JP2005342946A - Stencil process printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil process printing device which can easily distinguish an image formed on an unprinted surface from an image formed on an already printed surface at the time of printing when a sheet with one surface already printed is used and also perform a one-side printing and a double-side printing work. <P>SOLUTION: In the stencil process printing device 1 which can selectively switch a printing operation to a double-side printing mode or a one-side printing mode, split masters 14X and 14Y already made up for a recycle mode with a real makeup image 14C and a false makeup image 14D formed thereon, are wound on a plate cylinder 11, and at the same time, the sheet with one surface already printed is loaded on a sheet supply tray 30 and the real makeup image 14C is transferred to the unprinted surface of the sheet. Further, the sheet with the transferred real makeup image 14C is guided to an auxiliary tray 8 by a guide member 10, then resupplied to a printing part 2 using a sheet resupply means 9. After that, the false makeup image 14D is transferred to the already printed surface of the sheet and the sheet is guided to a sheet discharge part 6 with the help of the guide member 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stencil printing apparatus, and more particularly to a stencil printing apparatus capable of switching between double-sided printing and single-sided printing using a divided master-making master in which two first and second plate-making images are arranged. .

  Conventionally, digital thermal stencil printing is known as a simple printing method. A stencil printing apparatus used for this stencil printing has a thermal head in which fine heat generating elements are arranged in a row in contact with the master and conveys the master while energizing the heat generating elements in a pulsed manner, so that the master according to the image information. After the master is wound around the outer peripheral surface of a porous cylindrical plate cylinder, the outer surface of the plate cylinder is pressed by pressing means such as a press roller through a sheet of paper, so that the ink is transferred from the master perforated portion. Is transmitted and transferred to a sheet of paper to obtain a printed image.

  In this stencil printing, in recent years, printing on an unprinted surface of a single-side printed paper has been frequently performed for the purpose of reducing paper consumption. However, in this case, since paper that has already been printed on one side is used, it is difficult to determine which side is newly printed on the printed paper. is there.

  In order to solve the above-described problems, when printing using single-sided printed paper, a printed image is formed on an unprinted surface and a predetermined image is formed on an already printed surface. A technique for distinguishing from the printed surface is disclosed in, for example, “Patent Document 1”. Further, when printing is performed using a single-side printed paper, the first printing unit that forms a printed image on the unprinted surface and the discrimination data are formed on the already printed surface in a color different from that of the first printing unit. For example, “Patent Document 2” discloses a technique that includes a second printing unit and distinguishes a newly printed surface from an already printed surface based on a difference in image color.

JP 11-34464 A JP 2003-11479 A

  However, in the technique disclosed in FIG. 1 of “Patent Document 1”, since two plate cylinders are arranged vertically and pressed against each other, the plate cylinders need to be pressed against each other even during single-sided printing. There is a master for pre-printing on one plate cylinder and an unprinted master on the other plate cylinder. There is a problem that it is consumed in vain. Further, in order to press the two plate cylinders each having a clamper for holding the master on the outer peripheral surface, it is necessary to separate the plate cylinders at positions where the clampers face each other. Since the area where the plate cylinders come into contact with each other decreases due to the separation, the image area is reduced. To secure the image area, it is necessary to increase the outer diameter of each plate cylinder, which makes it difficult to reduce the size of the apparatus. In addition, there is a problem that a large noise is generated when each plate cylinder is in contact.

  Further, in the technique disclosed in FIG. 4 of “Patent Document 2”, since the inkjet printing apparatus is provided on the downstream side of the stencil printing apparatus, the cost of the apparatus is increased and the inkjet is performed during normal one-side printing. There is a problem that it is necessary to remove the printing apparatus, and the operation is troublesome. Further, in the technique disclosed in FIG. 8, since two plate cylinders are arranged in series in the paper conveyance direction, the apparatus is nearly twice as large as a stencil printing apparatus for single-sided printing, and the installation space is reduced. In addition to difficulty in securing, there is a problem in that it is necessary to wind an unfinished master around one plate cylinder during normal single-sided printing, and the master is consumed wastefully.

  The present invention solves the above-mentioned problems, and can easily distinguish between an image formed on an unprinted surface and an image formed on an already printed surface at the time of printing using a single-side printed paper, It is an object of the present invention to provide a stencil printing apparatus that can perform normal single-sided printing and double-sided printing without using a useless master and can suppress an increase in installation space.

  According to the first aspect of the present invention, there is provided a printing unit having a plate cylinder and a pressing member provided so as to be able to contact with and separate from the plate cylinder, a sheet feeding unit having a sheet feeding tray on which sheets are stacked, and the printing unit. A paper discharge unit for discharging printed paper, an auxiliary tray for temporarily storing paper on which one side of the printing unit has a printed image, and paper stored on the auxiliary tray. A re-feeding unit that re-feeds the paper toward the printing unit; and a guide member that guides the paper that has passed through the printing unit to either the auxiliary tray or the paper discharge unit. A divided master-making master having a first master-making image and a second master-making image in the length direction is wound around the plate cylinder, and a master-making master on which a third master-making image for single-sided printing is formed at the time of single-side printing. Wrapped around the cylinder and after the surface printing process, the back side A stencil printing apparatus capable of switching between double-sided printing and single-sided printing for performing a printing process has a recycling mode in which printing is performed on an unprinted surface of a single-sided printed paper, and in the recycling mode, a first plate-making image Or the division | segmentation for recycling modes in which the real platemaking image which is an image which should be printed on either one of the 2nd platemaking image was formed, and the virtual platemaking image which was an image which displays that it was not a printing surface was formed in the other A master for making a plate is wound on the plate cylinder, and single-sided printed paper is stacked on the paper feed tray, and a printed image corresponding to the actual plate-making image is transferred to an unprinted side of the single-sided printed paper. Then, after guiding the auxiliary tray by the guide member, the paper is re-supplied by the re-feeding unit toward the printing unit, and the pre-printed surface of the one-side printed paper is applied to the false plate-making image. And performing a print operation to guide the discharge portion by the guide member after the printed image was transcribed.

  According to a second aspect of the present invention, there is provided a printing unit having a plate cylinder and a pressing member provided so as to be movable toward and away from the plate cylinder, a sheet feeding unit having a sheet feeding tray on which sheets are stacked, and the printing unit. A paper discharge unit for discharging printed paper, an auxiliary tray for temporarily storing paper on which one side of the printing unit has a printed image, and paper stored on the auxiliary tray. A re-feeding unit that re-feeds the paper toward the printing unit; and a guide member that guides the paper that has passed through the printing unit to either the auxiliary tray or the paper discharge unit. A divided master-making master having a first master-making image and a second master-making image in the length direction is wound around the plate cylinder, and a master-making master on which a third master-making image for single-sided printing is formed at the time of single-side printing. Wrapped around the cylinder and after the surface printing process, the back side A stencil printing apparatus capable of switching between double-sided printing and single-sided printing for performing a printing process has a recycling mode in which printing is performed on an unprinted surface of a single-sided printed paper, and in the recycling mode, a first plate-making image Or the division | segmentation for recycling modes in which the real platemaking image which is an image which should be printed on either one of the 2nd platemaking image was formed, and the virtual platemaking image which was an image which displays that it was not a printing surface was formed in the other A master for making a plate is wound around the plate cylinder, and a single-sided printed paper is stacked on the paper feed tray, and a printed image corresponding to the fictitious plate-making image is transferred to the preprinted surface of the single-sided printed paper. After guiding the auxiliary tray by the guide member, the paper is re-supplied toward the printing unit by the re-feed unit, and printing is performed on the unprinted surface of the single-side printed paper according to the actual plate-making image. And performing a printing operation for guiding the sheet discharge portion by the guide member after transferring the image.

  According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect of the present invention, the paper feeding unit further includes a preprinted surface and an unprinted surface of the one-side printed paper stacked on the paper feed tray. It has a detection means for detecting a surface, and has a control means for controlling the printing operation according to a detection result by the detection means.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, when the detection unit detects a single-side printed sheet on which both sides are already printed or both sides are not printed, the control unit The printing operation is stopped.

  According to the present invention, when a new printing is performed on an unprinted surface of a single-sided printed paper, an image newly formed on the unprinted surface is clearly distinguished from an image previously formed on the already printed surface. In addition, the printing operation can be performed continuously as in the case of double-sided printing, and the working efficiency can be improved.

  FIG. 1 shows a stencil printing apparatus that employs a first embodiment of the present invention. Since this stencil printing apparatus has substantially the same configuration as the double-sided printing apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-200355, description of each part is simplified as much as possible.

  1, a stencil printing apparatus 1 includes a printing unit 2, a plate making unit 3, a paper feeding unit 4, a plate discharging unit 5, a paper discharging unit 6, an image reading unit 7, an auxiliary tray 8, a refeed unit 9, a guide member 10, and the like. have.

  The printing unit 2 disposed almost at the center of the apparatus main body includes a plate cylinder 11 and a press roller 12 as a pressing member. The plate cylinder 11 is detachably and rotatably supported on the apparatus main body, and is driven to rotate by a plate cylinder driving means (not shown). The plate cylinder 11 has a clamper 13 that can be freely opened and closed on the outer peripheral surface thereof. On the outer peripheral surface of the plate cylinder 11, a divided pre-made master 14 made by the plate making unit 3 at the time of double-sided printing, and a plate making unit at the time of single-sided printing. The pre-made masters 15 made in step 3 are respectively wound. A rotary encoder (not shown) for detecting the position of the plate cylinder 11 is provided in the vicinity of the outer peripheral surface of the plate cylinder 11. In this embodiment, a plate-making master 15 capable of printing on A3 size paper at the maximum is wound around the plate cylinder 11.

  As shown in FIG. 2, the divided master-making master 14 is formed with a first master-making image 14A corresponding to the front image and a second master-making image 14B corresponding to the back surface image, and is not formed between the master-making images 14A and 14B. A plate making portion S is formed. In the divided plate-making master 14, on the plate cylinder 11, the first plate-making image 14A corresponds to the front surface area shown in FIG. 1, the second plate-making image 14B corresponds to the same back-surface area, and the non-plate-making portion S corresponds to the intermediate area. So that it is wound. In the present embodiment, as the first plate making image 14A and the second plate making image 14B, images that can be printed on a sheet having a size of A4 at the maximum (the width direction of the sheet is the sheet conveying direction) are created.

  As shown in FIG. 3, a third plate-making image 15 </ b> A corresponding to the single-side printed image is formed on the plate-making master 15. The plate-making master 15 is wound on the plate cylinder 11 so that the third plate-making image 15A corresponds to the combined range of the front surface region, the back surface region, and the intermediate region shown in FIG. In the present embodiment, an image that can be printed on a sheet of A3 size at the maximum is created as the third plate-making image 15A.

  Further, in the present invention, the stencil printing apparatus 1 has a recycle mode to be described later, and when this recycle mode is selected, as shown in FIG. A divided master-making master 14X for the recycle mode in which a virtual plate-making image 14D that is an image to be displayed is formed is created. An unmade part S is formed between the plate-making images 14C and 14D. In the present embodiment, as the plate-making images 14C and 14D, images that can be printed on a sheet of A4 horizontal size at the maximum are created. In addition, as the divided pre-made master for the recycle mode, the divided pre-made master 14Y shown in FIG. 5 in which the positions shown in FIG. 4 and the positions of the pre-made images 14C and 14D are switched may be created.

  A press roller 12 is disposed below the plate cylinder 11. Both ends of the press roller 12 made of an elastic material having water repellency such as fluororesin are rotatably supported by an arm member (not shown). The arm member (not shown) is swingably supported by a swing means (not shown). Yes. The press roller 12 selectively selects the separation position shown in FIG. 1 where the circumferential surface is separated from the plate cylinder 11 and the pressure contact position where the circumferential surface is pressed against the divided plate-making master 14 (during double-side printing) on the plate cylinder 11. Accounted for.

  The swinging means (not shown) has a pressing range of the press roller 12 against the plate cylinder 11 in the same range as the first range and the front range, which is a range in which the front area, the intermediate area, and the rear area shown in FIG. It is configured to be switchable to any one of a second range, a third range that is a range including the downstream portion of the front surface region, the intermediate region, and the back surface region. In the vicinity of the peripheral surface of the press roller 12, a cleaning roller 16 that performs cleaning by contacting the peripheral surface of the press roller 12 is disposed. The cleaning roller 16 is rotationally driven by a driving unit (not shown).

  Near the right side of the press roller 12, a refeed guide member 17 is provided for transporting the surface-printed paper P sent from the auxiliary tray 8 along the peripheral surface of the press roller 12. A re-feeding registration roller 18 is disposed below the press roller 12 and feeds the paper P stored on the auxiliary tray 8 in contact with the peripheral surface of the press roller 12. A refeed conveyance unit 19 having an auxiliary tray 8 on the upper surface is disposed on the lower left side of the press roller 12, and a refeed positioning member 20 is provided integrally therewith. A sheet receiving plate 21 that is movable along the upper surface of the auxiliary tray 8 is disposed above the refeed conveyance unit 19. The auxiliary tray 8, the refeed guide member 17, the refeed registration roller 18, the refeed positioning member 20, the refeed conveyance unit 19, and the sheet receiving plate 21 constitute a refeed unit 9.

  A guide member 10 is disposed on the conveyance path of the paper P on the left side of the contact position between the plate cylinder 11 and the press roller 12. The guide member 10 is rotatably supported by the apparatus main body at the downstream end portion in the sheet conveying direction, and is moved by a moving means (not shown), and the first position indicated by the solid line and the second dotted line indicated in FIG. 2 positions are selectively occupied. The paper P that has passed between the plate cylinder 11 and the press roller 12 is guided to the paper discharge unit 6 when the guide member 10 occupies the first position, and the guide member 10 occupies the second position. Is guided to the auxiliary tray 8.

  A plate making unit 3 is disposed on the upper right side of the printing unit 2. The plate making unit 3 includes a master holding member 23 that holds a master roll obtained by winding a master 22 in a roll shape, a platen roller 24, a thermal head 25, a master cutting unit 26, a master stock unit 27, a tension roller pair 28, and a reverse roller pair. 29, and the like. In the plate making unit 3, the divided plate-making master 14 at the time of duplex printing, the plate-making master 15 at the time of single-side printing, and the divided plate-making masters 14X and 14Y for the recycling mode at the recycling mode are used. Are created.

  A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 has a known configuration including a paper feed tray 30 on which the paper P is stacked, a paper feed roller, a separation roller, a separation pad, a registration roller pair, and the like.

  The plate discharging unit 5 disposed on the upper left side of the printing unit 2 also has a well-known configuration including an upper plate discharging member, a lower plate discharging member, a plate discharging box, a compression plate, and the like. 15. Separated masters 14X and 14Y for recycle mode are peeled off from the outer peripheral surface of the plate cylinder 11 and discarded inside the plate discharging box.

  A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 has a well-known configuration including a peeling claw, a paper discharge conveyance unit, a paper discharge tray, a peeling fan, and the like. The printed paper P is peeled off from the outer peripheral surface of the plate cylinder 11 and is placed on the paper discharge tray. To discharge.

  An image reading unit 7 is disposed on the upper part of the apparatus main body. Although not shown, the image reading unit 7 is a contact glass for placing a document, a pressure plate provided so as to be able to come in contact with and away from the contact glass, a reflection mirror and a fluorescent lamp for scanning and reading a document image, scanning A lens that focuses the focused image, an image sensor that processes the focused image, and the like.

  FIG. 5 shows an operation panel of the stencil printing apparatus 1. In the figure, the operation panel 31 includes a plate making start key 32, a printing start key 33, a stop key 34, a numeric key 35, a display device 36 including a 7-segment LED, a display device 37 including an LCD, and the like, as well as a double-sided structure. A double-sided printing key 38 that is pressed when performing printing, a single-sided printing key 39 that is pressed when performing single-sided printing, and a recycling mode setting key 40 that is pressed when setting the recycling mode during single-sided printing are provided. ing.

  FIG. 7 is a block diagram of control means used in the stencil printing apparatus 1. In the figure, a control means 41 is a microcomputer having a CPU, a ROM, a RAM, and the like inside, and based on an operation signal from a rotary encoder and an operation panel 31 (not shown), the printing unit 2, the plate making unit 3, and the paper feeding unit 4. The operation of the plate discharging unit 5, the paper discharge unit 6, the image reading unit 7, the refeed unit 9, and the guide member 10 is controlled.

