JP6260337B2 - Stencil printing apparatus and stencil printing method - Google Patents

Description

  In the present invention, a stencil sheet made by perforation based on image data captured in an apparatus is wound around an outer peripheral surface of a porous printing drum having ink supply means inside the apparatus, and the outer peripheral surface of the printing drum is The present invention relates to a stencil printing apparatus and a stencil printing method for performing printing by pressing a recording medium with a pressing member provided so as to be freely contacted and separated.

  Conventionally, this type of stencil printing apparatus uses a stencil sheet (referred to as a master) that has been perforated and made on the basis of image data read from an original or transmitted from an externally connected device and taken into the apparatus. A recording medium (such as a press roller) is wound around an outer peripheral surface of a porous printing drum (plate cylinder) having the ink supply means and is provided so as to be able to contact with and separate from the outer peripheral surface of the printing drum. It has a basic function of printing by pressing a print sheet or the like.

  In such a stencil printing apparatus, the ink supplied to the inner peripheral surface of the printing drum oozes through the drum opening portion and the master perforation portion by pressing (printing pressure) by the pressing member, and is transferred to the printing paper to transfer the print image. However, it is known that when printing a small number of copies, it is the cost of the master that has the greatest influence on the printing cost per sheet.

  In a general stencil printing apparatus, the length of the master used for printing is constant according to the size of the printing drum, and when printing on paper that is less than the maximum printing area of the printing drum, Master is wasted. For example, when printing on A4 size paper with a printing drum having a fine aperture area that can be printed on A3 size paper, the master plate is actually made by the master even though it is the A4 size image area. Has to be used in A3 size, which causes a great waste, and at the same time, the amount of ink that is attached to the master and discarded for printing is increased, resulting in a large economic waste. is there.

  In order to deal with such a problem, a method of changing the length of the master according to the size of the paper to be used has been proposed. However, even in the case of such a technique, when the printing drum is left after the printing is finished, if the opening portion of the printing drum is exposed, there is a risk of clogging the opening portion due to surrounding dust, etc. The last plate before being left is designed to use a master of a size that can cover the aperture, that is, the master of the maximum size, and the master of the maximum size is used for the last plate. The problem remains that the reduction of economic waste cannot be satisfied.

  In short, with the conventional method of cutting a master with the minimum required length, master cut plate making corresponding to the small size is performed only at the time of plate making when a plurality of small size originals are set in the ADF, and at the time of the final manuscript Since master cut plate making corresponding to the maximum size is performed, plate making using a master with a length corresponding to a small size cannot be adopted unless ADF is used and plate making is used for multiple originals. There is a limitation that the master cannot be cut to the minimum necessary length, and the master cannot be cut to the minimum necessary length for the last one original even if there are many originals. .

  In addition, when printing is performed using a master shorter than the printable area (opening portion) of the printing drum, if printing is performed in the original pressing range, printing pressure is applied to the portion not covered by the master, and the exposed printing is performed. A mechanism that varies the printing pressure range according to the master cut length in order to prevent ink from being ejected from the opening of the drum and transferred to a press roller (pressure cylinder), which is the pressing means, to cause contamination. By preparing a printing drum with a hole area narrowed to A4 size or B4 size to save master, and recognizing the type of printing drum installed in the printing device, and replacing the printing drum A method for controlling the master length has also been proposed. However, in any case, a dedicated variable printing pressure range mechanism is required, or having various printing drums increases the size and cost of the device. It is not possible to meet the demands for realizing the above or to be provided at a low price.

  That is, in the former technique, when a short master is wound, it is necessary to control the pressing range (printing pressure range) so that the press roller does not press the opening of the printing drum where the master does not exist. In this printing pressure control, a special mechanism such as a cam for quickly removing the printing pressure is required, and the position of the cam is adjusted according to the size of the printing paper, or a plurality of cams are provided. The structure becomes complicated and inconvenience occurs, such as the need for selective control.

  Therefore, as a well-known technique proposed to solve such problems, the size of the printing paper can be obtained regardless of the conditions such as the number of documents and without requiring a special printing pressure control configuration or replacement printing drum. “Drum cover, stencil printing apparatus, stencil printing method” (see Patent Document 1) that can perform the corresponding master cut and reduce unnecessary consumption of the master.

  The technology described in Patent Document 1 described above is to cover a portion that is not covered with a short master with a drum cover in order to achieve the technical purpose, and to re-use the drum cover to suppress an increase in economic waste as much as possible. Although there is an advantage that the economic waste of the master can be reduced, since a dedicated part called a drum cover is required, it can not be said that economic waste can be reduced more than ever by adding the price of that part There is.

  The present invention has been made to solve such problems, the technical problem is that the opening portion of the plate cylinder can be covered without using the maximum size plate for the last plate before leaving the plate cylinder, An object of the present invention is to provide a stencil printing apparatus and a stencil printing method which can reduce the economic waste of the stencil sheet (master) with the same ease of use as before.

  In order to solve the above technical problem, a stencil printing apparatus according to the present invention includes a stencil plate making means for making a master which is a stencil sheet, and a cutting for cutting the master made by the first length or the second length. Means, a mounting means for transporting the cut master and mounting it on the outer periphery of the printing plate cylinder, a plate discharging means for peeling the used master from the plate cylinder during discharging, a stencil plate making means, a cutting means, a mounting means And a control means for controlling the operation process of the plate discharging means, provided between the plate cylinder and the plate discharging means and discharging the master having the first length according to the operation instruction of the control means. A plate discharging master cutting means is sometimes provided for cutting at a predetermined length so that the remaining master remains in the plate cylinder, and the mounting means has a second length with respect to the remaining master according to the operation instruction of the control means. To attach the master. And butterflies.

  In order to solve the above technical problem, the stencil printing method of the present invention includes a stencil plate making step for making a master which is a stencil sheet by a stencil plate making means, and a master made by the stencil plate by a cutting means. A cutting process step for cutting at a length or a second length, a mounting process step for transporting the cut master by the mounting means and mounting it on the outer periphery of the printing plate cylinder, and a discharging means for use at the time of discharging the plate. Stencil printing comprising: a stencil removing process step for peeling the master from the stencil cylinder; and a control means for controlling operation processing in the stencil plate making process step, the cutting process step, the mounting process step, and the stencil process step by the control means. In the method, the master of the first length is discharged between the plate cylinder and the plate discharge means according to the operation instruction in the control processing step by the plate release master cutting means. There is a plate removal master cutting process step for cutting at a fixed length and leaving the remaining master remaining in the plate cylinder. In the mounting processing step, the remaining master plate cutting process step in accordance with the operation instruction in the control processing step is performed. A master having a second length is attached to the master.

  According to the present invention, the master having the first length wound around the plate cylinder last time is discharged by the plate discharge master cutting means according to the operation instruction of the control means regardless of the conditions such as the number of documents between the plate cylinder and the plate discharge means. When this is done, the master of the second length to be wound this time corresponding to the small size of the recording medium (printing paper) covers the uncovered portion of the opening portion of the plate cylinder, and is wound around the previous plate cylinder. In order to cut the mounted first length master at a predetermined length and leave the remaining master on the plate cylinder, do not use the maximum size plate for the last plate before leaving the plate cylinder. It can be coated, and the master's economic waste can be further reduced with the same usability as before.

It is the schematic which showed the basic composition of the stencil printing apparatus which concerns on the Example of this invention from the front direction. FIG. 2 is a functional block diagram showing a detailed configuration of control system functions of the stencil printing apparatus shown in FIG. 1. It is the schematic which showed the operation | movement of the master stencil discharge by the principal part of the stencil printing apparatus shown in FIG. 1 according to the step. It is the schematic shown in order to demonstrate the length of the master wound around the printing drum of the stencil printing apparatus shown in FIG. 1, and a printing pressure range. 2A and 2B are schematic diagrams for explaining a master cutting operation by a stencil master cutting unit of the stencil printing apparatus shown in FIG. 1, wherein FIG. 3A is a diagram relating to a standby position state, and FIG. .

