JP2006159854A - Printing method and stencil printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printing method capable of carrying and printing without adding unnecessary frictional resistance to a long paper, and to provide a stencil printer. <P>SOLUTION: A control means 57 for controlling operation of a pair of resist rollers 29 is provided not to add a carrying resistance for resisting the carrying force by a paper carrying component 43 to a long paper P when pinching between the plate cylinder 9 and a pressing means 10 to the long paper P is released in the stencil printer 1 which is equipped with the plate cylinder 9, a paper feed part 4 having the pair of resist rollers 29 for feeding the paper to the plate cylinder 9 by a specific timing, the pressing means 10 for pressing the paper to the plate cylinder 9, and a paper carrying part 43 for carrying the printed paper, and can print the long paper P longer than a peripheral length of the plate cylinder 9 in its carrying direction length as the paper. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a printing method using a stencil printing apparatus that performs thermal perforation plate-making with a thermal head on a master, and more specifically, a printing method for printing on a long sheet whose length in the conveyance direction is longer than the outer peripheral length of the plate cylinder. And a stencil printing apparatus.

  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. By transporting with a transport means, a perforated image based on the image information is subjected to hot melt perforation plate making on the master thermoplastic resin film, and then the perforated master plate is wound around a porous cylindrical plate cylinder and pressed. By pressing the paper against the outer peripheral surface of the plate cylinder by means, the ink oozed from the opening portion of the plate cylinder and the perforation portion of the master is transferred to the paper to obtain a printed image.

  In the stencil printing apparatus for performing stencil printing, the size of the master that can be wound is determined according to the area of the plate cylinder opening, and printing on a sheet having a size corresponding to the size of the master is possible. In a general stencil printing apparatus, the plate cylinder opening is configured to have an area capable of printing on A3 size paper at the maximum. When printing on paper of A3 size or less, the area of the platemaking image Are formed small, and paper is fed so as to overlap the plate-making image for printing.

  However, when printing is performed on a long sheet having a length of A3 size or more, even if printing is performed with the platemaking image area adjusted to correspond to the plate cylinder opening area, the trailing edge of the sheet Therefore, there is a problem that the sheet cannot be fed in one rotation of the plate cylinder and the trailing edge of the sheet is applied to the plate-making image of the second rotation, resulting in a printing failure. Accordingly, control is performed so that paper is fed at a rate of once per a plurality of rotations of the plate cylinder, and the sheet is pressed against the outer peripheral surface of the plate cylinder by the pressing means only in any one of the plurality of rotations of the plate cylinder. For example, “Patent Document 1” discloses a technique in which control is performed so that the operation is performed and printing is performed on a specific area of a long sheet whose conveyance direction length is longer than the outer peripheral length of the plate cylinder. .

JP 2003-341212 A

  In the above-described technique, it is possible to perform printing at a desired position on a long sheet by a stencil printing apparatus that is cheaper and smaller than other printing apparatuses, and can greatly reduce printing costs. In addition, space saving can be realized. In this technique, the long sheet fed from the sheet feeding tray is temporarily stopped when the leading edge of the sheet comes into contact with the registration roller pair, and the registration roller pair is rotationally driven at a predetermined timing to thereby press the plate cylinder and the pressing means. Then, the plate cylinder and the press roller are pressed against each other to transfer an image, and then conveyed by a belt-type conveying means and discharged onto a paper discharge tray.

  During the series of operations described above, the long sheet is rotated by the rotational force of the paper feed roller from the paper feed tray to the registration roller pair, and the registration roller pair is rotated from the registration roller pair to the pressure contact portion between the plate cylinder and the press roller. Due to the force, the plate cylinder and the press roller are conveyed from the pressure contact portion to the belt type conveying means by the rotational force of the plate cylinder, and from the belt type conveying means to the paper discharge tray by the conveying force of the belt type conveying means.

  Of these, the rear end of the long sheet may be sandwiched between a pair of registration rollers during conveyance from the belt-type conveyance unit to the paper discharge tray. In this case, the conveyance force of the belt-type conveyance unit, that is, the belt The frictional resistance force between the paper placed on the belt and the belt cannot exceed the rotational resistance force when the registration roller pair rotates together, and long paper is not conveyed and paper conveyance jam occurs. There is a risk that a problem will occur.

  An object of the present invention is to solve the above-described problems and to provide a stencil printing method and a stencil printing apparatus capable of carrying and printing without adding unnecessary frictional resistance to a long sheet.

  According to the first aspect of the present invention, a plate cylinder around which the master is wound, a paper feed unit having a pair of registration rollers that feed paper toward the plate cylinder at a predetermined timing, and the paper feed unit In addition, a stencil printing apparatus comprising a pressing means for pressing the paper against the plate cylinder and a paper transport member for transporting the printed paper, the length of the transport direction of the paper as the outer peripheral length of the plate cylinder is used. In the printing method for printing on a longer long paper, when the clamping between the plate cylinder and the pressing unit with respect to the long paper is released, a transport force by the paper transport member with respect to the long paper The operation of the registration roller pair is controlled so that no conveyance resistance against the above is added.

  According to a second aspect of the present invention, there is provided a plate cylinder around which the master is wound, a paper feed unit having a registration roller pair that feeds paper toward the plate cylinder at a predetermined timing, and the paper feed unit. A pressing means for pressing the paper against the plate cylinder and a paper transport member for transporting the printed paper, and the length of the paper in the transport direction is longer than the outer peripheral length of the plate cylinder. In the stencil printing apparatus capable of printing on a sheet, when the clamping between the plate cylinder and the pressing unit with respect to the long sheet is released, a conveying force by the sheet conveying member with respect to the long sheet And a control means for controlling the operation of the pair of registration rollers so as not to add a conveyance resistance against the above.

