JP2008221515A - Stencil printing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printing equipment, which can execute a process perfecting by moving the position of each image axially along a plate cylinder with neither re-makeup a master nor worsen the workability of printing equipment. <P>SOLUTION: In the stencil printing equipment, which has a plate cylinder 11 axially movable during rotation and, in which, after the execution of the front printing process for printing a front image on one side of paper P transported from a paper feeding part 4, the rear printing process for printing a rear image on the other side is executed for perfecting by re-feed the paper P, the positions of the front surface image and of the rear image are respectively made movably axially by axially moving respective plate cylinders 11 before the execution of the front surface printing process and of the rear surface printing process at perfecting. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stencil printing apparatus that performs printing by winding a master around a plate cylinder, and more particularly to a stencil printing apparatus that can perform double-sided printing in one step.

  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 described above, duplex printing has recently been frequently performed in which printing is performed on both sides of a sheet for the purpose of reducing the amount of paper consumed and the storage space for documents. As an example of this, a divided pre-printed master in which the first plate-making image and the second plate-making image are arranged in two directions in the direction of rotation of the plate cylinder is used. After the plate-making image is printed, this paper is guided to the auxiliary tray, and after one plate-making image is printed on the surface of the second sheet fed from the paper feeding unit, this paper is guided to the auxiliary tray, and the auxiliary tray The first sheet is re-feeded from the tray, the other plate-making image is printed on this back surface, the sheet is discharged from the sheet discharge tray, and this operation is continuously performed to obtain a double-sided printed matter in one step. A stencil printing apparatus is disclosed in, for example, “Patent Document 1”.

JP 2004-196476 A

In the stencil printing apparatus disclosed in “Patent Document 1”, the position of the front image and the back image printed on the paper can be individually adjusted by a predetermined amount in the paper conveyance direction. Cannot be adjusted. For this reason, in order to move each image in the plate cylinder axis direction, the position of each image is shifted in advance in the plate cylinder axis direction when the image is read, or the paper is supplied in a state shifted in advance in the plate cylinder axis direction. Paper is necessary and workability is poor. In addition, the front image and the back image cannot be moved to different sides of the plate cylinder axis direction, and in order to realize this, there is a problem that the master must be re-made.
The present invention solves the above-described problems, and can perform one-step double-sided printing by moving the position of each image in the plate cylinder axis direction without remaking the master or deteriorating workability. An object is to provide a printing apparatus.

  The invention described in claim 1 has a plate cylinder, and after performing a surface printing process for printing a surface image on one surface of the paper fed from the paper feeding unit, the paper is fed again to the other side. In the stencil printing apparatus capable of double-sided printing, which performs a backside printing step for printing a backside image on the surface of the plate, the plate cylinder is movable in the axial direction during rotation, and the front side printing step and the back side during double sided printing Before the printing step, the plate cylinder is moved in the axial direction, and the positions of the front surface image and the back surface image can be moved in the axial direction.

  According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the plate cylinder is further moved from the reference position by a predetermined amount in the axial direction based on the positions of the front surface image and the back surface image printed on the paper. It is characterized by that.

  According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect, the plate cylinder is further provided between the front surface printing step and the rear surface printing step and between the rear surface printing step and the front surface printing step. , And the plate cylinder is moved in the axial direction during the idle rotation.

  According to a fourth aspect of the present invention, after performing a front surface printing step of printing a front surface image on one side of the paper fed from the paper feed unit, the paper is re-fed and the back side image is placed on the other side. In a stencil printing apparatus having a plate cylinder on which a master on which a front plate image corresponding to the front surface image and the back surface image is formed is capable of performing double-sided printing for performing a back surface printing process, the plate cylinder is being rotated. Plate cylinder moving means for moving in the axial direction thereof, and control means for controlling the operation of the plate cylinder moving means, the control means before the front surface printing step and the back surface printing step at the time of duplex printing. The plate cylinder moving means is operated to move the plate cylinder in the axial direction, and the positions of the front and back images can be adjusted in the axial direction.

  According to a fifth aspect of the present invention, in the stencil printing apparatus according to the fourth aspect, the plate cylinder moving means further includes a stepping motor.

  According to the present invention, the positions of the front surface image and the back surface image formed on the paper can be arbitrarily set in the direction orthogonal to the paper transport direction, so that the master can be remade or the workability can be deteriorated. Thus, the front image and the back image can be arranged at desired positions on the paper.

    In FIG. 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, a refeed unit 9 having an auxiliary tray 8, and a switching member 10. Etc.

  The printing unit 2 disposed almost at the center of the apparatus main body 42 includes a plate cylinder 11 and a press roller 12. The plate cylinder 11 is rotatably supported by the apparatus main body 42 and is driven to rotate by a plate cylinder driving means (not shown). The plate cylinder 11 has an openable / closable clamper 13 on the outer peripheral surface thereof, and the divided pre-made master 14 made by the plate making unit 3 is wound around the outer peripheral surface of the plate cylinder 11 at the time of duplex printing. The divided master-making master 14 is formed with a first master-making image corresponding to the front image and a second master-making image corresponding to the back image, and an un-made part is formed between the master-making images. On the plate cylinder 11, the divided plate-making master 14 is wound so that the first plate-making image corresponds to the front surface region shown in FIG. 1, the second plate-making image corresponds to the same back surface region, and the non-plate making portion corresponds to the same intermediate region. Be dressed. 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.

  A plate cylinder moving means 15 for moving the plate cylinder 11 in the axial direction is provided in the vicinity of the plate cylinder 11. The plate cylinder moving means 15 is a forward / reverse rotation having a screw formed on an ink pipe of the plate cylinder 11 and a pinion meshing with the screw as an output shaft, as in the technique described in JP-A-11-208088. A porous support plate that constitutes a plate cylinder 11 that is supported by an end plate that is rotatably supported by the ink pipe by rotating the ink pipe by rotating the stepping motor 22 forward and backward. Is moved in the axial direction of the plate cylinder 11.

  A press roller 12 is disposed below the plate cylinder 11. The press roller 12 made of an elastic material having water repellency such as a fluororesin is rotatably supported at both ends by an arm member (not shown), and the arm member (not shown) is supported by a swinging means (not shown) so as to be swingable. Yes. The press roller 12 selectively occupies 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 in pressure contact with the divided plate-making master 14 on the plate cylinder 11. 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).

  In the vicinity of 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 refeed unit 9 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 sheet refeeding and conveying unit 19. The sheet receiving plate 21 is disclosed in Japanese Patent Application Laid-Open No. 2004-224479. Similar to the paper clamper 168e, a paper clamper (not shown) that clamps the leading edge of the paper is provided so as to be freely opened and closed. 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.

  On the left side of the contact position between the plate cylinder 11 and the press roller 12, the switching member 10 is disposed on the conveyance path of the paper P. The switching member 10 is rotatably supported by the apparatus main body 42 at the downstream end portion in the paper conveyance direction, and is moved by a moving means (not shown), and is indicated by a first position indicated by a solid line and a two-dot chain line in FIG. Selectively occupying the second position. 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 switching member 10 occupies the first position, and the switching 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 has a known configuration including a master holding member that holds a master roll obtained by winding a master into a roll, a platen roller, a thermal head, a master cutting unit, a master stock unit, a tension roller pair, a reverse roller pair, and the like. In the plate making unit 3, a divided plate-made master 14 is 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, 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. Is peeled off from the outer peripheral surface of the plate and discarded inside the plate removal box.

  A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 31, a paper discharge transport unit 32, a paper discharge tray 33, a peeling fan 34, and the like. The front end of the peeling claw 31 is provided so as to be close to and away from the outer peripheral surface of the plate cylinder 11 by a swinging means (not shown), and the paper P from the outer peripheral surface of the plate cylinder 11 when occupied. To peel off. The paper discharge conveyance unit 32 includes a driving roller, a driven roller, an endless belt, a suction fan, and the like, and conveys the printed paper P on the upper surface of the endless belt in the arrow direction of FIG. The paper discharge tray 33 has one end fence and a pair of side fences, and the printed paper P is stacked on the upper surface thereof. The peeling fan 34 is disposed above the peeling claw 31 and is blown toward the outer peripheral surface of the plate cylinder 11 to finish the surface printing process and is peeled off from the outer peripheral surface of the plate cylinder 11 by the switching member 10. The leading edge of the sheet P to be peeled off and the sheet P peeled off from the outer peripheral surface of the plate cylinder 11 by the peeling claw 31 after finishing the back surface printing process is raised by air blowing.

