JP3210806B2 - Master clamp device for stencil printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master clamping device for a stencil printing machine.

[0002]

2. Description of the Related Art A master for heat-sensitive stencil printing used in a stencil printing machine includes a very thin thermoplastic resin film such as polyester (hereinafter simply referred to as "film") and a porous flexible support. It has a laminated structure in which synthetic fibers such as polyethylene terephthalate resin (PET) and the like, which are excellent in insulation and heat resistance, and Japanese paper, or a mixture of Japanese paper and synthetic fibers are laminated. The stencil printing machine performs perforating and stencil making on the film portion of the stencil using a heating element such as a thermal head. The printing paper is continuously pressed against the master by a pressing means such as a press roller, and an opening provided in the plate cylinder and a perforated portion of the master are further pressed by an ink supply member arranged inside the plate cylinder. Printing is performed by exuding the printing ink supplied to the inner peripheral surface of the cylinder.

[0003] The master used in the above-mentioned applications uses Japanese paper or the like as a support, so that the passage of the ink is hindered at the portion where the Japanese paper fibers are entangled, and the ink does not transfer to the printing paper. There is a problem that a fiber pattern appears or fine lines are blurred. Therefore, it is possible to prevent the occurrence of fibrous grains by performing printing using a master consisting of only a film without using Japanese paper or the like serving as a support, but the thickness of the film itself is about 1 to 1. About 2 μm, about 20 to about 40 to 50 μm in thickness of the Japanese paper laminate master.
It is extremely thin, about one-half, and the film material itself is a high insulator, and is easily susceptible to static electricity.
There is a problem that the clamping property of the tip of the master decreases.

Conventionally, there is no full-scale technique for solving the above-mentioned problems, but as disclosed in Japanese Utility Model Publication No. 1-26463, for example, a clamper (clamp piece) is used.
And a stage portion which sandwiches and joins a headless print master having no reinforcing paper piece portion is selectively magnetically attracted, and the clamper (clamp piece) and the stage portion are magnetically attracted by the magnetic attraction force. A method has been proposed in which a printing master is interposed between the printing masters and the printing master is locked to the printing plate cylinder.

[0005]

However, in the prior art, when the master has a strong stiffness, when the master is clamped by the clamper, even if the master is conveyed in a slightly wavy state, the clamper is lowered. When the sheet is stretched or wound around a plate cylinder, the slack is gradually relaxed and absorbed, thereby preventing wrinkles and the like. However, when the stiffness of the master is weak, such as a master consisting of only a film, the strength on both sides is lower than that in the center of the master. When the both ends hang down, it is delayed as compared with the central portion, so that it is not clamped flat when it is clamped, and there is a problem that vertical wrinkles and horizontal wrinkles occur at the time of winding.

Also, in the clamper of the elastic member described in Japanese Utility Model Publication No. 1-26463, which is pivotally supported on the left and right sides, the center portion is bent so as to be curved downward toward the stage side by a magnetic force. When the master is clamped by the clamper (when the master is rotated in the closing direction), the master comes into contact with the stage from the center. As described above, when the clamper rotates and comes into contact with the stage from the center thereof, the center of the ear of the master is clamped while being moved toward the pivot side by the inner end of the clamper. Therefore, only the central portion of the master is extended in the moving direction, so that a clamp wrinkle is easily generated.

In some cases, the porous support of the master is made thinner in order to improve or improve the image quality by reducing or preventing the graininess. However, even in this case, the strength and stiffness of the master itself are weak, and undulations and the like occur. This easily causes the clamp to become unstable, causing a problem that wrinkles occur in the master. Accordingly, the present invention provides a master in which a conventional porous support and a film adopt a laminated structure,
It is an object of the present invention to provide a master clamp device capable of suppressing generation of wrinkles even when a master having a thin porous support or using no porous support is used.

[0008]

A stage extending along one generatrix of an outer peripheral surface of the porous cylindrical plate cylinder according to claim 1, and a stage extending on the outer peripheral surface of the plate cylinder in parallel with the stage. The provided support shaft, both ends are supported by the support shaft, and selectively occupy a suction position magnetically attracted to the stage and a separation position separated from the stage. In a master clamp device of a stencil printing device including a clamper for holding a plate-making master between the stage and the stage, when the clamper occupies the separated position, the central portion has a shape curved in a direction away from the stage. The magnet is formed at least at the central portion or at a stage portion facing the central portion. 3. A stage extending along one generatrix on the outer peripheral surface of the porous cylindrical plate cylinder according to claim 2, a support shaft provided on the outer peripheral surface of the plate cylinder in parallel with the stage, and The center part is supported by a shaft, and selectively occupies a suction position magnetically attracted to the stage and a separation position separated from the stage. When the suction position is occupied, a plate-making master is placed between the stage and the stage. In the master clamp device of a stencil printing apparatus including a clamper to be clamped, the clamper is formed of a substantially band-shaped elastic body whose suction surface has a planar shape when occupying the separated position, and both ends thereof are formed. A magnet is arranged at least at both ends or at a part of the stage facing the both ends, the magnet being arranged to be displaceable toward the stage.