  Hereinafter, examples of the stencil printing apparatus and stencil printing method of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing the basic configuration of a stencil printing apparatus according to an embodiment of the present invention from the front direction. Also in this stencil printing apparatus, a master, which is a stencil sheet that has been made, is wound around the outer peripheral surface of a printing drum (plate cylinder) 101, ink is supplied from the inside of the printing drum 101, and printing paper 62 as a recording medium is also provided. Has a well-known function of printing on the printing drum 101, and the basic configuration and functions of each part are except for a plate removal master cutting unit 200 that functions as a plate removal master cutting unit, which will be described later, and a control device 210 that controls the operation thereof. The stencil printing apparatus described in Patent Document 1 is generally common.

  In other words, an original reading unit 80 having an ADF (Auto Document Feeder) function is provided on the upper part of the apparatus main body 50 of the stencil printing apparatus, and a printing having a porous printing drum 101 at the lower central part thereof. A drum unit 100 is provided. On the upper right side of the printing drum unit 100 is provided a plate making apparatus 90 that functions as a stencil plate making means for making a master 61 which is a stencil sheet. There is provided a plate removal apparatus 70 that functions as a plate removal means for peeling. Further, a sheet feeding device 110 is provided below the plate making apparatus 90, and a control device 210 for controlling operation processing in each part of the entire apparatus is provided on the bottom surface below the sheet feeding device 110. Further, a printing pressure unit 120 is provided below the printing drum unit 100, and a paper discharge device 130 is provided below the plate discharging device 70. In this embodiment, the outer peripheral length (maximum size) of the printing drum 101 corresponds to the A3 size.

  Next, an outline of the hole printing process in the stencil printing apparatus having such a configuration will be described. First, a document 60 having an image to be printed is placed on a document placing table (not shown) arranged at the top of the document reading unit 80, and a plate making start key on an operation panel device (not shown) is pressed. Along with pressing of the plate making start key, a plate removing process is first executed. That is, in this state, the used heat-sensitive stencil master (hereinafter referred to as used master) 61b used in the previous printing remains attached to the outer peripheral surface of the printing drum 101 of the printing drum unit 100. ing.

  When the printing drum 101 rotates in the direction A (clockwise direction) in FIG. 1 and the leading end portion of the used master 61b on the outer peripheral surface of the printing drum 101 approaches the plate release peeling roller pair 71a, 71b, these plate release peeling rollers. While the pair 71a, 71b is rotating, the tip of the used master 61b is scooped up by the one pair of plate release roller 71a. The used master 61b is a pair of discharge plate conveying belts 72a and 72b wound around a pair of discharge plate rollers 73a and 73b disposed on the left side of the pair of discharge plate peeling rollers 71a and 71b and the pair of discharge plate peeling rollers 71a and 71b. While being transported in the direction of the arrow Y1, it is discharged into the discharge plate box 74 and is peeled off from the outer peripheral surface of the printing drum 101 to complete the discharge plate process. At this time, the printing drum 101 continues to rotate in the clockwise direction. The used master 61 b that has been peeled and discharged is then compressed inside the plate discharging box 74 by the compression plate 75.

  In parallel with the above-described plate discharging process, the document reading unit 80 performs document reading. A document 60 placed on an ADF (not shown) is exposed and read while being transported in the directions of arrows Y2 to Y3 by the rotation of the separation roller 81, the pair of front document transport rollers 82a and 82b, and the pair of rear document transport rollers 83a and 83b. Provided. At this time, when there are a plurality of documents 60, the separation blade 84 feeds them one by one from the lowest document. In reading the image of the original 60, the reflected light from the surface of the original 60 illuminated by the fluorescent lamp 86 is reflected by the mirror 87 while being conveyed on the contact glass 85, and is constituted by a CCD (charge coupled device) through the lens 88. This is performed by being incident on the image sensor 89. The original 60 is read by a well-known reduced original reading method, and the original 60 from which the image has been read is discharged onto the original tray 80A. The electrical signal photoelectrically converted by the image sensor 89 is input to an analog / digital (A / D) conversion board (not shown) in the apparatus main body 50 and converted into a digital image signal.