  An image reading unit 7 is disposed on the upper part of the apparatus main body. The image reading unit 7 focuses a contact glass (not shown), a pressure plate (not shown) provided so as to be able to contact with and separate from the contact glass, a reflection mirror and a fluorescent lamp (not shown) that scan and read a document image, and a scanned image, respectively. The lens includes a lens (not shown), an image sensor (not shown) that processes a focused image, and the like.

  FIG. 2 shows an operation panel of the stencil printing apparatus 1. In the figure, an operation panel 23 provided on the upper front surface of the apparatus main body 42 has a plate making start key 24, a printing start key 25, a test printing key 26, a continuous key 27, a clear / stop key 28, a numeric keypad 29, an enter on the upper surface. Key 30, program key 35, mode clear key 36, printing speed setting key 37, four-direction key 38, double-sided printing key 39, single-sided printing key 40, display device 41 consisting of 7-segment LED, display device 43 consisting of LCD, initial It has a setting key 44 and the like. The four-way key 50 has an up key 38a, a down key 38b, a left key 38c, and a right key 38d, and is pressed when adjusting the image position during image editing or when selecting a numerical value or item at various settings. Is done. The duplex printing key 39 is pressed before the stencil printing start key 24 is pressed when the stencil printing apparatus 1 performs the duplex printing operation. When the duplex printing key 39 is pressed, the LED 39a disposed in the vicinity of the key 39 is turned on. Is displayed in double-sided printing mode. Similarly to the double-sided printing key 39, the single-sided printing key 40 is pressed before pressing the plate making start key 24 when the stencil printing apparatus 1 performs a single-sided printing operation, and when the single-sided printing key 40 is pressed, it is arranged in the vicinity thereof. The LED 40a is turned on to indicate to the operator that the printer is in the single-sided printing mode. In the stencil printing apparatus 1, the LED 40a is lit in the initial state, and the single-sided printing mode is set.

  FIG. 3 is a block diagram of control means used in the stencil printing apparatus 1. In the figure, a control means 45 is a microcomputer having a CPU 46, a ROM 47, a RAM 48, etc. therein, and based on operation signals from a rotary encoder (not shown) and an operation panel 23, a printing unit 2, a plate making unit 3, a paper feeding unit 4 The operation of the plate discharge unit 5, the paper discharge unit 6, the image reading unit 7, the refeed unit 9, and the switching member 10 is controlled. The ROM 47 stores an operation program of the stencil printing apparatus 1 and various values and information are temporarily stored in the RAM 48. The CPU 46 stores the values and information stored in the RAM 48 and the operations called from the ROM 47. The operation of the stencil printing apparatus 1 is controlled based on the program.

Based on the above configuration, the operation of the stencil printing apparatus 1 when performing duplex printing by pressing the duplex printing key 39 will be described below.
When a document is set in the image reading unit 7 and the plate making start key 24 is pressed by the operator, the image reading unit 7 performs a document image reading operation and the plate discharging unit 5 operates to start from the outer peripheral surface of the plate cylinder 11. The used divided master plate 14 is peeled off. After the plate removal, the plate making unit 3 is operated to make a new divided plate-made master 14 which is wound around the plate cylinder 11.

  After the winding operation is completed and the stencil printing apparatus 1 is in a print standby state, when the printing start key 25 is pressed by the operator after setting various printing conditions, the plate cylinder 11 is rotated and fed at the set speed. One sheet P is separated and fed from the sheet section 4. The fed paper P is temporarily stopped by a pair of registration rollers, and then fed 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 press roller 12 occupies the press contact position, so that the paper P is transferred to the divided plate-making master 14 on the plate cylinder 11. The surface image is transferred to one surface of the paper P by pressure contact. The paper P, which has been printed on the front surface, is lifted from the front end portion by air blow from the peeling fan 34 and then peeled off from the outer peripheral surface of the plate cylinder 11 by the front end of the switching member 10 occupying the second position. Then, it is sent to the paper refeeding transport unit 19. At this time, the front end of the paper P is received by the paper receiving plate 21 and is locked by a paper clamper (not shown), and is placed on the auxiliary tray 8 from the rear end side as the paper receiving plate 21 moves. The paper P on the auxiliary tray 8 is transported in the direction of the arrow in FIG.