  According to a third aspect of the present invention, in the stencil printing apparatus according to the second aspect of the present invention, the registration roller pair further includes a driving roller and a driven roller that can contact and separate from each other, and the driving roller and the driven roller are contacted and separated. And a resist roller contact / separation unit for controlling the driving roller and the driven roller by the registration roller contact / separation unit when the clamping of the plate cylinder and the pressing unit to the long sheet is released. It is characterized by separating the roller.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to the second aspect, the registration roller pair further includes a driving roller and a driven roller pressed against the driving roller, and the driving roller is rotated at a variable speed. A roller driving unit, and when the nipping between the plate cylinder and the pressing unit with respect to the long sheet is released, the control unit causes the registration roller driving unit to move the driving roller to a sheet conveying speed of the sheet conveying member. It is characterized by being driven to rotate at a rotational peripheral speed according to the above.

  According to a fifth aspect of the present invention, the stencil printing apparatus according to any one of the second to fourth aspects further comprises a plate cylinder position detecting means for detecting the position of the plate cylinder, the plate cylinder position detecting means. The control means recognizes a position where the holding of the long paper by the plate cylinder and the pressing means is released based on the detection result from

  According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the second to fifth aspects, the paper feeding unit further sandwiches and feeds the long paper so as to be separated from each other. Separating / feeding means having a member is provided, and when the clamping between the plate cylinder and the pressing means for the long sheet is released, the control means separates the separating members from each other.

  According to the present invention, after the rotational conveyance force of the plate cylinder with respect to the long paper held and conveyed by the plate cylinder and the pressing means is released, the conveyance resistance by the registration roller pair does not act on the long paper. As a result, long paper is transported to the downstream side only by the transport force of the paper transport member, or by the transport force of the paper transport member and the transport force of the registration roller pair, preventing the occurrence of paper transport jams. This makes it possible to continuously perform a good printing operation.

  FIG. 1 shows a stencil printing apparatus that employs a first embodiment of the present invention. 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, and the like.

The printing unit 2 disposed almost at the center of the apparatus main body 8 includes a plate cylinder 9 and a press roller 10 as pressing means.
The plate cylinder 9 is rotatably supported by a support shaft 11 that also serves as an ink supply pipe. The plate cylinder 9 is rotatably driven by a plate cylinder driving means (not shown) and is detachable from the apparatus main body 8. An ink supply means 14 having an ink roller 12, a doctor roller 13, etc. is disposed inside the plate cylinder 9, and a clamper 15 that holds the tip of the master is attached to the outer peripheral surface of the plate cylinder 9 so as to be freely opened and closed. It has been. On the outer peripheral surface of the plate cylinder 9, an encoder 16 (see FIG. 4) is provided as plate cylinder position detecting means for detecting how many times the plate cylinder 9 is rotated from a predetermined home position.

  Below the plate cylinder 9 is disposed a press roller 10 having its both ends rotatably supported by a pair of arm members 17. The press roller 10 is moved away from the outer peripheral surface of the plate cylinder 9 shown by a solid line in FIG. 1 and the outer periphery of the plate cylinder 9 shown by a broken line as each arm member 17 is oscillated by an oscillating means (not shown). It selectively occupies a press-contact position that presses the surface with a predetermined press-contact force.

A plate making unit 3 is disposed in the upper right part of the apparatus main body 8. The plate making unit 3 includes a master holding member 18, a platen roller 19, a thermal head 20, a master cutting means 21, a master transport roller pair 22 and 23, and the like.
The master holding member 18 is attached to a side plate (not shown) of the apparatus main body 8, and a core of a master roll 24a formed by winding a master 24 formed by laminating a thermoplastic resin film and a porous support in a roll shape. The part is supported rotatably and detachably.

  A platen roller 19 disposed on the left side of the master holding member 18 is rotatably supported on a side plate (not shown) of the apparatus body 8 and is driven to rotate by a stepping motor 25. A thermal head 20 having a large number of heat generating elements positioned below the platen roller 19 is attached to a side plate (not shown) of the apparatus body 8, and the surface of the heat generating element is arranged around the platen roller 19 by a biasing force of a biasing means (not shown). It is pressed against the surface. The thermal head 20 selectively heats each heating element while contacting the surface of the thermoplastic resin film of the master 24, and performs hot melt perforation plate-making on the master 24.

  Master cutting means 21 is disposed on the left side of the platen roller 19 and the thermal head 20. The master cutting means 21 having a fixed blade fixed to a frame (not shown) of the apparatus main body 8 and a movable blade supported so as to be movable with respect to the fixed blade is configured such that the movable blade rotates or moves up and down with respect to the fixed blade. This is a well-known configuration for cutting the master 24 by moving.

  On the left side of the master cutting means 21, a pair of master conveying rollers 22, 23 is disposed. Each of the master conveying roller pairs 22 and 23 has a driving roller and a driven roller that are rotatably supported by a side plate (not shown) of the apparatus main body 8, and each driving roller is a platen roller 19 by driving means (not shown). The driven rollers are rotationally driven in the same direction in synchronism with each other, and the driven rollers are pressed against the corresponding driving rollers by urging means (not shown).

A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a paper feed tray 26, a paper feed roller 27, a separation roller pair 28, a registration roller pair 29, and the like.
A paper feed tray 26 on which a large number of sheets P can be stacked on the upper surface is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). The paper feed tray 26 is configured to be able to place a long paper P having a width direction length equal to or shorter than the short side length of A3 and a transport direction length longer than the outer peripheral length of the plate cylinder 9, A pair of side fences 30 that are movable in the paper width direction are disposed on the upper surface.

  Above the left end of the paper feed tray 26, a paper feed roller 27 having a high friction resistance member on the surface is disposed. The paper feed roller 27 is rotatably supported by a bracket (not shown) that is swingably supported by the apparatus main body 8. When the paper feed tray 26 is raised by a lifting means (not shown), the paper feed roller 27 is supplied with a predetermined pressure contact force. The uppermost long sheet P on the paper tray 26 is pressed against. The paper feed roller 27 is rotationally driven by a paper feed motor 31 comprising a stepping motor.

  On the left side of the paper feed roller 27, a separation roller pair 28 as a separation feeding unit is disposed. The pair of separation rollers 28 has an upper roller 28a and a lower roller 28b as separation members each having a high friction resistance member on the surface, and the upper roller 28a and the upper roller 28a are rotated by the sheet feeding motor 31 when the sheet feeding roller 27 is rotated. Synchronously driven to rotate in the same direction. The lower roller 28b is pressed against the upper roller 28a with a predetermined pressing force by a biasing force of a biasing means (not shown), and is configured to be rotatable only in the same direction as the upper roller 28a.

  A registration roller pair 29 having a driving roller 29a and a driven roller 29b is disposed on the left side of the separation roller pair 28. The drive roller 29a is rotatably supported between side plates (not shown) of the apparatus main body 8, and is rotationally driven by a variable speed stepping motor 37 shown in FIG. The operation of the stepping motor 37 is controlled by the control means 57 described later. A one-way clutch (not shown) is interposed in the driving roller 29a so that the rotational force from the stepping motor 37 is transmitted to the driving roller 29a, but the rotational force from the driving roller 29a is not transmitted to the stepping motor 37. It is configured.

  As shown in FIGS. 2 and 3, the driven roller 29 b is rotatably supported at the other end of a support arm 33 supported at one end by a support shaft 32 so as to be swingable. One end of the arm 34 is fixed. The other end of a tension spring 35 having one end fixed to the apparatus main body 8 is attached to the middle of the operating arm 34, and the operating arm 34 is rotated about the support shaft 32 in the clockwise direction in FIG. A biasing force is added. A long hole 34a is formed near the other end of the operating arm 34, and a plunger 36a of a solenoid 36 as a resist roller contact / separation means provided in the apparatus main body 8 is engaged with the long hole 34a.

  With the above-described configuration, the registration roller pair 29 has the driving roller 29 a and the driven roller 29 b that are moved in the clockwise direction by the urging force of the tension spring 35 when the solenoid 36 is not operated. 2 occupies the pressure contact position shown in FIG. 2, and when the solenoid 36 is operated, the operating arm 34 and the support arm 33 swing counterclockwise against the biasing force of the tension spring 35, thereby being driven by the drive roller 29 a. It occupies the separation position shown in FIG. 3 where the roller 29b is separated. The operation of the solenoid 36 is controlled by the control means 57 described later.

At the upper left of the printing unit 2, a plate discharging unit 5 is disposed. The plate removal unit 5 includes an upper plate removal member 38, a lower plate removal member 39, a plate removal box 40, a compression plate 41, and the like.
Both the upper plate removal member 38 and the lower plate removal member 39 have a driving roller, a driven roller, an endless belt, and the like, and the endless belt moves when the driving roller is rotationally driven by a plate driving means (not shown). Further, the lower plate discharging member 39 is configured to be movable by a moving means (not shown), and selectively occupies the position shown in the figure and the position where the endless belt contacts the outer peripheral surface of the plate cylinder 9.

  The plate removal box 40 for storing the used master inside is configured to be detachable from the apparatus main body 8. A compression plate 41 for pushing the used master carried by the upper plate discharging member 38 and the lower plate discharging member 39 into the plate discharging box 40 is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). The

A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 42, a paper transport member 43, a paper discharge tray 44, and the like.
The peeling claw 42 is supported by the apparatus main body 8 so that the base end of the peeling claw 42 can swing freely, and the free end formed in an acute angle by a claw swinging means (not shown) is close to the outer peripheral surface of the plate cylinder 9. The proximity position shown and the separation position separated from the outer peripheral surface of the plate cylinder 9 to avoid obstacles such as the clamper 15 are selectively occupied.

  The sheet conveying member 43 disposed on the lower left side of the peeling claw 42 includes a driving roller 45, a driven roller 46, an endless belt 47, a suction fan 48, and the like. The driving roller 45 is rotatably supported by a unit main body (not shown) and is driven to rotate by a paper discharge driving means (not shown). The driven roller 46 is also rotatably supported by a unit main body (not shown), and an endless belt 47 having a plurality of openings is stretched between the rollers 45 and 46. A suction fan 48 having a negative pressure in the interior of the unit main body (not shown) that is in the form of a casing is disposed in a lower portion of the unit main body (not shown) and located between the rollers 45 and 46. The paper transport member 43 sucks the paper P onto the endless belt 47 by the suction force of the suction fan 48 and transports the paper P downstream in the transport direction by the rotation of the driving roller 45.

  A paper discharge tray 44 on which the long paper P transported by the paper transport member 43 is stacked is disposed on the top surface of the paper discharge tray 44. The end tray 49 is movable in the paper transport direction on the paper stacking surface. It has a pair of movable side fences 50.

