JPS631318Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for closely printing a transmission original such as a film onto a plate-making material such as a photosensitive film, resin plate, or metal plate.

Conventionally, a transparent original is aligned on the plate-making material arranged on a printing table, a flexible transparent sheet is covered and sealed, and this is evacuated with a vacuum pump etc. to create a vacuum inside the sheet. A contact printing method is used in which the manuscript is pressed tightly with a squeegee roller from the top of the sheet, and then light is irradiated onto the flexible transparent sheet to perform printing.

The present applicant aims to improve work efficiency by maintaining the adhesion between the plate-making material and the original, and by automatically supplying the plate-making material, making it easier to align the position of the original in the process of printing multiple plate-making materials from the same manuscript. In order to achieve this, we previously proposed in Japanese Patent Application No. 53-49460 that the above-described printing method be performed with the original fixed on a flexible transparent sheet.

Furthermore, the present applicant proposed a contact printing apparatus for carrying out the contact printing method in accordance with the above proposal as U.S. Pat. No. 53-95317. That is, this device locks one end of a flexible transparent sheet fixed to the printing table at a position aligned with the plate-making material arranged on a printing table equipped with a suction means, and the other end is fixed to the printing table through a tensioning means. This is a contact printing device equipped with a squeegee roller that holds the flexible transparent sheet under tension and presses the flexible transparent sheet while moving from one end to the other end to bring the flexible transparent sheet into close contact with the plate-making material.

When the above-described printing method is carried out using this contact printing apparatus, it is desired that exposure be carried out efficiently for the purpose of increasing the efficiency of the work. Generally, in order to perform stable exposure, a shutter-equipped exposure means is used in which a light source is turned on and exposure is performed by opening and closing a shutter. Exposure with the contact printing device described above must be performed after the original adhered to the flexible transparent sheet and the plate-making material arranged on the printing table are firmly in contact with each other, so it is necessary to open the shutter. The operation can be performed in any order since the squeegee roller only needs to spread the flexible transparent sheet over the entire surface of the plate-making material from one end. For example, when using a rotary shutter, the movement of the squeeze roller It can be rotated in either direction. On the other hand, the closing operation of the shutter naturally coincides with the direction of the opening operation of the shutter so that the amount of exposure is uniform at any position on the plate-making material. The squeegee roller is returned to one end side after the shutter has been closed, but in order to shorten the time for the printing process, it is preferable to return the squeegee roller at the same time as the shutter is closed. However, when the squeegee roller returns and the portion where the document is no longer on the plate-making material is exposed, fogging will occur in that portion.

The purpose of the present invention is to provide an efficient contact printing device that can shorten the printing process time by preventing the original from being exposed on the removed plate-making material even if the squeeze roller starts returning at the same time as the shutter starts closing. It is to be.

The present invention has been made to achieve the above-mentioned object.The original is aligned on the plate-making material arranged on the printing table, a flexible transparent sheet is covered and stacked on top of the plate-making material, and then the document is removed by an exhaust means. In a contact printing device in which the inside of a flexible transparent sheet is sealed and the upper part of the sheet is squeezed by a squeegee roller to bring the document into close contact with the plate-making material, the document is stopped at a position aligned with the plate-making material. mounting means for locking one end of the attached flexible transparent sheet to the printing table while holding the other end under tension via a tensioning means; It consists of a squeegee roller that is spread over the entire surface to bring it into close contact with the document and then returns to the one end direction to release the close contact, and an exposure means with a shutter that prints the original onto the plate-making material when the document is brought into close contact, and the shutter of the exposure means is The contact printing apparatus is characterized in that it sequentially exposes and sequentially blocks light from a side opposite to the one end to the one end.

Hereinafter, the present invention will be specifically explained based on the illustrated embodiments.

Figures 1 and 2 are side views showing the main parts of an embodiment of the contact printing device according to the present invention, and Figure 1 shows a flexible transparent sheet being spread over the entire surface of the plate-making material from one end and being tightly attached. Figure 2 shows a state in which the squeegee roller is returned to one end direction and the flexible transparent sheet is removed from the plate-making material as shown by the chain line, and a state in which the squeegee roller is returned to one end direction as shown by the chain line. Indicates a state in progress.

1 and 2, a sheet positioning and fixing means 3 for locking one end of a flexible transparent sheet 2 to which an original 1 is fixed with pressure tape or the like, and a printing table 4 equipped with a suction means (not shown) , a belt 6 equipped with hooks 5 that engage both sides of the flexible transparent sheet 2 whose one end is locked to the printing table 4, a pulley 7 for suspending the belt 6, a set pulley 8, and a movable pulley 9;
A weight 10 suspended from a movable pulley 9, a spring 11 that cushions the end of the belt 6, a flexible transparent sheet 2, and a guide roller 12 that guides the belt 6.
A guide roller 14 and a squeegee roller 15 are movably provided to cover and overlap the flexible transparent sheet 2 onto the plate-making material 13 arranged on the printing table 4, and the original 1 fixed to the flexible transparent sheet 2 is moved. Plate making material 1
The light source device 16 includes a light source device 16 that performs transmission printing on the light source 3;
The light source device 16 consists of a lamp 17, a reflector 18, and a cylindrical rotary shutter 19 with an aperture of 180 degrees.

Next, the handling of the contact printing apparatus configured as described above will be explained. First, the original 1 is fixed to a predetermined position on the flexible transparent sheet 2, that is, a position aligned with the plate-making material 13, using pressure tape, etc., and the guide roller 14 and squeegee roller 15 are moved to A in FIG.
With the flexible transparent sheet 2 moved further to the left than the position shown in FIG. 14 and squeegee roller 15 are set at position A shown by the chain line. When the guide roller 14 and the squeegee roller 15 are operated from the state shown by the chain line, the flexible transparent sheet 2 is supplied to a predetermined position on the printing table 4 and spread out over the entire surface of the plate-making material 13 arranged. to reach position B. At this time, by operating the suction means, the flexible transparent sheet 2 is moved onto the printing table 4.
The document 1 is also brought into close contact with the plate-making material 13 in a vacuum state.
Close contact sequentially. When the close contact is completed, the rotary shutter 19 rotates 180 degrees clockwise from the closed state shown by the chain line to the position shown by the solid line, opens, and exposes the light from the lamp 17. After a predetermined period of time, the rotary shutter 19 rotates 180 degrees clockwise from the open state shown by the solid line to the position shown by the chain line and closes, completing the exposure.
The guide roller 14 and the squeegee roller 15 are
At the same time as the rotary shutter 19 starts the operation to end the exposure from the open state to the closed state, it starts moving from the position B to the position A, and the intermediate state is as shown in FIG. The flexible transparent sheet 2 begins to be removed from the plate-making material 13 before the rotary shutter 19 is completely closed. At this time, the rotary shutter 19 sequentially blocks light from the side opposite to one end, that is, from the right side, so that
The right half of the plate-making material 13 where the original 1 is missing is not exposed to light and does not cause fogging. The rotational speed of rotary shutter 19 and the moving speed of squeegee roller 15 are selected so that the light from lamp 17 does not expose the right side of squeegee roller 15.

In the above embodiments, a rotary shutter was used as the shutter, but any structure that opens and closes sequentially from a fixed direction can be used. Further, if the lamp itself or a part of the reflector has a light shielding function, it may be moved or rotated and used to have a shutter function. In the above embodiment, an example was described in which the squeegee roller 15 starts moving to return at the same time as the shutter 19 starts the operation to end the light shielding. If you start moving, you can achieve the purpose of this invention even to a small extent.

The guide roller 14 is for regulating the wrapping angle of the flexible transparent sheet on the squeegee roller 15 and preventing it from being bent suddenly by the squeegee roller 15. Akira
53-123200 is implemented.

The weight 10 connects the other end of the flexible transparent sheet 2 to the belt 6.
The squeegee roller 15 is used to maintain tension by dropping its own weight through the
The belt 6 moves at twice the speed of the reciprocating motion of
This is a technique disclosed in U.S. Pat. No. 54-753, filed earlier by the present applicant.

Since the present invention is a contact printing device as described above, even if the squeegee roller starts returning at the same time as the closing operation of the shutter starts, the printing process time can be shortened because the document will not be exposed to the removed plate-making material. The above-mentioned patent application was made for the purpose of efficiently printing multiple plate-making materials from the same manuscript.
The technology of the prior application such as No. 53-49460 can be applied more effectively.

[Brief explanation of the drawing]

FIGS. 1 and 2 are side views respectively showing aspects of essential parts of an embodiment of a contact printing apparatus according to the present invention. 1... Original, 2... Flexible transparent sheet, 3...
Fixing means, 4... Baking stand, 5... Hook, 6...
Belt, 10... Weight, 13... Plate making material, 15...
...Squeegee roller, 16...Light source device, 17...
...Lamp, 18...Reflector, 19...Rotating shutter.

Claims (1)

[Scope of utility model registration request] The original is aligned on the plate-making material arranged on the printing table, a flexible transparent sheet is covered and stacked on top of this, the inside of the flexible transparent sheet is sealed by an exhaust means, and the upper part is squeegeeed. In a contact printing device in which the original document is brought into close contact with the plate-making material by squeezing with a roller, one end of the flexible transparent sheet with the original fixed at a position aligned with the plate-making material is attached to the printing table. a mounting means for holding the other end under tension through a tensioning means; and a mounting means for holding the other end under tension through a tensioning means; It consists of a squeegee roller that releases the close contact, and an exposure means with a shutter that prints the original onto the plate-making material when the document is brought into close contact, and the shutter of the exposure means sequentially exposes and sequentially blocks light from the side opposite to the one end. A contact printing device characterized by the following features: