JP2019098612A - Stencil printing apparatus - Google Patents

Abstract

To enable suppression of an increase in printing time associated with oblique adjustment of a printing image printed on a sheet, and avoidance of deterioration in image quality, in a stencil printing apparatus.SOLUTION: A stencil printing apparatus 1 comprises: a cylindrical plate cylinder 41a around which a stencil sheet S is wound; a plate mounting seat 41e which is disposed at a part of an outer peripheral surface of the plate cylinder 41a in a circumferential direction and extends in parallel with an axial direction D3 of the plate cylinder 41a; a clamp plate 41b for clamping the stencil sheet S with the plate mounting seat 41e; and an adjustment mechanism 95 for adjusting the height of the plate mounting seat 41e in a radial direction D4 of the plate cylinder 41a.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a stencil printing apparatus.

  Conventionally, in a stencil printing apparatus, a stencil sheet (master) on which heat-sensitive perforations have been applied in a plate making section is rotated with a printing cylinder in a state of being wound around a cylindrical printing cylinder (printed), and the sheet is It is conveyed in the tangential direction of the plate cylinder. Further, when the sheet is pressed against the stencil sheet by the press roller, the ink exuded from the inside of the plate cylinder is transferred to the sheet through the stencil sheet.

  In the stencil printing apparatus, the stencil sheet may be wound around the printing drum obliquely with respect to the circumferential direction of the printing drum because the plate-making section and the printing drum are not parallel to each other. Thus, when the stencil sheet is obliquely wound on the plate cylinder, the printed image printed on the sheet is also inclined.

  There is provided a stencil printing apparatus which moves an ink-passing member forming an outer peripheral surface of a plate cylinder in an oblique direction which is not parallel to both the axial direction and the circumferential direction of the plate cylinder in order to prevent the printed image from being oblique. It is proposed (for example, refer patent document 1).

  Further, there has been proposed a stencil printing apparatus which performs correction for rotating image data in order to prevent the print image from being inclined (for example, see Patent Document 2).

Patent No. 3691314 JP 2014-159116 A

  As described above, the stencil printing apparatus for moving the ink-passing member in the oblique direction peels the stencil sheet from the plate cylinder and stores it in the plate-removal part in order to move the ink-permeable member so as to twist it in the rotational direction of the plate cylinder. There are cases where it is not possible to properly perform the plate discharge processing. Therefore, in this stencil printing apparatus, it is necessary to control the ink passing member to return to the home position, which is the initial setting position, every time before the plate discharging process. Furthermore, it is also necessary to perform control to move the ink passing member in the oblique direction again after the plate discharge. Therefore, the first print time (the time from when the user presses the platemaking start key on the operation panel unit of the stencil printing apparatus to when the first sheet is discharged) is always long.

  Further, in the stencil printing apparatus which performs correction for rotating image data as described above, since the print image of the sheet is prevented from being skewed by the correction of the image data, the deterioration of the image quality should be avoided. Can not.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stencil printing apparatus capable of suppressing an increase in printing time accompanying oblique adjustment of a print image to be printed on a sheet and avoiding deterioration of image quality.

  In one aspect, the stencil printing apparatus is provided with a cylindrical plate cylinder around which a stencil sheet is wound, and a plate mounting which is disposed in a part of the circumferential direction of the outer peripheral surface of the plate cylinder and extends parallel to the axial direction of the plate cylinder. And a clamp plate for clamping the stencil sheet between the seat and the plate mount, and an adjusting mechanism for adjusting the height of the plate mount in the radial direction of the plate cylinder.

  According to the aspect, it is possible to suppress an increase in printing time associated with the oblique adjustment of a print image to be printed on a sheet, and to prevent deterioration of image quality.

It is a block diagram which shows a stencil printing apparatus. It is a block diagram which shows the control structure of a stencil printing apparatus. It is a perspective view which shows the clamp board etc. of a 1st printing part (2nd printing part). It is a right side view for explaining an adjustment mechanism. It is a right side view for demonstrating the state to which the stencil sheet was clamped diagonally. It is a right side view for explaining height adjustment of a plate attachment seat by an adjustment mechanism. It is a front view which shows typically the stencil sheet clamped by the clamp board. FIG. 6 is a front view schematically showing a stencil sheet that has been flipped up by a flip-up plate.

  Hereinafter, a stencil printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a stencil printing apparatus 1.
As shown in FIG. 1, the stencil printing apparatus 1 includes an apparatus housing 2, an image reading unit 10, a plate making unit 20, a pair of guide members 31 and 32, a first printing unit 41, and a second printing unit. A printing unit 42, a first plate discharging unit 51, a second plate discharging unit 52, a sheet feeding unit 60, a reversing unit 70, and a sheet discharging unit 80 are provided.

  The image reading unit 10 has a scanner that reads image information from one side (front side) or both sides (front side and back side) of the document, and is disposed on the top of the apparatus housing 2.

  The plate making unit 20 includes a base paper storage unit 21, a thermal head 22, a platen roller 23, a base paper feed roller 24, and a base paper cutter 25, and thermally perforated the stencil sheet S.

The original paper container 21 accommodates the stencil sheet S wound in a roll shape.
The thermal head 22 performs heat-sensitive perforation on the stencil sheet S based on, for example, the image information read by the document reading unit 10.

The platen roller 23 sandwiches the stencil sheet S with the thermal head 22.
The raw paper feed roller 24 conveys the stencil sheet S subjected to the heat sensitive perforation.

  The sheet cutter 25 cuts the stencil sheet S conveyed by the sheet feed roller 24 one by one.

  Although not shown, the plate making unit 20 has a pair of drive rollers and a pair or a plurality of driven rollers, and can move in the movement direction D1 along the pair of guide members 31 and 32 by driving of the motor. As a result, the plate making unit 20 moves to the position for supplying the stencil sheet S subjected to the heat sensitive perforation to the first printing unit 41 described later and the position for supplying the stencil sheet S to the second printing unit 42. Further, the plate making unit 20 may have a pinion gear that meshes with a rack gear provided on the pair of guide members 31 and 32.

  FIG. 3 is a perspective view showing the clamp plate 41b (42b) and the like of the first printing unit 41 (second printing unit 42).

  FIG. 4 is a right side view for explaining the adjustment mechanism 95 disposed in the first printing unit 41 (second printing unit 42).

  In addition, since the first printing unit 41 and the second printing unit 42 can have the same configuration, in FIGS. 3 and 4 and FIGS. 5 to 8 described later, the first printing unit 41 can be used. The reference numeral of the second printing unit 42 is attached in parentheses after the reference numeral, and the first printing unit 41 will be described below as an example.

  As shown in FIG. 3, the first printing unit 41 includes a plate cylinder 41a, a clamp plate 41b, a press roller 41c (see FIG. 1), a conveyance belt 41d (see FIG. 1), and a plate attachment seat 41e. , A magnet plate 41f (see FIG. 4), a flip-up plate 41g, and a spacer 41h (see FIG. 4).

  In the second printing unit 42, as shown in FIG. 1, a quaternary paper feed roller 42d is disposed instead of the secondary paper feed roller 63. Further, the second printing unit 42 does not have the conveyance belt 41 d of the first printing unit 41.

  The conveyance belt 41 d of the first printing unit 41 conveys the sheet P on which printing is performed in the first printing unit 41 to the reversing unit 70. The fourth sheet feeding roller 42 d of the second printing unit 42 conveys the sheet P reversed by the reversing unit 70 described later between the plate cylinder 42 a and the press roller 42 c.

  The plate cylinder 41a has a cylindrical shape, and the stencil sheet S is wound around it. Also, the plate cylinder 41a rotates counterclockwise in FIG.

  The clamp plate 41 b is disposed on the outer peripheral surface of the plate cylinder 41 a and clamps the leading end of the stencil sheet S. The clamp plate 41b moves to a position for clamping the stencil sheet S and a position for releasing the clamp of the stencil sheet S by a cam mechanism (not shown) disposed on the back side of the stencil printing apparatus 1 of the plate cylinder 41a, for example. . The clamp plate 41b is rotatably supported by a plate mounting seat 41e described later or a member to which the plate mounting seat 41e is fixed, so that the clamp plate 41b moves so as to follow the height adjustment of the plate mounting seat 41e described later. It is desirable to do.

  The press roller 41c shown in FIG. 1 is disposed below the plate cylinder 41a and is retracted downward from the press position (see FIG. 1) to press the sheet P toward the plate cylinder 41a (the stencil sheet S). Move to the retracted position.

  The plate mounting seat 41e is disposed on a part of the circumferential direction D2 of the outer peripheral surface of the plate cylinder 41a (for example, the upper portion of the plate cylinder 41a when the plate cylinder 41a stops rotating) parallel to the axial direction D3 of the plate cylinder 41a. Extend.

  The magnet plate 41f shown in FIG. 4 is disposed on the top of the plate mounting seat 41e. The clamp plate 41b is made of metal, for example, and firmly clamps the stencil sheet S inserted between the clamp plate 41b and the magnet plate 41f by magnetic force. However, the magnet plate 41f can be omitted, for example, when the clamp plate 41b clamps the stencil sheet S without using the magnetic force.

  A flip-up plate 41g shown in FIG. 3 flips the stencil sheet S from the plate cylinder 41a. The flip-up plate 41g is, for example, a position to be under the stencil sheet S as shown in FIG. 3 by a cam mechanism (not shown) disposed on the back side of the stencil printing apparatus 1 of the plate cylinder 41a as described above. The stencil sheet S is moved to a position where it is lifted up.

  A spacer 41 h shown in FIG. 4 is disposed between the plate cylinder 41 a and the plate mounting seat 41 e on the back side of the stencil printing apparatus 1. The spacer 41 h is, for example, an elastic body such as rubber.

  The adjustment mechanism 95 includes an adjustment motor 95a, a feed screw 95b, a shaft support 95c, and a power transmission gear 95d, and adjusts the height of the plate attachment seat 41e in the radial direction D4 of the plate cylinder 41a. Incidentally, the adjustment mechanism 95 prevents the plate cylinder 41 a from interfering with the above-described cam mechanism itself, and the influence on the clamp operation or release operation of the clamp plate 41 b by the cam mechanism or the bounce operation of the flip-up plate 41 g. In the axial direction D3, the cam mechanism is disposed on the front side of the plate mounting seat 41e opposite to the back side of the plate mounting seat 41e. However, if the adjustment mechanism 95 can be disposed only on both the front and back sides of the plate mounting seat 41e in the axial direction D3 of the plate cylinder 41a or on the back side of the plate mounting seat 41e on which the cam mechanism is disposed. , May be arranged.

  The adjustment motor 95a is, for example, a pulse motor, and meshes with the power transmission gear 95d in a gear provided on the output shaft 95a-1. The adjustment motor 95a is an example of adjustment drive means (adjustment actuator).

  The feed screw 95b is disposed to penetrate the plate mounting seat 41e in the radial direction D4 of the plate cylinder 41a. The plate mounting seat 41e is formed with a female screw into which the male screw of the feed screw 95b is screwed. Therefore, the height of the plate mounting seat 41e in the radial direction D4 of the plate cylinder 41a is adjusted by rotation of the feed screw 95b.

  The pivotal support portion 95c has two surfaces positioned to sandwich one end of the plate mounting seat 41e in the axial direction D3 of the plate cylinder 41a, and a surface connecting these two surfaces, for example, a U-shape in the horizontal direction It has a plate shape. The bearing 95c is provided with a bearing for rotatably supporting the feed screw 95b at each of two parts penetrated by the feed screw 95b.

  The power transmission gear 95d is provided coaxially with the feed screw 95b, and rotates integrally with the feed screw 95b. The power transmission gear 95d transmits the power of the adjustment motor 95a to the feed screw 95b by meshing with the gear of the output shaft 95a-1 of the adjustment motor 95a as described above.

  Here, since the plate cylinder 41a is rotated at the time of printing and plate discharge, the adjustment motor 95a is for moving the motor shown in FIG. 2 in order to avoid interference with the power transmission gear 95d accompanying the rotation of the plate cylinder 41a. The solenoid 96 moves to an adjustment position at the time of adjustment shown by a solid line in FIG. 4 and a retracted position shown by a dotted line in FIG. 4 retracted from the adjustment position. The motor movement solenoid 96 is an example of an adjustment mechanism movement drive unit (adjustment mechanism movement actuator).

  In the present embodiment, the stencil printing apparatus 1 includes a total of two plate cylinders 41a and 42a disposed in each of the first printing unit 41 and the second printing unit 42, and a total of two adjustment mechanisms 95 and 95. However, the plate cylinders 41a and 42a and the adjusting mechanisms 95 and 95 may be disposed only one by one or three or more. When the printing drums 41a and 42a and the adjustment mechanisms 95 and 95 are disposed only one by one, the plate making unit 20 does not have to move along the pair of guide members 31 and 32, so the pair of guide members 31 and 32 does not need to be moved. Is optional.

  Returning to FIG. 1, the first plate discharge unit 51 peels off the stencil sheet S which has been released from the outer peripheral surface of the plate cylinder 41a of the first printing unit 41 by the clamp plate 41b and lifted up by the bounce plate 41g. , Accommodates the peeled stencil sheet S. Similarly, the second plate discharge unit 52 pulls off the stencil sheet S lifted up by the flip-up plate 42g from the outer peripheral surface of the plate cylinder 42a of the second printing unit 42 by releasing the clamp by the clamp plate 42b. The peeled stencil sheet S is accommodated.

  The sheet feeding section 60 includes a sheet feeding table 61 on which the sheets P are stacked, a primary sheet feeding roller 62 for conveying the sheet P located at the top from the sheet feeding table 61, and the primary sheet feeding roller 62. A pair of secondary paper feed rollers 63 for transporting the transported paper P between the plate cylinder 41 a of the first printing unit 41 and the press roller 41 c is provided.

  The reversing unit 70 includes a reversing belt 71, auxiliary members 72, rollers 73 and 74, a suction unit 75, a mounting table 76, an intermediate conveyance belt 77, a suction unit 78, and a tertiary sheet feeding roller 79. Have.

  The reversing belt 71 has a semi-cylindrical shape by being bridged between a semi-cylindrical auxiliary member 72 and two rollers 73 and 74, one of which is a driving roller, and printing on one side is performed in the first printing unit 41 Transport the broken sheet P; The two rollers 73 and 74 are disposed in parallel with the central axis of the auxiliary member 72, and are located in the vicinity of the upper and lower ends of the planar portion (left surface in FIG. 1) of the auxiliary member 72. The suction unit 75 is disposed inside the reversing belt 71 and sucks the sheet P toward the reversing belt 71.

  The suction unit 75 sucks the back side of the sheet P conveyed above the reverse belt 71 where printing is not performed, and the reverse belt 71 conveys the sheet P while rotating clockwise in FIG. 1. The paper P is turned upside down on the mounting table 76.

  A plurality of sheets P can be stacked on the mounting table 76. The paper P on which printing has been performed on one side (front side) in the first printing unit 41 temporarily stays on the mounting table 76, whereby the drying time of the ink is secured.

  The intermediate conveyance belt 77 is formed in a porous structure, and conveys the sheets P one by one in order from the sheet P at the lowermost portion of the mounting table 76 sucked by the suction unit 78 disposed inside.

  The pair of tertiary sheet feeding rollers 79 conveys the sheet P conveyed by the intermediate conveyance belt 77 toward the second printing unit 42.

  Although the reversing unit 70 is disposed to perform double-sided printing on the sheet P using the first printing unit 41 and the second printing unit 42, the first printing unit 41 and the second printing unit 42 are provided. Stores ink bottles of different colors, and when two-color printing is performed on the same side of the sheet P, the sheet from the first printing unit 41 to the second printing unit 42 without passing through the reversing unit 70 P will be transported directly.

  The paper discharge unit 80 has a paper discharge belt 81 for conveying the paper P printed by the second printing unit 42, and a paper discharge stand 82 on which the paper P is stacked.

  As shown in FIG. 2, the stencil printing apparatus 1 further includes a control unit 91, a read only memory (ROM) 92, a random access memory (RAM) 93, and an operation panel unit 94.

  The control unit 91 has a processor (for example, CPU: Central Processing Unit) that functions as an arithmetic processing unit that controls the operation of the whole stencil printing apparatus 1. The control unit 91 reads out and executes a control program for the stencil printing apparatus 1.

  The ROM 92 is, for example, a read only semiconductor memory in which a predetermined control program is recorded in advance. Note that as the ROM 92, a memory such as a flash memory in which stored data is nonvolatile with respect to stop of power supply may be used.

  The RAM 93 is, for example, a writable and readable semiconductor memory that can be used as a working storage area as needed when the control unit 91 executes various control programs.

  The operation panel unit 94 is disposed, for example, on the top of the device housing 2. The operation panel unit 94 functions as an input unit of the stencil printing apparatus 1 by having operation keys for performing various operations of the stencil printing apparatus 1, a touch panel, and the like.

  As an example of the flow of processing of the stencil printing apparatus 1, the plate making start key is pressed by the operation of the user on the operation panel unit 94, and the plate making unit 20 is a stencil sheet S for one plate cylinder 41 a (or plate cylinder 42 a). Is moved to the position where the first plate discharge unit 51 (or the second plate discharge unit 52) performs plate discharge processing, the image reading unit 10 reads the image information, and the plate making unit 20 performs the plate making process (thermal perforation , And the stencil sheet S is printed by the plate cylinder 41a (or plate cylinder 42a).

  At the time of double-sided printing or two-color printing, thereafter, the plate making unit 20 is further moved to the position where the stencil sheet S is supplied to the other plate cylinder 42a (or plate cylinder 41a), and the second plate discharge unit 52 (or The first plate discharging unit 51) performs a plate discharging process, the plate making unit 20 performs a plate making process, and the stencil sheet S is printed by the plate cylinder 41a (or the plate cylinder 42a).

  Then, the sheet P is fed from the sheet feeding unit 60, printed in at least one of the first printing unit 41 and the second printing unit 42, and discharged to the paper discharging unit 80.

FIG. 5 is a right side view for explaining a state in which the stencil sheet S is obliquely clamped.
FIG. 6 is a right side view for explaining the height adjustment of the plate mount 41e (42e) by the adjustment mechanism 95. As shown in FIG.

  As shown in FIG. 5, an example in which the stencil sheet S (θ) is wound around the printing drum 41a at an angle θ with respect to the circumferential direction D2 of the outer peripheral surface of the printing drum 41a will be considered. In this case, the user sees and recognizes, for example, the sheet P that the print image printed on the sheet P is oblique. When multi-color printing is performed on the same side of the sheet P in the stencil printing apparatus 1 including the plurality of plate cylinders 41a and 42a, it is easy to recognize that the printed image is inclined due to the occurrence of the deviation of each color.

  In one example, the user sets the adjustment amount while looking at the adjustment amount setting screen of the adjustment mechanism 95 displayed on the operation panel unit 94 by the control unit 91. The control unit 91 controls the adjustment amount of at least one adjustment mechanism 95 of the first printing unit 41 and the second printing unit 42 based on the adjustment amount set by the user. The height adjustment of the plate mounts 41e and 42e based on the control of the adjustment mechanisms 95 and 95 by the control unit 91 is performed by the plate cylinders 41a and 42a between after the plate discharge process of the stencil sheet S and before the plate setting process. It may be performed when at the home position which is a position to stop the rotation.

  Even if a sensor for detecting the inclination of the stencil sheet S in the printing drums 41a and 42a and a sensor for detecting the inclination between the plate making unit 20 and the printing drums 41a and 42a are disposed in the stencil printing apparatus 1 Good. In this case, when it is detected by the tilt sensor that the stencil sheet S is wound obliquely around the printing drums 41a and 42a, the control unit 91 determines the adjustment mechanism 95 or 95 based on the detection result of the tilt detection sensor. The adjustment amount may be controlled.

  In the example of FIG. 5, the stencil sheet S (θ) is inclined at an angle θ so as to be away from the adjustment mechanism 95 in the axial direction D3 from one end clamped to the clamp plate 41b to the other end. Therefore, the control unit 91 controls the adjustment mechanism 95 so as to increase the height of the plate attachment seat 41e in the radial direction D4 of the plate cylinder 41a. Specifically, the control unit 91 performs drive control of the adjustment motor 95a, and as described above, the power of the adjustment motor 95a is transmitted to the feed screw 95b via the power transmission gear 95d, and the feed screw 95b rotates. By moving, the height of the plate mounting seat 41e is increased.

  Thereby, as shown in FIG. 5, the inclination of the stencil sheet S (θ) is canceled by an angle θ with respect to the circumferential direction D2 of the outer peripheral surface of the plate cylinder 41a as in the stencil sheet S shown in FIG.

  FIG. 7 is a front view schematically showing the stencil sheet S clamped by the clamp plate 41b (42b).

  FIG. 8 is a front view schematically showing the stencil sheet S flipped up by the flipping plate 41g (42g).

  By the way, when the stencil sheet S is wound around the plate cylinder 41b for a predetermined period such as one month, the stencil sheet S has a magnet plate 41f and a clamp due to the adhesive force of the oil component of the ink permeating from the plate cylinder 41a. By sticking to any part of the first printing unit 41 such as the plate 41b and the plate cylinder 41a, the stencil sheet S can not be pulled off from the plate cylinder 41a even if the flipping plate 41g performs the flipping operation. Discarding may be difficult.

  Therefore, when the state in which the stencil sheet S is wound around the plate cylinder 41a continues for a predetermined period, the control unit 91 mounts the adjustment mechanism 95 before the flip-up plate 41g bounces the stencil sheet S from the plate cylinder 41a. By controlling the adjustment mechanism 95 so as to lower the height of the seat 41e (for example, to the lower limit position), it is preferable to increase the amount of bounce by the bounce of the bounce plate 41g.

  For example, the stencil sheet S clamped by the clamp plate 41b as shown in FIG. 7 is controlled by the control mechanism 91 so that the height of the plate attachment seat 41e is reduced by .DELTA.h, as shown in FIG. The adjustment position side (the adjustment mechanism 95 side) in the plate attachment seat 41e together with the magnet plate 41f disposed on the top of the plate attachment seat 41e as shown in FIG. At the end of), it will be clamped at a low position Δh.

  Therefore, when the height of the flip-up plate 41g at the time of flip-up is constant, the height direction of the stencil sheet S by the flip-up of the flip-up plate 41g (the radial direction D4 of the plate cylinder 41a shown in FIGS. 4 to 6) The displacement of the plate is the height h before the adjustment shown in FIG. 8 (a), but when the stencil sheet S is at the position where .DELTA.h is low as shown in FIG. 8 (b), the adjustment at the plate attachment seat 41e At the end on the position side (adjusting mechanism 95 side), the height is h + Δh. As a result, compared to before adjustment shown in FIG. 8A, the stencil sheet S can be easily peeled off even when the stencil sheet S has a sticking portion Sa to any part of the first printing unit 41. . Therefore, it becomes easy to release the stencil sheet S.

