JPH0594847U - Original drawing holder - Google Patents

Abstract

(57) [Abstract] [Purpose] When the original image holder of the plate making machine is shielded from light, the light source light is completely blocked from entering the shielded area, and the distance between the original images is greatly reduced, allowing a large number of images to be printed by a single plate material. The original image can be printed to contribute to material savings, machine operation efficiency, and work efficiency. An automatic masking device 6 that contacts the glass plate 4a with the light source 8 as a reference and automatically drives each light-shielding curtain 6a from the front, rear, left and right of the glass plate 4a to an arbitrary position on the surface of the glass plate 4a on the front side of the glass plate 4a. Along with placing
The glass plate 4a on the front side of the automatic mask device 6
The original image holder of the engraving machine is provided with a light source light collimating material 7 for equalizing the directionality of the light source light at a right angle to the glass plate 4a in a plane parallel with. [Effect] The light source light is collimated by the light source light collimating member 8
Since the light travels in the direction of a at a right angle and enters the material to be exposed (the original film and the plate material) at a right angle, the light source light is completely prevented from entering the light-shielded region.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a new proposal of an original image holder for a platemaking machine.

[0002]

[Prior Art]

 The stencil machine is a mechanical device for allocating and arranging the original film on the plate material (PS plate) surface in advance, and sequentially printing the images on the original film on the plate material surface according to the arrangement.

The layout mode is, for example, as shown in FIG. That is, the figure shows one typical example of the layout. The image (2) of the original film is allocated to the plate material (1) surface, 6 frames each in the upper and lower rows, and the original image (2) is displayed. The case where the image is printed on the surface of the 12-frame plate material (1) in total is shown.

As described above, the original image (2) is attached to the plate material (1) in multiple planes by using the plate making machine, which saves the material (plate material and printing paper), This is the ultimate conclusion obtained by pursuing the improvement of the operation efficiency of the stencil printing machine and the printing machine, and the work efficiency of the bookbinding process after the printing process. There is always a strong demand for efficiently allocating a large number of images (2) on the plate (1) surface.

In order to meet this demand, it goes without saying that the original image (2) is packed into the plate material (1) as much as possible, and for that purpose, the original image (2) and the original image are It is required that (2) and (2) are arranged as close to each other as possible.

However, in the multi-sided printing plate as shown in FIG. 1, the original image film is positioned and attached to the center of the glass plate (that is, the translucent plate) of the original image holder and the plate is attached to the plate material holder. Position and attach the material, and place the original image holder (original film) in sequence on the plate material holder (plate material) surface according to the layout of the original image that was pre-assigned and calculated, and perform exposure at each position. It is what is done.

[0007] The printing mode of the plate making machine is such that the plate material attached to the plate material holder and the original image film attached to the original image holder are faced to each other, and air is forcibly drawn out from between them to achieve a complete contact. In this state, exposure is given. At this time, the positional relationship of each member viewed from the side is “light source” → “original image holder (glass plate)” → “original image film” → “plate material” → “plate material holder”.

By the way, since the area relationship between the glass plate of the original image holder and the original image film is, of course, glass plate> original film, the exposure light does not pass around the original image film attached to the glass plate. Therefore, it becomes necessary to always shield the light. There have been various studies on how to block this light, but no effective solution has been found until now. In other words, with respect to the shading of the original picture holder, the reality is that it has come to the present with various problems.

The problem is that when the light is shielded from the other side of the glass plate as viewed from the light source, the arrangement relationship of the respective members at this time is as follows: “glass plate” → “original film” →→ “light shielding” Since the relationship of "material" → "plate material", that is, "light-shielding material" is interposed between "original film" and "plate material", the thickness of the light-shielding material is the edge of the original image. This creates a shadow on the area, which inevitably causes the problem that the periphery of the original image printed on the plate material becomes a blurred image.

On the other hand, in the case where light is shielded on the front side of the glass plate, the arrangement relationship of each member at this time is as follows: “light shielding material” → “glass plate” → “original film” → “plate material” Therefore, there is no problem when light is shielded on the other side of the glass plate, but in this case, the “glass plate” is interposed between the “light-shielding material” and the “original film”. Become. The interposition of this glass plate causes the light source light emitted from the light source (point light source) to travel radially (the more it deviates from the position directly below the light source to the front, rear, left, and right, the larger the angle of advancing diagonally). This causes a problem that the light source light that obliquely travels into the light-blocking region while passing through the plate.

Therefore, in this case, in the end, the interval between the original images in the case of multi-sided printing is largely taken up by that amount (the amount of light from the light source that penetrates the glass plate to enter the light-shielding area), and the adjacent original images are taken. The image has to be doubled so that it is not exposed.

That is, this violates the purpose of packing and arranging as many original images as possible on the plate material surface, and there is a problem that the above proposition is not satisfied.