Based on the configuration described above, the operation of the stencil printing apparatus 1 when performing duplex printing by pressing the duplex printing key 38 will be described below.
When a document is set in the image reading unit 7 and the duplex printing key 38 is pressed by the operator, the fact that duplex printing has been set is stored in the control means 41 and an operation program for duplex printing is called up. After that, when the plate making start key 32 is pressed by the operator, the image reading unit 7 performs the reading operation of the document image and the plate discharging unit 5 is operated to use the divided divided plate making master 14 used from the outer peripheral surface of the plate cylinder 11. Alternatively, the master-made master 15 is peeled off. After the plate removal, the plate making unit 3 is operated to form the first plate making image 14A and the second plate making image 14B on the master 22, and a new divided plate making master 14 is made, which is wound around the plate cylinder 11.

  After the winding operation is completed and the stencil printing apparatus 1 enters the duplex printing standby state, when the printing start key 33 is pressed by the operator after setting various printing conditions, the plate cylinder 11 is driven to rotate at the set speed. One sheet P is separated and fed from the sheet feeding unit 4. The fed paper P is temporarily stopped by a pair of registration rollers, and then sent between the plate cylinder 11 and the press roller 12 at a predetermined timing. The various printing conditions may be set before pressing the plate making start key 32.

  When the plate cylinder 11 is rotated to a predetermined angle and its surface area occupies a predetermined position corresponding to the press roller 12, the press roller 12 occupies the press contact position, whereby the sheet P is divided and made by master 14 on the plate cylinder 11. The first plate-making image 14A is pressed and the surface image is transferred to one surface thereof. At this time, the swinging means (not shown) that swings the press roller 12 sets the pressing range of the press roller 12 against the plate cylinder 11 to the second range.

  The paper P that has been printed on the front surface is peeled off from the outer peripheral surface of the plate cylinder 11 by the tip of the guide member 10 occupying the second position, and is sent to the refeed conveyance unit 19. At this time, the front end of the paper P is received by the paper receiving plate 21 and is placed on the auxiliary tray 8 from the rear end side. The paper P on the auxiliary tray 8 is transported in the direction of the arrow in FIG. 1 by the paper refeeding transport unit 19, and is temporarily stopped with its leading end abutting against the paper refeeding positioning member 20.

  The plate cylinder 11 continues to rotate while the first sheet P is guided onto the auxiliary tray 8, and the second sheet is fed from the sheet feeding unit 4 at the same timing as the first sheet P. P is fed. At this time, the swinging means (not shown) sets the pressing range of the press roller 12 against the plate cylinder 11 to the first range. Similarly to the first sheet P, the second sheet P that has been fed has a surface image transferred to one surface thereof by the press roller 12 and is then re-transferred by the guide member 10 that occupies the second position. It is sent to the paper feeding / conveying unit 19.

  After the second sheet P is fed from the sheet feeding unit 4, the re-feeding registration roller 18 is operated at a slightly earlier timing than the back surface area of the plate cylinder 11 reaches the position corresponding to the press roller 12. Then, the first sheet P stored on the auxiliary tray 8 is pressed against the peripheral surface of the press roller 12. The first sheet P pressed against the peripheral surface of the press roller 12 is conveyed toward the contact portion with the plate cylinder 11 by the rotational force of the press roller 12 that is pressed against the plate cylinder 11 and rotated. The back image is transferred to the other surface by being pressed against the second plate-making image 14B of the divided plate-making master 14.

  The first sheet P, which has been printed on both sides with the back side image transferred, is guided to the paper discharge unit 6 by the guide member 10 occupying the first position, and the leading end is blown by the air blown from the peeling fan. After being lifted, it is peeled off from the outer peripheral surface of the plate cylinder 11 by the tip of the peeling claw. The peeled printed paper P is sent to the paper discharge transport unit, and then transported and discharged and stacked on the paper discharge tray. Thereafter, the above operation is repeated until the set number of printed sheets is consumed, and after the final sheet P is guided onto the auxiliary tray 8, the swinging means (not shown) sets the pressing range of the press roller 12 against the plate cylinder 11. When the two-sided printing operation for the set number of sheets is completed, the operation of each part is stopped.

Next, the operation of the stencil printing apparatus 1 when normal single-sided printing is performed by pressing the single-sided printing key 39 will be described.
When an original is set in the image reading unit 7 and the single-sided printing key 39 is pressed by the operator, the fact that single-sided printing has been set is stored in the control means 41 and an operation program for single-sided printing is called up. After that, when the plate making start key 32 is pressed by the operator, the image reading unit 7 performs the reading operation of the document image and the plate discharging unit 5 is operated to use the divided divided plate making master 14 used from the outer peripheral surface of the plate cylinder 11. Alternatively, the master-made master 15 is peeled off. After the plate removal, the plate making unit 3 is operated to form a third plate making image 15A on the master 22 and a new plate making master 15 is made, which is wound around the plate cylinder 11.

  After the winding operation is completed and the stencil printing apparatus 1 enters the single-sided printing standby state, when the printing start key 33 is pressed by the operator after setting various printing conditions, the plate cylinder 11 is driven to rotate at the set speed. One sheet P is separated and fed from the sheet feeding unit 4. The fed paper P is temporarily stopped by a pair of registration rollers, and then sent between the plate cylinder 11 and the press roller 12 at a predetermined timing.

  When the plate cylinder 11 is rotated to a predetermined angle and the surface area occupies a position corresponding to the press roller 12, the press roller 12 occupies the press contact position, so that the sheet P becomes the first of the pre-made master 15 on the plate cylinder 11. The three plate-making images 15A are pressed and transferred. At this time, the swinging means (not shown) that swings the press roller 12 sets the pressing range of the press roller 12 against the plate cylinder 11 to the first range.

