JPH11151796A - Thermal plate making apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a dead space and easily bring the heating acting part of a thermal head into contact with a platen by forming the platen from an elongated elastomer and subjecting the contact part with the acting part of the thermal head to friction treatment in a state holding thermal gauze bonded to a gauze frame between the thermal head and the platen. SOLUTION: A rod-shaped platen consists of a platen support member 213 and a platen main body and the platen main body comprises a frame 212 of which the lower part is opened by the bending molding of a metal thin plate and the hard rubber 211 attached to the upper part of the frame 212. A low friction tape 214 for enhancing the slip with thermal gauze 32 is bonded to the top part of the hard rubber 211. As a result, the dead space of the part approaching a gauze frame can be reduced and, when the heating acting part of a thermal head 10 is brought into contact with the platen, the contact can be facilitated because a projected part is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to a heat-sensitive gauze made by laminating a heat-sensitive film on a porous support (shape) made of a woven fabric such as silk, using a thermal head.
The present invention relates to a thermal plate making apparatus for producing a desired printing plate. More specifically, the present invention relates to a heat-sensitive plate-making apparatus of a type in which a heat-sensitive gauze stretched on a square frame (shape frame) is directly made using a thermal head having a length corresponding to the frame.

[0002]

2. Description of the Related Art A thermal plate making apparatus of this type includes:
Conventionally, there has been a thermal plate making apparatus shown in FIG. In this conventional apparatus, a thermal gauze 32 is stretched over a square gauze frame 31 as a thermal screen 30. This is fixed in place on the device. In this case, the roller-shaped platen 20 is placed in the frame of the gauze frame 31, and the thermal head 10 corresponding to the width of the gauze frame 31 is placed above the gauze frame 31 in a direction crossing the gauze frame 31 (this is assumed to be the X direction). ). The roller-shaped platen 20 pushes up and supports the thermal gauze 32 stretched on the gauze frame 31, and the thermal head 10 comes into contact with the raised thermal gauze 32. The plate making mechanism including the thermal head 10 and the platen 20 is configured to be synchronously (integrally) movable within the gauze frame 31 from one end to the other end in the Y direction orthogonal to the X direction. Have been.

The controller 41 includes a movement control unit 20 for moving the plate making mechanism and the thermal head 10 of the plate making mechanism.
Is issued to the heating control unit 43 for controlling the heating of the heating. The controller 41 obtains image data to be made from another computer or the like, performs necessary processing, and then gives respective commands to the movement control unit 42 and the heating control unit 43. The movement control unit 42 moves the plate making mechanism from one end to the other at a constant speed. The heating control unit 43 gives line data to be heated to the thermal head 10 one after another while the plate making mechanism is moving. Therefore, while the plate making mechanism is moving,
A perforation pattern related to printing is formed on the thermal gauze 32.

[0004] As another conventional example, there is a platen 20 using a rod-shaped plate instead of a roller-shaped platen. This platen had a shape in which the upper portion was depressed, and the heating action portion of the thermal head 10 was brought into contact with the thermal gauze 32 supported in the depressed portion.

[0005]

As described above, in any of the conventional apparatuses, a perforation pattern relating to printing can be formed directly or at once on the heat-sensitive gauze 32 stretched on the gauze frame 31 and is convenient. Although it is a device, it has the following disadvantages. That is, as shown in FIG. 3, when a platen having a relatively large diameter is used in a roller having a roller-shaped platen, a large dead space is generated at one end and the other end of the gauze frame 31. Was. In the case of using a bar-shaped platen having a depression, the dead space can be reduced, but there is a disadvantage that it is difficult to accurately position the heating section of the thermal head 10 in the depression. Was. The present invention has been made to improve these points.

[0006]

For this reason, in the present invention, an elongated elastic body made of, for example, hard rubber is used as a platen, and these elastic bodies can be easily exchanged. The present invention relates to a flexible elastic body mounting structure.

[0007]

The dead space can be reduced in the gauze frame by using an elongated elastic body as the platen, and the contact of the heating unit of the thermal head with the elastic body supporting the thermal gauze is facilitated. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. Here, FIGS. 1 and 2 are explanatory views of the configuration of a rod-shaped platen showing a first embodiment of the present invention, FIG. 4 is an explanatory view of the configuration showing a second embodiment of the present invention, and FIGS. FIG. 11 is a configuration explanatory view showing a third embodiment of the present invention.