[0013]

[Problems to be solved by the device]

 The present invention is intended to satisfy the above-mentioned proposition by devising a drastic improvement measure of the light-shielding technology related to the above-mentioned original image holder, and at the same time, speed of operation of the breeding machine. The purpose is to achieve higher speed (speeding up of baking work).

[0014]

[Means for Solving the Problems]

 As described above, when light is shielded from the side of the glass plate as seen from the light source, the thickness of the light shielding material creates a shadow on the edge of the original image, which is the edge of the original image printed on the plate material. Since the defect of becoming a blurred image inevitably is unavoidable in this case, avoid this method, start by placing an automatic mask device as a light shielding means on the front side of the glass plate, and the problems that arise with this method, That is, the defect that the light source light obliquely passes through the glass plate and enters the light-shielding area, the direction of the light source light on the parallel surface with the glass plate on the front side of the automatic mask device By arranging a light source collimating material that makes the light source uniform at a right angle to the plate, we will discuss the shading method for the original image holder of the plate-making machine, which has been difficult to find an effective solution until now. , It is obtained by realizing the drastic improvement.

[0015]

[Action]

 The light source light emitted from the exposure lamp (point light source) and traveling radially is corrected at a right angle to the glass plate by the light source light collimating material arranged on the front side of the automatic mask device. It is incident at a right angle to the material to be exposed (original film and plate material). That is, the light source light collimating material prevents the light source light from entering the light shielding region.

[0016]

[For implementation]

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings showing an embodiment. (3) is a plate material holder, and (1) is a plate material attached to the plate material holder (3).

(4) is an original image holder, and (5) is an original image film attached to the original image holder (4).

The original image holder (4) is provided with a glass plate (4a), and an automatic mask device (6) is provided on the front side of the glass plate (4a).

Although the details of the automatic mask device (6) are omitted, the light-shielding curtains (6a) arranged one each on the front, rear, left and right sides of the glass plate (4a) are independent of each other. 4a) is automatically driven to any position on the surface.

(7) is a light source light collimating member, such as a Fresnel lens, disposed on the front side of the glass plate (4a) on a plane parallel to the glass plate (4a), and (8) Is an exposure lamp (light source).

According to the original image holder of the present invention having the above-mentioned configuration, the light source light emitted from the exposure lamp (8) travels radially like the first (L ₁ ), but by the light source light collimating material (7) , (L ₂ ) at a right angle to the glass plate (4a), and the glass plate (4a) is pierced at a right angle to reach the original film (5) and the plate material (1) which are the exposure target materials.

Therefore, according to the original image holder of the present invention, there is an unsolved problem in the case of adopting the method of arranging the light shielding means on the front side of the glass plate, that is, the light source light may enter the light shielding area. Disappear.

[0023]

EFFECTS OF THE INVENTION In the present invention, the automatic mask device as the light shielding means is arranged on the front side of the glass plate, so that the baking caused by the thickness of the light shielding material by disposing the light shielding means on the other side of the glass plate In addition to eliminating the problem of blurred images in the peripheral area of the image, the problem that the light from the light source enters the light-shielding area when the light-shielding means is arranged on the front side of the glass plate is also on the front side of the automatic mask device. The light source light collimating material placed on the plane parallel to the glass plate solved the problem.

That is, in the conventional method, it is necessary to calculate in advance that the light source light travels obliquely through the glass plate and enters the light-shielding region, and the original image must be allocated accordingly. The distance between the original image and the original image can be kept constant because the original image holder of the present invention allows the light from the light source to be always applied at right angles to the exposure material, although the distance between them must be large. It is possible to make the size of the original image much smaller than that of the conventional method. This is a great idea that contributes to material saving, efficient operation of the machine, and efficiency of the baking work because it can be allocated and arranged and baked.

In addition, in the conventional method, the exposure lamp is not brought too close in order to avoid the light source light obliquely traveling through the glass plate as much as possible, which shortens the exposure lamp lighting time ( However, the original image holder of the present invention can bring the exposure lamp close enough to the original image holder, thus shortening the exposure lamp lighting time (speeding up the baking operation). At the same time.

[Brief description of drawings]

FIG. 1 is a front view showing an aspect of a multi-sided printing plate.

FIG. 2 is a structural explanatory view of the original image holder of the present invention seen from the side.

[Explanation of symbols]

 1 ... Plate material 2 ... Original image 3 ... Plate material holder 4 ... Original image holder 4a ... Glass plate 5 ... Original image film 6 ... Automatic mask device 7 ... Light source Light collimating material 8 ... Exposure lamp

Claims (1)

[Scope of utility model registration request] 1. An automatic masking device, which is in contact with a light-transmitting plate with respect to a light source, and which automatically drives respective light-shielding curtains from the front, rear, left and right of the light-transmitting plate to arbitrary positions on the light-transmitting plate surface. And a light source light collimating member for equalizing the directionality of the light source light at right angles to the light transmitting plate on the front side of the automatic mask device and parallel to the light transmitting plate. The original picture holder of the breeding machine, which is characterized by the fact that it has been done.