  The control unit 91 determines whether or not the state in which the stencil sheet S is wound around the plate cylinder 41a continues for a predetermined period, for example, based on the elapsed time since the sheet P is discharged to the sheet discharge tray 82. can do. However, at the start of the predetermined period, the clamp unit 41b applies the stencil sheet S to the plate cylinder 41a from the start of the thermosensitive perforation of the stencil sheet S (for example, when the control unit 91 performs the process of starting the operation of the plate making unit 20). It may be other timing such as any stage before fixing one end.

  In addition, the control unit 91 may control the adjusting mechanism 95 so as to lower the height of the plate attachment seat 41e as the period in which the stencil sheet S is wound around the plate cylinder 41a is longer. In addition, the control unit 91 may change the predetermined period according to, for example, the setting of the user of the operation panel unit 94 or the administrator of the stencil printing apparatus 1.

  In the embodiment described above, the stencil printing apparatus 1 is disposed in a part of the circumferential direction D2 of the cylindrical printing drums 41a and 42a around which the stencil sheet S is wound, and the printing drums 41a and 42a. , Plate mounting seats 41e, 42e extending in parallel to the axial direction D3 of the plate cylinders 41a, 42a; clamp plates 41b, 42b for clamping the stencil sheet S between the plate mounting seats 41e, 42e; And an adjusting mechanism 95 for adjusting the heights of the plate mounting seats 41e and 42e in the radial direction D4 of 42a. In this manner, the adjustment mechanism 95 adjusts the heights of the plate mounting seats 41e and 42e to correct the winding start position of the stencil sheet S which is one end of the stencil sheet S clamped by the clamp plates 41b and 42b. be able to. Therefore, it is possible to eliminate the inclination of the stencil sheet S with respect to the circumferential direction D2 of the outer peripheral surface of the plate cylinders 41a and 42a. In addition, the height of the plate mounting seats 41e and 42e can be maintained at a position where the inclination of the stencil sheet S is eliminated. Therefore, it is not necessary to return the plate mounts 41e and 42e whose heights have been adjusted to the positions before adjustment each time the plate is discharged, or to adjust the height again after the plate discharge, and the first print time is always increased. The oblique adjustment of the print image to be printed on the sheet P can be performed while suppressing. Further, compared with the case where the print image is obliquely adjusted by the correction of the image data, the deterioration of the image quality due to the correction of the image data can be avoided. Therefore, according to the present embodiment, it is possible to suppress an increase in printing time associated with the oblique adjustment of the print image to be printed on the sheet P, and to prevent deterioration of the image quality. In the present embodiment, even if the heights of the plate mounting seats 41e and 42e are adjusted and the inclination of the stencil sheet S with respect to the circumferential direction D2 of the outer peripheral surfaces of the plate cylinders 41a and 42a is eliminated, the plate mounting seat 41e, 42e and the printing drums 41a and 42a are not inclined in the circumferential direction D2 of the outer peripheral surface of the printing drums 41a and 42a. Therefore, compared with the adjustment method of moving the plate mounting seats 41e and 42e and the plate cylinders 41a and 42a so as to twist in the circumferential direction D2, the stencil sheet S is released to the first plate discharge unit 51 or the second plate discharge unit 52. Can perform the plate discharge processing more properly.

  Further, in the present embodiment, the stencil printing apparatus 1 further includes flip-up plates 41g and 42g for flipping the stencil sheet S from the plate cylinders 41a and 42a, and a control unit 91 for controlling the adjustment amount of the adjustment mechanism 95. Prepare. When the stencil sheet S is wound around the printing drums 41a and 42a for a predetermined period, the control unit 91 causes the plate 41g and 42g to lift the stencil sheet S from the printing drums 41a and 42a before the printing plate The adjustment mechanism 95 is controlled to lower the height of the mounting seats 41e and 42e. Thereby, the displacement in the height direction of the stencil sheet S due to the flip-up of the flip-up plates 41g and 42g can be increased (height h → height h + Δh). Therefore, when the stencil sheet S is wound around the printing drums 41b and 42b for a predetermined period, the stencil sheet S is stuck to either the first printing unit 41 or the second printing unit 42. However, it is possible to suppress the difficulty of dismounting.

