JP2012139945A - Stencil printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printing apparatus in which stress is not concentrated on a master in a sheet edge or the like and the damage of the master is effectively prevented.SOLUTION: Printing is performed in such a manner that an ink pipe 5 is arranged, the master 8 subjected to heat perforation plate making is wound around a porous and cylindrical plate cylinder 1 which is supported freely rotatably around the central axis line of the plate cylinder, a sheet such as an envelope 30 is continuously pressed against the plate cylinder 1 by means of a press roller 15 and ink is made to seep out through a perforation part of the master 8. A sheet-moving means which is made to move the relative position between the sheet and the master 8 attached to the plate cylinder 1 in accordance with the printed number of sheets is provided. Even if using the sheet which tends to damage the master 8, the damage of the master 8 is prevented so that the same part of the master 8 is not continuously exposed to the stress.

Description

  The present invention relates to a stencil printing apparatus, and in particular, includes an ink supply means, and a master that is heated and perforated is wound around a cylindrical plate cylinder that is rotatably supported around its central axis, and is pressed against the plate cylinder. The present invention relates to a stencil printing apparatus that performs printing by continuously pressing a sheet by means and causing ink to ooze out through a perforation portion of a master.

  A thermal digital stencil printing apparatus is well known as a stencil printing apparatus. In such a stencil printing apparatus, a rotatable plate cylinder formed by wrapping a mesh screen of a resin or metal mesh body, a Japanese paper fiber or a synthetic fiber of a thermoplastic resin film and a porous support, a Japanese paper and a synthetic fiber A stencil master having a laminate structure in which a mixture of materials is bonded is used. In this stencil printing apparatus, a master made by thermal perforation engraving is prepared by bringing a thermoplastic resin film of a stencil master into contact with a heating element of a thermal head, and this master is wound around a plate cylinder to supply ink provided inside the plate cylinder. Ink is supplied by the member, and ink is oozed out from the opening portion of the plate cylinder and the punching portion of the master while the sheet is continuously pressed against the plate cylinder by a press roller or the like, and printing is performed on the sheet.

  Here, the film thickness of the heat-sensitive master to be used is generally about 1 to 2 [mu] m, and printing is performed by exuding the ink filled in the support on the back surface of the master from the perforated part. There are many types of paper used for printing in stencil printing machines. In terms of size, paper that exceeds business card size to A3 size, and paper with large thickness and local expansion such as government-made postcards, envelopes, and drawing paper Also used.

  As mentioned above, the master film used in the stencil printing machine has a very thin film thickness of about 1 to 2 μm. When printing on paper with edges that are edge-shaped or with burrs that are poorly cut at the edges, the surface pressure when pressing thick parts due to uneven thickness It becomes locally large, or edges and burrs are continuously rubbed in contact with the film at the same place, so that a thin film is cut or a hole is opened. Then, the ink oozes out from the open part, and the problem is that the printed surface is soiled in the form of dots on the surface of the paper, or the printed matter is soiled in the form of a plane or raindrop when the opening becomes large. There is.

  In order to prevent the master from being damaged by such thick paper, Patent Document 1 discloses that at least a corner portion of the envelope is crushed by a pressing mechanism when the envelope is fed toward the printing device along the envelope conveyance path. Or, bend the corners of the envelope away from the plate cylinder to prevent the hard corners of the envelope from scratching the master on the plate cylinder when the envelope is used as a printing medium. Is described.

  Further, in Patent Document 2, based on a signal from a master paper size detection sensor group, the outer peripheral surface of the impression cylinder is a printing paper between a paper leading edge position and a printing start position along the rotation direction of the printing cylinder in the printing paper. Control means for controlling the cam drive motor of the contact / separation time varying means so as to press against the master that has made the plate on the plate cylinder, and the printing end position and the paper rear end position along the rotation direction of the plate cylinder in the printing paper. In this publication, the cam drive motor is controlled so that the outer peripheral surface of the impression cylinder is separated from the plate cylinder.

  However, even if the paper thickness is small, even when the same master prints thousands of sheets, the number of times the edge of the paper comes into contact with the film increases. The contacting film portion may be rubbed and cut in the same manner, or a hole may be opened and the printed matter may be soiled.

  However, conventionally, in order to deal with such problems, after printing to a certain extent, the master can be remade anew, or the burr side can be turned over so that it does not touch the master. There is a need for a stencil printing apparatus that can cope with such problems.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stencil printing apparatus capable of preventing damage to a master by avoiding stress concentration on the master due to contact with a paper edge or the like. .