  After the image P is transferred to the printed sheet P, the sheet P is guided to the paper discharge unit 6 by the guide member 10 occupying the first position, and the leading end is lifted by the air blown from the peeling fan. It is peeled off from the outer peripheral surface of the plate cylinder 11 by the tip of the peeling claw. The peeled printed paper P is sent to the paper discharge transport unit, and then transported and discharged and stacked on the paper discharge tray. Thereafter, the above operation is repeated until the set number of printed sheets is consumed, and when the set number of single-sided printing operations are completed, the operation of each part is stopped.

Next, the operation of the stencil printing apparatus 1 when performing single-sided printing in the recycle mode will be described.
When an original is set in the image reading unit 7 and the single-sided printing key 39 is pressed by the operator, the fact that single-sided printing has been set is stored in the control means 41 and an operation program for single-sided printing is called up. Thereafter, when the recycle mode setting key 40 is pressed, the operation program is changed to an operation program for the recycle mode.

  When the plate making start key 31 is pressed by the operator after the single-side printed paper P is set on the paper feed tray 30, the image reading unit 7 performs a reading operation and the plate discharging unit 5 performs a plate discharging operation. . After the plate removal, the plate making operation in the recycle mode is performed. In this embodiment, the single-side printed paper P is stacked on the paper feed tray 30 after being aligned by an operator so that the upper surface is an unprinted surface and the lower surface is an already printed surface.

  In the plate-making operation in the recycle mode, the divided plate-making master 14X or 14Y for the recycle mode is created, and the created divided plate-made master 14X or 14Y is wound around the plate cylinder 11. In this embodiment, it is assumed that the divided plate-making master 14X is wound around the plate cylinder 11. After the winding operation is completed and the stencil printing apparatus 1 enters the single-sided printing standby state, when the printing start key 33 is pressed by the operator after setting various printing conditions, the plate cylinder 11 is driven to rotate at the set speed. One-side printed paper P is separated and fed from the paper feeding unit 4. The fed single-side printed paper P is temporarily stopped by a pair of registration rollers, and then sent between the plate cylinder 11 and the press roller 12 at a predetermined timing.

  When the plate cylinder 11 rotates to a predetermined angle and the surface area occupies a position corresponding to the press roller 12, the unprinted surface of the paper P on which single-side printing has been performed is caused by the press roller 12 occupying the press contact position. The image is transferred by being pressed against the actual plate-making image 14C of the divided plate-making master 14X. At this time, the swinging means (not shown) that swings the press roller 12 sets the pressing range of the press roller 12 against the plate cylinder 11 to the second range.

  The single-side printed paper P with the image transferred to the unprinted surface is peeled off from the outer peripheral surface of the plate cylinder 11 by the guide member 10 occupying the second position, and sent to the auxiliary tray 8. The single-side printed paper P on the auxiliary tray 8 is transported in the direction of the arrow in FIG. 1 by the refeeding transport unit 19, and is temporarily stopped with its leading end in contact with the refeeding positioning member 20.

  The plate cylinder 11 continues to rotate while the first single-side printed paper P is guided to the auxiliary tray 8, and the second single-side printed paper P is fed from the paper supply unit 4. Sent. At this time, the swinging means (not shown) sets the pressing range of the press roller 12 against the plate cylinder 11 to the first position. Similarly to the first sheet, the second sheet P having been printed on one side is transferred by the press roller 12 onto the upper surface thereof, and then the guide plate 10 occupying the second position is transferred by the guide member 10 occupying the second position. It is sent to the re-feed conveyance unit 19.

  After the second single-side printed sheet P is fed from the sheet feeding unit 4, the sheet re-feeding resist is a little earlier than when the back surface area of the plate cylinder 11 reaches the position corresponding to the press roller 12. The roller 18 is operated and the first single-side printed paper P stored on the auxiliary tray 8 is pressed against the peripheral surface of the press roller 12. The first single-side printed paper P pressed against the circumferential surface of the press roller 12 is brought into contact with the plate cylinder 11 by the rotational force of the press roller 12 that is pressed against the plate cylinder 11 and is driven to rotate. Then, the virtual plate-making image is transferred onto the printed surface by being pressed against the virtual plate-making image 14D of the divided plate-making master 14X.

  The first single-side printed paper P on which the real plate image 14C is transferred to the non-printed surface and the virtual plate image 14D is transferred to the pre-printed surface and printed in the recycle mode is occupied by the first position. It is guided to the paper discharge unit 6 by the member 10, transported to the paper discharge transport unit, and discharged onto the paper discharge tray. Thereafter, the above-described operation is repeated until the set number of printed sheets is exhausted, and after the final single-side printed paper P is guided onto the auxiliary tray 8, a swinging means (not shown) is applied to the plate cylinder 11 of the press roller 12. When the pressing range is set to the third range and the set number of printing operations are completed, the operation of each part is stopped.

  In the above-described embodiment, the divided master-making master 14X is used in the recycle mode, and the single-side printed paper P is set on the paper feed tray 30 so that the unprinted surface is the upper surface side. A configuration in which the pre-printed master 14X is used and the single-side printed paper P is set on the paper feed tray 30 so that the pre-printed surface is on the upper surface side, the split pre-made master 14Y is used and the single side is printed on the paper feed tray A configuration in which the printed paper P is set so that the unprinted surface is on the upper surface side, the divided plate-making master 14Y is used, and the single-side printed paper P is placed on the paper feed tray 30 with the already printed surface on the upper surface side. It is good also as a structure set so that it may become.

  With the above-described configurations, when printing in the recycle mode using the single-side printed paper P, the transfer of the actual plate-making image and the virtual plate image onto the single-side printed paper P is performed in the same manner as in double-sided printing. It is possible to continuously perform the transfer of the print image onto the single-side printed paper and the transfer of the virtual plate image for distinguishing the unprinted surface and the already printed surface.

  According to the first embodiment described above, when a new printing is performed on the unprinted surface of the single-side printed paper P, an image newly formed on the unprinted surface and an image formed in advance on the printed surface. Can be clearly distinguished from each other, and this printing operation can be performed continuously as in the case of double-sided printing, so that work efficiency can be improved. However, the single-side printed paper P needs to be set in one direction with respect to the paper feed tray 30 (the unprinted side of all the papers have the same direction), which is troublesome. Therefore, a configuration in which the same effect can be obtained even when the single-side printed paper P is randomly stacked on the paper feed tray 30 will be described below as a second embodiment.

  FIG. 8 shows a stencil printing apparatus used in the second embodiment of the present invention. The stencil printing device 42 is different from the stencil printing device 1 shown in the first embodiment in that the paper feed unit 4 has sensors 43 and 44 as detection means, and a control means 45 instead of the control means 41. Is different only in the point of using, and the other configurations are the same.

  The sensor 43 is disposed downstream of the separation roller and separation pad in the sheet conveyance direction and on the upper surface side of the sheet P, and the sensor 44 is disposed at a position facing the sensor 43 across the sheet conveyance path. Each of the sensors 43 and 44 is a reflection type sensor that detects whether or not an image is formed on the surface of the paper P, and the detection result from each of the sensors 43 and 44 is sent to the control means 45.

  FIG. 9 is a block diagram of control means used in the stencil printing apparatus 42. In the figure, a control means 45 is a microcomputer having a CPU, ROM, RAM, etc. therein, and is based on the rotary encoder and operation panel 31 (not shown) and operation signals from the sensors 43 and 44, the printing unit 2, and the plate making unit. 3, the operations of the sheet feeding unit 4, the plate discharging unit 5, the sheet discharging unit 6, the image reading unit 7, the refeed unit 9, and the guide member 10 are controlled.

  Based on the above configuration, the operation of the stencil printing apparatus 42 in the second embodiment will be described below. In this stencil printing apparatus 42, the double-sided printing operation and the normal single-sided printing operation are performed in the same manner as the above-described stencil printing apparatus 1, and therefore only the single-sided printing operation in the recycle mode will be described here.

  After the original is set in the original reading unit 7 and the single-side printed paper P is set on the paper supply tray 30, the single-sided printing key 39 and the recycle mode setting key 40 are sequentially pressed by the operator, and then the plate making start key When 31 is pressed, a reading operation is performed in the image reading unit 7, a plate discharging operation is performed in the plate discharging unit 5, and then a plate making operation in the recycle mode is performed. In the present embodiment, the single-side printed paper P is stacked on the paper feed tray 30 in a random state (the orientation of the unprinted surface may be different for each sheet).

  In the plate making operation, a divided plate-making master 14X or 14Y is created, and the created divided plate-making master 14X or 14Y is wound around the plate cylinder 11. In the present embodiment, it is assumed that the divided plate-making master 14X is wound around the plate cylinder 11. After the winding operation is completed and the stencil printing device 42 enters the single-sided printing standby state, when the printing start key 33 is pressed by the operator after setting various printing conditions, the plate cylinder 11 is driven to rotate at the set speed. One-side printed paper P is separated and fed from the paper feeding unit 4. The single-side printed paper P that has been separated and fed passes through the contact portion between the separation roller and the separation pad, and then the surface on which the image is present is detected by the sensors 43 and 44. Then, the single-side printed paper P that has been separated and fed is temporarily stopped with its leading end in contact with the registration roller pair.

  Based on information from the sensors 43 and 44, the control unit 45 determines which side of the paper P to be fed is an unprinted side, and controls the printing operation of the stencil printing device 42 accordingly. . For example, when a signal with an image is sent from the sensor 43 and a signal without an image is sent from the sensor 44, it is determined that the upper surface of the paper P is an already printed surface and the lower surface is an unprinted surface, and is not shown. The pressing range of the press roller 12 against the plate cylinder 11 is switched to the third range by the swinging means. Thereafter, the registration roller pair is operated at a predetermined timing, and the single-side printed paper P is fed between the plate cylinder 11 and the press roller 12.

  When the plate cylinder 11 rotates to a predetermined angle and the back surface area occupies a position corresponding to the press roller 12, the pre-printed surface of the single-side printed paper P becomes the plate cylinder 11 because the press roller 12 occupies the press contact position. The master plate image 14D of the divided master plate master 14X is pressed against the master plate image 14D, and the master plate image 14D is transferred onto the single-side printed paper P.

  The single-side printed paper P having the image transferred to the already printed surface is peeled off from the outer peripheral surface of the plate cylinder 11 by the guide member 10 occupying the second position, and sent to the auxiliary tray 8. The single-side printed paper P on the auxiliary tray 8 is conveyed in the direction of the arrow in FIG. 8 by the refeed conveyance unit 19 and is temporarily stopped with its leading end abutting against the refeed positioning member 20.

  The plate cylinder 11 continues to rotate while the first single-side printed paper P is guided to the auxiliary tray 8, and the second single-side printed paper P is fed from the paper supply unit 4. Sent. Similarly to the first single-side printed paper P, the single-side printed paper P that has been separated and fed is detected on which side the image is present by the sensors 43 and 44. Then, the single-side printed paper P that has been separated and fed is temporarily stopped with its leading end in contact with the registration roller pair.

