JP4312464B2 - Stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a master roll in which a heat-sensitive stencil master (hereinafter simply referred to as a master) as a plate (base paper) used for stencil printing is rolled.LeThe present invention relates to a stencil printing apparatus to be used.
[0002]
[Prior art]
A general stencil printing apparatus performs a printing operation using a master or ink supply. The master used here is a porous support made of a thermoplastic resin film (thickness of 1 to 3 μm is generally used) and Japanese paper fiber, synthetic fiber, or a mixture of Japanese paper fiber and synthetic fiber. A master roll in which a laminate structure obtained by bonding together is wound into a roll is mainly used.
[0003]
At the time of printing, heating perforation plate making is performed by a plate making apparatus equipped with a thermal head based on read information of a document image, and a predetermined size determined according to the size of the plate cylinder (including a holding portion by a clamper) Is cut by the cutting means. The master thus made is wound on the outer peripheral surface of a plate cylinder which is a porous cylinder so that the thermoplastic resin film surface is on the outside.
[0004]
The printing paper is fed from the paper feeding device to the plate cylinder, and the printing paper is pressed by a pressing member such as a press roller while ink is supplied to the plate cylinder opening by the ink supply means provided inside the plate cylinder. In the process of being sent while being continuously pressed to the plate-making master on the outer peripheral surface of the cylinder, the ink leached from the plate cylinder opening part and the master punching part is transferred to the printing paper and printing is performed.
[0005]
The master roll is obtained by winding a master around a cylindrical core, and is consumed with printing. At least one part to be detected with a different transmittance is provided at the substantial rearmost part of the master roll in order to automatically detect when the remaining part of the master roll is reduced and it is consumed to near the core. ing.
On the other hand, the stencil printing apparatus is provided with detection means for detecting the provided end mark, and detects the detection portion. When the remaining part of the master roll is reduced, the operator is warned based on this detection, and the document feed is stopped (see, for example, Patent Document).
[0006]
The master wound around the master roll is cut into a predetermined size by a cutting means, and is fed into a plate cylinder by being added to a feed roller provided downstream of the cutting means in the conveying direction. The detection part is provided immediately before the core part of the master roll in order to effectively use the master.
[0007]
Since the remaining amount of the master up to the previous time is unknown, if there is a master that has not reached one plate but has a remaining amount close to one plate, the detected portion of the master is detected by the detection means, and the master When the end is warned, the downstream side of the master may have been uncut and sent by an amount close to one plate downstream from the cutting means, and the leading end may have already reached the plate cylinder side. .
[0008]
In such a case, the master roll must be removed from the stencil printing machine, including the downstream part that reaches the plate cylinder, but the plate cylinder clamper is released and the holding by the feed roller is released. This is accompanied by complicated work.
[0009]
On the other hand, as a conventionally practiced technique, there is a technique in which a reflective sensor is used as a detection means, and a master of a master roll forms a black belt-like detection portion at a position corresponding to one plate length from a core portion. In such a technique, since the reflection type sensor to be used has a variation in sensitivity, as a means for ensuring accuracy, the target reflection type sensor is simulated by a jig master with no master, and the output voltage is matched. A threshold was set.
[0010]
In such a conventional technique, the master roll has to be printed in advance by complicated printing means in order to produce a black belt-like detection portion, and an expensive reflective sensor is used as the detection means. In addition, since the setting adjustment of the threshold value is necessary, the work is complicated, and a backup RAM for storing the threshold value at the time of adjustment is necessary. It was also expensive.
[0011]
[Patent Literature]
Japanese Patent Laid-Open No. 9-229953
[0012]
[Problems to be solved by the invention]
  An object of the present invention is to detect a master end by a simple means and to easily replace a master row.LeIt is to provide a stencil printing apparatus to be used.
[0013]
[Means for Solving the Problems]
  In order to achieve the object, the present invention has the following configuration.
(1). A stencil printing apparatus in which at least a plate making device and a plate discharging device are arranged around a plate cylinder provided with a clamper for adding a master,
  The plate making apparatus comprises: a support means for supporting a master roll from an upstream side in the master feed direction; a thermal head for punching and making a master drawn from the master roll supported by the support means; and A platen roller that conveys while contacting the thermal head, a cutting means that cuts the master, and a feed roller that feeds the master toward the plate cylinder are disposed in order, and the plate discharging device is wound around the plate cylinder. In the stencil printing apparatus provided with a conveying means that grips one end of the mounted master and pulls it out in the direction of plate removal,
  The supporting means includes, as the master roll, a second mark provided on one side in the master width direction at the rearmost part close to the core of the master wound in a roll shape, and a front side 1/2 of the second mark. A master roll having a first mark provided on the other side in the master width direction at the position of the plate (however, the 1/2 plate can be wound around the plate cylinder to which the master is mounted) When the maximum size plate is a single plate, the plate is half that length.)Two detection means for detecting the first mark and the second mark are arranged opposite to each other in the width direction of the master in the vicinity of the support means, and the detection means uses the detection means. Control means is provided for controlling each drive of the plate making apparatus, the plate discharging apparatus, and the plate cylinder in accordance with the feed amount of the master at the time of mark detection (Claim 1).
(2). (1) In the stencil printing apparatus according to (1),As the master roll, the master wound in the form of a roll has light transparency that can be detected by a transmission type detecting means, and the mark is light impermeable.(Claim 2).
(3). (1)Or (2)In the described stencil printing apparatus,When the control means first activates the stencil printing apparatus and the second mark is first detected by the detection means, and the feed amount of the master at that time is a length capable of feeding and discharging. , Stop the transport of the master, cut the master by the cutting means, and then feed and discharge the plate(Claim 3).
(4). (1)Or (2)In the described stencil printing apparatus,The stencil printing apparatus is provided with warning means for warning that there is no master remaining amount, and the control means first detects the second mark after the stencil printing apparatus is activated. When the feed amount of the master at that time is not long enough to feed the master, the conveyance of the master is stopped, and the warning means warns that there is no remaining master.(Claim 4).
(5).(1) or (2)In the described stencil printing apparatus,The control means, after starting the stencil printing apparatus, is the first mark first detected by the detection means, and when the feed amount of the master at that time is less than 1/2 plate, The second mark is conveyed until it is detected by the detecting means, and the master is cut by the cutting means, and then the plate is fed and discharged.(Claim 5).
(6). (5) In the stencil printing apparatus described in (5), the stencil printing apparatus includes warning means for warning that there is no remaining master amount, and the control means first detects the stencil printing apparatus after the stencil printing apparatus is started. The first mark is the first mark. When the feed amount of the master at that time is ½ plate or more, after feeding the length of one plate, the master is cut by the cutting means for printing. Furthermore, the second mark is conveyed until it is detected by the detection means, and the warning means means that there is no remaining master by the warning means or the cutting means is used for cutting according to the feed amount of the master at the time of detection. Control was made so that the plate and the plate were discharged (Claim 6).
[0014]
DETAILED DESCRIPTION OF THE INVENTION
[1] Stencil printing device
FIG. 1 shows an overall configuration of a stencil printing apparatus as an image forming apparatus having a paper feeding device to which the present invention is applied. The stencil printing apparatus 1 has the structure of a well-known thermosensitive digital plate-making integrated stencil printing apparatus, and a plate cylinder 3 as an image carrier drum that is in a state where an image is carried by winding a master-made master 2 around an outer peripheral surface; A plate making apparatus 4 arranged on the upper right side of the plate cylinder 3 for making the master 2, and a plate removing apparatus 5 for peeling off the used master 2 arranged on the upper left side of the plate cylinder 3 from the plate cylinder 3, A sheet feeding device 8 that feeds printing paper 7 as a sheet-like medium placed below the plate making device 4 and stacked on the sheet feeding tray 6, and is fed from the sheet feeding tray 6 side provided in the sheet feeding device 8. A registration roller 9 that conveys the printed printing paper 7 to the printing unit at a predetermined timing at which the image of the master 2 wound around the plate cylinder 3 can meet with the printing unit is disposed below the printing cylinder 3. The printing paper 7 being fed is pre-made on the plate cylinder 3 A printing pressure device 10 that performs printing by being pressed against the master 2; a document reading device 12 that is positioned above the plate cylinder 3, the plate making device 4, and the plate discharging device 5; An air knife 13 and a paper discharge claw 14 for peeling off the printed printing paper 7 arranged on the left side and printed by the printing pressure device 10 from the plate cylinder 3, and a paper discharge unit for transporting the peeled printing paper 7 15, a paper discharge table 16 on which the printing paper 7 conveyed by the paper discharge unit 15 and discharged from the stencil printing apparatus 1 is stacked, and an operation panel (not shown) for operating the stencil printing apparatus 1 for printing. It is configured.
[0015]
The plate cylinder 3 has a well-known porous cylindrical shape and is rotatably supported around the drum shaft 17. The plate cylinder 3 can be variably rotated by a main motor (not shown). An openable and closable clamper 18 that clamps the front end of the master 2 is provided on one bus bar of the outer peripheral portion of the plate cylinder 3. Inside the plate cylinder 3, an ink supply means 19 for supplying ink from the inner peripheral surface of the plate cylinder 3 toward the outer peripheral surface is disposed.
[0016]
The master 2 is made of a thermoplastic resin film made of polyester or the like and bonded with Japanese paper or the like as a porous support, but is not limited to this, and only a very thin substantially thermoplastic resin film is used. It is also possible to use
[0017]
First, when the operator sets a document 11 to be printed on a document tray (not shown) of the document reading device 12 and presses a start key (not shown) on the operation panel in order to start plate making, the same plate discharging process is performed in the plate cylinder 3. To be executed. The plate cylinder 3 rotates in the counterclockwise arrow a ′ direction opposite to the arrow a direction indicating the clockwise direction in the figure, and the used master 2 wound around the outer peripheral surface of the plate cylinder 3 is replaced with the plate cylinder 3. The plate discharging process is completed by being discharged into the plate discharging box 20 of the plate discharging apparatus 5 while being gradually peeled off and conveyed from the outer peripheral surface of the plate.
[0018]
In parallel with the plate removal process, the document reading unit 12 operates to read the document. The detailed configuration and operation relating to the document reading is performed by, for example, a known “reduction-type document reading method”. The original stripe-read image is finally subjected to photoelectric conversion by an image sensor composed of a photoelectric conversion element such as a CCD (charge coupled device). The photoelectrically converted electric signal is converted into a digital image signal by being transmitted to an analog / digital (A / D) conversion board (not shown).
[0019]
In parallel with the document reading operation, a plate making / plate feeding process is performed in the plate making apparatus 4 based on the digital image signal. Due to the rotation of the platen roller 22 pressed against the thermal head 21, the master 2 is pulled out from the master roll 23 and conveyed downstream of the master conveyance path.
[0020]
A large number of minute heating elements arranged in a line in the main scanning direction of the thermal head 21 with respect to the master 2 transported in this way include the A / D conversion board and the subsequent plate-making control board (not shown). The thermoplastic resin film of the master 2 that is selectively heated in accordance with the digital image signal sent after being subjected to various processes and is in contact with the generated heating element is melt-pierced.
[0021]
In this way, image information is written as a drilling pattern (image) by position-selective melt drilling of the master 2 according to the image information. The master 2 that has been subjected to plate making after image information is written is sent from the downstream side in the conveying direction toward the outer peripheral side of the plate cylinder 3 by the rotation of the sending roller pair 24, and is in the plate feeding position state shown in the figure. It moves toward the clamper 18 in which the body 3 is expanded. At this time, the used master 2 has already been removed from the plate cylinder 3 by the plate removing process. When the leading end, which is the end on the downstream side in the transport direction of the master-making master 2, is clamped by the clamper 18 on the plate cylinder 3 at a fixed timing, and the plate cylinder 3 rotates in the direction of arrow a in the drawing, The master 2 that has been subjected to the plate making is gradually wound around the outer peripheral surface.
[0022]
The rear end portion of the master 2 has been cut to a certain length by the operation of the cutting means 25 provided in the plate making apparatus 4 after completion of the master making, so that the master 2 is completely wound around the outer peripheral surface of the plate cylinder 3. When loaded, the so-called plate feeding process ends.
[0023]
When the master 2 that has been subjected to plate making is wound around the outer peripheral surface of the plate cylinder 3 in this way, the plate making / plate feeding process is completed and the printing process is started. The paper feed tray 6 is raised by well-known means (not shown) until the uppermost printing paper 7 loaded on the paper feed tray 6 contacts the calling roller 26. The uppermost printing paper 7 in contact with the calling roller 26 is conveyed by the rotating operation of the calling roller 26, and only one printing paper 7 is separated by the pair of separation rollers 27, and the pair of registration rollers 9. It is sent toward.
[0024]
At this time, even after the front end of the printing paper 7 to be fed comes into contact with the portion immediately before the nip portion of the registration roller 9, a slight feed is given by the separation roller 27, so that the printing paper 7 has a sheet shape indicated by an arrow c. The central portion in the medium conveyance direction, that is, the portion between the registration roller 9 and the separation roller 27 is stopped in a state of being bent upward.
[0025]
When the printing operation starts, the plate cylinder 3 starts to rotate at a rotational speed corresponding to a predetermined linear speed. On the inner peripheral side of the plate cylinder 3, ink is supplied from an ink supply distributor (not shown) to an ink reservoir 30 formed between an ink roller 28 and a doctor roller 29 as ink supply means. 28 and the doctor roller 29 are kneaded and extended by rotating, and are uniformly attached to the outer peripheral surface of the ink roller 28.
[0026]
The remaining amount of ink is detected by, for example, a well-known ink detecting means according to FIG. 2 of Japanese Patent Application Laid-Open No. 5-229243, and when the ink is low, ink is supplied from the ink supply distributor. Thus, ink is supplied to the inner peripheral side of the plate cylinder 3 by the ink roller 28 that is in contact with the inner peripheral surface while rotating in the same direction as the rotation direction of the plate cylinder 3 and in synchronization with the rotation speed of the plate cylinder 3. The
[0027]
The printing pressure device 10 is mainly configured by an ink roller 28, a press roller 31, a press roller bracket (not shown), a press roller tension including a spring (not shown), and a press roller cam (not shown). The press roller 31 has a function as a pressing unit that presses the printing paper 7 fed by the registration roller 9 at a predetermined timing against the plate cylinder 3 to form a printed image on the printing paper 7.
[0028]
The press roller 31 is rotatably supported at one oscillating end of the press roller bracket, and is provided so as to be able to contact with and separate from the outer peripheral surface of the plate cylinder 3 by a known mechanism including a press roller tension and a press roller cam. Yes.
[0029]
When the printing paper 7 is fed by the registration roller 9 at a predetermined timing synchronized with the rotation of the plate cylinder 3, between the plate cylinder 3 and the press roller 31, that is, to the printing unit 32 as an image forming unit. The press roller 31 that has been separated below the outer peripheral surface of the plate cylinder 3 is swung in synchronization with the plate cylinder 3, and is pressed against the master 2 that has been made on the outer periphery of the plate cylinder 3.
[0030]
As a result, due to the adhesive force due to the viscosity of the ink that has oozed out from the porous portion of the plate cylinder 3, the master 2 that has been subjected to plate making comes into close contact with the outer peripheral surface of the plate cylinder 3, and at the same time, the ink from the perforated pattern portion of the master 2 that has already been made. Ooze out, and the oozed ink is transferred to the surface of the printing paper 7 to form a desired print image.
[0031]
The printing paper 7 on which the print image is formed is separated and peeled from the plate cylinder 3 by the air knife 13 and the paper discharge claw 14 when the leading end thereof reaches the vicinity of the paper discharge unit 15. The printed printing paper 7 that has been separated and peeled off is conveyed in the direction indicated by the arrow b by the paper discharge unit 15 and flies toward the paper discharge table 16. In this way, so-called “printing” or “trial printing” is completed.
[0032]
Next, set the number of prints and print speed using the numeric keypad (not shown) on the operation panel, and press the start key again. Is repeated for the number of printed sheets, and all the processes of stencil printing are completed.
[0033]
  [2] Details of plate making apparatus and plate discharging apparatus (claims)1Relation)
  Of the stencil printing apparatus shown in FIG. 1, the detailed configuration of a plate making apparatus and a plate discharging apparatus that are closely related to the present invention will be described with reference to FIG. The plate making apparatus 4 supports the master roll 23 in which the master 2 is wound around the core portion 23a in a roll shape from the upstream side in the feed direction indicated by the arrow d of the master 2 so as to be rotatable by the core portion 23a. Support means 33 for applying a driving force, a thermal head 21 for punching and making the master 2 drawn from the master roll 23 supported by the support means 33, and a platen roller 22 for transporting the master 2 while contacting the thermal head 21 A cutting means 25 for cutting the master 2 and a feed roller pair 24 (feed roller) for feeding the master 2 toward the plate cylinder 3 are arranged in this order.
[0034]
Here, a drive source for driving the cutting means 25 is a motor M1. The drive source that drives the feed roller pair 24 and the drive source that drives the platen roller 22 are common, and this common drive source is referred to as a motor M2 here. The feed roller pair 24 and the platen roller 22 are connected by an intermediate gear and are driven to rotate synchronously by a motor M1 which is a common drive source. The support means 33 is also provided with a motor as a drive source that applies a rotational drive force to the core 23a. Since this motor is also driven in synchronism with the motor M1, it is included in the operation of the motor M2 in order to avoid complication of the description, and is not particularly described. The plate cylinder 3 is driven by a motor M3 capable of forward and reverse rotation.
With respect to the plate discharging device 5, the used master is held between a pair of upper and lower belts 35 and 36 and sent to the plate discharging box 20 (see FIG. 1). Of the pair of upper and lower belts 35, 36, the belt 36 positioned on the lower side holds the rear end of the master from a position separated from the plate cylinder 3 while the drive side roller 34 r supporting the belt 36 rotates. It is accompanied by a lateral movement that moves to a position where it can. Here, to simplify the explanation, it is assumed that the motor M4 performs both the rotational driving of the belt and the lateral movement operation. The pair of upper and lower belts 35 and 36 constitute conveying means for holding one end portion of the master 2 wound around the plate cylinder 3 and pulling it out in the plate discharging direction indicated by the arrow e.
[0035]
Although the support means 33 does not ask | require a form, as mentioned above, it supports the core part 23a of the master 2 wound by roll shape so that rotation is possible. The detection means S1 and S2 face each other in the width direction of the master 2 on the transport path in the vicinity of the support means 33 and the master 2 going to the nipped portion between the platen roller 22 and the thermal head 21. It is arranged opposite to the position, that is, the width direction of the master. These detection means S1 and S2 will be described later.
[0036]
  [3] Master (claim)1Relation)
  A master according to the present invention will be described with reference to FIG. In FIG. 3, the master 2 is wound around a shaft-shaped core portion 23a. In the unused state, since it is wound in a roll shape, it is a roll wound around the core portion 23a as shown in FIGS. Here, for the sake of explanation, a state in which the state close to the core part 23a is used, and the rearmost part (the part close to the core part) with a small remaining part is virtually drawn is shown.
[0037]
A second mark (hereinafter also referred to as black seal B2) on one side in the master width direction (axial direction of the core portion 23a) is the rearmost portion near the core portion 23a of the master 2 wound in a roll shape, and this black seal It has a first mark (hereinafter also referred to as a black seal B1) provided on the other side of the master width direction at a position corresponding to 1/2 of the front side (arrow d direction side) of B2. However, here, the ½ version refers to a ½ length plate when the maximum size plate that can be wound around the plate cylinder 3 to be used by the master 2 is one plate. And In FIG. 3, the distance between the black seal B1 and the black seal B2 is shown in half.
[0038]
(Related to claim 2)
  It is sufficient that the first mark and the second mark are marks that can be detected by the detection means S1 and S2. In this example, since a transmission type sensor that detects light is used as the detection means S1 and S2, the master 2 has light transmissibility that can be detected by the detection means S1 and S2, and the first mark, The 2 marks were light opaque. In practice, an extremely simple means of applying a black seal is sufficient. Here, the case where a sticker is affixed is illustrated as black stickers B1 and B2.
[0039]
[4] Relationship between black seal and detection means
As shown in FIG. 4, the detection means S1 and the detection means S2 are arranged to face each other in the width direction of the master 2, and are fixed to the immovable member. For example, in the detection unit S1, the U-shaped light emitting unit and the light receiving unit face each other so that the widthwise end of the master 2 is sandwiched between the upper and lower sides. Accordingly, when the black seal B1 passes through the detection means S1 during the conveyance process of the master 2, the light receiving unit does not detect the light from the light emitting unit. The seal B1 can be detected. Similarly, the black seal B2 can be detected for the detecting means S2.
[0040]
[5] Control means (claims)1Relation)
  Control means for controlling each drive of the plate making device 4, the plate discharging device 5, and the plate cylinder 3 in accordance with the feed amount of the master 2 when the marks (black seal B1, black seal B2) are detected by the detection means S1, S2 will be described. To do.
[0041]
In FIG. 5, the control means 40 is composed of a CPU (Central Processing Unit) as a main part. The control means 40 is configured to receive the outputs of the detection means S1 and S2. The control means 40 performs arithmetic processing based on the inputs from the detection means S1 and S2, and outputs outputs for driving them to the motors M1 to M4 and the error display section 41. The error display unit 41 is an example of a warning unit that warns that there is no remaining master level. For example, the error display unit 41 is configured as an electrical or mechanical unit that appeals to the five senses of the operator, such as turning on a lamp or sounding a buzzer.
[0042]
  [6] Contents of control such as detection of rear end of master roll by control means (claims)3~6Relation)
  The master roll 23 is used and exchanged by control such as rear end detection using the control means 40 in the plate cylinder 3, plate making device 4, and plate discharge device 5 of the stencil printing apparatus 1. The details of the control will be described with reference to the flowcharts and diagrams of FIGS. In the flowcharts shown in FIGS. 6 and 7, “A” is the master feed amount (count value of the counter built in the control means). This can be known by detecting the rotational speed of the motor or the rotational speed of the shaft portion of the platen roller 22 in the control means 40. In the stencil printing apparatus, “X” is the length of the master conveyance path from the position of the cutting means 25 to the holding position by the clamper 18 when the plate cylinder 3 is in the rotational position for receiving the master. If the master can be sent by the length of “X”, the plate can be fed even if it cannot be printed by cutting at that position. Therefore, automatic feeding and discharging are possible.