  The invention according to claim 1, which solves the above-mentioned problem, is provided with an ink supply means, and a master that is heated and perforated is wound around a cylindrical plate cylinder that is rotatably supported around its central axis, and is pressed against the plate cylinder. In a stencil printing apparatus that performs printing by continuously pressing a sheet by means and causing ink to bleed through a perforation portion of a master, the sheet moving means for printing while moving the relative position of the sheet with respect to the plate cylinder according to the number of prints A stencil printing apparatus comprising:

  Similarly, the invention according to claim 2 is the stencil printing apparatus according to claim 1, wherein the sheet moving means moves the sheet to the downstream side in the transport direction.

  Similarly, the invention of claim 3 is the stencil printing apparatus according to claim 1, wherein the sheet moving means moves the sheet upstream in the transport direction.

  Similarly, the invention of claim 4 is the stencil printing apparatus according to claim 1, wherein the sheet moving means moves the sheet to the upstream side and the downstream side in the sheet conveying direction.

  Similarly, the invention of claim 5 is the stencil printing apparatus according to claim 1, wherein the sheet moving means moves the sheet along the axis of the plate cylinder.

  Similarly, the invention of claim 6 is the stencil printing apparatus according to claim 1, wherein the sheet moving means moves the sheet in a direction along the axial direction of the plate cylinder, upstream in the sheet conveying direction, and downstream in the sheet conveying direction. It is made to move.

  According to the present invention, it is possible to effectively prevent damage to the master without concentrating stress on the master at the edge of the sheet.

1 is a schematic diagram illustrating a schematic configuration of a stencil printing apparatus according to Embodiment 1. FIG. It is a block diagram which similarly shows the control system of a stencil printing apparatus. It is a top view which shows the envelope which is paper. FIG. 3 is a schematic diagram illustrating a printing state of the stencil printing apparatus according to the first embodiment. It is a graph which similarly shows the relationship between the number of printed sheets of a stencil printing apparatus, and a printing position. 6 is a block diagram showing a control system of a stencil printing apparatus according to Embodiment 2. FIG. Similarly, the movement of the plate cylinder and the paper of the stencil printing apparatus is shown, (a) is a schematic diagram showing the movement of the plate cylinder, and (b) is a schematic diagram showing the movement of the paper.

  The stencil printing apparatus according to the present invention winds a master having been heated and perforated around a porous cylindrical plate cylinder rotatably supported around a central axis, and continuously rolls paper such as envelopes with a press roller around the plate cylinder. The ink is oozed through the perforated part of the master and printing is performed. The stencil printing apparatus includes sheet moving means for moving the relative position of the sheet and the master 8 attached to the plate cylinder 1 in accordance with the number of printed sheets. Even if the sheet easily damages the master, the same portion of the master is provided. Prevents continuous exposure to stress, prevents damage to the master, and performs good printing.

  Hereinafter, a stencil printing apparatus according to an embodiment of the present invention (hereinafter simply referred to as an embodiment) will be described. Several examples will be described below, but the present invention is not limited to these examples, and many improvements, modifications, variations, substitutions and application examples are possible without departing from the true spirit and scope of the present invention. It will be possible for those skilled in the art to conceive.

<Example 1>
A stencil printing apparatus according to Example 1 will be described below. FIG. 1 is a schematic diagram illustrating a schematic configuration of the stencil printing apparatus according to the first embodiment, and FIG. 2 is a block diagram illustrating a control system of the stencil printing apparatus according to the first embodiment. In Example 1, as shown in FIG. 1, the stencil printing apparatus includes a plate making apparatus 21 that creates a master based on an image signal, a printing apparatus 22 that performs printing on a sheet using a master wound around the plate cylinder 1, And a plate discharging device (not shown) for discharging the master removed from the plate cylinder 1 after printing is completed.

  These units are connected to a control device 24 and driven and controlled as shown in FIG. The control device 24 is connected to an operation panel 25 to which an operation instruction from an operator is input, a paper size sensor 26 that detects a paper size and outputs a size signal, and conveys the paper to the printing device 22. A registration roller motor 40 for driving the registration roller 14 is connected and driven and controlled.

  In the stencil printing apparatus according to the first embodiment, the master 8 is wound up to form a roll 8a, and a roll core 8b of the roll 8a is rotatably supported by holder means (not shown). A platen roller 9 rotatably supported by a plate making unit side plate (not shown) and a thermal head 10 having an infinite number of heating elements are disposed on the downstream side of the master conveyance. The master 8 includes a platen roller 9 and a thermal head 10. It is pressed and conveyed. The platen roller 9 is driven to rotate clockwise by a stepping motor (not shown), so that the master 8 is fed out from the roll 8a.