  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. Similarly to the first sheet P, the fed second sheet P is re-transferred by the switching member 10 occupying the second position after the surface image is transferred to one surface thereof by the press roller 12. 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. Then, the back image is transferred to the other surface by being pressed against the divided master-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 switching member 10 occupying the first position, and the front end portion thereof is blown by the peeling fan 34. Is lifted off from the outer peripheral surface of the plate cylinder 11 by the tip of the peeling claw 31. The peeled printed paper P is sent to the paper discharge transport unit 32, and is then transported in the direction of the arrow in FIG. Thereafter, the above operation is repeated until the set number of prints is consumed. When the set number of prints is reached, the operation of each part is stopped and the printing operation is completed.

Next, a setting operation for setting the position of the front image and the position of the back image with respect to the paper P in the above-described double-sided printing operation will be described.
When the initial setting key 44 on the operation panel 23 is pressed, the image position adjustment amount setting screen shown in FIG. The operator touches the portion of the cover device 43 corresponding to the side on which the image is to be moved, and then sets the movement amount using the four-way key 38. In the present embodiment, each time the four-way key 38 is pressed once, the movement amount is increased by 0.25 mm. For example, when it is desired to move only the surface image by 0.5 mm to the back side of the apparatus (hereinafter referred to as the upper side), the operator presses the “front surface (A)” display location on the display device 43 and then presses the left key 38c. Press the enter key 30 twice. After that, when the test printing key 26 is pressed by the operator, only one sheet P is fed from the paper feeding unit 4 toward the printing unit 2 and the test printing is performed. At the time of this trial printing, the control means 45 outputs an operation command to the stepping motor 22 before the paper P is fed from the paper supply unit 4, and the stepping motor 22 rotates to operate the plate cylinder moving means 15. The plate cylinder 11 moves upward as compared with the above-described duplex printing, and the position of the surface image transferred to the paper P is shifted 0.5 mm upward from the reference position, which is the initial position. Then, after the sheet P is guided to the auxiliary tray 8, the control means 45 outputs an operation command to the stepping motor 22 again, and returns the plate cylinder 11 to the position again. Thereafter, the front-side printed paper P is fed again from the auxiliary tray 8, and the back side image is transferred to the back side of the paper P.

  When the operator wants to move the back image further 0.5 mm toward the front side of the apparatus (hereinafter referred to as the lower side) from the above state, the operator presses the “Back (B)” display location on the display device 43 and then presses the right key. 38d is pressed twice and the enter key 30 is pressed. Thereafter, when the trial printing key 26 is pressed, the control means 45 outputs an operation command to the stepping motor 22 before the paper P is fed from the paper feeding unit 4, and the stepping motor 22 rotates to rotate the plate cylinder. The moving means 15 is operated to move the plate cylinder 11 to the upper side as compared with the above-described double-side printing, and after the paper P is guided to the auxiliary tray 8, an operation command is output to the stepping motor 22 again. Move below the reference position. As a result, the position of the front image transferred to the paper P is shifted 0.5 mm upward, and the position of the back image transferred to the paper P is shifted 0.5 mm downward. If only the back image is to be moved from the above-described state, the initial setting key 44 is pressed to initialize the display of the display device 43 (the state shown in FIG. 4), and then the “back side” of the display device 43 is displayed. (B) ”is pressed, and the movement amount may be set thereafter.

  After the positions of the front image and the back image are determined by trial printing, the double-sided printing operation is performed in the same manner as described above by setting the number of prints and pressing the print start key 25. In this double-sided printing operation, the plate cylinder moving means 15 is operated before the first sheet P is fed from the paper supply unit 4, and the plate cylinder 11 is moved upward. Thereafter, the first sheet P to which the front image is transferred is guided to the auxiliary tray 8, the second sheet P is fed from the paper feeding unit 4, and the second sheet P is guided to the auxiliary tray 8. Then, before the first sheet P is fed again from the auxiliary tray 8, the plate cylinder moving means 15 is operated, and the plate cylinder 11 is moved downward. Then, after the first sheet P is discharged to the sheet discharge unit 6, the plate cylinder moving unit 15 is operated again, and the plate cylinder 11 is moved before the third sheet P is fed from the sheet supply unit 4. Moved up. Thereafter, the double-sided printing operation is performed by repeating this operation.

