JP2000079748A - Method and device for stencil printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a printing without cutting a stencil master by performing the printing on a printing paper in such a manner that an ink is made to seep out through an ink permeable belt and the stencil master. SOLUTION: A thermoplastic resin film 43 is perforated by a thermal head 57 while moving to the right, and is fitted at a specified location of a printing portion 40. A printing paper 46 is fed out sheet by sheet by a feeding roll 55, and the distal end portion of the printing paper 46 comes into contact with a press belt 45 through a guide 54. At least one portion of the press belt 45 has vent holes which continue in the thickness direction, and an internal portion 60 which is surrounded by the press belt 45 is kept under a lower air pressure than the outside, and the printing paper 46 moves to a specified location following the movement of the press belt 45 while being attracted by the press belt 45, and stops. Then, a press unit 41 ascends, and comes into contact with the printing portion 40. An ink roller 48 held by a supporting body 53, which is slidable in the lateral direction on a slide bar 52, performs a printing while pressing an ink permeable belt 44 with a proper force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stencil printing method and an apparatus therefor.

[0002]

2. Description of the Related Art FIG. 18 is a view schematically showing an outline of a conventional stencil printing machine in which a stencil making section and a printing section are housed in the same machine. In the figure, reference numeral 70 denotes a stencil master, 71 denotes a master supply unit for winding and accommodating an unperforated stencil master 70, 72 denotes a plate making unit having a pteran roller 72a and a thermal head 72b, and 73 denotes a cut perforated stencil master 70 Cutter mechanism, 74 is a transport mechanism for the stencil master 70, 75 is a printing unit, 76 is a plate cylinder, 76a is a peripheral wall, 77 is a plate discharging unit,
Reference numeral 78 denotes printing paper. In this device, the master supply unit 7
The stencil master 70 supplied from 1 is heat-perforated by the stencil making unit 72, and the heat-perforated stencil master 70 is conveyed to the plate cylinder 76 of the printing unit 75 by the conveying mechanism 74, and then is cut by the cutter mechanism 73. It is cut as a stencil master for the number of sheets, and it is wrapped around the peripheral wall portion 76a of the plate cylinder 76, and the printing unit 75
Stencil printing is performed on the printing paper 78 sent to the printer. After the printing is completed, the used master is discharged to the plate discharge unit 77.

However, as shown in FIG. 18, conventionally, stencil printing masters (base papers) are cut one by one after plate making.
There is a problem in that it is difficult to transport the sheet inside the machine, to attach it to the plate cylinder, and to discharge the plate (in short, handling the thin sheet master).

In order to solve these disadvantages, Japanese Patent Laid-Open Publication No. Hei.
Japanese Patent No. 73987 proposes a stencil printing machine in which a stencil master supply / discharge unit and a stencil making unit are provided on the outer peripheral wall of a plate cylinder, and the stencil master is made long without making the stencil master. Have been. FIG. 19 shows a side cross section of the stencil printing machine. This device is a plate cylinder unit 80
The plate cylinder 80d is attached to the rotating side plate 80c of
0d, the plate feeding / discharging unit 81 is also
0c, the plate cylinder unit 80 is
It can rotate relatively to the ink supply means 87 inserted in d. The plate supply / discharge unit 81 has a master supply unit 83 for winding and accommodating a stencil master 82, a platen roller 84, a thermal head 85, and a plate discharge winding unit 86 for winding a used master. Further, a part 80b of the peripheral wall portion 80a of the plate cylinder unit 80 is configured to be ink-permeable, so that the ink supplied from the ink supply means 87 is supplied to printing paper (not shown) therefrom. ing.

However, in the stencil printing machine described in the above publication, even the thermal head of the stencil unit is incorporated in the stencil feeding / discharging unit. Therefore, the weight of the stencil unit becomes heavy and the plate cylinder unit rotates smoothly. However, there are disadvantages such as difficulty in wiring, transmission of signals to the thermal head becomes difficult, and foreign matter such as paper dust adhering to the thermal head and causing a perforation trouble.

In order to improve these disadvantages, Japanese Patent Application Laid-Open No. Hei 6-247024 shown in FIG. 20 proposes that the perforating means is arranged outside the rotation system of the plate cylinder and fixed to the machine body. In this case, wiring to the thermal head becomes easy. In FIG. 20, 1 is a plate cylinder unit,
4 is a shaft, 8 is a plate cylinder, 9 is an ink-permeable peripheral wall, 10 is an ink supply unit, 20 is a plate supply / discharge unit, 21 is a stencil master, 22 is a master supply unit, 23 is a pteran roller,
Numeral 24 indicates a plate discharging take-up unit, numeral 30 indicates a thermal head unit, numeral 31 indicates a thermal head, and numeral 31 'indicates a forward position of the thermal head.

However, also in this case, a plate feeding / discharging unit 20 such as a roller-shaped master, a platen roller for a thermal head, and a component for plate discharging is outside the plate cylinder 8,
Since it rotates with the plate cylinder, it is still heavy and
Similarly to the above, the press roller for pressing the printing paper against the master wound around the plate cylinder needs to repeat the operation of largely separating from the plate cylinder every rotation of the plate cylinder in order to escape from the plate feeding / discharging unit. is there. This causes problems such as an increase in the size of the printing press, generation of noise, and complexity of the apparatus. Although there is a possibility that the press roller is made thicker and a notch is made to escape from a roller-shaped master or the like, it is unavoidable to increase the size and cost of the printing press.

As another means, there is a proposal to place a roller-shaped master or the like inside the plate cylinder. However, this also requires that the ink roller inside the plate cylinder must exceed this protrusion every rotation of the plate cylinder. Generation of noise and complication of the device are inevitable.

[0009]

Accordingly, the first aspect of the present invention is as follows.
The purpose of the present invention is to address these problems of the prior art.Since printing can be performed without cutting the stencil master, even a stencil master with a small stiffness such as a single film can be transported, and complicated There is no need for a plate and a plate discharging mechanism, the weight of the rotating plate cylinder unit is not heavy, wiring to the thermal head is not difficult, paper dust is not mixed in, there is no need to avoid every press roller rotation, and the ink roller An object of the present invention is to provide a stencil printing method and apparatus that require a small amount of avoidance movement for each rotation. A second object of the present invention is to provide a stencil printing method and apparatus applicable to multi-color printing. A third object of the present invention is to provide a stencil printing method and apparatus capable of performing simultaneous double-sided printing while minimizing the size of the printing press, generating noise, and complicating the apparatus.

[0010]

According to the present invention, first, an ink permeable belt is stretched, and the ink permeable belt is stretched on one side of the ink permeable belt between a feeding portion and a pulling portion. By forming a printing section by mounting the stencil master, addressing the printing paper to the stencil master, and moving the ink supply means while contacting the ink permeable belt,
A stencil printing method is provided, wherein ink is leached through the ink permeable belt and the stencil master to perform printing on the printing paper.

Secondly, the ink permeable belt is stretched so as to have the opposite surface, and the stencil master which is unrolled from any of the opposed surfaces and which has been hot-perforated is cut without cutting. By mounting, two printing sections are formed, a printing sheet is introduced between these printing sections, and a pair of ink supply means moves while narrowing the ink permeable belt, the stencil master, and the printing sheet. Stencil ink is leached through the ink permeable belt and the stencil master to perform simultaneous printing on both sides of the printing paper.

Third, the stencil master is substantially composed of a single film obtained by subjecting a thermoplastic resin film to processing for preventing stick with a thermal head and / or processing for preventing electrostatic charging. The first or second stencil printing method is provided.

Fourth, a printing section is formed by stretching an ink-permeable belt and mounting a stencil master stretched between a feeding section and a pulling section on one surface side of the ink-permeable belt. A stencil printing apparatus having an ink supply means on the opposite surface side of the ink permeable belt, and further having a perforated portion for perforating the thermoplastic resin film to obtain the stencil master; The ink permeable belt does not substantially move, and the ink supply means moves while being in contact with the ink permeable belt so that ink is leached through the ink permeable belt and the stencil master. A stencil printing apparatus is provided.

Fifth, the fourth stencil printing machine is provided, wherein the ink-permeable belt has sections different in number of ink colors, and the ink supply means has the same number of ink colors. You.

Sixth, there is provided the fourth or fifth stencil printing apparatus, wherein the stencil master moves in a direction substantially perpendicular to the feeding direction of the stencil master to be fed.

Seventhly, there is provided the stencil printing apparatus according to any one of the fourth to sixth aspects, wherein the ink-permeable belt is an annular belt which is rotated.

Eighth, there is provided a stencil printing apparatus according to any one of the fourth to sixth aspects, wherein the stencil printing apparatus is a belt-shaped belt around which an ink-permeable belt is wound.

Ninth, a part or all of the ink-permeable belt is made of a sintered metal body.
Eight stencil printing apparatuses are provided.

Tenth, at least the surface of the ink permeable belt which is in contact with the stencil master is made of a fibrous structure having a thickness of 0.5 to 20 μm, and the air permeability of the ink permeable belt in the thickness direction is 3 The stencil printing apparatus according to any one of the fourth to ninth aspects, wherein the stencil printing apparatus has a pressure of 0.02 to 250 cm ³ / cm ² seconds.

Eleventh, the ink-permeable belt has a laminated structure of two or more layers, and the layers can be relatively shifted and moved. Such a stencil printing apparatus is provided.

The features of the stencil printing method and apparatus of the present invention are as follows.
In performing printing, the ink supply means reciprocates relative to the ink-permeable belt. In a known rotary stencil printing, a plate cylinder (corresponding to an ink-permeable belt)
Is a fundamentally different way of performing a rotary motion. That is, when printing the first sheet and printing the second sheet, the ink supply means moves relative to the ink permeable belt and
Return to the print start position of the sheet.

The printing of the second sheet may be performed after the printing of the first sheet. This is a fundamentally different method from that in which the ink supply means moves in one direction relative to the ink-permeable belt when printing. The printing here means continuous printing of at least two or more printing papers, during which the ink supply means reciprocates relative to the ink permeable belt. The relative reciprocating motion may be such that the ink permeable belt stops and the ink permeable belt reciprocates, or both reciprocate while moving together.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to examples. FIG. 1 shows a conceptual diagram of a main part of the first embodiment.
However, the present invention is not limited by this figure and its operation. (Example of Operation) The example shown in FIG. 1 is an example in which the stencil master is configured as shown in FIG.

1. Setting of the thermoplastic resin film The thermoplastic resin film 43 fed from the feed roller 42 moves to the right in the figure between the printing unit 40 and the press unit 41, and is wound around the plate discharging roller 59.
Instead of winding around the plate discharge winding section 59, the unnecessary portion of the thermoplastic resin film may be cut and stored in a plate discharge box (not shown).