  An image reading unit 7 is disposed on the upper part of the apparatus main body 8. The image reading unit 7 includes a contact glass 51 on which a document is stacked, a pressure plate 52 provided so as to be able to come in contact with and away from the contact glass 51, a scanning unit 53 that scans and reads a document image, and a lens that focuses the scanned document image 54, an image sensor 55 such as a CCD for processing the focused image, and the like. Above the pressure plate 52, an ADF unit 56 used for automatically reading a plurality of documents is disposed.

  FIG. 4 shows a block diagram of the control means used in the stencil printing apparatus 1. In the figure, the control means 57 is a well-known microcomputer having a CPU, a ROM, a RAM, etc. (not shown), and is provided inside the apparatus main body 8. The control means 57 is based on the operation command from the operation panel 58 provided on the upper front surface of the apparatus body 8, the signal from the encoder 16, and the signals from various sensors of the stencil printing apparatus 1, the printing unit 2, the plate making unit 3, Controls the operations of the paper feed unit 4, the plate discharge unit 5, the paper discharge unit 6, and the image reading unit 7.

  Based on the above-described configuration, the operation of the stencil printing apparatus 1 in the first embodiment will be described below. Similar to the stencil printing apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-341212, the stencil printing apparatus 1 has a width direction length equal to or shorter than the A3 short direction length and a conveyance direction length of the plate cylinder 9. Printing on a long paper P longer than the outer peripheral length of the paper, and an operation program for printing the long paper P is stored in the control means 57. Similar to the stencil printing apparatus, the stencil printing apparatus 1 is configured to be able to print an image having an area equal to or smaller than the opening area of the plate cylinder 9 from an arbitrary position away from the leading end of the long sheet P by a printing method. The image formation position is set by the various setting keys on the operation panel 58 before the printing operation. The stencil printing apparatus 1 performs a sheet feeding operation from the sheet feeding unit 4 at a rate of once per a plurality of rotations of the plate cylinder 9 during printing of the long paper P, and any of the plurality of rotations of the plate cylinder 9 is performed. The operation is controlled by the control means 57 so that the pressing operation of pressing the long paper P against the plate cylinder 9 by the press roller 10 is performed only when it corresponds to one time.

  When the operator presses the plate making start key after placing the document to be printed on the contact glass 51 or the ADF unit 56, the image reading unit 7 is operated to read the document image, and the plate discharging unit 5 is operated. And the master of the previous plate is peeled off from the plate cylinder 9. When the plate discharging operation is completed, the plate making unit 3 is operated, and the plate making operation to the master 24 is performed. The master 24 thus made is transported by the platen roller 19 and each of the master transport roller pairs 22 and 23, and the leading end thereof is held by the clamper 15. Thereafter, when the plate cylinder 9 rotates and the winding operation of the master 24 is performed, and the control unit 57 recognizes that the master 24 for one plate has been transported by plate making, the master cutting unit 21 Operates and the master 24 is disconnected. The cut master 24 is pulled out from the inside of the plate making unit 3 by the rotation of the plate cylinder 9, the winding operation is completed, and the stencil printing apparatus 1 enters a printing standby state.

  After the stencil printing apparatus 1 is in a print standby state, when the print start key is pressed after the print image formation position, print speed, number of prints, etc. are set by various setting keys on the operation panel 58, the plate cylinder 9 is rotated at a peripheral speed corresponding to the set printing speed, and when the control means 57 determines that the plate cylinder 9 has reached a predetermined position based on a signal from the encoder 16, the paper feed motor 31 is The paper feed roller 27 and the upper roller 28 a are driven to rotate, and the long paper P is fed from the paper feed tray 26. The fed long paper P is separated into one sheet by the separation roller pair 28 and then fed toward the registration roller pair 29. At this time, the solenoid 36 is not energized, and the registration roller pair 29 occupies the press contact position. The long paper P is further fed even after the leading edge of the long paper P comes into contact with the nip portion of the registration roller pair 29, and a bend is formed between the separation roller pair 28 and the registration roller pair 29. When the control unit 57 determines that a predetermined amount of bending has been formed on the long paper P based on the number of steps of the paper feed motor 31, the operation of the paper feed motor 31 is stopped.

  Thereafter, the control means 57 recognizes that the plate cylinder 9 has been rotated to a position where the image of the master 24 wound on the plate cylinder 9 is printed at a predetermined position on the long paper P based on a signal from the encoder 16. Then, the stepping motor 37 is actuated to drive the drive roller 29 a to rotate at the same peripheral speed as the peripheral speed of the plate cylinder 9 or a slightly lower peripheral speed, and the long paper P is fed from the registration roller pair 29 toward the printing unit 2. Sent. Then, a swinging means (not shown) is activated at a timing when the leading end of the long sheet P coincides with the leading end of the image of the master 24, and the press roller 10 occupies the press contact position. Printing is performed on the long paper P by being pressed against the upper master 24. In the present embodiment, the rotational peripheral speed of the stepping motor 37 is varied only in accordance with the peripheral speed of the plate cylinder 9, that is, the printing speed of the stencil printing apparatus 1.

  When the press roller 10 occupies the press contact position, the long paper P is conveyed downstream in the conveyance direction by the rotational force of the plate cylinder 9. At this time, the driving roller 29a is rotationally driven by the operation of the stepping motor 37, but the peripheral speed is equal to or lower than the peripheral speed of the plate cylinder 9, and the one-way clutch is interposed. The roller 29a is rotated without causing resistance to transport the long paper P, and the long paper P is transported well downstream.