  In parallel with this image reading operation, plate making and plate feeding processes are performed based on the image information converted into digital signals. A roll-shaped unprocessed thermosensitive stencil master (hereinafter simply referred to as “master”) 61 set at a predetermined portion of the plate-making apparatus 90 is pulled out of the roll state and is pressed against the thermal head 91 via the master 61. The roller 92 and the tension roller pair 93a and 93b are rotated and conveyed to the downstream side of the conveyance path. A plurality of minute heat generating portions arranged in a line on the thermal head 91 are selected according to a digital image signal sent from an A / D conversion board (not shown) with respect to the master 61 thus conveyed. Then, the thermoplastic resin film of the master 61 that is in contact with the heat generating portion that has generated heat is melt-pierced. In this way, image information is written as a drilling pattern by position-selective melt drilling of the master 61 according to the image information.

  The leading end of the pre-printed master 61a on which image information has been written is sent out toward the outer peripheral side of the printing drum 101 by a pair of plate feeding rollers 94a and 94b, and the advancing direction is changed downward by a guide member (not shown). The printing drum 101 in the plate feeding position state hangs down toward the expanded master clamper 102 (indicated by a virtual line). At this time, the used master 61b has already been removed from the printing drum 101 by the discharging process. When the leading end of the master-making master 61a is clamped by the master clamper 102 at a fixed timing, the printing drum 101 gradually winds the master-making master 61a around the outer peripheral surface while rotating in the clockwise direction. Here, the guide member and the master clamper 102 serve as mounting means for transporting the plate-making master 61a, which is a master cut in accordance with an operation instruction of the control device 210, and mounting it on the outer periphery of the printing drum 101. The rear end portion of the master-making master 61a is cut into a fixed length by a cutter 95. The cutter 95 here serves as a cutting means for cutting the master-making master 61a, which is a master made in accordance with the operation instruction of the control device 210, by the first length or the second length.

  When one plate-made master 61a is wound around the outer peripheral surface of the printing drum 101, the plate-making and plate-feeding steps are finished, and the printing step is started. First, the uppermost one of the printing papers 62 as recording media stacked on the paper feed tray 51 is sent out in the direction of the arrow Y4 by the paper feed roller 140 toward the registration roller pair 142, and further the registration rollers. The pair 142 is sent to the printing pressure portion (image transfer portion) 120 at a predetermined timing synchronized with the rotation of the drum portion 100. When the fed printing paper 62 comes between the printing drum 101 and the press roller 103, the press roller 103 that has been separated below the outer peripheral surface of the printing drum 101 is moved upward, whereby the printing drum 101. The prepress master 61a wound around the outer circumferential surface is pressed. In this way, ink oozes out from the opening portion of the printing drum 101 and the perforation pattern portion of the master-making master 61a (both are schematically shown), and the oozing ink is transferred to the surface of the printing paper 62 to form a printed image. Is done. That is, the printing drum 101 and the press roller 103 here cooperate with the operation instruction of the control device 210 to press the printing paper 62 that is a recording medium to print, and to the length of the master-making master 61a. Accordingly, it functions as a printing pressure range adjusting unit that varies and adjusts the pressing printing pressure range by the printing unit. The first printing after the plate feeding process may be referred to as printing. It should be noted that an impression cylinder may be used instead of the press roller 103 here.

  On the inner peripheral side of the printing drum 101, ink is supplied from the ink supply pipe 104 to an ink reservoir 107 formed between the ink roller 105 and the doctor roller 106, and is printed in the same direction as the rotation direction of the printing drum 101. Ink is supplied to the inner peripheral side of the printing drum 101 by an ink roller 105 that rolls in contact with the inner peripheral surface while rotating in synchronization with the rotation speed of the drum 101.

  The printing paper 62 on which the printing image is formed in the printing pressure unit 120 is peeled off from the printing drum 101 by the paper discharge peeling claw 114 and is sucked by the suction fan 118, while the suction paper discharge inlet roller 115 and the suction paper discharge outlet roller. By the rotation of the conveyor belt 117 stretched around 116 in the counterclockwise direction, the conveyor belt 117 is conveyed toward the sheet discharge device 130 as indicated by an arrow Y5 and sequentially discharged and stacked on the sheet discharge table 52. The paper discharge peeling claw 114 serves as a plate discharging means for peeling the printed printing paper 62 on which a printed image has been formed from the printing drum 101 in accordance with an operation instruction of the control device 210. In this way, so-called trial printing is completed.

  Next, when the number of prints is set with a numeric keypad (not shown) and the print start key (not shown) is pressed, the paper feeding, printing, and paper discharge processes are repeated for the set number of prints in the same process as the above trial printing. This is the end of the entire stencil printing process.

