JP2006334954A - Stencil printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printing device which can successfully perform a stencil supply operation according to the kind of a master. <P>SOLUTION: This stencil printing device 1 has a manufactured master conveying means 3, a master stocking means 29 for stocking a manufactured and conveyed master 31 manufactured and conveyed, and a master class distinguishing means 41. The master stocking means 29 has a main body 35 for stocking the manufactured and conveyed master 31 and a plurality of fans 37a, 37b, 37c, 38a and 38b which are actuated to introduce the manufactured and conveyed master 31 into the main body 35. In addition, a control means 62 is installed which controls the operation of the fans 37a, 37b, 37c, 38a and 38b correspondingly with the kind of the master 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stencil printing apparatus that winds and prints a master that has been made, and more particularly to a stencil printing apparatus that includes master stock means for stocking the master that has been made.

  Conventionally, digital thermal stencil printing is known as a simple printing method. This is because a thermal head having a plurality of fine heating elements is brought into contact with a master obtained by bonding a thermoplastic resin film and a porous support, and the master is placed on a platen roller or the like while energizing the heating elements in a pulsed manner. After the perforated image based on the image information is hot-melt perforated and engraved on the thermoplastic resin film of the master by conveying with a conveying means, this perforated master is wound around a porous cylindrical plate cylinder and pressed. By pressing the paper against the outer peripheral surface of the plate cylinder by means, the ink oozed from the opening portion of the plate cylinder and the perforation portion of the master is transferred to the paper, and a printed image is obtained on the paper.

  As the stencil printing apparatus used for this stencil printing, at present, an integrated apparatus that automatically and continuously performs each operation such as a plate discharging operation, an image reading operation, a plate making operation, a plate feeding operation, and a printing operation is mainstream. In this integrated stencil printing apparatus, when a start key is pressed after an original is set in the image reading unit, a printing operation is performed after a plate discharging operation, an image reading operation, a plate making operation, and a plate feeding operation are performed. However, in the normal stencil printing apparatus, even if the image reading operation is completed, the plate making operation is not performed until the plate discharging operation is completed. There is a problem that the first print time, which is the time until the printed material is obtained, becomes long.

  Therefore, there is a technology that improves the work efficiency by shortening the first print time by providing master stock means in the plate making section to store the plate-made master, performing the plate making operation in parallel with the plate discharging operation or during the printing operation, For example, it is disclosed in “Patent Document 1”.

  Further, in “Patent Document 2”, in a configuration in which master stock means having a folding storage portion that folds the master into a plurality of stages is provided in the plate making portion, and a suction fan is disposed at the innermost portion, only the suction force of the suction fan is used. In order to solve the problem that the master-making means cannot be stored well in the master stock means and the master transport jam occurs, the swell prevention prevents the master from rising near the master entrance of the master stock means. Techniques for providing means are disclosed.

JP 2002-103565 A JP 2003-118221 A

  In the stencil printing apparatus described above, when a plurality of types of masters having different rigidity are used, setting the operation of the fan of the master stock means in accordance with the master having low rigidity is excessive for the master having high rigidity. The fan is driven and wasteful energy is consumed. On the other hand, if the operation of the fan is set in accordance with a master with high rigidity, the master with low rigidity becomes insufficient in force and a problem such as plate feeding jam occurs.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a stencil printing apparatus that solves the above-described problems and can perform a good plate feeding operation corresponding to the type of master.

  The invention according to claim 1 is a stencil having plate making and conveying means for making a master by plate making, master stock means for storing the master made by plate making and conveying by the plate making and conveying means, and master type determining means for determining the type of master. In the printing apparatus, the master stock means has a main body that stores the master that has been transported by plate making, and a plurality of fans that operate to introduce the master that has been transported by plate making into the main body, depending on the type of the master And control means for controlling the operation of each fan.

  According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the control unit further controls the operation and non-operation of each fan for each fan.

  According to a third aspect of the present invention, in the stencil printing apparatus according to the second aspect, the control means further increases the number of operating each of the fans as the rigidity of the master increases.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first aspect, the control means further controls an air volume of each fan.

  According to a fifth aspect of the present invention, in the stencil printing apparatus according to the fourth aspect, the control means further increases the air volume of each fan as the rigidity of the master increases.

  A sixth aspect of the present invention is the stencil printing apparatus according to any one of the first to fifth aspects, further comprising temperature detecting means for detecting an environmental temperature, wherein the control means is configured to detect the environmental temperature according to the environmental temperature. The operation of each fan is controlled.

  According to a seventh aspect of the present invention, in the stencil printing apparatus according to the sixth aspect, the control means further drives all the fans at a maximum air volume when the environmental temperature is out of a preset range. Features.

  The invention according to claim 8 is the stencil printing apparatus according to any one of claims 1 to 7, further comprising a plate-making conveyance unit that includes at least the plate-making conveyance means and is detachable from the printing apparatus main body, The master type discriminating unit discriminates the type of the master when the plate-making conveyance unit is attached to the printing apparatus main body.

  According to a ninth aspect of the present invention, in the stencil printing apparatus according to any one of the first to seventh aspects, the master type determining means determines the type of the master when the main power is turned on. Features.