  The long paper P to which the image has been transferred is peeled from the leading edge of the master 24 on the plate cylinder 9 by the peeling claw 42 and is sent downward. The long paper P sent downward is attracted onto the endless belt 47 by the suction force of the suction fan 48, conveyed further downstream by the rotation of the driving roller 45, and sent onto the paper discharge tray 44. At this time, the driving roller 45 is rotationally driven at a peripheral speed at which the conveying speed of the long paper P by the endless belt 47 is slightly higher than the peripheral speed of the plate cylinder 9, and the long paper P on which the printing has been performed is the plate cylinder 9. And the sheet conveying member 43 are conveyed with a slight tension applied thereto.

  Thereafter, when all the images of the master 24 are transferred to the long paper P, the operation of the swinging means (not shown) is released and the press roller 10 occupies the separated position. In a state where the press roller 10 occupies the separation position, the rotational force of the plate cylinder 9 is not applied to the long paper P, and the long paper P is transported downstream only by the transport force of the paper transport member 43. The Rukoto. At this time, if the registration roller pair 29 occupies the pressure contact position, the conveyance of the long paper P is hindered by the frictional resistance of the registration roller pair 29, and good conveyance cannot be performed. Therefore, in the present invention, the control means 57 recognizes the position of the plate cylinder 9 immediately before the press roller 10 occupies the separation position based on the signal from the encoder 16, and at this time, the solenoid 36 is energized by a command from the control means 57. And the registration roller pair 29 is positioned at the separated position. As a result, the frictional resistance applied to the long paper P is released, so that the long paper P is not subjected to a conveyance resistance that impedes its conveyance, and the long paper P has only the conveyance force of the paper conveyance member 43. Therefore, the sheet is transported to the downstream side, and the sheet transport jam is prevented.

  In the first embodiment, the registration roller pair 29 is moved to the separation position immediately before the press roller 10 occupies the separation position. However, the long paper P is fed toward the printing unit 2 by the registration roller pair 29. After that, the registration roller pair 29 may be moved to the separated position immediately after the leading edge of the long sheet P is sandwiched between the plate cylinder 9 and the press roller 10. Further, as a modification of the first embodiment, the upper roller 28a and the lower roller 28b are configured to be contactable and separable in the same manner as the registration roller pair 29, and at the same time or just before the registration roller pair 29 moves to the separation position, The rollers 28a and 28b may be separated from each other. As a result, the transport resistance of the separation roller pair 28 added to the long paper P is also released, and the long paper P is transported more satisfactorily.

  FIG. 5 shows a stencil printing apparatus adopting the second embodiment of the present invention. The stencil printing device 59 is different from the stencil printing device 1 shown in the first embodiment in that a resist roller pair 60 is used instead of the resist roller pair 29, a sensor 62 is used, and the control means 57 is a stepping motor. The only difference is in controlling the operation of 61, and the other configurations are the same.

  The registration roller pair 60 includes a driving roller 60a and a driven roller 60b. The driving roller 60a is rotatably supported between side plates (not shown) of the apparatus main body 8, and is driven to rotate by a variable speed stepping motor 61 as a registration roller driving unit whose operation is controlled by a control unit 57. . A one-way clutch (not shown) is interposed in the driving roller 60a so that the rotational force from the stepping motor 61 is transmitted to the driving roller 60a, but the rotational force from the driving roller 60a is not transmitted to the stepping motor 61. It is configured. The driven roller 60b rotatably supported by a bracket (not shown) is always in pressure contact with the peripheral surface of the driving roller 60a by a predetermined pressure contact force by a biasing means (not shown).

  The reflective sensor 62 is disposed on the downstream side of the registration roller pair 60 in the sheet conveyance direction. The sensor 62 outputs a detection signal to the control means 57 during the detection of the long paper P, and the control means 57 detects the long paper P when the detection signal output from the sensor 62 is interrupted. It is determined that the rear end has passed the sensor 62.

  Based on the above configuration, the operation of the stencil printing apparatus 59 in the second embodiment will be described below. When the plate making start key is pressed by the operator, after the image reading operation and the plate discharging operation are performed as in the first embodiment, the plate making operation and the winding operation are performed, so that the stencil printing apparatus 59 enters the print standby state. Become. Thereafter, after various printing conditions are input by the setting key on the operation panel 58, the printing operation is performed when the printing start key is pressed.

  When the print start key is pressed, the plate cylinder 9 is driven to rotate at a peripheral speed corresponding to the set printing speed, and control is performed based on a signal from the encoder 16 that the plate cylinder 9 has reached a predetermined position. When the means 57 determines, the paper feed motor 31 is driven to rotate the paper feed roller 27 and the upper roller 28a, and the long paper P is fed from the paper feed tray 26. The fed long paper P is separated into one sheet by the separation roller pair 28 and then fed toward the registration roller pair 60. The long paper P is further fed even after the leading end thereof abuts on the nip portion of the registration roller pair 60, and a bend is formed between the separation roller pair 28 and the registration roller pair 60. When the control unit 57 determines that a predetermined amount of bending has been formed on the long paper P based on the number of steps of the paper feed motor 31, the operation of the paper feed motor 31 is stopped.

  Thereafter, the control means 57 recognizes that the plate cylinder 9 has been rotated to a position where the image of the master 24 wound on the plate cylinder 9 is printed at a predetermined position on the long paper P based on a signal from the encoder 16. Then, the stepping motor 61 is actuated to drive the drive roller 60 a to rotate at the same peripheral speed as the peripheral speed of the plate cylinder 9 or a slightly lower peripheral speed, and the long paper P is fed from the registration roller pair 60 toward the printing unit 2. Sent. Then, a swinging means (not shown) is activated at a timing when the leading end of the long sheet P coincides with the leading end of the image of the master 24, and the press roller 10 occupies the press contact position. Printing is performed on the long paper P by being pressed against the upper master 24.