  By the way, in the stencil printing apparatus according to the embodiment, the evacuation master cutting unit 200 disposed between the printing drum 101 and the evacuation apparatus 70 sets the master master 61 a having the first length according to the operation instruction of the control device 210. The used master 61b that has been used is cut at a predetermined length at the time of discharging the plate, and the remaining master is left on the printing drum 101, and the remaining master is applied to the remaining master according to the operation instruction of the control device 210 by the mounting means described above. A feature is that it has a function of mounting the master master 61a having the second length. Incidentally, the pre-made master 61a of the second length here is cut by a cutter 95 with a length corresponding to the small size of the printing paper 62 according to the operation instruction of the control device 210, and is controlled by the mounting means. In accordance with the operation instruction 210, the printing master 101 is mounted so that the end of the master master 61a having the second length newly attached to the end of the remaining master on the printing drum 101 overlaps with a predetermined length. is there.

  FIG. 2 is a functional block diagram showing a detailed configuration of control system functions of the stencil printing apparatus. Referring to FIG. 2, this stencil printing apparatus has a master discharge master cutting unit 200 and a master plate discharging unit 201 (in FIG. 1) to a control device 210 that gives an operation instruction for controlling the operation processing of each unit in the functional configuration. 1 corresponds to the basic function of the plate discharge device 70), the image reading unit 202 (corresponding to the basic function of the document reading device 80 in FIG. 1), and the paper discharge unit 203 (the basic function of the paper discharge device 130 in FIG. 1). Corresponding), operation panel 204 (corresponding to the basic function of the operation panel device described with reference to FIG. 1), storage unit 205, printing unit 206, plate making unit 207 (basic functions of the plate making device 90 in FIG. 1). Corresponding), a paper feeding unit 208 (corresponding to the basic function of the paper feeding device 110 in FIG. 1), and a printing pressure range adjustment unit 209 are connected to each other, and the operation of each unit in cooperation with the control device 210 Processing is going to be done .

  Among these, the plate removal master cutting unit 200 has means for cutting the master to be discharged (used master 61b) on the way and control means therefor. Further, the printing pressure range adjustment 209 has means for variably changing the range in which the printing pressure is applied in accordance with each master length and control means therefor, as will be described in detail later with reference to FIG. Using the image reading unit 202, the plate making unit 207, the plate discharging unit 203, the storage unit 205, and the control device 210, the master length corresponding to the small size of the printing paper 62 and the used master 61b to be left on the printing drum 101 are stored. Calculate the master length. The operation panel 204 can select whether or not to perform control of various operation processes. For example, if the control does not operate normally for some reason, the state where the control panel 204 does not operate normally is avoided by selecting the absence of control. be able to.

  FIG. 3 is a schematic view showing the operation of the master plate discharge by the main part of the stencil printing apparatus according to stages A to G.

  Referring to FIG. 3, in the standby state of stage A, the substantially outer peripheral surface excluding the master clamper 102 in which the first length used master 61 b that is the master wound around the printing drum 101 last time is closed. It shows a state of being arranged along. The state after moving the plate removal position in the stage B shows a state in which the printing drum 101 is subsequently rotated clockwise to the plate removal position to enter a plate discharge standby state.

  Further, in the state of starting the plate removal at the stage C, the master clamper 102 in the printing drum 101 is opened and the plate removal of the used master 61b having the first length as the master wound last time is started. In the plate feeding start state in the stage D, the printing drum 101 is rotated clockwise to the plate feeding position while continuing to remove the plate from the used master 61b having the first length, and the master (printing) currently wound from the plate making apparatus 90 is printed. A state is shown in which conveyance of the master master 61a having the second length, which is a master corresponding to the small size of the paper 62, is started.

  Further, in the plate removal master cutting state in stage E, the plate removal master cutting unit 200 sets the used master 61b having the first length as the plate removal master, and the printing drum 101 is rotated clockwise to the cutting position, and the remaining length is printed. A state is shown in which cutting is performed at a predetermined length reaching a length for covering a portion that is not covered with a master having a length corresponding to the small size of the paper 62. In the state after cutting the master plate in Step F, after the used master 61b having the first length is cut, the printing drum 101 is rotated clockwise while the fragment remains on the printing drum 101 as a remaining master. Show.