First, a first embodiment of the present invention will be described with reference to FIGS. The rod-shaped platen 21 according to the first embodiment includes a platen support member 213 and a platen body 210.
Consists of The platen main body 210 includes a frame 212 having a lower portion opened by bending a thin metal plate, and a hard rubber 212 attached to an upper portion of the frame 212. Further, the platen support member is attached to the housing of the plate making mechanism, and the central portion is the frame 21.
The protrusion is formed with a width corresponding to the width of No. 2.

[0010] The frame 212 opened below the platen body 210 is inserted into the protruding portion of the platen support member 213 to function as a platen. By forming the frame 212 from a thin metal plate, the frame 212 has the property of a leaf spring, and the platen body 210 is connected to the platen support member 2.
13 can be firmly fixed.

FIG. 2 is a sectional view showing the operation of the platen according to the first embodiment. In addition, a low friction tape 214 is attached to the top of the hard rubber 211 of this embodiment to improve the sliding with the thermal gauze 32. Since the dead space in the portion close to the gauze frame 31 can be reduced, and when the heating section 101 of the thermal head 10 is brought into contact with the platen, there is no projecting portion as compared with the conventional platen having a depression. , Can be easily abutted.

FIG. 4 relates to a second embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the surface of the upper hard rubber 211 has a planar configuration. In this way, by adopting a planar configuration, the heating action portion 101 can be more easily brought into contact with the first embodiment than in the first embodiment. That is, in the first embodiment, since the shape of the surface of the hard rubber 211 is a circular arc, an adjustment is required to bring the heating action portion 101 of the thermal head into accurate contact with the top. In the embodiment, this adjustment can be almost omitted.

FIGS. 5 and 6 relate to a third embodiment of the present invention. This embodiment device is a platen formed according to the first embodiment or the second embodiment.
One piece with a length of 5a, two pieces with a length of 2a, 1
Each one having a length a is prepared. And these are connected by screwing to a pedestal, and a platen of a required length can be obtained. By using these, as shown in FIG. 6, a platen having a length from 5a to 10a can be formed stepwise. As described above, by using the platens of each combination, even if the gauze frame 31 shown in FIG. 3 is narrow, the same apparatus can cope with it.

In each of the embodiments described above, there is an advantage that the roller deflection which may occur when a roller-shaped platen is used does not occur. Since the roller-shaped platen is supported at both ends, the longer the width, the more easily the deflection occurs. As in the above-described embodiments, the platen support member is provided upright over the entire length thereof, so that no bending occurs.

[0015]

As described above, according to the present invention,
The dead space can be reduced with respect to the heat-sensitive gauze stretched over the gauze frame, and the heating action of the thermal head can be easily carried out when the heating gauze comes into contact with the platen.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a platen structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining the operation of the platen of FIG.

FIG. 3 is a perspective view showing a main part of a conventional thermal plate making apparatus.

FIG. 4 is a sectional view showing a platen structure according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a main part showing a platen structure according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a main part showing a method for changing the length of the platen in FIG. 5;

[Explanation of symbols]

10: Thermal head 20: Platen 30: Thermal screen 40: Control circuit

Claims (3)

[Claims] A plate making mechanism comprising: a thermal head having a length corresponding to at least a width of the thermal gauze stretched on the frame;
In a thermal plate making apparatus that creates a plate image while relatively moving the thermal gauze stretched on the frame while sandwiching the thermal gauze stretched on the frame with the thermal head and platen of the plate making mechanism, A heat-sensitive plate-making apparatus characterized in that said platen is formed of an elongated elastic body, and a contact portion, which is in contact with an action portion of said thermal head, is subjected to a low friction treatment with a heat-sensitive gauze stretched on said frame. 2. A plate making mechanism comprising: a thermal head having a length corresponding to at least a width of the thermal gauze stretched on the frame;
In a thermal plate making apparatus that creates a plate image while relatively moving the thermal gauze stretched on the frame while sandwiching the thermal gauze stretched on the frame with the thermal head and platen of the plate making mechanism, The platen includes a platen support member having an elongated protruding tip, and a frame having an elongated elastic body at the tip and having a rear end having an opening corresponding to the width of the protruding tip. A heat-sensitive plate-making apparatus, wherein an opening of the frame is fitted into a protruding tip of the platen support member. 3. A thermal plate making apparatus according to claim 2, wherein said contact portion is a flat surface.