JPS614036A - Photographic device of daylight copy camera - Google Patents

Abstract

PURPOSE:To easily attach and detach a contact screen in daylight by exposing a photosensitive material while clamping its tail end part with photosensitive material feeding and discharging rollers, and maintaining the light-shield state of a photographic part even when the contact screen is taken out. CONSTITUTION:When the contact screen 6 is loaded, the handle 39 of a light shield base frame 9 is held and opened upward as shown by an arrow A, and the contact screen 6 is set on a platen 5. Then, when the light shield base frame 9 is closed, the contact screen 6 is clamped between a couple of upper and lower rollers 12 as a light shielding means to shield the space covered with the platen 5 and light shield cover sheet against light. Then, a knob 36' as an adjusting means is operated to lift up a frame member 8 and the photosensitive material 1 is fed onto the contact screen 6 through the feeding and discharging rollers 11; and then the knob 36' is operated to lower the frame member 8 and light shield cover sheet 7, and the contact screen 6 and photosensitive material 1 are brought into contact on the platen 5.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention is directed to a bright room which is configured to perform line drawings such as characters and halftone photographs such as patterns on the same photosensitive material in a bright room. Regarding the photographing device of an indoor copying camera, more specifically, in the case of halftone photography, a roll-shaped photosensitive material housed in a light-tight cassette is mounted on the base of the photographing section to form an imaging surface. The present invention relates to a photographing device for a photocopying camera for a bright room, in which a contact screen and a contact screen are placed on top of each other on a transparent platen, covered with a light-shielding cover sheet, and then subjected to close exposure.

<Prior Art> Conventionally, as a plate-making camera for a bright room capable of such line drawing and halftone photography, for example, Japanese Patent Application Laid-Open No. 58-189622 has been used.
A device as shown in FIG. 5, disclosed in Japanese Patent Publication No. 1, is known.

In such a bright room plate making camera, a transparent platen 105 is provided on the base table 104 of the photographing section 103 to form an imaging surface, and a roll film 101 is stored at one end of the base table 104. 104
A film feeding section 102 supported slidably (in the direction of arrow E) is provided above, and the film 101 is advanced and fed between the transparent platen 105 and a light-shielding cover sheet 107 covering the platen 105. The vacuum pump 109 connected to the groove 108 provided around the platen 105 is operated to evacuate the space between the platen 105 and the light-shielding cover sheet 107, and the film 101 is placed on the platen 105.
The film 101 is exposed to light in close contact with the film 101, and the latent image formed on the film 101 is then developed in the processing device 110, thereby making it possible to work in a bright room.

In such a prepress camera, the contact screen 1
06, one end of the contact screen 106 is fixed on the platen 105 with adhesive tape or the like in advance.

<Problems to be solved by the invention> However, in the exposure process using a plate-making camera,
In addition to exposure through a contact screen, it may be necessary to remove the contact screen to perform a screenless highlight exposure, or to multiple-expose another image, such as a line drawing. In this case, the halftone image and the line image must be exposed in their respective predetermined positions, and therefore, before or after halftone exposure, the position of the film 101 is maintained and the contact is removed. It is necessary to remove only the screen 106 and perform line image exposure.

In addition, when creating color separation halftone plates that are separated into the four colors of cyan, magenta, yellow, and black required when creating color printed matter, contact screens with different screen angles are attached and detached for each plate. must,
To this end, an imaging device is required that has a structure that allows the contact screen to be attached and detached easily and quickly in a bright room.

The conventional plate-making camera having a similar structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-189622 does not have a photographing device that fully satisfies this need, and in particular, the halftone exposure and line drawing exposure are not the same. This is extremely inconvenient when printing on photosensitive materials and when preparing four-color separation plates.

The present invention has been made in view of the above circumstances, and is configured so that even if the contact screen is attached and detached as necessary, the image exposed on the same photosensitive material does not shift from a predetermined position before and after attaching and detaching the contact screen. Another object of the present invention is to provide a photographing device for a copying camera for a bright room, which has a structure that allows a contact screen to be attached and removed very easily under a bright room.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a light-shielding base frame that can be freely opened and closed with respect to the base as shown in FIGS. A frame member on which a cover sheet is stretched is attached to a required part of the light-shielding base frame, and a light-shielding means for supplying the light-sensitive material to the imaging surface and discharging it as necessary is attached, as well as a light-shielding means for taking out the contact screen. The present invention provides a photographing device equipped with a contact screen, which allows the contact screen to be easily taken out from the photographing section while keeping the interior of the photographing section light-tight.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the apparatus according to the present invention will be described in detail based on the drawings showing one embodiment.

<Embodiment> FIG. 4 is a side view showing an example of a copying camera to which the photographing device according to the present invention can be applied.

In the same figure, reference numeral 21 denotes a base frame, and a dark box 22 is fixed to this base frame 21. On this frame 21, a lens rack 25 to which the dark box 22 is connected via a bellows 24, a light source device 26, and a document rack 27 are slidably mounted.

Furthermore, a mirror 28 is fixed inside the dark box 22,
A photosensitive material such as film, photographic paper, diffusion transfer paper, raw material for direct plate making, and plate material for offset printing is supplied from the cassette 2 to the photographing section 3 provided on the top surface of the dark box 22, and a predetermined document is photographed. The post-processing device 40 is used for development processing.

1 to 3 show the photographing device of the present invention applied to the photographing section 3 of a copying camera as shown in FIG.
A platen 5 made of a transparent glass plate is provided on the base 4 of
An original image is formed on the upper surface of this platen 5.

On one side of the base 4, a photosensitive material 1 is fed onto a platen 5 with the terminal end of the photosensitive material 1 sandwiched, and the photosensitive material 1 on which a latent image has been formed by exposure is discharged to a processing device 40. A pair of sensitive material supply/discharge rollers 11 and 11 are provided for this purpose.

The photosensitive material supply/discharge rollers 11 and 11 are connected to a cassette 2 that stores the rolled photosensitive material 1 by a guide 29, and when the photosensitive material 1 of a required length is sent out from the cassette 2 by the delivery roller 32, The photosensitive material 1 is cut by manually operating a handle 33 of a movable rotary blade type cutter 31 provided near the photosensitive material outlet 30 of the cassette 2.

The feed roller 32 and the feeding roller 11 are configured to be interlocked by a drive device (not shown), and the cutter 31 can also be interlocked if necessary.

In addition, in FIG. 1, the light-shielding base frame 9 is attached to the base 4 so that it can be opened and closed by a hinge 34, and its cross section is formed into a substantially U-shape that opens downward (towards the base 4). has been done. As shown in FIG. 2, this opening 10 is fitted with a frame member 8 having a rectangular cross-section and a light-shielding cover sheet 7 stretched thereon. It is fixed within the opening 10 of the base frame 9, and the opposite side is attached within the opening 10 so as to be movable in the vertical direction as appropriate via adjustment means such as a cam 36, and as described later, If necessary, the space formed by the platen 5 and the light-shielding cover sheet 7 may be adjusted by adjusting means such as the cam 36, for example, by rotating the grip 36', the light-shielding cover sheet on the side to which the photosensitive material 1 is to be supplied is removed. It is configured to lift up Y7 appropriately.

Furthermore, a roller 12 made of an elastic material is provided as a light shielding means when taking out the contact screen 6 on an adjacent side of the light shielding base frame 9 where the sensitive material feeding roller 11 is provided, that is, on the front side of the base 4. A pair of rollers 12 are rotatably disposed within the opening 10 of the light-shielding base frame 9.

The contact screen 6 is attached at its negative side to a screen frame 37 provided with a handle 38. When attaching the contact screen 6, first hold the handle 39 of the light-shielding base frame 9 and follow the arrow A. The screen frame 37 is opened upward and placed on the platen 5 so that it is fixed to the reference side 42 provided on the base 4 as shown in FIG. At this time, the light shielding base frame 9
The hinge is maintained in the open state by a spring member (not shown) provided at the hinge 34.

The operation of the photographing device according to this embodiment will be explained below.

First, the light shielding base frame 9 is opened and the contact screen 6 is placed on the platen 5 from the direction of arrow B.

At this time, the contact screen 6 is placed on the platen 5 while being guided by the lower roller 12 disposed on the base 4, so that the screen frame 37 is aligned with the reference side 42 as described above.
Set it so that it is in contact with and fixed to.

Next, when the light-shielding base frame 9 is closed, the contact screen 6 is held between the pair of rollers 12, which are the light-shielding means, and the space covered by the platen 5 and the light-shielding cover sheet 7 becomes light-tight. In order to improve this light density, for example, as shown in FIG. A dense member 41 may be attached. Next, before placing the photosensitive material 1 on the platen 5'', the frame member 8 on the side to which the photosensitive material 1 is supplied is lifted up by the adjustment means.

Next, the feed roller 32 of the cassette 2 is driven (
At this time, the photosensitive material supply/discharge roller 11 is also interlocked), the photosensitive material 1 is fed to the required length i), and after the feed roller 32 and the photosensitive material supply/discharge roller 11 are stopped, the cutter 31
cut.

When the cutting of the photosensitive material 1 is completed, the photosensitive material supply 1 is further processed.
Exclusion. -511+7) Drive A and photosensitive material 1
9. It is fed onto a contact screen 6 placed on a 5. When the feeding is completed, as shown in FIG. 1, the photosensitive material supply/discharge rollers 11, 11 firmly grip the vicinity of the end of the photosensitive material 1 outside the effective image area, and
This is to prevent positional displacement when taking out the contact screen 6.

Next, the grip 36' of the adjustment means is operated to adjust the frame member 8.
The light-shielding cover sheet 7 stretched over the platen 5 is lowered, and a vacuum suction device such as a vacuum pump (not shown) is driven to evacuate the space surrounded by the platen 5 and the light-shielding cover sheet 7.
The contact screen 6 placed on top and the photosensitive material 1 are brought into close contact.

In this state, first perform halftone exposure for a picture, etc., and then, if line drawings for characters etc. are to be taken on the same sensitive material, before exposure, release the contact state using the vacuum suction device, and hold the contact screen by the handle 38. 6 outside the photographing section 3. At this point, the contact screen 6 is moved by the roller pair 12.
・The light density in the photographing section 3 is not impaired due to the state in which the photosensitive material 1 is held between the ends of the photosensitive material 1, and the terminal end of the photosensitive material 1 is held in the state by the pair of photosensitive material supply/discharge rollers 11 and 11. Therefore, no displacement of the photosensitive material 1 occurs.

Thereafter, the vacuum suction device is driven again to bring the photosensitive material 1 into close contact with the platen 5, and a line drawing is taken.

In this case, it is necessary to mask the areas other than the required area of the pattern original on each original when photographing the above-mentioned image, and the area other than the required area of the line drawing original when photographing the line drawing. However, if the photographing section 3 is equipped with a mask device that can expose only the required portions of the photosensitive material 1, such consideration on the original document is unnecessary.

Further, the photosensitive material supply/discharge rollers 11 and 11 described as the photosensitive material conveying means may not necessarily be used for processing the photosensitive material, since the processing device 40 may be located at a position opposite to that shown in FIGS. It is not necessary to have a configuration that serves both feeding and discharging.

Further, the light shielding means used when taking out the contact screen is not limited to the pair of rollers, but may be a brush-shaped light shielding means, for example.

In the above-mentioned embodiments, when the photosensitive material is fed and placed on the platen, the frame member on which the light-shielding cover sheet is stretched is raised by 97 points by the adjustment means, but this is not necessarily the case. There is no need to lift up the photosensitive material to feed the photosensitive material, and it is also possible to feed and place the photosensitive material on the platen without lifting up the frame member.

In this way, the photosensitive material 1, in which the latent image formed by the halftone exposure and the latent image formed by the line exposure are aligned, is transferred to the photosensitive material supply/discharge roller 11.
The ink is discharged to the processing device 40 by reverse driving of the inverter, and is subjected to development processing.

<Effects of the Invention> According to the present invention, the photosensitive material is configured to be exposed while being held by the photosensitive material supply/discharge roller that feeds and discharges the photosensitive material onto the platen, and a pair of rollers that sandwich the contact screen are used. One side is used as a base, and the other is placed on a light-shielding base frame that can be opened and closed.The contact screen can be pulled out of the imaging area while keeping the interior of the imaging area light-tight. have

(a) The operation of attaching and detaching the contact screen when performing line exposure subsequent to halftone exposure is extremely simple and easy.

(b) The image formed by halftone exposure and the image formed by line drawing exposure are exposed at the same predetermined position on the same photosensitive material in a bright room. Most of the conventional multiple exposure work that has been done can be done in a bright room, which greatly contributes to improving the working environment and protecting the health of workers.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a photographing device according to the present invention, FIG. 2 is a side sectional view of the photographing device according to the present invention, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. FIG. 5 is a side view of a copying camera for a bright room to which the present invention is applied, and FIG. 5 is a front view of a prepress camera for a bright room according to the prior art. DESCRIPTION OF SYMBOLS 1...Photosensitive material, 2...Cassette, 3...Photography part, 4...Base, 5...Platen, 6...
Contacts (clean, 7... Light-shielding cover sheet, 8... Frame member, 9... Light-shielding base frame, 10...
- Light-shielding base frame opening, 11...Sensitive material supply/discharge roller, 1
2... Screen clamping roller pair.

Claims (6)

[Claims] (1) A required length of photosensitive material fed from a light-tight cassette is placed on a transparent platen provided to form an imaging surface in the necessary parts of the base that constitutes the photographing section, and is contacted as necessary. In a photocopy camera for bright rooms that is placed with a screen and exposed after the two are placed in close contact with each other in a light-shielding state, a light-shielding base frame provided on the base so as to be openable and closable, and a light-shielding cover sheet are stretched. It consists of a frame member disposed at a required part of the light-shielding base frame, a sensitive material conveying means provided close to the base, and a light-shielding means for taking out the contact screen, and also when taking out the contact screen. It is characterized by being configured to maintain a light-tight state in the photographing section.
Photographing device for copy camera for bright room (2) A photographing device in a copying camera for a bright room according to claim 1, wherein one side of the frame member is attached to the light-shielding base frame via an adjusting means so that one side of the frame member can move up and down with respect to the base. (3) A photographing device in a bright room copying camera according to claim 1, wherein the photosensitive material conveying means is composed of a pair of rollers, and also serves as feeding and discharging. (4) A photographing device in a copying camera for a bright room according to claim 1, wherein the light shielding means for taking out the contact screen is a pair of rotatably provided rollers. (5) A photographing device in a bright room copying camera according to claim 3, which is configured to sandwich and hold the end of the photosensitive material fed onto the transparent platen. (6) A photographing device in a copying camera for a bright room according to claim 4, wherein one of the pair of rollers is provided on the light-shielding base frame and the other is provided on the base.