  In addition, in the master continuous feeding winding completion state of the stage F, the plate master 61a having the second length, which is the master to be wound this time, is continuously fed to the printing drum 101 that rotates clockwise, Although the winding completed state is shown, at this time, the end of the second master making master 61a of the second length newly attached to the end of the remaining master of the used master 61b is a predetermined length. It shows how they are worn so that they overlap.

  That is, in the master continuous feeding winding completion state of the stage F, the remaining master of the used master 61b, which is the previous master, and the master master 61a, which is the current master, partially overlap each other. This shows that the ink leakage can be prevented in advance, thereby preventing the printing paper 62 and the press roller 103 from becoming dirty due to ink leakage.

  FIG. 4 is a schematic diagram for explaining the length and printing pressure range of the master 61 wound around the printing drum 101 of the stencil printing apparatus of the embodiment.

  Referring to FIG. 4, the length (first length) of the master 61 (used master 61 b) wound around the printing drum 101 can cover all of the opening portions of the printing drum 101. The maximum master length L can be set as it is, and the maximum master length L becomes the printing pressure range α as it is, and the second length L1 of the plate-making master 61a corresponding to the small size of the printing paper 62 is also used as it is. β. The second length L1 of the master-making master 61a may be a fixed value or a variable value.

  Also, the length L2 in FIG. 4 indicates the remaining master length when the used master 61b is cut by the plate removal master cutting unit 200 and the remaining master remains on the printing drum 101. When the length L2 of the remaining master 61 and the second length L1 of the master-making master 61a overlaps is L3, the relationship L2 = L−L1 + L3 is established. The length L2 of the remaining master is a fixed value when the second length L1 of the master-making master 61a is a fixed value, and is a variable value when the second master L is a variable value. Incidentally, the relationship of L2 = L−L1 + L3 is similarly established even when the variable value is used.

  Further, the length L3 is a length in which the second length L1 of the master-making master 61a and the length L2 of the remaining master are overlapped, and ink leakage from between the masters can be prevented by this overlapping portion. Incidentally, the length L4 in FIG. 4 indicates the minimum value of the master length that remains on the logical printing drum 101 of the used master 61b. In this case, the length L4 corresponds to a pattern that does not ensure the overlapping length. Since there is a possibility of causing ink leakage, it is not practical.

  Incidentally, regarding the above-described printing pressure ranges α and β, when the master master 61a has the second length L1, the remaining master of the used master 61b that remains on the printing drum 101 is also wound at the same time. However, the remaining master of the used master 61b is not related to the image punched in the master master 61a having the second length L1 corresponding to the small size of the printing paper 62. Is not perforated, it is impossible to print with a printing pressure, so the printing pressure range β is set.

  FIG. 5 is a schematic diagram for explaining the cutting operation of the master 61 by the evacuation master cutting unit 200 of the stencil printing apparatus of the embodiment. FIG. 5A is a diagram relating to the standby position state, and FIG. ) Is a diagram relating to the cutting position state.

  Referring to FIG. 5A, the standby position state of the cutting operation by the plate removal master cutting unit 200 corresponds to the state immediately before the plate release master cutting state described in the stage E of FIG. The master 61a is supplied and wound around the printing drum 101, and the tip of the used master 61b is wound around the pair of plate release rollers 71a and 71b of the plate release box 74, followed by a stretched midpoint, The discharged master cutting unit 200 is in a state where it can move from the home position retracted in the direction M to a position approaching the middle part of the used master 61b.

  Referring to FIG. 5B, the cutting position state of the cutting operation by the plate removal master cutting unit 200 corresponds to the plate removal master cutting state described in step E of FIG. 3, and the plate removal master cutting unit 200 has been used. A heat ray cutter parallel to the axial direction of the printing drum 101 is pressed against the middle part of the master 61b in the direction M, and the middle part where the used master 61b is stretched is cut by the heat generated by the heat ray cutter. . The reason why the hot-wire cutter is used in the plate removal master cutting unit 200 is that it can be used in the vicinity of the printing drum 101 and can be installed in as little space as possible. A cutting means may be used.