  According to the above-described configuration, the positions of the front image and the back image formed on the paper P can be arbitrarily set in the direction orthogonal to the paper conveyance direction, so that the master is remade and the workability is deteriorated. The front image and the back image can be arranged at desired positions on the paper without causing them to move.

  As a modification of the above embodiment, during duplex printing, the second sheet P is fed from the sheet feeding unit 4 and the second sheet P is guided to the auxiliary tray 8 and then one sheet from the auxiliary tray 8. When the second sheet P is fed again, and when the third sheet P is fed from the sheet feeding unit 4 after the first sheet P is discharged to the sheet discharge unit 6, that is, the front surface printing process. The plate cylinder 11 may be idled between the back surface printing process and between the back surface printing process and the front surface printing process. With this configuration, the movement time of the plate cylinder 11 in the axial direction can be increased, and the image position adjustment amount can be set large. Further, the control means 45 may be configured to display the fact on the display device 43 when the image position adjustment amount is set large and idling is necessary, and further, according to the image position adjustment amount and the printing speed. You may comprise so that idling may be performed automatically.

  In the above-described embodiment, the plate cylinder moving means 15 is configured to move the porous support plate constituting the plate cylinder 11 in the axial direction of the plate cylinder 11 in the same manner as the technique described in JP-A-11-208088. However, a configuration in which the plate cylinder 11 itself is moved in the axial direction as in the technique described in Japanese Patent Laid-Open No. 2003-276294 may be employed. Further, the technique described in Japanese Patent Application Laid-Open No. 2004-196476 may be adopted, and the positions of the front surface image and the back surface image may be adjusted in the paper transport direction.

1 is a schematic front view of a stencil printing apparatus adopting an embodiment of the present invention. It is the schematic of the operation panel used for one Embodiment of this invention. It is a block diagram of the control means used for one Embodiment of this invention. It is the schematic which shows the display of the operation panel at the time of image position setting in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 4 Paper feed part 11 Plate cylinder 14 Master-partitioned master 15 Plate cylinder moving means 22 Stepping motor 45 Control means P Paper

Claims (5)

Having a plate cylinder, after performing a front surface printing process of printing a front image on one side of the paper fed from the paper feed unit, the paper is re-fed and a back image is printed on the other side In a stencil printing machine capable of double-sided printing that performs the backside printing process,
The plate cylinder is movable in the axial direction during rotation, and the plate cylinder is moved in the axial direction before the front surface printing step and the back surface printing step in double-sided printing, respectively, so that the front image and the back surface are moved. A stencil printing apparatus, wherein each position of an image is movable in the axial direction. In the stencil printing apparatus according to claim 1,
A stencil printing apparatus, wherein the plate cylinder is moved from the reference position by a predetermined amount in the axial direction based on the positions of the front surface image and the back surface image printed on the paper. In the stencil printing apparatus according to claim 1 or 2,
The plate cylinder is idly rotated between the front surface printing step and the back surface printing step and between the back surface printing step and the front surface printing step, and the plate cylinder is moved in the axial direction during the idling rotation. A stencil printing apparatus characterized by the above. Double-sided printing that performs a front-side printing process for printing a front-side image on one side of the paper fed from the paper feed unit, and then performing a back-side printing process for re-feeding the paper and printing a back-side image on the other side In a stencil printing apparatus having a plate cylinder on which a master on which a plate-making image corresponding to the front surface image and the back surface image is formed can be printed,
A plate cylinder moving means for moving the plate cylinder in its axial direction during rotation; and a control means for controlling the operation of the plate cylinder moving means. Before the back side printing step, the plate cylinder moving means is operated to move the plate cylinder in the axial direction, and the positions of the front surface image and the back surface image can be adjusted in the axial direction, respectively. Stencil printing device. In the stencil printing apparatus according to claim 4,
The stencil printing apparatus, wherein the plate cylinder moving means includes a stepping motor.

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