JPH0322752Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a printing press as a multi-sided printing device, and more specifically, to improving the means for holding and moving the photographic original in the printing plate, and simplifying the structure of these means. We also aim to reduce weight, thereby increasing machine precision and improving product quality.
The present invention also relates to a device that has features such as improving the workability of the plate printing machine, facilitating manufacturing, and reducing manufacturing costs.

The printing press places the photographic original plate attached to the original plate holder facing the printing plate attached to the plate material holder,
Once the photographic master is positioned at a predetermined position on the plate surface, the required number of photographic master images are printed on the plate surface by repeating the operation of bringing the photographic master into close contact with the plate and exposing it to light (so-called multi-sided printing). It is a device for attaching

As described above, when multiple images of a certain photographic original plate have been attached to one plate surface, the plate material holder and the original plate holder are tilted in opposite directions to horizontal positions, and the next step is performed for each plate material and photographic original plate. We will replace it with the one.

By the way, the plate material and the photographic master must be attached to the mounting members, that is, the plate material holder and the original plate holder, at the reference positions on the holders at all times before performing the above-mentioned plate printing machine operations. Needless to say, this is true.

It goes without saying that the reference positions of the plate material holder and original plate holder themselves are always kept constant.

In other words, the strictness of the printing position of the photographic original image on the plate surface and the continuity of maintaining this position are based on the premise that the positions of the plate material holder and original plate holder themselves are constant, and that the mounting positions of these printing materials and the photographic original plate are accurate. It can only be achieved if

However, the original holder is attached to a moving frame that is movable in the Y direction between a pair of support columns that are movable in the X direction, and is driven by the moving frame to move in the X, It is designed to move in the Y direction, but in conventional machines, first, a developing frame is attached to the moving frame to enable expansion to a horizontal position, and an original holder is attached to the developing frame. .

The inventor of this invention, based on the above-mentioned viewpoint regarding the strictness of the printing position of the photographic original image on the plate material surface and the mechanical precision which is a prerequisite for ensuring maintenance continuity,
In addition, we will add the viewpoints from the standpoint of operating a plate printing machine and the standpoint of manufacturing a plate printing machine. After conducting a detailed study on the original plate holder, we discovered that there is a fundamental irrationality in it.

Therefore, this will be explained separately below.

(1) Consideration from the standpoint of machine accuracy.

(b) The original plate holding and position moving means in the conventional machine are as shown in Figure 1. That is, between a pair of support columns (not shown) that are movable in the X direction,
A movable frame 1 is attached so as to be movable in the Y direction, a deployable frame 2 is attached to the movable frame 1 so as to be deployable to a horizontal position as shown in the figure, and further,
An original plate holder 3 equipped with a transparent plate 30 is removably screwed onto the development frame 2.
To attach the photographic original to the original holder 3, as shown in the figure, unfold the developing frame 2 to a horizontal position.
The photographic original plate 4 is placed on the transparent plate 30 of the original plate holder 3, and the centering gauge 5 is lowered thereto, and the centering gauge 5 is lowered to fit into the locking pin hole 31 of the original plate holder 3.
, the locking pin 5 of the centering gauge 5
0 and fixes the centering gauge 5 on the original plate holder 3, the registration line of the centering gauge 5 aligns with the transparent plate 30.
The register mark 40 of the photographic original plate 4 is placed on the registration line.
Accurately superimpose the photographic original plate 4 on the translucent plate 3.
Fixed above 0.

Through the above operations, the photographic original plate is positioned and fixed on the original plate holder, but in order to achieve the strictness of the printing position of the photographic original image on the plate surface and the continuity of this, it is necessary to As mentioned above, first of all, it is assumed that the attachment position of the original holder to the development frame is maintained strictly constant (consistency of the position of the development frame is also necessary), but such a configuration In conventional machines, problems first appear in the following cases.