  In any case, the cutting operation position of the plate removal master cutting unit 200 includes the standby position other than when cutting the used master 61b shown in FIG. 5A and the used master 61b shown in FIG. 5B. There are two movement positions, a cutting position where the heat ray cutter is pressed against and cut, and the master discharge master cutting unit 200 has moving means for moving to that position. Although high accuracy is required for stopping the moving means at the cutting position, if the stopping accuracy is poor, there is a possibility that the printing master 101 will come into contact with the printing drum 101 and the printing drum 101 may be damaged. It is.

  In the stencil printing apparatus according to the above-described embodiment, the evacuation master cutting unit 200 according to the operation instruction of the control device 210 is wound around the previous printing drum 101 between the printing drum 101 and the evacuation apparatus 70 regardless of the conditions such as the number of originals. When the preprinted master 61a having the first length is discharged as the used master 61b that has been used, the preprinted master having the second length to be wound this time with a length corresponding to the small size of the printing paper 62 61a covers a portion of the opening portion of the printing drum 101 that is not covered, the used master 61b having the first length wound around the printing drum 101 the last time is cut at a predetermined length, and the remaining master is removed from the printing drum 101. Can remain. Further, the end of the master master 61a having the second length that is newly mounted on the end of the remaining master on the printing drum 101 according to the operation instruction of the control device 210 by the mounting means has a predetermined length. It can be mounted so as to overlap. For this reason, the opening portion of the printing drum 101 can be covered without using the maximum size plate as the last plate before leaving the printing drum 101, and the master 61 can be used more economically with the same usability as before. Can be reduced.

  By the way, the basic functions of the stencil printing apparatus described above are the stencil plate making processing step for making the master as the stencil sheet by the stencil making means, and the master made by the cutting means by the first length or the second length. A cutting process step for cutting the sheet, a mounting process step for conveying the cut master by the mounting means and mounting it on the outer periphery of the printing plate cylinder (printing drum 101), and a master used at the time of discharging by the plate discharging means. A stencil printing method comprising: a stencil processing step for removing the stencil from the plate cylinder; and a control processing step for controlling operation processing in the stencil plate making processing step, cutting processing step, mounting processing step, and stencil processing step by the control means. In other words. The special feature of the stencil printing method in this case is that the master master cutting means cuts the first length master between the plate cylinder and the plate discharging means to a predetermined length at the time of discharging the plate according to the operation instruction in the control processing step. In addition to having a plate removal master cutting process step that leaves the remaining master to remain in the plate cylinder, in the mounting process step, a second operation is performed on the remaining master in the plate removal master cutting process step according to the operation instruction in the control process step. There is to install a master of length.

  Further, in the stencil printing method, the printing means presses the recording medium against the plate cylinder in accordance with the operation instruction in the control processing step, and the printing pressure range adjustment means performs the operation instruction in the control processing step. And a printing pressure range adjustment processing step for adjusting the pressing printing pressure range by the printing means in accordance with the length of the master according to the control unit, and in the cutting processing step, according to the operation instruction in the control processing step, the second As a master of length, cut with a length corresponding to the small size of the recording medium, and in the mounting process step, on the plate cylinder on the plate cylinder according to the operation instruction in the control process step, against the end of the remaining master in the discharge master cutting process step It is preferable that the second length of the master that is obtained in the cutting process step and that is newly mounted overlaps the end of the master with a predetermined length. .

  The detailed configuration of the stencil printing apparatus described with reference to FIG. 1 can be variously changed. In such a case, the processing operation of the master stencil cutting unit 200 characteristic of the present invention can be applied. The printing apparatus is not limited to the disclosed form.