[0043]
In the stencil printing apparatus 1, a master roll is mounted on the support means 33. It is unclear how much master power is left after printing has been completed and the power is turned off. Under such a premise, the control contents such as detection of the rear end of the master roll by the control means will be described.
[0044]
6.1 Control pattern 1
In FIG. 6, “start” is performed by turning on the main power supply of the stencil printing apparatus 1. In step P1, it is checked whether or not the detection means S1 and S2 are turned on. The master tip is in a state of being cut by the cutting means 25. If the detection means S1 is on, it can be sent until the detection means S2 is further turned on, but the possible master feed amount is the half plate between the black seals B1 and B2 (first mark, second mark). There is only length. If the detecting means S2 is on, there is no remaining amount. Therefore, if any of the detection means is on, the process proceeds to step P2, and the error display unit 41 displays a lamp indicating that there is no master.
The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0045]
6.2 Control pattern 2
In FIG. 6, when the detection means S1 or S2 is not on in step P1, the remaining amount of master is at least 1/2 version or more. Proceeding to step P3, it is checked whether or not it is in the plate making mode. If it is not the plate making mode, the process returns. If it is the plate making mode, preparations for starting the conveyance of the master are made in step P4.
[0046]
In step P5, the motors M1, M2, M3, etc. are turned on and the master is transported. Accordingly, the count of the master feed amount A is started, and the count is incremented in step P6.
[0047]
If the remaining amount of the master is very large, after passing through Steps P7 and P8 and the feed amount A reaches one plate in Step P9, the feed motor that was turned on in Step P10 is turned off to turn off the master. Stop conveyance, clear the count, and return to return.
[0048]
FIG. 8 illustrates the state of the master 2 in this control pattern 2. In FIG. 8, [S · P] is the set position where the core 23a is set on the support means 33, [C · P] is the cut position by the cutting means, and the hatched portion is “Start Corresponds to the feed amount A conveyed by the execution of the procedure (the same display is shown in FIGS. 9 to 14 described later).
[0049]
In this example, the feed amount is up to step P7. 8 exemplifies a case where the master roll is unwound from the position of the support means 33 as a starting point, and the black seals B1 and B2 (first mark and second mark) of the master are illustrated. It shows that there is still a considerable margin until the detection means detects it.
[0050]
6.3 Control Pattern 3 (Claims3Relation)
  In FIG. 6, the master feed amount is counted up at step P6 and conveyed. In step P7, the black seal S1 (first mark) is not detected by the detection means S1, and first black is detected by the detection means S2 in step P8. When the seal B2 (second mark) is detected, the process proceeds to Step P11, where A ≧ X? Is checked. If A.gtoreq.X, since the feed amount A up to that time is equal to or exceeds X, automatic feeding and discharging are possible.
[0051]
Therefore, in step P12, the motor for master feeding is turned off, the master conveyance is stopped, the counter value up to that time is cleared, the master is cut by the cutting means, and then the process proceeds to step P13, where the plate cylinder 3 In step P14, the motor M4 is driven to automatically feed and discharge the plate.
[0052]
Since there is no remaining master supported by the support means 33, the error display unit 41 displays a lamp indicating that there is no master in step P15. The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0053]
FIG. 9 illustrates the state of the master 2 in this control pattern 3. In FIG. 9, the hatched portion corresponds to the feed amount A conveyed by the execution of this procedure from the “start”. In this example, the feed amount is up to step P8. The master remaining on the plate making apparatus 4 after cutting the master in step P12 is a portion excluding the shaded portion in FIG.
[0054]
6.4 Control Pattern 4 (Claims4Relation)
  In the control pattern 3, “A ≧ X?” Is checked in step P11 and “A ≧ X” is described. In this example, it corresponds to the case where “A ≧ X” is not satisfied, and “A <X”, so that the master has only a remaining amount that cannot be automatically supplied. In such a case, the motor for master feeding is turned off in step P16, the conveyance of the master is stopped, the counter value up to that time is cleared, and the master does not disconnect, and the error display unit 41 does not have a master in step P17. Is displayed as a lamp. The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0055]
FIG. 10 illustrates the state of the master 2 in the present control pattern 4. In FIG. 10, the hatched portion corresponds to the feed amount A transported by executing this procedure from the “start”. In this example, the feed amount is up to step P8. The master remaining on the plate making apparatus 4 is removed from the plate making apparatus 4 including the hatched portion.
