JP2009292024A - Stencil printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printing device which can obtain a good printing result from the very start of the printing even the stencil printing device equipped with a top-and-bottom-movement mechanism or a left-and-right-movement mechanism is left unattended for a long period of time. <P>SOLUTION: In a stencil printing device including a plate cylinder 7 having aperture in its circumferential surface, an inking roller 10 to feed ink to the inner circumferential surface of the plate cylinder 7, an impression means 16 which is installed attachably to and detachably from the circumferential surface of the inking roller 10 through the aperture and impresses paper onto the outer periphery of the plate cylinder 7, and the left-and-right-movement mechanism 28 to move the aperture to the shaft orientations of the plate cylinder 7, the stencil printing device has the idle turning mode in which the aperture is moved further from the reference point to the shaft orientations and rotates the plate cylinder 7 with a non-engraved master wrapped around the outer periphery and contacts the impression means 16 onto the outer periphery without a feeding of any paper. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stencil printing apparatus provided with a top-bottom moving mechanism or a left-right moving mechanism.

  Conventionally, digital thermal stencil printing is known as a simple printing method. This is because a thermal head having a plurality of fine heating elements is brought into contact with a master obtained by bonding a thermoplastic resin film and a porous support, and the master is placed on a platen roller or the like while energizing the heating elements in a pulsed manner. After the punched image based on the image information is hot-melt perforated and engraved on the thermoplastic resin film of the master by conveying with a conveying means, the perforated master is wound around a porous cylindrical plate cylinder and pressed. By pressing the paper against the outer peripheral surface of the plate cylinder by pressing means such as a roller, the ink supplied to the inner peripheral surface of the plate cylinder is oozed out from the plate cylinder opening portion and the master punching portion, and this ink is transferred to the paper A printed image is obtained on a sheet.

  In the stencil printing apparatus that performs the stencil printing described above, if the printing apparatus is left for a long period of time, the ink adhering to the plate cylinder opening is denatured, and when performing the next printing, a plurality of sheets are obtained until a good image is obtained. However, there is a problem in that it has a bad influence on the cost and work efficiency. Thus, for example, “Patent Document 1” discloses a technique for obtaining a good printed material from the first sheet even when a new plate-making printing operation is performed after the stencil printing apparatus is left for a long period of time.

JP-A-11-268390

  In the current stencil printing apparatus, in order to obtain a print image at a desired position on the paper, a vertical movement mechanism that adjusts the print image in the paper transport direction with respect to the paper and / or a left-right movement that adjusts in a direction orthogonal to the paper transport direction. One with a mechanism is known. In the stencil printing apparatus provided with the above-mentioned vertical movement mechanism or left / right movement mechanism, a “patent” is used when the apparatus is not used for a long period of time on the inner surface of the plate cylinder, which is an adjustment margin for vertical movement or horizontal movement, which is not used in normal printing. Even if the technique disclosed in “Document 1” is used, the modified ink remains, so that there is a problem that printing failure occurs at the beginning of printing.

  The present invention solves the above-described problems and provides a stencil printing apparatus capable of obtaining a good printed matter from the beginning even after the stencil printing apparatus having a top-and-bottom movement mechanism or a left-right movement mechanism is left for a long period of time. For the purpose of provision.

  The invention according to claim 1 includes a plate cylinder having an opening portion on a peripheral surface, an ink roller for supplying ink to an inner peripheral surface of the plate cylinder, and a peripheral surface of the ink roller through the opening portion. In the stencil printing apparatus, comprising: a pressing unit that is detachably provided and presses a sheet against an outer peripheral surface of the plate cylinder; and a left-right moving mechanism that moves the hole portion in an axial direction of the plate cylinder. An idling mode in which the plate cylinder is rotated by moving the portion from the reference position in the axial direction, winding a plate-free master around the outer peripheral surface, and bringing the pressing means into contact with the outer peripheral surface without passing paper. It is characterized by that.

  According to a second aspect of the present invention, there is provided a plate cylinder having an opening portion on a peripheral surface, an ink roller for supplying ink to an inner peripheral surface of the plate cylinder, and a peripheral surface of the ink roller through the opening portion. In the stencil printing apparatus, comprising: a pressing unit that is detachably provided and presses a sheet against an outer peripheral surface of the plate cylinder; and a left-right moving mechanism that moves the hole portion in an axial direction of the plate cylinder. Having an idle rotation mode in which the plate cylinder is moved from the reference position in the axial direction, the plate making master is wound around the outer peripheral surface, and the pressing means is brought into contact with the outer peripheral surface in a paper state to rotate the plate cylinder. Features.

  According to a third aspect of the present invention, a plate cylinder having an opening on the peripheral surface, an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, and the inner peripheral surface and the peripheral surface of the ink roller are in contact with each other. In the stencil printing apparatus comprising an ink replenishing roller and a left-right moving mechanism for moving the aperture in the axial direction of the plate cylinder, the ink replenishing roller moves the aperture from the reference position in the axial direction. In the idling mode in which the plate cylinder is rotated in a non-sheet-passing state by contacting the inner circumferential surface and the circumferential surface of the ink roller.