2. Perforation and Preparation for Printing The set thermoplastic resin film 43 is perforated by the thermal head 57 while moving to the right in the figure, and is attached to a predetermined position of the printing unit 40. The perforation in the thermoplastic resin film is not limited to the thermal head, but may be performed by a laser. The printing paper 46 is fed out one by one by a feeding roller 55, and the leading end portion comes into contact with the press belt 45 through the guide 54. At least a part of the press belt 45 has a ventilation hole continuous in the thickness direction, and the inside 60 surrounded by the press belt 45 is maintained at a lower air pressure than the outside thereof. While being sucked, it moves to a predetermined position according to the movement and stops. Next, the press unit 41 moves up and comes into contact with the printing unit 40.

3. Printing An ink roller 48 held by a support 53 slidable left and right on a slide bar 52 forms an ink permeable belt 44.
The printing is performed by moving to the left or right in the figure while pressing with appropriate force. In this embodiment, the thermoplastic resin film 4
3 and the ink permeable belt 44 stand still, and the ink roller 48 moves. Conversely, the position of the ink roller 48 stops, and the thermoplastic resin film 43 and the ink permeable belt 4 move.
4 and the printing paper may move. An appropriate amount of the ink 50 is held in an ink reservoir between the ink roller 48 and the doctor rollers 49a and 49b through a pipe (not shown).

4. Discharge / feeding The press unit 41 moves downward in the figure, the press belt 45 rotates clockwise in the figure, and the printed paper is
6 is peeled off from the press belt 45 and fed to the paper discharge tray 58 '. At this time, new printing paper 46 is supplied onto the press belt 45. Printing is repeated for a predetermined number of sheets.

5. Plate discharging and plate making After printing is completed, the perforated thermoplastic resin film 43 (stencil master 43 ′) moves together with the ink permeable sheet 44 and is stored in the plate discharging roller 59. Alternatively, they may be cut and stored without being wound up. At the same time, the next plate making is performed by the thermal head 57 on the newly fed thermoplastic resin film.

Next, the main components will be described. Ink permeable belts include wool, cotton, rayon, vinylon, polyamide, polyester, polyacrylic, polyvinyl chloride, polyvinylidene chloride, fibers made of fluorine resin, etc., carbon fiber, stainless steel, copper,
A single or mixed aggregate of aluminum and other metal fibers, ceramic fibers, glass fibers and other fibrous substances, specifically, a nonwoven fabric, a mesh-like woven fabric, or a sintered body. In the case of metal fibers, ceramic fibers, glass fibers, and the like, a target object having preferable properties can be obtained by sintering. ("Porous Materials-Properties and Applications". Publisher: Gihodo Shuppan Co., Ltd. (1-11-41, Akasaka, Minato-ku, Tokyo. Daiichi Kowa Building) Editor: Renichi Kondo, "Handbook of Porous Materials". Place: IPC Co., Ltd. (Supervision of 1-22-27 Taiyo Building, Hyakunincho, Shinjuku-ku, Tokyo) Atsushi Kanzawa and Masanobu Kaya

If the ink-permeable sheet alone has low rigidity and cannot form a plate cylinder, it is necessary to provide one or more rigid layers inside the plate cylinder. As a specific example, there is a punching metal (a metal plate in which a large number of through holes are punched). The thickness (diameter) of the fiber at least in the vicinity of the surface of the fibrous substance which is in contact with the thermoplastic resin film 43 is preferably 0.5 to 20 μm. Fibrous materials smaller than 0.5 μm in diameter are difficult to manufacture, costly, and have low strength. The diameter of the perforations formed in the thermoplastic film 43 by the thermal head 57 is 10 to 60 μm. Further, a fibrous substance having a diameter larger than 20 mm hinders ink transmission, appears as so-called white spots on an image, and degrades image quality.

An important characteristic of the ink permeable belt 44 is a value of air permeability. It is preferable that the value of the air permeability measured by Permeameter [air permeability tester; product of Toyo Seiki Seisaku-sho] is in the range of 3.0 to 250 cm ³ / cm ² · second. And 3.0cm ³ / cm smaller than ^2-seconds, ink is hardly out, to become blurred image, 250cm ³
If it is larger than / cm ² · sec, the ink will be excessively accumulated and accumulated in a large amount between the stencil master and the ink permeable belt 44, protruding from the side of the stencil master, and adhered to the printing paper excessively, causing image stains and set-off. Becomes

The thickness of the ink permeable belt 44 can take various values depending on the shape, material, hole shape, permeability, structure, etc. of the constituent fibrous substance. The range is 30-3000 μm. If the thickness is less than 30 μm, the strength is low, and if the thickness is more than 3000 μm, a large amount of ink remains, causing a problem in printing immediately after a long pause. Examples of the metal fibers of the ink-permeable belt 44 include a porous sintered body of stainless fibers having a diameter of 3 to 15 μm and a belt shape having a thickness of 100 to 300 μm.

The ink permeable belt 44 can also take the form of a laminate. FIG. 4 is a cross-sectional view of one example. 1
Reference numeral 01 denotes the outside (the side in contact with the thermoplastic resin film), which is a nonwoven fabric having a basis weight of 12 g / m ² and made of 0.2 to 1.5 denier polyester fiber. 102 is made of nylon mesh on the inside, and is bonded with an adhesive to reinforce 101.

FIG. 5 is a cross-sectional view of another example. Non-woven fabrics 101 and 101 ′ made of polyester fibers of 0.2 to 1.5 denier are laminated on both sides of a mesh 103.

The ink permeable belt 44 has a large number of holes 10 continuous in the thickness direction in addition to the aggregate of the fibrous substances.
4 can also be used (FIG. 6). The thickness of the fibers of the pore-forming fibrous substance at least near the surface of the porous belt in contact with the thermoplastic resin film 43 is preferably 0.5 to 20 μm. Also, Permeam
eter (air permeability tester, product of Toyo Seiki Seisaku-sho, Ltd.)
The air permeability value measured at 3.0 to 250 cm ³ / cm ²
-Preferably in the range of seconds. The possible range of the thickness of the porous belt (FIG. 6) is 30 to 3000 μm. If it is less than 30 μm, the strength is low, and if it is more than 3000 μm, a large amount of ink remains, causing problems such as printing immediately after a long pause.

FIG. 2 shows a modification of the first embodiment. Here, the ink-permeable belt 44 is not an annular belt (endless belt), but a sheet-shaped (band-shaped) belt, and is different in that it is stationary.

The press belt 45 places the printing paper 46 thereon and conveys it to a predetermined position, forms a print image on the printing paper by supporting the printing pressure of the ink roller 48, and transfers the printing paper on which printing is completed to a predetermined position. It has a function to transport to the position. The structure of the press belt 45 may have exactly the same structure as the press belt 45 shown in FIG.
Further, preferably, the belt-like sheet having a large number of through-holes continuous in the thickness direction on the entire surface, or a belt-like sheet having a large number of through-holes continuous in the thickness direction at a specific portion may be used.

The space 60 surrounded by the press belt 45
The pressure can be reduced or increased with respect to the atmospheric pressure (the mechanism is not shown). When the pressure is reduced, the printing paper 46 is attracted to the press belt, and when the pressure is increased, the detachment and detachment are performed. The holes serve the function of air circulation at that time. The present invention is not limited by the presence or absence of the above-mentioned holes, and for example, there is an action of adhesion, static electricity and the like when the printing paper is attached to the press belt, and peeling and detaching includes a peeling claw and suction from the outside.

As a material of the press belt 45, a known plastic can be used. For the materials listed above, applicable plastics are available.
("Porous Materials-Properties and Applications". Published by Gihodo Shuppan Co., Ltd. (1-11-41 Akasaka, Minato-ku, Tokyo. Daiichi Kowa Building)) Author: Renichi Kondo, "Handbook of Porous Materials". IPC Co., Ltd. (1-Hyakunincho, Shinjuku-ku, Tokyo)
22-27 Taiyo Building) Supervision. Jun Kanzawa, Masanobu Someya)

A support 47 for supporting the printing pressure of the ink roller 48 as needed is provided inside the press belt 45. The main part of the support body 47 is formed of a plastics plate or a metal plate having a plate shape and partially open.
Or, it comprises a plurality of rotatable rollers.

The thickness of the thermoplastic resin film 43 is 0.5
10 to 10 μm, preferably 1.0 to 3.0 μm. The thermoplastic resin film 43 may be subjected to antistatic processing. Antistatic processing is a method of dispersing or kneading inorganic particles such as carbon or organic antistatic agents (often a surfactant) into a film material, and also protecting the film on the film surface and preventing sticking. There is a method of dispersing or kneading in a coating film to be provided. Surfactants are liquid,
It is useful to lower the electric resistance of the coating film after film formation or to lower the electric resistance by water absorption.

The diameter of the perforations formed in the thermoplastic resin film 43 by the thermal head 57 is suitably from 10 to 60 μm. The stencil master 43 'thus obtained is a known one. As the thermoplastic resin film, it is preferable to use a stretched polyester film having no support and having a thickness of substantially 0.5 to 5 μm.

As shown in FIG. 3, the thermoplastic resin film 43 may include (a) a film made of only a perforable film, and (b) a known support which is generally used. Further, in addition to the above-mentioned layer, the adhesive layer may have a plurality of layers such as an adhesive layer.

FIG. 7 is a conceptual diagram of a main part of the second embodiment (multicolor printing). However, the present invention is not limited by this figure and its operation. The example in FIG. 7 relates to a printing method / apparatus for multicolor printing. In the present invention, in performing printing, the wound thermoplastic resin film 43 is unwound without being cut from a long shape, and is thermally perforated by a thermal head 57 to form a stencil master. Is mounted on an ink-permeable belt 44 (corresponding to a plate cylinder). In printing, the ink permeable belt and the stencil master do not move, and the ink roller 201 serving as the ink supply means moves while being in contact with the ink permeable belt 44, thereby leaching the ink, and the ink is printed through the ink permeable belt 44 and the stencil master. Printing is performed by transferring to paper. Here, the ink permeable belt 44 may be long or endless, but it is mechanically desirable that the belt be endless and have a flat surface. The thermoplastic resin film 43 may be in a form of being folded (rolled) or fed out in a stretched state at the time of thermal perforation in a folded state. The ink supply unit may be a squeeze method such as a "spatula" which does not rotate other than the ink roller.

The printing paper 46 is transferred to the stencil master 4 by the transport unit.
The printing plate is moved to a predetermined position of the printing plate portion facing 3 ', and is pressed against the stencil master to perform printing. The press of the stencil master and the printing paper is performed between the ink supply means (ink roller 201) and the press belt 45. In the case of a rectangular tubular belt, printing is performed on a printing plate portion of a stretched flat surface, and in the case of a cylindrical belt, printing is performed by reciprocating an inner printing roller in a cylindrical printing plate portion. Backup cooperates with printing on rollers.
In the case of monochromatic printing, when printing is completed, the printed paper is separated from the stencil 43 'master while being in close contact with the transport unit by the action of a clamp, suction, or the like, and is separated from the transport unit by a separating claw, a roller, etc., and is stored in a predetermined manner. It is transported to the place (tray 58 '). This is repeated for a predetermined number of prints. In response to the next printing start signal, the stencil master is pulled by the pulling portion and moves while a new thermoplastic resin film 43 is fed out (at this time, the ink permeable belt 44 may or may not move together with the stencil master. Then, the printing end portion is separated from the ink-permeable belt, cut or stored in a long shape, or wound up by a winding roller. At the same time, a new stencil master that has been made is mounted on an ink-permeable belt.

The apparatus shown in FIG. 7 is particularly effective for multicolor printing. In the figure, K is black, C is cyan, M is magenta,
Y is a printing section for each color of yellow. Of course, this device may be used for a single color as described above, or for two colors, three colors or more. Now, the master perforated by the K color signal is mounted on the K color section of the ink permeable belt 44. Press belt 4 on which printing paper 46 rotates
5, the press unit moves upward, and the printing paper comes into contact with the stencil master. An ink roller 201 dedicated to K color is provided with an ink permeable belt 4 perpendicular to the paper surface.
While moving from left to right in the figure while touching 4, the K color ink is transferred to the printing paper. After printing once, the ink roller 201 returns to the original position in a separated state. The printed paper leaves the stencil master while being in close contact with the press belt 45 by the action of suction or the like, and moves to a predetermined tray 58 'by rotation of the press belt 45. When a predetermined number of sheets have been printed, the ink permeable belt rotates counterclockwise together with the K color stencil master while carrying the stencil master, and then the stencil master separates from the ink permeable belt and is cut or rolled. Rolled up.
When the printing of K color is completed, the ink roller 201 of K color returns to the left end and is separated from the ink permeable belt.

Next, the ink permeable belt (C) for printing the C color moves to a predetermined position, and the ink roller 301 dedicated to the C color contacts the ink permeable belt 44. The paper 46 'on which the K color image has been printed moves from the tray 58' to the same position as the previous one on a path reverse to the previous one, and comes into contact with the C color stencil master. At this time, the angle, position, and the like may be moved from the time of storage of the sheet so that the tray 58 'is suitable for carrying out the sheet. The ink roller 301 dedicated to the C color moves in the opposite direction to the above while contacting the ink permeable belt, and the C color ink is transferred to the paper 46 '. The paper on which the colors K and C are printed moves away from the stencil master for color C to a predetermined tray 58. Here, the paper passage paths are reversed between K color and C color, but the user may replace the tray 58 ′ (or the contents) with the tray 58. In that case, the same printing and paper path are always required.

Hereinafter, the same applies to the M color and the Y color. However, the M color ink roller 401 and the Y color ink roller 5
01 can be printed by moving in a direction perpendicular to the feeding direction of the master. For this reason, it is necessary that the ink rollers 401 and 501 have substantially the same length as the length of the printing area in the moving direction of the stencil master. The reason is that it is difficult to install the ink rollers for all four colors so as to move in the feeding direction of the master, and there is a possibility that the printing device may become large and complicated in that direction. This is a design decision of the device. When the ink permeable belt 44 contacts the guide roller 99,
The guide roller 99 becomes dirty and the ink permeable belt 44
Also, the colors of the ink rollers may be mixed. To prevent this, provide a cleaning device,
It is desirable to coat the surface of the guide roller 99 with a material (for example, fluorine resin) to which ink does not easily adhere.

As shown in FIG. 8, the ink roller 201
Are connected at the lower ends of two arms 202, 202 '. The arms 202, 202' are suspended from a cross-shaped stage 601 and can move forward and backward in one direction. . At the upper ends of the arms 202 and 202 ', slide portions 203 and 203' which can be inserted and moved into the rack 602 of the stage 601 are attached. At the lower ends of the arms 202 and 202 ', ink rollers 201 are provided. A fastener (not shown) is provided for locking one end of the. These pairs support both ends of the ink roller 201 and move. The movement of the ink roller 201 is performed by the motor 204 attached to the arm 202, and the gear 20 attached to the arm 202 ′ in contact with the rack 602 of the stage 601.
This is done by rotating 5. In the figure, reference numeral 206 denotes an idler. However, the slide units 203 and 203 'suspended from the stage 601 can be moved by known means. Such an ink roller is C,
Four for each of the colors M, Y, and K are provided.

The ink permeable belt 44 shown in FIG. 7 can be the same as that described with reference to FIGS. 1 to 6, but a preferable example is a porous sintered body of stainless steel having a diameter of 3 to 15 μm. It has a cylindrical shape of 100 to 800 μm. On the other hand, a punched metal having holes of several tens μm to several mm may be used. The belt can also take the form of multiple layers. FIG. 9 is a cross-sectional view of one example. Reference numeral 105 denotes an outer side (side in contact with the stencil master), which is a porous sintered body of stainless fiber having a diameter of 3 to 15 μm and a thickness of 50 to 700 μm.
m. 106 is inside (side in contact with ink roller)
And a cylindrical sintered body of stainless steel fiber having a diameter of 20 to 100 μm and a thickness of 50 to 200 μm.

In the case where the ink permeable belt has two layers as shown in FIG. 9, it is desirable that the two layers can be relatively shifted. The reason is ghost image reduction. That is, the ink permeable belt in the portion corresponding to the image portion of the previous stencil master passed through a larger amount of ink than the ink permeable belt in the portion corresponding to the non-image portion, and the residual ink inside the ink permeable belt remained. This is because the amount of ink is smaller than that in the non-image area, and the next time printing is started, the image density in that area becomes lower, and appears as an image such as an afterimage in the print.

If the stencil master itself has a support, this support can disperse such undesirable effects and reduce the appearance of ghosts. However, the problem of ghost is large in the film single master, and the influence may appear on several prints from the start. However, in the present invention, the stencil master is sandwiched between the ink-permeable belt and the printing paper at the time of printing, they do not basically move during printing, and the stencil master receives only the force in the thickness direction, Therefore, it is possible to print a large number of sheets (in a known rotary transfer printing press, the plate cylinder on which the master is wound is rotating while being in contact with the paper. Troubles such as elongation, wrinkles, and missing plates occur, and this is one of the reasons why a support is required), and a support for maintaining strength is not necessarily required.

The timing for shifting the two-layer belt is at the start of printing, at the end of printing, or during printing. The size of the deviation can be arbitrarily determined, but is generally several millimeters or less.
If it is small, the effect is small, but even if it is large, it cannot overlap with the gamut of another color and there is an upper limit on its own.

FIG. 10 shows an example of a driving mechanism that causes a shift. The driving unit 121 has a double shaft, and the outer shaft 122
Is connected to the large diameter gear 123 and the inner shaft 124 is connected to the small diameter gear 125. The inner shaft 124 has a protrusion 127 that receives the power from the motor. When the double belt is displaced, a pin 126 for fixing the large-diameter gear 123 and the small-diameter gear is used.
And if only the small diameter gear 125 is rotated, the inner belt 106 is displaced. If the color is shifted only in one direction, the color is mixed, so that the rotation is a reciprocating motion. The ink-permeable belt can also be formed of a belt having a large number of continuous holes in the thickness direction in addition to the aggregate of the fibrous substances.

FIG. 11 shows another embodiment of four-color printing.
The plate portion forms a flat surface from which four colors can be obtained. After perforating the thermoplastic resin film 43 for four colors of C, M, Y, and K, each of the ink rollers 201, 301, 401, and 50 is perforated.
1 simultaneously moves from right to left in the figure and prints each color.
After printing, each ink roller returns to the right position, and the printing paper is fed by one surface (one color). The paper on which the four-color printing has been completed is separated from the press belt 45 by the separation claw, and
8 ′, and four-color printing is completed. Repeat this.
Plate discharging is performed for four colors by a take-up roller, and at the same time, punching for four colors for the next printing is performed.

Next, the simultaneous double-sided printing according to the third embodiment will be described. In this example, a roller-shaped or folded thermoplastic resin film is fed out without being cut from a long shape and a perforated master is attached to an ink-permeable belt (corresponding to a plate cylinder) in performing printing, During printing, the ink-permeable belt does not substantially move, and the ink roller, which is an ink supply means, moves while contacting the belt, thereby leaching the ink, and printing by transferring the ink to printing paper, a printing film, or the like. Is performed. Here, the ink-permeable belt may be long or annular.

In FIG. 12, the ink-permeable belt is composed of a pair of elongated members. The ink permeable belt 44 is 44
a and 44b, which can be shifted from each other. The thermoplastic resin film 43 is fed out from the roller state, and an image to be printed on one side is first perforated by the thermal head 57, and an image to be printed on the other side is perforated. The stencil master 43 'moves in the vertical direction in the figure, but may move from the front to the back of the paper or from the back to the front. When the stencil master 43 'is mounted between the ink permeable belts and the printing paper 46 is set between the stencil masters 43', the gap between the ink permeable belts is narrowed, and the ink roller 4 having the ink 50 is reduced.
8, 48 'move from one end to the other end of the double ink permeable belt while pressing each other, and printing is performed on both sides of the paper 46.

FIG. 13 is a diagram showing a state in which double-sided printing is being performed. In this case, the gap between the pair of ink permeable belts 44 may be closed while the stencil master 43 'is mounted, or the pair of ink rollers 4 may be maintained with the gap maintained.
Only the contact portions of the ink rollers 48, 4 '
It may be pushed by 8 'to make contact. Master guide roller 9
5 has moved slightly above (FIG. 12).

The printing paper 46 moves, for example, from the back side to the front side or the opposite direction. The inclination of the paper surface is in accordance with the inclination of the ink-permeable belt, and there is no particular limitation from an angle of 90 degrees to vertical, that is, horizontal, to 0 degrees, that is, horizontal. In the case where the paper is almost horizontal, for example, when the paper moves while being held or when only the leading edge is held and moves at a certain speed or more, if the air flow from the moving direction is used, the paper will contact the ink permeable belt and generate The problem of paper stains due to the ink used can be solved. Also, regardless of the shape of the ink permeable belt, the paper is printed and passed between the opposing surfaces of the ink permeable belt drawn out of the roller shape, and is wound up or folded into a roller shape as it is. Or may be cut into a sheet. In this case, problems related to the conveyance of the paper, problems of adhesion of the paper to the master after printing, and the like can be easily solved as compared with a sheet cut into a sheet.

When printing is completed, the interval between the double ink-permeable belts and the interval between the double stencil masters widen, the printed paper is discharged from between the stencil masters, and the thermoplastic resin film 43 is used for new stencil making. It moves while being wound up. At this time, if at least 44a or 44b of the ink permeable belt 44 is relatively moved, it is helpful to reduce ghost of the currently printed image. Of course, this movement need not be performed. In the above example, printing on both sides is performed by one continuous stencil master fed from the feeding roller.

In the present invention, double-sided printing may be performed by two different stencil masters. in this case,
It is preferable to have two thermal heads corresponding to each master. FIG. 14 is a conceptual diagram of the implementation of this method. The stencil masters 43 ′ and 43 ′ that are fed and pierced from the feed rollers 42 a and 42 b are taken up by a take-up roller 59.
a, 59b. In this figure, the printing paper 46 is unwound from the take-up roller, passes through the guide rollers 97 and 97 'without being cut after printing, and
3 and stored in the paper discharge tray 58 '. In this drawing, the printing paper 46 is long until the printing is completed, but the printing paper 46 may be applied in a sheet form from the beginning. In this case, the printing paper is clamped at the upper end and descends downward from the top of the figure, but before printing, air flow is applied to both sides of the paper to prevent the paper from contacting the stencil masters on both sides and being stained with ink. It is desirable to form

FIG. 15 shows an example in which an endless ink permeable belt is used in place of the ink permeable belt of FIG. FIG. 16 shows an example in which the endless ink permeable belt is U-shaped. FIG. 17 shows that the long ink permeable belt is U-shaped, and the roller of the belt is opened to the left and right and can be moved to a position of 3H, so that the stencil master and the printing paper can be easily processed when jammed. This is an example. The stencil master after printing is cut by the master cutter 98,
It is stored in the master storage box 100.

The stencil printing method and apparatus shown in FIGS. 12 to 17 can perform printing without cutting the stencil master, so that a stencil master having a small stiffness such as a single film can be conveyed. Since the part corresponding to the cylinder and the stencil master do not rotate, the center of gravity shifts, and no mechanical adverse effects occur on the stencil master, resulting in printed matter with less ghosting. Complexity is minimized.

In the present invention, at the time of printing, the master is sandwiched between the ink-permeable belt and the printing paper, they do not basically move during printing, and the stencil master receives mainly the force in the thickness direction. Therefore, printing on a large number of sheets is possible, and a support for maintaining strength is not necessarily required. Further, in the present invention, the ink supply means including the ink roller and the ink permeable belt are replaced with those for other colors, so that the present invention can be effectively applied to multicolor printing.

[0065]

According to the present invention, firstly, since it is not necessary to cut the stencil master one by one and apply and discharge the stencil master as in the prior art, a thin stencil master can be used. ,
A stencil master made of a single thermoplastic resin film can also be handled (conveyed, imprinted, discharged). In addition, complicated plate and plate discharging mechanisms are not required, the weight of the rotating and swinging plate cylinder unit is not heavy, wiring to the thermal head is not difficult, and paper dust is not mixed. In addition, the amount of movement of avoiding the press belt pressed against the thermoplastic resin film can be smaller than before (the machine can be downsized). Second
In addition, a printing method and apparatus applicable to multi-color printing are provided. Thirdly, there is provided an apparatus capable of simultaneous double-sided printing which minimizes the size of the printing press, the generation of noise, and the complexity of the apparatus.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a main part of a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a main part of a modification of the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a layer structure of a thermoplastic resin film used in the present invention, wherein (a) a thermoplastic resin is composed of only a film, and (b) is a thermoplastic resin film and a porous material. Of a laminate with the support of the above.

FIG. 4 is a schematic sectional view showing an example of a layer configuration of an ink-permeable sheet used in the present invention.

FIG. 5 is a schematic sectional view showing another example of the layer configuration of the ink-permeable sheet used in the present invention.

FIG. 6 is a schematic sectional view showing another example of the layer configuration of the ink-permeable sheet used in the present invention.

FIG. 7 is a conceptual diagram of a main part of a second embodiment of the present invention.

8A and 8B are diagrams for explaining the movement of each color ink roller for performing four-color printing in FIG. 7, wherein FIG. 8A illustrates the structure of a stage, and FIG. FIG. 3C is a diagram illustrating an upper part of the arm, and FIG. 3C is a diagram illustrating a state in which the arm slides on the stage.

FIG. 9 is a schematic sectional view showing another example of the layer configuration of the ink-permeable sheet used in the present invention.

FIG. 10A is a side view of an example of a shift driving mechanism.
(B) is a sectional view thereof.

FIG. 11 is a schematic diagram of a main part of a modification of the second embodiment of the present invention.

FIG. 12 is a conceptual diagram of a main part of a third embodiment of the present invention.

FIG. 13 is a conceptual diagram of a main part of a third modified example of the present invention.

FIG. 14 is a conceptual diagram of a main part of a third modified example of the present invention.

FIG. 15 is a conceptual diagram of a main part of a third modified example of the present invention.

FIG. 16 is a conceptual diagram of a main part of a third modified example of the present invention.

FIG. 17 is a conceptual diagram of a main part of a third modified example of the present invention.

FIG. 18 is a schematic explanatory view of a conventional stencil printing machine.

FIG. 19 is a schematic side sectional view of a stencil printing machine described in JP-A-2-73987.

FIG. 20 is a schematic side sectional view of a stencil printing machine described in JP-A-6-247024.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate cylinder unit 4 shaft 8 plate cylinder 9 ink-permeable peripheral wall 10 ink supply unit 20 plate supply / discharge unit 21 stencil master 22 master supply unit 23 pteran roller 24 plate discharge winding unit 30 thermal head unit 31 thermal head 31 ′ Advance position 40 Printing unit 41 Press unit 42 Feeding roller 43 Thermoplastic resin film 43 'Stencil master 44 Ink permeable sheet 45 Press belt 46 Printing paper 46' Printed paper 47 Support 48 Ink roller 49a Doctor roller 49b Doctor roller 50 Ink 51 Inking portion 52 Slide bar 53 Support 54 Guide 55 Feeding roller 56 Claw 57 Thermal head 57 'Retreat position of thermal head 58 Paper feed tray 58' Paper discharge tray 59 Plate roller 60 space 70 stencil master 71 master supply unit 72 plate making unit 72a platen roller 72b thermal head 73 cutter mechanism 74 transport mechanism 75 printing unit 76 plate cylinder 76a peripheral wall of plate cylinder 77 plate discharge unit 78 printing paper 80 plate cylinder unit 80a plate Circumferential wall portion 80b Plate cylinder part (ink permeability) 80c Rotating side plate 80d Plate cylinder 81 Plate supply / discharge unit 82 Stencil master 83 Master supply unit 84 Platen roller 85 Thermal head 86 Plate discharge take-up unit 87 Ink supply unit 90 Printing unit 91 Press roller 92 Platen roller 93a Roller 93b Roller 94 Plate cylinder 95 Master guide roller 96 Paper roller 97 Guide roller 97 'Guide roller 98 Master cutter 99 Guide roller 100 Master storage box 101 Sheet outer layer 10 'Outer layer of sheet 102 inner layer of sheet 103 intermediate layer of sheet 104 many holes in sheet 105 outer layer of belt 106 inner layer of belt 121 drive unit 122 outer shaft 123 large gear 124 inner shaft 125 small gear 126 pin 127 Projection part 201 K color ink roller 202 Arm part 203 Slide part 203 ′ Slide part 204 Motor 205 Idler 206 Gear 301 C color ink roller 302 Arm part 401 M color ink roller 402 Arm part 501 Y color ink roller 502 Arm part 601 Stage 602 stage rack

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Kobayashi 1 Tomeihoku Ricoh, 3 Shinmei-do, Nakaname Ichiba, Shibata-cho, Shibata-gun, Miyagi Prefecture

Claims (11)

[Claims] An ink permeable belt is stretched, and a stencil master stretched between a feeding section and a pulling section is mounted on one surface side of the ink permeable belt to form a printing section. Addressing the printing paper to the stencil master and moving the ink supply means while making contact with the ink permeable belt, thereby leaching ink through the ink permeable belt and the stencil master to perform printing on the printing paper; A stencil printing method characterized by the above-mentioned. 2. An ink permeable stencil master, which is stretched so that opposite surfaces have an ink permeable belt, and is mounted on any of the opposite surfaces without cutting, the stencil master being fed out of a long state and subjected to hot perforation. Forming two printing sections, introducing printing paper between these printing sections, and causing a pair of ink supply means to move while narrowing the ink permeable belt, the stencil master, and the printing paper. A stencil sheet is leached through the ink permeable belt and the stencil master to perform simultaneous printing on both sides of the printing paper. 3. The stencil master is substantially made of a single film of a thermoplastic resin film, which is processed to prevent sticking with a thermal head and / or processed to prevent electrostatic charging. 3. The stencil printing method according to 1 or 2. 4. A printing section is formed by stretching an ink-permeable belt and mounting a stencil master stretched between a feeding section and a pulling section on one surface side of the ink-permeable belt. A stencil printing apparatus having an ink supply means on the opposite side of the ink permeable belt, and further having a perforated portion for perforating the thermoplastic resin film to obtain the stencil master. A stencil plate characterized in that the ink permeable belt does not substantially move, and the ink supply means moves while contacting the ink permeable belt, thereby leaching ink through the ink permeable belt and the stencil master. Printing device. 5. The stencil printing machine according to claim 4, wherein the ink permeable belt has sections different in number of ink colors, and the ink supply means has the same number of ink colors. 6. The stencil printing apparatus according to claim 4, wherein the ink supply means is capable of moving in a direction substantially perpendicular to the feeding direction of the stencil master. 7. The stencil printing apparatus according to claim 4, wherein the ink permeable belt is an annular belt that is rotated. 8. The stencil printing device according to claim 4, wherein the stencil printing device is a belt-shaped belt around which an ink-permeable belt is wound. 9. The stencil printing apparatus according to claim 4, wherein a part or all of the ink-permeable belt is made of a sintered body of metal. 10. The ink permeable belt has at least a surface in contact with the stencil master made of a fibrous structure having a thickness of 0.5 to 20 μm, and the ink permeable belt has an air permeability in the thickness direction of 3.0. stencil printing apparatus according to any one of claims 4-9, characterized in that the ~250cm ³ / cm ² sec. 11. The ink permeable belt according to claim 4, wherein the ink permeable belt has a laminated structure of two or more layers, and the layers can move relatively shifted. Stencil printing equipment.