JPH0548196Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a technical configuration suitable as an original plate holder for a printing machine, particularly for a plate printing machine.

More specifically, it has the feature of a technical configuration in which a film fixing material made of a soft material such as rubber containing a plasticizer and processed to have a smooth surface is embedded in the support frame of the glass plate in the original plate holder. As a result, the use of adhesive tape for attaching and detaching the base film to and from the original plate holder is completely unnecessary, making it possible to perform this work (attachment and detachment of the base film) easily, quickly, and reliably. However, at the same time, the present invention relates to a proposal for an original plate holder that completely eliminates the generation of adhesive waste on the original plate holder, and that drastically improves the accuracy of fixing the position of the base film.

Now, a printer (we will explain below using a printer as an example) positions the film master in the center of the master holder and attaches it.
Position the PS plate on the plate holder and attach it.
The two are placed face to face, and then the film master is placed in a predetermined position on the PS plate surface. At each position, the two (film master and PS plate) are vacuum-contacted and exposed to light, forming a unit image (an image on the film master).
This device is used to align and print the desired number of particles on the PS plate surface.

However, once a unit image has been printed at a predetermined position on one PS plate, it becomes necessary to remove the film original from the original holder and the PS plate from the plate material holder, and attach the next one.

Therefore, in this work, the method for attaching and removing the film master to the master holder is to position and attach the film master directly to the transparent plate (glass plate) surface of the master holder.

A method in which the film master is positioned and attached to the center of the base film, and then each film master is attached to the master holder.

However, for the reasons described below and in (2), the method using a base film has come to be frequently used.

Work Efficiency In the case of the method of attaching the film original to the original holder as it is, the film original must be positioned and attached on the original holder surface each time printing is completed, and it is not possible to improve work efficiency by presetting.

Furthermore, as will be described below, the task of removing adhesive waste from the glass plate surface of the original holder becomes a considerable burden.

On the other hand, when using a base film, the original film to be processed can be attached to a base film of a certain size in advance in the order of processing, making the printing machine more efficient. It is possible to satisfy the demand for operating the system.

In addition, when using a base film, attachment and detachment can be done by handling objects of a certain size, and positioning can be accomplished with simple mechanical movements since a pin register system can be used. Be efficient.

Quality Assurance When attaching the film original plate directly to the transparent plate (glass plate) surface of the original plate holder, the four corners of the film original plate are fixed to the glass plate surface with adhesive tape. It is unavoidable that adhesive debris will adhere to the glass plate surface, and if this glue debris is not completely removed, it will cause blurring, but when using a base film, such concerns can be ignored. be small enough to be acceptable.

Therefore, the conventional procedure for using a base film will be explained with reference to FIG.

First, the original film 2 is positioned and fixed at the center of the base film 1 in advance.

Then, a pin hole 100 for a register is made in the base film 1.

This base film 1 is inserted into the register pin hole 300 facing the original holder 3.
0 and place it on the original holder 3, and insert the register pin 4 there.

As a result, the base film 1 is held on the original holder 3 in a controlled position.

Therefore, the four corners of the base film 1 are fixed with adhesive tape 5.

After fixing this base film 1,
By pulling out the register pin 4, attachment of the film original 2 to the original holder 3 is completed.

However, as described above, the film original plate 2 fixedly held in the above manner is brought face to face with the PS plate, and the printing and separation due to the vacuum contact between the two are repeated. , the film original plate 2 has a very small horizontal shift,
As a result of overprinting the C, M, Y, and BL color plates, quality defects (color misregistration) may occur in color printed matter.

This proves that positional accuracy of the original film 2 cannot be ensured in a strict sense by fixing the four corners of the base film 1 to the original holder 3 with the adhesive tape 5. It is something.

Note that 5' is an adhesive tape for fixing the film original.

This invention completely eliminates the problem of the film original plate coming into close contact with the PS plate mentioned above and the lateral displacement that occurs during the printing process, and also allows the base film to be easily, quickly and reliably attached to and removed from the original plate holder. This original plate holder eliminates the need for adhesive tape to fix the film original plate, eliminating the cause of quality defects (burning blur) caused by adhesive residue remaining on the glass plate surface. The gist of this proposal is that a desired area of a support frame surrounding a glass plate is formed so as to be flush with the support frame and the surface of the glass plate, and the surface is smoothed by containing a plasticizer. A film fixing material made of a soft material such as rubber is embedded.

That is, in the present invention, the base film is fixed to glass by embedding the film fixing material, which is a soft material such as rubber containing a plasticizer and having a smooth surface, in the support frame of the original holder. If it is positioned at the center of the plate surface (the positioning means may be any pin register system such as the method described above), its peripheral edge will be placed on the support frame, so there , For the part related to the film fixing material, attach the base from above.
If you press and stroke the film lightly with your hand, the plasticizer seeping out on the surface of the film fixing material will create a fan between the base film and the film fixing material.
Due to the De Waals force, the base film is bonded and fixed to the film fixing material (ie, the support frame).