  According to a fourth aspect of the present invention, there is provided a plate cylinder, a pressure cylinder that holds a sheet on an outer peripheral surface and presses the sheet against the plate cylinder, and a contact position between the plate cylinder and the impression cylinder indicates a rotation direction of the plate cylinder. In the stencil printing apparatus having a top-and-bottom movement mechanism, the contact position is moved from the reference position in the rotational direction, and a plate-making master is wound around the outer peripheral surface so that the impression cylinder is in a paper-free state. It has an idling mode in which the plate cylinder is rotated in contact with the plate cylinder.

  According to a fifth aspect of the present invention, there is provided a plate cylinder, a pressure cylinder that holds a sheet on an outer peripheral surface thereof and presses the sheet against the plate cylinder, and a contact position between the plate cylinder and the impression cylinder indicates a rotation direction of the plate cylinder. In the stencil printing apparatus comprising a top and bottom moving mechanism for moving the plate, the contact position is moved in the rotational direction from a reference position, a plate making master is wound around the outer peripheral surface, and the plate is passed through the impression cylinder. It has an idling mode in which the plate cylinder is rotated in contact with the cylinder.

  According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fifth aspects, the idling mode is executed when the apparatus is left for a predetermined time. .

  The invention according to claim 7 is the stencil printing apparatus according to any one of claims 1 to 5, wherein the unnecessary display or the like is turned off when the apparatus is left for a first predetermined time. The idling mode is executed when the apparatus is shifted to the power mode and the apparatus is left for a second predetermined time shorter than the first predetermined time.

  According to the present invention, since all of the modified ink remaining on the outer sides of both ends of the ink roller is transferred to the paper, printing is performed in the absence of the remaining modified ink when printing is newly performed. And a good printed image can be obtained from the first sheet.

  FIG. 1 shows a stencil printing apparatus applicable to the first to third embodiments of the present invention. In FIG. 1, a master roll 1a obtained by winding a master 1 having a thermoplastic resin film surface in a roll shape is rotatably supported by a master holding means (not shown). A platen roller 2 rotatably supported by a plate making unit side plate (not shown) and a thermal head 3 having a number of heating elements are disposed on the left side of the master roll 1a. The platen roller 2 is driven by a stepping motor (not shown). The thermal head 3 is driven to rotate and is pressed against the platen roller 2 by a biasing means (not shown). The master 1 is fed out from the master roll 1a when the platen roller 2 rotates counterclockwise in FIG.

  On the downstream side of the platen roller 2 in the master conveyance direction, a master conveyance roller pair 4, a master cutting means 5, and a master guide plate 6 are arranged in this order. The master conveying roller pair 4 includes a driving roller and a driven roller pressed against the driving roller. The driving roller is rotated by driving means (not shown) to sandwich and convey the master 1. The master conveyance speed by the master conveyance roller pair 4 is set slightly faster than the master conveyance speed by the platen roller 2, and a predetermined tension is applied to the master 1 between the two. The master cutting means 5 has an upper blade and a lower blade, and has a well-known configuration for cutting the master 1 by vertical movement or rotational movement between them. A master guide plate 6 that guides the master 1 toward a plate cylinder 7 to be described later is fixed to a plate making unit side plate (not shown). The platen roller 2, the thermal head 3, the master conveying roller pair 4, the master cutting means 5, and the master guide plate 6 constitute a plate making section.

  A plate cylinder 7 having a porous support plate 7a (see FIG. 2) having an aperture and a resin or metal mesh mesh screen covering the outer periphery of the plate is disposed at the lower right of the plate making section. . The plate cylinder 7 has a porous support plate 7a fixed to a pair of flanges 24 and 25 (see FIG. 2) rotatably supported by a support shaft 8 also serving as an ink supply pipe fixed to a side plate (not shown) of the apparatus main body. And is rotationally driven by a plate cylinder driving means (not shown). An ink roller side plate 19 fixed to the support shaft 8 is provided inside the plate cylinder 7. The ink roller side plate 19 is provided with an ink roller 10 that rotatably supports a shaft portion 10a. Yes. The ink roller 10 is rotated in the same direction in synchronism with the plate cylinder 7 by transmitting a driving force from a plate cylinder driving unit (not shown) by a driving transmission unit (not shown) such as a gear or a belt. In the vicinity of the ink roller 10, a rotatable doctor roller 11 is disposed with its peripheral surface being close to the peripheral surface of the ink roller 10. Ink sucked from an ink pack or the like by an ink supply device (not shown) is supplied from the supply hole of the support shaft 8 to the vicinity of the ink roller 10 and the doctor roller 11 to form an ink reservoir 12, and the ink in the ink reservoir 12 is formed. Is supplied to the peripheral surface of the ink roller 10 while being kneaded.

  An ink replenishing roller 20 is disposed inside the plate cylinder 7 and in the vicinity of the ink roller 10. The ink replenishing roller 20 is rotatably supported by a bracket 21, and the bracket 21 has a displacement portion 22 connected to a worm 23 provided in the displacement motor 9. With the above configuration, the ink replenishing roller 20 is rotated by the rotation of the displacement motor 9 as shown in FIG. 1, and is separated from the inner peripheral surface of the plate cylinder 7 and the peripheral surface of the ink roller 10, and the inner periphery of the plate cylinder 7. And abutment positions that respectively abut against the surface and the peripheral surface of the ink roller 10 are selectively occupied.

  On the outer peripheral surface of the plate cylinder 7, a planar stage 13 along one generatrix of the plate cylinder 7 is made of a magnetic material. On the stage 13 is disposed a clamper 14 rotatably supported by a support shaft provided in parallel therewith. The clamper 14 is provided with a magnet that can be magnetically attached to the stage 13, and the clamper 14 is opened and closed by an opening / closing device (not shown) when the plate cylinder 7 occupies a predetermined position.

