JP5549852B2 - Stencil printing machine - Google Patents

Description

  The present invention relates to a stencil printing apparatus that punches and makes a master and winds the master around a porous plate cylinder to perform stencil printing on a recording medium. In particular, the master is peeled off from the plate cylinder. The present invention relates to a plate discharging apparatus provided with a plate discharging roller for disposal.

  Conventionally, a heat-sensitive digital stencil printing apparatus is known as a stencil printing apparatus. In a heat-sensitive digital stencil printing apparatus, a rotatable plate cylinder having a structure in which a plurality of mesh screens of a resin or metal net are wound around a porous support cylinder, and a thermoplastic resin film (thickness is about 1 to 3 μm). In general, a stencil master having a laminate structure in which a Japanese paper fiber or a synthetic fiber of a porous support or a mixture of Japanese paper and a synthetic fiber is bonded together is used.

  In the heat-sensitive digital stencil printing apparatus, the master film surface of the master is brought into contact with the heating element of the thermal head, the thermal head is energized and the master is heated and punched while being conveyed by a platen roller or the like, and the master is wound around the plate cylinder Then, ink is supplied from an ink supply part provided inside the plate cylinder, and the sheet is continuously pressed against the plate cylinder by a pressing means made of an elastic member such as nitrile rubber or chloroprene rubber as an elastic body. Ink is oozed out from the aperture and the master perforation, and printing is performed (see, for example, Patent Documents 1 to 3).

  In addition, in the conventional stencil printing apparatus, when plate making winding with a new document is performed, the used old master is peeled and discharged from the plate cylinder, and a plate discharging apparatus for automatically performing this is provided. There are some configurations.

  In a conventional plate discharging apparatus, generally, a plate cylinder clamper is opened at a predetermined position, and a pair of upper and lower plate discharging rollers rotate in contact with a master wound around the plate cylinder in a free state, thereby causing the master to move. By discharging while pinching between the upper and lower plate discharge rollers, it is disposed in the plate discharge box.

  At this time, the upper plate discharge roller conveys the plate while making contact with the master surface side, and the lower plate discharge roller is in contact with the back side of the master to which a large amount of ink is attached to the plate cylinder opening. For this reason, a large amount of ink is transferred and adhered to the upper and lower surfaces of the discharging roller that is rotating by pressing, and the master becomes slippery.

  For this reason, when printing is repeated in a short time, the ink is hard and there is no particular problem with the peeling of the master.However, if the ink is left for a long time after printing, the clamper is opened and the discharge roller is turned off. Even if it rotates in contact with the master, only the oil component of the ink adhering to the roller surface remains without evaporating. For this reason, the oil component acts as a lubricant between the plate discharge roller surface and the master surface. As a result, the master becomes slippery, the master cannot be peeled off, and jamming is likely to occur.

  In addition to the cylindrical roller, the impeller-shaped roller type described in Patent Documents 4 to 7 may be used as the discharge roller. Even if this impeller is brought into contact with the master, the impeller is easily bent and easily escaped. For this reason, the impeller prevents the sticking of the master to the pair of discharge rollers, and attracts the tip of the master lifted from the clamper by the auxiliary member, by pressing it by kicking rather than directly peeling the master from the plate cylinder. It is used as a member for

  In the conventional plate discharging apparatus, the impeller is provided at a position where ink adheres from the plate discharging roller. For this reason, when left standing for a long time after use, the oil content on the back side of the master that is in contact with the plate cylinder opening may gradually spread through the support of the master and reach the clamper.

  And when the bottom of the stage and the back of the master are stuck with oil, in addition to the sliding of the roller, the sticking force of the master also increases, and sticks to the support part in close contact with the oil on the back of the master, It becomes difficult to peel off. For this reason, a phenomenon that the master cannot be further peeled off and jam occurs more easily.

  This is particularly likely to occur when printing is performed by replacing a color plate cylinder (drum) that is rarely used and left for a long period of time.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a stencil printing apparatus provided with a stencil discharging apparatus having a configuration in which a master typographic error is unlikely to occur even when left for a long period of time.

