JPS59193437A - Thermal copying device - Google Patents

Abstract

PURPOSE:To obtain a titled device which is scarcely soiled and wiped off easily by forming an opposed surface of an optical transmission plate of a pressure plate, by a woven cloth coated with a fluorine resin. CONSTITUTION:A light source box 1 has a light source device 3 like a xenon discharge tube and a reflector 4 in its inside, and emits a light toward an optical transmission plate 2. A pressure plate 5 is fixed and placed on the upper part of the optical transmission plate 2, fixed to an upper bar C attached so as to be freely opened and closed to the upper part of a frame body F, the pressure plate 5 is a cushion member 6 provided with flexibility and rubber-like elasticity like a sponge, and the lower bottom face to its optical transmission plate 2 is covered with a cover sheet 7. Its cover sheet 7 is constituted of a woven cloth coated with a fluorine resin, and the woven cloth is constituted of a glass fiber, a carbon fiber, a polyamide fiber, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal copying apparatus, and more particularly, a polymer of an original sheet and a thermal copying sheet is pressed between a light transmitting plate and a pressing plate, and The present invention relates to a press plate of a thermal copying apparatus configured to irradiate light onto the original sheet via the thermal copying sheet.

A document comprising a light transmitting plate (installed in a light irradiation window) and a pressing plate provided opposite to the light transmitting plate, the light absorbing image area being tilted to the right by the light transmitting plate and the pressing plate. A polymer of the sheet and a light-transmitting thermal copying sheet is pressed together, and a light beam is irradiated from the light-transmitting plate side through the thermal copying sheet toward the original sheet, so that the image area of the original sheet is exposed to light energy. There is known a thermal copying apparatus configured to provide a copy image by perforating the thermal copying sheet or changing its color or shrinkage due to temperature increase in the image area caused by absorption of the image area. In addition to producing copies, it is also used as a V-selling machine for making stencils using stencil printing and thermal copying.

In the thermal copying apparatus described above, in order to obtain a high-resolution, beautiful, and high-quality double image, the original sheet and the thermal copying sheet must be in uniform contact with each other, and the original sheet must be in close contact with the original sheet. It is required that the heat absorbed by the image area be uniformly and well transferred to the thermal copying sheet, and for this reason, conventionally, the light transmitting plate has been made of a rigid body such as a glass plate, whereas the suppressing plate (
It is made of a sponge-like material with flexibility and rubber-like elasticity. Since the pressing plate becomes quite hot, albeit momentarily, even when exposed to flash light from a chilenon discharge tube, etc., the pressing plate is required to have excellent heat resistance from the viewpoint of durability. In order to effectively utilize the thermal energy of the light beam for thermosensitive copying, it is preferable that the surface of the suppressor plate facing the light transmitting plate not only be light reflective but also have excellent thermal insulation properties.

In plate-making by thermal perforation copying of base paper for stencil printing, when a thermal copy sheet without a white paper mount on one side (@ side) is used, the original sheet is a thermal copy sheet. If the size is smaller than the size of the sheet 1-, the thermal copying sheet is in direct contact with the surface of the opposing surface/portion of the pressing plate;
Therefore, in order to prevent the thermal copying sheet from sticking to the surface of the suppression plate, the surface of the suppression plate is required to have good removability. If the dust adheres to the surface, the dust may absorb light on the surface, forming an unnecessary dotted copy image on the thermal copying sheet, especially if the thermal copying sheet is a stencil printing base paper. When used as a printing press, dotted printed images called pinballs are formed in the margins of the printing paper due to the dotted copied images (A), making it difficult to obtain beautiful, high-quality printed matter. As mentioned above, the effects of fc m dust adhering to the surface of the press plate are particularly noticeable.
Such as a thermal copying sheet used as a base paper for stencil printing, the thermal copying sheet is composed of a stretched thermoplastic synthetic resin film alone or a laminate of a thermoplastic synthetic resin film and porous paper. In this case, even if the dust adhering to the surface of the suppression plate is so small that it is difficult to see it with the naked eye, if it is light-absorbing, it will cause heat-sensitive perforations in the film. The perforations thus formed in the film are enlarged as the film is stretched;
It tends to be magnified enough to be visible to the naked eye. Therefore, it is preferable that dust and the like adhere to the surface of the opposing surface of the pressing plate and move, and that even if dust or dirt occurs, it can be wiped off relatively easily.

The surface material of the press plate of a thermal copying device that has been commonly used in the past does not meet all of the above requirements, and in many cases does not have sufficient removability and is easily soiled by dust. It has been wiped down and is the same.