  A paper feeding unit is disposed on the lower right side of the plate cylinder 7. The paper feed unit includes a paper feed tray (not shown) on which the paper 15 is stacked, a paper feed roller 17 that separates and feeds the paper 15 one by one from a paper feed tray (not shown), and the paper 15 that is separated and fed by the paper feed roller 17. Is a well-known configuration having a registration roller pair 18 that feeds the toner toward the plate cylinder 7 at a predetermined timing.

  Below the plate cylinder 7, a press roller 16 is disposed as a pressing unit that presses the sheet 15 fed from the sheet feeding unit against the outer peripheral surface of the plate cylinder 7 and transfers a print image onto the sheet. The press roller 16 is rotatably supported by an arm member (not shown), and is configured to be able to contact and separate from the outer peripheral surface of the plate cylinder 7 by swinging an arm member (not shown) by a swing means (not shown). Yes. At the upper left of the plate cylinder 7, a well-known plate discharging means 29 for separating and discarding the used master from the outer peripheral surface of the plate cylinder 7 is disposed.

  As shown in FIG. 2, a left / right moving mechanism 28 is disposed inside the plate cylinder 7. The left / right moving mechanism 28 includes a moving rack 26, a moving motor 27, and the like. The flanges 24 and 25 that support the porous support plate 7a are rotatably supported by the support shaft 8 and are also movably supported in the axial direction. When one flange 24 moves in the axial direction, the flange 24 and 25 are porous. The other flange 25 is also moved through the support plate 7a. A flange-shaped projection is formed on the inside of the plate cylinder of the flange 24, and this projection engages with a movable rack 26 supported on a side plate (not shown) fixed to the support shaft 8 so as to be axially movable. is doing. The movable rack 26 is connected to a worm attached to the output shaft of the movable motor 27 via a worm wheel. The movable rack 26 moves in the axial direction, which is the left-right direction in FIG. Thereby, each flange 24 and the porous support plate 7a supported by these move in the axial direction.

  The operation of the above-described stencil printing apparatus will be described below. When a start key (not shown) is pressed after a document is set in an image reading unit (not shown), the used master is peeled off from the outer peripheral surface of the plate cylinder 7 by the plate discharging means 29 while the plate cylinder 7 rotates. The plate cylinder 7 rotates and stops to the plate feeding position where the clamper 14 is positioned almost directly above, and the clamper 14 is opened by an unillustrated opening / closing device, and the stencil printing apparatus enters a plate feeding standby state.

  Thereafter, the heating element of the thermal head 3 is energized based on the read document image information, and the master 1 is sent from the master roll 1a by the platen roller 3 and the master conveying roller pair 4, whereby the thermoplasticity of the master 1 is reached. A plate-making image is formed on the resin film surface. The master 1 on which the plate-making image is formed is guided by the master guide plate 6 and sent between the stage 13 and the clamper 14. If it is determined from the number of steps of a stepping motor (not shown) that drives the platen roller 2 that the leading end of the master 1 has been transported to a predetermined position, an opening / closing device (not shown) is actuated to close the clamper 14 and the outer periphery of the plate cylinder 7. The tip of the master 1 is held on the surface.

  Thereafter, the plate cylinder 7 starts to rotate counterclockwise at substantially the same speed as the conveyance speed of the master 1 in FIG. 1, and the master 1 thus made is wound around the plate cylinder 7. When it is determined from the number of steps of a stepping motor (not shown) that drives the platen roller 2 that the plate making for one plate has been completed, the master cutting means 5 operates to cut the master 1 and at the same time the platen roller 2 and the master transport roller. The operation of pair 4 is stopped. The cut master 1 is pulled out from the plate making section by the rotation of the plate cylinder 7, and the winding operation of the master 1 around the plate cylinder 7 is completed.

  When the winding operation is completed, the sheet feeding roller 17 rotates and the sheet 15 is separated and fed from the sheet feeding unit. The separated and fed paper 15 is timed by the registration roller pair 18 and then fed between the plate cylinder 7 and the press roller 16. The fed paper 15 is pressed against the master 1 wound on the outer peripheral surface of the plate cylinder 7 by the press roller 16 being pressed against the outer peripheral surface of the plate cylinder 7 by the operation of a swinging means (not shown). The ink supplied by the ink roller 10 by pressing is transferred from the inner peripheral surface of the plate cylinder 7 to the paper 15 through the opening portion, the mesh screen, and the punching portion of the master 1 to perform printing. The paper 15 to which the print image is transferred is sent to a paper discharge unit (not shown) and discharged and stacked on a paper discharge tray (not shown). Prior to this printing operation, when the operator sets the position of the print image printed on the paper on the operation panel (not shown) in the left-right direction, which is the plate cylinder axis direction, the left-right moving mechanism 28 is activated to make the porous The support plate 7a is moved by a set amount in the left-right direction, and the image position printed on the paper 15 is changed in the left-right direction.

  In the above-described stencil printing apparatus, when a printing operation is performed for a long time without using the left / right moving mechanism 28, the ink 30 remains on the outside of both end portions of the ink roller 10 as shown in FIG. In this state, when the printing operation is performed after operating the left / right moving mechanism 28 to change the printing position, the remaining denatured ink is supplied to the inner peripheral surface of the plate cylinder by the ink roller 10 and a good print image is obtained. A problem arises in that a plurality of defective print sheets must be discharged before they are obtained.

  Therefore, in the first embodiment of the present invention, the master 1 that has been subjected to plate making is wound around the plate cylinder 7, and the plate cylinder 7 is rotated in a state where the paper 15 is passed between the plate cylinder 7 and the press roller 16. However, an idling mode in which the press roller 16 is pressed against the plate cylinder 7 is provided. This idling mode is automatically executed when the elapsed time from the previous printing exceeds a predetermined time set in advance by a timer (not shown) provided in the stencil printing apparatus. Hereinafter, the operation in the idling mode will be described.

  When a main power source (not shown) of the stencil printing apparatus is turned on, a timer (not shown) calculates an elapsed time from the previous printing, and the idling mode is executed when the elapsed time exceeds a predetermined time. In the idling mode, after the main power is turned on, the plate discharging means 29 is operated to peel off the used master from the outer peripheral surface of the plate cylinder 7. Thereafter, the plate making unit is operated to wind the master 1 around the plate cylinder 7. At this time, a preset plate making image is formed on the master 1. After the winding operation is completed, the left and right moving mechanism 28 is operated to move the plate cylinder 7 to either the left or right limit position, and then the plate cylinder 7 starts to rotate. The press roller 16 is pressed against the peripheral surface of the plate cylinder 7 in a state where one sheet 15 is fed from the sheet feeding unit. As shown in FIG. 4, the ink 30 remaining on the outer side of one end of the ink roller 10 is pressed by the press roller 16 and transferred from the inner peripheral surface of the plate cylinder 7 to the paper 15. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the press roller 16 through the paper 15 during this rotation.

  When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining on the outer side of one end of the ink roller 10 is transferred to the paper 15 via the inner peripheral surface of the plate cylinder 7, the rotation of the plate cylinder 7 is stopped. To do. Thereafter, the left / right moving mechanism 28 is actuated again, and after the plate cylinder 7 is moved to either the left or right limit position, the press roller 16 is fed in a state where one sheet 15 is fed from the paper feed unit as described above. Is pressed against the peripheral surface of the plate cylinder 7. As a result of this pressure contact, the ink 30 remaining outside the other end of the ink roller 10 is pressed by the press roller 16 and transferred to the paper 15 via the inner peripheral surface of the plate cylinder 7 as shown in FIG. . The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the press roller 16 through the paper 15 during this rotation.

  When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining outside both ends of the ink roller 10 is transferred to the paper 15 via the inner peripheral surface of the plate cylinder 7, the rotation of the plate cylinder 7 is stopped. The left / right moving mechanism 28 is operated to return the plate cylinder 7 to the initial position. As a result of this series of operations, all of the modified ink 30 remaining on the outer sides of both ends of the ink roller 10 is transferred to the paper 15, and the stencil printing apparatus enters a standby state. Thereafter, when a new document is set in an image reading unit (not shown) and then a start key (not shown) is pressed, the idle mode master 1 wound around the outer peripheral surface of the plate cylinder 7 is peeled off and the document is released. The master 1 on which the plate-making image corresponding to the image is formed is wound around the plate cylinder 7 and printing is performed.

  According to the above-described configuration, since all of the modified ink 30 remaining on the outer sides of both ends of the ink roller 10 is transferred to the paper 15, there is no remaining modified ink 30 when printing is newly performed. Printing can be performed in a state, and a good print image can be obtained from the first sheet.

  Next, a second embodiment of the present invention will be described. In this second embodiment, the master 1 in the non-plate-making state is wound around the plate cylinder 7, and the press is performed while rotating the plate cylinder 7 without passing the paper 15 between the plate cylinder 7 and the press roller 16. An idling mode in which the roller 16 is pressed against the plate cylinder 7 is provided. Hereinafter, the operation in the idling mode will be described.

  When a main power source (not shown) of the stencil printing apparatus is turned on, a timer (not shown) calculates an elapsed time from the previous printing, and the idling mode is executed when the elapsed time exceeds a predetermined time. In the idling mode, after the main power is turned on, the plate discharging means 29 is operated to peel off the used master from the outer peripheral surface of the plate cylinder 7. Thereafter, the plate making unit is operated to wind the master 1 around the plate cylinder 7. At this time, the heating elements of the thermal head 3 are not energized, and the master 1 is wound with no plate making. After the winding operation is completed, the left and right moving mechanism 28 is operated to move the plate cylinder 7 to either the left or right limit position, and then the plate cylinder 7 starts to rotate. Then, the press roller 16 is pressed against the peripheral surface of the plate cylinder 7 in a state where the paper 15 is not passed from the paper feeding unit. As a result of this pressure contact, as shown in FIG. 4, the ink 30 remaining outside one end of the ink roller 10 is pressed by the press roller 16 and supplied to the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the press roller 16 during this rotation.

  When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining on the outer side of one end of the ink roller 10 is supplied to the inner peripheral surface of the plate cylinder 7, the rotation of the plate cylinder 7 is stopped. Thereafter, the left / right moving mechanism 28 is actuated again, and after the plate cylinder 7 is moved to the left or right limit position, the press roller 16 in a state in which the paper 15 is not passed from the paper feed unit as described above. Is pressed against the peripheral surface of the plate cylinder 7. By this pressure contact, as shown in FIG. 5, the ink 30 remaining outside the other end of the ink roller 10 is pressed by the press roller 16 and supplied to the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the press roller 16 during this rotation.