  The thermal head 10 is urged against the platen roller 9 by a spring member (not shown). On the downstream side of the master transport of the platen roller 9, a cutter 11 of an upper and lower blade guillotine type or a rotary blade moving type that cuts the master 8 made to an appropriate length, and a plate making unit side plate (not shown) are rotated in a pressed state. A pair of conveying rollers 12 that are freely supported is provided. The conveying roller 12 is set to a speed slightly higher than the conveying speed of the platen roller 9 and applies a predetermined tension while sliding slightly with the master 8. An arcuate guide plate 13 is provided on the downstream side of the conveying roller 12 to guide the leading end of the master 8 made toward the clamper 7 to be described later. These constitute the plate making apparatus 21.

  On the lower left side of the plate making apparatus 21, a plate cylinder 1 configured by winding a plurality of layers of a porous support cylindrical body and a mesh screen of a resin or metal mesh (not shown) covering the outer periphery of the plate is supported as an ink pipe 5. It is fixed to a flange (not shown) that is rotatably supported by the shaft, and is driven to rotate clockwise by a driving force transmitted by a drive transmission means gear (not shown). An ink roller 2 whose shaft portion is rotatably supported by a side plate (not shown) fixed to the ink pipe 5 is synchronized with the plate cylinder 1 by a drive transmission means gear, a belt (not shown). Are rotated in the same direction.

  A doctor roller 3 is provided with a slight gap from the outer peripheral surface of the ink roller 2, and the ink in the ink reservoir 4 formed in the wedge-shaped space between the ink roller 2 and the doctor roller 3 is thinly formed on the outer surface of the ink roller 2. Supply. The ink in the ink reservoir 4 is sucked from an ink pack or the like provided outside the plate cylinder by an ink supply device (not shown) and supplied to the ink reservoir 4 from the supply hole of the ink pipe 5. On the surface of the non-opening portion of the plate cylinder 1, a stage 6 made of a magnetic material is provided along one bus bar of the plate cylinder 1. A clamper 7 is provided in parallel with the stage 6 and is opened and closed at a predetermined position by an opening / closing device (not shown). The plate cylinder 1 can be engaged and disengaged integrally with an ink pack or the like in its own axial direction.

  On the lower side of the plate cylinder 1, as a pressing means whose shaft portion is rotatably supported by an arm shaft 16a that is rotatably supported by a housing side plate (not shown) and a press roller arm 16 pair that is fixed to the arm shaft 16a. The press roller 15 is brought into contact with and separated from the plate cylinder 1 by a cam or the like (not shown), is urged toward the plate cylinder 1 by a spring member (not shown), and other than when paper is passed by a locking means (not shown). It is held at a separated position. On the right side of the press roller 15, a sheet feeding tray (not shown), a separation sheet feeding device that separates and feeds the stacked sheets one by one, and the plate cylinder 1 and the press roller are timed for the separated and fed sheets. A registration roller 14 is provided between the first and second rollers 15.

  The registration roller 14 is rotationally driven by a registration roller motor 40. The registration roller motor 40 is driven and controlled by a control device 24, and a sheet such as an envelope 30 fed by the registration roller 14 is wound around the plate cylinder 1. It is driven so as to be in a predetermined position with respect to the punched image of the master.

  On the left side of the plate cylinder 1 in the drawing, a peeling claw (not shown) that peels off the printing paper from the surface of the plate cylinder 1 in the vicinity of the plate cylinder 1 and a pivotally supported peeling claw that is not shown are stacked on the lower side. A paper discharge tray (not shown) is provided.

  Next, the operation of the stencil printing apparatus according to the first embodiment will be described. In this example, a case where the envelope 30 is used as a sheet will be described. FIG. 3 is a plan view showing an envelope which is a sheet, and FIG. 4 is a schematic diagram showing a printing state of the stencil printing apparatus according to the first embodiment. The four corner portions 30a of the envelope 30 are uneven in thickness due to the presence of other folded portions that are thicker than other portions, and the master is likely to be damaged. For this reason, in the stencil apparatus according to the first embodiment, the position of the envelope 30 relative to the master 8 disposed on the plate cylinder 1 at the time of printing is gradually moved in the sheet conveyance direction according to the number of printed sheets by the sheet moving means. Go.

