JP2009190201A - Stencil printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate an image position misalignment of a stencil printing device due to improper operational timing of the roller which presses a paper onto the press roller during the reverse conveyance whereby the paper is reversed along the circumference surface of the press roller after printing one side of the paper while the leading end thereof is fed into the nip between the plate cylinder and the press roller to print the other side of the paper. <P>SOLUTION: When the printing speed is high, the operational timing of the roller driving means 72 is made earlier than when the printing speed is low, and the operational timing is made later when the printing speed is low. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stencil printing apparatus capable of perforating a stencil master made of a thermoplastic resin film and winding the stencil master on a porous cylindrical plate cylinder to continuously perform double-sided printing or the like.

  A master made by engraving is wound around a porous cylindrical plate cylinder having ink supply means and supported rotatably around its own central axis, and the paper is pressed onto the plate cylinder by pressing means, and the master 2. Description of the Related Art A stencil printing apparatus is known that performs printing by making ink miserable through a perforation portion.

  More specifically, the porous cylindrical plate cylinder is a drum having a rotatable drum configuration in which a porous support cylinder is wound with a plurality of layers of resin or metal mesh mesh screens. The master is bonded to a thermoplastic resin film (thickness of about 1 to 2 μm is generally used) and a porous support made of Japanese paper fiber or synthetic fiber, or a mixture of Japanese paper and synthetic fiber. A stencil master having a laminated structure (hereinafter simply referred to as a master) is used.

  The master's film surface is brought into contact with the thermal head, heated and punched while transporting the master with a platen roller or the like, the master that has been made is wound around the plate cylinder, and the paper is pressed by pressing means such as a press roller. Then, ink is oozed out from the opening portion of the plate cylinder and the perforation portion of the master to perform printing. Such a stencil printing apparatus is also referred to as a thermal digital stencil printing apparatus.

  In recent years, double-sided printing for printing both front and back sides of paper is performed using such a stencil printing apparatus in order to reduce consumption of printing paper. Conventionally, double-sided printing has been carried out by printing a single-sided paper and then turning over the printed paper discharged and stacked on the paper discharge tray again and then printing the other side.

  However, in the conventional double-sided printing method, the printing operation is performed twice, which increases the printing time and neatly arranges the sheets stacked on the paper discharge tray and sets them again in the paper feed unit. It was very troublesome. Therefore, it is desired to propose a device that can perform double-sided printing at the same time, such as printing with two plate cylinders facing each other. However, the size of the device is increased, and one plate cylinder does not have a plate-making master during single-sided printing. Since it is necessary to wind up the master, the master is wasted and the operation is troublesome.

  Therefore, although there are restrictions on the paper, the plate making surface is divided into two and the paper is reversed with respect to the two plate making surfaces in the master feed direction while continuously pressing the pressing means such as a press roller against the plate cylinder. A method of printing is being tried.

  In this double-sided printing method, when the paper is reversed and passed, it is stopped by the regulating means in order to correct the position of the print image and the skew, and is stopped in a state where the paper front end position is aligned. Thereafter, a plurality of roller rollers arranged coaxially in a stepped roller shape are pressed against the press roller, and the paper released from the stop is fed between the roller roller and the press roller, and the frictional force between these rollers and the paper is increased. Printing is performed by conveying the paper by using it and feeding the paper into the nip portion between the press roller and the plate cylinder (see, for example, Patent Document 1 and FIG. 1).

  Here, as in the technique of Patent Document 1, when the conveyance of the paper is controlled by performing the contact and separation operation of the roller roller with respect to the press roller by a driving means such as a solenoid, the press roller is particularly in a high-speed printing situation. The roller roller, which is stationary in a state of being separated from the roller, is displaced from the separated state by the driving means in contact with the arrival of the sheet and comes into contact with the press roller until the driven rotation. The inertial force acts as a load that delays the paper, and therefore the paper position fluctuates, which tends to shift the image position during printing.

  In addition, since the stationary paper is conveyed by being pressed against the press roller that rotates at high speed, the paper weight is changed when the paper weight changes depending on the paper size or paper type (thickness). Before and after the change, the amount of slippage of the paper when it starts to move in contact with the press roller changes, and the leading edge of the paper at the start shifts. The misalignment of the leading edge of the paper appears as a change in the image position when printing, and thus causes a problem in terms of image quality.

  In addition, the coefficient of friction on the surface of the paper greatly changes due to moisture absorption. For this reason, for example, in a low humidity environment, the paper surface is slippery and the paper surface is slippery.On the other hand, in a high humidity environment, the fibers become damp and difficult to slide. There is also a problem that the leading edge position of the paper at the start varies and the image position when printed is likely to shift. For example, if the plate cylinder diameter is φ180 mm and the number of printed sheets is 120 cpm, the image position changes greatly even if the start changes by several ms since it moves about 1.1 mm in 1 ms. In order to avoid this, it is necessary to adjust the image position in accordance with the size of paper to be used, the humidity, and the printing speed.

JP 2005-238774 A

  The present invention has been made under the circumstances described above, and an object of the present invention is to provide a stencil printing apparatus that can eliminate image position deviation during double-sided printing.

In order to achieve the above-mentioned object, the invention according to claim 1 has an ink supply means, and a master made by making a plate is wound around a porous cylindrical plate cylinder supported rotatably around its own central axis. A stencil printing apparatus that performs printing by pressing paper onto the plate cylinder with pressing means and causing ink to misfire through a punching portion of the master, wherein the master is divided into two front and rear surfaces in the feeding direction. Plate-making means for making a plate, press-switching means for pressing the paper on the front and rear surfaces in the feeding direction, and a state where the paper on which the first surface which is one of the front and rear surfaces is printed is in contact with a stopper And then, the roller roller is displaced in accordance with the position of the second surface, which is the other one of the two front and rear surfaces, and is brought into contact with the pressing means, and the sheet is moved by the pressing means and the roller roller. Nipping and conveying the paper while inverting it, In the pressing means stencil printing apparatus configured to perform printing on both sides to press the paper to the serial plate cylinder, in accordance with the printing speed, and configured to control the timing of the displacement of the Rorakoro.
According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, when the printing speed is relatively fast, the rising timing of the roller rollers is controlled in a direction that is faster than when the printing speed is relatively slow. In the case where the roller roller is late, the rise timing of the roller roller is controlled to be delayed as compared with the case where the roller is fast.
According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect, the timing of the displacement of the roller roller is controlled according to the weight of the paper.
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, if the weight of the paper is relatively heavy, the roller roller is controlled to move in a higher direction as compared with the case where the weight of the paper is relatively light. If the weight is light, the roller roller ascending timing is controlled to be delayed as compared with the case where the weight is heavy.
According to a fifth aspect of the present invention, in the stencil printing apparatus according to the fourth aspect, the weight of the weight is determined and controlled by a factor of the size and thickness of the paper.
According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fifth aspects, the roller roller is driven by one or more solenoids, and the roller roller is driven by the solenoid according to the internal temperature of the solenoid. The operation timing is controlled.
According to a seventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, the operation timing of the solenoid is controlled in accordance with the environmental humidity of the place where the stencil printing apparatus is set. Configured.

  ADVANTAGE OF THE INVENTION According to this invention, the stencil printing apparatus which can eliminate the shift | offset | difference of the image position at the time of double-sided printing by simple means can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Configuration of Stencil Printing Apparatus Suitable for Implementation of the Present Invention>
In FIG. 1 showing the main components of a stencil printing apparatus suitable for carrying out the present invention, a plate making apparatus A is located near the upper left part of the plate cylinder 1. In the plate making apparatus A, the master 8 is wound around a roll 8a, and the roll core 8b is rotatably supported by holder means (not shown).

  The master 8 drawn out from the roll 8a is pressed against a platen roller 9 rotatably supported by a side plate (not shown) of the plate making apparatus A by a thermal head 10 having numerous heating elements. The platen roller 9 is connected to a stepping motor (not shown), and is driven to rotate clockwise so that the master 8 is fed out from the master roll 8a.

  The thermal head 10 is urged against the platen roller 9 by a spring member (not shown). A conveyance roller 12 is disposed on the downstream side of the platen roller 9 in the master conveyance (right side in the drawing). The transport roller 12 is composed of a pair of rollers rotatably supported by a pair of side plates (not shown) of the plate making apparatus A so as to be in a pressed state, and the rotational speed is slightly higher than the peripheral speed of the platen roller 9. The peripheral speed is set, and an appropriate tension suitable for plate making is applied by rotating while sliding with the master 8.

  Up and down blades (guillotine type) or rotary blades for cutting the master 8 made to an appropriate length on the upstream side of the transport roller 12 and on the downstream side of the thermal head 10 in the transport direction of the master 8 indicated by the arrow 63. A movable type cutter 11 is provided, and a master guide plate 13 that guides the leading end of the master 8 is provided on the downstream side of the conveying roller 12. The master guide plate 13 is fixed between side plates (not shown) of the plate making apparatus A.

  These plate cores 8b, platen roller 9, thermal head 10, cutter 11, transport roller 12, master guide plate 13 and the like constitute plate making apparatus A.

  Referring to FIG. 2, the stencil printing apparatus includes a scanner device 50 as a document reading device. In the document reading apparatus, a scanner device 50 is provided between the document table 50a and the sheet discharge table 50b, and the document is read by the CCD or the like while the document is conveyed from the document table 50a to the sheet discharge table 50b. It is converted into a signal and transmitted to a control device 51 having a CPU. When an electrical signal is transmitted from the control device 51 to the plate making apparatus A, the heating element of the thermal head 10 is energized, the master 8 is heated and perforated, and plate making is performed. Selection of normal single-sided printing or double-sided printing is executed by inputting an instruction from the operator via the operation panel 52. The scanner device 50 may be configured integrally with the stencil printing device, or may be a method in which a scanner device configured separately is used.

  Returning to FIG. 1, in the vicinity of the lower right part of the plate making part A, a plate cylinder formed by winding a plurality of layers of a porous support cylindrical body and a mesh screen of a resin or metal mesh body (not shown) covering the outer periphery thereof. 1 is fixed to a flange (not shown) rotatably supported by an ink pipe 5 as a support shaft, and is configured to be driven to rotate clockwise by a driving force transmitted by a drive transmission hand (gear, etc.) (not shown). Has been.

  An ink roller 2 having an ink roller shaft rotatably supported by a side plate (not shown) fixed to the ink pipe 5 is provided inside the plate cylinder 1 by a drive transmission means (gear, belt, etc.) not shown. Synchronously with the rotation, it is driven to rotate in the same direction. A doctor roller 3 is provided with a slight gap from the outer peripheral surface of the ink roller 2, and the ink in the ink reservoir 4 formed in the wedge-shaped space between the ink roller 2 and the doctor roller 3 is formed into a thin film on the outer surface of the ink roller 2. Supply.

  The ink in the ink reservoir 4 is sucked from an ink pack or the like provided outside the plate cylinder by an ink supply device (not shown) and supplied from the supply hole 5a of the ink pipe 5, and the rotation of the ink roller 2 and the doctor roller 3 is performed. Are kneaded.

  A stage 6 made of a magnetic material is provided along one bus bar of the plate cylinder 1 on the surface of the non-opening portion of the plate cylinder 1. A clamper shaft 7 a is rotatably supported in parallel with the stage 6. A clamper 7 is integrally fixed to the clamper shaft 7a, and the clamper shaft 7a is opened / closed at a predetermined position by rotating the clamper shaft 7a forward / reversely by an opening / closing device (not shown).

  The plate cylinder 1 can be engaged and disengaged integrally with an ink pack or the like in its own axial direction, and is provided so as to be movable in the axial direction by an image moving device (not shown). Below the plate cylinder 1, an arm shaft 16a that is rotatably supported by a casing side plate (not shown), and a pressing means whose shaft portion is rotatably supported by a pair of press roller arms 16 fixed to the arm shaft 16a. A press roller 15 is provided.

  An arm (not shown) is fixed to one end side of the arm shaft 16a, and a rotatable cam follower is provided. The cam follower is attached to a plurality of cams rotatably supported by a casing side plate (not shown) with springs or the like. The contact is made by the urging force of the urging means.

  The plurality of cams are rotated in synchronism with the plate cylinder by a driving unit (not shown), and the press roller 15 as a pressing unit can be brought into contact with the plate cylinder 1 at a predetermined position or can be separated. ing. For example, a method is adopted in which a plurality of cams are switched to switch the pressing range such as the first surface, the second surface, and the entire surface.