  When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining outside both ends of the ink roller 10 is supplied to the inner peripheral surface of the plate cylinder 7, the left / right moving mechanism 28 is moved after the rotation of the plate cylinder 7 is stopped. The plate cylinder 7 is returned to the initial position by operating. As a result of this series of operations, all of the modified ink 30 remaining on the outer sides of both ends of the ink roller 10 is supplied to the master 1 in the non-plate-making state, and the stencil printing apparatus is in a standby state. Thereafter, when a start key (not shown) is pressed after a new document is set in an image reading unit (not shown), a masterless master including the remaining ink 30 wound around the outer peripheral surface of the plate cylinder 7 is used. The master 1 on which the plate-making image corresponding to the original image is formed is peeled off and wound around the plate cylinder 7 for printing.

  According to the above-described configuration, the same effect as that of the first embodiment can be obtained without using the sheet 15, so that the cost for the sheet 15 is reduced in addition to the effect of the first embodiment. be able to. In the first and second embodiments described above, the stencil printing apparatus having the ink replenishment roller 20 and the member that moves the stencil printing apparatus is shown. However, a stencil printing apparatus that does not have these may be used. .

  Next, a third embodiment of the present invention will be described. In the third embodiment, there is provided an idling mode in which the plate cylinder 7 is rotated in a state where the used master of the previous plate is wound around the plate cylinder 7 and the ink replenishing roller 20 is positioned at the contact position. Yes. Hereinafter, the operation in the idling mode will be described.

  When a main power source (not shown) of the stencil printing apparatus is turned on, a timer (not shown) calculates an elapsed time from the previous printing, and the idling mode is executed when the elapsed time exceeds a predetermined time. In the idling mode, the plate cylinder 7 is moved to the left or right limit position by operating the left / right moving mechanism 28, and then the plate cylinder 7 is operated after the displacement motor 9 is operated to occupy the contact position. 7 starts to rotate. By this rotation, as shown in FIG. 6, the ink 30 remaining on the outer side of one end of the ink roller 10 is pressed by the ink replenishing roller 20 and supplied to the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times.

When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining on the outer side of one end of the ink roller 10 is supplied to the inner peripheral surface of the plate cylinder 7, the rotation of the plate cylinder 7 is stopped. afterwards,
After the ink replenishing roller 20 is moved to the separation position, the left / right moving mechanism 28 is actuated again, and after the plate cylinder 7 is moved to either the left or right limit position, the ink replenishing roller 20 again assumes the contact position. In this state, the plate cylinder 7 is rotated in the same manner as described above. By this rotation, as shown in FIG. 7, the ink 30 remaining outside the other end of the ink roller 10 is pressed by the ink replenishing roller 20 and supplied to the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times.

  When the plate cylinder 7 is rotated a predetermined number of times and all the ink 30 remaining on the outer sides of both ends of the ink roller 10 is supplied to the inner peripheral surface of the plate cylinder 7, the plate cylinder 7 is moved after the ink replenishing roller 20 occupies the separation position. Is stopped, the right and left moving mechanism 28 is operated, and the plate cylinder 7 is returned to the initial position. Through this series of operations, all of the modified ink 30 remaining on the outer sides of both ends of the ink roller 10 is supplied to the used master, and the stencil printing apparatus enters a standby state. Thereafter, when a start key (not shown) is pressed after a new document is set in an image reading unit (not shown), the used master including the remaining ink 30 wound around the outer peripheral surface of the plate cylinder 7 is used. Is peeled off and the master 1 on which the plate-making image corresponding to the original image is formed is wound around the plate cylinder 7 and printing is performed.

  According to the configuration described above, the same effects as those of the first embodiment can be obtained without using the sheet 15 and the master 1, so that the sheet 15 and the master 1 can be obtained in addition to the effects of the first embodiment. Can reduce the cost.

  FIG. 8 shows a stencil printing apparatus applicable to the fourth and fifth embodiments of the present invention. This stencil printing apparatus is different from the stencil printing apparatus shown in FIG. 1 only in that an impression cylinder 31 is used instead of the press roller 16 and that a top-and-bottom movement mechanism 32 is used instead of the left-right movement mechanism 28. Other configurations are the same.

  Below the plate cylinder 7, it is substantially the same diameter as the plate cylinder 7, and is driven to rotate in synchronization with the plate cylinder 7 by transmitting a rotational driving force from a plate cylinder driving means (not shown) via the top and bottom moving mechanism 32. An impression cylinder 31 is disposed. The impression cylinder 31 has a notch on the outer peripheral surface, and a grip claw 33 for holding the paper 15 on the outer peripheral surface is provided in the notch so as to be openable and closable. The impression cylinder 31 is oscillated by an oscillating means (not shown), and the outer peripheral surface excluding the notch is configured to be able to contact and separate from the outer peripheral surface of the plate cylinder 7. The top and bottom moving mechanism 32 has a well-known configuration similar to the top and bottom moving means 39 and 45 disclosed in Japanese Patent Laid-Open No. 9-104158, and relatively compares the phases of the peripheral surfaces of the plate cylinder 7 and the impression cylinder 31. Move to.

