving material, and the roller 63 is arranged in the uppermost stream thereof. The bent portion 9C connects the horizontal portion 9A and the oblique portion 9B, and includes an upper plate 91 and a lower plate 9B.
The distance between the two is greatly expanded. And the bent portion 9C
Has no rollers.

When a document is placed on the document table 11 and a copy switch (not shown) is turned on, the photosensitive material guided by the horizontal portion 9A is exposed immediately below the exposure guide plate 25, and the bent portion 9C is exposed. Is guided by the oblique portion 9B and is superposed on the image receiving material. Since the peripheral speed of the feed speed regulation roller 63a is faster than that of the other rollers 63, the photosensitive material is
It is pulled and conveyed at 63a. When the tip of the photosensitive material is bitten by the most upstream roller 63 of the oblique portion 9B, the bited portion is conveyed at a low peripheral speed of the roller 63. That is, although the photosensitive material is pushed from the rear portion at a high speed, the speed of the front portion is low, so that the photosensitive material bends in a wavy shape in the bending portion 9C. However, the upper plate 91 and the lower plate 9C of the bent portion 9C
Since the interval of 2 is widened, the photosensitive material can be smoothly conveyed without being clogged in the guide member 9.

[0012]

As described above, in the diffusion transfer type copying camera of the present invention, the space between the upper plate and the lower plate is widened at the bent portion connecting the horizontal portion and the oblique portion of the guide member. Since the photosensitive material can be loosened, the photosensitive material can be prevented from being jammed in the guide member with a simple structure, and can be smoothly transported.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a diffusion transfer type copying camera.

[Explanation of symbols]

 9 Guide member 9A Horizontal part 9B Oblique part 9C Bent part 10 Casing 11 Document table 20 Exposure unit 21 Light source lamp 40 Lens 50 Document 60 Photosensitive material 63 Conveying roller 63a Feeding speed regulation roller 70 Image receiving material 91 Upper plate 92 Lower plate

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Jiro Ikeo, 262 Kondo, Tatebayashi, Gunma Gunma Ushio Electric Co., Ltd.

Claims (1)

[Claims] 1. A photosensitive material having a latent image formed by exposing a planar image of a document is conveyed along a guide member composed of an upper plate and a lower plate and superposed on the image receiving material, and the photosensitive material and the image receiving material are developed. In a diffusion transfer type copying camera for diffusing and transferring an image recorded on a photosensitive material in a liquid to an image receiving material, the guide member includes a horizontal portion extending in a horizontal direction for exposing the photosensitive material, and an image receiving material. It consists of a slanted part that extends diagonally downward to overlap with each other and a bent part that connects the horizontal part and the slanted part.In the bent part, the distance between the upper plate and the lower plate widens, and the photosensitive material loosens in the bent part. A copying camera that is capable of