JP2005205644A - Stencil printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printer wherein a drum side of a plate ejection part is simply constituted and which reduces costs by virtue of the use of a small number of components. <P>SOLUTION: This stencil printer is equipped with: a rotatable drum 16 which has an outer peripheral wall 22 formed of an ink-impermeable member, and where stencil base paper 10 is mounted on the surface of the wall 22; an ink supply means whose ink supply part 35 is provided in a printing upstream position with respect to a printing area of the wall 22, so as to supply ink to the surface of the wall 22 from the supply part 35; a press roll 19 for pressing fed printing paper against the wall 22; and the plate ejection part for ripping the base paper 10, mounted on the wall 22, from the wall 22 and carrying the ripped base paper 10 into a plate ejection box. The plate ejection part comprises: a pawl entry groove 45 which is provided along a rotational direction on the wall 22 and over an exposed area uncovered with the base paper 10 and an unexposed area covered with the base paper 10; and a plate ejection pawl 47 which is provided in such a manner as to freely enter/leave the groove 45. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stencil printing apparatus for transferring ink that bleeds from the perforations of a stencil sheet to a printing medium while conveying the printing medium while pressing the printing medium to a drum on which the stencil sheet is mounted, and particularly to a stencil sheet that has been used. It relates to the technology of peeling from the outer peripheral wall.

  This type of stencil printing apparatus rotates a drum making unit that creates a perforated image on a stencil sheet, and a drum on which the stencil sheet on which the perforated image is created is mounted, and conveys the printing sheet while pressing the printing paper against the rotating drum. A printing unit that transfers the ink image to the printing paper; a paper feeding unit that supplies the printing paper to the printing unit at a predetermined timing; and a paper discharge unit that discharges the printing paper printed by the printing unit to a predetermined position. And a stencil sheet that peels the stencil sheet from the outer peripheral wall of the drum and conveys the peeled stencil sheet into a stencil box. When a new image is printed, the stencil unit needs to mount a stencil sheet having a new perforated image on the drum, and therefore removes the stencil sheet that has been used from the outer peripheral wall of the drum.

  As a conventional example of such a plate discharging portion, there is one shown in FIGS. 6 and 7 (see, for example, Patent Document 1). As shown in FIGS. 6 and 7, the plate discharging unit 100 is provided on the stage plate 102 of the drum 101, and a flip-up plate 104 that moves in conjunction with opening and closing of the clamp plate 103, and the flip-up plate 104 A base paper holding member 105 that shifts in conjunction with opening and closing of the clamp plate 103 to an upper surface position and a position that retracts outward from the upper surface of the flip-up plate 104, and a position near the outer peripheral wall of the drum 101 that is fixed to the apparatus housing side. The stencil sheet nail which changes between the stencil sheet peeling position and the standby position separated from the outer peripheral wall of the drum 101, the stencil sheet conveying part which conveys the stencil sheet 110 peeled off by the stencil sheet nail, and the stencil sheet conveying part A stencil box 110 in which the stencil sheet 110 is stored (not shown).

  In the above configuration, when the clamp plate 103 is positioned at the clamp position, the tip of the stencil sheet 110 is sandwiched between the clamp plate 103 and the stage plate 102. When the clamp plate 103 rotates 180 degrees and moves to the clamp release position, the jump plate 104 is bent upward and deformed by the movement of the clamp plate 103 as shown in FIG. Then, the front end side of the stencil sheet 110 is flipped up from the outer peripheral wall 101 by the flip-up plate 104. Further, when the clamp plate 103 is moved to the clamp release position, the base paper holding member 105 is moved to the upper surface position of the stencil base paper 110 as shown in FIG. 6, and the front end of the stencil base paper 110 is pressed against the flip-up plate 104 side. That is, the tip of the stencil sheet 110 is held in a state of being lifted from the outer peripheral wall by the amount of deformation of the flip-up plate 104 without curling.

  Next, when the discharged plate claw is moved to the base paper peeling position and the drum 101 is rotated, the discharged plate claw enters between the outer peripheral wall of the drum 101 and the stencil sheet 110, and the discharged discharged plate claw is rotated by the rotation of the drum 101. The base paper 110 is gradually peeled off from the drum 101 from the leading end side. The leading end side of the peeled stencil sheet 110 is transported into the stencil box by the stencil transport unit, and the stencil operation is completed when all of the stencil sheet 110 is transported into the stencil box.

By the way, in the above-described conventional plate discharging unit 100, the leading end side of the stencil sheet 110 is flipped up from the outer peripheral wall of the drum 101 by the flip-up plate 104, and the discharging plate claw is interposed between the leading end of the stencil sheet 110 and the outer peripheral wall. I try to enter. This is because the outer peripheral wall of the drum 101 of the conventional example is formed of an ink-permeable member that is vulnerable to damage, and is easily damaged by contact with the platenail, so that the stencil sheet 110 does not come into contact with the peripheral wall. This is because it needs to be peeled off.
JP-A-8-48069

  However, in the conventional plate discharging unit 100 described above, the flip plate 104 and the base paper holding member 105 must be provided on the drum 101 side, and means must be taken to interlock these with the clamp plate 103. There is a problem that the configuration of the 100 drum 101 side is complicated, the number of parts is large, and the cost is high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stencil printing apparatus that has a simple configuration on the drum side of the stencil discharge unit, has a small number of parts, and is inexpensive.

  The invention according to claim 1, which achieves the above object, comprises a drum having an outer peripheral wall that is rotatable and formed of an ink-impermeable member, and a stencil sheet is mounted on the surface of the outer peripheral wall, and the drum. An ink supply unit upstream of the print area of the outer peripheral wall, and an ink supply unit that supplies ink to the surface of the outer peripheral wall from the ink supply unit; and a fed print medium to the outer peripheral wall A stencil printing apparatus comprising: a press roll to be pressed; and a stencil sheet mounted on an outer peripheral wall of the drum, the stencil sheet being peeled off from the drum, and a stencil sheet transporting the peeled stencil sheet into a stencil box. The plate removal portion has a claw entry groove provided in the outer peripheral wall of the drum and a plate removal claw that enters the claw entry groove and peels off the stencil sheet.

  The invention of claim 2 is the stencil printing apparatus according to claim 1, wherein the nail entry groove extends between an exposed area of the outer peripheral wall not covered with the stencil sheet and a non-exposed area covered with the stencil sheet. And the discharge plate claw is provided movably between a base paper peeling position entering the claw entry groove and a standby position spaced above the outer peripheral wall. And

  A third aspect of the present invention is the stencil printing apparatus according to the second aspect, wherein the claw entry groove is disposed on the rear end surface side in the printing rotation direction of the stencil sheet to be mounted on the outer peripheral wall. And

  A fourth aspect of the present invention is the stencil printing apparatus according to the second aspect, wherein the claw entry groove is arranged on a front end surface side of the stencil sheet mounted on the outer peripheral wall in the printing rotation direction. And

  According to the first aspect of the present invention, by utilizing the fact that the outer peripheral wall of the drum is formed of an ink-impermeable member that is not damaged at all by the contact of the discharge plate nail, the discharge plate nail is placed in the nail entry groove formed in the outer peripheral wall. The stencil sheet can be peeled off from the outer peripheral wall, and it is only necessary to form a claw entry groove on the drum side. Therefore, the configuration of the drum side of the plate discharging part is simple, and the number of parts is small and the cost is low. Further, if the platen claw in the standby position is moved to a position where it comes into contact with the bottom surface of the claw entry groove, it can be set at the base paper peeling position, so that the platen claw moving means and its control means can be made simple and easy. . That is, in the conventional example, it is necessary to move the discharge plate claw to a hollow position between the stencil sheet and the outer peripheral wall without bringing the discharge plate nail into contact with the outer peripheral wall. However, in the present invention, this can be made simple and easy.

  The invention of claim 2 uses the rotation of the drum because the discharged plate claw enters the claw entry groove formed on the outer peripheral wall, and the discharged discharged plate claw can gradually peel the stencil sheet from the outer peripheral wall by the rotation of the drum. Then, the plate removal operation can be performed.

