JPH045321Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stencil-making device for stencil printing.

Since stencil printing is relatively simple and inexpensive among printing methods, it is used for printing flyers, pamphlets, etc. This stencil printing uses a stencil printing original plate in which the image to be printed is formed by ink-permeable through holes, and printing ink is applied to the original plate with printing paper superimposed on the original plate, and the printing ink is applied to the through holes. This is a method in which a printed image is formed by passing the material through the paper and adhering it to the printing paper.

In the conventional method of manufacturing a stencil printing master,
As shown in FIG. 6, a heat-sensitive layer 1 made of synthetic resin
The surface of the original 2 to be copied is brought into close contact with the surface of the heat-sensitive layer 11 of a light-transmissive stencil 1 made of a laminate of 1 and a porous support 12 into which printing ink permeates. Light including infrared IR from a flash discharge lamp is irradiated onto the document surface of the document 2 through the stencil 1, and the image portion 21 in the heat-sensitive layer 11 is heated by the heat generated by the infrared absorption in the black image portion 21 of the document 2, for example. An ink-permeable through hole 13 is formed in a portion facing the stencil plate, and a stencil printing original plate 10 is manufactured as shown in FIG.

Incidentally, the stencil 1 is often integrated with the mount 3 as shown in FIG. It is held between the This holding prevents the original 2 from shifting its position, and furthermore, when arranging multiple small-sized originals 2 to form a new original, the mount 3
It would be convenient if it were integrated with the mount 3.
is not necessarily necessary.

By the way, this original plate 10 manufacturing device has a wide endless belt wrapped around a cylindrical transparent body, a plurality of fixed rollers, and a tension roller. In many cases, the stencil 1 is held under pressure with the body and irradiates light including infrared rays toward the stencil 1 through a transparent body. In this plate-making apparatus, the fixed roller and the transparent body are each rotatably installed on the frame. This transparent body is a cylindrical tube made of glass, but since its cross section is not perfectly circular, the structure for rotatably attaching it to the frame is complicated. To explain this with reference to FIG. 5, a thin sheet 31 made of flexible rubber or the like is wrapped around the end of the transparent body 4, and a thin metal sleeve 32 is fitted onto it.
Several screws 34 are screwed into the rotary cylinder 33 and the sleeve 32 is fixed while aligning. The rotating cylinder 33 is fitted into a bearing 35 and rotatably supported by the frame 40. Therefore, not only is the structure complicated, but also it is difficult to align the axes of the transparent body 4 and the rotary cylinder 33, and when the belt meanderes, the force in the axial direction acts on the transparent body 4. This may cause the transparent body 4 to crack from the end surface. Furthermore, there was also the problem that a large bearing 35 was required, resulting in high cost.

The present invention has been devised in view of these circumstances, and it is an object of the present invention to provide a stencil-making device for stencil printing that is simple in structure, does not require centering of a transparent body, and is low in cost. For this purpose, a wide endless belt is stretched around a cylindrical transparent body, multiple fixed rollers, and a tension roller, and the combination of document and stencil is held under pressure between the belt and the transparent body. In a plate-making device that irradiates light including infrared rays to the stencil through a transparent body, two of the fixed rollers have a large-diameter flange portion and a small-diameter support portion at both ends. A support ring with a two-stage diameter is loosely fitted and held, and the small-diameter support portions of the support ring are brought into contact with both ends of the transparent body, and the axial movement of the transparent body is restricted by the large-diameter flange, and This is achieved by a stencil printing apparatus characterized in that the endless belt rotatably holds the transparent body by contacting the transparent body over half its circumference.