  The control unit 45 determines which side of the second printed sheet P is an unprinted side based on information from the sensors 43 and 44, and according to this, the printing operation of the stencil printing device 42 is performed. To control. For example, as in the case of the first sheet, when a signal with an image is sent from the sensor 43 and a signal without an image is sent from the sensor 44, the upper surface of the paper P is the printed surface and the lower surface is the unprinted surface. Judge. In this case, since the first single-side printed paper P already stored on the auxiliary tray 8 and the fed second single-side printed paper P have the same orientation, the first one The single-side printed paper P and the second single-side printed paper P can be processed in one stroke.

  The control means 45 switches the pressing range of the press roller 12 against the plate cylinder 11 to the first range by a swing means (not shown), and is slightly earlier than the surface area of the plate cylinder 11 reaches a position corresponding to the press roller 12. Thus, the re-feeding registration roller 18 is operated to press the first single-side printed paper P stored on the auxiliary tray 8 against the peripheral surface of the press roller 12. The first single-side printed paper P pressed against the peripheral surface of the press roller 12 is sent to the vicinity of the contact portion between the plate cylinder 11 and the press roller 12 by the transport force of the refeed transport unit 19, and thereafter When the press roller 12 swings and presses against the plate cylinder 11, the actual plate-making image 14C of the divided plate-making master 14X is transferred to the unprinted surface.

  The first single-side printed paper P on which the real plate image 14C is transferred to the non-printed surface and the virtual plate image 14D is transferred to the pre-printed surface and printed in the recycle mode is occupied by the first position. It is guided to the paper discharge unit 6 by the member 10, transported to the paper discharge transport unit, and discharged onto the paper discharge tray. At this time, the registration roller pair is operated at the timing when the back surface area of the plate cylinder 11 reaches the position corresponding to the press roller 12, and the second sheet of single-side printed paper P is fed. The fed single-side printed sheet P is pressed against the plate cylinder 11 by the press roller 12, and after the virtual plate image 14D is transferred to the upper surface thereof, the guide member 10 occupying the second position is used. It is peeled off from the outer peripheral surface of the plate cylinder 11 and sent to the auxiliary tray 8.

  During the above-described operation, when the control unit 45 detects the state of the second single-side printed paper P based on the signals from the sensors 43 and 44, unlike the first sheet, there is no image from the sensor 43. When an image presence signal is sent from the sensor 44, it is determined that the upper surface of the paper P is an unprinted surface and the lower surface is an already printed surface. In this case, since the first single-side printed sheet P already stored on the auxiliary tray 8 and the fed second single-side printed sheet P are in different directions, the first sheet The single-side printed paper P and the second single-side printed paper P cannot be processed in one stroke. In this case, first, the printing operation of the first single-side printed paper P stored in the auxiliary tray 8 is performed first.

  The control means 45 switches the pressing range of the press roller 12 against the plate cylinder 11 by a swing means (not shown) to the second range, and is slightly earlier than the surface area of the plate cylinder 11 reaches a position corresponding to the press roller 12. Thus, the re-feeding registration roller 18 is operated to press the first single-side printed paper P stored on the auxiliary tray 8 against the peripheral surface of the press roller 12. The first single-side printed paper P pressed against the peripheral surface of the press roller 12 is sent to the vicinity of the contact portion between the transport 11 and the press roller 12 by the transport force of the refeed transport unit 19 and then pressed. As the roller 12 swings and presses against the plate cylinder 11, the actual plate-making image 14C of the divided plate-making master 14X is transferred to the unprinted surface.

  The first single-side printed paper P on which the real plate image 14C is transferred to the non-printed surface and the virtual plate image 14D is transferred to the pre-printed surface and printed in the recycle mode is occupied by the first position. It is guided to the paper discharge unit 6 by the member 10, transported to the paper discharge transport unit, and discharged onto the paper discharge tray. At this time, the second single-side printed paper P separated and fed from the paper feeding unit 4 is maintained in a state of being temporarily stopped by the registration roller pair.

  After the first single-side printed paper P is discharged, the registration roller pair is activated at the timing when the surface area of the plate cylinder 11 reaches the position corresponding to the press roller 12 by the next rotation, and the second single-sided printing is performed. Used paper P is fed. The fed single-side printed sheet P is pressed against the plate cylinder 11 by the press roller 12, and after the actual plate-making image 14C is transferred to the upper surface thereof, the guide member 10 occupying the second position is used. It is peeled off from the outer peripheral surface of the plate cylinder 11 and sent to the auxiliary tray 8. While the second single-side printed paper P is guided to the auxiliary tray 8, the third single-side printed paper P is fed from the paper feeding unit 4, and each sensor 43, 44 determines which side. The presence of an image is detected. Then, the single-side printed paper P that has been separated and fed is temporarily stopped with its leading end in contact with the registration roller pair.

  Thereafter, the above-described operation is repeated up to the set number of sheets, and when the set number of printed sheets is consumed, the operation of each part is stopped and the stencil printing apparatus 42 enters a print standby state. According to this configuration, when printing is newly performed on the unprinted surface of the paper P that has been printed on one side, regardless of the orientation of the paper P that has been printed on the single side stacked on the paper feed tray 30, Can be clearly distinguished from the image formed in advance on the already printed surface, and this printing operation can be performed continuously in the same way as in double-sided printing depending on the orientation of the single-side printed paper P. This can be done and work efficiency can be improved.