The present inventor conducted trial-and-error experimental research using various surface materials in order to find a preferable surface material for the suppression plate that satisfies all of the above-mentioned requirements.

As a result, the inventor of the present invention was able to find a desirable surface material for a pressure plate that satisfies all of the above-mentioned requirements.1. :
.

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal copying apparatus equipped with a preferable pressure plate surface material that satisfies the above-mentioned requirements found through the above-mentioned experimental studies.

According to the present invention, this object includes a light transmitting plate provided on a light irradiation window and a suppressing plate provided opposite to the light transmitting plate, and the light transmitting plate and the pressing plate suppress light. A polymer sheet having an absorbent image area is sandwiched between a polymer sheet and a thermal copying sheet, and a light beam is irradiated from the light transmitting plate side through the thermal copying sheet toward the document sheet so as to cover it. This is achieved by a thermal copying apparatus constructed in such a manner that the surface of the pressing plate facing the light transmitting plate is made of a woven fabric coated with a fluororesin.

The woven fabric is placed on the opposing surface of the pressing plate whose base is an elastic body with flexibility and rubber-like elasticity like a sponge. It does not impair its flexibility and rubber-like elasticity, and its surface is coated with fluororesin, so it has excellent heat resistance and heat insulation properties.Moreover, the woven fabric has excellent releasability due to the coating of fluororesin. In addition, since the fluororesin-coated sheet has a smooth surface and has a small contact area with the thermal copying sheet 1-, the thermal copying sheet will not stick strongly to the woven fabric. Cloth has extremely excellent releasability.Furthermore, as mentioned above, woven fabric has a small contact area with the thermal copying sheet, and forms an insulating air space between the suppression plate and the thermal copying sheet, so it can be easily removed from the thermal copying sheet. The heat insulation between the layers is further improved, and the energy of the light rays irradiated from the light transmitting plate side toward the polymer is efficiently and effectively used for thermal copying, resulting in clear copied images with high resolution.
or it becomes possible to reduce the amount of irradiation light.

As mentioned above, the mesh of the woven fabric used as the surface material of the suppression plate is preferably 40 or more and 100 or less,
If the number of meshes is 100 or more, the above-mentioned effect will not be obtained, and if the number of meshes is less than 40,
Deterioration of the resolution of the copied image is observed.

Fluororesin has an extremely low coefficient of friction and high surface smoothness.Woven fabrics coated with fluororesin are less likely to attract dust to the surface, and even if scratches occur, they will be impregnated. The dirt can be easily wiped off with a cloth or the like.

The fibers of the woven fabric may be those that can withstand the temperature during coating with fluororesin and have flexibility and flexibility, such as glass fibers, carbon fibers, polyamide fibers, or There are strands of yarn.

Further, it is preferable that the woven fabric has air permeability between the front and back surfaces thereof. If the woven fabric has air permeability between the front and back sides, even if the moisture and oil contained in the original sheet evaporates due to exposure, the vapor will pass through the woven fabric and dissipate. The adhesion between the original sheet I and the thermal copying sheet does not deteriorate due to steam pressure, and in particular, the centering process ( ) of a solid image is avoided, and a good copy image with high resolution can be obtained.

In addition, the woven fabric has been coated with fluororesin in advance.
It may be a plain weave or special weave of R chicks, or a fabric made of plain or special weave of fibers coated with a fluororesin.

Referring to the figures attached below, the present invention will be described in detail with reference to embodiments.

The attached figure A shows one embodiment of a thermal copying apparatus according to the present invention. In the figure, reference numeral 1 indicates a light source box, which is provided within the frame F and has an opening on the top.
The light irradiation window has a light irradiation window, and a light transmission plate 2 made of a transparent glass plate or the like is provided on the light irradiation window. The light source box 1 has a source device 3 such as a xenon discharge tube and a reflecting mirror 4 therein, and is configured to emit light toward a light transmitting plate 2.

A suppressing plate 5 is fixedly arranged above the light transmitting plate 2.

The pressing plate 5 is fixed to an upper bar C that is openable and closable at the upper part of the frame E, and includes a cushion member (base) 6 having flexibility and rubber-like elasticity like a sponge. The cushion member has a lower bottom surface facing the light transmitting plate 2,
The lower bottom surface is coated with No. J Vercy 1-7.