  According to invention of Claim 3, it can peel off from the rear-end surface side of stencil paper. Therefore, it is possible to release the clamping of the stencil sheet by using the peeling force of the discharging part, and it is not necessary to perform the clamping releasing operation before the discharging operation.

  According to invention of Claim 4, it can peel off from the front end surface side of stencil paper. Accordingly, the plate discharging operation can be performed by rotating the drum in the printing rotation direction, and it is not necessary to change the rotation direction of the drum between the printing mode and the discharging mode.

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

  1 to 3 show a first embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a stencil printing apparatus, FIG. 2 is a perspective view of a drum, and FIG. 3 shows a state in which an ejected nail enters a nail entry groove. It is a perspective view.

  As shown in FIG. 1, the stencil printing apparatus 1 </ b> A includes a document reading unit (not shown), a plate making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharge unit 5 and a plate discharging unit 6. It is configured.

  The document reading unit has a document setting table and an image sensor, and the image sensor optically reads the image data of the document set on the document setting table and converts it into an electrical signal.

  The plate making unit 2 is disposed at a position opposite to the thermal head 12, a base paper storage unit 11 that stores the rolled long stencil base paper 10, a thermal head 12 that is disposed downstream of the base paper storage unit 11. Platen roll 13, a pair of base paper feed rolls 14, 14 disposed downstream of the platen roll 13 and the thermal head 12, and a base paper cutter disposed downstream of the pair of base paper feed rolls 14, 14. 15.

  Then, the long stencil sheet 10 is transported by the rotation of the platen roll 13 and the base paper feed roll 14, and each point-like heating element of the thermal head 12 selectively generates heat based on the image data read by the image sensor. Thus, the stencil sheet 10 is made by heat-sensitive punching, and the stencil sheet 10 thus made is cut with a stencil sheet cutter 15 to produce a stencil sheet 10 having a predetermined length.

  The printing unit 3 includes a drum 16 that is rotated by a driving force of a main motor (not shown), a base paper clamp unit 17 that is provided on the outer peripheral surface of the drum 16 and clamps the leading end of the stencil base paper 10, and a surface of the drum 16 And an ink supply means 18 for supplying ink to the drum 16 and a press roll 19 disposed below the drum 16.

  As shown in FIG. 2, the drum 16 includes a support shaft 20 fixed to the apparatus main body H, a pair of side disks 21 rotatably supported by the support shaft 20, and a pair of side disks 21. And a cylindrical outer peripheral wall 22 fixed to. The outer peripheral wall 22 is integrated with the pair of side disks 21 and selectively rotated in the forward and reverse rotation directions (printing rotation direction A and printing reverse rotation direction B) by the rotational force of the main motor. The outer peripheral wall 22 is formed of an ink impermeable member that has rigidity and does not allow ink to pass. Therefore, the material selectivity of the outer peripheral wall 22 is very high, and it is formed of a member (for example, metal) that is extremely resistant to damage compared to the case of the conventional example. Further, the outer peripheral surface of the outer peripheral wall 22 is subjected to a fluororesin coating process such as a Teflon (registered trademark) process to form a cylindrical surface having no unevenness.

  The base paper clamp unit 17 includes a high elastic member 23 such as rubber embedded in a long groove formed along the axial direction of the support shaft 20 of the outer peripheral wall 22, and a slit groove 24 formed in the high elastic member 23. It is configured. The stencil sheet 10 is clamped by inserting the leading end side of the stencil sheet 10 into the slit groove 24 with a stencil sheet insertion plate 25. The base paper clamp unit 17 can clamp the stencil base paper 10 without protruding onto the outer peripheral wall 22.

  As shown in FIG. 2, the ink supply means 18 transports the ink container 30 in which ink is stored, the ink pump 31 that sucks ink in the ink container 30, and the ink sucked by the ink pump 31. The first pipe 32 is connected to the other end of the first pipe 32 and an ink passage is formed therein, and is rotatably supported on the outer peripheral side of the support shaft 20. The formed rotary joint 33, one end connected to the rotary joint 33, the other end connected to the outer peripheral wall 22, and the other end of the second pipe 34 are connected to each other. It is composed of an ink supply unit 35 that opens on the surface.