  In the stencil printing apparatus according to the first embodiment, when the envelope 30 is detected by the paper size sensor 26, the control device 24 changes the entry timing of the envelope 30 with respect to the plate cylinder 1 and moves the position thereof. 40 is driven and controlled. The control device 24 is configured as a computer having a CPU, a ROM, a RAM, and the like. The CPU executes software stored in the ROM or the like using the RAM as a work area, thereby realizing a function as a sheet moving unit. To do.

  That is, the size of the paper to be passed on the paper feed tray is read by the paper size sensor 26, and the size information, the number of printed sheets from the operation panel 25, and paper quality information such as postcards and sealed letters are input. The control device 24 determines the rotation timing for the cumulative number of printed sheets of the registration rollers 14 and sets the relative movement amount of the sheet with respect to the master 8.

  When the original is set and the start button or the like of the operation panel 25 is pressed, the plate cylinder 1 opens the clamper 7 and the plate discharger 23 peels the used master from the plate cylinder 1 according to the instruction of the control device 24. Discard it.

  Next, the clamper 7 of the plate cylinder 1 rotates until it is in a substantially lateral position, and the clamper 7 is released to enter a plate feed standby state. When the plate cylinder 1 is stopped, a document is sent to a reading unit by a document reading device (not shown), and image data is acquired by a CCD line sensor or the like. This image data is passed through an A / D converter, a plate making control device, etc. A portion corresponding to the solid plate-making region 8 is punched by the energized heating element of the thermal head 10. While the master 8 is transported by the pair of the platen roller 9 and the transport roller 12 driven by the step motor, the thermal film of the master 8 is punched by the thermal head 10 and plate making is performed.

  After the master 8 is made, the front end of the master 8 is guided between the stage 6 and the clamper 7 by the guide plate 13, and it is determined that the front end of the master 8 has reached the clamper 7 from the number of steps of the stepping motor. Then, the clamper 7 is closed by the opening / closing device to clamp the leading end of the master 8, and the plate cylinder 1 resumes rotating at a speed substantially the same as the master conveying speed, and the master 8 thus made is wound around the plate cylinder 1. Is done.

  When the controller 24 determines that the plate making is completed based on the number of steps of the stepping motor, the control device 24 operates the cutter 11 to cut the master 8 and stops the platen roller 9 and the conveying roller 12 and the like. The trailing end is pulled out by the rotation of the plate cylinder 1 and the winding around the plate cylinder 1 is completed.

  When the winding of the master 8 around the plate cylinder 1 is completed, the envelope 30 is sent out by a separating paper feeding means (not shown) and is timed by the registration roller 14 as shown in FIG. It is sent out between. By detecting the approach of the envelope 30 by a sensor (not shown), the regulating means (not shown) is released, the press roller 15 is raised, and the envelope 30 is continuously pressed against the plate cylinder 1 to pass through the punching portion of the master 8. Plate printing and ink filling are performed. The envelope 30 pressed and printed by the plate cylinder 1 is peeled off from the plate cylinder 1 by a not-shown peeling claw and the like approaching and separating from the plate cylinder 1 and discharged and stacked on a paper discharge tray (not shown). The set number of prints are performed in the same operation after the printing is finished.

  As shown in FIG. 5A, the envelope 30 to be passed at this time is controlled by the control device 24 so that the relative position of the sheet with respect to the plate cylinder 1 gradually delays toward the upstream side of conveyance as shown in FIG. Printing is done. For this reason, the envelope 30 is not continuously printed at the same location on the master 8 and the master 8 is not damaged. Note that the amount of movement of the envelope 30 relative to the plate cylinder 1 is preferably the minimum amount of movement that does not cause damage to the master 8 and is such that the movement does not affect the printing result.

  In the above example, the positional movement of the paper has been described for the case where the paper is an envelope, but the same processing can be performed for a paper that easily damages the master, such as a thick paper. In this case, it is determined that the sheet is to be subjected to the position movement process from the designation from the operation panel 25, the sheet size detected by the sheet size sensor 26, and the sheet thickness detected by a known thickness sensor (not shown). be able to.

  In the above example, the paper position movement process is sent to the upstream side in accordance with the number of printed sheets. However, this can be changed as necessary. In the example shown in FIG. 5B, printing is performed while the position is controlled so as to gradually advance the paper to the downstream side of paper conveyance as printing is performed.

  Further, in the example shown in FIG. 5C, the position of the paper is alternately moved to the downstream side and the upstream side of the paper according to the number of prints, and printing is performed. Note that this movement pattern can be changed as necessary. Further, the movement of the sheet can be made every sheet, every several sheets, or a combination thereof.