In other words, in actual work, in addition to the original plate holder in use, a spare original plate holder is prepared, and if the transparent plate of the original plate holder is damaged during operation of the printing press (plate material Due to the high pressure and thin light-transmitting plate used when the photo original is in vacuum contact with the photo original, this accident is not always likely to occur.) Remove the original holder from the development frame (it is secured with screws), By installing a spare original plate holder, work interruptions and stagnation are avoided.

By the way, the dimensional accuracy of the original plate holder, especially,
Regarding the positional accuracy of the locking pin hole as a reference position configuration means, it goes without saying that even if care is taken during manufacturing to ensure that all original holders are in exactly the same position, the original holder alone However, even with such careful manufacturing, the position of the locking pin hole when it is attached to the development frame cannot be completely maintained, regardless of the type of original holder. Even if it is possible in theory, it is a very difficult subject in practice, and as a result, it may lead to a situation where the prerequisites for ensuring the strictness of the printing position of the original photographic image are not met. It is. ...Compatibility issue with the original holder.

(b) Furthermore, removably fixing the original plate holder to the development frame with screws is a big concern as it may lead to poor accuracy due to loosening of the screws due to repeated use.

(2) Consideration from the standpoint of printing press operation.

Each time a photographic original is replaced, the orientation of the development frame and original holder must be changed from vertical to horizontal to vertical.As these components have considerable weight, this imposes a heavy workload. If the weight of the means for holding and moving the photographic original could be made lighter, it would greatly improve work efficiency.

(3) Consideration from the perspective of printing press manufacturing.

The fact that the means for holding and moving the photographic original consists of two members, the development frame and the original holder, results in the expenditure of much energy in order to perfect the mechanical precision.

In other words, first of all, it is necessary to perfect the accuracy of the mounting position of the developing frame to the moving frame, and then to perfect the dimensional accuracy of the original holder itself and the accuracy of the mounting position of the original holder to the developing frame.
Manufacturing this requires meticulous and careful work by high-precision processing machines and skilled workers.
At the same time, many materials and parts are required, and these
This inevitably results in increased manufacturing costs and a repercussion in product prices.

As is clear from the above multifaceted and detailed examination, the means of holding and moving the original photographic plate, which has been put into practical use without raising any questions, has obvious irrationality and disadvantages. I understand that it is included.

In other words, the elucidation of these irrationalities and disadvantages has been completely careless and followed the conventional structure as it is, and unless it is reexamined from a strict perspective, it will be overlooked without feeling any inconvenience. This was achieved by focusing on this part for the first time, and the part that has been completely overlooked until now is the following.

Conventionally, to replace a photographic original plate, the original plate holder was removed from the printing press, transferred to a separately prepared centering table, the photographic original was replaced there, and the original plate holder was reattached to the printing press.

That is, conventionally, in order to replace a photographic original plate, it was necessary to remove the original plate holder from the plate printing machine, and to
It was customary to do this outside the printer.

Later, improvements to printing presses made it possible to do this by tilting the original holder forward to a horizontal position without removing the original holder (see Figure 1).

However, at this time, the conventional original plate holder was adopted as is, and the positional movement of the photographic original plate (i.e., change in the posture of the original plate holder) was still configured to be accomplished by a development frame as shown in the first diagram. There is.

It should be easy to understand from the above description that this is the cause of the irrationality and disadvantages revealed by the above discussion.

The present invention was proposed in light of the clarified facts obtained through the above study.The present invention takes a completely new perspective that is not bound by conventional ideas, and proposes a method for holding and moving the original photographic plate. As a result of careful consideration, we have found that a single component satisfies the functions required by the method and, as a matter of course, has the effect of completely eradicating the above-mentioned irrationality and disadvantages. This is a concrete measure that has been found.

Therefore, the present invention is such that a flat frame surrounding and holding a transparent plate for mounting a photographic master is provided with a position setting means for mounting the photographic master at a reference position and a packing for forming a vacuum chamber. An original plate holder for a plate printing machine, characterized in that the original plate holder is detachably attached to the upper surface of a frame-shaped base frame while maintaining airtightness, and the base frame is further attached to the main body of the plate plate in a deployable manner. This is related to a proposal.

Hereinafter, one embodiment will be described in detail with reference to the accompanying drawings showing one embodiment.

6 is a base frame; 7 is a flat frame holding a transparent plate 70 fixed to the upper surface of the base frame 6 with a stopper 8; the flat frame 7 can be opened by loosening the stopper 8; It is removable.

Therefore, if the transparent plate 70 is damaged and needs to be replaced, the flat frame 7 can be removed and another flat frame fixed as shown.

Further, on the upper surface of the base frame 6, the center of the locking pin hole 9 of the locking pin of the centering gauge as shown in FIG. Pin hole forming block 9
0 are fixed by respective fasteners 8 (therefore, the pin hole forming blocks 90 of the flat frame 7 are placed at corresponding positions so that the same blocks 90 do not become an obstacle to the installation of the flat frame 7 to the base frame 6). The centering gauge is fixed on the transparent plate 70 by inserting the locking pins of the centering gauge into the pin holes 9, respectively. When, the center line of the base frame 6 (X, Y)
The registration line for the centering gauge is placed on the top, so when installing the photographic original,
First, the photographic original is placed on the transparent plate 70, and the centering gauge is fixed there as described above, and the register mark on the photographic original is precisely aligned with the registration line of the centering gauge. Once pasted, the photographic original plate is accurately placed and fixed at the center of the base frame 6, that is, at the reference position.

10 is a packing fixed to the upper surface of the base frame 6, and the base frame 6, which is hinged 60 on the movable frame 1, is raised to face the photographic original plate to the plate material, and the photographic original plate is vacuum-adhered to the plate material. It functions to form a vacuum chamber.

The base frame 6 is provided with a required height h, so that when the base frame 6 is raised, the original plate holder protrudes the required width from other members toward the plate material holder, and the plate material is Other members are prevented from becoming an obstacle during the printing operation of the photographic original image.

Furthermore, a groove 72 is recessed around the entire circumference of the lower surface of the flat frame 7, and the packing 11 is embedded in the groove 72. Therefore, when attaching the flat frame 7 to the base frame 6, As each stopper 8 is tightened, the packing 11 is crushed by the flat frame 7 and the base frame 6, completely ensuring airtightness between the base frame 6 and the flat frame 7, that is,
During the vacuum operation, air is completely prevented from entering the vacuum chamber formed by the packing 10 and the plate material side.

Since the present invention is constructed as described above, even if the transparent plate 70 is damaged and the flat frame 7 is replaced,
This does not affect the reference positional accuracy for attaching the photographic original in any way. In other words, if the pin hole forming block 90 is accurately attached to the base frame 6, the position of the locking pin hole 9 will be completely constant. Therefore, the flat frame 7, that is, the transparent plate 70, can be easily replaced regardless of the accuracy of the mounting position, completely solving the problem of compatibility of original plate holders, which was the most difficult problem in conventional machines. It is something to be solved.

In addition, by making it possible to hold and move the photographic original using a single frame, the structure is simplified and the weight is reduced, resulting in higher machine precision, workability, and manufacturing efficiency. Needless to say, the effect on simplification and cost reduction is tremendous.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional device for holding and moving a photographic original, Fig. 2 is a top view of the same device according to the present invention, and Fig. 3 is a longitudinal section taken along the line A-A' in Fig. 2. The top view and FIG. 4 are also exploded perspective views. 1...Moving frame, 6...Base frame, 7...Flat frame, 9...
... Locking pin hole, 90 ... Pin hole forming block,
10,11...Packing, 70...Transparent plate, 7
1...It is a perforated window.

Claims (1)

[Scope of utility model registration request] A flat frame surrounding and holding a light plate for attaching a photographic original plate is attached to the top surface of a frame-shaped base frame comprising a position setting means for attaching the photographic original plate to a reference position and a packing for forming a vacuum chamber. An original plate holder for a printing press, characterized in that the original plate holder is detachably attached while maintaining airtightness, and the base frame is attached to the main body of the printing press so that it can be expanded.