  In order to achieve the above-mentioned object, the invention according to claim 1 wraps a master, which is heated and perforated by a plate-making means, on a plate cylinder composed of an opening portion and a non-opening portion that are rotatably supported. The recording medium is pressed against the plate cylinder by pressing means, and ink is oozed out from the opening portion of the plate cylinder and the perforated portion of the master to perform printing on the recording medium and face the plate cylinder. In a stencil printing apparatus that peels and discards the used master from the plate cylinder by a plate discharge roller held rotatably, a position corresponding to the non-opening portion of the plate cylinder at the end of the plate discharge roller Further, a peeling assist roller made of an elastic body is provided.

  With this configuration, by providing a peeling auxiliary roller at the master position corresponding to the outside of the perforated hole portion area in the plate cylinder, the roller does not come into contact with the ink on the front and back of the master from which the plate is discharged as in the prior art. A high coefficient of friction can be maintained. For this reason, even if the oil content of the ink that has been loosened after being left for a long time sticks to the surrounding members and the load increases, the ink adhered to the roller surface does not slip and can be peeled off reliably. In addition, even if the master end is stuck with oil or the like, it can be peeled off with less force than the center, and it can be peeled off more reliably than before, and the discharge roller etc. will slide and peel off. It is possible to prevent the printing plate from being jammed.

The invention described in claim 1 further includes control means for stopping the plate cylinder at the plate discharge processing position and the plate discharge pre-processing position with respect to the master, and the plate discharge roller is wound around the plate cylinder at the plate discharge pre-processing position. It is characterized in that it is configured to perform a cleaning process in which the used master is contacted and rotated for a predetermined time or a predetermined number of times, and thereafter, the master is peeled and discarded at the plate discharge processing position. Rubbing the adhering ink to the surface of the used master to be discarded before the plate is removed, and cleaning is performed to reduce the oil content of the ink. In addition, it becomes possible to generate a large peeling force and to prevent the occurrence of a peeling error.

According to a second aspect of the invention, in the stencil printing apparatus of claim 1 Symbol mounting, comprising a timer means for measuring the standing time after the last use of the stencil printing machine, when the time set in advance has elapsed , After performing the cleaning process at the time of winding the next plate making, it is characterized in that it is configured to execute the master peeling discard at the plate discharging processing position, and by this configuration, by measuring the standing time after use The cleaning process is performed when the predetermined time is exceeded, and the cleaning process is deleted when left for a short time, so that unnecessary loss time does not occur.

According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect , when another stencil cylinder is mounted in the stencil printing apparatus, the cleaning process is performed when the next stencil is wound. It is characterized by the fact that the master is peeled and discarded later at the plate removal processing position. With this configuration, cleaning is performed when another plate cylinder, which is often left for a long time during use, is installed. Since the plate discharging process is performed after the processing is performed, it is possible to generate a larger peeling force than before, and even if a different drum is incorporated in the middle, it is possible to prevent the occurrence of a peeling error.

  According to the present invention, by providing the peeling auxiliary roller at the master position corresponding to the outside of the perforated hole area in the plate cylinder, the roller does not come into contact with the ink on the front and back of the master from which the plate is discharged as in the prior art. , You will always be able to keep a high coefficient of friction. For this reason, even if the oil content of the ink that has been loosened due to being left for a long time sticks to the surrounding member and the load increases, the ink adhered to the roller surface does not slip and can be peeled off reliably. In addition, even if the master end is stuck with oil or the like, it can be peeled off with less force than the center, and it can be peeled off more reliably than before, and the discharge roller etc. will slide and peel off. It is possible to prevent the printing plate from being jammed.

  In addition, the ink adhering to the surface of the plate discharge roller is rubbed against the surface of the used master to be discarded before the plate is discharged, and cleaning is performed to reduce the oil content of the ink. It is possible to generate a peeling force larger than that in a state where the ink is adhered, and to further prevent occurrence of a peeling error.

Schematic configuration diagram of a stencil printing apparatus according to an embodiment of the present invention Side view showing main parts in the present embodiment Flowchart related to plate removal operation in this embodiment Configuration diagram of the main part for explaining the plate removal operation in the present embodiment Configuration diagram of the main part for explaining the plate removal operation in the present embodiment (A)-(c) is a figure which shows the various structures of the peeling auxiliary | assistant roller in this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

  In FIG. 1, reference numeral 1 denotes an opening 1 a that is supported by a support member (not shown) so as to be rotatable about a central axis, and allows ink to flow out at a central portion, and a center other than the opening 1 a. A plate cylinder having a porous and cylindrical structure in which non-opening portions 1b are formed at both ends in the vertical plane direction in part and in the drawings, 2 is an ink roller for supplying ink to the plate cylinder 1, and 3 is an ink A doctor roller that supplies ink to the roller 2, 4 is an ink reservoir for storing ink, 5 is an ink pipe for supplying ink to the ink roller 2, and 6 is a stage that rotatably supports the master clamp 7. is there.

  8 is a master wound around a roll core 8a and heated and perforated as described later, 9 is a thermal head, 10 is a platen roller, 11 is a pair of conveying rollers for feeding the master 8 in the plate cylinder direction, and 12 is a master 8 A cutter 13 cuts a predetermined length, and a master guide plate 13. A press roller 15 is a pressing roller that is rotatably provided on the support shaft 16 a of the roller arm 16 and presses the master 8 against the plate cylinder 1.

  Reference numeral 17 denotes a plate discharge roller, and 18 denotes a plate discharge roller. The plate discharge roller 17 and the plate discharge roller 18 cooperate with each other to peel the used master 1 away from the plate cylinder 1. Reference numeral 19 denotes a plate discharging box that receives the master 8 separated by the upper plate discharging roller 17 and the lower plate discharging roller 18.

  Reference numeral 20 denotes a pair of registration rollers for transporting paper or the like as a recording medium to the plate cylinder 1 in a timely manner, 21 is a paper discharge claw for peeling the printed paper from the master / plate cylinder, and 22 is a paper after printing. A receiving tray.

  The configuration of the stencil printing apparatus of this embodiment will be described more specifically.

  The roll core 8a around which the master 8 is wound is rotatably supported by holder means (not shown). The master 8 is pressed against a platen roller 10 rotatably supported by a housing side plate of the apparatus main body by a thermal head 9 made of a heating element, and the platen roller 10 is driven to rotate so that the master 8 is drawn out. Yes. The thermal head 9 is urged to the platen roller 10 via the master 8 by elastic means such as a spring.

  On the downstream side of the platen roller 10 with respect to the master conveyance, a conveyance roller pair 11 rotatably supported by the apparatus main body is provided. The conveyance roller pair 11 is set to a peripheral speed slightly higher than the conveyance speed of the master 8 by the platen roller 10, and applies an appropriate tension to the master 8. A cutter 12 for cutting the master 8 made by the thermal head 9 into a predetermined length is provided on the downstream side of the conveying roller pair 11. The cutter 12 has a configuration such as an upper and lower blade (guillotine type) or a rotary blade moving type. The leading end of the master 8 after cutting is guided by the master guide plate 13 and sent to the plate cylinder 1. Thus, a plate making section as plate making means is configured.

  On the lower left side in FIG. 1 of the plate-making part, a porous support cylinder in which an opening 1a and a non-opening 1b are formed, and a resin or a metal net that covers the outer periphery of the porous support cylinder A plate cylinder 1 on which a plurality of mesh screens are wound is supported on a flange (not shown) so as to be rotatable about an ink pipe 5 as a support shaft. A driving force is transmitted to the plate cylinder 1 by a driving motor (not shown), and the plate cylinder 1 is rotated clockwise in the drawing. In the ink supply section inside the plate cylinder 1, the ink roller 2 whose shaft portion is rotatably supported by a side plate (not shown) fixed to the ink pipe 5 is connected to the plate cylinder 1 by a drive transmission means such as a gear or a belt. Synchronously driven to rotate in the direction of the arrow.

  Further, a doctor roller 3 is provided with a slight gap from the outer peripheral surface of the ink roller 2, and the ink in the ink reservoir 4 formed in the wedge-shaped space between the ink roller 2 and the doctor roller 3 is supplied to the outer surface of the ink roller 2. To do. The ink in the ink reservoir 4 is sucked from the ink supply device by an ink pack provided outside the plate cylinder 1 and supplied to the ink reservoir 4 from the supply hole of the ink pipe 5.

  On the surface of the non-opening portion 1b of the plate cylinder 1, a stage 6 made of a magnetic material is provided along one bus bar of the plate cylinder 1. A clamper 7 that is rotatably supported by a clamper shaft 7 a that is parallel to the plate cylinder 1 is fixed to the stage 6. The clamper 7 is transmitted to the clamper shaft 7a by opening / closing means (not shown) and opened and closed at a predetermined position. The plate cylinder 1 is an integral unit together with the ink supply unit and the like, and can be engaged and disengaged in the axial direction.

  A plurality of roller arm pairs 16 are fixed to a lower side of the plate cylinder 1 on a roller arm shaft 16a rotatably supported by a casing side plate in a direction perpendicular to the drawing. The roller arm pair 16 is rotatably provided with a press roller 15 as pressing means. A cam follower (not shown) is provided at the shaft end of the press roller shaft 16a and is urged clockwise by a spring as an urging means, and the roller arm pair 16 approaches / separates from the plate cylinder 1 by a cam (not shown). To move in the direction you want.

  As shown in FIG. 1, the press roller 15 is held at a position separated from the plate cylinder 1 by locking means (a stopper and a solenoid for driving the stopper). The press roller 15 is configured to approach the plate cylinder 1 from a position slightly apart from the front edge of the opening portion 1a of the plate cylinder 1 approaching from a position separated from the plate cylinder 1.

  Further, on the right side of the press roller 15 in FIG. 1, a sheet feeding tray (not shown), a separation sheet feeding device that feeds sheets stacked on the sheet feeding tray, and a sheet fed from the separation sheet feeding device are pressed rollers. A registration roller pair 20 is provided between 15 and the plate cylinder 1 for feeding and transporting the paper in a timely manner. The registration roller pair 20 is supported by a housing side plate of the apparatus main body so as to be rotatable while being in contact with each other.

  A peeling claw 21 is provided on the lower left side of the plate cylinder 1 in FIG. 1 to selectively approach the plate cylinder 1 and peel off the printed paper. A paper discharge tray 22 is provided on which the stacked sheets are stacked.

  On the left side of the plate cylinder 1 in FIG. 1, an upper plate discharge roller 17 and a lower plate discharge roller 18 made of an elastic body are rotatably supported by a casing side plate of the apparatus main body in contact with each other. The upper plate discharge roller 17 and the lower plate discharge roller 18 are driven to rotate in opposite directions by a motor or the like. The upper plate discharging roller 17 is adapted to come into contact with the surface of the plate cylinder 1 under the driving of the driving means. As shown in the side view of the main part of FIG. 2, peeling auxiliary rollers 17a made of an elastic material are provided at both ends of the upper plate discharging roller 17.

  The peeling assist roller 17 a is provided at a position facing the master 8 covering the plate cylinder 1 and at a position corresponding to the non-opening portion 1 b of the plate cylinder 1. That is, when the used master 8 is discharged, the peeling assist roller 17a is arranged in a region where there is no adhered ink inside the master 8. On the downstream side of the master conveyance of the upper plate discharge roller 17 and the lower plate discharge roller 18, a detachable plate release box 19 for storing the discharged used master 8 is provided, and these constitute a plate discharge device.

  Thus, by providing the separation assisting roller 17a at a position corresponding to the non-opening portion 1b outside the opening portion 1a region in the plate cylinder 1, the ink on the front and back sides of the master from which the discharging roller is discharged as in the prior art. It becomes possible to always keep a high coefficient of friction.

  For this reason, even if the oil content of the ink that has been loosened due to being left for a long time sticks to the surrounding member and the load increases, the ink adhered to the roller surface does not slip and can be peeled off reliably. Further, even if the end portion of the master 8 is stuck with oil or the like, it can be peeled off with a force smaller than that of the central portion, and can be peeled off more reliably than before. It is possible to prevent the plate 18 from slipping and being peeled off and becoming a discharged plate jam.

  Next, operations related to plate making / printing in the present embodiment will be described. The following operation control is executed by a CPU (Central Processing Unit) (not shown).

  When the original is sent to the original reading unit and the plate making is started, the master 8 is conveyed by the platen roller 10 and the conveying roller 11, and the master 8 is generated by the heating element of the thermal head 9 according to the image information read by the original reading unit. The heat sensitive film is heated and perforated to make a plate.

  When the master guide plate 13 guides the tip of the master 8 between the stage 6 and the clamper 7 and determines that the tip of the master 8 has arrived at the clamper 7, the clamper 7 is closed and the tip of the master 8 is moved. The plate cylinder 1 is rotated at substantially the same speed as the conveyance speed of the master 8 and the master 8 made from the plate is wound around the plate cylinder 1 while being sucked and sandwiched.

  When it is determined that the plate making is completed, the cutter 12 is operated, the master 8 is cut, the platen roller 10 and the conveying roller pair 11 are stopped, and the rear end of the cut master 8 is the plate cylinder 1. And the winding of the master 8 around the plate cylinder 1 is completed.

  When the winding of the master 8 around the plate cylinder 1 is completed, the sheets stacked on the sheet feeding tray are separated and fed one by one in accordance with the number of printed sheets set by the operator in synchronization with the winding process. The sheet is fed, timed by the registration roller pair 20, and sent between the plate cylinder 1 and the press roller 15.

  When the conveyance of the sheet is detected by the sensor, the locking means of the press roller 15 is released, and the press roller 15 is raised by rotating clockwise with the roller arm shaft 16a as a fulcrum. The paper is continuously pressed from the front edge portion 1a. Then, the paper is peeled off by the peeling claw 21 approaching the plate cylinder 1 while being printed by the ink oozed from the perforated part of the master 9 wound around the opening 1a of the plate cylinder 1, and further discharged. The paper is transported by the transport means and discharged and stacked on the paper discharge tray 21.

  Next, the plate discharging operation of the stencil printing apparatus, which is a feature of this embodiment, will be described with reference to the flowchart of FIG. 3 and FIGS. 4 and 5.

  After the apparatus is turned on, a CPU (central processing unit), which is a control means, checks the leaving time by a timer means to determine whether or not to perform a preliminary cleaning process. If the neglected time is short and the process proceeds to the next process as it is (NO in S1), the preliminary cleaning process is skipped and the process proceeds to the plate discharging process.

  On the other hand, when the leaving time is long and the preliminary cleaning process is performed (YES in S1), when a document is set in a document reading unit (not shown) and a start signal (eg, start button is turned on) is output, It is rotationally driven and temporarily stopped at the pre-plate removal processing position B shown in FIG. 4 (S2).

  When the plate cylinder 1 stops, as shown in FIG. 4, the upper plate discharge roller 17 and the lower plate discharge roller 18 are rotated in opposite directions (arrow directions), and the upper plate discharge roller 17 is brought into contact with the plate cylinder 1. (S3) and rotate for a predetermined time or a predetermined number of times (S4).

  As a result, the ink adhering to the surface of the upper plate discharging roller 17 and the lower surface of the discharging roller 18 is transferred so as to be rubbed against the surface of the used master 8 to be discarded later, and preliminary cleaning is performed. At this time, it is conceivable that the contact range of rubbing between the used master 8 and the upper plate discharge roller 17 is lengthened while the plate cylinder 1 is slightly rotated to perform the cleaning efficiently.

  When the preliminary cleaning is completed (YES in S4), the upper plate discharge roller 17 is separated from the plate cylinder 1 and enters a plate discharge standby state (S5).

  Next, the plate cylinder 1 is rotated to the plate removal processing position A shown in FIG. 5 and stopped (S6), and the clamper 7 is opened. After the used master 8 is released by the clamper 7, as shown in FIG. 5, the upper plate discharge roller 17 is brought into contact with and rotated on the surface of the plate cylinder 1 to peel off the used master 8 and below the plate discharge roller. 18, the tip of the used master 8 is clamped. Then, after closing the clamper 7, the used master 8 is continuously peeled off in cooperation with the rotation of the plate cylinder 1 (S7), and the mask 8 is conveyed and discarded to the plate discharge box 19 (S8).

  After the completion of the plate removal process, the plate cylinder 1 is rotated and stopped until the clamper 7 is located at a position substantially beside the plate cylinder 1, and the clamper 7 is released again. In this state, a plate feed standby state is established.

  By performing the preliminary cleaning, the ink adhering to the surface of the plate discharge rollers 17 and 18 is rubbed against the surface of the used master to be discarded before the plate discharge, thereby reducing the oil content of the ink. Can do. For this reason, it is possible to generate a peeling force larger than that in a state where normal ink is attached, and it is possible to prevent the occurrence of a peeling error.

  The preliminary cleaning may be set so as to be automatically executed every predetermined number of times of printing or number of times of discharging. Further, when another color plate cylinder is exchanged during the use of the apparatus, the winding printing may be performed after the preliminary cleaning step at the next plate making. Since the operation is the same as the above-described operation, it will be omitted.

  In the present embodiment, the upper plate discharge roller 17 is in contact with the plate cylinder 1, but the configuration is not limited thereto, and the lower plate discharge roller 18 may be in contact with the plate cylinder 1. 17a is provided coaxially with the lower plate discharge roller 18.

  Moreover, as the peeling assisting roller 17a, ones having the shapes shown in FIGS. 6A to 6C can be used.

  The present invention is applied to a plate discharging apparatus of a stencil printing apparatus that punches and makes a master made of a thermoplastic resin film, winds the master around a porous plate cylinder, and performs stencil printing on paper or the like. Therefore, it is effective as a plate removal device having a configuration in which it is difficult to cause a master plate removal mistake even if left for a long period of time.

DESCRIPTION OF SYMBOLS 1 Plate cylinder 1a Opening part 1b Non-opening part 2 Ink roller 3 Doctor roller 5 Ink pipe 8 Master 9 Thermal head 10 Platen roller 12 Cutter 15 Press roller 17 Discharge upper roller 17a Auxiliary release roller 18 Lower discharge roller 19 Discharge box

Japanese Utility Model Publication No. 5-23347 JP-A-10-166708 JP 2007-168244 A Japanese Patent No. 3759265 JP 2000-43394 A JP 2004-148514 A JP 2007-245510 A

Claims (3)

A master formed by heating and perforating by a plate making means is wound around a plate cylinder composed of an opening portion and a non-opening portion that are rotatably supported, and a recording medium is pressed against the plate cylinder by a pressing means. Printing is performed on the recording medium by causing ink to ooze out from the opening portion of the cylinder and the perforation portion of the master, and from the plate cylinder by a plate discharge roller held rotatably against the plate cylinder. In a stencil printing apparatus that peels and discards the used master,
A peeling auxiliary roller made of an elastic body is provided at a position corresponding to the non-opening portion of the plate cylinder at an end of the plate discharge roller, and the plate cylinder is stopped at a plate discharge processing position and a plate discharge preprocessing position with respect to the master. A control unit for performing a cleaning process in which the discharged roller is contacted and rotated for a predetermined time or a predetermined number of times by the used master wound around the plate cylinder at the pre-plate release processing position. A stencil printing apparatus , wherein the master is configured to be discarded at a processing position . The stencil printing apparatus is provided with a timer means for measuring a leaving time after the previous use of the stencil printing apparatus, and when the preset time has elapsed, after performing the cleaning process at the time of winding the next plate making, the plate discharging processing position stencil printing machine according to claim 1, characterized by being configured so as to perform the peeling waste hoax register. When another plate cylinder is mounted in the stencil printing apparatus , the master is peeled and discarded at the discharge plate processing position after the cleaning process is performed when the next plate making is wound. The stencil printing apparatus according to claim 1 or 2.

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