What's more, as mentioned above, the adhesive effect of this Juan der Waals force gradually spreads to the surrounding area and is strong, just by lightly pressing and stroking it with your hand. I'm going with you.

Therefore, all that is left to do is to perform the work (operating the plate printing machine) as described above, that is, to print the image of the original film onto the PS plate by vacuum-adhering the original film and the PS plate. The effect of the Van der Waals force on the base film to adhere to the film fixing material becomes even stronger as the base film is pressed against the film fixing material during this vacuum adhesion operation. Therefore, lateral displacement of the base film and eventually the original film during the printing operation is completely prevented.

Hereinafter, one embodiment of the present invention will be described based on the drawings (FIGS. 1 and 2).

In the figure, 3 is an original plate holder, and the original plate holder 3
The glass plate 30 is supported around the glass plate 30 by a support frame 32 holding a packing 31 for forming a vacuum chamber.

Although not shown in the figure as it is not directly related to the present invention, if we take a rigid plate printing machine as an example, the original plate holder 3 can be tilted down to a horizontal position (at this position, the base plate is・It is attached to the main body in such a way that the film can be replaced (when the film is replaced) and it can be raised to the upright position (at this position, the original film plate and PS plate are baked by vacuum contact). be.

Therefore, in the present invention, in an appropriate area of the support frame 32 (it is sufficient to satisfy the condition that the effect of the Van der Waals force is sufficiently obtained around the entire periphery of the base film), As shown in the figure, the film fixing material 6 shown in FIG.
It is buried so that it is flush with the glass plate surface 30a.

Therefore, the base on which the film original plate 2 is fixed is
The film 1 is positioned and placed on the glass plate 30 (the position of the base film 1 at this time may be controlled by using any pin register system, not shown), and then the base film 1 is placed on the glass plate 30. If you lightly press and stroke the area around the film fixing material 2, a Van der Waals force will act on the base film 1 and the film fixing material 6, and the base film 1 will touch the film fixing material 6. 6, and as mentioned above, its effect gradually spreads to the surrounding area and becomes stronger over a very short period of time.

After fixing the base film 1 to the original holder 3 in this way, raise the original holder 3 to an upright position (at this time, although not shown, since the original holder is also in an upright position, the film original 2 and (The PS plate is placed face-to-face), and then baking is performed by vacuum contact as described above according to the desired operation of the plate printing machine. As mentioned above, the film becomes stronger in this vacuum adhesion operation, and thus the lateral displacement of the film original during the printing operation, which has been a problem in the past, is reduced to a necessary and sufficient area at the peripheral edge of the film original. However, this can be completely prevented by being evenly and firmly fixed to the original plate holder.

Furthermore, after the above-described printing operation is completed, the base film can be easily removed by lowering the original holder 3 to a horizontal position, peeling off one end of the base film 1 from the support frame 32, and bending it back. .

In this way, the present invention completely eliminates the need to use adhesive tape to fix the base film to the original holder, and fixes the base film to the original holder by fixing the necessary part (film fixing material) around the base film placed on the original holder. The purpose can be achieved by simply pressing and stroking the part (related to the area) with the hand, making the task extremely easy.

Moreover, the fixation of the base film to the original plate holder itself is extremely strong, especially in the horizontal direction, and the base film (that is, the original film plate)
This completely prevents lateral deviation during the printing operation, and has a tremendous effect on improving product quality.

Furthermore, eliminating the need for adhesive tape as a means of fixing the base film completely eliminates the possibility of adhesive waste adhering to the glass plate surface, which greatly contributes to improving product quality.

Although it has been experimentally confirmed that the film fixing material alone can perform its function sufficiently as a fixing means for the base film, it is also possible to use this fixing means in combination with vacuum suction means. be.

Furthermore, the base material of the film fixing material is not limited to rubber.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the original plate holder according to the present invention. FIG. 2 is an explanatory cross-sectional view of the main parts of the original plate holder according to the present invention. FIG. 3 is a diagram showing a procedure for attaching a base film to an original plate holder according to a conventional example. Code, 1... Base film, 2... Original film plate, 3... Original plate holder, 4... Register pin, 5... Adhesive tape, 6... Film fixing material, 30... Glass plate, 32... support frame.

Claims (1)

[Scope of utility model registration request] A film made of a soft material such as rubber containing a plasticizer and processed to have a smooth surface is fixed to a desired area of the support frame surrounding the glass plate so as to form the same plane as the support frame and the surface of the glass plate. An original plate holder for a printing machine characterized by having a material buried therein.