JP5145556B2 - Stencil printing apparatus and feeding timing adjustment method - Google Patents

Description

  The present invention relates to a stencil printing apparatus, and more particularly to adjustment of paper feeding timing.

  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.

  In the stencil printing apparatus described above, the sheet is temporarily stopped at the registration roller pair so that the plate-making image formed on the plate is printed at a predetermined position on the sheet, and then the registration roller pair rotates at a predetermined timing. Is fed to the printing section. In general, the registration roller pair is driven to rotate in a state in which the driving force of the plate cylinder driving means for rotating the plate cylinder is transmitted by a transmission means such as a gear or a cam and mechanically synchronized with the rotation of the plate cylinder. Therefore, when the paper is aligned with the plate cylinder, it is not actually printed. For example, if the paper feeding start position is adjusted when the plate cylinder is rotated to a predetermined position, the position is adjusted once. After that, the paper feeding timing becomes constant, and even if the rotation speed of the plate cylinder changes, the paper feeding start position does not change, and it is possible to visually check the paper conveyance status and adjust the alignment. And verification can be done easily.

  However, in the above-described configuration, the registration roller pair needs to be mechanically connected to the plate cylinder driving unit, so that the configuration becomes complicated and the installation space for the configuration is required, and the complexity and size of the apparatus cannot be avoided. There is a problem that the cost increases. Therefore, as a method for simplifying, downsizing, and reducing the cost of the apparatus, a configuration in which the registration roller pair is rotationally driven by an actuator such as a stepping motor or an electromagnetic clutch is disclosed in, for example, “Patent Document 1”.

JP 2000-108482 A

  However, in the above-described technique, the plate cylinder and the registration roller pair are not mechanically connected. Therefore, it is necessary to align the feeding start position while rotating the plate cylinder for each of a plurality of printing speeds. However, there is a problem that alignment cannot be performed without actually performing printing and visually confirming the printed image. If the accuracy of this alignment is low, the image position will fluctuate greatly when the printing speed is increased, and printing defects will occur.

  The present invention solves the above-described problems, and a stencil printing apparatus and a feeding start position capable of easily adjusting the feeding timing of paper even when the plate cylinder and the registration roller pair are not mechanically connected. The purpose is to provide an adjustment method.

According to the first aspect of the present invention, a printing unit having a plate cylinder and a pressing unit that presses the sheet against the plate cylinder, and a driving unit different from the plate cylinder driving unit that drives the plate cylinder are rotationally driven by the printing unit. a pair of registration rollers for feeding the paper at a predetermined timing toward, possess a sheet conveying means for conveying the sheet on which printing has been made in the printing unit, the stencil printing device for printing a plurality of print speeds, the Plate cylinder position detection means for detecting the position of the plate cylinder, paper detection means for detecting the leading edge of the paper passing on the paper transport means provided downstream of the printing unit in the paper transport direction, and the paper detection It means comprising a display means for displaying the position of said plate cylinder when detecting paper, the display means in the alignment mode of performing alignment in the transport direction of the sheet relative to the position of the plate cylinder is Serial displays the position of the plate cylinder for each printing speed, based on said display of the display unit the resist roller pair by the sheet feeding of the sheet to said printing unit by changing the timing approach position said respective printing speed per It is characterized by being adjustable .

  According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the feeding timing is further changed by changing a rotation start position of the registration roller pair.

  According to a third aspect of the present invention, in the stencil printing apparatus according to the first aspect, the feeding timing is further changed by changing a rotation speed of the registration roller pair.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to any one of the first to third aspects, the feeding timing is further changed automatically.

According to a fifth aspect of the present invention, a printing unit having a printing cylinder and a pressing unit that presses a sheet against the printing cylinder, and a driving unit different from a printing cylinder driving unit that drives the printing cylinder are rotated and driven by the printing unit. a pair of registration rollers for feeding the paper at a predetermined timing toward, possess a sheet conveying means for conveying the sheet on which printing has been made in the printing section, the paper in the stencil printing device for printing a plurality of printing speeds A feeding timing adjustment method comprising: a plate cylinder position detecting unit that detects a position of the plate cylinder; and a leading end of a sheet that passes over the sheet conveying unit provided downstream of the printing unit in a sheet conveying direction. comprising a sheet detecting means for detecting, and display means said sheet detection means for displaying the position of said plate cylinder when detecting paper, to align in the conveying direction of the sheet relative to the position of the plate cylinder position It said display means in the Align mode displays the position of the plate cylinder for each of the respective printing rate of the sheet with respect to the printing unit by changing the feeding timing of the sheet by the registration roller pair based on the display of the display means The approach position can be adjusted for each printing speed .

  According to the present invention, even if the plate cylinder and the registration roller pair are not mechanically connected, it is possible to easily adjust the sheet feeding timing to the plate cylinder for each speed, and to simplify and reduce the size of the apparatus. A good printed image can be obtained while reducing the cost and cost.

  FIG. 1 shows a stencil printing apparatus adopting an embodiment of the present invention. In FIG. 1, a stencil printing apparatus 1 includes a printing unit 2, a plate making 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 disposed almost at the center of the apparatus main body 8 includes a plate cylinder 9 and a press roller 10 as pressing means.
The plate cylinder 9 is rotatably supported by a support shaft 11 that also serves as an ink supply pipe. The plate cylinder 9 is rotatably driven by a plate cylinder driving means (not shown) and is detachable from the apparatus main body 8. An ink supply means 14 having an ink roller 12, a doctor roller 13, etc. is disposed inside the plate cylinder 9, and a clamper 15 that holds the tip of the master is attached to the outer peripheral surface of the plate cylinder 9 so as to be freely opened and closed. It has been. On the outer peripheral surface of the plate cylinder 9, there are provided openings having a large number of perforations that allow the ink supplied from the ink supply means 14 to bleed out, and the maximum printing area by the plate cylinder 9 corresponding to the area of the openings is A3. Set to size. In the vicinity of the outer peripheral surface of the plate cylinder 9, an encoder 29 is disposed as a plate cylinder position detecting means for detecting the position of the plate cylinder 9 during rotation.

  Below the plate cylinder 9, there is disposed a press roller 10 in which both ends of the support shaft are rotatably supported by a pair of arm members 16. In the press roller 10, each arm member 16 is oscillated by an oscillating means (not shown), so that a predetermined pressure contact force is applied to the separation position separated from the outer peripheral surface of the plate cylinder 9 and the outer peripheral surface of the plate cylinder 9 shown in FIG. It selectively occupies the press-contact position to press-contact with.

A plate making unit 3 is disposed in the upper right part of the apparatus main body 8. The plate making unit 3 includes a master holding member 17, a platen roller 18, a thermal head 19, a master cutting means 20, master transport roller pairs 21 and 22, and the like.
The master holding member 17 is attached to a side plate (not shown) of the apparatus main body 8, and has a core portion of a master roll 23a obtained by winding a master 23 formed by laminating a thermoplastic resin film and a porous support in a roll shape. Supports rotation and detachment.

  A platen roller 18 disposed on the left side of the master holding member 17 is rotatably supported on a side plate (not shown) of the apparatus body 8 and is driven to rotate by a stepping motor 24. A thermal head 19 positioned below the platen roller 18 and having a large number of heat generating elements is attached to a side plate (not shown) of the apparatus main body 8, and the surface of the heat generating elements is arranged around the platen roller 18 by a biasing force of a biasing means (not shown). It is pressed against the surface. The thermal head 19 selectively heats each heating element while contacting the surface of the thermoplastic resin film of the master 23, and performs hot melt perforation plate-making on the master 23.

  Master cutting means 20 is disposed on the left side of the platen roller 18 and the thermal head 19. The master cutting means 20 having a fixed blade fixed to a frame (not shown) of the apparatus main body 8 and a movable blade supported so as to be movable with respect to the fixed blade has the movable blade rotated or moved with respect to the fixed blade. The master 23 is cut by moving up and down.

  On the left side of the master cutting unit 20, a pair of master transport rollers 21 and 22 is disposed. Each of the master conveying roller pairs 21 and 22 has a driving roller and a driven roller that are rotatably supported by a side plate (not shown) of the apparatus main body 8, and each driving roller is a platen roller 18 by a driving means (not shown). The driven rollers are rotationally driven in the same direction in synchronism with each other, and the driven rollers are pressed against the corresponding driving rollers by urging means (not shown).

A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a paper feed tray 25, a paper feed roller 26, a separation roller pair 27, a registration roller pair 28, and the like.
A sheet feeding tray 25 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). A pair of side fences 30 are disposed on the upper surface of the paper feed tray 25, and each side fence 30 is moved in synchronization with each other in the paper width direction orthogonal to the paper transport direction.

  Above the left end of the paper feed tray 26, a paper feed roller 26 having a high friction resistance member on the surface is disposed. The paper feed roller 26 is rotatably supported by a bracket (not shown) that is swingably supported by the apparatus main body 8. When the paper feed tray 25 is raised by a lifting means (not shown), the paper feed roller 26 is supplied with a predetermined pressure. The uppermost sheet P on the paper tray 25 is pressed against. The paper feed roller 26 is rotationally driven by a paper feed motor 32 comprising a stepping motor.

  A separation roller pair 27 is disposed on the left side of the paper feed roller 26. The separation roller pair 27 has an upper roller and a lower roller each having a high friction resistance member on the surface, and the upper roller is rotated in the same direction in synchronism with the rotation of the paper feed roller 26 by the paper feed motor 32. 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.

  On the left side of the separation roller pair 27, a registration roller pair 28 having a driving roller 28a and a driven roller 28b is disposed. The drive roller 28a is rotatably supported between side plates (not shown) of the apparatus main body 8 and is driven to rotate by a variable speed stepping motor 31. The driven roller 28b is rotatably supported between side plates (not shown) of the apparatus body 8, and is pressed against the drive roller 28a 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 removal unit 5 includes an upper plate removal member 33, a lower plate removal member 34, a plate removal box 35, a compression plate 36, and the like.
Both the upper plate removal member 33 and the lower plate removal member 34 have a drive roller, a driven roller, an endless belt, and the like, and the endless belt moves when the drive roller is rotationally driven by a plate drive unit (not shown). Further, the lower plate discharge member 34 is configured to be movable by a moving means (not shown), and selectively occupies an initial position shown in the drawing and a peeling position where the endless belt contacts the outer peripheral surface of the plate cylinder 9.

  The plate removal box 35 for storing the used master therein is configured to be detachable from the apparatus main body 8. A compression plate 36 for pushing the used master carried by the upper plate removal member 33 and the lower plate removal member 34 into the plate release box 35 is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by a lifting means (not shown). The

A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 37, a peeling fan 38, a paper transport unit 39, a paper discharge tray 40, and the like.
The base end of the peeling claw 37 is swingably supported by the apparatus main body 8, and the free end formed in an acute angle is swung by a claw swinging means (not shown) so that the outer periphery of the plate cylinder 9 The proximity position shown in the figure close to the surface and the separation position separated from the outer peripheral surface of the plate cylinder 9 to avoid obstacles such as the clamper 15 are selectively occupied. The peeling fan 38 is disposed above the peeling claw 37 and blows air toward the free end tip of the peeling claw 37 to promote the peeling of the paper P from the plate cylinder 9.

  The sheet conveying means 39 disposed on the lower left side of the peeling claw 37 includes a driving roller, a driven roller, an endless belt, a suction fan, and the like. The driving roller is driven to rotate by a paper discharge driving means (not shown). By operating the suction fan, the sheet P is conveyed to the left while being sucked onto the endless belt. Inside the housing (not shown) of the sheet conveying means 39, a sensor 49 is disposed as a sheet detecting means for detecting when the sheet P is conveyed on the endless belt.

  A paper discharge tray 40 is disposed on the left side of the paper transport means 39. A paper discharge tray 40 on which a large number of printed paper P conveyed by the paper discharge conveying means 39 is stacked has one end fence 41 and a pair of side fences 42 for aligning the paper P on its upper surface. doing. The end fence 41 is movable in the same direction as the paper conveyance direction, and each side fence 42 is configured to be able to contact and separate from each other in the same direction as the paper width direction.

  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 43 on which a document is placed, a pressure plate 44 that can be moved toward and away from the contact glass 43, a scanning unit 45 that scans and reads a document image, a lens 46 that focuses the scanned image, and a focus. An image sensor 47 such as a CCD for processing the obtained image is provided. An ADF unit 48 used for automatically reading a plurality of documents is disposed on the pressure plate 44.

  FIG. 2 shows an operation panel of the stencil printing apparatus 1. In the figure, an operation panel 51 includes a plate making start key 52, a printing start key 53, a stop key 54, a ten key 55, a printing speed setting key 60, a display device 56 including a 7 segment LED, and a display device including an LCD as a display means. A well-known configuration such as 61 is arranged. The stencil printing apparatus 1 shown in the present embodiment is configured to be able to set any printing speed from 1st speed to 5th speed by a printing speed setting key 60.

  FIG. 3 is a block diagram of control means used in the stencil printing apparatus 1. In the figure, a control means 50 composed of a well-known microcomputer having a CPU 57, a ROM 58, a RAM 59 and the like is provided inside the apparatus main body 8. An operation signal from the operation panel 51 and detection signals from various sensors including the encoder 29 and the sensor 49 are input to the control means 50. The control means 50 receives the printing unit 2, the plate making unit 3, and the like based on the signals. The operations of the paper feed unit 4, the plate discharge unit 5, the paper discharge unit 6, the image reading unit 7, the stepping motor 31 and the like are controlled.

  The CPU 57 receives output signals from the encoder 29, sensor 49, and operation panel 51. Each input signal is arithmetically processed based on an operation program stored in the ROM 58, and the printing unit 2, the plate making unit 3, the paper feeding unit 4, the plate discharging unit 5, the paper discharging unit 6, the image reading unit 7, and the stepping motor 31 are processed. Is output as an operation signal to each of the drive circuits that control the operation, and is also output as a display signal to the operation panel 51. The ROM 58 stores a plurality of operation programs for operating the actuators of the stencil printing apparatus 1. In the RAM 59, an operation program called from the ROM 58 by the CPU 57 is temporarily written, and this operation program is rewritten by an input from the operation panel 51.

Based on the above configuration, the operation of the stencil printing apparatus 1 will be described below.
After the manuscript is placed on the contact glass 43 by the operator, when the plate making start key 52 on the operation panel 51 is pressed in a state where the pressure plate 44 is closed, the image reading unit 7 performs a manuscript image reading operation. Is called. The image is read by scanning the original image with the scanning unit 45, and the read image is focused by the lens 46 and then sent to the image sensor 47.

  In parallel with the image reading operation, the plate discharging unit 5 performs a plate discharging operation for peeling the used master from the outer peripheral surface of the plate cylinder 9. When the plate making start key is pressed, the plate cylinder 9 starts rotating, and when reaching a predetermined plate discharging position, the rotation is stopped. Then, the lower plate removal member 34 is actuated and moved to the peeling position, and the used master on the plate cylinder 9 is scooped up by the lower plate removal member 34. Thereafter, the plate cylinder 9 is rotated and the upper plate discharging member 33 is operated, and the used master on the plate cylinder 9 is conveyed by the plate discharging members 33 and 34 and stored in the plate discharging box 35. Thereafter, the compression plate 36 is operated to compress the used master in the discharge plate box 35 and the plate cylinder 9 is rotated to a predetermined plate feeding position and stopped. The clamper 15 is opened and the stencil printing apparatus 1 is fed. It becomes a plate standby state.

  When the stencil printing apparatus 1 enters a stencil supply standby state, the platen roller 18 and each of the master transport roller pairs 21 and 22 are rotationally driven, and the master 23 is pulled out from the master roll 23a. The drawn master is punched when passing through the thermal head 19, and a plate-making image is formed on the surface of the thermoplastic resin film. The master 23 is sent to the clamper 15 while making a plate, and when the control means 50 determines that the tip of the master 23 has been conveyed to a position that can be held by the clamper 15 based on the number of steps of the stepping motor 24, the clamper 15 is closed and the plate is made. The master 23 is held on the outer peripheral surface of the plate cylinder 9 at the tip.

  Thereafter, the plate cylinder 9 is rotationally driven at the same peripheral speed as the conveying speed of the master 23, and the winding operation of the master 23 around the plate cylinder 9 is performed. When the master 23 for one plate is made, the operations of the platen roller 18 and each of the master conveying rollers 21 and 22 are stopped and the master cutting means 20 is operated to cut the master 23. The cut master 23 is pulled out from the plate making section 3 by the rotation of the plate cylinder 9, and the plate cylinder 9 rotates to the home position and stops, whereby the plate making operation and the plate feeding operation are completed.

  The printing operation is performed following the plate feeding operation. When the plate cylinder 9 is stopped at the home position, the sheet feeding unit 4 is operated to pull out the uppermost sheet P from the sheet feed tray 25, and the leading end of the sheet cylinder 9 is sandwiched between the registration roller pair 28 and the plate cylinder. 9 is driven to rotate in the clockwise direction in FIG. 1 at a low speed (lower than the first speed during printing). Then, the stepping motor 31 is rotated at a predetermined timing when the leading end of the image area of the master 23 wound around the plate cylinder 9 reaches the contact portion with the press roller 10 in the plate cylinder rotation direction, and the drive roller 28a is rotationally driven. Then, the paper P is fed toward the contact portion between the plate cylinder 9 and the press roller 10. Almost simultaneously with the rotation of the drive roller 28a, the press roller 10 presses the peripheral surface thereof against the outer peripheral surface of the plate cylinder 9 by the operation of a swinging means (not shown), and the fed paper P presses against the master 23 on the plate cylinder 9. Is done. By this pressing operation, the press roller 10, the paper P, the master 23, and the plate cylinder 9 are pressed against each other, and the ink supplied to the inner peripheral surface of the plate cylinder 9 by the ink roller 12 oozes out from the opening portion of the plate cylinder 9, After being filled in the porous support of the master 23, it is transferred to the paper P through the perforated part of the master 23, and so-called printing is performed.

  The sheet P on which the image has been transferred by the printing is peeled off from the outer peripheral surface of the plate cylinder 9 by the peeling claw 37 and the peeling fan 38, dropped downward and sent to the sheet conveying means 39, and then the sheet conveying means. The sheet is sucked and conveyed by the sheet 39 and discharged onto the sheet discharge tray 40. Thereafter, the plate cylinder 9 rotates again to the home position and stops, and the stencil printing apparatus 1 enters a printing standby state after finishing the plate attaching operation.

  After the stencil printing apparatus 1 enters the print standby state, when the number of prints is set by the ten key 55 on the operation panel 51 and the print speed is set by the print speed setting key 60, the print start key 53 is pressed. Then, the sheet P is continuously fed from the sheet feeding unit 4 and the printing operation is performed. When the set number of prints is consumed, the plate cylinder 9 stops at the home position, and the stencil printing apparatus 1 enters the print standby state again.

  In the stencil printing apparatus 1 described above, the driving roller 28a of the registration roller pair 28 is rotationally driven by a stepping motor 31 that is different from a plate cylinder driving means (not shown) that rotationally drives the plate cylinder 9. It is necessary to align the plate-making image position of the master 23 wound around the paper P and the paper P fed to the printing unit 2 by the registration roller pair 28. This is performed at the time of initial setting before shipment from the factory, and this alignment mode (hereinafter referred to as alignment mode) is changed by pressing predetermined keys on the operation panel 51 in a predetermined order. It is configured.

  After the stencil printing apparatus 1 enters the alignment mode, when the paper P is placed on the paper feed tray 25 and the plate making start key 52 is pressed, the plate cylinder 9 rotates and the plate discharging unit 5 as described above. Is operated and the sheet covering the outer peripheral surface of the plate cylinder 9 or the master 23 is peeled off, the plate cylinder 9 stops at the plate supply standby position shown in FIG. Thereafter, the plate cylinder 9 rotates and the plate making unit 3 operates in the same manner as described above, and the master 23 on which a predetermined image is made is wound on the outer peripheral surface of the plate cylinder 9.

  When the winding operation is completed, the plate cylinder 9 starts to rotate at the same speed as the above-described plate attachment, and one sheet P is fed from the sheet feeding unit 4. After the fed paper P is temporarily stopped by the registration roller pair 28, the stepping motor 31 is operated at the timing stored in advance in the ROM 58 and the driving roller 28a is rotated to feed the paper P toward the printing unit 2. Sent. The paper P fed to the printing unit 2 is pressed by the press roller 10 against the master 23 on the outer peripheral surface of the plate cylinder 9 to transfer the image, and then the peeling nail 37 and the peeling fan 38 remove the plate P from the plate cylinder 9. The paper is peeled off from the outer peripheral surface and sent to the paper transport means 39.

  The leading edge of the paper P sent to the paper transport means 39 is detected by the sensor 49, and a detection signal for the paper P is output from the sensor 49 toward the control means 50, and the plate is sent from the encoder 29 toward the control means 50. A position signal of the cylinder 9 is output. The control means 50 compares the detection signal of the sheet P and the position signal of the plate cylinder 9, and the plate-making image position of the master 23 in which the sheet P is wound around the predetermined position of the plate cylinder 9, that is, the outer peripheral surface of the plate cylinder 9. It is determined how far or behind the position suitable for the position is stored, and this is stored in the RAM 59. The paper P transported by the paper transport means 39 is discharged onto the paper discharge tray 40.

  After the positional relationship between the paper P and the plate cylinder 9 at the printing speed is stored in the control means 50, the printing start key 53 is set after the printing speed is set to the first speed by the printing speed setting key 60 in the alignment mode. When pressed, the rotational peripheral speed of the plate cylinder 9 is set to a first speed higher than that at the time of printing, and the same printing operation as described above is performed. During this printing operation, the paper P is detected by the sensor 49 on the paper transport means 39 and the position signal of the plate cylinder 9 is output from the encoder 29 to the control means 50. The positional relationship with the plate cylinder 9 is stored in the control means 50. Thereafter, the printing operation is similarly performed from the second speed to the fifth speed, and the positional relationship between the paper P and the plate cylinder 9 at the printing speed from the second speed to the fifth speed is stored in the control unit 50, respectively.

  When the printing operation at each speed is completed, the delay amount or advance amount of the paper P at each speed is displayed on the LCD display 61, and the operator inputs a numerical value corresponding to the deviation amount for each speed to input the paper P and the plate cylinder. 9 is adjusted for each speed. For example, as shown in FIG. 4, when the standard (N) at which the stepping motor 31 starts rotating at the printing speed is 14 pulses, when the display on the LCD display device 61 is “+3”, 3 pulses. Since it is delayed by a minute, “11” is input to speed up the start of rotation of the stepping motor 31. Conversely, when the display is “−5”, it arrives earlier by five pulses, so “19” is input. . Here, the signs indicating the advance and the delay may be displayed in reverse so as not to make a mistake. By inputting this corresponding to each speed, the position adjustment between the paper P and the plate cylinder 9 at the full speed of the stencil printing apparatus 1 is completed. After the position adjustment is completed, by pressing predetermined keys on the operation panel 51 in a predetermined order, the stencil printing apparatus 1 exits the alignment mode and enters a plate making standby state.

  With the above-described configuration, even if the plate cylinder 9 and the registration roller pair 28 are not mechanically connected, the feeding timing adjustment of the paper P with respect to the plate cylinder 9 can be easily performed at each speed, thereby simplifying the apparatus. A good print image can be obtained while reducing the size, size and cost. In the above-described configuration, the sensor 49 is disposed at a position where the conveyance speed of the paper P becomes constant by being sandwiched between the plate cylinder 9 and the press roller 10, and thus the accuracy of adjusting the feeding timing of the paper P is improved. Can be improved. When the sensor 49 is arranged on the upstream side in the paper conveyance direction from the position where the paper P is sandwiched between the plate cylinder 9 and the press roller 10, the registration roller pair 28 is conveyed on the downstream side in the paper conveyance direction for each printing speed. Since the variation of the acceleration of the sheet P to be produced occurs, the adjustment accuracy deteriorates.

  In the embodiment described above, the stepping motor 31 is rotationally driven after a predetermined pulse has elapsed based on the number of pulses of the plate cylinder 9, but as shown in FIG. 5, the stepping motor 31 is rotationally driven using an on-delay timer or the like. It is good also as a structure which controls timing. Further, instead of the configuration for controlling the rotational drive timing of the stepping motor 31, the rotational peripheral speed of the stepping motor 31 is changed as shown in FIG. 6, and the sheet P is transferred from the registration roller pair 28 to the plate cylinder 9 and the press roller 10. You may employ | adopt the structure which changes the timing until it supplies to the press-contact part.