[0056]
6.5 Control Pattern 5 (Claims)5Relation)
  In FIG. 6, when the master feed amount is conveyed while being counted up in step P6 and the black seal S1 (first mark) is detected by the detection means S1 in step P7, in step P18 of FIG. “A ≧ 1/2 version?” Is checked. If it is not “A ≧ 1/2 plate?”, It means “A <1/2 plate”, which is not enough for one plate. Therefore, the process proceeds to step P19, where the detection means S2 is the black seal B2 (second plate). When the detecting means S2 is turned on after detecting the mark), the motor for master feeding is turned off in step P20, the master conveyance is stopped, the counter value up to that time is cleared, and the cutting means is cut off. After cutting the master, the process proceeds to step P21 where a winding operation for winding the master around the plate cylinder 3 is performed, and in step P22, the motor M4 is driven to automatically perform the plate feeding and plate discharging operations.
[0057]
Since there is no remaining master supported by the support means 33, the process proceeds to step P23, and the error display unit 41 displays a lamp indicating no master. The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0058]
FIG. 11 illustrates the state of the master 2 in this control pattern 5. In FIG. 11, the hatched portion corresponds to the feed amount A conveyed by the execution of this procedure from the “start”. In this example, the feed amount is up to step P7. The master remaining on the plate making apparatus 4 after cutting the master in step P20 is a portion excluding the hatched portion in FIG.
[0059]
6.6 Control Pattern 6 (Claims)6Relation)
  In the control pattern 5, the case where “A ≧ 1/2 version?” Is not satisfied in step P18 of FIG. 7 has been described. In this example, it corresponds to the case of “A ≧ 1/2 plate”, and since the feed amount of the master 2 is more than ½ plate when the first detection means S1 detects the black seal B1, black If the length of the half plate between the seal B1 and the black seal B2 is inserted, it should be possible to feed at least one plate.
[0060]
The state of the master 2 in this control pattern 4 is illustrated. In FIG. 12, the hatched portion corresponds to the feed amount A transported by execution of this procedure from the “start”. In this example, the feed amount is up to step P7.
[0061]
From this state to the detection of the black seal B2 (second mark) by the detection means S2, it is possible to feed one plate. FIG. 13 exemplifies a state in which one plate has been sent. The amount fed by one plate is shown by hatching in FIG.
[0062]
Thus, in step P24, one plate is fed, in step P25, the master feed motor is turned off, the master transport is stopped, the counter value up to that time is cleared, and the master is cut by the cutting means. Proceeding to P26, a winding operation for winding a master corresponding to the hatched portion in FIG. 13 around the plate cylinder 3 is performed, and a printing operation is performed in Step P27.
[0063]
After printing, the master feed is started again in step P28, and the sheet is conveyed until the detection means S2 detects the black seal B2 (second mark) and turns on. When the master resumes feeding, the master starts feeding from the state where there is no hatched portion in FIG.
[0064]
The processes after Step P28, that is, the processes from Step P11 ′ to Step P17 ′ are the same as the processes from Step P11 to Step P17 in FIG. Therefore, “′” is added to the corresponding step code.
[0065]
If the black seal B2 (second mark) is detected by the detection means S2 in step P28, the process proceeds to step P11 ′, where A ≧ X? Is checked. If A.gtoreq.X, since the feed amount A up to that time is equal to or exceeds X, automatic feeding and discharging are possible.
[0066]
Therefore, in step P12 ′, the motor for master feeding is turned off, the master conveyance is stopped, the counter value up to that time is cleared, the master is cut by the cutting means, and the process proceeds to step P13 ′. A winding operation for winding the master around the cylinder 3 is performed, and in step P14 ', the motor M4 is driven to automatically perform the plate feeding and discharging operation.
[0067]
Since there is no remaining master supported by the support means 33, the error display unit 41 displays a lamp indicating that there is no master in step P15 ′. The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0068]
If “A ≧ X” is not satisfied in step P11 ′, since “A <X”, the master has only a remaining amount that cannot be automatically supplied. In such a case, the motor for master feeding is turned off in step P16 ′, the conveyance of the master is stopped, the counter value up to that time is cleared, and the error display unit 41 in step P17 ′ does not disconnect the master. The lamp without master is displayed. The operator manually removes the master from the support means 33. The master can be easily removed simply by releasing the platen roller 22.
[0069]
【The invention's effect】
  Claim1In the described invention, it is possible to provide a stencil printing apparatus in which the rear end detection of the master and subsequent processing are simple.
[0070]
  In the second aspect of the invention, the mark can be easily attached, for example, by sticking a light-impermeable seal without using complicated printing. Further, a light transmission type sensor can be used as the detection means instead of the reflection type which has been problematic in the past.
[0072]
  Claim3In the described invention, it is possible to prevent the remaining portion of the master from remaining on the master transport path by automatic plate feeding and discharging.
[0073]
  Claim4In the described invention, the operator can accurately know that there is no master remaining amount by the warning means.
