JP3143281B2 - 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 stencil printing machine.

[0002]

2. Description of the Related Art Digital thermosensitive stencil printing is well known as a simpler printing method than before. The master used for the stencil printing has a laminate structure in which a thermoplastic resin film and a support made of a mixture of Japanese paper and synthetic fibers or a mixture of Japanese paper and synthetic fibers are laminated.
In the stencil printing, the film surface of the master is brought into contact with a thermal head in which fine heating elements are arranged in a line, and the heating elements are conveyed while being energized in a pulsed manner. The perforated plate-making master is wound around the outer peripheral surface of a plate cylinder composed of a porous cylindrical support and a mesh screen layer that is a mesh of resin or metal fiber, and the plate is passed through the plate-made master. Printing is performed by pressing the printing paper against the cylinder by a pressing means such as a press roller, and transferring the ink that has oozed out to the printing paper through the opening of the plate cylinder and the perforated portion of the master plate.

[0003] Ink is supplied as a uniform film to the outer surface of an ink roller in the plate cylinder, and the ink roller contacts the inner peripheral surface of the plate cylinder when the plate cylinder is pressed by a pressing means such as a press roller. Bleeding from the perforations of the plate cylinder, the mesh screen layer, the support of the master and the perforations of the film, and are transferred to the printing paper. The ink supplied from the ink roller to the inner peripheral surface of the plate cylinder is always consumed in the perforated portion of the plate-making master, that is, in the image forming portion, but is not perforated and has no image formed thereon. Since the portion is not consumed at all, a larger amount of ink is accumulated in the non-image forming portion than in the image forming portion where ink is always consumed. During printing in this state, the non-image forming portion is sandwiched between the press roller and the ink roller and receives the pressing force. If printing is continued for a long time or for a long time, the ink in the portion softens and the ink flows. The sex will be better.

When printing is completed, a new document is set, the next master is perforated and prepressed, and when this next prepressed master is wound around the plate cylinder, the image forming portion of the next prepressed master is replaced with the previous one. If the non-image forming part of the pre-printed master is mounted on top of the non-image forming part of the master, the ink in the non-image forming part of the previous pre-printed master, which has increased fluidity, will seep out a large amount of the ink. However, when the image density of the image forming portion of the next pre-made master becomes high and the image forming portion of the previous pre-made master is black-and-white printing, for example, the black-and-white printing portion is reversed and becomes a ghost image. As shown in FIG. 9 (a), this ghost phenomenon is caused by a black-printed image of the previous plate-making master being an A character, and the plate-making master shown in FIG. , A halftone like a photograph in the position of the plate cylinder corresponding to the position of the letter A,
This occurs particularly when an image of the next plate-making master (shown in FIG. 9B) is wound. That is, when a halftone portion (shown in FIG. 9B), which is an image forming portion of the next plate-making master, is printed, the image forming portion A of the previous plate-making master (shown in FIG. 9A). When the half-tone portion of the next pre-mastered master is wound and printed on the portion to be wound around the plate cylinder, the ink of the image forming portion A of the previous pre-mastered master is always consumed, so Since the ink does not soften, the image portion printed corresponding to the image forming portion A of the previous plate-making master is printed while maintaining a substantially halftone image density with little change in the ink image density. on the other hand,
The halftone portion of the image printed corresponding to the non-image forming portion excluding the image forming portion A of the previous plate-making master is
A ghost image in which a large amount of ink oozes out of the non-image forming part of the previous plate-making master because the ink in that part bleeds out. Becomes

[0005] When the stencil printing apparatus is left for a long time after printing, the volatile matter (water or solvent) of the ink evaporates, and the viscosity of the ink further decreases. Further, the ink becomes easier to flow and a larger amount of ink oozes out, so that the density of the ink image becomes higher and the ghost phenomenon occurs more remarkably.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-18284 or Japanese Patent Application Laid-Open No. Hei 3-175081, for example, the generation of "broken paper" (broken paper) is minimized, and For the purpose of providing a printing apparatus capable of obtaining a complete printed matter from printing paper, a technique has been proposed in which a pre-made master or an unmade master is wound around a plate cylinder and pressed a predetermined number of times by a press roller.

[0007]

However, in the above-mentioned technology, the plate cylinder is simply pressed in the same manner as ordinary stencil printing via a master or a master, and the old or used master is not pressed. The ink that has accumulated and softened in the unperforated plate-making portion (non-image forming portion) and the ink that is pushed in from the inner peripheral side of the plate cylinder by the press of the press roller to be replenished are relative to each other in the circumferential direction of the plate cylinder. The problem of occurrence of a ghost phenomenon could not be solved because they do not mix due to little movement.

Accordingly, an object of the present invention is to provide a stencil printing apparatus which does not cause a ghost phenomenon in order to solve such a problem.

[0009]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a perforated master made by perforating and making a plate is wound around the outer peripheral surface of a porous cylindrical plate cylinder. Ink is supplied from the inner peripheral side of the cylinder, the printing paper is pressed against the plate cylinder via the plate-formed master by a pressing means, and the ink that has oozed through the perforated portion of the plate-formed master is printed. In a stencil printing machine in which the transfer is made to paper and printing is performed, and the used master is separated from the plate cylinder after the printing and discarded, the ink on the outer surface layer of the plate cylinder is made uniform with respect to the outer peripheral surface. A sliding contact member which can be freely contacted and separated, and a sliding contact position where the sliding contact member is in sliding contact with the outer peripheral surface immediately before or after the used master is peeled, and a non-sliding contact position which is separated from the sliding contact position. Sliding contact member displacing means for causing Immediately before or after peeling off the already master, and the sliding member is configured to be equipped with a rotary drive means for rotating a predetermined number of times the plate cylinder while away against the said outer peripheral surface.

According to a second aspect of the present invention, a perforated master having a perforated plate is wound around an outer peripheral surface of a porous cylindrical plate cylinder, and ink is supplied from an inner peripheral side of the plate cylinder. Pressing the printing paper against the plate cylinder by pressing means via
In the stencil printing machine for transferring the ink oozed through the perforated portion of the pre-printed master to the printing paper to perform printing, and peeling the used master from the plate cylinder after printing and discarding the used master, For uniformizing the ink on the inner peripheral surface layer, a sliding contact member that can freely contact and separate from the inner peripheral surface of the plate cylinder, and before or after peeling the used master, the sliding contact member is A sliding contact member displacing means for selectively displacing a sliding contact position in sliding contact with the peripheral surface and a non-sliding contact position separated from the sliding contact position; and before or after peeling the used master, the sliding contact member A rotation driving unit configured to rotate the plate cylinder a predetermined number of times while contacting and separating from the inner peripheral surface.

According to a third aspect of the present invention, a perforated master having a perforated plate is wound around the outer peripheral surface of a porous cylindrical plate cylinder, and ink is supplied from the inner peripheral side of the plate cylinder. Pressing the printing paper against the plate cylinder by pressing means via
In the stencil printing apparatus for transferring the ink oozed through the perforated portion of the master made by printing onto the printing paper to perform printing, and peeling and discarding the used master from the plate cylinder after printing, the pressing means, A stirring roller which is switchable and which is capable of coming and going with respect to the outer peripheral surface for uniformizing the ink on the outer peripheral surface portion of the plate cylinder, and the agitating roller immediately before or after peeling the used master. Agitating roller displacement means for selectively displacing a press-contact position for press-contacting the outer peripheral surface and a non-press-contact position separated from the press-contact position, and immediately before or after peeling the used master,
A rotation driving unit configured to rotate the plate cylinder a predetermined number of times while moving the stirring roller toward and away from the outer peripheral surface.

According to a fourth aspect of the present invention, a perforated master having a perforated plate is wound around an outer peripheral surface of a porous cylindrical plate cylinder, and ink is supplied from an inner peripheral side of the plate cylinder. Pressing the printing paper against the plate cylinder by pressing means via
In the stencil printing apparatus for transferring the ink oozed through the perforated portion of the master made by printing onto the printing paper to perform printing, and peeling and discarding the used master from the plate cylinder after printing, the pressing means, A sheet member that can be displaced between an operation position inserted between the plate cylinder and a standby position retracted outside the printing paper conveyance path, and immediately before or after peeling the used master, the sheet member Sheet displacing means for selectively displacing the operating position and the standby position; and immediately before or after peeling the used master, displacing the sheet member between the operating position and the standby position. A rotation driving means for rotating the plate cylinder a predetermined number of times.

According to a fifth aspect of the present invention, a perforated master having a perforated plate is wound around an outer peripheral surface of a porous cylindrical plate cylinder, and ink is supplied from an inner peripheral side of the plate cylinder. Pressing the printing paper against the plate cylinder by pressing means via
In the stencil printing machine for transferring the ink oozed through the perforated portion of the pre-printed master to the printing paper to perform printing, and peeling the used master from the plate cylinder after printing and discarding the used master, Heat roller for heating and uniforming the ink on the outer peripheral surface portion, and a heat roller that can be freely attached to and detached from the outer peripheral surface, before or after peeling the used master,
A heat roller displacing means for selectively displacing the heat roller to a pressure contact position for pressing against the outer peripheral surface and a non-pressure contact position separated from the pressure contact position, and before or after peeling the used master, the heat roller A rotation driving unit configured to rotate the plate cylinder a predetermined number of times while contacting and separating from the outer peripheral surface.

According to a sixth aspect of the present invention, a perforated master having a perforated plate is wound around the outer peripheral surface of a porous cylindrical plate cylinder, and ink is supplied from the inner peripheral side of the plate cylinder. Pressing the printing paper against the plate cylinder by pressing means via
In the stencil printing machine for transferring the ink oozed through the perforated portion of the pre-printed master to the printing paper to perform printing, and peeling the used master from the plate cylinder after printing and discarding the used master, A heat roller that can be brought into contact with and separated from the inner peripheral surface of the plate cylinder for heating and uniformizing the ink on the inner peripheral surface portion, and before or after peeling the used master, A heat roller displacing means for selectively displacing a press-contact position pressed against the inner peripheral surface and a non-press-contact position separated from the press contact position; and before or after peeling the used master, the heat roller is moved to the inner peripheral surface. Rotation driving means for rotating the plate cylinder a predetermined number of times while contacting and separating the plate cylinder.

According to a seventh aspect of the present invention, there is provided a stencil printing apparatus according to any one of the first to sixth aspects, wherein the printing time by the prepressed master or the time until the next prepressed master is wound. The stencil printing apparatus is provided with a rotation number selecting means for selecting the predetermined number of times according to the idle time of the stencil printing apparatus.

[0016]

According to the first aspect of the invention, just before or after the used master is peeled off, the sliding contact member is moved toward and away from the outer peripheral surface of the plate cylinder by the sliding member displacement means, and the rotation driving means rotates the plate cylinder. Is rotated a predetermined number of times, so that the ink on the outer surface layer of the plate cylinder is rubbed and mixed with new ink supplied from the inner peripheral side of the plate cylinder by a sliding contact member, thereby being made uniform.

According to the second aspect of the invention, before or after the used master is peeled off, the sliding contact member is moved toward and away from the inner peripheral surface of the plate cylinder by the sliding member displacement means, and the plate is rotated by the rotation driving means. By rotating the cylinder a predetermined number of times, new ink on the inner peripheral surface of the plate cylinder is pushed out to the outer peripheral surface of the plate cylinder. When the next prepressed master is pressed by the pressing means after being wound around the plate cylinder, the new ink pushed out to the outer peripheral surface of the plate cylinder becomes softened ink sandwiched between the plate cylinder and the prepressed master. By pressing and spreading, the new ink and the softened ink are mixed and uniformized.

In addition, a large amount of ink adheres to the used master when the used master is peeled off and discarded (discharged), and a large amount of ink is removed. Is extruded to the outer surface layer of the plate cylinder.

According to the third aspect of the present invention, immediately before or after peeling the used master, the stirring roller is moved toward and away from the outer peripheral surface of the plate cylinder by the stirring roller displacement means, and the plate cylinder is moved to a predetermined position by the rotation driving means. By being rotated several times, the ink on the outer surface layer of the plate cylinder is kneaded with new ink supplied from the inner peripheral side of the plate cylinder by the stirring roller to be uniform.

According to the present invention, the sheet cylinder is displaced between the operating position and the standby position by the sheet displacing means immediately before or after the used master is peeled off, and the plate cylinder is rotated the predetermined number of times by the rotary driving means. By rotating the ink, the ink on the outer surface layer of the plate cylinder is kneaded with new ink supplied from the inner peripheral side of the plate cylinder and is made uniform.

According to the fifth aspect of the present invention, before or after the used master is peeled off, the heat roller is brought into contact with and separated from the outer peripheral surface of the plate cylinder by the heat roller pressing means, and the plate cylinder is rotated by the rotary drive means. By being rotated several times, the ink on the outer surface of the plate cylinder is kneaded and uniformized while being heated by the heat roller with the new ink supplied from the inner peripheral side of the plate cylinder. In addition, when the stencil printing machine is operating, the ink is hard at low temperatures, etc., and it becomes difficult for the ink to flow during "plate printing" at the time of printing, and the rise is deteriorated due to insufficient ink filling, but the ink is softened by heating the heat roller. You.

According to the sixth aspect of the present invention, before or after the used master is peeled off, the heat roller is brought into contact with or separated from the inner peripheral surface of the plate cylinder by the heat roller pressing means, and the plate cylinder is rotated by the rotary drive means. By being rotated a predetermined number of times, new ink on the inner peripheral surface layer of the plate cylinder is extruded onto the outer peripheral surface of the plate cylinder while being heated. When the next prepressed master is pressed by the pressing means after being wound around the plate cylinder, the new ink pushed out to the outer peripheral surface of the plate cylinder becomes softened ink sandwiched between the plate cylinder and the prepressed master. Is spread and diffused, whereby the heated and softened new ink and the softened ink are kneaded and homogenized. In addition, when the stencil printing machine is operating, the ink is hard at low temperatures, etc., and it becomes difficult for the ink to flow during "plate printing" at the time of printing, and the rise is deteriorated due to insufficient ink filling, but the ink is softened by heating the heat roller. You.

According to the seventh aspect of the present invention, the predetermined number of times is selected by the rotation number selecting means based on the printing time by the prepressed master or the pause time of the stencil printing machine until the next prepressed master is wound. Is done.

[0024]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 shows the configuration of a stencil printing apparatus to which an embodiment of the present invention is applied. First, the overall configuration of the stencil printing apparatus will be described.

In the figure, reference numeral K indicates a stencil printing apparatus. The stencil printing machine K includes a stencil making unit 50 arranged at the upper right in the figure to make a master (not shown) wound into a roll, and a stencil making unit 50 arranged substantially at the center in the figure of the stencil printing machine K. And a supply of ink from the inner peripheral side of the plate cylinder 1 to the outer peripheral surface layer of the plate cylinder 1 which is arranged inside the plate cylinder 1. A printing unit 60 for performing printing by providing an ink supply unit 70 for supplying the printing paper 21 arranged on the lower left side of the plate cylinder 1 and stacked on a paper feed table (not shown) to the printing unit 60. A paper unit 80 and a paper discharge unit for discharging printed paper (not shown) printed by the printing unit 60 to the paper output tray 13 at the lower right in the drawing of the plate cylinder 1 facing the paper supply unit 80 90, the plate cylinder 1 disposed between the plate making section 50 and the paper discharge section 90.
And a plate discharging unit 100 for discharging a used master (not shown) which has been peeled off from the outer peripheral surface of the printer and discarded.

Hereinafter, the plate making section 50, the printing section 60,
Each configuration of the paper feed unit 80, the paper discharge unit 90, and the plate discharge unit 100 will be sequentially described.

In FIG. 1, a plate-making section 50 is provided with a master storage means (not shown) for storing a roll-shaped master composed of a thermoplastic resin film and a porous flexible support, which is not shown. A thermal head for perforating and making a master based on image information, a platen roller for pressing the master and transporting the master to the downstream side of the master transport path, and a thermal head for cutting the master provided on the downstream side of the master transport path It has a known configuration including a cutter. On the downstream side of the master transport path of the plate making section 50, a plate-formed master 1 made by perforating plate making with a thermal head (not shown).
A pair of master feed rollers 17a and 17b for transporting the plate 9 to a clamper 8 described later, and a master guide plate 18 for guiding the plate-making master 19 are arranged.

Since the plate making section 50 has the same configuration as, for example, Japanese Patent Application No. 5-160786 already proposed by the present applicant, a detailed description thereof will be omitted. The printing unit 60 has a plate cylinder 1 around which an engraved master 19 is wound around its outer peripheral surface, and which rotates around the ink pipe 5 also serving as a rotation center axis.
An ink supply means 70 for supplying ink to the inner peripheral surface of the plate cylinder 1; a clamper 8 provided on the outer peripheral surface of the plate cylinder 1 for clamping the leading end of the plate-making master 19; The plate cylinder 1 is provided via a plate-making master 19 provided near the outer peripheral surface.
And a press roller 10 as a pressing means for pressing a printing paper (not shown) against the outer peripheral surface of the printer.

