JPH0720670Y2 - Silver salt plate making machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver salt type plate making machine for producing a master plate for offset printing.

[0002]

2. Description of the Related Art A conventional silver salt plate making machine is shown in FIG. The plate making machine shown in this figure is equipped with a moving document table 1. The document table 1 is provided on the upper surface of the casing 2 so as to be horizontally movable. In the plate making machine shown in the figure, the document table 1 is moved to the right end and a document is set. After setting the document at a predetermined position, the document table 1 is moved from right to left, and the lower surface of the document is scanned with light. For this reason, the casing 2 is provided with a slit-shaped light-transmitting portion in the central portion, and the light source 3 is provided below the light-transmitting portion. In order to irradiate the lower surface of the original 3 with light, the light source 3 is provided near the light transmitting portion. Light source 3
The light emitted from is reflected on the lower surface of the document, further reflected by the mirror 4, and is applied to the surface of the master paper 5. The master paper 5 is irradiated with light according to the density of the original. That is, the master paper 5 is irradiated with the light image of the document. The property of the silver salt coated on the surface of the master paper 5 changes depending on the irradiation intensity of light. The master paper in this state is subjected to development and stabilization treatment to form a master plate for plate making.

[0003]

As shown in FIG. 1, the plate making machine which moves the platen 1 has a feature that the mechanism of the optical system can be simplified. This is because it is not necessary to move the mirror 4 or the light source 3 to scan the original with light. Further, in the device that does not move the mirror 4 and the light source 3, the relative position between the master paper 5 and the original does not change, which is one of the reasons why the mechanism of the optical system can be simplified.

However, the plate-making machine having this structure has a drawback that it takes time and effort to set an original at an accurate position. This is because when the document table 1 is moved to the document setting position, the document cannot be illuminated by the light source 3 from the lower surface. In a large plate making machine that scans the optical system with the platen fixed, the platen does not move, so the platen is irradiated with light from the bottom,
The original can be set accurately at a fixed position. However, the plate making machine that moves the platen is required to be compact in size, and the master paper loading section is located below the set position of the platen. It is impossible to arrange a light source for For this reason, the plate making machine that moves the document table sets the document in a fixed position as described below.

Positioning pins (not shown) are provided on the transparent plate of the document table 1, and set paper (not shown) having guide holes formed corresponding to the positioning pins is prepared. Alignment is printed on the set paper in a grid pattern, and the center is displayed. The set paper is taken out from the document table 1, and the document is accurately fixed based on the alignment. Use manuscripts such as tapes for the originals and make them into set paper. Place the set paper on which the original is placed in the fixed position on the original table 1. At this time, the guide hole of the set paper is inserted into the positioning pin of the document table 1, and the set paper is set at a fixed position.

As described above, since the original is fixed at a fixed position through the set paper, it takes a lot of time and labor. Also,
Since set paper, which is a consumable item, is used, there is a drawback that the running cost becomes high. To make matters worse,
When making a part of a large original, it is necessary to cut the original into a size that can be fixed to the set paper. For this reason, there is a drawback in that it is not possible to set a document that is troubled when it is cut as it is.

The present invention was developed with the object of solving the drawbacks of the conventional silver salt type plate making machine, and the important purpose of the present invention is to easily and easily copy an original. It is to provide a silver salt type plate making machine that can be accurately set in a fixed position. Another important object of the present invention is to provide a silver salt type plate making machine capable of accurately setting the original on the original table without cutting the original.

[0008]

The silver salt type plate making machine of the present invention has the following constitution in order to achieve the above-mentioned object. That is, the plate making machine irradiates the casing 2 with a platen 1 which is horizontally movable on the upper surface of the casing 2 and has a transparent plate 1B, and the document placed on the transparent plate 1B from below. It is provided with a light source 3, a loading section for the master paper 5 on which the light reflected by the light source 3 is irradiated, and a developing section for the master paper 5. The silver salt plate making machine of the present invention is characterized by having the following configuration. (A) A document irradiation surface light source 8 for irradiating a document from below is provided between the transparent plate 1B of the document table 1 and the casing 2. (B) The document irradiation surface light source 8 is fixed to the upper surface of the casing 2. (C) The document table 1 is horizontally movable above the document irradiation surface light source 8. (D) The document irradiation surface light source 8 is arranged at a position where the document table 1 is set, and illuminates the document from below at the setting position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. However, the examples described below exemplify a silver salt type plate making machine for embodying the technical idea of the present invention, and the plate making machine of the present invention is composed of materials, shapes, structures of components, The arrangement is not specific to the structure below. The plate making machine of this invention can be modified in various ways within the scope of claims for utility model registration.