  The present invention is not limited to the above-described embodiment as it is, and constituent elements can be modified and embodied without departing from the scope of the present invention at the implementation stage. In addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above-described embodiment. For example, all the components shown in the embodiment may be combined as appropriate. Of course, various modifications and applications are possible without departing from the scope of the invention. The invention described in the claims at the beginning of the application of the present application is appended below.

[Supplementary Note 1]
A cylindrical plate cylinder on which a stencil sheet is wound;
A plate mounting seat which is disposed in a part of the circumferential direction of the outer peripheral surface of the plate cylinder and extends parallel to the axial direction of the plate cylinder;
A clamp plate for clamping the stencil sheet between the plate mounting seat and
An adjusting mechanism for adjusting the height of the plate mounting seat in the radial direction of the plate cylinder;
A stencil printing apparatus comprising:

[Supplementary Note 2]
A raising plate for raising the stencil sheet from the plate cylinder;
And a control unit that controls an adjustment amount of the adjustment mechanism.
The control unit is configured to set the height of the plate mounting seat before the flip-up plate lifts the stencil sheet from the printing plate cylinder when the stencil sheet is wound around the printing plate cylinder for a predetermined period of time. Control the adjustment mechanism to lower it,
The stencil printing apparatus as claimed in claim 1, wherein the stencil printing apparatus comprises:

DESCRIPTION OF SYMBOLS 1 stencil printing apparatus 2 apparatus housing | casing 10 image reading part 20 platemaking part 21 base paper accommodating part 22 thermal head 23 platen roller 24 base paper feed roller 25 base paper cutter 31 and 32 guide member 41 1st printing part 41a plate cylinder 41b clamp board 41c Press roller 41d Conveying belt 41e Plate mounting seat 41f Magnet plate 41g Jumping plate 41h Spacer 42 Second printing section 42a Plate cylinder 42b Clamping plate 42c Press roller 42d Fourth sheet feeding roller 42e Plate mounting seat 42f Magnet plate 42g Jumping plate 42h Spacer 51 1st plate discharging unit 52 2nd plate discharging unit 60 sheet feeding unit 61 sheet feeding table 62 primary sheet feeding roller 63 secondary sheet feeding roller 70 reversing section 71 reversing belt 72 auxiliary member 73, 74 roller 75 suction section 76 loading table 77 intermediate conveyance belt 78 suction unit 79 Third paper feed roller 80 Ejection section 81 Ejection belt 82 Ejection tray 91 Control section 92 ROM
93 RAM
94 Operation panel 95 Adjustment mechanism 95a Adjustment motor 95a-1 Output shaft 95b Feed screw 95c Shaft support 95d Power transmission gear 96 Motor moving solenoid D1 Movement direction of plate-making unit 20 D2 Circumferential direction of plate cylinder 41a, 42a D3 Plate cylinder Axial direction of 41a, 42a D4 Radial direction of plate cylinder 41a, 42a S Perforated stencil sheet (master)
Sa stuck part P paper

Claims (2)

A cylindrical plate cylinder on which a stencil sheet is wound;
A plate mounting seat which is disposed in a part of the circumferential direction of the outer peripheral surface of the plate cylinder and extends parallel to the axial direction of the plate cylinder;
A clamp plate for clamping the stencil sheet between the plate mounting seat and
An adjusting mechanism for adjusting the height of the plate mounting seat in the radial direction of the plate cylinder;
A stencil printing apparatus comprising: A raising plate for raising the stencil sheet from the plate cylinder;
And a control unit that controls an adjustment amount of the adjustment mechanism.
The control unit is configured to set the height of the plate mounting seat before the flip-up plate lifts the stencil sheet from the printing plate cylinder when the stencil sheet is wound around the printing plate cylinder for a predetermined period of time. Control the adjustment mechanism to lower it,
The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus comprises: