JP2645772B2 - Copy camera - Google Patents

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 printing plate and the like, and more particularly to a photosensitive material transporting device built in the copying camera.

[0002]

2. Description of the Related Art In a diffusion transfer type copying camera, a latent image is formed by exposing a planar image of an original to a photosensitive material called negative paper, and an image receiving material called positive paper is formed on the exposed photosensitive material. Are superimposed on each other, and this is put into a developer, and the image recorded on the photosensitive material is diffused and transferred 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 To do so, the copying camera becomes very large and heavy. Therefore, when the surface of a document placed on a transparent glass platen is scanned from below by exposing it in a slit shape by an exposure unit, light reflected from the document is exposed to a photosensitive material through a lens. Is simple and compact, and can be copied as if it were a copy. Also, in order to provide a 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 ratio between the scanning speed of the exposure unit and the feeding speed of the photosensitive material can be adjusted. It is.

[0003]

In such a copying camera, the photosensitive material is housed in a roll in a magazine, and the photosensitive material is pulled out horizontally by a group of conveying rollers, and the length of the photosensitive material is adjusted according to the size of the plate to be manufactured. Then, the photosensitive material cut into a sheet shape by a cutter is exposed while moving in synchronization with the exposure unit. Therefore, the distance between the cutter and the exposure position is at least as long as the length of the largest copy produced by the copying camera. In particular, a copy camera with a reduction / enlargement function is capable of producing a large copy, so that the distance between the cutter and the exposure position is increased. However, since the exposure position is inevitably closer to the center of the copying camera, and the cutter is arranged downstream of the magazine, that is, closer to the center of the copying camera, the lateral width of the copying camera becomes longer. For this reason, it is conceivable that the photosensitive material is slackened in a substantially U-shape between adjacent rollers disposed between the cutter and the exposure position to shorten the distance between the cutter and the exposure position.

However, when the photosensitive material is slackened in a substantially U-shape, when the roller on the downstream side rotates and conveys the photosensitive material to the exposure position, when the photosensitive material becomes straight from the substantially U-shape, The photosensitive material vibrates because it is suddenly strongly pulled. Then, since the vibration propagates to the photosensitive material at the exposure position, the latent image formed on the photosensitive material is disturbed, so that there is a problem that accurate copying cannot be performed. Accordingly, the present invention provides a diffusion transfer type copying camera that can shorten the distance between the cutter and the exposure position and that can copy accurately without causing vibration of the photosensitive material. Aim.

[0005]

According to the present invention, a sheet-like photosensitive material conveyed in a horizontal direction by a conveying roller group is exposed to a slit image of a document, and the exposed photosensitive material is exposed. In a diffusion transfer type copying camera that overlaps an image receiving material on a material and transfers the image recorded on the photosensitive material to the image receiving material,
A means for individually controlling two adjacent rollers on the upstream side of the exposure position in the conveying roller group and a means for moving a guide member between the rollers are provided. When the photosensitive material is caught by the two rollers, The guide member between the rollers is moved, and only the upstream roller is rotated to loosen the photosensitive material between the two rollers in a substantially U-shape. The material is cut, and only the roller on the upstream side is rotated again to remove the photosensitive material from this roller and to hang it.

[0006]

In other words, since the photosensitive material is slackened between two adjacent rollers on the upstream side of the exposure position to form a substantially U-shape,
The distance between the cutter and the exposure position can be shortened by an amount corresponding to the substantially U-shaped photosensitive material. Then, after cutting, only the roller on the upstream side is rotated again to remove the photosensitive material from this roller and hang down, and then the roller on the downstream side is rotated and conveyed to the exposure position, so that the photosensitive material is quietly without vibration. Conveyed. Therefore, the latent image formed on the photosensitive material is not disturbed,
Can be copied exactly.

[0007]

FIG. 1 conceptually shows a diffusion transfer type copying camera. In Figure 1, on 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 is arranged directly below the document table 11 so as to be movable at a variable speed V. The exposure unit 20 is of a two-lamp type equipped with two tube-shaped light source lamps 21 each surrounded by a gutter-shaped mirror 22, and exposes the document 50 in a slit shape. M ₁ is disposed.
Thus, the exposure unit 20 Moving exposed by scanning the entire surface of the document 50, the reflected light of the document 50 is emitted horizontally in the mirror M _1.

The first mirror unit 31 and the second mirror unit 32 have a pair of plane mirrors M ₂ and M ₃ and a pair of plane mirrors M ₄ and M ₅ mounted on a roof at an angle of 45 °. The optical axis is disposed on both sides of the lens 40 in the horizontal direction. Accordingly, the lens optical reflection of the original 50 is reflected by the mirror M ₁ is reflected by the mirror M _2, M ₃ 40
Incident on the lens and exiting the lens 40 are reflected by mirrors M ₄ and M ₅
In reflected to form an image on the photosensitive member 60 further moves in the horizontal direction at a speed V ₀ is reflected by the plane mirror M _6. Here, the first mirror unit 31 moves in the same direction as the exposure unit 20 at a speed of 1/2 V, that is, half the speed of the exposure unit 20, and moves the original 50 with the movement of the exposure unit 20.
The optical path length from to the lens 40 does not change. The initial position of the first mirror unit 31 (position at which the movement starts) and the installation position of the second mirror unit 32 can be changed.
By changing the optical path length from 0 to the lens 40 and from the lens 40 to the photosensitive material 60, the reduction magnification can be set. However, the scaling factor in the direction perpendicular to the scanning of the exposure unit 20 can be set by changing the optical path length from the original 50 to the lens 40 and from the lens 40 to the photosensitive material 60. For the magnification, it is necessary to further adjust the ratio between the scanning speed V of the original 50 and the moving speed V ₀ of the photosensitive material 60. For this reason, the scanning speed V is changed in conjunction with the reduction / enlargement magnification, and the reduction / enlargement magnification in the scanning direction and the direction perpendicular to the scanning are made the same.