Further, in this specification, the numbers corresponding to the members shown in the embodiments are referred to as "utility model registration request" and "to solve the problem" so that the utility model registration request can be easily understood. It is added to the members shown in the column of "means for performing". However, the members shown in the scope of claims for utility model registration are by no means limited to the members of the embodiment.

The silver salt plate making machine shown in FIG. 2 includes a casing 2, a document table 1, a document irradiation surface light source 8, a light source 3, and a light source 3.
It is provided with a loading section for the master paper 5, a developing section 6, and a stabilizing section 7.

The casing 2 has a box shape as a whole, and almost the entire upper surface is closed by a metal plate or the like which does not transmit light, and a slit-like light transmitting portion is provided in the central portion. The translucent part is
It is closed with glass so that it can transmit light. The upper surface of the casing 2 is horizontal.

As shown in FIG. 3, the document table 1 is provided on the upper surface of a casing 2 so as to be horizontally movable. The document table 1 includes a rectangular frame member 1A, a transparent plate 1 fixed to the frame member 1A, and a lid 1C for pressing the document from above. The frame member 1A is movably connected to a rail 9 fixed in parallel to the upper surface of the casing 2. As shown in FIG. 4, the lid 1C is openably and closably connected to the frame member 1A via a hinge 10.

The document irradiation surface light source 8 is the transparent plate 1 of the document table 1.
As shown in FIG. 3B, it is disposed between the transparent plate 1B of the document table 1 and the casing 2. The document irradiation surface light source 8 is
This lights when the document is set on the document table 1 that has moved to the right end in FIG. When the document irradiation surface light source 8 is turned on, the document is irradiated from below. The light radiated from below passes through the document placed on the transparent plate 1B in the downward direction, and the transmitted light makes the document visible from above. Therefore, the document irradiation surface light source 8
Is designed to have an illuminance that allows light to pass through the original, for example, 30 candela or more, preferably 50 to 500 candela.
The document irradiation surface light source 8 is fixed to the upper surface of the casing 2 and emits light upward. The document irradiation surface light source 8 is arranged in non-contact with the document table 1 so as not to interfere with the movement of the document table 1. The gap between the platen 1 and the casing 2 is
Usually, it is designed in the range of 3 to 10 mm. Therefore, the document irradiation surface light source 8 is designed so that the entire thickness thereof is thinner than the gap between the document table 1 and the casing 2. An EL light emitting element, a light source for irradiating the side surface of a light emitting plate with a cold cathode tube, a light source in which a large number of light emitting diodes are arranged, and the like can be used as the original irradiation surface light source 8 of this shape. The EL light emitting element is optimal because it can be thinned as a whole.

Ideally, the original irradiation surface light source 8 irradiates the entire surface of the original set on the transparent plate 1B. However, it is not always necessary to illuminate the entire surface of the original. This is because the central portion of the document can be illuminated and the document can be set at an accurate position. Therefore, the size of the document irradiation surface light source 8 is, for example, a square having a side length of 10 to 60 cm. Since the document irradiation surface light source 8 irradiates the document from below when setting the document on the transparent plate 1B, it is fixed to the setting position of the document table 1, that is, the right end portion of the casing 2 in FIG.

The document irradiation surface light source 8 is used only when a document is set on the transparent plate 1. When moving the document table 1, it is not necessary to turn it on. When the original is set on the transparent plate 1B, the lid 1C is opened. Therefore, if the original irradiation surface light source 8 is turned on when the lid 1C is opened, it can be turned on only when necessary. In order to realize this, as shown in FIG. 4, the switch 11 of the document irradiation surface light source 8 is fixed to the side surface of the casing 2. The switch 11 shown in this figure is turned on when the lid 1C is opened, and turned off when the lid 1C is closed. A non-contact type switch is used as the switch 11. Therefore, the magnet 12 is fixed to the lid 1C, and the switch 11 includes a sensor for detecting magnetism. This switch 11 has a magnet 1 when the lid 1C is opened.
2 is turned on and turned on, and when the lid 1C is closed, the magnet 12 is turned off and turned off. The switch 11 is for illuminating the document surface 8
When the light source is connected to the power source, the original irradiation surface light source 8 is turned on, and the original irradiation surface light source 8 is turned off. The non-contact type switch 11 is turned on / off by detecting the opening / closing of the lid 1C without restricting the movement of the document table 1.

Furthermore, FIG. 5 shows a switch 11 having another structure which can be opened and closed by opening and closing the lid 1C. The switch 11 includes a plunger 11A, and the plunger 11A detects opening / closing of the lid 1C. Switch 11
When the lid 1C is opened, the plunger 11A
It is pushed to the side of and turned on. When the lid 1C is closed, the plunger 11A is no longer pressed and the switch 11 is turned off. When the switch 11 is turned on, the document irradiation surface light source 8 is turned on, and when it is turned off, the document irradiation surface light source 8 is turned off.