  Further, in the above-described embodiment, the positional relationship between the paper P and the plate cylinder 9 for each speed is manually adjusted for each speed. However, the CPU 57 of the control unit 50 sets the delay amount and the advance amount for each speed. It is good also as a structure which calculates every time and the control means 50 changes automatically the rotational drive timing or rotational peripheral speed of the stepping motor 31. FIG. As a result, the positional relationship between the paper P and the plate cylinder 9 can be easily adjusted without fail.

  Further, in the above embodiment, the paper P and the plate cylinder 9 are aligned in the alignment mode at the time of initial setting before shipment from the factory. However, the control unit 50 can store the number of printed sheets and can store a predetermined number (for example, 1 million). A configuration in which a display for prompting adjustment for each sheet is performed on the LCD display device 61, or a configuration in which the adjustment is automatically performed, a sensor capable of measuring environmental temperature is used, or a predetermined temperature (for example, 30 ° C.) A configuration in which a display for prompting adjustment on the LCD display device 61 in the case of the following or a configuration in which adjustment is automatically performed may be employed. Thus, in the former case, even if the position of the paper P is shifted due to wear of each roller or the like, the positions of the paper P and the plate cylinder 9 can be matched, and in the latter, each roller or the like changes its temperature to change the paper. Even if the position of P is shifted, the positions of the paper P and the plate cylinder 9 can be matched.

1 is a schematic front view of a stencil printing apparatus to which an embodiment of the present invention can be applied. It is the schematic of the operation panel 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 for demonstrating position adjustment of the paper and plate cylinder in one Embodiment of this invention. It is the schematic for demonstrating position adjustment of the paper and plate cylinder in one Embodiment of this invention. It is the schematic for demonstrating position adjustment of the paper and plate cylinder in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 2 Printing part 9 Plate cylinder 10 Pressing means (press roller)
28 Registration roller pair 29 Plate cylinder position detecting means (encoder)
39 Paper transport means 49 Paper detection means (sensor)
61 Display means (LCD display device)
P paper

Claims (5)

A printing unit having a printing cylinder and a pressing unit that presses the sheet against the printing cylinder, and a driving unit that is different from the plate cylinder driving unit that drives the printing cylinder, and is rotated at a predetermined timing toward the printing unit. a pair of registration rollers for feeding, possess a sheet conveying means for conveying the sheet on which printing has been made in the printing unit, the stencil printing device for printing a plurality of print speeds,
Plate cylinder position detection means for detecting the position of the plate cylinder, paper detection means for detecting the leading edge of the paper passing over the paper transport means provided downstream of the printing unit in the paper transport direction, and the paper Display means for displaying the position of the plate cylinder when the detection means detects the paper, and the display means in the alignment mode for aligning the position of the plate cylinder in the paper transport direction. The position of the plate cylinder is displayed for each printing speed, and the paper feeding timing by the pair of registration rollers is changed based on the display on the display means so that the paper entry position with respect to the printing unit is changed for each printing speed. A stencil printing apparatus, characterized in that it is adjustable . In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the feeding timing is changed by changing a rotation start position of the registration roller pair. In the stencil printing apparatus according to claim 1,
The stencil printing apparatus, wherein the feeding timing is changed by changing a rotation speed of the registration roller pair. In the stencil printing apparatus according to any one of claims 1 to 3,
A stencil printing apparatus, wherein the feeding timing is automatically changed. A printing unit having a printing cylinder and a pressing unit that presses the sheet against the printing cylinder, and a driving unit that is different from the plate cylinder driving unit that drives the printing cylinder, and is rotated at a predetermined timing toward the printing unit. a pair of registration rollers for feeding, possess a sheet conveying means for conveying the sheet on which printing has been made in the printing unit, a feeding timing adjustment method of a sheet in the stencil printing device for printing a plurality of printing speeds ,
Plate cylinder position detection means for detecting the position of the plate cylinder, paper detection means for detecting the leading edge of the paper passing over the paper transport means provided downstream of the printing unit in the paper transport direction, and the paper Display means for displaying the position of the plate cylinder when the detection means detects the paper, and the display means in the alignment mode for aligning the position of the plate cylinder in the paper transport direction. The position of the plate cylinder is displayed for each printing speed, and the paper feeding timing by the pair of registration rollers is changed based on the display on the display means so that the paper entry position with respect to the printing unit is changed for each printing speed. The sheet feeding timing adjustment method, wherein the sheet feeding timing is adjustable.

Images