That is, the surface of the pressing plate 5 facing the light transmitting plate 2 is constituted by a cover sheet 7, and the cover sheet is constituted by a woven fabric coated with a fluororesin. The woven fabric constituting the cover sheet 7 may be glass fiber, carbon fiber, polyamide fiber, or a plain weave or special weave of glass fiber, carbon fiber, polyamide fiber, or a special weave coated with fluororesin.
Alternatively, it is a white woven fabric made by plain weaving or special weaving of the above-mentioned fibers coated with fluororesin or their twisted yarns, and the mesh size is set to about 40 to 100.

The light source box 1 is supported by a frame F so as to be movable in the vertical direction as shown in the figure, and is fixed to the light source box)
The follower rod 8 engages with the cam 9, and the rotation of the cam causes the light transmitting plate 2 to move over the suppressing plate 5 as shown in the figure.
The light transmitting plate 2 is driven between a lowered position away from the Y-bar sheet 7 and a 1-segment position where the light transmitting plate 2 is pressed against the cover sheet 7 of the suppression plate 5 by moving upward in the figure from the lowered position. ing.

The cam 9 is drivingly connected to an electric motor 10 and is driven to reciprocate and rotate by the electric motor.

A document insertion table 11 is provided on one side of the light source box 1, and a thermal copy sheet storage section 12 is provided below the document insertion table 11. Continuous sheet-shaped thermal copying sheets S are stored.

The thermal copy sheet S stored in the thermal copy sheet storage section 12 is guided by a pair of guide rollers 14 and sent onto the light transmitting plate 2 of the light source box 1, and is inserted into the thermal copy sheet and the pusher from the document insertion table 11. It is adapted to engage with one side of the original sheet O inserted between the plate 5 and the plate 5.

The lower roller 14a of the pair of guide rollers 14 is rotatably supported directly by the frame F, whereas the upper roller 14b is pivotally supported by the upper cover C by a pivot 16 and rotatably by the lever 17. It is supported and the lever 17
is rotatably attached to the frame F by an engaging piece 18 provided integrally with the frame body F by a pivot @19 (-1<i) so as to selectively engage with one end of the push-up lever 2o. When the solenoid 21 drivingly connected to the lever is not energized, the lever 2o is rotated counterclockwise in the figure from the rotational position shown in the figure by the spring 22 (J). The lever 17 and the upper roller 14b are separated from the lower roller 14a so that the original sheet O can be easily inserted between the light transmitting plate 2 and the suppressing plate 5. On the other hand, when the solenoid 21 is not energized, At the rotational position as shown in the figure, the upper roller 1/Ib is disengaged from the engagement piece 18, and the lower roller 14a is moved by its own weight.
It is designed to be freely allowed to engage with.

On the other side of the light source box 1 are a thermal copying sheet [- a pair of feeding rollers 24, a cutter device 27, and a thermal copying sheet].
- A discharge table 3o is provided.

The feed roller pair 24 includes a lower roller 24a rotatably attached to the frame F and a lower roller 24a rotatably attached to the upper cover C.
an upper roller 241) and a lower roller 24a
is drivingly connected to an electric motor 2G by a belt type transmission device 25, and selectively rotated by the electric motor in a direction around δ1 counterclockwise in the figure.

The cutter device 27 includes a rotary blade 27a rotatably attached to the frame F and a fixed blade 27b attached to the upper cover C.
The rotating blade 27b is drivingly connected to the lower roller 24a via a clutch 28 and two belt transmission devices, and selectively rotates as the lower roller rotates, and the fixed blade 27b
7b to cut the thermal copying sheet S.

The pair of feed rollers 24 is located below the light transmitting plate 2, and therefore, the thermal copying sheet S that has passed over the light transmitting plate 2 passes through the separating protrusion 23 attached to the side edge of the light source box 1 and passes through the pair of feed rollers 24. By moving toward the ridge, the separation protrusion 23 is bent downward at a relatively large angle in the figure. The upper cover C has a document sheet exit passage 3 extending diagonally above the portion corresponding to the protrusion 30.
The original sheet ejection guide plate 32 that defines the
is being pulled.

Next, the operation of the thermal copying apparatus having the structure shown in (e) above will be explained.

The original sheet O to be subjected to thermal copying is placed on the original placing table 11 with the original image side facing downward, and the thermal copying sheet S, which is guided to the original insertion table and placed on the light transmitting plate 2 in advance, is placed on the original placing table 11 with the original image side facing downward. and the cover sheet 7 of the suppression plate 5.