Further, the silver salt type plate making machine shown in FIG.
A light source 3 for irradiating a document with scanning light from below is arranged in the center of the casing 2. The light source 3 irradiates a document set on the moving document table 1 with light. The light emitted from the light source 3 is reflected by the surface of the original set on the moving original table 1, and further reflected by the plurality of mirrors 4 to be applied to the master paper 5.

The master paper 5 is set in the loading section and is pulled out in synchronization with the movement of the document table 1.
After being drawn out, the master paper 5 irradiated with the light of the original document is developed, and after passing through the stabilizing portion 7, it becomes an original plate for offset printing.

The silver salt type plate making machine of this structure produces an original plate as follows. On the transparent plate 1B, a collimation paper (not shown) having translucency and printed with a grid-like reference line is placed. The collimation paper is provided with a hole for inserting the positioning pin provided in the frame member 1A, and the hole is inserted into the positioning pin to connect to the document table 1. Insert the document face down between the collimation paper and the transparent plate 1B. The document irradiation surface light source 8 is turned on. The downward facing document is illuminated by light from below, and the silhouette of the pattern printed on the upper surface is visible. Check the silhouette of the original and set it in the correct position according to the collimation paper. At this time, the collimation paper does not move, but the document moves left and right. To move the document without turning up the collimation paper, open a through hole through which the collimation paper can be reached. The through hole has a diameter of, for example, about 1 to 10 cm. When placing the original in the correct position, place the original 1 on the lid 1
Close C. In this state, the original is in a state of being pressed by the lid 1C and not displaced. In this state, the original table 1 is moved, and scanning is performed with light to expose the master paper 5 to produce an original plate for offset printing.

[0021]

The silver salt type plate making machine of the present invention is provided with a document irradiation surface light source between the casing and the document table. The document irradiation surface light source is arranged on the upper surface of the casing so that the document table can be moved. When the document irradiation surface light source provided here is irradiated with this, the document set on the document table can be irradiated with light from below. An original document illuminated with light from below has its pattern projected on the upper surface by the transmitted light. Therefore, it is possible to see the original set downward from above. That is, the document can be set on the platen while viewing the document facing downward. When the original is set in this manner, there is a feature that it is not necessary to use a set paper as in the conventional case, and the original can be set directly, easily and easily, and can be set at an accurate position.

Further, the silver salt type plate making machine of this structure is
Since the document irradiation surface light source is arranged between the casing and the document table, it is not necessary to arrange the light source in a narrow casing. Therefore, the casing can be designed compact and the upper half of the casing can be closed. Furthermore, a mechanism for irradiating the lower surface of the original with light for scanning, that is, a light source for scanning the original with light, a mirror, and a master paper loading unit are not limited, and an original irradiation surface light source can be provided. it can. Therefore, the design of the entire device is simple and there is a feature that it can be manufactured at low cost.

Furthermore, the original irradiation surface light source arranged outside the casing can be easily maintained. This is because the original irradiation surface light source can be repaired without opening a casing that is complicated and contains various mechanisms. Therefore, when the original irradiation surface light source is out of order, the original irradiation surface light source can be repaired so that the plate making machine can be used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional silver salt plate making machine.

FIG. 2 is a sectional view of a plate making machine according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a portion connecting the platen to a casing.

FIG. 4 is a cross-sectional view showing a portion for opening and closing a lid to turn on and off a document irradiation surface light source.

FIG. 5 is a perspective view showing a document table and a switch portion.

[Explanation of symbols]

1 ... Manuscript table 1A ... Frame material 1B ... Transparent plate
1C ... Lid 2 ... Casing 3 ... Light source 4 ... Mirror 5 ... Master paper 6 ... Development 7 ... Stabilizer 8 ... Original irradiation surface light source 9 ... Rail 10 ... Hinge 11 ... Switch 11A ... Plunger 12 ... Magnet

Claims (1)

[Scope of utility model registration request] 1. A casing (2), a platen (1) provided on the upper surface of the casing (2) so as to be horizontally movable and having a transparent plate (1B), and placed on the transparent plate (1B). The document is equipped with a light source (3) for irradiating light from below, a loading section for the master paper (5) that irradiates the light reflected by the light source (3), and a developing section for the master paper (5). A plate-making machine having the following configuration. (A) A document irradiation surface light source (8) is arranged between the transparent plate (1B) of the document table (1) and the casing (2). (B) The document irradiation surface light source (8) is fixed to the upper surface of the casing (2). (C) The document table (1) is horizontally movable above the document irradiation surface light source (8). (D) The document irradiation surface light source (8) is arranged at the setting position of the document table (1).