  When the press roller 10 occupies the press contact position, the long paper P is conveyed downstream in the conveyance direction by the rotational force of the plate cylinder 9. At this time, the driving roller 60a is rotationally driven by the operation of the stepping motor 61. The peripheral speed is equal to or less than the peripheral speed of the plate cylinder 9, and a one-way clutch is interposed. The roller 60a is rotated without applying resistance to the transport of the long paper P, and the long paper P is transported well downstream.

  The long paper P to which the image has been transferred is peeled from the leading edge of the master 24 on the plate cylinder 9 by the peeling claw 42 and is sent downward. The long paper P sent downward is attracted onto the endless belt 47 by the suction force of the suction fan 48, conveyed further downstream by the rotation of the driving roller 45, and sent onto the paper discharge tray 44. At this time, the driving roller 45 is rotationally driven at a peripheral speed at which the conveying speed of the long paper P by the endless belt 47 is slightly higher than the peripheral speed of the plate cylinder 9, and the long paper P on which the printing has been performed is the plate cylinder 9. And the sheet conveying member 43 are conveyed with a slight tension applied thereto.

  Thereafter, when all the images of the master 24 are transferred to the long paper P, the operation of the swinging means (not shown) is released and the press roller 10 occupies the separated position. In the second embodiment, the control means 57 recognizes the position of the plate cylinder 9 immediately before the press roller 10 occupies the separation position based on the signal from the encoder 16, and at this time, the stepping motor is in response to a command from the control means 57. 61 is driven to rotate so that the peripheral speed of the driving roller 60 a is faster than the conveying speed of the long sheet P by the sheet conveying member 43. As a result, the long paper P is not transported to the downstream side by the transport force of the paper transport member 43 and the transport force of the registration roller pair 60, and the transport resistance impeding its transport is not applied to the long paper P. Occurrence of paper conveyance jam is prevented. Then, when the detection signal output from the sensor 62 to the control means 57 stops after the trailing edge of the long paper P passes through the sensor 62, a command is sent from the control means 57 and the operation of the stepping motor 61 is stopped. Is done.

  Also in the second embodiment, after the long paper P is fed toward the printing unit 2 by the registration roller pair 60, immediately after the leading edge of the long paper P is sandwiched between the plate cylinder 9 and the press roller 10. Alternatively, the registration roller pair 60 may be driven to rotate so that the peripheral speed of the drive roller 60 a is the same as the peripheral speed of the plate cylinder 9. Similarly to the modification of the first embodiment, the upper roller 28a and the lower roller 28b are configured to be contactable and separable like the registration roller pair 29, and at the same time or immediately before the registration roller pair 29 moves to the separation position. The rollers 28a and 28b may be separated from each other.

  In each of the above-described embodiments and modifications, the press roller 10 that has a smaller diameter than the plate cylinder 9 and can be freely contacted and separated from the plate cylinder 9 as the pressing means, and rotates with the plate cylinder 9 when pressed against the plate cylinder 9 is provided. Although the example used was shown, as a press means, it is not restricted to the press roller 10, It is the same diameter as the plate cylinder 9, and it can contact | separate to and separate from the plate cylinder 9, and it synchronizes with the plate cylinder 9 and turned to the reverse direction An impression cylinder that is rotationally driven at the same peripheral speed may be used. Hereinafter, an embodiment using this impression cylinder will be described as a third embodiment.

  FIG. 6 is a schematic diagram of a main part of a stencil printing apparatus adopting the third embodiment of the present invention. In the figure, the stencil printing device 63 is different from the stencil printing device 59 shown in the second embodiment in that a pressure drum 64 as a pressing means is used instead of the press roller 10 and a resist roller pair 60 is used instead. The difference is only in that the roller pair 65 is used, the sensor 66 is used, and the separation roller pair 28 is contactable and separable as in the above-described modification, and the other configurations are the same.

  An impression cylinder 64 that is formed to have the same diameter as the plate cylinder 9 and has an openable / closable gripper that holds the leading end of the long paper P on its outer peripheral surface is provided on an arm member (not shown) provided below the plate cylinder 9. Both ends thereof are rotatably supported, and a rotational driving force from a plate cylinder driving unit (not shown) is transmitted by a driving force transmission unit (not shown), so that it is rotated in the reverse direction in synchronization with the plate cylinder 9. . An arm member (not shown) that supports the impression cylinder 64 is supported by the apparatus main body 8 so as to be swingable. The arm member (not shown) is swung by a swinging means (not shown), so that the pressure drum 64 has an outer peripheral surface thereof. The plate cylinder 9 is configured so as to be able to contact and separate from the outer peripheral surface.

  The registration roller pair 65 includes a driving roller 65a and a driven roller 65b. The drive roller 65a is rotatably supported between side plates (not shown) of the apparatus main body 8 and is driven to rotate by a variable speed stepping motor 67 (shown only in FIG. 6) whose operation is controlled by the control means 57. . A one-way clutch (not shown) is interposed in the driving roller 65a so that the rotational force from the stepping motor 67 is transmitted to the driving roller 65a, but the rotational force from the driving roller 65a is not transmitted to the stepping motor 67. It is configured.

The driven roller 65b is rotatably attached to the other end of a bracket (not shown) whose one end is swingably supported by the apparatus main body 8. The peripheral surface of the driven roller 65b is driven by a biasing force of a biasing means (not shown). The peripheral surface is pressed with a predetermined pressing force. A cam follower that engages with a circumferential surface of a cam provided on the plate cylinder 9 is rotatably attached to a bracket (not shown), and the driven roller 65b is synchronized with the drive roller 65a in synchronization with the rotation of the plate cylinder 9. It is connected and separated.
The reflective sensor 66 is disposed upstream of the registration roller pair 65 in the sheet conveyance direction, and outputs a detection signal to the control unit 57 when the leading edge of the long sheet P is detected.