The present invention will be specifically described below based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a frame 40 inside the device
Three fixed rollers 61, 62, 63 and one tension roller 64 are rotatably supported. Then, a transparent body 4 and four rollers 6
A wide endless belt 5 is wrapped around 1, 62, 63, and 64.
The transparent body 4 is held in contact with more than half its circumference, and both ends of the transparent body 4 are not supported by the frame body 40. A support ring 7 is loosely fitted to both ends of the rollers 61 and 62 so as to be freely rotatable and immovable in the axial direction. As shown in FIG. 3, this support ring 7 has a two-stage diameter structure including a large-diameter collar portion 71 and a small-diameter support portion 72. As shown in FIGS. 2 and 4, the support portion 72 is in contact with the transparent body 4, and the large-diameter flange portion 71 is located at a position with a predetermined clearance from the end of the transparent body 4. be. The tension roller 64 is resiliently biased by a tension spring 9, and tension is applied to the belt 5. Therefore, the transparent body 4 firmly contacts the four support rings 7 and is held by the belt 5 at the same time, so that the position of the transparent body 4 is determined even if it is not supported by the frame 40. Inside the transparent body 4, a flash discharge lamp 41 as an infrared radiation source and a mirror 42 surrounding it are arranged. Furthermore,
Near the transparent body 4, a carry-in chute 81 and a carry-out chute 82 are provided in two stages, upper and lower.

Next, the roller 61 is a driving roller, and the driving force of a motor (not shown) is transmitted to the sprocket 61a, causing the roller 61 to rotate in the direction of the arrow. Along with this rotation, the belt 5 comes into pressure contact with the surface of the transparent body 4 and runs while rotating together with the transparent body 4. When the combination W of the document 2 and the stencil 1 is inputted from the carry-in chute 81, the combination W is transferred to the transparent body. 4 and belt 5, and during this time it is irradiated with light including infrared rays from a flash discharge lamp 41. As a result, the heat-sensitive layer 11 is perforated as explained in FIG.

In this way, the transparent body 4 is in contact with the four support rings 7 and at the same time the belt 5 is in contact with the transparent body 4 for more than half the circumference and holds the transparent body 4, so that the transparent body 4 can be accurately positioned even if it is not supported by the frame body 40. is determined. Since the flange 71 of the support ring 7 is located at the end face of the transparent body 4 with a predetermined clearance, even if the belt 5 meanders and the transparent body 4 attempts to move in the axial direction, the flange 71 prevents the transparent body 4 from moving in the axial direction. Movement is regulated. Therefore, the support structure for the transparent body 4 becomes very simple, and since no large bearings are required, the cost is also reduced. Furthermore, even if there is a large variation in the outer diameter of the transparent body 4, alignment work for support is not required, and assembly is simplified. Furthermore, since the support of the transparent body 4 is not mechanically inflexible as in the conventional case, there is an advantage that accidents of the transparent body 4, which is a glass tube, breaking are reduced.

[Brief explanation of the drawing]

Figure 1 is a side view of the embodiment of the present invention, Figure 2 is a front view, Figures 3 and 4 are explanatory diagrams of the main parts, and Figure 5
The figures are explanatory sectional views of conventional examples, Figures 6, 7, and 8.
The figure is an explanatory cross-sectional view of the original plate. 1...Stencil, 10...Original plate, 2...Manuscript, 4...Transparent body, 41...Flash discharge lamp, 5...
Belt, 61, 62, 63...Fixed roller, 6
4...Tension roller, 7...Support ring,
71... collar section, 72... support section.

Claims (1)

[Scope of Utility Model Registration Claim] A wide endless belt is stretched around a cylindrical transparent body, a plurality of fixed rollers, and a tension roller, and the document and stencil combination is sandwiched between the belt and the transparent body. In a plate-making device that irradiates light including infrared rays toward the stencil through a transparent body, two of the fixed rollers have a large-diameter flange and a small-diameter flange at both ends. A two-stage diameter support ring having support portions is loosely fitted and held, and the small diameter support portions of the support ring are brought into contact with both ends of the transparent body, and the axial movement of the transparent body is restricted by the large diameter flange. A plate-making device for stencil printing, characterized in that the endless belt rotatably holds the transparent body by contacting the transparent body over half the circumference or more.