  The ink supply unit 35 is opened on the surface of the outer peripheral wall 22 along the printing orthogonal direction N at a printing upstream position from the printing area of the outer peripheral wall 22.

  The press roll 19 is configured to be able to change between a pressing position where it is pressed against the outer peripheral wall 22 of the drum 16 by the driving force of the solenoid device 36 and a standby position where the press roll 19 is separated from the outer peripheral wall 22 of the drum 16. The press roll 19 is always positioned at the pressing position during the printing mode period (including trial printing), and is positioned at the standby position during the period other than the printing mode.

  Then, the leading end of the stencil sheet 10 conveyed from the plate making unit 2 is clamped by the stencil sheet clamp unit 17, and in this clamped state, the drum 16 is rotated so that the stencil sheet 10 is wound around the outer peripheral wall 22 of the drum 16 and mounted. When the printing paper (printing medium) 37 fed from the paper feeding unit 4 in synchronization with the rotation of the paper 16 is pressed against the stencil paper 10 wound around the drum 16 by the press roll 19, the stencil paper 10 is applied to the printing paper 37. The ink is transferred from the perforations of the ink and an image is printed.

  As shown in FIG. 1, the paper feed unit 4 includes a paper feed tray 38 on which the print paper 37 is stacked, and primary paper feed rolls 39 and 40 that transport only the uppermost print paper 37 from the paper feed base 38. And a pair of secondary paper feed rolls 41 and 41 for conveying the printing paper 37 conveyed by the primary paper supply rolls 39 and 40 between the drum 16 and the press roll 19 in synchronization with the rotation of the drum 16. . The primary feed rolls 39 and 40 are configured to selectively transmit the rotation of a main motor (not shown) via a feed clutch (not shown).

  The paper discharge unit 5 includes a paper separation claw 42 that separates the printed printing paper 37 from the drum 16, a conveyance path 43 through which the printing paper 37 separated from the drum 16 by the paper separation claw 42 is conveyed, And a paper discharge tray 44 on which the printing paper 37 discharged from the conveyance path 43 is placed.

  As shown in FIGS. 1 and 3, the plate discharging unit 6 includes a pair of left and right claw entry grooves 45, 45 formed on the outer peripheral wall 22 of the drum 16, and a support shaft 46 that is rotatably supported on the apparatus main body H side. A pair of plate removal pawls 47 and 47 whose base end side is fixed to the support shaft 46 and whose distal end side can advance and retreat into the claw entry groove 45, a solenoid device 48 that drives the pair of plate discharge pawls 47 and 47, and a pair of A discharge plate conveying belt means 49 for guiding the rear end of the stencil sheet 10 peeled off from the outer peripheral wall 22 of the drum 16 by the discharge plate claws 47 and 47 and conveying the used used stencil sheet 10 while being peeled off from the drum 16; The stencil sheet 10 transported by the stencil transport belt means 49 and a stencil sheet box 50 for storing the stencil sheet 10.

  The pair of nail entry grooves 45, 45 is a portion where the rear end side of the stencil sheet 10 to be mounted is arranged in the printing rotation direction A, and the exposed area of the outer peripheral wall 22 not covered by the stencil sheet 10 and the stencil sheet 10. Is formed along the printing rotation direction A over the non-exposed area covered by the. The pair of discharge plate pawls 47 and 47 has a leading end side that is separated from the base paper peeling position (the position in FIG. 3) that enters the claw entry groove 45 by driving the solenoid device 48 and a standby position that is spaced above the surface of the outer peripheral wall 22 ( 1).

  Next, the operation of the stencil printing apparatus 1A having the above configuration will be briefly described.

  First, when the plate making mode is selected, the plate making unit 2 transports the stencil sheet 10 by the rotation of the platen roll 13 and the base paper feed roll 14, and generates a large number of heats of the thermal head 12 based on the image data read by the document reading unit. When the body selectively generates heat, the stencil sheet 10 is thermally perforated to make a plate, and a predetermined portion of the stencil sheet 10 is cut with a base paper cutter 15 to create a stencil sheet 10 having a desired size.