  The operation of the above-described stencil printing apparatus will be described below. When a start key (not shown) is pressed after a document is set in an image reading unit (not shown), the plate cylinder 7 is rotated to the plate feeding position and stopped after the plate discharging operation by the plate discharging means 29 is performed. The clamper 14 is opened by the apparatus, and the stencil printing apparatus enters a plate feeding standby state.

  Thereafter, a plate making operation is performed in the plate making unit, and the tip of the master 1 on which the plate making image is formed is held on the outer peripheral surface of the plate cylinder 7. Thereafter, the plate cylinder 7 starts to rotate counterclockwise at substantially the same speed as the conveyance speed of the master 1 in FIG. 8, and the master 1 thus made is wound around the plate cylinder 7. When it is determined that the plate making for one plate has been completed, the master cutting means 5 is activated, the master 1 is cut, and the operation of the platen roller 2 and the master transport roller pair 4 is stopped. The cut master 1 is pulled out from the plate making section by the rotation of the plate cylinder 7, and the winding operation of the master 1 around the plate cylinder 7 is completed.

  When the winding operation is completed, the sheet feeding roller 17 rotates to pull out one sheet 15, and the pulled sheet P is temporarily stopped with its leading end held between the registration roller pair 18. The plate cylinder 7 is rotated at a low speed in the counterclockwise direction in FIG. 8 along with the operation of the sheet feeding unit, and the leading end of the image area in the plate cylinder rotation direction of the master 1 wound around the plate cylinder 7 is the impression cylinder 31. The registration roller pair 18 is rotationally driven at a predetermined timing immediately before reaching the contact portion. The sheet 15 fed by the rotation of the registration roller pair 18 is held on the outer peripheral surface of the impression cylinder 31 by the gripping claws 33, and is fed toward the contact portion with the plate cylinder 7 by the rotation of the impression cylinder 31. Then, the pressure cylinder 31 presses the peripheral surface thereof against the outer peripheral surface of the plate cylinder 7 by the operation of the swinging means (not shown), and the fed paper 15 is pressed against the master 1 on the plate cylinder 7. By this pressing, the ink supplied by the ink roller 10 is transferred from the inner peripheral surface of the plate cylinder 7 to the paper 15 through the opening portion, the mesh screen, and the punching portion of the master 1 and printing is performed. The paper 15 to which the print image has been transferred is sent to a paper discharge unit (not shown) after the gripping claws 33 are opened, and is discharged and stacked on a paper discharge tray (not shown). Prior to this printing operation, when the operator sets the print image position to be printed on the paper on the operation panel (not shown) to the top / bottom direction which is the plate cylinder rotation direction, the top / bottom movement mechanism 32 is activated to operate the plate cylinder. The peripheral surface of 7 and the peripheral surface of the impression cylinder 31 are relatively moved in the vertical direction by a set amount, and the image position printed on the paper 15 is changed in the vertical direction.

  In the above-described stencil printing apparatus, when a printing operation is performed for a long time without using the top-and-bottom movement mechanism 32, a reference pressure starting point (reference point) by the pressure drum 31 on the inner peripheral surface of the plate cylinder 7 as shown in FIG. The ink 30 remains in the upstream side in the plate cylinder rotation direction from the start point) and in the downstream side in the plate cylinder rotation direction from the reference pressure release point (reference release point) by the impression cylinder 31. In this state, when the printing operation is performed after operating the top and bottom moving mechanism 32 to change the printing position, the remaining denatured ink is supplied to the inner peripheral surface of the plate cylinder by the ink roller 10, and a good print image is obtained. A problem arises in that a plurality of defective print sheets must be discharged before they are obtained.

  Therefore, in the fourth embodiment of the present invention, the master 1 that has been subjected to plate making is wound around the plate cylinder 7, and the impression cylinder 31 is rotated while the plate cylinder 7 is rotated while the paper 15 is held on the peripheral surface of the impression cylinder 31. Is provided with an idling mode in which the plate cylinder 7 is pressed against the plate cylinder 7. This idling mode is automatically executed when the elapsed time from the previous printing exceeds a predetermined time set in advance by a timer (not shown) provided in the stencil printing apparatus. Hereinafter, the operation in the idling mode will be described.

  When a main power source (not shown) of the stencil printing apparatus is turned on, a timer (not shown) calculates an elapsed time from the previous printing, and the idling mode is executed when the elapsed time exceeds a predetermined time. In the idling mode, after the main power is turned on, the plate discharging means 29 is operated to peel off the used master from the outer peripheral surface of the plate cylinder 7. Thereafter, the plate making unit is operated to wind the master 1 around the plate cylinder 7. At this time, a preset plate making image is formed on the master 1. After completion of the winding operation, the top and bottom moving mechanism 32 is operated to move the plate cylinder 7 to either one of the top and bottom limit positions, and then the plate cylinder 7 and the impression cylinder 31 start to rotate. Then, the impression cylinder 31 is pressed against the peripheral surface of the plate cylinder 7 while the sheet 15 is held. As a result of this pressure contact, either the ink 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point or the downstream side in the plate cylinder rotation direction from the reference release point is pressed by the pressure drum 31 as shown in FIG. As a result, the image is transferred onto the paper 15 from the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the impression cylinder 31 via the paper 15 during the rotation.