  Based on the above configuration, the operation of the stencil printing apparatus 63 in the third embodiment will be described below with reference to FIGS. FIGS. 13 to 15 each show one flow chart connected by the terminal A and the terminal B, and FIG. 16 shows a timing chart of the operation in each operation unit.

  When the plate making start key is pressed by the operator, after the image reading operation and the plate discharging operation are performed as in the first and second embodiments, the plate making operation and the winding operation are performed, and the stencil printing apparatus 63 performs printing. It will be in a standby state. Thereafter, after various printing conditions are input by the setting key on the operation panel 58, the printing operation is performed when the printing start key is pressed.

  When the print start key is pressed (ST1), the plate cylinder 9 is driven to rotate at a peripheral speed corresponding to the set printing speed, and the impression cylinder 64 is also driven to rotate synchronously. Then, when the control means 57 determines that the plate cylinder 9 has reached a predetermined position based on the signal from the encoder 16 (ST2), the rear end of the long paper P that has been fed forward moves the registration roller pair 65. The operation is stopped for a predetermined time until it comes off (ST3), and then the paper feed motor 31 is driven, and the paper feed roller 27 and the upper roller 28a are rotationally driven to feed the long paper P from the paper feed tray 26. (ST4). The fed long paper P is separated into one sheet by the separation roller pair 28 and then fed toward the registration roller pair 65. Then, it is determined whether or not the trailing edge of the long sheet P has been detected by the sensor 66 after the paper feed motor 31 has been rotated for a predetermined time (ST5). After the predetermined time has elapsed, that is, the paper feed motor 31 is in a predetermined step. If the detection signal from the sensor 66 is not sent to the control means 57 even after several rotations (ST6), the control means 57 determines that a paper feed non-feed has occurred and stops the operation (ST7).

  When the detection signal from the sensor 66 is sent to the control means 57 within a predetermined time, the control means 57 continues the rotation of the paper feed motor 31. The long paper P is further fed even after its leading edge abuts against the nip portion of the registration roller pair 65, and a bend is formed between the separation roller pair 28 and the registration roller pair 65 (ST8). If the control means 57 determines that a predetermined amount of bending has been formed on the long paper P based on the number of steps of the paper feed motor 31, the operation of the paper feed motor 31 is stopped (ST9), and the stencil printing device 63 is shown in FIG. It becomes a state.

  Thereafter, the control means 57 recognizes that the plate cylinder 9 has been rotated to a position where the image of the master 24 wound on the plate cylinder 9 is printed at a predetermined position on the long paper P based on a signal from the encoder 16. Then (ST10), after a predetermined time set for each printing speed (ST11), the stepping motor 67 is operated and the drive roller 65a is rotationally driven at a predetermined peripheral speed higher than the peripheral speed of the plate cylinder 9 ( At the same time as ST12), the paper feed motor 31 is driven to rotate (ST13). When the control means 57 determines that the paper feed motor 31 has rotated a predetermined number of steps (ST14), the operation of the paper feed motor 31 is stopped (ST15). By this series of operations, the bending of the long paper P formed between the separation roller pair 28 and the registration roller pair 65 is gently erased without generating a loud sound.

  Next, it is determined by the control means 57 whether or not the leading edge of the long sheet P has been detected by the sensor 62 (ST16). If the detection signal from the sensor 62 is not input within a predetermined time (ST17), the control is performed. The means 57 determines that a paper transport jam has occurred and stops its operation (ST18).

  When the leading edge of the long paper P is detected by the sensor 62, feedback control is performed (ST19), and the long paper P is further fed into the state shown in FIG. The control means 57 determines from the signal from the encoder 16 and the number of steps of the stepping motor 67 whether or not the leading edge of the long paper P has caught up with the holding claw of the impression cylinder 64 (ST20). When it is determined that the catching claw of the impression cylinder 64 has caught up, a command is sent from the control means 57, and the rotational peripheral speed of the stepping motor 67 is changed to a peripheral speed slightly higher than the rotational peripheral speed of the plate cylinder 9 (ST21). .

  Thereafter, the swinging means (not shown) is activated at the timing when the leading edge of the long sheet P is aligned with the leading edge of the image of the master 24, and the long sheet P held on the peripheral surface of the impression cylinder 64 is moved to the plate cylinder. 9 is pressed against the master 24 on the top 9 and printing is performed. When the control unit 57 determines that the plate cylinder 9 has reached a predetermined position where the registration roller pair 65 is separated (ST22), the operation of the stepping motor 67 is stopped (ST23) and the separation roller pair 28 is separated. (ST24) The stencil printing device 63 is in the state shown in FIG.

  When the control unit 57 determines that the plate cylinder 9 further rotates and the plate cylinder 9 has reached the same predetermined position as ST2 in the second rotation based on the signal from the encoder 16 (ST25), after a predetermined time has passed (ST26). ), The stepping motor 67 is rotationally driven at the same peripheral speed as the peripheral speed of the impression cylinder 64, and the registration roller pair 65 is pressed again (ST27), so that the stencil printing apparatus 63 is in the state shown in FIG.

  Next, when the control unit 57 determines that a predetermined image is transferred onto the long sheet P and the plate cylinder 9 and the impression cylinder 64 are separated from each other based on a signal from the encoder 16 (ST28), the control unit 57 performs stepping. A command is sent to the motor 67, and the rotational peripheral speed is changed so as to be slightly higher than the paper transport speed by the paper transport member 43 (ST29). As a result, the long sheet P is not subjected to a conveyance resistance that hinders the conveyance of the long sheet P, and the long sheet P is favorably downstream due to the conveying force of the sheet conveying member 43 and the conveying force of the registration roller pair 65 as shown in FIG. The paper is jammed to prevent the paper from being jammed.