When a predetermined amount of document sheet 0 is inserted and its leading end is located near the separation protrusion 23, the electric motor 10 causes the cam 9 to move.
rotates clockwise in the figure, and as a result, the light source box 1 rises, and the portion of the polymer of the original sheet O and the thermal copying sheet S that is between the light transmitting plate 2 and the suppressing plate 5 is The light source 3 emits light in this pinched state, and a light beam passes through the light transmitting plate 2 and the thermal copying sheet S and is irradiated onto the original image surface of the original sheet O.
As the temperature of the light-absorbing image area of the original sheet increases, holes having the same shape as the image area are thermally punched in the thermal copying sheet S. After the light source 3 is emitted, the cam 9 is rotated by the electric motor 110 in the counterclockwise direction as shown in the figure, so that the light source box 1 is lowered FL, the light transmitting plate 2 is separated from the suppressing plate 5, and the original sheet is removed. The pinch pressure between O and the thermal copying sheet S is released. Next, the feed roller pair 2 is
The lower roller 24a of No. 4 is driven in the counterclockwise direction as shown in the figure, and the thermal copying sheet S is fed by one exposure () by the roller No. 1, and at the same time, the original sheet O is moved from the thermal copying sheet S. The original sheet is peeled off R1 and guided by the original sheet ejection guide plate 32, and then heads toward the output sheet passage 31.

Above) As shown in E, the exposure for thermal copying is on the original sheet t-0.
The polymerization process was carried out under a condition in which a polymer of and thermal copying sheet-S was pressed between a light transmitting plate 2 and a suppressing plate 5, and the surface of the pressing plate 5 facing the light transmitting plate 2 was coated with fluororesin. Since the cover sheet 7 is made of woven fabric, the light rays emitted by the light source 3 are effectively used for thermal copying due to the heat insulating properties of the cover sheet 7. image> is formed on the thermal copying sheet [~S.

If the width of the original sheet L-0 is equal to or larger than the width of the thermal copying sheet L-8, the thermal copying sheet L-8 will not come into direct contact with the pressing plate 5. However, if the width of the original sheet O is smaller than the width of the thermal copying sheet S, the thermal copying sheet S comes into direct contact with the suppression plate 5 at its side edges, but the contact surface is coated with fluororesin. Since the cover sheet 7 is made of a textured woven fabric, it has good releasability, and the thermal copying sheet S does not strongly adhere to its surface. Furthermore, the sheet cover 7 is not easily soiled due to its material, and beautiful thermal copies can be obtained without unnecessary copied images due to dirt.

J: The pressing plate 5 is attached to the upper part 7J bar C which can be opened and closed with respect to the frame F, and when the upper cover 〇 is in the open position, the covers 1 to 7 of the pressing plate 5 are opened to the outside, Wiping it off is now easy.

In the above, the present invention has been explained in detail with reference to specific embodiments, but the present invention is not limited to these and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

The accompanying drawing is a schematic longitudinal sectional view showing a second embodiment of a thermal copying apparatus according to the present invention. 1... Light source box, 2... Light transmission plate, 3... Light source. 4...Reflector, 5...Press plate, 6...Cushion member. 7...Cover sheet, 8...) J Mfiloa rod, 9...Cam, 10...Electric (electronic), 11...Document insertion table, 12...Thermal copying sheet storage section, 13 ...
Bobbin, 14... Guide roller pair, 16... Pivot, 1
7...Lever, 18...Engagement piece, 19...Pivot,
20... Push-up lever, 21... Solenoid, 22
...Spring, 23...Separation protrusion. 24... Feed roller pair, 25... Bell 1-transmission device, 26... Electric motor, 27... Cutter device, 28...
·clutch. 2...Transmission device, 30...Thermal copy sheet discharge stand. 31... Manuscript sheet U (exit path, 32... Manuscript sheet ejection guide plate patent applicant: Sokusori Gaku Kogyo Co., Ltd.)
Patent Attorney Masaki Akashi 21

Claims (1)

[Scope of Claims] (1) A light transmitting plate provided on a light irradiation window and a suppressing plate provided opposite to the light transmitting plate, wherein light is absorbed by the light transmitting plate and the suppressing plate. A polymer of an original sheet and a thermal copying sheet having a transparent image area is pressed together, and a light beam is irradiated from the light transmitting plate side through the thermal copying sheet and toward the original sheet. A thermal copying apparatus, characterized in that a surface of the pressing plate facing the light transmitting plate is made of a woven fabric coated with a fluororesin. (2. Claim 1) In the thermal copying apparatus described in Claim 1 or 2, the woven fabric is a woven fabric of 40 to 100 meshes. 1. A thermal copying apparatus characterized in that said woven fabric has air permeability between the front and back surfaces thereof.