  The plate cylinder 7 rotates a predetermined number of times, and any one of the ink 30 remaining on the upstream side of the plate cylinder rotation direction from the reference start point or the downstream side of the reference cylinder rotation direction from the reference release point is all the inner peripheral surface of the plate cylinder 7 , The plate cylinder 7 stops rotating. Thereafter, the top and bottom moving mechanism 32 is actuated again, and after the plate cylinder 7 is moved to one of the top and bottom limit positions, the impression cylinder 31 is placed on the peripheral surface of the plate cylinder 7 while holding the paper 15 as described above. Press contact. As shown in FIG. 11, either one of the inks 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point or the downstream side in the plate cylinder rotation direction from the reference release point is pressed by the pressure drum 31 as shown in FIG. 11. As a result, the image is transferred onto the paper 15 via the inner peripheral surface of the plate cylinder 7. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the impression cylinder 31 via the paper 15 during the rotation.

  The plate cylinder 7 rotates a predetermined number of times, and all the ink 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point and on the downstream side in the plate cylinder rotation direction from the reference release point passes through the inner peripheral surface of the plate cylinder 7. 15, after the rotation of the plate cylinder 7 is stopped, the top and bottom moving mechanism 32 is operated to return the plate cylinder 7 to the initial position. By this series of operations, all the modified ink 30 remaining on the upstream side of the plate cylinder rotation direction from the reference start point and the downstream side of the plate cylinder rotation direction from the reference release point is transferred to the paper 15, and the stencil printing apparatus is in a standby state. It becomes. Thereafter, when a new document is set in an image reading unit (not shown) and then a start key (not shown) is pressed, the idle mode master 1 wound around the outer peripheral surface of the plate cylinder 7 is peeled off and the document is released. The master 1 on which the plate-making image corresponding to the image is formed is wound around the plate cylinder 7 and printing is performed.

  According to the above configuration, all the modified ink 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point and the downstream side in the plate cylinder rotation direction from the reference release point is transferred to the paper 15, so that When printing is performed, printing can be performed in a state where there is no remaining modified ink 30 and a good print image can be obtained from the first sheet.

  Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, the master 1 in a plate-free state is wound around the plate cylinder 7, and the plate cylinder 7 is rotated while the sheet 15 is not held on the peripheral surface of the impression cylinder 31. 7 is provided with an idling mode for press-contacting to 7. Hereinafter, the operation in the idling mode will be described.

  When a main power source (not shown) of the stencil printing apparatus is turned on, a timer (not shown) calculates an elapsed time from the previous printing, and the idling mode is executed when the elapsed time exceeds a predetermined time. In the idling mode, after the main power is turned on, the plate discharging means 29 is operated to peel off the used master from the outer peripheral surface of the plate cylinder 7. Thereafter, the plate making unit is operated to wind the master 1 around the plate cylinder 7. At this time, the heating elements of the thermal head 3 are not energized, and the master 1 is made without plate making. After completion of the winding operation, the top and bottom moving mechanism 32 is operated to move the plate cylinder 7 to either one of the top and bottom limit positions, and then the plate cylinder 7 and the impression cylinder 31 start to rotate. Then, the pressure drum 31 is pressed against the peripheral surface of the plate cylinder 7 without holding the paper 15. By this pressure contact, either one of the ink 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point or the downstream side in the plate cylinder rotation direction from the reference release point is pressed by the pressure drum 31, thereby Supplied to the inner peripheral surface. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the impression cylinder 31 during this rotation.

  The plate cylinder 7 rotates a predetermined number of times, and any one of the ink 30 remaining on the upstream side of the plate cylinder rotation direction from the reference start point or the downstream side of the reference cylinder rotation direction from the reference release point is all the inner peripheral surface of the plate cylinder 7 , The rotation of the plate cylinder 7 stops. Thereafter, the top / bottom movement mechanism 32 is actuated again, and after the plate cylinder 7 is moved to the top or the other limit position, the impression cylinder 31 is placed on the circumferential surface of the plate cylinder 7 without holding the paper 15 as described above. Press contact. By this pressure contact, either one of the inks 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point or the downstream side in the plate cylinder rotation direction from the reference release point is pressed by the impression cylinder 31, thereby Supplied to the inner peripheral surface. The plate cylinder 7 rotates a predetermined number of times, and the plate cylinder 7 is pressed by the impression cylinder 31 during this rotation.

  The plate cylinder 7 rotates a predetermined number of times, and all the ink 30 remaining on the upstream side in the plate cylinder rotation direction from the reference start point and on the downstream side in the plate cylinder rotation direction from the reference release point is supplied to the inner peripheral surface of the plate cylinder 7. Then, after the rotation of the plate cylinder 7 is stopped, the top and bottom moving mechanism 32 is operated to return the plate cylinder 7 to the initial position. Through this series of operations, all of the modified ink 30 remaining on the upstream side of the plate cylinder rotation direction from the reference start point and the downstream side of the plate cylinder rotation direction from the reference release point is supplied to the master 1 in the non-plate-making state, and stencil printing is performed. The device enters a standby state. Thereafter, when a start key (not shown) is pressed after a new document is set in an image reading unit (not shown), a masterless master including the remaining ink 30 wound around the outer peripheral surface of the plate cylinder 7 is used. The master 1 on which the plate-making image corresponding to the original image is formed is peeled off and wound around the plate cylinder 7 for printing.

