JP2004216574A - Master roll and stencil printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply detect a remaining amount of a master and to decrease burden of a processing when no remaining amount exists in a stencil printing apparatus provided with a plate cylinder, a plate making device, a thermal head, a platen roller, a cutting means for cutting the master and a plate discharging device. <P>SOLUTION: Two detecting means S1 and S2 for detecting the first mark and the second mark provided on the master are arranged in the neighborhood of a supporting means 33 for supporting a master roll, and a controlling means for controlling each driving of the plate making device 4, the plate discharging device 5 and the plate cylinder 3 in accordance with an amount of delivery of the master is provided. The master roll 23 has the second mark on one side in the width direction of the master wound into a roll-like shape and close to the core part of the master, and the first mark on the other side in the width direction of the master at a position by 1/2 of the plate on the front side of the second mark. Here, when a plate with the maximum size that can be wound on the plate cylinder being an object for mounting the master is made to be one plate, the 1/2 plate means a plate with a 1/2 length of the one plate. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD 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 wound into a roll, and a stencil printing apparatus using the master roll.
[0002]
[Prior art]
2. Description of the Related Art A general stencil printing apparatus performs a printing operation using a supply of a master and ink. As the master used here, 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 obtained by winding a laminate structure obtained by laminating the above into a roll shape is mainly used.
[0003]
At the time of printing, heating perforating plate making is performed by a plate making device equipped with a thermal head based on the read information of the original image, and a predetermined size (including one plate including the clamped portion by the clamper) determined according to the size of the plate cylinder. Is cut by the cutting means. The master made in this manner is wound on the outer peripheral surface of a porous cylindrical plate cylinder such that the thermoplastic resin film surface faces outward.
[0004]
Printing paper is fed to the plate cylinder from a paper feeding device, and ink is supplied to the plate cylinder opening by ink supply means provided inside the plate cylinder, and the printing paper is pressed by a pressing member such as a press roller. In the process of being continuously pressed and fed to the plate-making master on the outer peripheral surface of the cylinder, the ink leached from the plate cylinder opening and the master perforation is transferred to the printing paper and printing is performed.
[0005]
The master roll is formed by winding a master around a cylindrical core, and is consumed with printing. At least one or more detected parts with different transmittances are provided at the rear end of the master roll in order to automatically detect when the remaining part of the master roll is consumed near the core and prompt replacement. ing.
On the other hand, the stencil printing apparatus is provided with a detecting means for detecting the provided end mark, and detects the detected portion. When the remaining amount of the master roll decreases, a warning is issued to the operator based on this detection, and the feeding of the document is stopped (for example, see Patent Document).
[0006]
The master wound on the master roll is cut into a predetermined size by a cutting unit, and is fed to a plate cylinder by a feed roller provided downstream of the cutting unit in the transport direction. The detection portion is provided immediately before the core of the master roll in order to use the master effectively.
[0007]
Since the remaining amount of the master up to the previous time is unknown, if there is a master that does not reach one plate but has a remaining amount close to one plate, the detected part of the master is detected by the detecting means, and the master is detected. When the end is warned, the downstream side of the master has been sent uncut to the downstream side of the cutting means by an amount corresponding to one plate, and the leading end side may have already reached the plate cylinder side. .
[0008]
In such a case, it is necessary to remove the master roll from the stencil printing machine, including the part that reaches the plate cylinder to the downstream side, but release the clamper of the plate cylinder or release the grip by the feed roller. This involves complicated work such as performing.
[0009]
On the other hand, as a conventional technique, there is a technique in which a reflection type sensor is used as a detecting means, and a master of a master roll forms a black band-shaped detecting portion at a position corresponding to one plate length from a core. In such a technique, as a means for ensuring accuracy due to the variation in sensitivity of the reflection type sensor used, a jig master simulates a state where there is no master for the target reflection type sensor and matches the output voltage thereof. The threshold was set.
[0010]
In such prior art, the master roll must be printed in advance by means of complicated printing in order to form a black belt-shaped detection portion, and an expensive reflection type sensor is used for the detection means. Moreover, since the setting and adjustment of the threshold value are necessary, the operation is complicated, and a backup RAM for storing the adjusted threshold value is required. It was also expensive.
[0011]
[Patent Document]
JP-A-9-229953
[0012]
[Problems to be solved by the invention]
An object of the present invention is to provide a master roll that can detect a master end by simple means and can be easily replaced, and a stencil printing apparatus using the master roll.
[0013]
[Means for Solving the Problems]
The present invention has the following configuration to achieve the above object.
(1). A second mark provided on one side in the master width direction, which is the rearmost portion near the core of the roll-wound master, and a position corresponding to a half plate on the front side of the second mark in the master width direction. The master roll had a first mark provided on the other side. However, a half plate is a plate having a half length when the maximum size plate that can be wound around the plate cylinder to which the master is to be mounted is one plate. 1).
(2). (1) In the master roll described in (1), the master has a light-transmitting property that can be detected by a transmission-type detecting means, and the mark is made light-opaque.
(3). A stencil printing machine in which at least a plate making device and a plate discharging device are arranged around a plate cylinder having a clamper for holding a master, wherein the plate making device supports a master roll from an upstream side in a master feeding direction. Supporting means, a thermal head for perforating and making a master drawn from a master roll supported by the supporting means, a platen roller for transporting the master while making contact with the thermal head, and a cutting means for cutting the master. And a feed roller for feeding the master toward the plate cylinder side is arranged in order, and the plate discharging device further includes a conveying unit that grips one end of the master wound on the plate cylinder and pulls out the master in the plate discharging direction. In the stencil printing machine described above, the support means can support the master roll described in (1) or (2). In the vicinity of the step, two detecting means for detecting the first mark and the second mark are arranged to face each other in the width direction of the master, and the feed amount of the master when the mark is detected by the detecting means. Accordingly, control means for controlling each drive of the plate making device, the plate discharging device, and the plate cylinder is provided (claim 3).
(4). (3) In the stencil printing apparatus according to (3), after the stencil printing apparatus has been activated, the control unit first detects the second mark by the detection unit, and supplies the feed amount of the master at that time. When the length is such that the plate and the plate can be discharged, control is performed such that the transport of the master is stopped, and the master is cut off by the cutting means before plate feeding and plate discharge are performed.
(5). (3) In the stencil printing apparatus described in (3), the stencil printing apparatus includes a warning unit that warns that there is no remaining master, and the control unit first detects the stencil printing device by the detection unit after starting up the stencil printing device. It is the second mark that has been performed, and when the feed amount of the master at that time is a length that cannot supply plate, the conveyance of the master is stopped, and the warning means warns that there is no remaining master. (Claim 5).
(6). (3) In the stencil printing apparatus according to (3), after the stencil printing apparatus is started, the first mark is first detected by the detecting means after the stencil printing apparatus is activated, and the feed amount of the master at that time is 1 If it is less than / 2 plates, it is controlled so that the second mark is further conveyed until it is detected by the detecting means, the master is cut by the cutting means, and then the plate is fed and discharged. Item 6).
(7). (6) In the stencil printing apparatus described in (6), the stencil printing apparatus includes a warning unit that warns that there is no remaining master, and the control unit first detects the stencil printing device by the detection unit after starting the stencil printing device. The first mark is the first mark. When the master feed amount at that time is equal to or more than 1/2 plate, the length of one plate is sent, and then the master is cut by the cutting means to perform printing. The second mark is further conveyed until the second mark is detected by the detection means, and the warning means warns the remaining amount of the master according to the feed amount of the master at the time of the detection, or is cut by the cutting means and supplied. The plate and the plate are controlled to be discharged (claim 7).
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
[1] Stencil printer
FIG. 1 shows the overall configuration of a stencil printing apparatus as an image forming apparatus having a paper feeding apparatus to which the present invention is applied. The stencil printing machine 1 has a structure of a well-known thermosensitive digital stencil making type integrated stencil printing machine. A plate making device 4 arranged on the right upper side of the plate cylinder 3 for making the master 2; a plate discharging device 5 arranged on the left upper side of the plate cylinder 3 for stripping and discharging the used master 2 from the plate cylinder 3; A sheet feeding device 8 arranged below the plate making device 4 for feeding printing paper 7 as a sheet-like medium stacked on the sheet feeding tray 6, and 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 toward the printing unit at a predetermined timing at which the printing paper 7 can meet the image of the master 2 wound on the plate cylinder 3 at the printing unit, and is disposed below the plate cylinder 3. The printing paper 7 that has been fed has been made on the plate cylinder 3 A printing device 10 for printing by pressing the master 2, a document reading device 12 positioned above the plate cylinder 3, the plate making device 4, and the plate discharging device 5 for reading an image of the document 11, and a stencil printing device 1. An air knife 13 and a paper discharge claw 14 for peeling the printed printing paper 7 printed by the printing pressure device 10 on the left side 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 loaded, and an operation panel (not shown) for operating the stencil printing apparatus 1 to perform printing. It is configured.
[0015]
The plate cylinder 3 has a well-known porous cylindrical shape and is rotatably supported around a drum shaft 17. The plate cylinder 3 can rotate the linear velocity variably by a main motor (not shown). An openable and closable clamper 18 for clamping the leading end of the master 2 is provided on one bus line 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 to the outer peripheral surface of the plate cylinder 3 is provided.
[0016]
The master 2 is made of a thermoplastic resin film made of polyester or the like and is bonded with Japanese paper or the like as a porous support. However, the master 2 is not limited to this and can be made of only a very thin thermoplastic resin film. It is also possible to use a different one.
[0017]
First, when the operator sets the 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 to start plate making, the plate discharging process is performed on the plate cylinder 3 in the same manner. Is executed. The plate cylinder 3 rotates in a 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 removed. Is discharged into the plate discharge box 20 of the plate discharge device 5 while being gradually peeled off and transported from the outer peripheral surface of the plate discharge device, thereby completing the plate discharge process.
[0018]
In parallel with the plate discharging process, the document reading unit 12 operates to read the document. The detailed configuration and operation related to the document reading are performed by, for example, a known “reduced document reading method”. The image obtained by reading the original fringes is finally photoelectrically converted by an image sensor including a photoelectric conversion element such as a CCD (charge coupled device). The electric signal subjected to the photoelectric conversion is transmitted to an analog / digital (A / D) conversion board (not shown) to be converted into a digital image signal.
[0019]
In parallel with the original reading operation, a plate making / plate feeding process is performed in the plate making device 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 of the master roll 23 and transported to the downstream side of the master transport path.
[0020]
With respect to the master 2 conveyed in this manner, a large number of minute heating elements arranged in a line in the main scanning direction of the thermal head 21 include the A / D conversion board and the subsequent plate-making control board (not shown). Then, various heat treatments are performed to selectively generate heat in accordance with the digital image signals sent, and the thermoplastic resin film of the master 2 that is in contact with the heat-generating heating element is melt-punched.
[0021]
In this way, the image information is written as a perforation pattern (image) by the position-selective fusion perforation of the master 2 according to the image information. The plate-making master 2 on which the image information is written and plate-formed is sent from the downstream side in the transport direction toward the outer peripheral side of the plate cylinder 3 by the rotation of the feed roller pair 24, and the plate in the plate feeding position shown in the figure. The body 3 moves toward the expanded clamper 18. At this time, the used master 2 has already been removed from the plate cylinder 3 by the plate discharging process. When the leading end, which is the end of the plate-making master 2 on the downstream side in the transport direction, 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 FIG. The master 2, which has been made, is gradually wound around the outer peripheral surface.
[0022]
After the completion of plate making, the rear end of the plate-making master 2 is cut to a predetermined length by the operation of the cutting means 25 provided in the plate making device 4, and the master 2 is completely wound around the outer peripheral surface of the plate cylinder 3. Then, the so-called plate feeding process ends.
[0023]
When the master 2 having been made in this way is wound around the outer peripheral surface of the plate cylinder 3, the plate making / plate feeding process is completed and the printing process is started. The paper feed tray 6 is lifted by well-known means (not shown) until the uppermost printing paper 7 stacked on the paper feed tray 6 contacts the call roller 26. The top printing paper 7 in contact with the call roller 26 is conveyed by the rotation of the call roller 26, and only one sheet of print paper 7 is separated by the pair of separation rollers 27 to form a pair of registration rollers 9. Sent toward
[0024]
At this time, even after the leading end of the fed printing paper 7 comes into contact with the portion just 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 is in a sheet shape indicated by an arrow c. The central portion in the medium transport direction, that is, the portion between the registration roller 9 and the separation roller 27 is stopped in a state where it is bent upward.
[0025]
When the printing operation is started, the plate cylinder 3 starts rotating at a rotation 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. The rotation of the doctor roller 28 and the doctor roller 29 causes the mixture to be kneaded and elongated, and also to uniformly adhere to the outer peripheral surface of the ink roller 28.
[0026]
The remaining amount of ink is detected by a known ink detecting means, for example, as shown in FIG. 2 of JP-A-5-229243, and when the amount of ink is low, ink is supplied from the ink supply distributor. In this way, ink is supplied to the inner peripheral side of the plate cylinder 3 by the ink roller 28 which rotates in contact with the inner peripheral surface while rotating in the same direction as the rotational direction of the plate cylinder 3 and in synchronization with the rotational speed of the plate cylinder 3. You.
[0027]
The printing pressure device 10 mainly includes 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 at a predetermined timing by the registration roller 9 against the plate cylinder 3 to form a print image on the printing paper 7.
[0028]
The press roller 31 is rotatably supported at one swinging end of the press roller bracket, and is provided on the outer peripheral surface of the plate cylinder 3 by a well-known mechanism including a press roller tension and a press roller cam so as to be able to freely contact and separate. I have.
[0029]
When the printing paper 7 is fed between the printing drum 3 and the press roller 31 at a predetermined timing synchronized with the rotation of the printing drum 3 by the registration roller 9, that is, to the printing unit 32 as an image forming unit, The press roller 31 which has been separated below the outer peripheral surface of the plate cylinder 3 is oscillated synchronously with the press roller 31, and is pressed against the master 2, which has been wound around the outer peripheral surface of the plate cylinder 3.
[0030]
Thereby, the master 2 having made the plate is brought into close contact with the outer peripheral surface of the plate cylinder 3 due to the adhesive force due to the viscosity of the ink oozing out from the porous portion of the plate cylinder 3, and at the same time, the ink is further removed from the perforated pattern portion of the master 2 which has made the plate Exudes, and the exuded ink is transferred to the surface of the printing paper 7 to form a desired print image.
[0031]
When the leading end of the printing paper 7 on which the print image is formed reaches a position near the paper discharge unit 15, the print paper 7 is separated and separated from the plate cylinder 3 by the air knife 13 and the paper discharge claw 14. The printed printing paper 7 that has been separated and peeled is conveyed in the direction indicated by the arrow b by the paper discharge unit 15 and flies toward the paper discharge table 16. Thus, the so-called “printing” or “test printing” is completed.
[0032]
Next, the number of prints and the printing speed are set using a numeric keypad (not shown) on the operation panel, and when the start key is pressed again, the printing speed set in each of the paper feeding, printing, and discharging processes is the same as the above-described trial printing. Are repeated for the number of prints, and all the steps of stencil printing are completed.
[0033]
[2] Details of plate making device and plate discharging device (related to claim 3)
The detailed configuration of the stencil printing apparatus and the stencil discharging apparatus closely related to the present invention among the stencil printing apparatuses shown in FIG. 1 will be described with reference to FIG. The plate making device 4 supports a master roll 23 in which the master 2 is wound in a roll shape around a core 23a from the upstream side in the feed direction of the master 2 in the feed direction indicated by the arrow d, and rotatably supports the master roll 23 with the core 23a. A supporting means 33 for providing a driving force; a thermal head 21 for perforating and making a master 2 drawn from a master roll 23 supported by the supporting means 33; and a platen roller 22 for transporting the master 2 while making contact with the thermal head 21 And 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, the drive source for driving the cutting means 25 is a motor M1. A drive source for driving the feed roller pair 24 and a drive source for driving the platen roller 22 are common, and the common drive source is a motor M2 here. The feed roller pair 24 and the platen roller 22 are connected by an intermediate gear, and are synchronously rotated by a motor M1, which is a common drive source. Note that the support means 33 is also provided with a motor as a drive source for applying a rotational driving force to the core 23a. Since this motor is also driven in synchronization with the motor M1, the motor M2 is included in the operation of the motor M2 in order to avoid complication of description, and will not be particularly described. The plate cylinder 3 is driven by a motor M3 that can rotate forward and backward.
With respect to the plate discharging device 5, the used master is held between the pair of upper and lower belts 35 and 36 and sent out to the plate discharging box 20 (see FIG. 1). The lower belt 36 of the pair of upper and lower belts 35 and 36 holds the rear end of the master from a position separated from the plate cylinder 3 while the driving roller 34 r supporting the belt 36 rotates. This involves a lateral movement operation to move to a position where it can be performed. Here, for simplicity of description, it is assumed that the motor M4 performs both the rotation driving of the belt and the lateral movement operation. The pair of upper and lower belts 35 and 36 constitutes a conveying unit that holds one end of the master 2 wound around the plate cylinder 3 and pulls out in the plate discharge direction indicated by an arrow e.
[0035]
The type of the support means 33 is not limited, but rotatably supports the core 23a of the master 2 wound in a roll shape as described above. In the vicinity of the support means 33, on the transport path where the master 2 goes to the nip portion between the platen roller 22 and the thermal head 21, the detecting means S1 and S2 face each other in the width direction of the master 2. Position, that is, opposed to the width direction of the master. These detecting means S1 and S2 will be described later.
[0036]
[3] Master (related to claims 1 and 2)
The 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 rear portion (portion close to the core portion) where the remaining portion is used up to the portion close to the core portion 23a and the remaining portion is small is virtually drawn out.
[0037]
A second mark (hereinafter also referred to as a black seal B2) on one side in the master width direction (axial direction of the core 23a), which is the rearmost portion near the core 23a of the master 2 wound in a roll shape, and the black seal It has a first mark (hereinafter also referred to as a black seal B1) provided on the other side in the master width direction at a position corresponding to a half plate on the front side (arrow d direction side) of B2. However, here, the half plate is a plate having a half length 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 a 1/2 version.
[0038]
The first mark and the second mark only need to be marks that can be detected by the detection units S1 and S2. In this example, since the transmission type sensors that detect light are used as the detection units S1 and S2, the master 2 has a light transmittance that can be detected by the detection units S1 and S2, and the first mark and the second mark Two marks were made light opaque. In practice, a very simple means of attaching a black seal is sufficient. Here, the case where a sticker is attached is exemplified, and the black stickers are referred to as B1 and B2.
[0039]
[4] Relationship between black seal and detection means
As shown in FIG. 4, the detecting means S1 and the detecting means S2 are arranged to face each other in the width direction of the master 2, and are fixed to a stationary member. For example, the detecting unit S1 faces the U-shaped light-emitting unit and the light-receiving unit so that the light-receiving unit is vertically located and the widthwise end of the master 2 is interposed therebetween. Therefore, in the process of transporting the master 2, when the black sticker B1 passes through the detecting means S1, the light from the light emitting unit is no longer detected by the light receiving unit, so that the signal output changes, thereby changing the black color. The seal B1 can be detected. Similarly, the detection means S2 can detect the black seal B2.
[0040]
[5] Control means (related to claim 3)
Control means for controlling each drive of the plate making device 4, the plate discharging device 5, and the plate cylinder 3 according to the feed amount of the master 2 when the marks (black seal B1, black seal B2) are detected by the detecting means S1, S2 will be described. I do.
[0041]
In FIG. 5, the control means 40 is constituted mainly by a CPU (central processing unit). The output of the detection means S1 and S2 is input to the control means 40. The control means 40 performs arithmetic processing based on the inputs from the detection means S1 and S2, and outputs to the motors M1 to M4 and the error display section 41 for driving them. The error display unit 41 is an example of a warning unit that warns that there is no remaining master, and is configured as an electrical or mechanical unit that appeals to the senses of the operator, such as turning on a lamp or sounding a buzzer.
[0042]
[6] Content of control such as detection of the rear end of the master roll by the control means (related to claims 4 to 7) The master roll 23 controls the control means 40 in the plate cylinder 3, the plate making device 4, and the plate discharging device 5 of the stencil printing apparatus 1. Used and exchanged by control such as detection of the rear end. 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 a counter built in the control means). It can be known by detecting the number of rotations of the motor or the number of rotations of the shaft of the platen roller 22 by the control means 40. "X" is the length of the master transport path from the position of the cutting means 25 to the holding position by the clamper 18 when the plate cylinder 3 is at the rotational position for receiving the master in the stencil printing apparatus. If the master can be fed by the length of "X", cutting can be performed at that position, and even if it is a length that cannot be printed, plate feeding can be performed. Therefore, automatic plate feeding and plate discharging can be performed.
[0043]
In the stencil printing machine 1, a master roll is mounted on the support means 33. After the printing is completed, the power is turned off, and it is unknown how much of the master remains. Under such a premise, control contents such as detection of the trailing end of the master roll by the control means will be described.
[0044]
6.1 Control pattern 1
In FIG. 6, the operation is started by turning on the main power supply of the stencil printing apparatus 1. At step P1, it is checked whether 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 detecting means S1 is on, the sheet can be fed until the detecting means S2 is further turned on, but the possible master feed amount is a half plate between the black seals B1, B2 (first mark, second mark). Only length. If the detection 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 section 41 displays the absence of the master by 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.
[0045]
6.2 Control pattern 2
In FIG. 6, when the detection means S1 or S2 is not turned on in step P1, the master remaining amount is at least 版 or more. Proceeding to step P3, it is checked whether it is in the plate making mode. If the mode is not the plate making mode, the process returns. If the mode is the plate making mode, preparations for starting the transfer 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 conveyed. 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. Stops transport, clears the count, and exits to return.
[0048]
FIG. 8 illustrates a state of the master 2 in the present control pattern 2. In FIG. 8, [SP] is a set position where the core portion 23a is set on the support means 33, [CP] is a cut position by the cutting means, and a hatched portion indicates "Start". ”Corresponds to the feed amount A conveyed by performing the procedure from the time (the same display is shown in FIGS. 9 to 14 to be described later).
[0049]
In this example, the feed amount is up to step P7. The portion shown by a virtual line in FIG. 8 illustrates a case where the master roll is unwound from the position of the support means 33 as a starting point, and the black stickers B1 and B2 (first mark and second mark) of the master are This indicates that there is still enough room before the detection by the detection means.
[0050]
6.3 Control pattern 3 (Claim 4)
In FIG. 6, the master feed amount is conveyed while being counted up in step P6, and the detection of the black seal S1 (first mark) by the detection means S1 is not performed in step P7. If the seal B2 (second mark) is detected, the process proceeds to Step P11, where A ≧ X? Is checked. If A ≧ X, the feed amount A up to that time is equal to or exceeds X, so that automatic plate feeding and discharging can be performed.
[0051]
Therefore, in step P12, the motor for master feeding is turned off, the conveyance of the master is stopped, the counter value thus far is cleared, and the master is cut by the cutting means. Is performed, and the motor M4 is driven in step P14 to automatically perform plate feeding and plate discharging operations.
[0052]
Since the master supported by the support means 33 has no remaining, the error display unit 41 displays a lamp indicating 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 a state of the master 2 in the present control pattern 3. In FIG. 9, the hatched portion corresponds to the feed amount A conveyed by performing this procedure from “start”. In this example, the feed amount is up to step P8. The master remaining on the plate making device 4 after cutting the master in Step P12 is a portion excluding the hatched portion in FIG.