[0009]

According to the first aspect of the present invention, the clamper, which selectively rotates between a suction position magnetically attracted to the stage and a separated position separated from the stage, has a central position when the separated position is occupied. The part is formed from a substantially band-shaped elastic body that has a curved shape away from the stage, and the magnet is arranged at least in the center part or the stage part facing the center part, so that the clamper moves from the separated position to the adsorption position. When it turns toward the stage, both ends contact the master on the stage first, and then the curved central portion is magnetically attracted to the stage side and approaches and displaces toward the stage. Due to the displacement of the central portion, both ends move in the extending direction of the stage parallel to the support shaft, and tension is applied to the master held between the clamper and the stage in the extending direction of the stage. According to the second aspect of the present invention, the clamper selectively rotating between a suction position magnetically attracted to the stage and a separated position separated from the stage has a flat suction surface when the separated position is occupied. The clamper is formed of a substantially band-shaped elastic body having a shape, both ends of which can be displaced toward the stage, and magnets are arranged at least at both ends or at a stage portion facing the both ends, so that the clamper is at a separated position. , The both ends are magnetically displaced to the stage side parallel to the support shaft during the rotation process and contact the master on the stage before the center, and the master rotates the clamper. It is drawn to the center side. When both ends of the clamper come into contact with the master on the stage, the center part supported by the support shaft is pushed to the stage side by the rotation of the clamper and displaced, and both ends move in the direction of extension of the stage. Then, tension is applied to the master in the direction in which the stage extends.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a stencil printing machine according to a first embodiment of the present invention will be described. The stencil printing machine denoted by reference numeral 200 in FIG. 1 has a porous cylindrical plate cylinder 1. The plate cylinder 1 has a configuration including a porous support cylinder and a mesh screen of a resin or metal net wound around the surface thereof. The plate cylinder 1 is rotatably supported by a rotation center shaft 5 also serving as an ink pipe, and is rotationally driven in the direction of arrow A by a motor (not shown). An ink roller 2 rotatably supported by a side plate (not shown) is arranged inside the plate cylinder 1.

The ink roller 2 is rotatable in the same direction as the plate cylinder 1 by a drive transmission means including gears, belts and the like (not shown). In the vicinity of the ink roller 2, a doctor roller 3 is disposed at a slight distance from the outer peripheral surface 2A. In a wedge-shaped space formed by the ink roller 2 and the doctor roller 3, an ink reservoir 4 to which printing ink is supplied from an ink pipe (5) is formed. It is supplied to the surface 2A and is supplied to the plate cylinder inner peripheral surface 1B. Near the outer peripheral surface 1A of the plate cylinder 1 facing the ink roller 2, a contact position indicated by a solid line with respect to the plate cylinder 1 pressing the printing paper S against the plate cylinder 1 and a separation position indicated by a two-dot chain line are shown. A press roller 17 that is oscillated by oscillating means (not shown) is provided.

On the left side of the plate cylinder 1, a master roll 8A around which a master 8 (hereinafter simply referred to as "master 8") substantially consisting only of a thermoplastic resin film is rotated by holder means (not shown). Roll core 8B freely supported
It is supported by. The master 8 is pressed against a platen roller 9 rotatably supported by a side plate (not shown) by a thermal head 10 having a heating element. The master 8 is fed from the master roll 8A in the direction of arrow B by the rotation of the platen roller 9, and It is directed to the plate cylinder 1. The master 8 is perforated while passing between the platen roller 9 and the thermal head 10 to form a perforated image. Between the platen roller 9 and the plate cylinder 1 located on the downstream side in the master transport direction, there are provided feed rollers 11A and 11B which are rotatable in a state where they are pressed against each other, and a fixed blade 12a which cuts the master 8 into an appropriate length. And a movable blade 12b, and a tip 8a of the master 8 is connected to the stage 6 and the clamper 7.
And a guide plate 13 that guides between them. The plate making means is composed mainly of the platen roller 9, the thermal head 10, the feed rollers 11A and 11B, and the cutter device 12. The feed rollers 11A, 11A
B is rotated slightly faster in peripheral speed than the peripheral speed of the platen roller 9 to prevent the master 8 from becoming loose between the feed rollers 11A and 11B and the platen roller 9.

The master clamping device 100 includes a stage 6 provided on the outer peripheral surface 1A of the plate cylinder 1, and a clamper 7 for holding the tip 8a of the master 8 conveyed in combination with the stage 6. The stage 6 is formed of a magnetic material and, as shown in FIG.
Are provided along one bus bar. Supporting shafts 14A and 14B parallel to the stage 6 are rotatably and slidably supported by hinges 6a and 6b formed at both ends of the stage 6, respectively. FIG. 4 shows the support shafts 14A and 14B.
As shown in FIG. 7, a clamper 7 is supported between the hinges 6a and 6b with an interval L therebetween. Each interval L is
The displacements Δa of both ends 7a and 7b of the clamper 7, which will be described later, are set to be larger than each.

The clamper 7 is fixed to a supporting shaft 14A and a supporting shaft 14B to each of which a gear 15 for connecting both ends 7a and 7b to an opening / closing device (not shown) is fixed. It can be freely opened and closed between a contacting suction position and a separating position separated from the stage 6. As shown in FIGS. 3 and 4, the clamper 7 has a substantially band-like planar shape, and is formed into a shape in which, when occupying the separated position, the central portion 7 c is curved away from the stage 6. 7a and 7b are flat surfaces continuous with the curvature of the central portion 7c. When the suction portion is occupied, the central portion 7c is deformed toward the stage 6 and comes into close contact with the stage 6, and both ends 7a and 7b are Each moves in the axial direction. A coil spring 16 is provided between both ends 7a, 7b and hinges 6a, 6b.
a and 16b are wound around the support shafts 14A and 14B, and the clamper 7 is biased from both sides toward the center by the spring force of the coil springs 16a and 16b.

More specifically, the clamper 7 bends the center of the thin elastic supporting plate 7A and makes the both ends flat surfaces, and the surface of the bending portion facing the stage 6 follows the bending portion. And a magnetic member 7C having a higher frictional resistance than the upper surface of the stage 6, for example, a rubber magnet is provided on the surfaces of both ends 7a and 7b facing the stage 6. Support plate 7
A may be any material having elasticity, and in this embodiment,
A thin metal plate of about 0.5 to 1 mm is used. Other suitable materials for the support plate 7A include a thickness of 0.5 to
Plastics such as vinyl chloride having a size of about 1 mm are exemplified. The curvature of the central portion 7c of the clamper 7 is set such that the distance Δd from the bottom end surface 7D forming a part of the suction surface to the maximum curved portion 7E on the inner curved surface of the rubber magnet 7B is in a curvature range of about 2 mm to 5 mm. Is set.

The operation of the stencil printing apparatus 200 and the master clamp apparatus 100 having the above configurations will be described. In the stencil printing apparatus 200, when a document is set on a document reading unit (not shown) and the start button is pressed, the plate cylinder 1 is rotated, and the used old plate is rotated by the plate discharging device (not shown).
Is peeled off from the outer peripheral surface 1A and is discarded. Next, plate cylinder 1
Is rotated to move the master clamp device 100 to a position substantially above the plate cylinder 1 which is a predetermined plate feeding position, and stops, and the clamper 7 is opened to be in a plate feeding standby state. When the original is sent to an original reading unit (not shown), the read original image is converted into electrical image information by a CCD (not shown), A / D converter, plate making controller, and the like. The heating element generates heat, and the platen roller 9 and the feed rollers 11A, 11A
B is rotated by a stepping motor (not shown) to make the master 8 while transporting the master 8. The leading end 8a of the master 8 that has been made is guided by the guide plate 13 to the master clamping device 100.

When it is determined, for example, by the number of steps of a stepping motor (not shown) that the tip 8a of the master 8 has reached between the stage 6 and the clamper 7 constituting the master clamp device 100, the opening / closing mechanism (not shown) operates. The clamper 7 rotates toward the suction position, the front end 8a of the master 8 is pinched, and the plate cylinder 1 is re-driven clockwise at substantially the same speed as the transfer speed of the master 8, so that the master 8 that has been made is pressed. It starts to be wound on the outer peripheral surface 1A of the body 1. When it is determined by the number of steps of the stepping motor that the master 8 made on the plate cylinder 1 is wound by a predetermined length, the rotation of the plate cylinder 1, the platen roller 9, and the feed rollers 11A and 11B is stopped, and the cutter device is stopped. 12, the master 8 is cut off, and thereafter the plate cylinder 1 rotates clockwise again,
The cut master 8 is completely wound around the outer peripheral surface 1A of the plate cylinder 1.

When the winding of the master 8 around the plate cylinder 1 is completed,
One sheet of printing paper S is inserted between the plate cylinder 1 and the press roller 17 at a predetermined timing synchronized with the rotation of the plate cylinder 1 by a sheet feeding device (not shown). Then, the outer peripheral surface 1 of the plate cylinder 1
The press roller 17 that has been separated from A is swung upward, and the printing paper S is pressed by the master 8 that has been made on the outer peripheral surface 1A of the plate cylinder 1 that rotates in the clockwise direction, and the plate is made. The ink is transferred from the perforated portion of the master 8 to the surface of the printing paper S and printed. At this time, the ink roller 2 also rotates in the same direction as the rotation direction of the plate cylinder 1, and supplies the printing ink to the inner peripheral surface 1B of the plate cylinder 1. The printed printing paper S is applied to the outer peripheral surface 1 of the plate cylinder 1 by a peeling nail (not shown).
A, and is discharged to a discharge tray (not shown) arranged to the left of the press roller
Swings to the separated position and enters a printing standby state.

(Operation of Master Clamping Apparatus 100) The leading end 8a of the master 8 that has been made is placed in the master clamping apparatus 100.
When it reaches between the stage 6 and the damper 7, the opening and closing mechanism (not shown) rotates the damper 7 toward the suction position, and as shown in FIG. 5 (a), both ends 7a and 7b.
The lower surface of the magnetic member 7C provided at both ends 8b of the master 8
8c, the rubber magnet 7B provided in the central portion 7c so as to be curved so as to protrude away from the stage 6 faces downward in the drawing in order to attract the stage 6 made of a magnetic material by its own magnetic force. Displace. Central part 7c
5B, both ends 7a and 7b of the clamper 7 move by Δa in the extending direction of the stage 6 indicated by arrows (see FIG. 3), as shown in FIG.
b, 8c hang down to form a semi-cylindrical shape (an inverted U-shape) and are conveyed onto the stage 6 at both end edges 8b, 8 of the master 8
A tension is applied to c in the direction of the arrow, and the leading end 8a of the master 8 having been made is clamped between the stage 6 and the clamper 7 while the wrinkles in the width direction of the master 8 are extended.

As described above, according to the first embodiment, both ends 7a and 7b of the curved-formed clamper 7 are brought into contact with the master 8 on the stage 6 first at the time of closing the clamper of the master 8 which has been made. Since the clamper 7 itself is elastically deformed while the entire clamper 7 is pressed against the stage 6, the positions of both end portions 7a and 7b of the clamper 7 move in the extending direction of the stage 6, respectively, so that the plate-making is completed. The master 8 can be clamped while applying a tension to both ends 8 b and 8 c of the master 8 in a direction in which the stage 6 extends. Therefore,
The master 8 that has been prepressed is placed on both edges 8 of the master 8 during transport.
Even if b and 8c hang down and are conveyed in a semi-cylindrical shape as described above, they are corrected during the clamping operation.
The generation of wrinkles and the like during winding on the plate cylinder 1 is prevented.

Next, a second embodiment of the present invention will be described. Members having the same structure and the same function as those of the first embodiment are denoted by the same reference numerals as those used in the first embodiment. Description is omitted. In the second embodiment, as shown in FIGS. 6 and 7, a central portion 70c of a clamper 70 is fixed to one support shaft 140 rotatably supported by hinges 6a and 6b, and the clamper 70 is moved to a separated position. The entire bottom surface 70D of the clamper 70 constituting the suction surface when occupied is formed of a substantially band-shaped elastic body having a planar shape, and both end portions 70a, 7a thereof.
It is characterized in that Ob is constituted by a magnet and can be displaced toward the stage 6.

The clamper 70 is a flat, plate-like rubber magnet 70B having a greater frictional resistance than the upper surface of the stage 6 on both ends 70a, 70b of a thin, band-like elastically deformable support plate 70A.
And the rubber magnets 7 at both ends 70a and 70b
0B and the magnetic member 70C
Are arranged in a double structure. Normally, when the clamper 7 is at a separated position away from the stage 6, the bottom surface 70 </ b> D serving as a suction surface thereof has a planar shape due to the tension of the support plate 70 </ b> A, and is rotated near the suction position. Then, both ends 70a, 70b are deformed in a C-shape in front view toward the stage 6 by the attracting action of the rubber magnets 70B provided on both ends 70a, 70b. The amount of movement of the clamper 70 in the axial direction due to the deformation of the both ends 70a, 70b is Δ
b. The clamper 70 has both ends 70a, 70b.
Is set so that the distance between the stage 6 and the bottom surface 70D when Δ is displaced is Δd ′. Here, Δd ′ is approximately 2 mm to 5 mm.

According to the master clamp device 100 'having the clamper 70 having such a configuration, when the leading end 8a of the master 8 having been made reaches between the stage 6 and the clamper 70 which constitute the master clamp device 100', it is shown in FIG. It is rotated toward the stage from the separated position shown in FIG. When approaching the vicinity of the stage 6, first, as shown in FIG.
70b is deformed toward the stage 6 by the attracting action of the rubber magnet 70B due to the magnetic force, and comes into contact with both end edges 8b, 8c of the tip 8a of the master 8 on the stage 6 before the center portion 70c. Then, the clamper 70 approaches the stage 6 while rotating, and as shown in FIG.
The inner ends 70d of the both ends 70a, 70b are in contact with the both edges 8b, 8c of the front end 8a of the master 8 by Δc before the position when the inner end 70d is at the suction position shown by the two-dot chain line, and the clamper 70 is in the suction position. , The leading end 8a of the master 8 is drawn into the support shaft 140, which corresponds to the center of rotation. Therefore, the wrinkles generated in the longitudinal direction of the master 8 are elongated at the time of clamping.

When the clamper 70 further rotates in the closing direction, the central portion 70c fixed to the support shaft 140 is pressed, and the bottom surface 70D is displaced downward as shown in FIG. Then, both ends 70a and 70b move toward the extending direction of the stage 6 indicated by the arrow by Δb. Therefore, the both ends 8b and 8c of the master 8 which is curved and enters between the clamper 70 and the
Can be clamped while applying a tension to move the master 8 in the extending direction, so that the curvature of the master 8 is corrected during the operation of the clamper, and wrinkles and the like when the plate cylinder 1 is wound around are eliminated.
In this embodiment, the V-groove L1 is provided between the magnetic member 70C and the rubber magnet 70B.
Formed of extremely thin steel or synthetic resin, or
The groove L1 is not always necessary when a rubber magnet 70B having a strong magnetic force is used to easily deform both ends 70a and 70b of the clamper 70 toward the stage 6.

In each of the above embodiments, the rubber magnets 7B and 70B are arranged as the attraction members on the side of the clampers 7 and 70, however, the present invention is not limited to this. In the first embodiment, the curved shape of the clamper 7 is used. Central part 7c and both ends 7
a, 7b, a magnetic body is arranged, and a central portion 7c and both end portions 7c are provided.
The magnets are arranged on the stage 6 facing the a and 7b, and also in the second embodiment, both end portions 70a and 7a of the clamper 70 are provided.
0b and a central portion 70c are provided with a magnetic material.
The magnet may be arranged on the stage 6 facing the center 70b and the central portion 70c, and the clampers 7 and 70 may be deformed and brought into close contact with the stage 6, so that the tip 8a of the conveyed master 8 may be clamped. Good. Even with such a configuration, the same effects as those of the above embodiments can be obtained. In each of the above embodiments, the support shafts 14A, 14B or the support shaft 140 are provided rotatably with respect to the stage. However, the present invention is not limited to this.
B, 140 are fixed to the stage 6, and the spindles 14A,
One end of the clamper 7 or 70 is rotatably provided on the shaft 14B or the support shaft 140, and the clamper 7 or 70 is opened and closed by opening / closing means having an arm or the like which selectively engages with the clamper 7 or 70. May be.