  As described above, according to the stencil printing apparatus according to the first embodiment, the plate cylinder of the paper is used when printing is performed on thick paper that is easily edged, or when printing is performed using paper with uneven thickness such as an envelope. Since the printing is performed by gradually changing the relative position with respect to the master wound on the upstream side and downstream side in the transport direction, the same part of the master is not continuously rubbed, and the master is torn. Or a hole can be prevented, and even a paper that is easily damaged by the master can be printed satisfactorily.

<Example 2>
Next, a stencil printing apparatus according to Example 2 will be described. In the stencil printing apparatus according to the second embodiment, the position of the sheet is moved in the sheet conveyance direction, and the plate cylinder 1 is moved in the axial direction (direction perpendicular to the sheet surface in FIG. 1). The stencil printing apparatus according to the second embodiment has a basic structure similar to that of the stencil printing apparatus according to the first embodiment, and further includes a plate cylinder moving device that moves the plate cylinder 1 in the axial direction thereof, according to the number of printed sheets. The relative position between the sheet and the master 8 on the plate cylinder 1 after completion is changed.

  FIG. 6 is a block diagram illustrating a control system of the stencil printing apparatus according to the second embodiment. A plate cylinder moving device 27 is connected to the control device 24, and the control device 24 controls driving of the plate cylinder moving device 27. The plate cylinder moving device 27 includes a known screw feed mechanism and slide mechanism, and is controlled by the control device 24 using a motor or the like as a drive source.

  Next, the operation of the stencil printing apparatus according to the second embodiment will be described. 7A and 7B show the movement of the plate cylinder and the paper of the stencil printing apparatus according to the second embodiment. FIG. 7A is a schematic diagram showing the movement of the plate cylinder, and FIG. 7B is a schematic diagram showing the movement of the paper. In the stencil printing apparatus according to Example 2, as shown in FIG. 7A, the plate cylinder 1 gradually moves 26 along its own axial direction. Further, in the stencil printing apparatus according to the second embodiment, as shown in FIG. 7B, the envelope 30 that is a sheet can be moved upstream and downstream in the conveying direction according to the number of printed sheets. This control is performed in the same manner as in the first embodiment.

  Then, printing is performed while moving the relative position of the envelope 30 with respect to the plate cylinder 1 so that printing is not continuously performed at the same location of the master 8 by appropriately combining these operations. The pattern of the envelope 30 can be appropriately changed as necessary, and the movement of the plate cylinder 1 and the movement in the paper conveyance direction can be combined for every one sheet or several sheets.

  According to the stencil printing apparatus according to the second embodiment, when printing is performed on a thick sheet that is easily edged or when printing is performed using a sheet with uneven thickness such as an envelope, the stencil printing apparatus is wound around the plate cylinder of the sheet. Printing is performed by gradually changing the relative position of the master to the upstream and downstream sides in the transport direction, so the same part of the master will not be rubbed continuously, and the master will be torn or a hole will be opened. It is possible to prevent the ink from being damaged, and good printing can be performed even on a sheet that is easily damaged by the master.

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Ink roller 3 Doctor roller 5 Ink pipe 6 Stage 7 Clamper 8 Master 8a Roll 8b Roll core 9 Platen roller 10 Thermal head 11 Cutter 12 Conveying roller 13 Guide plate 14 Registration roller 15 Press roller 16 Press roller arm 16a Arm shaft 21 Plate making device 22 Printing device 23 Plate discharging device 24 Control device 25 Operation panel 26 Paper size sensor 27 Plate cylinder moving device 30 Envelope 30a Four corners 40 Registration roller motor

JP 2002-029130 A

Claims (6)

An ink supply means is provided, and a master that has been heated and perforated is wound around a cylindrical plate cylinder that is rotatably supported about its own central axis, and the paper is continuously pressed to the plate cylinder by a pressing means. In a stencil printing device that bleeds ink through the perforated part and performs printing,
A stencil printing apparatus comprising a sheet moving means for printing while moving a relative position of the sheet with respect to a plate cylinder in accordance with the number of printed sheets. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the sheet moving means moves the sheet to the downstream side in the conveying direction. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the sheet moving means moves the sheet to the upstream side in the transport direction. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the sheet moving means moves the sheet to the upstream side and the downstream side in the sheet conveying direction. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the sheet moving means moves the sheet along an axis of a plate cylinder. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the paper moving means moves the paper in a direction along the axial direction of the plate cylinder, upstream in the paper transport direction, and downstream in the paper transport direction.