  The press roller 15 is rotationally driven in a direction opposite to the plate cylinder 1 at substantially the same peripheral speed as the plate cylinder 1 by a driving means (not shown). As shown in FIGS. 3 and 4, a plurality of roller rollers 17 are rotatably supported on a casing side plate (not shown) so as to be separated from the press roller 15. The roller roller arm 71 is rotatably supported by a pair of rollers, and the plunger is sucked when a drive current is conducted to a plurality of solenoids 72 connected to the roller roller arm 71, and at a timing set in advance at a minimum speed. As the roller roller arm 71 rotates clockwise, the roller roller arm 71 comes into contact with the press roller 15 rotating at substantially the same peripheral speed as the plate cylinder 1 via a single-side printed paper 45A, which will be described later. Accordingly, the sheet 45A is conveyed while rotating in the opposite direction to the press roller 15.

  The roller roller 17 is made of a lightweight resin and the like, and a lightweight material is used so that the inertial force becomes as small as possible with respect to the required hardness. The solenoid 72 is controlled by the control device 51 based on the printing speed (plate cylinder rotation speed) used, the size of the paper 45, the paper thickness information, and the environmental humidity information by a humidity sensor (not shown) provided near the paper feed unit. The energization timing is controlled.

  The size of the paper 45 can be obtained by detecting the opening / closing amount of a pair of left and right side fences that are provided in a paper feed tray of a paper feeding device (not shown) and guide the paper with the side edges facing each other. For example, each side fence has racks that extend to positions facing each other, and is opened and closed in conjunction with the rotation of pinions that are sandwiched between these racks and meshed in common. By detecting, it is possible to detect the opposing distance between the side fences, that is, the width size of the paper.

  There is a paper feeding unit on which paper is stacked at an upstream position of the registration roller 14, and the paper stacked on the paper feeding tray is separated into one sheet by a separation paper feeding unit and sent to the registration roller 14. A thickness sensor for detecting the transmitted light of the sheet is provided in the sheet conveyance path between the separation sheet feeding unit and the registration roller 14, and the sheet thickness information is detected by detecting the intensity of the transmitted light. Can do. Means for obtaining information on the size and thickness of these sheets is well known, and is disclosed, for example, in Japanese Patent No. 3788650.

The size and thickness of these papers are regarded as factors for judging the weight of the paper, and this information is collected in the control device 51, and the weight of the paper used for printing is automatically grasped by collating with a data table prepared in advance. To be able to.
When the weight of the paper is grasped in this way, the roller roller rise timing is controlled so that it is lighter when the paper weight is heavy, and the roller roller rise timing is delayed than when the paper weight is heavy. To control.

  In this embodiment, as the printing speed is increased, the roller roller 17 is moved at a high rising speed or the rising timing is started to bring the paper 45 into contact with the press roller 15 and the paper 45 starts to move. In consideration of the inertial force of the roller roller 15 which is a load of the above, the control device 51 controls in a direction to increase the speed by a predetermined amount.

  For example, when the printing speed is relatively fast, control is performed so that the rising timing of the roller roller 17 is advanced compared to when the printing speed is slow, and when the printing speed is relatively slow, the rising timing of the roller roller is delayed compared to when the printing speed is relatively fast. Control in the direction.

In addition, when the basis weight is 64 g / m ² , for example, in accordance with the basis weight of the paper used (which is mainly set with the high-quality paper used here), depending on the detected size and thickness When the basis weight is reduced, the weight of the paper 45 to be passed is light and the slip amount is reduced when the paper 45 is moved in contact with the press roller 15, so that the energization timing to the solenoid 72 is controlled to be delayed by a preset time, On the contrary, when the basis weight increases and the weight increases, the slip amount increases, so that the energization timing is controlled in advance in a predetermined amount. In this way, the timing of displacement of the roller rollers is controlled according to the weight of the paper.

  In addition, when the humidity information from the humidity sensor is added to this and the surface of the paper 45A is slippery when the humidity is low, the energization timing is advanced by an amount corresponding to the amount of slippage. Since it becomes difficult, the energization timing is controlled to be delayed.

  The temperature of the solenoid 72 increases with the frequency of energization, but if the internal resistance increases due to this temperature increase, the attractive force decreases due to current drop or the like, and if the attractive force decreases, the operation of the solenoid 72 is delayed from the initial stage.

  Therefore, when the control device 51 determines that the internal resistance has increased and the attractive force has decreased due to current drop or the like, the internal temperature is increased so as not to cause a delay due to the increase in internal resistance due to the temperature increase. Control is made so that the operation timing is advanced by an amount commensurate with the operation delay of the solenoid 72.

  The control device 51 is preliminarily provided with a data table showing the relationship between the delay amount of the solenoid 72 accompanying the rise in the internal temperature and the operation timing advance amount corresponding to the delay amount. The operation timing is corrected based on temperature information from a temperature detection sensor 73 provided in 72.