Further, in the first embodiment, the magnetic members 7C are arranged at both ends 7a and 7b of the clamper 7, and in the second embodiment, the magnetic members 70C are arranged at the center 70c of the clamper 70, respectively. The magnetic members 7C and 70C may be metal or resin, or may be magnets similar to the central portion 7c and both end portions 70a and 70b.
Further, a non-magnetic member may be used instead of the magnetic members 7C and 70C. However, in order to ensure the effect of smoothing the wrinkles of the master 8, both ends 7a, 7a of the clampers 7, 70 are required.
It is preferable to arrange magnets in all of b, 70a, 70b and central portions 7c, 70c. In addition, the master 8 substantially consisting of only the thermoplastic resin film used in each of the above-described examples refers to the master 8 consisting of only the thermoplastic resin film, and a trace component such as an antistatic agent added to the thermoplastic resin film. In addition, those containing one or more thin film layers such as overcoat layers formed on both main surfaces of the thermoplastic resin film, that is, at least one of the front surface and the back surface, are included. The master 8 may have a laminated structure in which a porous support and a film are attached to each other.

[0027]

According to the first aspect of the present invention, the center of the clamper is bent away from the stage so that both ends of the clamper come into contact with both ends of the master when the master is clamped, and the center of the clamper is attracted by magnetic force. By deforming the part toward the stage and moving both ends in the stage extending direction, it is possible to prevent wrinkles from occurring when the clamper is clamped.
In other words, even when a master having a semi-cylindrical shape with its both edges hanging down during conveyance can be corrected during clamping, it is possible to provide a master clamping device that is less likely to be wrinkled during winding of the plate cylinder and that can be securely locked. . According to the second aspect of the present invention, both ends of the clamper whose center is supported by the support shaft are deformed by magnetic force toward the stage near the stage and are formed on both ends of the master on the stage before the center. By contacting, both ends of the master can be provided with tension in a direction of pulling outward from the stage, and as the clamper rotates, the master can be pulled toward the center of rotation of the clamper. Even if a master with a double-sided edge that hangs down and is conveyed can be straightened during clamping, it can be straightened at the time of clamping, hardly wrinkles when wrapping the plate cylinder, it can be securely locked, and the wrinkles formed in the master conveyance direction can be extended. And a master clamping device capable of performing the same.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a stencil printing apparatus employing an embodiment of the present invention.

FIG. 2 is a perspective view showing a master clamp device of the stencil printing apparatus as the first embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a part of the clamper in the first embodiment.

FIG. 4 is a partially cutaway plan view of the clamper in the first embodiment.

FIG. 5A is a sectional view showing an initial contact state between the clamper and the master in the first embodiment, and FIG. 5B is an operation diagram showing a deformed state of the clamper.

FIG. 6 is a plan view showing a second embodiment of the present invention.

FIG. 7 is a partially broken enlarged perspective view of a clamper according to a second embodiment.

FIG. 8 is a side view showing the operation of the master clamp device according to the second embodiment.

9A is a front view of a clamper placed at a separated position in the second embodiment, FIG. 9B is a cross-sectional view showing an initial contact state between the clamper and the master, and a deformed state of the clamper;
(C) is a sectional view showing a deformed state of the clamper.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 1A outer peripheral surface 6 stage 7, 70 clamper 7a, 7b, 70a, 70b both end portions 7c, 70c central portion 7B, 70B magnet 8 master 14a, 14b, 140 spindle 100, 100 'master clamp device 200 stencil printing device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41L 13/10 B41L 13/14 B41F 27/12

Claims (2)

(57) [Claims] 1. A stage extending along one generatrix of an outer peripheral surface of a porous cylindrical plate cylinder; a spindle provided on the outer peripheral surface of the plate cylinder in parallel with the stage; Both ends are supported by a shaft, and selectively occupy a suction position magnetically attracted to the stage and a separation position separated from the stage. A master clamp device of a stencil printing device including a clamper to be clamped, wherein the clamper is formed of a substantially band-shaped elastic body having a shape in which a central portion thereof is curved away from the stage when occupying the separated position. A master clamp device for a stencil printing machine, wherein a magnet is provided at least at the central portion or at a stage portion facing the central portion. 2. A stage extending along one generatrix of an outer peripheral surface of a porous cylindrical plate cylinder; a spindle provided on the outer peripheral surface of the plate cylinder in parallel with the stage; The center part is supported by a shaft, and selectively occupies a suction position magnetically attracted to the stage and a separation position separated from the stage. When the suction position is occupied, a plate-making master is placed between the stage and the stage. A master clamp device of a stencil printing device including a clamper to be clamped, wherein the clamper is formed of a substantially band-shaped elastic body whose suction surface forms a planar shape when occupying the separated position, and both ends thereof. A master portion of the stencil printing machine, wherein a portion is displaceable toward the stage, and a magnet is provided at least at both ends or at a portion of the stage facing the both ends.