  When the trailing edge of the long sheet P passes through the sensor 62 and the detection signal output from the sensor 62 to the control means 57 is interrupted (ST30), a command is sent from the control means 57 to the stepping motor 67. When the operation is stopped (ST31), the pair of separation rollers 28 comes into pressure contact again (ST32), and the stencil printing device 63 is in the state shown in FIG. After that, when the long paper P printed by the paper transport member 43 is discharged to the paper discharge tray 44, all operations are stopped after the plate cylinder 9 is returned to the predetermined home position, and the stencil printing device 63. Is again in a print standby state.

  As described above, in each of the above-described embodiments and modifications, after the rotational conveyance force of the plate cylinder to the long paper nipped and conveyed by the plate cylinder and the pressing unit is released, the conveyance resistance by the registration roller pair is long. Since a configuration that does not act on the scale paper is adopted, the long paper is transported to the downstream side favorably only by the transport force by the paper transport member, or by the transport force by the paper transport member and the transport force by the pair of registration rollers. Further, it is possible to continuously perform a good printing operation by preventing the occurrence of a paper conveyance jam.

1 is a schematic front view of a stencil printing apparatus adopting a first embodiment of the present invention. It is the schematic at the time of the pressure contact of the registration roller pair used for the 1st Embodiment of this invention. It is the schematic at the time of separation | spacing of the registration roller pair used for the 1st 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 employ | adopted the 2nd Embodiment of this invention. It is a principal part schematic front view of the stencil printing apparatus which employ | adopted the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is the schematic for demonstrating the state of the elongate paper and stencil printing apparatus in the 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the stencil printing apparatus in the 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the stencil printing apparatus in the 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the stencil printing apparatus in the 3rd Embodiment of this invention. It is a timing chart of the operation | movement in each action | operation part of the stencil printing apparatus in the 3rd Embodiment of this invention.

Explanation of symbols

1, 59, 63 Stencil printing machine 4 Paper feed section 9 Plate cylinder 10 Pressing means (press roller)
16 Plate cylinder position detection means (encoder)
24 Master 28 Separation feeding means (separation roller pair)
28a Separating member (upper roller)
28b Separating member (lower roller)
29, 60, 65 Registration roller pair 29a, 60a, 65a Drive roller 29b, 60b, 65b Drive roller 36 Registration roller contact / separation means (solenoid)
43 Paper conveying member 57 Control means 61 Registration roller driving means (stepping motor)
64 Pressing means (impression cylinder)
P Long paper

Claims (6)

A plate cylinder on which a master is wound, a paper feed unit having a registration roller pair that feeds paper toward the plate cylinder at a predetermined timing, and the paper fed from the paper feed unit to the plate cylinder Using a stencil printing apparatus comprising a pressing means for pressing and a sheet conveying member for conveying a printed sheet, the sheet is printed on a long sheet whose length in the conveyance direction is longer than the outer peripheral length of the plate cylinder In the printing method to perform
When the holding between the plate cylinder and the pressing unit with respect to the long sheet is released, the registration roller pair is configured so that a conveyance resistance against the conveyance force by the sheet conveyance member is not added to the long sheet. A printing method characterized by controlling the operation of the printer. A plate cylinder on which a master is wound, a paper feed unit having a registration roller pair that feeds paper toward the plate cylinder at a predetermined timing, and the paper fed from the paper feed unit to the plate cylinder It comprises a pressing means for pressing and a sheet conveying member for conveying a printed sheet, and the sheet can be printed on a long sheet whose length in the conveying direction is longer than the outer peripheral length of the plate cylinder. In a stencil printing machine,
When the holding between the plate cylinder and the pressing unit with respect to the long sheet is released, the registration roller pair is configured so that a conveyance resistance against a conveyance force by the sheet conveyance member is not added to the long sheet. A stencil printing apparatus comprising control means for controlling the operation of the stencil. In the stencil printing apparatus according to claim 2,
The registration roller pair includes a driving roller and a driven roller that can be brought into contact with and separated from each other, and includes a registration roller pair contacting / separating unit that contacts and separates the driving roller and the driven roller, and the plate cylinder for the long sheet; The stencil printing apparatus, wherein when the clamping with the pressing unit is released, the control unit separates the driving roller and the driven roller by the registration roller contact / separation unit. In the stencil printing apparatus according to claim 2,
The registration roller pair includes a driving roller and a driven roller pressed against the driving roller, and includes a registration roller driving unit that rotationally drives the driving roller at a variable speed, and the plate cylinder and the pressing unit for the long sheet. When the nipping is released, the control means causes the registration roller driving means to rotationally drive the driving roller at a rotational peripheral speed corresponding to the paper conveying speed of the paper conveying member. In the stencil printing apparatus according to any one of claims 2 to 4,
Plate cylinder position detecting means for detecting the position of the plate cylinder is provided. Based on the detection result from the plate cylinder position detecting means, the control means holds the long sheet between the plate cylinder and the pressing means. A stencil printing apparatus for recognizing a released position. In the stencil printing apparatus according to any one of claims 2 to 5,
The paper feeding unit includes a separation feeding unit having separation members that can be separated from each other to nipping and feeding the long sheet, and the nipping between the plate cylinder and the pressing unit with respect to the long sheet is released. The stencil printing apparatus is characterized in that the control means separates the separating members from each other.

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