  A tenth aspect of the present invention is the stencil printing apparatus according to any one of the first to ninth aspects, wherein the main body further includes a plurality of folding storage portions that fold the master transported in a plurality of stages. And

  According to the present invention, the control means determines the master type based on the detection result by the master type determination means, and the control means operates and inactivates each fan based on the rigidity according to the determined master type, In addition, since the air volume is controlled, it is possible to perform a good plate feeding operation without increasing the cost by controlling each fan in accordance with the rigidity of the master.

  Further, the control means determines the environmental temperature based on the detection result by the temperature detection means, and the control means controls the air volume of each fan based on the determined environmental temperature. It is possible to prevent the occurrence of a plate-feed jam due to sticking of the master due to moisture in a high-temperature and high-humidity environment, and perform a good plate-feeding operation.

  FIG. 1 is a schematic front view of a stencil printing apparatus that employs an embodiment of the present invention. In FIG. 1, a stencil printing apparatus 1 includes a printing unit 2, a plate making and conveying unit 3, a paper feeding unit 4, a plate discharging unit 5, a paper discharging unit 6, an image reading unit 7, and the like.

  The printing unit 2 is provided at a substantially central portion of the apparatus main body 8 which is the main body of the printing apparatus and is driven to rotate by a plate cylinder driving means (not shown), and can be brought into contact with and separated from the outer peripheral surface of the plate cylinder 9. And an impression cylinder 10 that presses the sheet P fed from the sheet feeding unit 4 against the plate cylinder 9.

  The plate cylinder 9 includes a porous support plate having both side edges attached to each peripheral surface of a pair of flanges (not shown), and a mesh screen wound around the outer periphery of the porous support plate. The porous support plate is provided with an opening portion having a plurality of openings and a non-opening portion. A freely openable / closable clamper 11 is disposed in the non-opening portion, and the clamper 11 is opened and closed by an opening / closing means (not shown) when the plate cylinder 9 occupies a predetermined position.

  An ink supply means 12 is disposed inside the plate cylinder 9. The ink supply means 12 is mainly composed of an ink supply pipe 13 that also serves as a support shaft of the plate cylinder 9, an ink roller 14, a doctor roller 15, and the like.

  The ink supply pipe 13 is disposed between a pair of flanges (not shown), and each flange is rotatably supported via a bearing (not shown). An ink pump and an ink pack (not shown) are respectively connected to the ink supply pipe 13, and the ink in the ink pack is moved into the plate cylinder 9 from the ink supply holes provided in the ink supply pipe 13 by the operation of the ink pump. Supplied.

  The ink roller 14 is arranged between a pair of flanges (not shown) and is rotatably supported between a pair of side plates (not shown) fixed to the ink supply pipe 13. Synchronously, it is rotated in the clockwise direction in FIG. The ink roller 14 is disposed at a position where a slight gap is generated between the peripheral surface thereof and the inner peripheral surface of the plate cylinder 9.

  A doctor roller 15 is disposed in the vicinity of the ink roller 14. The doctor roller 15 is also rotatably supported between the same side plates (not shown) as the ink roller 14, and is rotated in the reverse direction in synchronization with the ink roller 14 by a rotation driving means (not shown). The doctor roller 15 is disposed at a position where a slight gap is generated between the peripheral surface of the doctor roller 15 and the peripheral surface of the ink roller 14.

  A space having a wedge-shaped cross section is formed in the vicinity of the ink roller 14 and the doctor roller 15, and the ink reservoir 16 is formed by storing the ink supplied from the ink supply pipe 13 in this space. The ink in the ink reservoir 16 is supplied as a thin film to the peripheral surface of the ink roller 14 when passing through the vicinity of the ink roller 14 and the doctor roller 15, and when the plate cylinder 9 is pressed by the impression cylinder 10 described later. Further, when the peripheral surface of the ink roller 14 and the inner peripheral surface of the plate cylinder 9 are in contact with each other, the ink is supplied to the inner peripheral surface of the plate cylinder 9.

  An impression cylinder 10 is disposed below the plate cylinder 9. The impression cylinder 10 is rotatably supported by a pair of arm members (not shown) of the impression cylinder 10, and is configured to be able to contact with and separate from the outer peripheral surface of the plate cylinder 9 by swinging each arm member. On the outer peripheral surface of the impression cylinder 10, a recess 18 for avoiding interference with the clamper 11 and an openable / closable gripper 19 for holding the paper P on the outer peripheral surface of the impression cylinder 10 are disposed. The claw 19 is opened and closed by a cam (not shown) provided in the apparatus main body 8.

  A plate-making transport unit 3 is disposed on the upper right side of the printing unit 2. The plate-making transport unit 3 includes a master storage unit 20, a master set roller 21, a platen roller 22, a thermal head 23, a platen pressure release mechanism 24, a tension roller pair 25, a static elimination roller 26, a master cutting unit 27, a reverse roller pair 28, and a master. It has a stock means 29, a plate supply guide plate 30 and the like, and is configured to be detachable from the apparatus main body 8 as a plate-making transport unit.

  The master storage means 20 is disposed between side plates (not shown) of the plate-making transport unit main body 3a constituting the unit main body of the plate-making transport unit 3, and is a master 31 formed by bonding a thermoplastic resin film and a porous support. The core part of the master roll 31a formed by winding the roll in a roll shape is supported rotatably and detachably.

  The master set roller 21 is rotatably disposed between side plates (not shown) of the plate-making transport unit body 3a, and a rotational driving force from a stepping motor 32 (described later) is transmitted via driving force transmission means such as a gear or a belt (not shown). Are transmitted in the same direction in synchronization with the platen roller 22.

  The platen roller 22 is rotatably supported between side plates (not shown) of the plate-making transport unit main body 3a, and is rotated by a stepping motor 32. The thermal head 23 has a plurality of heat generating elements. The surface of the heat generating elements is brought into contact with the peripheral surface of the platen roller 22, and the thermoplastic resin film surface of the master 31 is overheated and melt perforated. The platen pressure release mechanism 24 that supports the thermal head 23 brings the thermal head 23 into contact with and away from the peripheral surface of the platen roller 22. Details of the platen pressure release mechanism are disclosed in, for example, Japanese Patent Laid-Open No. 10-157052. The platen roller 22 and the thermal head 23 constitute a plate-making conveyance means 33 for plate-making conveyance of the master 31.

  The tension roller pair 25 has an upper roller composed of a driving roller and a lower roller composed of a driven roller, which are rotatably supported between side plates (not shown) of the plate-making transport unit body 3a. It has a function of applying a predetermined tension to the master 31 reaching the pair 25. The tension roller pair 25 transmits the rotational driving force from the stepping motor 32 to the upper roller via a driving force transmitting means such as a gear or a belt (not shown), so that the upper roller is synchronized with the platen roller 22 as shown in FIG. Is driven to rotate in the direction indicated by the arrow. The lower roller is incorporated in the platen pressure release mechanism 24, and selectively occupies a pressing position where the upper roller is pressed with a predetermined pressing force and a spaced position where the lower roller is separated from the upper roller.

  The neutralizing roller 26 is rotatably supported between side plates (not shown) of the plate-making conveyance unit main body 3a, and is made of, for example, conductive acrylic resin and copper sulfide, and abuts on the upper surface 27b of the frame 27a of the master cutting means 27. Are arranged. The static elimination roller 26 is configured to release static electricity charged on the master 31 from a metal frame 27a having conductivity. The static elimination roller 26 is rotationally driven in the same direction in synchronization with the platen roller 22 by transmitting the rotational driving force from the stepping motor 32 via a driving force transmission means such as a gear or a belt (not shown).

  The master cutting means 27 has the same configuration as that disclosed in Japanese Patent Application Laid-Open No. 2000-6510, and includes a frame 27a, a feed screw mechanism 27c, a slider 27d, and the like. The master 31 is cut by reciprocating in the master width direction which is the width direction of 31.

  The reversing roller pair 28 has an upper roller made up of a driving roller and a lower roller made up of a driven roller, which are rotatably supported between side plates (not shown) of the plate-making transport unit body 3a, and are stored in the master stock means 29. In addition, it has a function of feeding the master 31 that has already been made to the clamper 11. The reverse roller pair 28 transmits the rotational driving force from the stepping motor 34 to the upper roller via a driving force transmission means such as a gear or a belt (not shown), so that the upper roller and the lower roller pressed against the upper roller are illustrated. 2 are each driven to rotate in the direction indicated by the arrow. The upper roller is provided with a one-way clutch (not shown) so that when the upper roller is rotated by an external force, the rotational force is not transmitted to the driving force transmitting means.

  As shown in FIGS. 1 to 3, the master stock means 29 includes a bending box 35, a movable guide plate 36, and a movable guide plate 36 as a three-stage folded type main body having three folded storage portions 35a, 35b, and 35c. A solenoid (not shown) to be moved, suction fans 37a, 37b, 37c, blower fans 38a, 38b, and the like are provided.

  The bending box 35 has a function of storing while forming the bending 31b in the master 31 that has been subjected to plate making. The bending box 35 is integrally formed with two turn-back plates 35d, 35e for turning the master 31 that has been made of plate-making in a plurality of stages (three stages in this embodiment). 35a, 35b, and 35c are formed. A lid 39 that can be freely opened and closed is provided at the bottom of the bending box 35. The lid 39 opens and closes when removing the pre-made master 31 remaining in the bending box 35 or cleaning the inside of the bending box 35. Is done.

  The movable guide plate 36 is rotated by a solenoid (not shown), and a guide conveyance position that forms a conveyance path for the master 31 as shown in FIG. 1, and a bending formation position that opens the conveyance path for the master 31 as shown in FIG. Selectively occupy. When the movable guide plate 36 occupies the deflection forming position, the upper side of the deflection box 35 is opened, and an opening 35 f for introducing the master 31 into the deflection box 35 is formed.

  Suction fans 37a, 37b, and 37c that have suction ports and exhaust ports (not shown) and that have built-in drive motors are disposed on the back side wall surface of the folded storage portion 35c located at the innermost portion of the bending box 35. By the operation of the suction fans 37a, 37b, and 37c, an air flow that flows from the left to the right in FIG. . Each suction fan 37a, 37b, 37c is controlled by the control means 62 which mentions the operation | movement and non-operation | movement, and an operation | movement aspect later.

  Blowing fans 38a and 38b of the same type as the suction fans 37a, 37b, and 37c are disposed in a portion located above the opening 35f of the bending box 35. The operation of each of the blower fans 38a and 38b generates an air flow that feeds the master 31 into the bending box 35 from the opening 35f, which promotes the formation of the bending 31b and is disclosed in Japanese Patent Laid-Open No. 2003-118221. As a result, it is possible to prevent the jamming of the master 31 due to the rising of the master 31. Each blowing fan 38a, 38b is controlled by the control means 62 which mentions the action | operation and non-operation and an operation | movement aspect later.

  The pair of plate supply guide plates 30 is disposed on the downstream side of the reverse roller pair 28 in the master conveyance direction, and is configured integrally with the plate-making conveyance unit main body 3a. Each plate-feeding guide plate 30 guides the master 31 that has been subjected to plate making and is conveyed by the pair of reversing rollers 28 so that the tip thereof is directed obliquely downward to the left. The front end of the master 30 that has been made by the plate guide guided by each plate supply guide plate 30 is released when the plate cylinder 9 is stopped at a predetermined plate supply position and the clamper 11 is opened, in the plate supply standby state of the stencil printing apparatus 1. Sent to the clamper 11 made.

  In FIG. 2, reference numeral 40 denotes a master end sensor, reference numeral 41 denotes a master set sensor, reference numeral 42 denotes a master tip detection sensor, and reference numeral 43 denotes a thermistor. The master end sensor 40 detects that the master 31 wound around the master roll 31a has been reduced to an extent that requires replacement, and a reflective optical sensor is used. The master set sensor 41 detects whether or not the tip of the master 31 is set on the master set roller 21, and a reflection type optical sensor is used.

  The master set sensor 41 is also used as a master type discriminating means in the present embodiment, and irradiates light from the light emitting element to the master 31 and reflects the light reflected and returned to the master 31 as shown in FIG. Detected by the light receiving element, a voltage proportional to the detected amount of received light is output to the control means 62 described later. Here, it has been found that the reflectance of light by the master 31 varies depending on the type of the master 31 (the gloss of the surface of the thermoplastic resin film, the density of the fibers constituting the porous support, etc.). Three types of masters can be discriminated: a BPII master, a C master, and an X-reformed master.

  The master tip detection sensor 42 detects whether or not the master 31 exists on the transport path between the master cutting means 27 and the reverse roller pair 28, and a reflection type optical sensor is used. The thermistor 43 is a temperature detection element, and has a function as a temperature detection unit that detects the temperature inside the plate-making transport unit 3 and outputs it to a control unit 62 described later.

A paper feeding unit 4 is disposed on the right side of the printing unit 2 and below the plate-making conveyance unit 3. The paper feed unit 4 includes a paper feed tray 44, a paper feed roller 45, a separation roller pair 46, a registration roller pair 47, and the like.
A paper feed tray 44 on which a large number of sheets P can be stacked on the upper surface is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). On the upper surface of the paper feed tray 44, a pair of side fences (not shown) for aligning the paper P in the width direction are provided. Each side fence is configured to be able to approach and separate in synchronization by a well-known rack and pinion mechanism.

  Above the left end of the paper feed tray 44, a paper feed roller 45 having a high friction resistance member on the surface is disposed. The paper feed roller 45 is rotatably supported by a bracket (not shown) provided on the apparatus main body 8 so as to be swingable. When the paper feed tray 44 is lifted, the uppermost position on the paper feed tray 44 is obtained by a predetermined pressure contact force. The sheet P. The paper feed roller 45 is rotationally driven by a stepping motor (not shown).

  A separation roller pair 46 is disposed on the left side of the paper feed roller 45. The separation roller pair 46 has an upper roller and a lower roller each having a high friction resistance member on the surface, and the upper roller is synchronized with the feeding roller 45 in the same direction when it is rotated by a stepping motor (not shown). Driven by rotation. The lower roller is pressed against the upper roller with a predetermined pressing force by a biasing force of a biasing means (not shown), and is configured to be rotatable only in the same direction as the upper roller.

  A registration roller pair 47 having a driving roller and a driven roller is disposed on the left side of the separation roller pair 46. The driving roller is rotatably supported between side plates (not shown) of the apparatus main body 8, and a rotational driving force from a plate cylinder driving unit (not shown) is transmitted through a driving force transmission unit (not shown) such as a cam. It is driven to rotate in synchronization with the plate cylinder 9. The driven roller is rotatably supported between side plates (not shown) of the apparatus body 8 and is pressed against the drive roller with a predetermined pressing force by a biasing force of a biasing means (not shown).

  A plate discharging unit 5 is disposed on the upper left side of the printing unit 2. The plate discharging unit 5 includes an upper plate discharging roller 48, a lower plate discharging roller 49, a plate discharging box 50, a compression plate 51, and the like. The upper plate discharge roller 48 is rotatably supported between plate discharge side plates (not shown), and is pressed against the lower plate discharge roller 49 by a biasing force of a biasing means (not shown). The lower plate discharge roller 49 is rotatably supported by a bracket (not shown) and is driven to rotate by a plate discharge driving means (not shown). The lower plate discharge roller 49 is configured such that its peripheral surface can be brought into contact with and separated from the outer peripheral surface of the plate cylinder 9 by moving a bracket (not shown) by a moving means (not shown). The plate removal box 50 for storing the used master 31 therein is configured to be detachable from the apparatus main body 8. The compression plate 51 that pushes the used master 31 into the discharge box 50 is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown).

  A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 52, a paper transport unit 53, a paper discharge tray 54, and the like. The peeling claw 52 is fixed to the apparatus main body 8 and enters between the peripheral surface of the impression cylinder 10 and the paper P when the impression cylinder 10 reaches a predetermined discharge position and the claw 19 is opened. The sheet P is peeled off from the impression cylinder 10. The sheet conveying means 53 is composed of a conveyor having a driving roller, a driven roller, an endless belt, and a suction fan. The sheet P peeled off by the peeling claw 52 is sucked and conveyed to the left in FIG. A paper discharge tray 54 on which a large number of printed sheets P conveyed by the sheet conveying means are stacked has one end fence 55 for aligning the sheets P on the upper surface thereof and a pair of side fences (not shown). ing.

  An image reading unit 7 is disposed on the upper part of the apparatus main body 8. The image reading unit 7 includes a contact glass 56 on which a document is placed, a pressure plate 57 that can be moved toward and away from the contact glass 56, a scanning unit 58 that scans and reads a document image, a lens 59 that focuses the scanned image, and a focusing. And an image sensor 60 such as a CCD for processing the image. An ADF unit 61 used for automatically and continuously reading a plurality of documents is disposed on the pressure plate 57.

  FIG. 4 shows a block diagram of the control means of the stencil printing apparatus 1. A control means 62 comprising a well-known microcomputer having a CPU 63, ROM 64, RAM 65, control base 67 shown in FIG. 5 and the like inside is an operation signal from an operation panel 66 disposed on the upper front surface of the apparatus body 8. Based on detection signals from various sensors provided in the main body 8, operations of the printing unit 2, the plate making and conveying unit 3, the paper feeding unit 4, the plate discharging unit 5, the paper discharging unit 6, and the image reading unit 7 of the stencil printing apparatus 1. To control each.

  The control means 62 reads out the basic operation program of the stencil printing apparatus 1 stored in the ROM 64 and controls the overall operation of the stencil printing apparatus 1 in accordance with each input signal, as well as the detection signals of the master set sensor 41 and the thermistor 43. Accordingly, the operations of the fans 37a to 37c, 38a, and 38b are controlled. The fans 37a to 37c, 38a, and 38b are controlled based on software stored in the ROM 64. The operation and non-operation of the fans 37a to 37c, 38a and 38b are controlled by the ports 1 to n of the fan control signals provided in the CPU 63 (this embodiment In the embodiment, n = 5 is turned on or off, so that the corresponding fans (in this embodiment, port 1 is the suction fan 37a, port 2 is the suction fan 37b, port 3 is the suction fan 37c, port 4 Individually controls the operation of the blower fan 38a and the port 5 corresponds to the blower fan 38b). When the air volume of each fan is controlled, an electrically controllable switch SW shown in FIG. 5 is used, and a switch switching signal is output from the CPU 63, whereby the fan power supply voltage is set to V1 (for example, 24V) or V2. Control is performed by switching to (for example, 12V) (the air volume is decreased by switching to V2). In this embodiment, the air volume is adjusted digitally using the switch SW, but the voltage value may be varied to adjust the air volume in an analog manner.

  In the ROM 64, in addition to the basic operation program of the stencil printing apparatus 1, each fan operation program corresponding to the type of master detected by the master set sensor 41 and each fan corresponding to the temperature information detected by the thermistor 43 are stored. An operation program is stored. Specifically, the three types of masters used in the present embodiment are detected by the detection voltage sent from the master set sensor 41, and if the detection voltage is 1.0 V or less, they are detected as BPII masters and detected. If the voltage is 1.1 to 1.3V, it is detected as the C master, and if the detected voltage is 1.4V or more, it is detected as the X-modified master, and the detected master type is stored in the RAM 65. The rigidity that is the waist strength of each master is BPII master <C master <X modified master. When the detected master is the BPII master, the fans 37a, 37b, 37c, 38a, 38b are all driven with the maximum air volume, and when the detected master is the C master, only the suction fans 37a to 37c are driven with the maximum air volume, and the detected master is the X-reform master Stores an operation program for driving the fans 37a, 37b, 37c, 38a, and 38b with a reduced air volume. In addition, when the temperature and humidity become high, excess moisture is contained in the master and it is easy to generate a conveyance jam. When the temperature is low, the master is stuck due to static electricity and the conveyance jam is likely to occur. In order to prioritize the plate feeding performance when the temperature deviates from 10 to 30 ° C., for example, an operation program for driving all the fans 37a to 37c, 38a, and 38b with the maximum air flow regardless of the type of the master is stored.

Based on the above configuration, the operation of the stencil printing apparatus 1 will be described below with reference to the flowchart shown in FIG.
When the cover (not shown) of the plate-making transport unit body 3a is opened and the master roll 31a is set in the master storage means, a sensor (not shown) detects this and detects the master set roller 21, platen roller 22, tension roller pair 25, static elimination Each of the rollers 26 operates, and the tip of the master 31 is pulled out from the master roll 31a and conveyed to a predetermined position on the upper surface 27b (ST1). During this conveyance, the master set sensor 41 detects the master 31 and outputs a detection voltage to the control means 62. The control means 62 that has received the detected power recognizes that the master 31 is correctly set (ST2), and if the detection voltage is not input within a predetermined time after the operation of the master setting roller 21, the control means 62 Determines that the master 31 has not been set correctly, stops the stencil printing apparatus 1 and displays on the operation panel 66 that a master setting error has occurred (ST3).

  Next, after a manuscript is set on the contact glass 56 by an operator, when a plate making start key (not shown) on the operation panel 66 is pressed, the scanning unit 58 scans the manuscript image to perform an image reading operation. The read image is sent to the image sensor 60 and converted into image data, and then sent to the control means 62.

  In parallel with the image reading operation, a plate removal operation is performed. When the plate making start key is pressed, the plate cylinder 9 starts rotating at a low speed and stops at a predetermined plate discharging position. After the plate cylinder 9 is stopped, the lower plate discharge roller 49 comes into contact with the outer peripheral surface of the plate cylinder 9 and is rotated after the clamper 11 is opened, and the use of the previous plate wound on the outer peripheral surface of the plate cylinder 9 is used. The finished master is scooped up by the lower discharge roller 49. The scooped-up used master is nipped and conveyed by each of the plate discharge rollers 48 and 49 and the plate cylinder 9 is driven to rotate at a low speed, thereby being accommodated in the plate discharge box 50. When all the used masters are peeled off from the outer peripheral surface of the plate cylinder 9, the plate cylinder 9 stops by rotating to a predetermined plate feeding position where the clamper 11 is located almost right side, and the clamper 11 is released to make the stencil. The printing apparatus 1 enters a plate feeding standby state.

  In parallel with the image reading operation and the plate discharging operation, the plate making transport unit 3 performs the plate making operation. When the plate making start key is pressed, the stepping motor 32 is operated to operate the master set roller 21, the platen roller 22, the tension roller pair 25, and the static elimination roller 26, respectively, and the stepping motor 34 is operated to operate the reverse roller pair 28. Is activated and the master 31 is conveyed. The conveyed master 31 is overheated and melt-pierced on the surface of the thermoplastic resin film according to the image data read when passing through the thermal head 23 to form a plate-making image. At this time, the movable guide plate 36 occupies the guide conveyance position shown in FIG.

  When the leading end of the master 31 is sandwiched between the pair of reverse rollers 28, the operation of the stepping motor 34 is stopped, the operation of the pair of reverse rollers 28 is stopped, and a solenoid (not shown) is operated to move the movable guide plate 36 in FIG. It occupies the deflection forming position shown in FIG. At the same time, the control means 62 recognizes the temperature information from the thermistor 43, determines whether the environmental temperature is within a preset temperature range (ST4), and is within the preset temperature range. In this case, the type of the master 31 is recognized based on the detection voltage from the master set sensor 41 (ST5).

  Next, the control means 62 controls the operation of each fan 37a, 37b, 37c, 38a, 38b. Here, if the environmental temperature is outside the preset temperature range in ST4, all the ports 1 to 5 are turned on, and the switches SW are switched so that the power supply voltage becomes V1, and each fan 37a. , 37b, 37c, 38a, 38b are all driven with the maximum airflow (ST6).

  When the ambient temperature is within the preset temperature range in ST4, the control means 62 controls the operation of each fan 37a, 37b, 37c, 38a, 38b based on the rigidity corresponding to the type of the master 31. (ST7). When the detection voltage from the master set sensor 41 is 1.0 V or less, the control means 62 recognizes that the master 31 is a BPII master, turns on all the ports 1 to 5 and the power supply voltage is V1. The switches SW are switched so that the fans 37a, 37b, 37c, 38a, and 38b are all driven at the maximum air volume. When the detection voltage from the master set sensor 41 is 1.1 to 1.3 V, the control means 62 recognizes that the master 31 is the C master, turns each port 1 to 3 on, and sets each port 4, 5 The switch SW corresponding to each of the ports 1 to 3 is switched so that the power supply voltage becomes V1, and only the suction fans 37a, 37b, and 37c are driven at the maximum air volume. When the detection voltage from the master set sensor 41 is 1.4 V or higher, the control means 62 recognizes that the master 31 is the X-modified master, turns on all the ports 1 to 5 and the power supply voltage is V2. The switches SW are switched so that the fans 37a, 37b, 37c, 38a, and 38b are all driven with a reduced air volume.

  Even after the reversing roller pair 28 is stopped, the stepping motor 32 continues to operate, and the master 31 is drawn out from the master roll 31a. The master 31 made by plate making is sucked and blown by the fans 37 a, 37 b, 37 c, 38 a, and 38 b whose operation is controlled by the control means 62, and is stored in the flexure box 35 through the opening 35 f. When the plate discharge operation is completed and the plate cylinder 9 is in a plate feed standby state, and when a master plate 31 having a predetermined amount or more is stored in the bending box 35, the stepping motor 34 is operated to turn the pair of reverse rollers 28. Is operated, and the master 31 mastered in the bending box 35 is conveyed toward the open clamper 11.

  When the control means 62 determines that the tip of the master 31 has reached a predetermined position between the clamper 11 and the outer peripheral surface of the plate cylinder 9 based on the number of steps of the stepping motor 34, the clamper 11 is closed and the tip of the master 31 is moved. While being held on the outer peripheral surface of the plate cylinder 9, the operation of the stepping motor 34 is stopped and the operation of the reverse roller pair 28 is stopped. After the clamper 11 is closed, the plate cylinder 9 is intermittently rotated at a low speed in the direction indicated by the arrow in FIG. 1, and the master 31 is wound around the plate cylinder 9. At this time, the reversing roller pair 28 is driven and rotated by the action of a not-shown one-way clutch, and a predetermined tension is applied to the master 31 between the plate cylinder 9 and the reversing roller pair 28, and wrinkles are generated on the master 31. Is prevented.

  When the plate making operation proceeds and the control means 62 determines that the master 31 for one plate has been made based on the number of steps of the stepping motor 32, the operation of the stepping motor 32 is stopped and the master set roller 21, the platen roller 22, the tension roller The operations of the pair 25 and the static eliminating roller 26 are stopped, and the master cutting means 27 is operated to cut the master 31. All the cut masters 31 are drawn out from the plate-making conveyance unit 3 by the rotation of the plate cylinder 9 and wound on the outer peripheral surface of the plate cylinder 9.

  When the winding operation is completed, the movable guide plate 36 occupies the guide conveyance position, and the sheet feed roller 45 is operated to feed one sheet P from the sheet feed tray 44, and the plate cylinder 9 is moved at a low speed. 1 is rotated in the direction of the arrow 1. The fed paper P is separated by the separation roller pair 46 and then temporarily stopped by the registration roller pair 47, and the front end of the plate 31 in the master 31 wound on the plate cylinder 9 is the impression cylinder 10. The registration roller pair 47 is rotationally driven at a predetermined timing to reach the position corresponding to the sheet and is fed toward the printing unit 2.

  The fed paper P is held on the peripheral surface of the impression cylinder 10 by the open gripping claw 19 pinching the tip, and then is moved to a position corresponding to the plate cylinder 9 by the rotation of the impression cylinder 10. Sent. Thereafter, a pair of arm members (not shown) that rotatably supports the impression cylinder 10 swings, so that the impression cylinder 10 presses the paper P on the peripheral surface against the master 31 wound around the plate cylinder 9. By this pressing, the opening portion of the plate cylinder 9, the master 31, the paper P, and the impression cylinder 10 are brought into pressure contact with a predetermined pressure contact force, and the ink supplied to the inner peripheral surface of the plate cylinder 9 by the ink roller 14 is in the master 31. After penetrating the porous support, it is transferred to the paper P, and so-called printing is performed. The paper P after printing is peeled off from the outer peripheral surface of the impression cylinder 10 by the peeling claw 52 when the gripping claw 19 is opened at a predetermined position, conveyed by the paper conveying means 53, and discharged onto the paper discharge tray 54. Is done.

  After the printing operation, the operator operates a key on the operation panel 66 to set a print image position or a printing speed, and then presses a test printing key (not shown) on the operation panel 66. When the trial printing key is pressed, the plate cylinder 9 is driven to rotate at a rotational peripheral speed based on the set printing speed, and a sheet of paper P is fed from the paper supply unit 4 and is the same as at the time of printing. Trial printing is performed. The operator confirms the image by trial printing, sets the number of prints on the operation panel 66, and then presses a print start key (not shown) on the operation panel 66. As a result, the paper P is continuously fed from the paper supply unit 4 and printing is performed in the same manner as the above-described test printing. Then, when all the set number of prints has been consumed, all the operations are stopped, and the stencil printing apparatus 1 enters the print standby state again.

  When the control means 62 determines that the master 31 for the next version remains on the master roll 31a by the master end sensor 40 after the above winding operation is completed, the detected voltage from the master set sensor 41 is controlled by the control means. 62 (ST8). When the master end sensor 40 determines that the remaining master roll 31a is small, the control means 62 displays that fact on the operation panel 66.

  After ST8, for example, when making the next plate during the printing operation, the operator places the next document on the contact glass 56 and presses the plate making start key. When the plate making start key is pressed, the control means 62 again inputs the detection voltage from the master set sensor 41 (ST9). If there is no input, it is determined that the master 31 is not set correctly and stencil printing is performed. The apparatus 1 is stopped and a message indicating that a master set error has occurred is displayed on the operation panel 66 (ST10).

  When the detection voltage from the master set sensor 41 is input, the control means next recognizes the temperature information from the thermistor 43 (ST11), and if it is within the preset temperature range, it is stored in the RAM 65. The master type is called, and the fans 37a, 37b, 37c, 38a, 38b are controlled in the same manner as in the previous version (ST12). When the recognized temperature information is outside the preset temperature range, all the ports 1 to 5 are turned on and the switches SW are switched so that the power supply voltage becomes V1, and each fan 37a, 37b, 37c, 38a, 38b are all driven with the maximum airflow (ST13).

  When the main power supply of the stencil printing apparatus 1 is turned off after the plate making operation is turned on again, or when the plate making transport unit 3 is detached from the apparatus main body 8 and is attached again, the stencil printing apparatus 1 is stored in the RAM 65. The master type is reset (ST14), and the type of the master 31 is recognized by the control means 62 based on the detection voltage from the master set sensor 41 again.

  According to the above-described configuration, the control unit 62 determines the type of the master based on the detection result by the master set sensor 41, and the control unit 62 determines each of the fans 37a and 37b based on the rigidity according to the determined type of the master. , 37c, 38a, 38b, and the air volume are controlled, and by controlling each fan in accordance with the rigidity of the master, a good plate feeding operation can be performed without increasing the cost.

  Further, the control means 62 determines the environmental temperature based on the detection result by the thermistor 43, and the control means 62 controls the air volume of each fan 37a, 37b, 37c, 38a, 38b based on the determined environmental temperature. It is possible to perform a good plate feeding operation by preventing generation of a plate feeding jam caused by sticking of a master due to static electricity in a low temperature environment and sticking of a master due to moisture in a high temperature and high humidity environment.

  Further, since the master set sensor 41 determines the type of the master 31 when the master roll 31a is attached to the apparatus body 8, the master 31 does not always determine the type of the master 31, and the load of the operation program is reduced. Can be reduced.

  In the embodiment described above, the master set sensor 41 determines the type of the master 31 during the plate making operation. However, when the main power of the stencil printing apparatus 1 is turned on, the master set sensor 41 sets the type of the master 31. A configuration for determining, or a configuration for determining the type of the master 31 by the master set sensor 41 when the plate-making transport unit 3 is mounted on the apparatus main body 8 may be adopted. Also in this case, the determined type of the master 31 is stored in the RAM 65, and when the main power source of the stencil printing apparatus 1 is turned on again or after the stencil conveying unit 3 is removed from the apparatus main body 8, it is mounted again. In this case, it is desirable that the master type stored in the RAM 65 is reset.

1 is a schematic front view of a stencil printing apparatus adopting an embodiment of the present invention. It is a schematic front view of the plate-making conveyance part used for one Embodiment of this invention. It is a schematic perspective view of the master stock means used for one Embodiment of this invention. It is a block diagram of the control means used for one Embodiment of this invention. It is the schematic explaining the control board inside the control means used for one Embodiment of this invention. It is a flowchart which shows the control action of the control means in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printer 3 Plate making conveyance part (plate making conveyance unit)
8 Printer main unit (device main unit)
9 Plate Cylinder 29 Master Stock Means 31 Master 33 Plate Making Transport Means 35 Main Body (Flexible Box)
35a, 35b, 35c Folding storage part 37a, 37b, 37c Fan (suction fan)
38a, 38b Fan (fan)
41 Master type discrimination means (master set sensor)
43 Temperature detection means (thermistor)
62 Control means

Claims (10)

In a stencil printing apparatus comprising a plate making and conveying means for making a plate and conveying a master, a master stock means for storing the master conveyed by the plate making and conveying means, and a master type determining means for determining the type of the master,
The master stock means has a main body for storing the master transported by plate making, and a plurality of fans that operate to introduce the master transported by plate making into the main body,
A stencil printing apparatus comprising control means for controlling the operation of each fan in accordance with the type of the master. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the control means controls the operation and non-operation of each fan for each suction fan. In the stencil printing apparatus according to claim 2,
The stencil printing apparatus, wherein the control means increases the number of operating each of the fans as the rigidity of the master increases. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the control means controls the air volume of each fan. In the stencil printing apparatus according to claim 4,
The stencil printing apparatus, wherein the control means increases the air volume of each fan as the rigidity of the master increases. In the stencil printing apparatus according to any one of claims 1 to 5,
A stencil printing apparatus comprising temperature detecting means for detecting an environmental temperature, wherein the control means controls the operation of each fan in accordance with the environmental temperature. In the stencil printing apparatus according to claim 6,
The stencil printing apparatus, wherein the control means drives all the fans with a maximum air flow when the environmental temperature is out of a preset range. In the stencil printing apparatus according to any one of claims 1 to 7,
At least a plate-making conveyance unit that includes the plate-making conveyance means and is detachable from the printing apparatus main body. When the plate-making conveyance unit is mounted on the printing apparatus main body, the master type determination means determines the type of the master. A stencil printing apparatus. In the stencil printing apparatus according to any one of claims 1 to 7,
The stencil printing apparatus, wherein when the main power is turned on, the master type discriminating unit discriminates the type of the master. The stencil printing apparatus according to any one of claims 1 to 9,
The stencil printing apparatus, wherein the main body has a plurality of folding storage portions that fold the master transported by plate making in a plurality of stages.

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