  According to the above-described configuration, the same effect as that of the fourth embodiment can be obtained without using the sheet 15, so that the cost for the sheet 15 is reduced in addition to the effect of the first embodiment. be able to. In the above-described fourth and fifth embodiments, the stencil printing apparatus having the ink replenishing roller 20 and the member that moves the stencil printing apparatus has been shown. However, a stencil printing apparatus that does not have these may be used. .

  In the first to fifth embodiments described above, each of the idle modes is automatically provided when an elapsed time from the previous printing exceeds a predetermined time by a timer (not shown) provided in the stencil printing apparatus. However, the present invention is applied to a stencil printing apparatus equipped with a power saving mode for turning off unnecessary displays to reduce power consumption when the apparatus is not operated for a predetermined time. The idling mode may be executed when the time exceeds a predetermined time shorter than the predetermined time during which the power saving mode functions.

It is a principal part schematic front view of the stencil printing apparatus which can apply the 1st thru | or 3rd embodiment of this invention. It is the schematic explaining the left-right moving mechanism used for the 1st thru | or 3rd embodiment of this invention. It is the schematic for demonstrating the problem in the conventional stencil printing apparatus which has a left-right moving mechanism. It is the schematic explaining the operation | movement of the idling mode in the 1st and 2nd embodiment of this invention. It is the schematic explaining the operation | movement of the idling mode in the 1st and 2nd embodiment of this invention. It is the schematic explaining the operation | movement of the idling mode in the 3rd Embodiment of this invention. It is the schematic explaining the operation | movement of the idling mode in the 3rd Embodiment of this invention. It is a principal part schematic front view of the stencil printing apparatus which can apply the 4th and 5th embodiment of this invention. It is the schematic for demonstrating the problem in the conventional stencil printing apparatus which has a top-and-bottom movement mechanism. It is the schematic explaining the operation | movement of the idling mode in the 4th and 5th embodiment of this invention. It is the schematic explaining the operation | movement of the idling mode in the 4th and 5th embodiment of this invention.

Explanation of symbols

7 Plate cylinder 10 Ink roller 15 Paper 16 Pressing means (press roller)
20 Ink replenishing roller 28 Left / right moving mechanism 31 Impression cylinder 32 Top / bottom moving mechanism

Claims (7)

A plate cylinder having an opening on the peripheral surface, an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, and the plate provided to be able to contact with and separate from the peripheral surface of the ink roller through the opening In a stencil printing machine comprising a pressing means for pressing paper against the outer peripheral surface of a cylinder, and a left-right moving mechanism for moving the opening in the axial direction of the plate cylinder,
An idle rotation in which the opening is moved in the axial direction from a reference position, a plate-making master is wound around the outer peripheral surface, and the pressing means is brought into contact with the outer peripheral surface without passing paper to rotate the plate cylinder. A stencil printing apparatus having a mode. A plate cylinder having an opening on the peripheral surface, an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, and the plate provided to be able to contact with and separate from the peripheral surface of the ink roller through the opening In a stencil printing machine comprising a pressing means for pressing paper against the outer peripheral surface of a cylinder, and a left-right moving mechanism for moving the opening in the axial direction of the plate cylinder,
An idling mode in which the opening portion is moved in the axial direction from a reference position, a plate making master is wound around the outer peripheral surface, and the pressing means is brought into contact with the outer peripheral surface in a paper state to rotate the plate cylinder. A stencil printing apparatus comprising: A plate cylinder having an opening on the peripheral surface, an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, an ink replenishing roller that contacts the inner peripheral surface and the peripheral surface of the ink roller, and the opening In a stencil printing apparatus provided with a left and right moving mechanism for moving the part in the axial direction of the plate cylinder,
An idle rotation mode in which the opening portion is moved in the axial direction from a reference position, and the plate cylinder is rotated in a non-sheet-passing state by bringing the ink replenishing roller into contact with the inner peripheral surface and the peripheral surface of the ink roller. A stencil printing apparatus characterized by that. A plate cylinder, a pressure cylinder that holds paper on the outer peripheral surface and presses the paper against the plate cylinder, and a top-and-bottom movement mechanism that moves a contact position between the plate cylinder and the pressure cylinder in the rotation direction of the plate cylinder. In the stencil printing machine provided,
An idling mode in which the contact position is moved from the reference position in the rotation direction, a plate-making master is wound around the outer peripheral surface, and the plate cylinder is rotated by bringing the impression cylinder into contact with the plate cylinder without passing paper. A stencil printing apparatus comprising: A plate cylinder, a pressure cylinder that holds paper on the outer peripheral surface and presses the paper against the plate cylinder, and a top-and-bottom movement mechanism that moves a contact position between the plate cylinder and the pressure cylinder in the rotation direction of the plate cylinder. In the stencil printing machine provided,
An idling mode in which the contact position is moved from the reference position in the rotation direction, a plate making master is wound around the outer peripheral surface, and the plate cylinder is rotated in contact with the plate cylinder while passing through the impression cylinder; A stencil printing apparatus characterized by that. In the stencil printing apparatus according to any one of claims 1 to 5,
The stencil printing apparatus, wherein the idling mode is executed when the apparatus is left for a predetermined time. In the stencil printing apparatus according to any one of claims 1 to 5,
When the device leaving time exceeds the first predetermined time, it shifts to a power saving mode in which unnecessary display is turned off, and the device leaving time exceeds a second predetermined time shorter than the first predetermined time. In this case, the idling mode is executed.

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