50 Machine body 51 Paper feed tray 52 Paper discharge tray 60 Original 61 Master (stencil paper)
61a Master-making master 61b Used master 62 Printing paper 70 Plate-release device 71a, 71b Plate-release peeling roller pair 72a, 72b Plate-release conveying belt pair 73a, 73b Plate-release roller pair 74 Plate-release box 75 Compression plate 80 Document reading unit 80A Document tray 81 Separation roller 82a, 82b Front document conveying roller pair 83a, 83b Rear document conveying roller pair 84 Separating blade 85 Contact glass 86 Fluorescent lamp 87 Mirror 88 Lens 89 Image sensor 90 Plate making device 91 Thermal head 92 Platen roller 93a, 93b Tension roller pair 94a, 94b Plate roller pair 95 Cutter 100 Printing drum section 101 Printing drum (plate cylinder)
DESCRIPTION OF SYMBOLS 102 Master clamper 103 Press roller 104 Ink supply pipe 105 Ink roller 106 Doctor roller 107 Ink reservoir 110 Paper feeding apparatus 114 Paper discharge peeling claw 115 Adsorption paper discharge entrance roller 116 Adsorption paper discharge exit roller 117 Conveying belt 118 Adsorption fan 120 Printing pressure Unit 130 paper discharge device 140 paper feed roller 142 registration roller pair 200 discharge plate master cutting unit 201 discharge plate unit 202 image reading unit 203 paper discharge unit 204 operation panel 205 storage unit 206 printing unit 207 plate making unit 208 paper feed unit 209 printing pressure range adjustment Part 210 control device

Japanese Patent Laid-Open No. 2005-22139

Claims (4)

A stencil plate making means for making a master as a stencil sheet, a cutting means for cutting the master that has been made by a first length or a second length, and a plate cylinder for printing by conveying the cut master A mounting means for mounting on the outer periphery of the sheet, a plate discharging means for peeling the master used at the time of discharging the plate from the plate cylinder, and controlling operation processing of the stencil plate making means, the cutting means, the mounting means, and the plate discharging means. A stencil printing apparatus comprising a control means,
The master is provided between the plate cylinder and the plate discharging means, and the master having the first length is cut at a predetermined length at the time of discharging to leave the remaining master on the plate cylinder in accordance with an operation instruction of the control means. It is equipped with a master for cutting out the plate to leave
The stencil printing apparatus, wherein the mounting unit mounts the master having the second length on the remaining master in accordance with an operation instruction of the control unit.   2. The stencil printing apparatus according to claim 1, wherein printing means presses a recording medium against the plate cylinder in accordance with an operation instruction of the control means, and printing according to the length of the master in accordance with the operation instruction of the control means. Printing pressure range adjusting means for adjusting the pressing printing pressure range by the means, and the cutting means is configured to reduce the size of the recording medium as the master of the second length according to an operation instruction of the control means. The attachment means is cut to a length corresponding to the size, and the attachment means is newly attached to the end of the remaining master on the plate cylinder in accordance with an operation instruction of the control means. A stencil printing apparatus, wherein the end of the master is mounted so as to overlap with a predetermined length. A stencil plate making step for making a master, which is a stencil paper, by a stencil plate making means, a cutting step for cutting the master plate made by a cutting means by a first length or a second length, and a mounting means. A mounting process step for conveying the cut master and mounting it on the outer periphery of the printing plate cylinder, a plate discharging process step for peeling off the master used at the time of plate discharging from the plate cylinder by a plate discharging means, and a control means In the stencil printing method, comprising: a stencil plate making process step, a cutting process step, a mounting process step, and a control process step for controlling an operation process in the evacuation process step.
According to the operation instruction in the control processing step, the master master cutting unit cuts the first length of master between the plate cylinder and the plate discharging unit at a predetermined length during the plate discharging, and the remaining master is a plate. A plate removal master cutting process step to remain in the cylinder;
The stencil printing method is characterized in that, in the mounting process step, the second length of the master is mounted on the remaining master in the discharged master cutting process step in accordance with an operation instruction in the control process step.   4. The stencil printing method according to claim 3, wherein a printing unit presses a recording medium against the plate cylinder in accordance with an operation instruction in the control processing step and prints, and a printing pressure range adjusting unit performs the control process. A printing pressure range adjustment processing step for adjusting the pressing printing pressure range by the printing unit in accordance with the length of the master according to the operation instruction in the step, and the cutting processing step includes the control processing According to the operation instruction in step, the master of the second length is cut to a length corresponding to the small size of the recording medium, and in the mounting process step, on the plate cylinder according to the operation instruction in the control process step Before the new master is obtained by the cutting step and applied to the end of the remaining master in the discharging master cutting step. Stencil printing method in which the end portion of the second length of the master, characterized in that the mounting so as to overlap at a predetermined length.