  A stopper 27 for correcting the start position and skew of the paper 45A by contacting the leading edge of the paper 45A is provided downstream of the roller roller 17 in the conveyance direction of the paper and above the roller roller 17. In FIG. 1, FIG. 3, FIG. 4, etc., the bent part 27b of the stopper 27 is a part for receiving the leading edge of the paper and stopping the paper.

  As shown in FIG. 4, the roller roller 17 positioned below the stopper 27 rises when the sheet is conveyed, contacts the press roller 15, and conveys the sheet with the sheet nipped with the press roller 15. Since the stopper 27 is positioned on the ascending path of the roller roller 15, a window-like opening portion 27 a is provided in the stopper 27 according to the positions of the plurality of roller rollers 17 as shown in FIG. It has been.

  In FIG. 1, a guide plate 18 is provided on the right side of the press roller 15 to guide the paper 45 </ b> A by curving in the vicinity of the outer circumferential surface of the press roller 15. The outer surface of the press roller 15 is uniformly formed with fine glass beads or the like used for preventing smearing of printed matter by an offset printing machine or the like and comes into contact with the surface of the plate cylinder 1 or the like, which will be described later. The transfer stain due to the ink on the image surface of the printed paper 45A is minimized. In addition, the surface of the roller guide plate 18 (the surface facing the press roller 15) is coated with a fluorine resin (tetrafluoroethylene resin or the like) having a low friction coefficient in order to reduce resistance during paper conveyance.

  On the right side of the press roller 15, a sheet feeding unit (not shown), a separation sheet feeding device that separates and feeds the sheets 45 stacked on the sheet feeding tray in the sheet feeding unit, and the sheet 45 separated and fed. A registration roller 14 is provided for transporting to the nip portion between the plate cylinder 1 and the press roller 15 in a timely manner.

  On the lower left side of the plate cylinder 1 (position from 7 o'clock to 8 o'clock on the clock face), a peeling claw 26 that is rotatably supported so as to swing in the vicinity of the plate cylinder 1, A peeling fan 28 that blows air on the surface to peel off the paper is provided.

  Below the peeling claw 26, a shaft portion 26a is rotatably supported by a pair of casing side plates (not shown), and is provided with a discharge roller front 19 and a discharge roller rear 20 which are driven to rotate counterclockwise by a driving device (not shown). A paper discharge transport device 60 including a paper discharge belt 21 stretched between the front and rear paper rollers 19 and 20 and a suction fan 22 that sucks the paper 45 to the upper and lower surfaces of the paper discharge belt 21 is provided.

  A switching guide plate 23 is located between the paper discharge conveyance device 60 and the press roller 15. The switching guide plate 23 is fixed to a shaft that is rotatably supported by a housing side plate (not shown), and swings at a predetermined position with the shaft portion as a fulcrum by a driving means (solenoid, stepping motor, etc.) not shown. It is like that. Normally, as shown in FIG. 1, it is held at a position where the upper surface portion of the press roller 15 and the upper surface portion of the paper discharge belt 21 communicate with each other.

  A lower transport device 62 is provided below the paper discharge transport device 60. The lower conveying device 62 includes a front conveying roller 40 and a rear conveying roller 41 that are rotatably held, and a conveying belt 42 stretched around the conveying rollers 40 and 41, and is rotated clockwise by a drive motor or the like. Is driven to rotate. The conveyor belt 42 is intermittently driven at a predetermined timing.

  A lower suction fan 43 is provided between the conveyance belts 42 so that a later-described sheet 45A is sucked and held on the conveyance belts 42. The lower conveying device 62 is supported by a side plate portion (not shown) of the press roller 15 so that the shaft portion of the front 40 of the conveying roller is movably supported with the shaft portion of the rear 41 of the conveying roller as a fulcrum. And is configured to swing. The lower conveying device 62 is controlled by the control device 51 so as to stop after the sheet 45A reaches the stopper 17a.

  A moving means (not shown) that moves the movement guide 24 along a movement path indicated by a broken-line arrow is provided on the lower conveyance device 62. The moving guide 24 can reciprocate between the position near the rear 41 of the conveying roller shown in FIG. 1 (initial position = standby position) and the position near the press roller 15 (upper position), which is the right end position of the broken line arrow. . A clamp shaft 24a is rotatably supported on a side plate (not shown) of the movement guide 24.

  The clamp shaft 24a urges the clamp claw 24b to the movement guide 24 in a counterclockwise direction by an urging spring (not shown). A release lever (not shown) is fixed to the clamp shaft 24a. At the initial position (standby position) and the upper position, the release lever abuts on the release means provided on the housing side plate (not shown) and rotates clockwise to clamp the clamp claw 24b. At the moving position between the initial position (standby position) and the upper position, the leading end of the sheet 45A is clamped by the clamp claw 24b.

  A paper discharge tray 25 on which the discharged paper 45 is stacked is provided on the lower left side of the paper discharge transport device 60. FIG. 6 is a state diagram in which the printed paper 45A is continuously conveyed from the paper 45 and the lower conveying device.

<Printing operation of stencil printing machine>
2 is selected, and after a document (not shown) is set on the scanner device 50, a start signal (start button) is operated by operating the switch on the operation panel 52. 1 is rotated by a drive motor (not shown), and a used master is peeled off from the surface of the plate cylinder 1 by a plate discharging device (not shown) and discarded.

  The plate cylinder 1 rotates and stops until the clamper 7 is in a substantially upper position (12 o'clock position on the clock face). When the plate cylinder 1 is stopped, the clamper shaft 7a is rotated by an opening / closing device (not shown), so that the clamper 7 is released and a plate feeding standby state is entered.

  A document is sent to a document reading unit (scanner device 50). First, an image on the first surface 80a corresponding to the first half of the document 80 shown in FIG. A thermal head 10 is energized in accordance with image information via a D / D converter, a plate making control device, etc., and a platen roller 9 is rotated by a stepping motor (not shown) to convey the master 8, while the thermal film of the master 8 is The first half of the plate making in the feed direction is started.

  When the leading end of the master 8 is guided between the stage 6 and the clamper 7 by the master guide plate 13 and it is determined that the leading end of the master 8 has reached the clamper 7 by the number of steps such as a stepping motor (not shown), it is not shown. The clamper 7 is closed by the opening / closing device, and the leading end of the master 8 is clamped, and the plate cylinder 1 resumes rotation at substantially the same speed as the master conveying speed, and the master 8 thus made is wound.

  If it is determined from the number of steps of a stepping motor (not shown) that the plate-making of the first surface 8A corresponding to the first surface 80a corresponding to the first half of the original 80 and positioned in the first half of the feed direction of the master 8 is completed. 9. The rotation of the plate cylinder 1 is stopped, and the master 8 corresponding to the next second surface 80b located downstream in the feeding direction of the document 80 is brought into a plate-making standby state.

  Next, the document is automatically or reset on the document reading unit (scanner device 50), the start button or the like is pressed again, and the document is sent to the document reading unit in the same manner as described above by the start signal. The second half of the image is made as a second surface 8B at a predetermined position of the master 8 in the same manner as the first surface 8A. At this time, the plate cylinder 1 also starts to rotate at the same speed as the master conveyance speed.

  When it is determined from the number of steps of the stepping motor (not shown) that the plate making of the second surface 8B of the master 8 is completed, the cutter 11 is operated and the master 8 is cut, and the platen roller 9 and the conveying roller 12 are stopped. The rear end portion of the cut master 8 is pulled out by the rotation of the plate cylinder 1 and the winding around the plate cylinder 1 is completed.

  In this description, the plate cylinder 1 and the plate making apparatus A are temporarily stopped at the time of plate making of the second surface 8B corresponding to the latter half of the feed direction of the master 8, but instead of doing so, it is scanned in advance and stored in the memory. In order to shorten the plate making time and the first print time, it is preferable to continuously make the first surface 8A and the second surface 8B.

  The conduction timing of the solenoid 52 that operates the roller roller 17 includes the designated printing speed and temperature detection sensor 73 and the humidity information to be used (as described above, the environment by the humidity sensor (not shown) provided near the paper feed unit). A predetermined timing is selected in advance from the humidity information), and a sheet 45 (to be described later) passes through the thickness sensor and the size sensor described above so that the weight of the sheet 45 is grasped, and the final conduction of the solenoid 52 is performed. The timing is determined by the control device 51. Although the detection information of the temperature detection sensor 73, humidity sensor, thickness sensor, size sensor, and the like are collectively displayed as various sensors 90 in FIG. 2, they are individually input to the control device 51.

  When the winding of the master 8 around the plate cylinder 1 is completed, only one sheet 45 is sent out by a separation sheet feeding device (not shown), and timed by the registration roller 14, toward the question between the plate cylinder 1 and the press roller 15. Be transported. When the paper detection means (not shown) detects the entry of the paper 45, the locking means (not shown) is released, and the cam follower moves to the concave portion of the cam along the rotation of the cam (not shown), as shown in FIG. The press roller 15 continuously presses the paper 45 against the plate cylinder 1 by an urging spring (not shown), and the printing of filling the first surface 8A of the master 8 with ink is started.

  When the clamper 7 of the plate cylinder 1 passes in parallel with the above operation, the switching guide 23 is rotated counterclockwise as shown in FIG. 6 by the driving means (not shown) and stopped. The moving guide 24 is also moved from “initial position = standby position” (see FIG. 1) to an “upper position” (see FIG. 6) obliquely upward so as to sandwich the leading end position of the paper 45, and a release lever (not shown) releases the release means. By engaging with the clamp claw 24b, the clamp claw 24b rotates in the clockwise direction, and waits and stops in an open state in which the distance between the tip of the clamp claw 24b and the surface of the movement guide 24 is open.

  In FIG. 6, when the moving guide 24 stops, the paper 45 is peeled downward from the plate cylinder 1 by the switching guide 23 and the peeling fan 28, and guided to the lower surface of the movable guide 24 waiting at the “upper position” and clamped. It is inserted into the gap between the nail 24b.

  When the leading end of the paper 45 is inserted, the movable guide 24 starts to move to “initial position = standby position” (see FIG. 1) at a speed substantially equal to the transport speed of the paper 45, and a release lever and a release means (not shown). Is released, and the clamping claw 24b is rotated counterclockwise by a biasing spring (not shown) to pinch the leading edge of the paper 45 and downward while holding the leading edge of the paper 45. Transport. FIG. 7 shows a state during the conveyance.

  The press roller 15 is pressed within the range of the first surface 8A by a cam switching mechanism (not shown) and then returns to the initial position where the press cylinder 15 is interrogated and stops. The paper 45 is held by the movable guide 24 by the clamp claw 24b and is moved and conveyed together with the movable guide 24. When the movable guide 24 stops at “initial position = standby position” (see FIG. 1), a release lever (not shown) releases the release means. , The clamp claw 24b rotates clockwise and the paper 45 is released.

  The switching guide 23 is controlled to rotate in the clockwise direction when the rear end of the sheet 45 passes, and to return to the initial position shown in FIG. 1 from the position shown in FIGS. The printed paper (referred to as 45A) is sucked to the lower discharge belt 42 by the lower suction fan 43 of the lower transport device 62, and the transport belt 42 rotates clockwise at a set speed so that the end face of the paper 45A is moved. Stopping immediately after contacting the bent portion 27b of the stopper 27, the paper 45A is positioned.

  When it is determined that the position corresponding to the position of the second surface 8B of the master 8 is reached by the next rotation of the plate cylinder 1, the solenoid 72 is energized, the roller roller 17 is raised, and the leading end portion is raised while raising the sheet 45A. Is released from the stopper 17a and brought into contact with the press roller 15 so that the sheet 45A is pressed and held between the press roller 15 and the roller roller 17 and is rotated at the same speed as that of the plate cylinder 1 by the rotational force of the press roller 15. The conveyance of the sheet 45A on which the image of the first surface 8A is printed is started.

  At this time, the press roller 15 is also controlled to be pressed at a position corresponding only to the second surface 8B of the master 8 by a cam device (not shown). The rising timing of the roller roller 17 is controlled so as to be an optimal timing based on the printing speed of the plate cylinder 1, the size and thickness of the paper 45, the humidity in the machine, the internal temperature of the solenoid 72, and the like.

  The sheet 45 </ b> A is guided by the curved roller guide plate 18 and conveyed toward the nip portion between the plate cylinder 1 and the press roller 15. The sheet 45 </ b> A is pressed against the plate cylinder 1 by the press roller 15, and printing is performed to fill the second surface 8 </ b> B of the master 8 with ink. The sheet 45A is peeled off from the plate cylinder 1 by a sheet discharge claw 26 and a separation fan 28 that are close to and separated from the plate cylinder 1, guided to the upper surface of the switching guide 23, and sucked and conveyed by the sheet discharge belt 21 to the sheet discharge tray 25. Discharged. Next, a predetermined number of prints are performed in the same process.

It is the figure explaining schematic structure of the stencil printing apparatus. It is a control block diagram of a stencil printing apparatus. It is the perspective view which took out and showed the roller roller, its drive means, and the paper stopper. It is the partial front view explaining the stopper and the member structure of the vicinity. FIG. 6 is a front view showing an image surface of each side of a double-sided document. It is the fragmentary front view which showed the principal part structure of the stencil printing apparatus in the middle state after starting the inversion operation | movement of a sheet | seat for 2nd surface printing after 1st surface printing in double-sided printing. It is the fragmentary front view which showed the principal part structure of the stencil printing apparatus in the middle state after starting the inversion operation | movement of a sheet | seat for 2nd surface printing after 1st surface printing in double-sided printing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Ink roller 3 Doctor roller 4 Ink reservoir 5 Ink pipe 5a Supply hole 6 Stage 7 Clamper 7a Clamper shaft 8 Master 8a Roll 8b Roll core 9 Platen roller 10 Thermal head 11 Cutter 12 Transport roller 15 Platen roller 16 Press roller arm 16a Arm shaft 17 Roller roller 18 Guide plate 19 Before discharge roller 20 After discharge roller 21 Discharge belt 22 Suction fan 24 Moving guide 24a Clamp shaft 24b Clamp claw 25 Paper discharge tray 26 Peeling claw 26a Shaft portion 27 Stopper 27a Opening portion 27b Folding Curved portion 28 Separation fan 40 Before conveyance roller 41 After conveyance roller 42 Conveyor belt 43 Under suction fan 45 Paper 50 Scanner device 50a Document table 50b Discharge table 51 Control device 52 Operation panel 60 Discharge Conveying device 62 Lower conveying device 63 Arrow 71 Roller roller arm 71a Shaft portion 73 Temperature detection sensor 80 Document 80a (original) first surface 80b (original) second surface 80A (master) first surface 80B (master) Second surface 90 Various sensors A Plate making equipment

Claims (7)

A master made by engraving is wound around a porous cylindrical plate cylinder having ink supply means and supported rotatably around its own central axis, and the paper is pressed onto the plate cylinder by pressing means, and the master A stencil printing apparatus that performs printing by making ink miserable through a perforation portion of the plate, and includes a plate making means for performing heat perforation making a master divided into two front and rear surfaces in the feeding direction, and the paper in the front and rear directions The pressing switching means for pressing each of the two surfaces and the first surface, which is one of the two front and rear surfaces, are held in a state where the printed paper is in contact with the stopper, The roller roller is displaced in accordance with the position of the second surface that is one, is brought into contact with the pressing means, the paper is sandwiched between the pressing means and the roller roller, and the paper is conveyed while being reversed. Press the paper against the cylinder with the above pressing means on both sides In the stencil printing apparatus configured to perform printing,
A stencil printing apparatus configured to control the timing of the displacement of the roller roller according to a printing speed. In the stencil printing apparatus according to claim 1,
When the printing speed is relatively fast, control is performed so that the roller roller ascending timing is advanced compared to when the printing speed is slow, and when the printing speed is relatively slow, the roller roller ascent timing is delayed compared to when it is fast. A stencil printing apparatus characterized by controlling. In the stencil printing apparatus according to claim 1 or 2,
A stencil printing apparatus configured to control the displacement timing of the roller roller according to the weight of the paper. In the stencil printing apparatus according to claim 3,
If the weight of the paper is relatively heavy, control is performed so that the rising timing of the roller roller is advanced compared to when the paper is light, and if the weight of the paper is relatively light, control is performed so that the rising timing of the roller roller is delayed compared to when the paper is heavy A stencil printing apparatus. In the stencil printing apparatus according to claim 4,
The stencil printing apparatus characterized in that the light weight is determined and controlled by factors of the size and thickness of the paper. In the stencil printing apparatus according to any one of claims 1 to 5,
The stencil printing apparatus, wherein the roller roller is driven by one or more solenoids, and the operation timing of the roller roller by the solenoid is controlled according to the internal temperature of the solenoid. In the stencil printing apparatus according to any one of claims 1 to 6,
A stencil printing apparatus configured to control an operation timing of the solenoid in accordance with an environmental humidity of a place where the stencil printing apparatus is set.

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