As shown in FIG. 2, the plate cylinder 1 has a support cylinder 1A having a large number of ink-permeable apertures 1a formed thereon and a mesh screen 1B wound around its outer peripheral surface.
It has a layer structure and is rotatably supported around the ink pipe 5. The plate cylinder 1 is driven to rotate clockwise and counterclockwise by a motor (not shown). A stage 9 is provided on the outer periphery of the plate cylinder 1 along the generatrix of the plate cylinder 1, and a clamper 8 is disposed on the stage 9 so as to be rotatable by a pivot 8 s parallel to the stage 9.
The clamper 8 is opened and closed at a predetermined position by opening and closing means (not shown).

The supporting cylindrical body 1A has an image area 1G in which a large number of apertures 1a are formed, and a non-image area 1H in which the apertures 1a are not formed and around the mounting portion of the clamper 8 and the stage 9. Is formed. At one end of the plate cylinder 1, a shielding plate 6 having a fan-shaped notch 6k corresponding to the angle of the non-image area 1H is attached. At a predetermined position on a side plate (not shown) near the shielding plate 6, a photo-interrupter-type sensor 7 including a light emitting element and a light receiving element (both not shown) arranged opposite to each other with the peripheral portion of the shielding plate 6 therebetween is attached. Have been. The shielding plate 6 and the sensor 7 also have a function as a rotation speed detecting unit 110 (described later) for detecting the rotation speed of the plate cylinder 1.

The ink supply means 70 is disposed inside the plate cylinder 1, is rotatably supported by a side plate (not shown) in the plate cylinder 1, and is synchronized with the plate cylinder 1 only in the direction of arrow X in the figure. An ink roller 2 that is driven to rotate, a doctor roller 3 that is provided with a slight gap from the outer surface of the ink roller 2 and forms a wedge-shaped ink reservoir 4 with the ink roller 2, and a rotation center shaft 5 And an ink pipe 5 in which a small hole 5h for supplying ink to the ink reservoir 4 is formed.

At a lower position facing the ink roller 2,
A press roller 10 is provided so as to be able to freely contact and separate from the plate cylinder 1. The press roller 10 is, by a well-known press roller displacement mechanism having a cam and a spring (not shown), a printing position where the press roller 10 is pressed against the outer peripheral surface of the plate cylinder 1 corresponding to the image area 1G of the support cylinder 1A. It is selectively displaced to a non-printing position separated from the outer peripheral surface of the plate cylinder 1 corresponding to the non-image area 1H. The press roller 10 is pressed against the plate cylinder 1 via the printing paper (not shown) when the printing paper (not shown) is fed, and continuously rotates the printing paper (not shown) while being driven and rotated. To the plate cylinder 1.

The paper feed unit 80 includes the press roller 10 and the plate cylinder 1.
, A pair of registration rollers 20a and 20b for feeding the printing paper 21 at a predetermined timing, a paper feeding roller for distributing printing paper on a paper feeding table (both not shown), and a paper feeding roller. And a separation roller for pressing and separating the printing paper into one sheet.

The paper feeding section 80 has the same configuration as, for example, Japanese Patent Application No. 5-160786 which has already been proposed by the present applicant, and a detailed description thereof will be omitted. The paper discharge unit 90 is disposed near the outer peripheral surface of the plate cylinder 1 at an obliquely upper right in the drawing of the press roller 10, and separates a peeling position for peeling a printed printing paper (not shown) and a non-peeling position separated from the peeling position. Paper ejecting nail 12 movable between
And a paper discharge tray 13 for stacking and storing printed paper (not shown) printed at 0.

The plate discharge unit 100 is disposed on the right side of the plate cylinder 1 in the drawing, and the lower plate discharge roller 15 contacts the plate cylinder 1 when the plate cylinder 1 rotates clockwise, so that a used master (not shown) is used. A pair of upper and lower discharging rollers 14 and 15 for picking up and peeling off from a rear end thereof and discarding them into a later-described plate discharging box 16 and a plate discharging box 16 for storing discarded used masters (not shown). I do. The upper and lower plate discharging rollers 14 and 15 are driven to rotate by a drive motor (not shown).

Below the lower plate discharging roller 15, the ink on the outer surface layer of the plate cylinder 1, which is fixed to a blade shaft 11a rotatably supported on a casing side plate (not shown) of the stencil printing apparatus main body, is uniformly dispersed. A blade 11 is provided as a sliding contact member which can be freely moved toward and away from the outer peripheral surface of the plate cylinder 1. The blade 11 is made of an elastic material, and is made of, for example, synthetic rubber having good ink resistance. One end of the blade 11 is formed with a sliding portion that slides on the outer peripheral surface of the plate cylinder 1, and a metal support member 40 is integrally attached to the other end. At one end of the support member 40, a solenoid 41 having a plunger 41p loosely fitted and connected via a pin 40p fixed to one side wall of the plate discharge box 16 is provided. A tension coil spring 43, one end of which is locked to the pin 40p and the other end of which is locked to a pin 42 implanted in a casing side plate (not shown), is provided between the vicinity of the outer peripheral surface of the plate cylinder 1 and the pin 40p. Is provided. In the vicinity of one end of the support member 40, a stopper 44 implanted on a casing side plate (not shown) is provided. Therefore, the blade 11 is given a habit of being displaced by the spring 43 to a non-sliding position (indicated by a solid line in the drawing) which is always separated from the outer peripheral surface of the plate cylinder 1, and the stopper 44 adjusts the displaced direction. The amount of displacement is regulated.

As described above, the sliding member displacement means 295 for selectively displacing the blade 11 between a sliding position where it slides on the outer peripheral surface of the plate cylinder 1 and a non-sliding position which is separated therefrom is provided by:
It mainly comprises a solenoid 41 and a spring 43. FIG.
2 shows a block diagram of an input / output control device and the like of the stencil printing apparatus. In the figure, reference numeral 200 denotes a central control unit. The central control unit 200 includes a CPU (central processing unit) 2
10, ROM (read only storage device) 220, RA
M230 (readable / writable storage device) and timer 240
A microcomputer having a well-known configuration in which each of these devices is connected by a signal bus is used. The central control unit 200 includes, via an I / O (input / output) interface 250, a motor drive unit 260, a pressing control unit 270 that controls the pressing operation of the press roller 10 against the outer peripheral surface of the plate cylinder 1 including its timing, Rotation number detecting means 110, sliding contact member displacement means 295, 296, which will be described later,
Heat roller displacement means 300, 301, stirring roller switching means 280, stirring roller displacement means 285, sheet displacement means 2
90, a plate discharging section 100, a plate making section 50, an operation panel section 55, and a command signal and an information signal are transmitted and received between the sheet feeding section 80,
It controls the entire system of the stencil printing machine.

The ROM 220 stores, for example, data for giving information to a rotation driving means for rotating the plate cylinder 1 a predetermined number of times while separating and discarding the used master and then moving the blade 11 toward and away from the outer peripheral surface of the plate cylinder 1. Have been. This data is determined in advance as a minimum optimal rotation number of the plate cylinder 1 necessary for the ink on the outer surface layer of the plate cylinder 1 to be mixed and uniformized with the ink supplied from the inner periphery of the plate cylinder 1. It is obtained and stored in experiments.

The ROM 220 also stores, for example, the printing time by the prepressed master 19, the downtime of the stencil printing machine until the next prepressed master is wound, the environmental temperature, the rotation speed of the plate cylinder 1, or the stirring described later. The pressing force of the roller 22 or the wound sheet 26 to the plate cylinder 1 is used as a parameter,
In order that the minimum number of rotations of the plate cylinder 1 necessary for the ink on the outer surface layer of the plate cylinder 1 to be mixed with the ink supplied from the inner periphery side of the plate cylinder 1 and be equalized can be selected in advance. It is stored as a table value obtained by an experiment or the like.

In the RAM 230, for example, the master 1
9 and the pause time of the stencil printing apparatus until the next stencil master is wound.

The timer 240 counts the printing time of the pre-printed master 19, the pause time of the stencil printing machine until the next pre-printed master is wound, and the like.

As described above, the rotation driving means for rotating the plate cylinder 1 a predetermined number of times while bringing the blade 11 into and out of contact with the outer peripheral surface of the plate cylinder 1 includes the motor driving section 260, the rotation number detecting means 110,
It mainly comprises a sliding member displacement means 295 and a central control unit 200.

Next, the operation of the stencil printing apparatus will be described below with reference to FIGS. 1, 2 and 8 according to the operation procedure.

First, a document is set on a document table of a document reading section (not shown) of the stencil printing apparatus K, and a start signal is transmitted by pressing a start key on an operation panel section (not shown). While a document is sent by a document feeder (both not shown), its optical information is converted into an electric signal by a CCD (Charge Coupled Device) or the like (not shown), and an A / D (not shown)
The digital signal is sent to the plate making unit 50 via an (analog / digital) converter. At the same time, the rotation of a motor (not shown) causes the plate cylinder 1 to rotate in the clockwise direction, and the rotation of the plate discharging upper roller 14 and the plate discharging lower roller 15 of the plate discharging section 100 causes the plate discharging lower roller 15 to contact the plate cylinder 1. A used master (not shown) is picked up from its rear end and peeled off, transferred into the plate discharging box 16 and discarded, and the plate discharging process is completed.

Next, the plate cylinder 1 starts to be rotated in the direction of the arrow X (counterclockwise) by the driving of a motor (not shown),
When one end of the shielding plate 6 comes to a position where the sensor 7 is blocked, the solenoid 41 is turned on to rotate the blade shaft 11a in a counterclockwise direction, and the blade 11 slides from a non-sliding position shown by a solid line to a sliding contact shown by an imaginary line. By causing the blade 11 to swing to the position against the urging force of the spring 43, one end of the blade 11 is brought into sliding contact with the outer peripheral surface of the plate cylinder 1 near the image area 1G with a predetermined pressing force. When the notch 6k of the shielding plate 6 comes to a position where the sensor 7 is not blocked, the solenoid 41 is turned off, and the blade 11 is displaced from the sliding contact position by the biasing force of the spring 43 displacing to the non-sliding contact position. It is displaced to the contact position. In this way, the printing cylinder 1 is rotated by the rotation driving means a predetermined number of times while the blade 11 repeats the state of contacting and separating from the outer peripheral surface of the printing cylinder 1 by the sliding member displacement means 295.

The ink supplied to the inner peripheral surface of the plate cylinder 1 by the ink roller 2 is supplied from the ink reservoir 4 by the ink roller 2 being constantly in contact with the inner peripheral surface of the plate cylinder 1 via the ink. By being stirred with the ink, its properties hardly change. However, the ink on the outer surface layer portion of the plate cylinder 1 that oozes out between a master plate (not shown) wound around the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the plate cylinder 1 is formed by a conventional technique. By receiving the pressing force of the press roller by the phenomenon described in detail, the degree of softening increases as the inner surface of the plate cylinder 1 is closer to the plate-making master (not shown).

Therefore, according to the first embodiment, after the used master (not shown) is peeled off and discarded, the sliding member displacement means 2
By rotating the plate cylinder 1 a predetermined number of times by the rotation driving means while the blade 11 repeatedly contacts and separates from the outer peripheral surface of the plate cylinder 1 with the blade 95, the ink on the outer surface layer of the plate cylinder 1 is discharged. 1. Since new ink supplied from the inner peripheral side is rubbed and mixed with the blade 11 and made uniform, there is an advantage that occurrence of a ghost phenomenon can be prevented.

Next, the plate cylinder 1 is stopped at the plate feeding position where the clamper 8 is located almost directly above the plate cylinder 1, and the clamper 8 is opened by opening / closing means (not shown). At about the same time, the leading end of the master 19 is fed by the master feed roller pair 17a, 17b from the master making section 50, and the master guide plate 18 is moved.
When it is determined that the sheet has reached between the expanding stage 9 and the clamper 8 by the number of steps of a stepping motor (not shown) of a platen roller (not shown), the opening / closing means (not shown) The clamper 8 is closed.

When the leading end of the prepressed master (not shown) is clamped between the stage 9 and the clamper 8 in this manner, the plate cylinder 1 moves in the direction of arrow X (counterclockwise) in the figure. Then, the master 19 is wound around the outer peripheral surface of the plate cylinder 1 at a peripheral speed substantially equal to the transport speed of the plate cylinder 1. When the number of steps of a stepping motor (not shown) reaches a predetermined number, a cutter (not shown) of the plate making section 50 operates to cut the rear end of the plate-making master 19. At the same time, the rotation of the platen roller and the master feed roller pair 17a, 17b of the plate making unit 50 (not shown) is stopped.

When the plate making and plate supplying steps in the plate making section 50 are completed, a so-called "plate making" step and a printing step are started. First, only one of the printing papers 21 is separated and fed from the paper feeding unit 80, and is fed toward the pair of registration rollers 20a and 20b. The conveyed printing paper 21 is inserted between the plate cylinder 1 and the press roller 10 at a predetermined timing synchronized with the rotation of the plate cylinder 1 by the pair of registration rollers 20a and 20b. Then, at a predetermined timing, the press roller 10 which has been separated from the outer peripheral surface of the plate cylinder 1 is raised to a position indicated by a virtual line. Then, when the printing paper 21 is pressed against a plate-making master (not shown) wound around the outer peripheral surface of the plate cylinder 1 rotating in the direction of the arrow X, the ink is made from the opening 1a of the plate cylinder 1 through the plate making. Completed master (not shown)
The ink passes through the perforated portion while exuding, and the ink is transferred to the surface of the printing paper to form a printed image. At this time, the ink roller 2 also rotates in the same direction as the rotation direction of the plate cylinder 1,
Ink is supplied to the inner peripheral surface of the plate cylinder 1.

The printed paper (not shown) is conveyed while being pressed by the plate cylinder 1 and the press roller 10, is separated from the outer peripheral surface of the plate cylinder 1 by the separation claw 12, and is discharged to the paper discharge tray 13. Then, the printing of the first sheet, the so-called "printing" is completed, and the apparatus enters a print standby state. Next, a predetermined number of prints are sequentially and continuously performed by the same operation as the above operation.

(Embodiment 2) FIG. 3 shows another embodiment 2.
The second embodiment differs from the stencil printing apparatus K of the first embodiment only in the following points. That is, the blade 11
Is fixed to a blade shaft 11a which is disposed in the plate cylinder 1 and is rotatably supported by an ink roller side plate (not shown). In order to make the ink on the inner peripheral surface layer of the plate cylinder 1 uniform,
It is provided so as to be able to freely contact and separate from the inner peripheral surface of the plate cylinder 1, that the solenoid 41 is fixed to an ink roller side plate (not shown), and that the tension cylinder 43 is replaced with the tension spring 43 of the first embodiment. A compression coil spring 45 that gives a habit of displacing to a non-sliding contact position (shown by a solid line in the drawing) separated from the inner peripheral surface.
The only difference is that the stopper 44i provided on the ink side plate (not shown) is provided near one end of the support member 40. As mentioned above,
In the second embodiment, the blade 11 is selectively displaced to a sliding position (shown by a virtual line in the drawing) where the blade 11 slides on the inner peripheral surface of the plate cylinder 1 and a non-sliding position (shown by a solid line in the drawing) away from the sliding position. The sliding member displacement means 296 to be made is mainly composed of the solenoid 41 and the spring 45. In the second embodiment, the rotation driving unit that rotates the plate cylinder 1 a predetermined number of times while moving the blade 11 toward and away from the inner peripheral surface of the plate cylinder 1 includes a motor driving unit 260,
It is mainly composed of the rotation number detecting means 110, the sliding member displacement means 296 and the central control unit 200.

Next, only the operation of the second embodiment that is different from that of the first embodiment will be described. After the plate discharging process, the plate cylinder 1 starts to be rotated in the direction of arrow X (counterclockwise) by the drive of a motor (not shown), and when one end of the shielding plate 6 comes to a position where the sensor 7 is blocked, the solenoid 41 is turned on. By rotating the blade shaft 11a in the clockwise direction and swinging the blade 11 from the non-sliding position to the sliding position against the urging force of the spring 45, one end of the blade 11 is moved inside the plate cylinder 1. It is slid on the peripheral surface with a predetermined pressing force. As a result, new ink on the inner peripheral surface layer of the plate cylinder 1 supplied by the ink roller 2 is extruded onto the outer peripheral surface of the plate cylinder 1. When the notch 6k of the shielding plate 6 reaches a position where the sensor 7 is not blocked, the solenoid 41 is turned off, and the blade 1 is biased by the biasing force of the spring 45 displaced to the non-sliding position.
1 is displaced from the sliding position to the non-sliding position. In this manner, the plate cylinder 1 is rotated a predetermined number of times by the rotation drive unit while the blade 11 repeats the state of separation and contact with the inner peripheral surface of the plate cylinder 1 by the sliding member displacement unit 296.

By the above operation, new ink supplied from the ink roller 2 on the inner peripheral surface of the plate cylinder 1 is removed.
The operation of being pushed out to the outer peripheral surface of is repeated. After the next plate-making master (not shown) is wound around the plate cylinder 1 and pressed by the press roller 10 (not shown in FIG. 3) via the printing paper (not shown), the plate cylinder 1 The new ink extruded on the outer peripheral surface is used for the plate cylinder 1 and the plate-making master (not shown).
And the softened ink sandwiched between the plate cylinder 1 and the prepressed master (not shown) is spread and diffused, so that the new ink and the softened ink are separated. It is mixed and homogenized.

Therefore, according to the second embodiment, there is an advantage that occurrence of a ghost phenomenon can be reduced. In addition, a large amount of ink adheres to the used master (not shown) when the used master (not shown) is peeled and discarded (discharged), and a large amount of ink is removed. Since a large amount of ink is extruded and replenished to the outer peripheral surface of the plate cylinder 1 by the blade 11, there is an advantage that the rising of the printing operation is improved without running out of ink. Insufficient ink causes unevenness in image density of printing and a phenomenon commonly referred to as a perforation in which a punched hole in the opening 1a of the plate cylinder 1 appears in an image, resulting in poor start-up.

(Embodiment 3) FIG. 4 shows another embodiment 3.
The third embodiment differs from the stencil printing apparatus K of the first embodiment only in that the blade 11, the sliding member displacement unit 295, the rotation driving unit, the shielding plate 6, and the sensor 7 are deleted and the configuration described below is added. Are different. That is, the printing apparatus is provided with a stirring roller 22 which can be switched with the press roller 10 and which is capable of coming into contact with and separating from the outer peripheral surface of the plate cylinder 1 in order to make the ink on the outer peripheral surface of the plate cylinder 1 uniform. After the used master (not shown) is peeled and discarded, the stirring roller 22 is moved to the plate cylinder 1.
Agitating roller displacing means 285 for selectively displacing a press-contact position for pressing against the outer peripheral surface of the plate and a non-press-contact position separated from the press-contact position, a printing time by a pre-made master (not shown), or a next pre-made master ( After the used master (not shown) is peeled off and discarded by the idle time of the stencil printing apparatus until the stencil printing machine is wound, the stirring roller 22 is moved to the plate cylinder 1.
And a rotation driving means for rotating the plate cylinder 1 a predetermined number of times while coming into contact with and separating from the outer peripheral surface of the plate cylinder. Hereinafter, each configuration of the stirring roller 22, the stirring roller displacement unit 285, and the rotation driving unit will be described in detail.

At a position below the plate cylinder 1 facing the ink roller 2, a press roller 10 and a stirring roller 22 are provided.
And are arranged so that they can be freely separated from each other. Press roller 1
The agitating roller 22 and the agitating roller 22 are made of synthetic rubber having the same diameter with good ink resistance, and are provided at each end of an agitating roller arm 25 disposed below both ends of the plate cylinder 1 with an agitating roller arm shaft 22a and a press. Each is rotatably supported via a roller shaft 10a. The press roller 10 is on the press roller shaft 10a, and the stirring roller 22 is on the stirring roller arm shaft 2.
2a. Each stirring roller arm 2
Each end of the stirring roller arm shaft 25a is fixedly provided at the center of the outside of the shaft 5. A press roller arm shaft 24 rotatably supported by a housing side plate (not shown) is provided on the left side of the both stirring roller arms 25 in the drawing, and a press roller is provided at each end of the press roller arm shaft 24. One end of each arm 23 is fixedly provided. Each other end of the press roller arm 23 is connected to a stirring roller arm shaft 25.
a is rotatably supported at each end. One end of the stirring roller arm shaft 25a is connected to an output shaft of a stepping motor M1 fixed to a casing side plate (not shown), and the rotation of the stepping motor M1 causes the stirring roller arm shaft 25a and the two stirring roller arms 25 to rotate. Rotated.
One end of the central portion of the stirring roller arm 25 has a shielding piece 25
t are formed integrally, while the press roller arm 23
A through hole 23h is formed at a predetermined position to engage with the shielding piece 25t. Through hole 23 of press roller arm 23
h and a shielding piece 25t, a photo-interrupter comprising a light-emitting element and a light-receiving element for detecting the positions of the press roller 10 and the stirring roller 22, which are fixed to a housing side plate (not shown), respectively. Type sensors (both not shown) are provided. Therefore, the press roller 10 and the stirring roller 22 are connected to the stepping motor M1.
The position of each roller is detected by roller switching means 280 mainly composed of the above-mentioned sensor (not shown), and each roller is rotated by 180 °, so that the lower part of the outer peripheral surface of the plate cylinder 1 facing the ink roller 2 is detected. The position of each roller can be switched up and down.

A cam (not shown) provided in sliding contact with a substantially upper portion of the center of the press roller arm 23, and the press roller 1
The press roller 10 is pressed by a well-known press roller displacement mechanism provided with a tension coil spring (not shown) that urges the agitating roller 22 and the agitating roller 22 in a direction of pressing the outer peripheral surface of the plate cylinder 1.
Corresponds to the printing position of pressing the outer peripheral surface of the plate cylinder 1 corresponding to the image area 1G (shown in FIG. 1) of the support cylinder 1A and the non-image area 1H (shown in FIG. 1) of the support cylinder 1A. It is selectively displaced to a non-printing position separated from the outer peripheral surface of the plate cylinder 1. Similarly, the stirring roller 22 is pressed by the same stirring roller displacement means 285 as the press roller displacement mechanism to press against the outer peripheral surface of the plate cylinder 1 corresponding to the image area 1G (shown in FIG. 1) of the support cylinder 1A. Position (indicated by a virtual line in the figure)
And a non-pressing position (shown by a solid line in the figure) separated from the outer peripheral surface of the plate cylinder 1 corresponding to the non-image area 1H (shown in FIG. 1) of the support cylinder 1A. Both ends of the stirring roller arm 25 are loosely supported by guide members (not shown) for guiding the vertical displacement in the figure.

As described above, the stirring roller displacement means 285
Also serves as a press roller displacement mechanism. Further, in the third embodiment, the rotation driving means is
0, rotation number detecting means 110, stirring roller displacement means 285
And a central control unit 200.

Next, differences between the operation of the third embodiment and the operation of the first embodiment will be described. After the plate removal process,
The rotation of the stepping motor M1 rotates the stirring roller arm shaft 25a by 180 °, and it is detected that the stirring roller 22 has occupied the non-pressing position indicated by the solid line in the drawing by a known light-shielding detection operation of a sensor (not shown). Next, the plate cylinder 1 starts to be rotated in the direction of the arrow X (counterclockwise) by the driving of a motor (not shown), and one side end of the image area 1G (shown in FIG. When it comes to the contact position, the stirring roller displacement means 285 operates to rotate the press roller arm shaft 24 in the counterclockwise direction, and the stirring roller 22 is pressed against the outer peripheral surface of the plate cylinder 1 to occupy the pressing position. 22 is driven and rotated by the rotation of the plate cylinder 1. Then, in the range of the non-image area 1H (shown in FIG. 1) of the plate cylinder 1, the stirring roller displacement means 285 operates to rotate the press roller arm shaft 24 clockwise,
The stirring roller 22 occupies a non-pressing position separated from the outer peripheral surface of the plate cylinder 1. In this way, the printing drum 1 is rotated a predetermined number of times by the rotation driving means while the stirring roller 22 repeatedly contacts and separates from the outer peripheral surface of the printing drum 1 by the stirring roller displacement means 285.

After the predetermined number of rotations of the plate cylinder 1 is completed, the stirring roller displacement means 285 causes the press roller arm shaft 2 to rotate.
4 is rotated clockwise, the stirring roller 22 is separated from the outer peripheral surface of the plate cylinder 1 to occupy the non-pressing position, and then the stirring roller arm shaft 25a is rotated by 180 ° by the rotation drive of the stepping motor M1, and the press is performed. The positions of the roller 10 and the stirring roller 22 are reversed and exchanged. The reversal end state is determined by a well-known non-light-shielding detection operation of a sensor (not shown) by not blocking the through hole 23h with the shielding piece 25t (the non-pressing position of the stirring roller 22 indicated by a solid line in FIG. 4). Position) is detected. Next, the same steps as in the first embodiment are performed.

When the stencil printing apparatus is left for a long period of time, for example, when an emulsion ink or the like is used as a printing ink, the water evaporates, and the ink on the outer surface layer of the plate cylinder 1 is removed. Softens.
In particular, a large amount of ink is accumulated between the opening 1a of the plate cylinder 1 (shown in FIG. 2) and the non-perforated portion of the plate-making master.
When the pre-printed master (used master) is discharged and the next pre-printed master is wound and printing is performed, a large amount of the ink is softened and the ink permeability is improved. Therefore, when printing is performed on the outer circumferential portion of the plate cylinder 1 whose softness has been improved and the ink passage property is improved, even if the perforations are the same size, they are supplied to the inner circumferential surface of the plate cylinder 1 by the ink roller 2. A larger amount of ink is more likely to be produced than a new ordinary ink, and the difference in image density in printing becomes larger, and the ghost phenomenon becomes more remarkable. Therefore, according to the third embodiment, after the used master is peeled off and discarded, the stirring roller 22 is brought into contact with and separated from the outer peripheral surface of the plate cylinder 1 by the stirring roller displacing means, and the plate cylinder 1 is rotated a predetermined number of times by the rotation driving means. As a result, the ink on the outer surface layer of the plate cylinder 1 becomes
Since new ink supplied from the inner peripheral side of the plate cylinder 1 is kneaded and uniformized by the stirring roller 22, there is an advantage that occurrence of a ghost phenomenon can be prevented.

(Embodiment 4) FIG. 5 shows another embodiment 4.
The fourth embodiment differs from the stencil printing apparatus K of the first embodiment only in that the blade 11, the sliding member displacing means 295, the rotation driving means, the shielding plate 6 and the sensor 7 are omitted and the following construction is added. Are different. That is, the stencil printing apparatus has an operation position (shown by a virtual line in the figure) inserted between the press roller 10 and the plate cylinder 1 and a standby position (in the figure) retracted from the operation position to the outside of the printing paper transport path. (Indicated by a solid line).
And a sheet displacement means 290 for selectively displacing the wound sheet 26 between the operating position and the standby position after peeling and discarding the used master (not shown), and a used master (not shown)
After peeling and discarding, the rolled sheet 26 is provided with rotation driving means for rotating the plate cylinder 1 a predetermined number of times while repeatedly displacing between the operating position and the standby position.
Hereinafter, each configuration of the wound sheet 26, the sheet displacement means 290, and the rotation drive means will be described in detail.

The wound sheet 26 is formed by a pair of registration rollers 20.
A guide portion 27g for conveying printing paper (not shown) is formed on the upper portion between the a and 20b and the press roller 10, and is rotated by a cochlear case 27 fixed to a housing side plate (not shown). One end thereof is attached to a freely supported wound sheet shaft 26a, and is provided wound in a cochlea shape. A stepping motor M2 is connected to the wound sheet shaft 26a. When the wound sheet 26 occupies the standby position, the leading end on the other end side of the wound sheet 26 is the guide portion 2.
It is configured to be stored in the case 27 so as to be hidden inside 7 g. The wound sheet 26 is made of, for example, a flexible material made of a synthetic resin having good ink resistance.

As described above, in the fourth embodiment, the sheet displacement means 290 is constituted by the stepping motor M2. In the fourth embodiment, the rotation driving unit mainly includes the motor driving unit 260, the rotation speed detection unit 110, the sheet displacement unit 290, and the central control unit 200.

Next, differences between the operation of the fourth embodiment and the operation of the first embodiment will be described. After the plate removal process,
The wound sheet shaft 26a is rotated by the rotational drive of the stepping motor M2, the leading end of the wound sheet 26 is sent out to the operating position between the plate cylinder 1 and the press roller 10, and the rotational drive of the stepping motor M2 stops. . Then
The plate cylinder 1 starts to be rotated in the arrow X direction (counterclockwise direction) by the driving of a motor (not shown), and the image area 1G of the plate cylinder 1
When one side end (shown in FIG. 1) comes to the lower contact position of the ink roller 2, the press roller 10 is raised by the press roller displacement mechanism to occupy the printing position indicated by the imaginary line in FIG. Press roller 10 on the outer peripheral surface of plate cylinder 1
Is pressed. In the range of the non-image area 1H (shown in FIG. 1) of the plate cylinder 1, the press roller 10 is lowered by the press roller displacement mechanism to occupy the non-printing position separated from the outer peripheral surface of the plate cylinder 1, and the wound sheet 26 is displaced from the operating position to the standby position by the rotation of the stepping motor M2 in the reverse direction. Thus, the sheet displacement means 29
When the wound sheet 26 is displaced between the operating position and the standby position by 0, the plate cylinder 1 is rotated a predetermined number of times by the rotation driving means. Next, the same steps as in the first embodiment are performed.

As described above, according to the fourth embodiment, as in the third embodiment, the ink on the outer surface layer of the plate cylinder 1 is kneaded with new ink supplied from the inner peripheral side of the plate cylinder 1 to make it uniform. Therefore, there is an advantage that occurrence of a ghost phenomenon can be prevented.

(Embodiment 5) FIG. 6 shows still another embodiment 5. The fifth embodiment is different from the stencil printing apparatus K of the first embodiment only in that the blade 11, the sliding member displacement unit 295, and the rotation driving unit are deleted and the configuration described below is added. That is, the stencil printing apparatus uses a heat roller 28 as a heat roller that can freely contact and separate from the outer peripheral surface of the plate cylinder 1 for heating and uniformizing the ink on the outer surface layer of the plate cylinder 1. After peeling and discarding the finished master (not shown), the heat roller 28 is pressed against the outer peripheral surface of the plate cylinder 1 (indicated by an imaginary line in the figure) and a non-pressed position (solid line in FIG. ) And a used master (not shown).
And a rotation driving means for rotating the plate cylinder 1 a predetermined number of times while bringing the heat roller 28 into and out of contact with the outer peripheral surface of the plate cylinder 1 after peeling and discarding. Hereinafter, each configuration of the heat roller 28, the heat roller displacement unit 300, and the rotation driving unit will be described in detail.

A pair of heat roller holders 30 fixed to each end of a heat roller drive shaft 31 rotatably supported by a casing side plate (not shown) of the stencil printing apparatus main body below the stencil lower roller 15. A heat roller 28 is rotatably supported at one end of the heat roller holder 30 via a heat roller shaft 28a. At the other end of the heat roller holder 30, a solenoid 41 having a plunger 41p loosely fitted and connected via a pin 30p fixed to one side wall of the plate discharge box 16 and planted in the heat roller holder 30 is provided. Is provided.

The heat roller 28 has a built-in electric heating element therein, and power is supplied from a power supply (not shown) by a heater cord 29 connected to the electric heating element. The heat roller 28 is controlled by a bimetal or a thermal sensor (not shown) so as to reach a predetermined heating temperature. The heat roller 28 is made of, for example, synthetic rubber having good heat resistance. Near the outer peripheral surface of plate cylinder 1 and pin 3
A tension coil spring 43, one end of which is locked to the pin 30p and the other end of which is locked to a pin 42 implanted in a casing side plate (not shown), is provided between the tension coil spring 43 and 0p. In the vicinity of one end of the heat roller holder 30, a stopper 44 implanted on a casing side plate (not shown) is provided. As the heat roller, the heat roller 2 of Example 5 was used.
The configuration is not limited to 8, and may be, for example, a configuration equivalent to a heat fixing roller of a copying machine or the like.

As described above, the heat roller displacement means 300
Is mainly composed of a solenoid 41 and a spring 43, like the sliding member displacement means of the first embodiment. Example 5
In, the rotation driving means mainly includes a motor driving section 260, a rotation speed detection means 110, a heat roller displacement means 300, and a central control section 200. Next, only the operation of the fifth embodiment that is different from the operation of the first embodiment will be described. After the plate discharging process, the plate cylinder 1 starts to be rotated in the direction of arrow X (counterclockwise) by the drive of a motor (not shown), and when one end of the shielding plate 6 comes to a position where the sensor 7 is blocked, the solenoid 41 is turned on. By rotating the heat roller holder 30 in a counterclockwise direction and swingingly displacing the heat roller 28 from the non-pressing position to the pressing position against the urging force of the spring 43, the heat roller 28 becomes a plate near the image area 1G. It is pressed against the outer peripheral surface of the body 1 with a predetermined pressing force. At this time,
The heat roller 28 is supplied with electric power from a power supply unit (not shown) and is heated to a predetermined heating temperature. When the notch 6k of the shielding plate 6 comes to a position where it does not block the sensor 7,
The solenoid 41 is turned off, and the heat roller 28 is displaced from the pressed position to the non-pressed position by the biasing force of the spring 43 displaced to the non-pressed position. Thus, the heat roller displacement means 3
00, the plate cylinder 1 is rotated a predetermined number of times by the rotation driving means while the heat roller 28 repeatedly contacts and separates from the outer peripheral surface of the plate cylinder 1. Next, the same steps as in the first embodiment are performed.

Therefore, according to the fifth embodiment, after the used master (not shown) is peeled off and discarded, the heat roller displacement means 3
00, the heat roller 28 is brought into contact with and separated from the outer peripheral surface of the plate cylinder 1, and the rotation driving means rotates the plate cylinder 1 a predetermined number of times. The new hard ink supplied from the peripheral side is kneaded and uniformized while being heated by the heat roller 28, so that there is an advantage that occurrence of a ghost phenomenon can be prevented. In addition, when the stencil printing machine is operated, the ink is hard at a low temperature or the like, and it becomes difficult for the ink to flow at the time of "plate printing" at the time of printing, and the rising is deteriorated due to insufficient ink filling, but the ink is softened by heating the heat roller 28. Is done.

(Embodiment 6) FIG. 7 shows still another embodiment 6. The sixth embodiment differs from the stencil printing apparatus of the fifth embodiment only in the following points. That is, the heat roller 28 is provided so as to be able to freely contact and separate from the inner peripheral surface of the plate cylinder 1 in order to uniform the ink on the inner peripheral surface layer of the plate cylinder 1. In place of the tension spring 43 of the fifth embodiment, the behavior of displacing the heat roller 28 to a non-pressing position (indicated by a solid line in the drawing) away from the inner peripheral surface of the plate cylinder 1. The only difference is that a compression coil spring 45 that provides the following is provided on the plunger 41p, and a stopper 44i implanted on an ink side plate (not shown) is provided near one end of the heat roller holder 30. The heat roller 28 is provided at one end of a heat roller holder 30 fixed to a heat roller drive shaft 31a disposed in the plate cylinder 1 and rotatably supported by an ink roller side plate (not shown) via a heat roller shaft 28a. It is rotatably supported.

As described above, in the sixth embodiment, the pressing position where the heat roller 28 is pressed against the inner peripheral surface of the plate cylinder 1 (shown by a virtual line in the drawing) and the non-pressing position separated from the pressing position (shown by a solid line in the drawing) Heat roller displacement means 3 for selectively displacing the heat roller
Reference numeral 01 mainly includes a solenoid 41 and a spring 45. Further, in the sixth embodiment, after the used master (not shown) is peeled off and discarded, the rotation driving means for rotating the plate cylinder 1 a predetermined number of times while bringing the heat roller 28 into contact with and separating from the inner peripheral surface of the plate cylinder 1 is a motor. It mainly includes a driving unit 260, a rotation speed detecting unit 110, a heat roller displacement unit 301, and a central control unit 200.

Next, only the operation of the sixth embodiment that is different from the operation of the fifth embodiment will be described. After the plate discharging process, the plate cylinder 1 starts to be rotated in the direction of arrow X (counterclockwise) by the drive of a motor (not shown), and when one end of the shielding plate 6 comes to a position where the sensor 7 is blocked, the solenoid 41 is turned on. By rotating the heat roller holder 30 in the counterclockwise direction and swinging the heat roller 28 from the non-pressing position to the pressing position against the urging force of the spring 45, the heat roller 28 is moved to the image area 1G (FIG. 1). (Shown in FIG. 3) is pressed against the outer peripheral surface of the nearby plate cylinder 1 with a predetermined pressing force. At this time, the heat roller 28 is supplied with electric power from a power supply unit (not shown) and is heated to a predetermined heating temperature. And the shielding plate 6
When the notch 6k is located at a position where the sensor 7 is not blocked, the solenoid 41 is turned off, and the heat roller 28 is displaced from the pressed position to the non-pressed position by the biasing force of the spring 45 displaced to the non-pressed position. Thus, the heat roller displacement means 301
While the heat roller 28 repeatedly contacts and separates from the inner peripheral surface of the plate cylinder 1, the plate cylinder 1 is rotated a predetermined number of times by the rotation driving means.

Therefore, according to the sixth embodiment, after the used master (not shown) is peeled off and discarded, the heat roller displacement means 3
01, the heat roller 28 is brought into contact with and separated from the inner peripheral surface of the plate cylinder 1 while the rotation driving means rotates the plate cylinder 1 a predetermined number of times, so that new ink on the inner peripheral surface of the plate cylinder 1 is heated. While being extruded onto the outer peripheral surface of the plate cylinder 1. When the next prepressed master (not shown) is pressed by the press roller 10 (not shown in FIG. 7) after being wound around the plate cylinder 1, the new ink pushed out to the outer peripheral surface of the plate cylinder 1 The softened ink sandwiched between the cylinder 1 and the plate-making master (not shown) is pushed and spread to diffuse, so that the heated and softened new ink and the softened ink are kneaded and uniformized. Therefore, there is an advantage that occurrence of a ghost phenomenon can be prevented. In addition, when the stencil printing machine is operated, the ink is hard at low temperatures, etc., and it becomes difficult for the ink to flow during "plate printing" at the time of plate formation, and the rise is deteriorated due to insufficient ink filling. However, the ink is softened by heating the heat roller. Therefore, there is an advantage that the rise of the stencil printing apparatus is also improved.

In the third and fourth embodiments, instead of the rotation driving means, the printing cylinder or the stencil printing machine is stopped until the next master is wound. A number-of-rotations selection means for selecting the number of rotations to be pressed may be provided. That is, it is stored as a table value in the ROM 220 based on the printing time of the stencil master measured by the timer 240 of the central control unit 200, the pause time of the stencil printing machine until the next stencil master is wound, and the like. The number of rotations for rotating the printing cylinder 1 a predetermined number of times is selected, and while the stirring roller 22 is in contact with or separated from the outer peripheral surface of the printing cylinder 1 or the wound sheet 26 is displaced between the operating position and the standby position, the printing cylinder 1 is rotated. Is rotated by the selected number of rotations. As described above, the rotation number selection unit mainly includes the motor driving unit 260, the rotation number detection unit 110, the stirring roller switching unit 280 and the stirring roller displacement unit 285, or the sheet displacement unit 290 and the central control unit 200. By providing the rotation speed selecting means in this manner, new ink supplied from the inner peripheral side of the plate cylinder 1 is filled into the outer peripheral surface portion of the plate cylinder 1 with the least waste, and is kneaded and stirred with the least waste. Therefore, there is an advantage that a printed matter having a good rise can be obtained without occurrence of a ghost phenomenon.

Further, in the first, second, fifth and sixth embodiments, similarly, the printing time of the stencil master or the pause time of the stencil printing machine until the next stencil master is wound in place of the rotary driving means. Accordingly, a rotation number selecting means for selecting the rotation number to be pressed against the plate cylinder 1 may be provided.

In the first, third, and fourth embodiments, the operation of each member, each displacement unit, each rotation drive unit, and the like is started after the used master (not shown) is peeled and discarded. However, the present invention is not limited to this, and may be performed after the completion of the used master separation. The method of separating the used master (method of separating the used master from the front end portion or the rear end portion thereof) may be used. Since there are various types, it may be just before the used master is peeled off, that is, while the used master is being peeled off.

In the second, fifth or sixth embodiment, after the used master is separated and discarded, the blade 11 is placed on the inner peripheral surface of the plate cylinder 1 or the heat roller 28 is placed on the outer peripheral surface or the inner peripheral surface of the plate cylinder 1. However, the present invention is not limited to this, and these operations are performed while the used master is wound, and thereafter, the used master is peeled and discarded (discharge).
Then, the next plate-making master may be wound.

[0082]

As described above, according to the first aspect of the present invention, the sliding member is brought into contact with or separated from the outer peripheral surface of the plate cylinder by the sliding member displacement means immediately before or after the used master is peeled off. Meanwhile, by rotating the plate cylinder a predetermined number of times by the rotation driving means, the ink on the outer surface layer of the plate cylinder is rubbed and mixed with new ink supplied from the inner peripheral side of the plate cylinder by a sliding contact member, thereby making it uniform. Therefore, occurrence of a ghost phenomenon can be prevented.

According to the second aspect of the present invention, before or after the used master is peeled off, the sliding contact member is moved toward and away from the inner peripheral surface of the plate cylinder by the sliding member displacement means, and the plate is rotated by the rotation driving means. By rotating the cylinder a predetermined number of times, new ink on the inner peripheral surface of the plate cylinder is pushed out to the outer peripheral surface of the plate cylinder. When the next prepressed master is pressed by the pressing means after being wound around the plate cylinder, the new ink pushed out to the outer peripheral surface of the plate cylinder becomes softened ink sandwiched between the plate cylinder and the prepressed master. Is spread and diffused, the new ink and the softened ink are mixed and uniformized, so that the occurrence of the ghost phenomenon can be reduced.

Further, a large amount of ink adheres to the used master when the used master is peeled off and discarded (discharged), and a large amount of ink is removed. Is extruded and replenished to the outer surface layer of the plate cylinder, so that the rise is good without running out of ink.

According to the third aspect of the present invention, immediately before or after the used master is peeled off, the stirring roller is brought into contact with and separated from the outer peripheral surface of the plate cylinder by the stirring roller displacement means, while the rotation of the plate cylinder by the rotation driving means. By rotating the ink several times, the ink on the outer surface layer of the plate cylinder is kneaded with new ink supplied from the inner peripheral side of the plate cylinder by the stirring roller to be uniform, so that the occurrence of the ghost phenomenon can be prevented.

According to the fourth aspect of the invention, immediately before or after the used master is peeled off, the sheet cylinder is displaced between the operating position and the standby position by the sheet displacing means, and the plate cylinder is rotated the predetermined number of times by the rotary driving means. By rotating the ink, the ink on the outer surface layer of the plate cylinder is kneaded with new ink supplied from the inner peripheral side of the plate cylinder to be uniform, so that the occurrence of a ghost phenomenon can be prevented.

According to the fifth aspect of the present invention, before or after the used master is peeled off, the heat roller is brought into contact with and separated from the outer peripheral surface of the plate cylinder by the heat roller press-contact means, and the plate cylinder is rotated by the rotary drive means. By rotating the ink several times, the ink on the outer surface layer of the plate cylinder is kneaded and homogenized while being heated by the heat roller with new ink supplied from the inner periphery of the plate cylinder, thereby preventing the occurrence of a ghost phenomenon. it can. In addition, when the stencil printing machine is operating, the ink is hard at low temperatures, etc., and it becomes difficult for the ink to flow during "plate printing" at the time of printing, and the rise is deteriorated due to insufficient ink filling, but the ink is softened by heating the heat roller. Therefore, a printed matter with a good rise can be obtained.

According to the sixth aspect of the present invention, before or after the used master is peeled off, the heat roller is brought into contact with or separated from the inner peripheral surface of the plate cylinder by the heat roller pressing means, and the plate cylinder is rotated by the rotary drive means. By being rotated a predetermined number of times, new ink on the inner peripheral surface layer of the plate cylinder is extruded onto the outer peripheral surface of the plate cylinder while being heated. When the next prepressed master is pressed by the pressing means after being wound around the plate cylinder, the new ink pushed out to the outer peripheral surface of the plate cylinder becomes softened ink sandwiched between the plate cylinder and the prepressed master. Is spread and diffused, the heated and softened new ink and the softened ink are kneaded and uniformized, so that the occurrence of a ghost phenomenon can be prevented. In addition, when the stencil printing machine is operating, the ink is hard at low temperatures, etc., and it becomes difficult for the ink to flow during "plate printing" at the time of printing, and the rise is deteriorated due to insufficient ink filling, but the ink is softened by heating the heat roller. Therefore, a printed matter with a good rise can be obtained.

According to the seventh aspect of the present invention, the predetermined number of times is selected by the number of revolutions selecting means based on the printing time by the pre-made master or the pause time of the stencil printing machine until the next pre-made master is wound. As a result, new ink supplied from the inner peripheral side of the plate cylinder is filled in the outermost surface layer of the plate cylinder with the least waste, and is kneaded and agitated most efficiently without waste. Thus, a printed matter with a good rise can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an entire configuration of a stencil printing apparatus according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing around a sliding member displacement means of FIG. 1;

FIG. 3 is a side view of a main part showing a configuration of a second embodiment.

FIG. 4 is a side view of a main part showing a configuration of a third embodiment.

FIG. 5 is a side view of a main part showing a configuration of a fourth embodiment.

FIG. 6 is a side view of a main part showing a configuration of a fifth embodiment.

FIG. 7 is a side view of a main part showing a configuration of a sixth embodiment.

FIG. 8 is a block diagram showing control contents of the present invention.

FIG. 9 is a diagram for explaining a state of occurrence of a ghost image according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate cylinder 10 Press roller as a pressing means 11 Blade as a sliding member 19 Plate-made master 41 Solenoid which constitutes a sliding member displacement means 43 Tension coil spring which constitutes a sliding contact member displacement means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41L 13/00-13/18 B41F 31/00-31/38

Claims (7)

(57) [Claims] 1. A perforated plate-making master is wound around the outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from the inner peripheral side of the plate cylinder, and the plate cylinder is passed through the plate-made master. The printing paper is pressed against the printing paper by a pressing means, and the ink exuding through the perforated portion of the plate-making master is transferred to the printing paper to perform printing, and after the printing, the used master is peeled from the plate cylinder. In the stencil printing machine for discarding, in order to equalize the ink on the outer peripheral surface layer of the plate cylinder, a sliding contact member which can freely contact and separate from the outer peripheral surface, immediately before or after peeling the used master, Sliding contact member displacement means for selectively displacing the sliding contact member to a sliding contact position for sliding contact with the outer peripheral surface and a non-sliding contact position separated from the sliding contact position; and immediately before or after peeling the used master , The sliding member on the outer peripheral surface Stencil printing apparatus characterized by comprising a rotation drive means for rotating a predetermined number of times the plate cylinder while away. 2. A perforated plate-made master is wound around the outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from the inner peripheral side of the plate cylinder, and the plate cylinder is passed through the plate-made master. The printing paper is pressed against the printing paper by a pressing means to transfer the ink oozed through the perforated portion of the prepressed master to the printing paper for printing, and after the printing, the used master is peeled from the plate cylinder. In the stencil printing machine, the used master is peeled off from a sliding contact member which is capable of coming into contact with and separating from the inner peripheral surface of the plate cylinder in order to make the ink on the inner peripheral surface of the plate cylinder uniform. Before or after, the sliding master displacing means for selectively displacing the sliding contact member to a sliding contact position for slidingly contacting the inner peripheral surface and a non-sliding contact position separated from the sliding contact position; Before or after peeling off the sliding member, the inner peripheral surface Contact away while the stencil printing apparatus characterized by comprising a rotation drive means for a predetermined number of times rotating the plate cylinder. 3. A perforated plate-making master is wound around an outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from an inner peripheral side of said plate cylinder, and said plate cylinder is passed through said plate-making master. The printing paper is pressed against the printing paper by a pressing means to transfer the ink oozed through the perforated portion of the prepressed master to the printing paper for printing, and after the printing, the used master is peeled from the plate cylinder. A stencil roller which is switchable with the pressing means and which is capable of contacting and separating with the outer peripheral surface for uniformizing the ink on the outer peripheral surface layer of the plate cylinder; Immediately before or after peeling off the used master, a stirring roller displacing means for selectively displacing a pressing position for pressing the stirring roller against the outer peripheral surface and a non-pressing position separated from the pressing position, and peeling the used master Just before Ku then stencil printing apparatus characterized by comprising a rotation drive means for a predetermined number of times rotating the plate cylinder while the stirring roller into contact or away from the said outer peripheral surface. 4. A perforated plate-made master is wound around the outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from the inner peripheral side of the plate cylinder, and the plate cylinder is passed through the plate-made master. The printing paper is pressed against the printing paper by a pressing means to transfer the ink oozed through the perforated portion of the prepressed master to the printing paper for printing, and after the printing, the used master is peeled from the plate cylinder. A stencil printing apparatus for discarding and disposing a sheet member displaceable between an operating position inserted between the pressing means and the plate cylinder and a standby position retracted outside the printing paper transport path; Sheet displacing means for selectively displacing the sheet member between the operating position and the standby position immediately before or after peeling the sheet member, and immediately before or after peeling the used master, the sheet member is moved to the operating position. And on Stencil printing apparatus characterized by comprising a rotation drive means for rotating a predetermined number of times the plate cylinder while being displaced between the standby position. 5. A perforated master having a perforated plate made thereon is wound on the outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from the inner peripheral side of said plate cylinder, and said plate cylinder is passed through said perforated master. The printing paper is pressed against the printing paper by a pressing means to transfer the ink oozed through the perforated portion of the prepressed master to the printing paper for printing, and after the printing, the used master is peeled from the plate cylinder. In the stencil printing machine for discarding, a heat roller which can freely contact and separate from the outer peripheral surface for heating and uniformizing the ink on the outer peripheral surface portion of the plate cylinder, and before or after peeling the used master Then, a heat roller displacing means for selectively displacing the heat roller to a pressure contact position where the heat roller is pressed against the outer peripheral surface and a non-pressure contact position separated from the pressure contact position; and before or after peeling the used master, Roller around the above While into contact or away from the stencil printing apparatus characterized by comprising a rotation drive means for rotating a predetermined number of times the plate cylinder. 6. A perforated plate-making master is wound around an outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied from an inner peripheral side of the plate cylinder, and the plate cylinder is passed through the plate-made master. The printing paper is pressed against the printing paper by a pressing means to transfer the ink oozed through the perforated portion of the prepressed master to the printing paper for printing, and after the printing, the used master is peeled from the plate cylinder. A stencil printing machine that disposes and discards a heat roller for heating and uniformizing the ink on the inner peripheral surface layer of the plate cylinder; Before or after peeling off, the heat roller displacing means for selectively displacing the heat roller to a pressure contact position for pressing the heat roller against the inner peripheral surface and a non-pressure contact position separated from the pressure contact position, and peeling the used master Before or after, heat roller above While into contact or away from the inner circumferential surface stencil printing apparatus characterized by comprising a rotation drive means for a predetermined number of times rotating the plate cylinder. 7. A stencil printing machine according to claim 7, further comprising a rotation number selecting means for selecting the predetermined number of times according to a printing time by the master and a pause of the stencil printing machine until the next master is wound. A stencil printer according to any one of claims 1 to 6.