[0074]
  Claim5In the described invention, even when the remaining amount of master is less than one plate, the burden on the operator can be reduced by automatic plate feeding and plate removal.
[0075]
  Claim6In the described invention, the warning means can accurately know that the master is used up as much as possible and that there is no remaining master.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of a stencil printing apparatus according to the present invention.
FIG. 2 is a diagram illustrating a main part of a stencil printing apparatus according to the present invention, such as a plate feeding apparatus and a plate discharging apparatus.
FIG. 3 is a perspective view of a rear end portion of a master.
FIG. 4 is a perspective view illustrating a relationship among a master, a mark, and detection means.
FIG. 5 is a block diagram illustrating control means.
FIG. 6 is a flowchart.
FIG. 7 is a flowchart.
FIG. 8 is a diagram illustrating a remaining amount portion of a master.
FIG. 9 is a diagram illustrating a remaining amount portion of a master.
FIG. 10 is a diagram illustrating a remaining amount portion of a master.
FIG. 11 is a diagram illustrating a remaining amount portion of a master.
FIG. 12 is a diagram illustrating a remaining amount portion of a master.
FIG. 13 is a diagram illustrating a remaining amount portion of a master.
[Explanation of symbols]
2 Master
3 plate cylinder
23a core
S1, S2 detection means
B1 1st mark
B2 Second mark

Claims (6)

A stencil printing apparatus in which at least a plate making device and a plate discharging device are arranged around a plate cylinder provided with a clamper for adding a master,
The plate making apparatus comprises: a support means for supporting a master roll from an upstream side in the master feed direction; a thermal head for punching and making a master drawn from the master roll supported by the support means; and A platen roller that conveys while contacting the thermal head, a cutting means that cuts the master, and a feed roller that feeds the master toward the plate cylinder are disposed in order, and the plate discharging device is wound around the plate cylinder. In the stencil printing apparatus provided with a conveying means that grips one end of the mounted master and pulls it out in the direction of plate removal,
The supporting means includes, as the master roll, a second mark provided on one side in the master width direction at the rearmost part close to the core of the master wound in a roll shape, and a front side 1/2 of the second mark. A master roll having a first mark provided on the other side in the master width direction at the position of the plate (however, the 1/2 plate can be wound around the plate cylinder to which the master is mounted) When the maximum size plate is one plate, it is a plate having a length half that of the plate. ) The first mark and the second mark are in the vicinity of the support means. Two detecting means for detecting the mark of the master are arranged opposite to each other in the width direction of the master, and the plate making apparatus, the plate discharging apparatus, and the plate cylinder according to the feed amount of the master when the detecting means detects the mark. Control means to control each drive of A stencil printing apparatus characterized by the above. 2. The stencil printing apparatus according to claim 1, wherein, as the master roll, the master wound in a roll shape has a light-transmitting property that can be detected by a transmission-type detecting unit, and the mark is light-impermeable. A stencil printing apparatus characterized by the above . In the stencil printing apparatus according to claim 1 or 2 ,
When the control means first activates the stencil printing apparatus and the second mark is first detected by the detection means, and the feed amount of the master at that time is a length capable of feeding and discharging. The stencil printing apparatus is controlled so as to stop the conveyance of the master and cut the master by the cutting means before feeding and discharging the plate . In the stencil printing apparatus according to claim 1 or 2 ,
The stencil printing machine has a warning means for warning that there is no master remaining amount,
The control means, after starting the stencil printing apparatus, is the second mark first detected by the detection means, and when the feed amount of the master at that time is a length that cannot be fed, the master means The stencil printing apparatus is controlled to stop the conveyance of the ink and to warn that there is no remaining master amount by the warning means . In the stencil printing apparatus according to claim 1 or 2 ,
The control means, after starting the stencil printing apparatus, is the first mark first detected by the detection means, and when the feed amount of the master at that time is less than 1/2 plate, The stencil printing apparatus is controlled so that the second mark is conveyed until it is detected by the detecting means, and the master is cut by the cutting means and then the plate feeding and discharging are performed . In the stencil printing apparatus according to claim 5,
The stencil printing apparatus has a warning means for warning that there is no master remaining amount,
The control means is the first mark first detected by the detection means after starting the stencil printing apparatus, and when the master feed amount at that time is ½ plate or more, one plate After the length of the minute has been sent, the cutting means cuts the master for printing, and further conveys until the second mark is detected by the detecting means, according to the master feed amount at the time of detection. The stencil printing apparatus is controlled so as to warn the master remaining amount by the warning means or to cut and feed and discharge the plate by the cutting means.

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