JP2001219637A - Stencil printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printing device securing a linearity in the axial direction of a plate cylinder or an impression cylinder for a plurality of paper separating members without increasing a cost and capable of effecting excellent paper separation at all times. SOLUTION: In the stencil printing device 1 having a plate cylinder 20, around whose outer peripheral surface a master 22 is wound, and a plurality of paper separating members 46 provided wit tip end units for separating the printing paper P from the outer peripheral surface of the plate cylinder 29, gaps G between the outer peripheral surface of the plate cylinder 29 and respective tip end units of the plurality of paper separating members 46 are permitted to be adjusted respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly to a sheet separating mechanism for separating a printing sheet from an outer peripheral surface of a plate cylinder or an impression cylinder.

[0002]

2. Description of the Related Art A rotatable plate cylinder, which is a porous support cylinder, and a master having a laminate structure are used. The master is heated and perforated by a thermal head, and then the plate is wound around the plate cylinder and provided inside the plate cylinder. While the ink is supplied from the ink supply means, the printing paper is continuously pressed by the pressing means such as a press roller or an impression cylinder against the plate-making master on the outer peripheral surface of the plate cylinder, and the ink is supplied from the plate cylinder opening and the master perforated part. BACKGROUND ART A thermal digital stencil printing apparatus that obtains a desired printed matter by extruding and transferring the printing paper from the outer peripheral surface of the plate cylinder after extruding and transferring the printing paper to the outside of the machine is generally known.

[0003] In a stencil printing machine using a press roller as a pressing means, a sheet separating member is used to peel off printing paper stuck to the master on the outer peripheral surface of the plate cylinder by the adhesive force of ink supplied from the inside of the plate cylinder. Is used. The paper separating member is generally made of resin and has a width of about 20 mm, and generally has a sharply pointed tip portion. A plurality of such paper separating members are arranged linearly in the axial direction of the plate cylinder, Each leading end is inserted between the master and the printing paper to separate the printing paper. Each sheet separating member is integrally swingably provided so as to be able to approach and separate from the plate cylinder outer peripheral surface in order to prevent interference with a clamper provided on the plate cylinder outer peripheral surface. In order to prevent the master on the plate cylinder from being damaged by the leading end, the master is arranged near the outer periphery of the plate cylinder so that there is a slight gap between each leading end and the master when approaching.

In the case where an impression cylinder is used as the pressing means, a printed image is transferred by being held on the outer peripheral surface of the impression cylinder by a paper clamper provided on the impression cylinder and then coming into contact with the outer peripheral surface of the plate cylinder. A sheet separating member similar to that described above is used to separate the printing sheet from the outer peripheral surface of the impression cylinder. The plurality of paper separating members are linearly arranged near the outer peripheral surface of the impression cylinder and in the axial direction of the impression cylinder.

[0005]

The plurality of sheet peeling members described above are fixed to one swing shaft, which is a common support shaft, by screwing or the like, or are integrally formed. Here, the leading end of each sheet peeling member enters a minute gap between the master on the plate cylinder outer peripheral surface and the printing paper having a non-image portion at the leading end, or between the impression cylinder outer peripheral surface and the printing paper. Therefore, a predetermined distance from the outer peripheral surface of the plate cylinder or the outer peripheral surface of the impression cylinder is set. Therefore, when the leading end of each sheet peeling member is not linearly arranged in the axial direction of the plate cylinder or the impression cylinder, a gap occurs between the leading end and the outer peripheral surface of the plate cylinder or the outer peripheral surface of the impression cylinder. , Where the leading edge does not enter between the master and the printing paper or between the outer peripheral surface of the impression cylinder and the printing paper, and the printing paper is wound up without being peeled off from the plate cylinder or the impression cylinder. Or the master contacts the master to damage or damage the master.

Then, after fixing each paper peeling member to the support shaft or integrally forming the same, post-processing is performed on each of the leading ends, thereby ensuring the linearity of each leading end in the axial direction of the plate cylinder or the impression cylinder. However, it is conceivable to keep uniform the gap between each tip and the outer peripheral surface of the plate cylinder or the outer peripheral surface of the impression cylinder. However, since this processing can be performed only when the spindle is removed from the stencil printing machine, if the parallelism between the plate cylinder central axis or impression cylinder central axis and the spindle central axis is shifted, each tip is The gap between the portion and the outer peripheral surface of the plate cylinder or the outer peripheral surface of the impression cylinder varies. Further, in order to match the parallelism between the plate cylinder central axis or the impression cylinder central axis and the spindle central axis, considerably severe processing accuracy is required, and there is a problem that a significant increase in cost cannot be avoided.

The present invention solves the above-mentioned problems, and ensures linearity in the axial direction of a plate cylinder or an impression cylinder of a plurality of paper peeling members without increasing the cost, thereby always performing good paper peeling. The purpose of the present invention is to provide a stencil printing apparatus.

[0008]

According to the first aspect of the present invention,
In a stencil printing machine having a plate cylinder around which a master is wound on an outer peripheral surface and a plurality of paper separating members each having a leading end for peeling a printing sheet from the outer peripheral surface of the plate cylinder, the plurality of paper separating members are The distance between the outer peripheral surface of the plate cylinder and each of the tip portions is provided so as to be adjustable.

