JPS6261938B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for adhering sheets in a vacuum contact printing machine.

In vacuum contact printing machines used for printing photographic originals, the so-called bottom light source type, in which the light source is located below the original and the photosensitive plate, positions the original and the photosensitive plate on a transparent plate located above the light source. After placing a sheet thereon and then covering it with a sheet, they are vacuum-adhered to each other.

That is, the sheet is usually wound around a sheet roll, and as the sheet roll rotates and moves on a transparent plate, the sheet is sequentially rolled out and spread out on the transparent plate. Note that the sheet roll is normally kept on standby on the rear side above the transparent plate, and moves toward the front side on the transparent plate when the sheet is unfolded. This is to make it easier to attach and remove the original plate and photosensitive plate on the transparent plate.If the standby position of the sheet roll is set to the front side of the transparent plate, the sheet roll This is because it causes inconvenience such as having to attach and detach the original plate and photosensitive plate through the plate.

Further, after the sheet is developed, in order to increase the degree of vacuum adhesion, the sheet is pressed against the transparent plate side by a push roller to make it adhere closely. In addition, it is preferable that this pushing roller rolls on the transparent plate from the front side toward the rear side so that the sheet is brought into close contact with the transparent plate side, and this method is currently used. There is. This is because the original plate and photosensitive plate are positioned on the front side of the transparent plate by pins, etc., and pressing against them from the positioning side, that is, from the front side, prevents misalignment between them. This is because it is extremely effective in preventing such problems and positioning them with high precision. The reason why the original plate and the photosensitive plate are positioned on the front side of the transparent plate is to make the positioning work easier. This is because, if this is done, the workability is poor, especially in a relatively narrow darkroom, and problems arise, such as difficulty in attaching and detaching a large original.

In such a vacuum contact printing machine, the movements of the sheet roll and the push roller are automatically controlled in relation to each other.

Conventionally, after the sheet roll has completely moved to the front side of the transparent plate and finished rolling out the sheet, the push roller, which was waiting behind the transparent plate, rises above the transparent plate. The push roller moves to the front side of the transparent plate while staying in that position, then this push roller descends and presses the sheet downward, and then this push roller rolls to the rear side of the transparent plate while staying in the lowered position, making the sheet transparent. It is attached to the board side. In this manner, the sheet roll moves from the rear side on the transparent plate to the front side, and then the push roller reciprocates from the rear side on the transparent plate to the front side thereof as a turning point, thereby bringing the sheets into close contact with each other. After that,
After the transparent plate, original plate, photosensitive plate, and sheet are vacuum-adhered, the printing process is performed.

However, according to such a sheet contact method, the push roller starts after the sheet roll has moved to the front side on the transparent plate.
The time required for the sheet adhesion work was a relatively long time, which was the sum of the reciprocating time of the sheet roll and the reciprocating time of the push roller. As a result, there was a problem in that it interfered with the plate-making work, which required even the slightest amount of time.

This invention was made in view of the above circumstances, and when the sheet roll moves to the front side on the transparent plate and unfolds the sheet, at the same time, the push roller is moved to the front side on the transparent plate. It is an object of the present invention to provide a method and apparatus for adhering sheets in a vacuum adhesion printing machine, which can shorten the adhesion work time of sheets by the forward movement time of a sheet roll.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Reference numeral 1 in the figure indicates the printing machine main body (hereinafter simply referred to as "machine main body"), and the left side of this machine main body 1 in Fig. 1 is the front side, and the right side in the figure is the rear side. ing. A glass transparent plate 2 is horizontally attached to the upper part of the machine body 1, and a light source (not shown) is located inside the machine body 1 below the transparent plate 2.
is provided. An original plate 3 and a photosensitive plate (raw film) 4 are placed on the transparent plate 2, and these are positioned on the front side of the transparent plate 2 by a pin method or the like. This pin method is, for example, a rectangular metal plate (not shown) having one to several pins.
are fixed to the front side of the transparent plate 2 with tape or the like, and by fitting the pins of this metal plate into the holes prepared in advance in the original plate 3 and photosensitive plate 4, their positions can be adjusted to the machine body 1. This is a method to do it accurately from the front.

Inside the machine body 1, there is also a vacuumulator (not shown) that removes the air between a transparent plate 2, an original plate 3, a photosensitive plate 4, and a sheet 5 (described later) that covers the photosensitive plate 4, and vacuum-adheres them to each other. )
is provided.

The sheet 5 is made of, for example, a thick rubber sheet with a thickness of about 3 mm, and is wound around a sheet roll 6, and the end of the winding is attached to the rear side of the transparent plate 2. Both ends of the sheet roll 6 are rotatably supported between the upper ends of the first rods 7, respectively. A pair of left and right first rods 7 are guided on both left and right sides of the machine body 1 so as to be movable up and down and to be movable in the left and right directions in FIG.

That is, each rod 7 is supported by a bearing 8 so as to be able to move up and down, and
is movably guided via rollers 10, 10 between guide rails 9 provided on both sides of the machine body 1 along the front-rear direction. Further, a guide roller 11 is provided at each lower end of each rod 7.
are installed, and these guide rollers 11
are rotatably supported on elevation guide plates 12 provided on both sides of the machine body 1 along the front-rear direction. Each elevation guide plate 12 is inclined as a whole so that its front portion faces downward, its front end is bent downward, and its rear end is bent upward, As the sheet roll 6 moves back and forth, it is raised and lowered.

The sheet roll 6 is moved back and forth by a first drive mechanism 13. That is, a connecting block 15 is fitted into each of the pair of left and right rods 7 via a slide bearing 14 so as to be vertically movable. Each connecting block 15 is connected to a predetermined location of an individual ring-shaped first chain 16, and each of these first chains 16 is symmetrical with respect to the left and right sides of the machine body 1. Attach the three left and right sprockets 17, 18,
It spans between 19 rooms. Of the three sprockets 17, 18, 19 on each side, two sprockets 17, 18 are arranged vertically on the rear side of the machine body 1, and the upper sprocket 17
Another sprocket 19 is provided on the front side of the machine body 1 so as to be located at the same height as the sprocket 19. Therefore, the portion of the chain 16 between the sprockets 17 and 19 is horizontal. The sprockets 18 on both sides of the machine body 1 are
They are connected by a horizontal first drive shaft 20, and the drive shaft 20 is driven in forward or reverse rotation by a reversible geared motor (not shown).

Further, inside the sheet roll 6, a spring (not shown) is provided that biases itself in the winding direction of the sheet 5, that is, in the direction of arrow A.

Reference numeral 21 in the figure indicates a push roller. The push roller 21 has an iron core covered with soft rubber or the like, and both ends thereof are rotatably supported between the upper ends of the second rods 22 at the rear of the sheet roll 6. There is. Similar to the sheet roll 6 described above, the pair of left and right second rods 7 are held between the corresponding guide rails 9 via bearings 23 and rollers 24, 24 so as to be vertically movable and movable in the front and rear directions. The lower end of the guide roller 25
It is movably supported on the corresponding elevation guide plate 12 via.

The movement of the push roller 21 is controlled by a second drive mechanism 26.
It is now being carried out by That is, a connecting block 28 is fitted into each of the pair of left and right rods 22 via a slide bearing 27 so as to be vertically movable. Each connection block 28 is connected to a predetermined location of an individual ring-shaped second chain 29, and each of these second chains 29 is symmetrical with respect to the left and right sides of the machine body 1. So that
It spans between a pair of left and right sprockets 30 and 31. 2 sprockets on each side 3
0 and 31 are arranged at the same height on the front side and rear side of the machine body 1. Therefore, the portion of the chain 29 between the sprockets 30 and 31 is horizontal. The sprockets 18 on both sides of the machine body 1 are horizontal
The drive shaft 32 is connected to a motor (not shown) with an induction clutch. and,
This drive shaft 32 is driven by the first drive shaft 32 by the motor.
It is driven to rotate clockwise in the figure, and is free to rotate counterclockwise in Figure 1.

A connecting mechanism 33 is provided between the first and second rods 7 and 22. That is,
First and second connecting arms 34 and 35 extending in opposite directions are fixed to each of the first and second rods 7 and 22, and at the tip of the first connecting arm 34, A recess 36 that opens upward is provided, while the tip of the second connecting arm 35 has a recess 36 that opens upward.
A connecting pin 37 that fits into the recess 36 from above
is provided. In addition, the second connecting arm 35
A compression spring 3 is provided between the connecting block 28 and the connecting block 28.
8 is interposed. This spring 38, together with the second connecting arm 35, always urges the second rod 22 downward.

The apparatus configured as described above automatically performs the work of adhering sheets. Therefore, next, the work of adhering the sheet will be explained in accordance with the work order.

First, the original plate 3 and the photosensitive plate 4 are placed on the transparent plate 2 and positioned on the front side of the transparent plate 2. At this time, the sheet roll 6 and the push roller 21 are moved as shown in FIG. Wait at the rear as shown in the figure. At this time, the guide roller 25 of the second rod 22 rides on the rear part of the elevating guide plate 12, and the recess 36 in the coupling mechanism 33
and the connecting pin 37 are in agreement with each other. The push roller 21 is held at an upper limit position spaced apart above the sheet 5. Then, when the positioning of the original plate 3 and the photosensitive plate 4 with respect to the transparent plate 2 is completed, the first drive mechanism 13 sends the first chain 16 in the counterclockwise direction in FIG. As a result, the first rod 7 moves toward the front, and following this, the second rod 17 moves toward the front while remaining at the upper limit position supported by the first rod 7 via the coupling mechanism 33. Move to the side. At this time, the second chain 29
is fed in a counterclockwise direction in FIG.

Therefore, the push roller 21 reliably moves to the front side following the sheet roll 6, and at the same time, the sheet roll 6 sequentially unfolds the sheets 5. At this time, the sheet roll 6 gradually descends according to the degree of inclination of the elevation guide plate 12. The extent of this decline is
It is made to correspond to the outer diameter dimension of the sheet roll 6 itself, which changes depending on the amount of the sheet 5 discharged from the sheet roll 6. This allows the sheet roll 6 to roll out the sheet 5 from a certain height position with respect to the transparent plate 2 side, and to prevent a large gap from occurring between the rolled out sheet 5 and the transparent plate 2 side. Avoiding. Also, this sheet roll 6
As the sheet 5 is slightly lowered, the push roller 21 also lowers together with the push roller 21, but the push roller 21 still moves while being spaced above the sheet 5.

When the sheet roll 6 reaches the forward movement limit position together with the push roller 21, the guide roller 1 of the first rod 7 moves as shown in FIG.
1 is located on the front side portion of the lifting guide plate 12, and the sheet roll 6 is lowered greatly. Therefore, the recess 36 in the connecting mechanism 33 and the connecting pin 3
7 is disconnected, and the push roller 21 descends until it comes into contact with the sheet 5. The push roller 21 at this lower limit position is pressed against the upper surface of the sheet 5 by its own weight and the force of the spring 38.

After that, the second drive mechanism 26 in turn drives the second
The chain 29 is fed clockwise in FIG. Therefore, only the push roller 21 presses against the upper surface of the sheet 5 and moves back toward the rear side while rolling. Therefore, the sheets 5 are brought into close contact by pressure.

Then, when the push roller 21 returns to its original standby position on the rear side, the transparent plate 2, original plate 3, photosensitive plate 4, and sheet 5 are vacuum-adhered to each other, and then the actual printing operation is performed.

When this baking operation is completed, the first drive mechanism 13 sends the first chain 16 clockwise in FIG. 3, contrary to the case described above. As a result, the sheet roll 6 moves back toward the rear side while rising according to the degree of inclination of the elevation guide plate 12.
At this time, the sheet roll 6 moves back while rewinding the sheet 5 by the force of the built-in spring.

Then, when the sheet roll 6 returns to its original standby position on the rear side, the connecting pin 37 of the connecting mechanism 33 fits into the recess 36 while being guided by the inclined surface at the tip of the first connecting arm 34.

Therefore, the sheet roll 6 and the push roller 21 return to their original standby positions again.

After that, the original plate 3 and the photosensitive plate 4 are replaced and the same operation is repeated.

By the way, the working time required from unfolding the sheet 5 to pressing it against the transparent plate 2 side and making it adhere tightly is the time required for the sheet roll 6 and the push roller 21 to move toward the front side at the same time, and the time for the push roller 21 to move toward the rear side. This is the time plus the time for return movement. This is an extremely short time that corresponds to the reciprocating time of the push roller 21.

In addition, there is a configuration for setting the push roller 21 at the upper limit position when it moves forward, and
The configuration for setting the lower limit position when the robot 1 moves backward is not limited to the above-mentioned embodiment at all, and can be appropriately modified as a so-called guide mechanism.

As explained above, according to the method and apparatus for adhering sheets in a vacuum contact printing machine according to the present invention, the sheet roll and the push roller are moved forward at the same time, so compared to the conventional method, the sheet roll is moved forward. It is possible to shorten the working time for sheet contact by the moving time, and is therefore extremely suitable for plate-making work where even the slightest amount of time is at a premium. Further, since the sheet roll and the push roller are connected to each other by a connecting mechanism and are moved forward at once, it is possible to certainly move them forward at the same time.

[Brief explanation of the drawing]

The drawings show an embodiment of the sheet adhering device according to the present invention, in which FIG. 1 is a schematic side view in a standby state, FIG. 2 is a schematic front view of the main part, and FIG. 3 is a schematic side view at the time when the sheet has finished being unfolded. It is a diagram. 1...Machine body, 2...Transparent plate, 3...Original plate, 4
... Photosensitive plate, 5 ... Sheet, 6 ... Sheet roll, 13 ... First drive mechanism, 21 ... Push roller, 26 ... Second drive mechanism, 33 ... Connection mechanism.

Claims (1)

[Scope of Claims] 1. A sheet roll around which the sheet is wound, one end of which is attached to the rear side of the machine body, and an upper limit when the original plate and the photosensitive plate are spread and brought into close contact with each other on a transparent plate. The sheet was spread out on the transparent plate by simultaneously moving the push rollers located on the transparent plate from the rear side of the machine body to the front side of the machine body, and then the push rollers were lowered and pressed against the sheet. A method of adhering a sheet in a vacuum contact printing machine, characterized in that the sheet is brought into close contact with the transparent plate by moving the sheet from the front side of the rear machine body to the rear side while rolling it. 2. A vacuum contact printing machine comprising a sheet roll around which a sheet is wound, one end of which is attached to the rear side of the machine body, and a push roller above a transparent plate to which an original plate and a photosensitive plate are vacuum-adhered. In the close contact device, a first drive mechanism that reciprocates the sheet roll between the front side and the rear side of the machine body on the transparent plate, and the push roller reciprocates from the rear side of the machine body to the front side. a guide mechanism that guides the push roller at an upper limit position and guides the push roller at a lower limit position to bring the push roller into pressure contact with the sheet when the push roller moves back from the front side of the machine body to the rear side; and the sheet roll. a coupling mechanism that connects the sheet roll and the push roller to move the push roller forward following the sheet roll when the sheet roll moves forward from the rear side of the machine body to the front side; 1. A sheet adhesion device in a vacuum adhesion printing machine, comprising a second drive mechanism that moves back from the side to the rear side.