[0054]
6.4 Control pattern 4 (related to claim 5)
In the control pattern 3, "A≥X?" Is checked in step P11, and the case where "A≥X" is described has been described. In this example, this corresponds to a case where “A ≧ X” is not satisfied, and since “A <X”, the master has only a remaining amount that cannot be automatically fed. 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 point is cleared, and the master is not cut off and the error display unit 41 displays no 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 a state of the master 2 in the present control pattern 4. In FIG. 10, the hatched portion corresponds to the feed amount A conveyed 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 device 4 is removed from the plate making device 4 including the hatched portion.
[0056]
6.5 Control pattern 5 (related to claim 6)
In FIG. 6, when the master feed amount is conveyed while being counted up in step P6, and the detection of the black sticker S1 (first mark) by the detecting means S1 in step P7, the process proceeds to step P18 in FIG. A≥1 / 2 version? "Is checked. Unless “A ≧ 1/2 plate?”, It means “A <1/2 plate”, which is not enough for one plate, so the process proceeds to step P19 and the detecting means S2 sets the black seal B2 (second Mark) is detected and turned on. When the detecting means S2 is turned on, the motor for master feeding is turned off in step P20, the master conveyance is stopped, the counter value up to that point is cleared, and the cutting means is turned off. Then, the process proceeds to step P21 to perform a winding operation of winding the master around the plate cylinder 3. In step P22, the motor M4 is driven to automatically perform 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 section 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.
[0058]
FIG. 11 illustrates a state of the master 2 in the present control pattern 5. In FIG. 11, a hatched portion corresponds to the feed amount A conveyed by executing 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 the master cutting in Step P20 is the portion excluding the hatched portion in FIG.
[0059]
6.6 Control pattern 6 (related to claim 7)
The case where the control pattern 5 is not “A ≧ 1/2 version?” In step P18 of FIG. 7 has been described. In the present example, this corresponds to the case where “A ≧ 1/2 plate”, and when the first detecting unit S1 detects the black seal B1, the feed amount of the master 2 is １ ／ plate or more. When the length of the half plate between the seal B1 and the black seal B2 is included, at least one plate should be able to be fed.
[0060]
The state of the master 2 in the control pattern 4 is illustrated. In FIG. 12, the hatched portion corresponds to the feed amount A conveyed by executing 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 more. FIG. 13 shows an example of a state in which this one plate has been sent. The amount sent for one plate is indicated by hatching in FIG.
[0062]
In this way, one plate is fed in step P24, the motor for master feeding is turned off in step P25, the conveyance of the master is stopped, the counter value thus far is cleared, and the master is cut by the cutting means. Proceeding to P26, a winding operation of winding the 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 the printing, the master feeding is started again in step P28, and the detecting means S2 detects the black sticker B2 (second mark) and conveys it until it is turned on. At the time of resuming the feeding of the master, the feeding of the master is started from a state where there is no hatched portion in FIG.
[0064]
The process after step P28, that is, the process from step P11 ′ to step P17 ′ is the same as the process from step P11 to step P17 in FIG. 6 described above. Therefore, “′” is added to the corresponding step code.
[0065]
When the black sticker B2 (second mark) is detected by the detecting means S2 in Step P28, the process proceeds to Step P11 ′, where A ≧ X? Is checked. If A ≧ X, the feed amount A up to that time is equal to or exceeds X, so that automatic plate feeding and discharging can be performed.
[0066]
Therefore, in Step P12 ', the motor for master feeding is turned off, the conveyance of the master is stopped, the counter value thus far 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 drum 3 is performed, and in step P14 ', the motor M4 is driven to automatically perform plate feeding and plate discharging operations.
[0067]
Since there is no remaining master supported by the support means 33, the absence of the master is indicated by a lamp on the error display section 41 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 ′, “A <X” is satisfied, and 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 point is cleared, and the master is not disconnected, and the error display unit 41 displays in step P17'. Lamp display 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.
[0069]
【The invention's effect】
According to the first aspect of the present invention, by setting the mark interval to 版, the simple arrangement arranged in the width direction of the master allows the arrangement detecting means to detect the remaining portion of the master to less than one edition and use it effectively. Can be.
[0070]
According to the second aspect of the present invention, the mark can be easily attached, for example, by sticking a light-impermeable seal without using complicated printing means. Further, a light transmission type sensor can be used as the detection means instead of the reflection type which has conventionally had a problem.
[0071]
According to the third aspect of the present invention, it is possible to provide a stencil printing apparatus in which the trailing edge detection of the master and the subsequent processing are simple.
[0072]
According to the fourth aspect of the present invention, the remaining portion of the master can be prevented from remaining on the master transport path by automatic plate feeding and plate discharging.
[0073]
According to the invention described in claim 5, the operator can accurately know that there is no remaining master by the warning means.
[0074]
According to the sixth aspect of the present invention, even when the master remaining amount is less than one plate, the burden on the operator can be reduced by automatic plate feeding and plate discharging.
[0075]
According to the seventh aspect of the present invention, the master can be used up as much as possible, and it can be accurately known by the warning means 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 between a master, a mark, and a detection unit.
FIG. 5 is a block diagram illustrating a control unit.
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 section of a master.
FIG. 10 is a diagram illustrating a remaining amount section of a master.
FIG. 11 is a diagram illustrating a remaining amount section of a master.
FIG. 12 is a diagram illustrating a remaining amount section 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 2nd mark

Claims (7)

A second mark provided on one side in the master width direction, which is the rearmost portion near the core of the roll-wound master, and a position corresponding to a half plate on the front side of the second mark in the master width direction. A master roll having a first mark provided on another side.
However, the half-version is a half-length plate when the maximum-size plate that can be wound on the plate cylinder to which the master is to be mounted is one. 2. The master roll according to claim 1, wherein the master 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 in which at least a plate making device and a plate discharging device are arranged around a plate cylinder having a clamper for holding a master,
The plate making device includes a support unit that supports a master roll from an upstream side in a feeding direction of a master, a thermal head that perforates and makes a master drawn from the master roll supported by the support unit, A platen roller for conveying while contacting the thermal head, a cutting means for cutting the master, and a feed roller for feeding the master toward the plate cylinder side are arranged in this order, and the plate discharging device winds around the plate cylinder. A stencil printing machine comprising a conveying means for holding one end of the mounted master and pulling out the master in a plate discharging direction;
The support means is capable of supporting the master roll according to claim 1 or 2, and two detection means for detecting the first mark and the second mark are provided near the support means. A control unit that is arranged to oppose the master in the width direction and controls each drive of the plate making device, the plate discharging device, and the plate cylinder according to a feed amount of the master when the detection unit detects the mark. A stencil printing apparatus characterized in that: The stencil printing machine according to claim 3,
When the control unit starts the stencil printing apparatus, the first mark detected by the detection unit is the second mark, and the master feed amount at that time is a length capable of feeding and discharging the stencil. A stencil printing machine which stops feeding of the master, cuts the master by the cutting means, and then performs plate feeding and plate discharging. The stencil printing machine according to claim 3,
The stencil printing apparatus includes a warning unit that warns that there is no remaining master,
The control means, after starting up the stencil printing apparatus, the first mark detected by the detection means is the second mark, and when the feed amount of the master at that time is a length that cannot supply the stencil, the master The stencil printing apparatus is controlled to stop the conveyance of the stencil and to warn the user that there is no remaining master by the warning unit. The stencil printing machine according to claim 3,
The control means is the first mark that is first detected by the detection means after the stencil printing apparatus is activated, and when the master feed amount at that time is less than 1/2 plate, A stencil printing apparatus, wherein the stencil printing apparatus is controlled so that the second mark is conveyed until it is detected by the detection means, the master is cut by the cutting means, and then the stencil feeding and discharge are performed. The stencil printing apparatus according to claim 6,
The stencil printing apparatus includes a warning unit that warns that there is no remaining master,
After the stencil printing apparatus is started, the control means detects the first mark first by the detection means, and when the master feed amount at that time is １ ／ or more, the first mark is used. After sending the length of the minute, the cutting means cuts the master and supplies it for printing, and further conveys the second mark until it is detected by the detecting means, according to the feed amount of the master at the time of the detection. A stencil printing apparatus, wherein the stencil printing apparatus controls to warn the master remaining amount by the warning means or to cut and supply the stencil by the cutting means.

Images