The photosensitive material 60 is obtained by attaching a photosensitive layer to the surface of a support made of paper or film. When exposed as described above, a latent image of the document 50 is formed on the photosensitive layer.
The photosensitive material 60 is stored in a magazine 61 in a roll shape, but is sent out in a horizontal direction by a conveying roller group 63 and cut into a predetermined length by a cutter 62 to form a sheet.

Here, the steps from the time when the photosensitive material 60 is pulled out of the magazine 61 to the time when the photosensitive material 60 is exposed will be described with reference to FIGS. Exposure position E downstream from magazine 61
, A roller 63a, a cutter 62, a roller 63b, and a roller 63c are sequentially arranged.
d and a roller 63e. These rollers are individually controlled so that each can rotate independently. A guide member is disposed between the rollers, so that the leading end of the photosensitive material 60 advances along the guide member and is bitten by a downstream roller. Means are provided for moving the guide member 64 between them, so that the guide member 64 can be removed from between the rollers 63b and 63c.

First, as shown in FIG. 2A, the rollers 63a, 63b and 63c rotate, and the photosensitive material 60 is sent to the rollers 63c. Roller 63c is photosensitive material 60
, The roller 63c stops, and the guide member 64 rotates to be removed from between the rollers 63b and 63c as shown in FIG. On the other hand, since the rollers 63a and 63b are rotating, as shown in FIG.
It loosens between U and the roller 63c and hangs down in a substantially U-shape. Then, the advancing distance of the photosensitive material 60 is measured by a sensor (not shown), and when the photosensitive material 60 advances by a predetermined value, all the rollers are stopped, and the photosensitive material 60 is cut by the cutter 62. After a while
As shown in (D), only the roller 63b is rotated again.
As a result, as shown in FIG.
And drop. And the roller 63c, the roller 63d
Then, the rollers 63e are rotated to sequentially expose at the exposure position E. That is, the slit-shaped image of the original 50 is sequentially exposed on the sheet-shaped photosensitive material 60. As described above, since the photosensitive material 60 is slackened in a substantially U shape between the adjacent rollers 63b and 63c, even if the distance between the rollers 63b and 63c is reduced,
The length of the photosensitive material 60 from the cutter 62 to the exposure position E can be sufficiently secured, and the width of the copying camera can be reduced accordingly. Then, the photosensitive material 60 is suspended once after being cut, and then transported to the exposure position E, so that the photosensitive material 60 does not vibrate during transport. Accordingly, the latent image of the document 50 is accurately formed on the photosensitive material 60, and a clear copy image without distortion can be obtained.

Next, the image receiving material 70 is obtained by attaching an image receiving layer to the surface of a support made of paper or film.
The sheet is sent out from the magazine 71 by the conveying roller group 73. Then, the image receiving material 70 is superimposed on the exposed photosensitive material 60 and enters the developing solution in the tray 80 before the squeezing roller 8
Crimped with 1. In this developing solution, the latent image of the photosensitive layer is developed into blackened silver, while the silver halide in the unexposed portion is converted into a water-soluble silver salt and diffused into the image receiving layer of the image receiving material 70. Then, the silver salt in the image receiving layer is reduced by the developer to form a black silver image. That is, the image of the original 50 is copied onto the image receiving material 70, and the image receiving material 70 and the photosensitive material 60 are taken out from the outlet 12.

[0013]

As described above, the diffusion transfer type copying camera of the present invention relaxes the photosensitive material between two adjacent rollers on the upstream side of the position where the slit-shaped image of the document is exposed on the photosensitive material. Then, the photosensitive material is cut into a predetermined length, and the photosensitive material is suspended between the rollers before being conveyed to the exposure position. The distance to the exposure position can be shortened, and the photosensitive material can be gently conveyed to the exposure position. Therefore,
The width of the copying camera is reduced, and an accurate copied image without distortion can be obtained.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a diffusion transfer type copying camera.

FIG. 2 is an explanatory view of a photosensitive material conveying step.

FIG. 3 is an explanatory diagram of a photosensitive material conveying step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing 11 Document table 20 Exposure unit 21 Light source lamp 40 Lens 50 Document 60 Photosensitive material 61 Magazine 62 Cutter 63 Transport roller group 64 Guide member 70 Image receiving material

Continuation of the front page (72) Inventor Katsushi Kabeta 262 Kondo, Tatebayashi-shi, Gunma Gunma Ushio Electric Co., Ltd. (56) References JP-A-3-213842 (JP, A) JP-A-63-254432 (JP, A)

Claims (1)

(57) [Claims] 1. A sheet-like photosensitive material conveyed in a horizontal direction by a conveying roller group is exposed to a slit image of a document, an image receiving material is superimposed on the exposed photosensitive material, and an image recorded on the photosensitive material is received. A diffusion transfer type copying camera for transferring images onto a material, comprising: means for individually controlling two adjacent rollers upstream of the exposure position in the group of conveying rollers; and means for moving a guide member between the rollers. When the photosensitive material is bitten by the two rollers, the guide member between the rollers is moved, and only the upstream roller is rotated to loosen the photosensitive material between the two rollers in a substantially U-shape. After stopping the roller on the upstream side, cut the photosensitive material by a predetermined length,
A copying camera characterized in that only the upstream roller is rotated again to remove the photosensitive material from this roller and cause it to hang down.