According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the plurality of paper separating members are configured such that the leading ends thereof can be freely moved toward and away from the outer peripheral surface of the plate cylinder. In addition, it is characterized in that it is integrally swingably supported by a common support shaft.

According to a third aspect of the present invention, there is provided a plate cylinder on which a master is wound around an outer peripheral surface, an impression cylinder for bringing printing paper into contact with the master on the plate cylinder, and an outer peripheral surface of the impression cylinder. In a stencil printing machine having a plurality of paper separating members each having a leading end that comes into contact with the printing paper, for peeling the printing paper, the plurality of paper separating members include an outer peripheral surface of the impression cylinder and the respective leading end. Are provided so as to be adjustable.

According to a fourth aspect of the present invention, in the stencil printing apparatus of the third aspect, the plurality of sheet separating members are further integrally supported by a common support shaft.

According to a fifth aspect of the present invention, in the stencil printing apparatus according to the second or fourth aspect, the plurality of paper separating members are each rotatably supported by the support shaft. And

According to a sixth aspect of the present invention, in the stencil printing machine according to the fifth aspect, the plurality of sheet separating members are further adjusted to adjust a distance between a leading end portion and an outer peripheral surface of the plate cylinder or the impression cylinder. It is characterized by having each mechanism.

According to a seventh aspect of the present invention, in the stencil printing apparatus of the second, fourth, fifth or sixth aspect, one of the plurality of sheet separating members is attached to the support shaft. The paper separation member is fixed, and adjustment of another paper separation member is performed based on the fixed paper separation member.

According to an eighth aspect of the present invention, in the stencil printing apparatus according to the seventh aspect, the distance between the tip of the reference sheet separating member fixed to the support shaft and the outer peripheral surface of the plate cylinder is further adjusted. It has a reference adjustment mechanism that performs the following.

According to a ninth aspect of the present invention, in the stencil printing apparatus according to the seventh or eighth aspect, the reference sheet separating member fixed to the support shaft is located at a position farthest from the front of the operation side. It is characterized by doing.

According to a tenth aspect of the present invention, in the stencil printing machine according to the seventh or eighth aspect, an odd number of the paper separating members are further arranged, and a reference paper separating member fixed to the support shaft is provided. Is located at the center.

According to an eleventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to tenth aspects, further, at least one of the plurality of sheet separating members is provided with the printing plate. It is characterized by having an ejection port for ejecting gas to the outer surface of the cylinder or the impression cylinder.

[0019]

FIG. 1 is a schematic front view of a stencil printing apparatus employing a first embodiment of the present invention. In FIG. 1, the stencil printing apparatus 1 includes an image reading unit 2, a stencil conveying unit 3, a paper feeding unit 4, a printing unit 5, a stencil discharging unit 6, and a paper discharging unit 7. The image reading unit 2 provided on the upper part of the housing 1a of the stencil printing apparatus 1 has a pair of original conveying rollers 8, 9, a reflecting mirror 10, an imaging lens 11, an image sensor 12 such as a CCD, and the like. .

Below the image reading section 2, a plate making and conveying section 3 is provided. The stencil conveying unit 3 includes a master holding member 13,
Platen roller 14, thermal head 15, cutting means 16, master transport roller pair 17, 18, guide plate 1
9, 20, 21 and the like. Master holding member 13
Supports a core 22b of a master roll 22a formed by winding a master 22 in which a thermoplastic resin film and a porous support are bonded together in a roll shape, in a rotatable and detachable manner. The platen roller 14 is driven to rotate clockwise in the figure by a stepping motor (not shown), and the thermal head 15 is pressed against the platen roller 14 by urging means (not shown). The cutting means 16 having an upper blade and a lower blade cuts the master 22 when the upper blade moves up and down with respect to the lower blade. Master transport roller pair 1 consisting of a drive roller and a driven roller pressed against it
Reference numerals 7 and 18 convey the master 22 between the rollers. Guide plates 19 and 20 are provided between the master transport roller pairs 17 and 18, and a guide plate 21 is provided downstream of the master transport roller pair 18 in the master transport direction and fixed to a plate making side plate (not shown).

A sheet feeding section 4 is provided below the plate making and conveying section 3. The paper supply unit 4 includes a paper supply table 23 and a paper supply roller 2.
4, a separation roller 25, a registration roller pair 26, guide plates 27 and 28, and the like. The paper feed table 23 on which the printing paper P is loaded on the upper surface is vertically movably supported by a drive mechanism (not shown). The paper feed roller 24 disposed above the paper feed table 23 is driven to rotate clockwise in the figure by drive means (not shown). The uppermost printing paper P stacked on the paper feeding table 23 is pressed against the paper feeding roller 24 by a predetermined pressure. A separation roller 25 is provided near the left side of the paper feed roller 24. The separation roller 25 has a circumferential surface thereof pressed against a separation pad (not shown) at a predetermined pressure, and the driving force of the sheet feeding roller 24 is transmitted by a driving force transmitting means (not shown), so that the separation roller 25 moves in the same direction as the sheet feeding roller 24. Rotationally driven synchronously. On the left side of the separation roller 25, a registration roller pair 26 composed of a driving roller and a driven roller pressed against the driving roller is disposed. The driving roller of the registration roller pair 26 is driven to rotate by driving means (not shown), and the registration roller pair 26 is fed by the separation roller 25.
After the printing paper P is temporarily stopped, it is fed to the printing unit 5 at a predetermined timing. Registration roller pair 26
Guide plates 27 and 28 fixed to a plate making side plate (not shown) are disposed on the left side of the plate. A paper feed passage is formed in each of the guide plates 27 and 28.