  In the above-described second embodiment, the printing operation of the stencil printing apparatus 42 may be stopped when the detection signals from the sensors 43 and 44 both have an image and / or no image. With this configuration, when the double-side printed paper P is mistakenly stacked on the paper feed tray 30, the actual plate image 14C is transferred to any of the printed surfaces of the paper P, and the image cannot be discriminated. When the double-sided unprinted paper P is erroneously stacked on the paper feed tray 30, the fake plate image 14D is transferred to the unprinted surface of the paper P, and the single-sided printed paper is obtained. It is possible to simultaneously prevent the occurrence of a problem that the reuse becomes impossible.

1 is a schematic front view of a stencil printing apparatus to which the first embodiment of the present invention can be applied. It is the schematic which shows the division | segmentation plate-making completed master used for the 1st and 2nd embodiment of this invention. It is the schematic which shows the plate-making completed master used for the 1st and 2nd embodiment of this invention. It is the schematic which shows the division | segmentation plate-making completed master for recycle modes used for the 1st and 2nd embodiment of this invention. It is the schematic which shows the division | segmentation plate-making completed master for recycle modes used for the 1st and 2nd embodiment of this invention. It is the schematic of the operation panel used for the 1st and 2nd embodiment of this invention. It is a block diagram of the control means used for the 1st Embodiment of this invention. It is a schematic front view of the stencil printing apparatus which can apply the 2nd Embodiment of this invention. It is a block diagram of the control means used for the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,42 Stencil printing apparatus 2 Printing part 4 Paper feed part 6 Paper discharge part 8 Auxiliary tray 9 Refeed means 10 Guide member 11 Plate cylinder 12 Press member (press roller)
14 Master plate 14A First master image 14B Second master image 14C Master plate image 14D Fake master image 14X, 14Y Split master for recycling mode 15 Master master 15A Third master image 30 Paper feed tray 43, 44 Detection means (sensor)
45 Control means P Paper

Claims (4)

A printing unit having a plate cylinder and a pressing member provided so as to be able to contact with and separate from the plate cylinder, a paper feeding unit having a paper feeding tray for stacking paper, and paper discharged on the printing unit are discharged. A paper discharge unit that performs storage, an auxiliary tray that temporarily stores paper on which one of the print images is formed in the printing unit, and paper that is stored on the auxiliary tray is re-supplied toward the printing unit. A sheet re-feeding unit; and a guide member that guides the sheet that has passed through the printing unit to either the auxiliary tray or the sheet discharge unit. And the second plate-making image are wound around the plate cylinder, and at the time of single-sided printing, the plate-making master on which a third plate-making image for single-sided printing is formed is wound around the plate cylinder, Double-sided printing with backside printing process after printing process In the stencil printing apparatus capable of performing switching between single-sided printing,
There is a recycle mode in which printing is performed on an unprinted side of a single-sided printed paper, and in the recycle mode, an actual plate-making image that is an image to be printed is formed on either the first plate-making image or the second plate-making image. And a recycle mode divided pre-printed master on which a virtual plate image, which is an image indicating that the other side is not a printing surface, is wound on the plate cylinder and printed on one side on the paper feed tray A sheet is stacked, and a printed image corresponding to the actual plate-making image is transferred to an unprinted surface of the one-side printed sheet and guided to the auxiliary tray by the guide member. Performing a printing operation in which the guide member guides the paper discharge unit after the printed image corresponding to the fake plate image is transferred to the already printed surface of the one-side printed paper. Stencil printing machine according to claim. A printing unit having a plate cylinder and a pressing member provided so as to be able to contact with and separate from the plate cylinder, a paper feeding unit having a paper feeding tray for stacking paper, and paper discharged on the printing unit are discharged. A paper discharge unit that performs storage, an auxiliary tray that temporarily stores paper on which one of the print images is formed in the printing unit, and paper that is stored on the auxiliary tray is re-supplied toward the printing unit. A sheet re-feeding unit; and a guide member that guides the sheet that has passed through the printing unit to either the auxiliary tray or the sheet discharge unit. And the second plate-making image are wound around the plate cylinder, and at the time of single-sided printing, the plate-making master on which a third plate-making image for single-sided printing is formed is wound around the plate cylinder, Double-sided printing with backside printing process after printing process In the stencil printing apparatus capable of performing switching between single-sided printing,
There is a recycle mode in which printing is performed on an unprinted side of a single-sided printed paper, and in the recycle mode, an actual plate-making image that is an image to be printed is formed on either the first plate-making image or the second plate-making image. And a recycle mode divided pre-printed master on which a virtual plate image, which is an image indicating that the other side is not a printing surface, is wound on the plate cylinder and printed on one side on the paper feed tray After the sheets are stacked, the printed image corresponding to the fake plate image is transferred to the already printed surface of the one-side printed paper, and guided to the auxiliary tray by the guide member, and then directed to the printing unit by the refeeding unit. And then performing a printing operation in which the guide member guides the paper discharge unit after the printed image corresponding to the actual plate-making image is transferred to the unprinted surface of the one-side printed paper. That the stencil printing machine. In the stencil printing apparatus according to claim 1 or 2,
The paper feeding unit has a detecting unit that detects a printed surface and an unprinted surface of the single-side printed paper stacked on the paper feeding tray, and performs the printing operation according to a detection result by the detecting unit. A stencil printing apparatus comprising control means for controlling. In the stencil printing apparatus according to claim 3,
2. The stencil printing apparatus according to claim 1, wherein when the detecting unit detects a single-sided printed sheet on which both sides are already printed or both sides are not printed, the control unit stops the printing operation.

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