A printing section 5 is provided on the left side of the sheet feeding section 4. The printing unit 5 mainly includes a plate cylinder 29, a press roller 30, and the like. The plate cylinder 29 configured to be capable of vertically feeding A3 paper has a porous support plate made of a thin stainless steel plate or an electroformed nickel plate. 0.25
Many holes having a diameter of about 0.15 to 0.5 mm are formed at intervals of about 1.0 mm. On the surface of the opening portion of the porous support plate, about 1 to 3 layers of a mesh screen of about 100 to 400 meshes woven with polyester or stainless steel fine wire are wound, and the porous support plate is not opened. A stage section formed of a plane (not shown) extending in the axial direction of the plate cylinder 29 and a clamper 31 for holding the tip of the master 22 together with the stage section are arranged on the surface of the section. The clamper 31 is provided with a magnet (not shown), and is provided so as to be magnetically attached to a stage (not shown). When the plate cylinder 29 reaches a predetermined position, the clamper 31 is opened and closed by opening and closing means (not shown). Flanges (not shown) are provided at both ends of the porous support plate. Each flange is rotatably mounted on a support shaft 32 fixed to the housing 1a and also serving as an ink supply pipe via a bearing (not shown). Supported.

Inside the plate cylinder 29, an ink supply means 33 is provided. The ink supply unit 33 mainly includes a support shaft 32, an ink roller 34, and a doctor roller 35. A large number of holes for supplying ink to the inside of the plate cylinder 29 are formed in the surface of the support shaft 32. Support shaft 32
Below the ink roller 34 and the doctor roller 35
And are arranged. The ink roller 34 and the doctor roller 35 are rotatably supported between side plates (not shown) provided in the plate cylinder 29, and are rotationally driven in opposite directions by driving means (not shown). Ink roller 3
The doctor roller 4 and the doctor roller 35 are arranged close to each other such that a slight gap is formed between them, and a wedge-shaped ink reservoir 36 is formed in the vicinity of each outer peripheral surface. The ink supplied from the support shaft 32 to the ink reservoir 36 is supplied to the ink roller 34 and the doctor roller 3.
5 and is supplied to the inner peripheral surface of the plate cylinder 29 via the outer peripheral surface of the ink roller 34. Below the plate cylinder 29, a rotatable press roller 30 which is supported by a swinging means (not shown) and whose outer peripheral surface is freely pressed and separated from the outer peripheral surface of the plate cylinder 29 with a predetermined pressing force is arranged. Has been established. The press roller 30 presses the printing paper P fed from the paper feeding unit 4 against the plate cylinder 29,
A print image is formed on print paper P.

On the left side of the printing section 5, a plate discharging section 6 is provided. The plate discharging section 6 includes an upper plate discharging member 37, a lower plate discharging member 38,
It mainly comprises a plate discharging box 39 and the like. The upper plate discharging member 37 is mainly composed of a driving roller 40 and a driven roller 41 that are rotationally driven by a driving unit (not shown), and an endless belt 42 stretched between the rollers. The lower plate discharging member 38 mainly includes a driving roller 43, a driven roller 44, which is connected and driven by a driving roller 40 and a gear (not shown), and an endless belt 45 stretched between the rollers. The lower plate discharging member 38
The driving roller 43 is provided so as to be movable in the left-right direction about a support shaft of the driving roller 40 by a moving unit (not shown). . A plate discharging box 39 for storing used masters therein is provided detachably with respect to the housing 1a, and a compression plate (not shown) for compressing the stored used masters is provided inside the box.

Below the plate discharging section 6, a paper discharging section 7 is provided. The paper discharge unit 7 includes a peeling claw 46 as a paper separating member,
It has a guide plate 47, a paper discharge transport member 48, a paper discharge tray 49, and the like. The peeling claws 46 for peeling the printing paper P from the outer peripheral surface of the plate cylinder 29 have an acute-angled tip, and as shown in FIG. 2, three peeling claws are provided in the axial direction of the plate cylinder 29. .
Each of the peeling claws 46 has its base portion attached to a support shaft 50 supported by a not-shown claw swinging means provided on the housing 1a. Are provided so as to be swingable integrally with each other so as to be able to freely move toward and away from the outer peripheral surface of the plate cylinder 29. The peeling claws 46 are arranged at regular intervals, and the spacing between the peeling claws 46 located on the outside is the width of the smallest B5 size (182 mm) among the general-purpose standard paper sizes printed by the plate cylinder 29. ) Is set slightly smaller than).

Here, the manner in which each peeling claw 46 is attached to the support shaft 50 will be described. As shown in FIG. 3, the peeling claw 46 located at the center of the three peeling claws 46 has a hole 46a formed at the base end fitted to the support shaft 50, and is screwed from the outside of the base end with a screw 51. Fixed. Screw 51 is
It is screwed into a tap formed on the support shaft 50 via a hole formed in the peeling claw 46. Each peeling claw 46 located on both sides
As shown in FIG. 4, a hole 46a formed at the base end is fitted to the support shaft 50, and is fixed by a set screw 52 from outside the base end. A set screw 52 having an acute-angled tip is screwed into a tap formed on the peeling claw 46.
6 is performed.

Since each of the peeling claws 46 is configured as described above, the position of each peeling claw 46 is adjusted in the following procedure. First, the position of the center peeling claw 46 is adjusted by adjusting the mounting position of the support shaft 50 with respect to a claw swinging means (not shown).
The gap between the tip portion and the outer peripheral surface of the plate cylinder 29 is an appropriate gap G.
(See FIG. 3) is determined using a jig such as a gap gauge (not shown). At this time, each of the peeling claws 46 located on both sides is located at a position where the tip end is farther from the outer peripheral surface of the plate cylinder 29 than the central peeling claw 46. next,
The position of each of the peeling claws 46 on both sides is determined by a gap G (FIG. 4) in which the gap between the tip end portion and the outer peripheral surface of the plate cylinder 29 is the same as that of the central peeling claw 46.
(Refer to FIG. 2) using a jig (not shown). Adjustment is performed with each peeling claw 46 set with the set screw 52 loosened.
Positioning is performed by applying a jig to the tip of the, and the set screw 52 is tightened in this state. By the above procedure, all three peeling claws 46 are adjusted to appropriate positions.

A guide plate 47 is provided on the left side of the press roller 30 and below the peeling claw 46. The guide plate 47 is fixed to a side plate (not shown) of the housing 1 a, and guides the printing paper P peeled from the outer peripheral surface of the plate cylinder 29 by the peeling claw 46 to the paper discharge transport member 48. On the left side of the guide plate 47, a paper discharge transport member 48 is disposed. The paper discharge conveying member 48 includes a driving roller 53, a driven roller 54, a plurality of endless belts 55 stretched between the rollers, a suction fan 56, and the like, which are driven to rotate counterclockwise in FIG. And transports the printing paper P toward the left in the figure while holding the printing paper P on the endless belt 55 by the suction force of the suction fan 56. A discharge tray 49 is disposed on the left side of the discharge conveyance member 48.
The discharge tray 49 on which the printed printing paper P is stacked has a pair of side fences 57 and an end fence 58 for aligning the printing paper P.

The operation of the stencil printing apparatus 1 based on the above configuration will be described below. When a document is set on the image reading unit 2 and an operator presses a plate making start key (not shown), the document transport roller pairs 8 and 9 rotate to feed the document, and the reflection mirror 10 scans the document image. The scanned document image is formed by the imaging lens 11 and then sent to the image sensor 12. After receiving the document image information, the image sensor 12 converts the information into an image data signal, and outputs the image data signal to control means (not shown) for controlling the thermal head 15.

In parallel with the image reading operation of the image reading unit 2, the plate discharging unit 6 performs a plate discharging operation of separating the used master from the outer peripheral surface of the plate cylinder 29. The plate cylinder 29 on which the used master is wound on the outer peripheral surface is rotated in a counterclockwise direction in FIG. 1 by a plate cylinder driving unit (not shown). When the plate cylinder 29 reaches a predetermined plate discharging position where the rear end of the used master wound on the outer peripheral surface and the drive roller 43 correspond to each other, the respective drive rollers 40 and 43 are driven to rotate and move downward. The plate discharging member 38 is moved to the plate cylinder 29 side. When the outer peripheral surface of the drive roller 43 came into contact with the used master on the outer peripheral surface of the plate cylinder 29, the plate cylinder 29 continued to rotate in the counterclockwise direction, and was brought into contact with the drive roller 43 and picked up. The used master is sandwiched between the lower plate discharging member 38 and the upper plate discharging member 37 and is peeled from the outer peripheral surface of the plate cylinder 29. The peeled used master is the lower plate discharging member 3
After being conveyed by the plate discharge member 8 and the upper plate discharge member 37 and discarded in the plate discharge box 39, it is compressed by a compression plate (not shown). After all the used masters have been peeled off from the outer peripheral surface of the plate cylinder 29, the plate cylinder 29 further continues to rotate, and when the plate cylinder 29 reaches a predetermined plate feeding position shown in FIG. The operation of the driving means is stopped, and the opening / closing means (not shown) is operated, so that the clamper 31 is opened as shown in FIG. 1 and the plate cylinder 29 is in a plate feeding standby state.

When the plate cylinder 29 enters the plate feeding standby state and the plate discharging operation is completed, the plate making operation is performed subsequently. When the clamper 31 is opened, the platen roller 14 and the master transport roller pairs 17 and 18 are driven to rotate, and the master 22 is pulled out from the master roll 22a. In the drawn-out master 22, the heating element of the thermal head 15 selectively generates heat based on the image data signal, so that the thermoplastic resin film surface is hot-melt-perforated, and a plate-making image is formed. The master 22 having the plate making image formed thereon is guided by the guide plates 19, 20, and 21 while being clamped by the clamper 31.
Transported to When the control unit (not shown) recognizes that the leading end of the master 22 has been transported to the predetermined position between the clamper 31 and the stage unit (not shown) based on the number of steps of the stepping motor (not shown) that rotationally drives the platen roller 14, The opening / closing means (not shown) is operated to close the clamper 31, and the leading end of the master 22 is locked on the outer peripheral surface of the plate cylinder 29.

When the leading end of the master 22 is locked on the outer peripheral surface, the plate cylinder 29 starts to rotate again at the same peripheral speed as the master transport speed. When a control unit (not shown) recognizes that plate making for one plate has been completed based on the number of steps of a stepping motor (not shown) that rotationally drives the platen roller 15, the rotation of the platen roller 15 and the master transport roller pairs 17 and 18 is performed. Is stopped and the cutting means 6 is operated, and the master 22 is cut off. The cut master 22 is pulled out by the rotation of the plate cylinder 29,
Reaches a predetermined home position, the operation of the plate cylinder driving means (not shown) is stopped, and the winding operation is completed.

Following the winding operation, a plate attaching operation is performed. After the winding operation is completed, a plate cylinder driving unit (not shown) is operated, and the plate cylinder 29 is driven to rotate at a low speed in the clockwise direction in FIG. 1, and the sheet feeding roller 24, the separation roller 25, the driving roller 53, and the suction fan 56 are respectively driven. Due to the rotation of the paper feed roller 24 and the separation roller 25, only the uppermost one of the print papers P stacked on the paper feed table 23 is drawn out, and the drawn out print paper P has its leading end paired with the registration roller. In addition to 26.
The registration roller pair 26 rotates at a predetermined timing,
The printing paper P is fed between the plate cylinder 29 and the press roller 30. The fed printing paper P is pressed by a press roller 30 which is oscillated by oscillating means (not shown).
9 is pressed with a predetermined pressing force. Due to this pressing operation, the press roller 30 and the outer peripheral surface of the plate cylinder 29 are pressed against each other via the printing paper P and the master 22 that has been made, and the ink supplied to the inner surface of the plate cylinder 29 by the ink roller 34 is used for opening the plate cylinder. The printing paper P is transferred to the printing paper P through the opening, the mesh screen opening, and the master perforation, and a print image is formed on the printing paper P. The printing paper P to which the ink has been transferred is peeled off from the outer peripheral surface of the plate cylinder 29 at the leading end of each peeling claw 46, guided by the guide plate 47, and sent to the paper discharge transport member 48. The printing paper P held on the endless belt 55 by the suction force of the suction fan 56 is conveyed to the left and discharged onto the discharge tray 49, and the printing operation is completed.
After the printing operation is completed, the printing drum 29 is rotated to the home position and stopped, and the stencil printing machine 1 is in a printing standby state.

When the operator presses a print start key (not shown) after the stencil printing apparatus 1 is in the printing standby state, the plate cylinder 29 is driven to rotate at a higher speed than at the time of stencil printing. Separation roller 25
Is driven to rotate, and the printing paper P is continuously fed from the paper feeding unit 4 to perform a printing operation. Since the gap G between the outer peripheral surface of the plate cylinder 29 and each of the separation claws 46 is adjusted to an optimum value during the above-described printing and printing, each gap between the outer peripheral surface of the plate cylinder 29 and the printing paper P is adjusted. Since the leading ends of the peeling claws 46 are securely inserted, the printing paper P can be satisfactorily peeled from the plate cylinder 29, and curling can be prevented from occurring, thereby preventing printing failure.

FIGS. 5 and 6 show a peeling claw 59 as a sheet separating member used in the second embodiment of the present invention.
The peeling claw 59 has a claw portion 59 a having an acute-angled tip for peeling the printing paper P from the outer peripheral surface of the plate cylinder 29, and a claw portion 59.
a supporting portion 59b for supporting the a. The peeling claws 59 are used in place of the peeling claws 46 located on both sides in the first embodiment.

A hole 59c is formed at the base end of the claw portion 59a, and the end portion protrudes upward in a plate shape to form a protruding portion 59d. Has a hole. The cylindrical support portion 59b having the hole portion 59e has the hole portion 59e fitted on a support shaft 60 supported by a not-shown claw swinging means provided on the housing 1a, and is provided with a screw or an adhesive (not shown). Is fixed to the support shaft 60 by the above method. A hole 59e is provided on one side of the support portion 59b.
And a hole 59f having the same diameter as that of the hole 59.
A cylindrical portion 59g formed slightly smaller than c is provided integrally, and a claw portion 59a is rotatably attached to the support portion 59b by fitting a hole 59c into the cylindrical portion 59g. I have. A projecting portion 59h facing the projecting portion 59d is integrally formed with an outer peripheral portion of the supporting portion 59b located substantially on the center line of the hole 59e, and the projecting portion 59h extends to a position above the cylindrical portion 59g. Is formed.
Holes of the same diameter are formed in the protruding portion 59h at positions facing the holes formed in the protruding portion 59d, and a screw 59i having a head fixed to the outer surface of the protruding portion 59h is formed in each hole. Are threaded through. A compression coil spring 59j is provided on the thread between the protrusions 59d and 59h.
A nut 59k is screwed into a screw portion of the screw 59i projecting from the projecting portion 59d.

According to the above-described configuration, by turning the nut 59k, the interval between the projecting portions 59d and 59h changes,
As a result, the gap G between the tip of the claw portion 59a of the peeling claw 59 and the outer peripheral surface of the plate cylinder 29 changes, so that the adjustment operation of the gap G can be facilitated as compared with the first embodiment. . In the second embodiment, each protrusion 59d, 59h, screw 5
9i, the compression coil spring 59j, the nut 59k, and the cylindrical portion 59g constitute an adjusting mechanism 59l for adjusting the distance between the outer peripheral surface of the plate cylinder 29 and the tip of the claw portion 59a.

FIG. 7 shows a peeling claw 61 as a sheet separating member used in the third embodiment of the present invention. The peeling claw 61 adjusts a gap between the claw portion 61 a having an acute-angled tip portion for peeling the printing paper P from the outer peripheral surface of the plate cylinder 29, and a gap between the tip portion of the claw portion 61 a and the outer peripheral surface of the plate cylinder 29. The peeling claw 61 including the reference adjusting mechanism 61b is used in place of the peeling claw 46 located at the center in the first embodiment.

A hole 61c is formed at the base end of the claw 61a, and the claw 61a is fitted and fixed in the hole 61c, so that a claw swinging means (not shown) provided on the housing 1a. Are integrally supported by a support shaft 62 supported by the shaft. The reference adjustment mechanism 61b includes an adjustment arm 61d, a screw 61e,
Nut 61f, stopper 61g, tension coil spring 61
h and the like. The adjustment arm 61d made of a plate material has a hole 61i having the same diameter as the hole 61c at one end thereof, and the support shaft 62 is fitted into the hole 61i so that the claw 61a is viewed from the front of the apparatus. The claw portion 61 a and the support shaft 62 are integrally attached to the front side surface.
At a substantially central portion of the side of the adjusting arm 61d on the side of the claw portion 61a, a folded back portion 61 partially folded back toward the apparatus front side.
j is formed, and a hole is formed near the other end of the folded portion 61j. Claw portion 61a of folded portion 61j
A nut 61 having a threaded portion with a slightly smaller diameter than this hole is provided on a surface opposite to the side and corresponding to the hole formed.
The nut 61f has a screw 61e attached thereto.
Is screwed. The screw portion of the screw 61e is a nut 61
It protrudes from the surface of the folded portion 61j on the side of the claw portion 61a via f. A stopper 61g made of a substantially S-shaped plate is provided below the claw portion 61a. One end of the stopper 61g is fixed to the housing 1a, and the stopper 61g is arranged at a position where the tip of the screw portion of the screw 61e abuts on the other end. A tension coil spring 61h is provided between the other end of the adjustment arm 61d and one end of the stopper 61g.
Is stretched.

With the above-described configuration, the distance between the folded portion 61j and the other end of the stopper 61g is changed by turning the screw 61e, whereby the claw portion 61a, the adjusting arm 61d, and the support shaft 62 swing integrally. As a result, the gap G between the tip of the claw 61a and the outer peripheral surface of the plate cylinder 29 changes, so that the operation of adjusting the gap G can be facilitated as compared with the first embodiment. By using the peeling claw 61 shown in the third embodiment together with the peeling claw 59 shown in the second embodiment, the work of adjusting the gap G can be further facilitated.

In each of the above embodiments, three stripping claws 46, 59, and 61 as sheet separating members are provided in the axial direction of the plate cylinder 29, respectively, and the configuration based on the stripping nail at the center is shown. The arrangement of the peeling claws is not limited to this, and two, four, five or more peeling claws may be provided in the axial direction of the plate cylinder 29. When an odd number such as three or five is provided, there are a configuration based on the center peeling nail as shown in the embodiment and a configuration based on the innermost peeling nail from the front side of the apparatus. Also, when providing an even number such as two or four, there are a configuration based on an arbitrary peeling claw and a configuration based on the innermost peeling claw. When the innermost peeling claw is used as a reference, the adjustment work can be performed sequentially from the back side to the front side, and the work efficiency is improved.

In the first to third embodiments, the paper separating member for separating the printing paper from the outer peripheral surface of the plate cylinder has been described. However, the paper separating member to which the present invention can be applied is not limited thereto. The present invention may be applied to a device that separates printing paper from the outer peripheral surface of an impression cylinder. Hereinafter, this example will be described as a fourth embodiment.

FIG. 8 shows a stencil printing apparatus 63 employing a fourth embodiment of the present invention. This stencil printing machine 63
Has an image reading unit 64, a plate making and conveying unit 65, a paper feeding unit 66, a printing unit 67, a plate discharging unit 68, and a paper discharging unit 69. Note that the image reading section 64 includes the image reading section 2 and the plate making and conveying section 65.
Is the plate making / conveying section 3, the sheet feeding section 66 is the sheet feeding section 4, and the plate discharging section 6
8 can adopt the same configuration as that of the plate discharging section 6, and a detailed description thereof will be omitted.

The printing section 67 disposed substantially at the center of the casing 63a of the stencil printing apparatus 63 is mainly composed of a plate cylinder 70, an impression cylinder 71 and the like. The plate cylinder 70 having the same configuration as the plate cylinder 29 has a clamper 72 which can be opened and closed on the outer peripheral surface, and is rotatably supported by a support shaft 73 which also serves as an ink supply pipe. An ink supply unit 7 having an ink roller 74 and a doctor roller 75 is provided inside the plate cylinder 70.
The ink from the ink supply means 76 is supplied to a master 77 having a plate made by the clamper 72 and having a leading end locked.

An impression cylinder 71 is provided below the plate cylinder 70. The impression cylinder 71 is rotatably supported by a pair of arms 78 with support shafts 71a provided on both side surfaces, and is rotationally driven in a reverse direction in synchronization with the plate cylinder 70 by driving means (not shown). One end of each arm 78 has a housing 63a.
And a tension spring 80 is attached to the other end thereof, and the impression cylinder 71 is rotated by a swinging means (not shown).
Are provided so as to be able to approach and separate from the outer peripheral surface of the. Impression cylinder 71
A concave portion 71b for avoiding interference with the clamper 72 is formed on the outer peripheral surface of the printing drum P.
And a holding claw 81 for holding the same. The gripper 81 is opened and closed at a predetermined position in accordance with the rotation of the impression cylinder 71 by a nail opening / closing means (not shown).

A paper discharge unit 69 is provided on the left side of the print unit 67. The paper discharge unit 69 includes a peeling claw 82 as a paper separating member, a paper discharge conveyance member 83, a paper discharge tray 84, and the like. Here, the paper discharge conveyance member 83 and the paper discharge tray 84
Since the same configuration as the paper discharge transport member 48 and the paper discharge tray 49 shown in the first embodiment can be adopted, detailed description of each is omitted. A plurality of peeling claws 82 provided near the outer peripheral surface of the impression cylinder 71 and arranged in the width direction of the impression cylinder 71 (the depth direction in FIG. 8) are fixed between side plates (not shown) of the housing 63a. It is attached to a support shaft 85. The attachment of each of the peeling claws 82 to the support shaft 85 is performed in the first to third directions described above.
In this embodiment, the gap between the distal end of each peeling claw 82 and the outer peripheral surface of the impression cylinder 71 can be adjusted.

The operation of the stencil printing machine 63 based on the above configuration will be described below. When a document is set on the image reading section 64 and an operator presses a plate making start key (not shown), an image reading operation is performed in the same manner as in the first embodiment. In parallel with the image reading operation of the image reading section 64, the plate discharging section 68 performs a plate discharging operation of separating the used master from the outer peripheral surface of the plate cylinder 70. After the used master has been completely peeled off from the outer peripheral surface of the plate cylinder 70, when the plate cylinder 70 reaches a predetermined plate feeding position, an opening / closing means (not shown) is operated to open the clamper 72, and the plate cylinder 70 It goes into a standby state.

When the plate cylinder 70 is in the plate-supply standby state, a plate-making operation is subsequently performed in the plate-making transport section 65. The master 77 on which the plate making image has been formed by the plate making and transporting section 65 is conveyed to the clamper 72, and when the leading end of the master 77 reaches a predetermined position, the opening / closing means (not shown) operates to operate the clamper
2 is closed, and the leading end of the master 77 is locked on the outer peripheral surface of the plate cylinder 70. When the leading end of the master 77 is locked on the outer peripheral surface, the plate cylinder 70 starts to rotate again at the same peripheral speed as the master transport speed, and the control means (not shown) recognizes that plate making for one plate has been completed. Then, the master making operation is stopped, and the cutting means (not shown) is operated to cut the master 77. The cut master 77 is pulled out by the rotation of the plate cylinder 70, and when the plate cylinder 70 reaches a predetermined home position, the operation of the plate cylinder driving means (not shown) is stopped, and the winding operation is completed.

After the completion of the winding operation, the plate cylinder 70 is driven to rotate at a low speed, and one sheet of printing paper P is separated and fed from the sheet feeding section 66. After the printing paper P separated and fed is temporarily stopped by the pair of registration rollers, the printing paper P is fed toward the impression cylinder 71 at a predetermined timing when the gripper 81 is opened. The fed printing paper P is held on the outer peripheral surface of the impression cylinder 71 by closing the opened gripper 81, and the plate cylinder 70 is swung by the impression cylinder 71 which is swung by a swinging means (not shown).
Is pressed with a predetermined pressing force. By this pressing operation, the impression cylinder 71 and the plate cylinder 70 are pressed against each other via the printing paper P and the master 77 that has undergone plate making, and the ink supplied to the inner surface of the plate cylinder 70 by the ink roller 74 passes through the plate cylinder opening,
The printing paper P is transferred to the printing paper P via the mesh screen opening and the master perforation, and a print image is formed on the printing paper P. The printing paper P to which the ink has been transferred is peeled off from the outer peripheral surface of the impression cylinder 71 at the tip of each of the peeling claws 82 after the gripper 81 is opened at a predetermined timing, and the paper discharge transport member 83
And is discharged onto the paper discharge tray 49 through the, and the plate attaching operation is completed. After the completion of the printing operation, the printing drum 70 rotates to the home position and stops, and the stencil printing machine 63 enters a printing standby state.

After the stencil printing device 63 is in the printing standby state, when the operator presses a print start key (not shown), the plate cylinder 70 is driven to rotate at a higher speed than at the time of plate setting, and Printing paper P is continuously fed to perform a printing operation. Since the gap between the outer peripheral surface of the impression cylinder 71 and each separation claw 82 is adjusted to an optimum value during the above-described printing and printing, each peeling between the outer peripheral surface of the impression cylinder 71 and the printing paper P is performed. Since the tips of the claws 82 enter the respective portions reliably, the printing paper P can be satisfactorily separated from the impression cylinder 71, and the printing paper P is wound around without being separated from the outer peripheral surface of the impression cylinder 71. It is possible to prevent the occurrence of printing defects such as curling.

In the first to fourth embodiments, the peeling claw 4 having an acute-angled tip as a paper separating member is used.
6, 59, 61 and 82 are shown, but as a sheet separating member, for example, Japanese Utility Model Publication No. 4-15509,
No. 2878, Japanese Unexamined Patent Publication No. 11-334191, and the like, a device having a jet port for jetting gas to the outer peripheral surface of a plate cylinder or an impression cylinder at its tip end may be used. Good. As a result, the sheet separating performance can be greatly improved as compared with the sheet separating member described in each embodiment.

[0052]

According to the first, second, fifth, seventh and tenth aspects of the present invention, the distance between the outer peripheral surface of the plate cylinder and the plurality of sheet separating members is set to an optimum value. It can be adjusted, and when the paper is peeled off from the outer peripheral surface of the plate cylinder, the leading end of each paper separating member is securely inserted between the outer peripheral surface of the plate cylinder and the printing paper. It is possible to perform the printing satisfactorily, and it is possible to prevent the occurrence of curling and the occurrence of printing failure.

According to the third and fourth aspects of the present invention,
The spacing between the outer peripheral surface of the impression cylinder and the plurality of paper separating members can be adjusted to respective optimum values, and each sheet is separated between the outer peripheral surface of the impression cylinder and the printing paper when the paper is separated from the outer peripheral surface of the impression cylinder. Since the leading end of the member is securely inserted, it is possible to satisfactorily separate the printing paper from the impression cylinder, thereby preventing the occurrence of printing failure.

According to the sixth aspect of the present invention, the distance between the leading end of each sheet separating member and the outer peripheral surface of the plate cylinder can be adjusted by operating the adjusting mechanism, thereby facilitating the adjusting operation. Can be.

According to the eighth aspect of the present invention, the distance between the leading end of the sheet separating member and the outer peripheral surface of the plate cylinder can be adjusted by operating the reference adjusting mechanism, thereby facilitating the adjustment operation. Can be

According to the ninth aspect of the present invention, the adjustment work can be performed sequentially from the back side to the front side, and the work efficiency can be improved.

According to the eleventh aspect of the present invention, by ejecting the gas, the sheet separation performance can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a stencil printing apparatus employing a first embodiment of the present invention.

FIG. 2 is a partial plan view of a plate body illustrating a sheet separating member used in the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional front view of a reference sheet separating member used in the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional front view of a sheet separating member used in the first embodiment of the present invention.

FIG. 5 is a front view of a sheet separating member used in a second embodiment of the present invention.

FIG. 6 is a side view of a sheet separating member used in a second embodiment of the present invention as viewed from a downstream side in a sheet conveying direction.

FIG. 7 is a front view of a sheet separating member used in a third embodiment of the present invention.

FIG. 8 is a schematic front view of a stencil printing apparatus employing a fourth embodiment of the present invention.

[Explanation of symbols]

 1,63 stencil printing machine 22,77 master 29,70 plate cylinder 46,59,61,82 sheet separation member (peeling claw) 50,60,62,85 support shaft 59l adjustment mechanism 61b reference adjustment mechanism 71 impression cylinder G interval (Gap) P Printing paper

Claims (11)

[Claims] 1. A stencil printing machine comprising: a plate cylinder on which a master is wound around an outer peripheral surface; and a plurality of sheet separating members each having a leading end for peeling printing paper from the outer peripheral surface of the plate cylinder. The stencil printing apparatus according to claim 1, wherein the paper separating member is provided such that a distance between an outer peripheral surface of the plate cylinder and each of the leading ends can be adjusted. 2. A plurality of paper separating members are integrally and swingably supported by a common support shaft such that the leading end portions can be freely moved toward and away from the outer peripheral surface of the plate cylinder. The stencil printing apparatus according to claim 1, wherein 3. A plate cylinder on which a master is wound around an outer peripheral surface, an impression cylinder for bringing printing paper into contact with the master on the plate cylinder,
In a stencil printing machine having a plurality of paper separating members each having a leading end that comes into contact with the printing paper, the stencil printing device peels off the printing paper from the outer peripheral surface of the impression cylinder. A stencil printing apparatus, wherein the distance between an outer peripheral surface and each of the tip portions is provided so as to be adjustable. 4. The stencil printing apparatus according to claim 3, wherein said plurality of sheet separating members are integrally supported by a common support shaft. 5. The stencil printing apparatus according to claim 2, wherein said plurality of sheet separating members are rotatably supported by said support shafts. 6. The stencil printing apparatus according to claim 5, wherein each of the plurality of sheet separating members has an adjusting mechanism for adjusting a distance between a leading end portion and an outer peripheral surface of the plate cylinder or the impression cylinder. . 7. The paper separating member according to claim 1, wherein one of said plurality of sheet separating members is fixed to said support shaft, and adjustment of another sheet separating member is performed based on said fixed sheet separating member. 2. A stencil printing apparatus according to claim 4, claim 5, or claim 6. 8. A stencil printing machine according to claim 7, further comprising a reference adjusting mechanism for adjusting a distance between an end of a reference sheet separating member fixed to said support shaft and an outer peripheral surface of said plate cylinder. apparatus. 9. The stencil printing apparatus according to claim 7, wherein the reference sheet separating member fixed to the support shaft is located farthest from the front of the operation side. 10. The stencil according to claim 7, wherein an odd number of said sheet separating members are arranged, and a reference sheet separating member fixed to said support shaft is located at the center. Printing device. 11. The apparatus according to claim 1, wherein at least one of said plurality of sheet separating members has a jet port for jetting gas to an outer peripheral surface of said plate cylinder or said impression cylinder. Item 11. A stencil printing apparatus according to any one of items 10.