  In the printing unit 3, the front end of the stencil sheet 10 made by the plate making unit 2 is clamped to the stencil sheet clamping unit 17 of the drum 16, and the drum 16 is rotated in this clamped state to rotate the stencil sheet 10 to the outer peripheral wall 22 of the drum 16. Wrap around and plate.

  Next, when the printing mode is selected, the outer peripheral wall 22 of the drum 16 is rotationally driven in the printing unit 3 and the driving of the ink supply means 18 is started. Then, ink is supplied from the ink supply unit 35 to the outer peripheral wall 22, and the supplied ink is held between the outer peripheral wall 22 and the stencil sheet 10, and the press roll 19 is displaced from the standby position to the pressing position. .

  In synchronization with the rotation of the drum 16, the paper feeding unit 4 feeds the printing paper 37 between the drum 16 and the press roll 19. The fed printing paper 37 is pressed against the outer peripheral wall 22 of the drum 16 by the press roll 19 and is conveyed by the rotation of the outer peripheral wall 22 of the drum 16. That is, the printing paper 37 is conveyed while being in close contact with the stencil sheet 10.

  In parallel with the conveyance of the printing paper 37, the ink held between the outer peripheral wall 22 of the drum 16 and the stencil sheet 10 is downstream in the printing rotation direction A while being squeezed by the pressing force of the press roll 19. While being diffused, the diffused ink oozes out from the perforations of the stencil sheet 10 and is transferred to the printing paper 37 side. Thus, an ink image is printed on the printing paper 37 in the process of passing between the outer peripheral wall 22 of the drum 16 and the press roll 19. The printing paper 37 that has passed between the outer peripheral wall 22 of the drum 16 and the press roll 19 is peeled off from the drum 16 by the paper separation claw 42, and the printing paper 37 that is separated from the drum 16 passes through the conveyance path 43. Then, the paper is discharged onto the paper discharge tray 44 and stacked there.

  When printing of the set number of prints is completed, the rotation of the outer peripheral wall 22 of the drum 16 is stopped and the drive of the ink supply means 18 is stopped. Thereby, the supply of ink to the outer peripheral wall 22 is stopped. Further, the press roll 19 is returned from the pressing position to the standby position, and enters the standby mode.

  When the plate release mode is selected by starting a new plate making or the like, the solenoid device 48 is driven to move the pair of plate discharge claws 47 and 47 to the base paper peeling position. Next, the outer peripheral wall 22 of the drum 16 is rotated in the printing reverse rotation direction B. Then, by the rotation of the outer peripheral wall 22, the rear end side of the stencil sheet 10 is guided along the upper surfaces of the pair of plate discharging claws 47 and 47 and gradually peeled off from the outer peripheral wall 22. The rear end side of the stencil sheet 10 peeled off is guided to the stencil conveying belt means 49. When the rear end side of the stencil sheet 10 reaches the stencil conveying belt means 49, the stencil sheet 10 is conveyed by the conveying force of the stencil conveying belt means 49. Is transported into the plate removal box 50 while being peeled off from the outer peripheral wall 22. When the stencil sheet 10 is hardly wound around the outer peripheral wall 22 and the stencil sheet 10 is only clamped by the stencil sheet clamp portion 17, the stencil sheet conveying belt means 49 continues to be driven. The leading end side of the stencil sheet 10 is pulled out from the slit groove 24 by the conveying force of the belt means 49, and the clamp is released. When all of the stencil sheet 10 that has been unclamped is conveyed to the evacuation box 50, the evacuation operation is completed.

  In this stencil printing apparatus 1A, the outer peripheral wall 22 of the drum 16 is formed of an ink impermeable member that is not damaged at all by the contact of the pair of plate discharging claws 47, 47. The stencil sheet 10 is peeled off from the outer peripheral wall 22 by making a pair of stencil claw 47, 47 enter the claw entry grooves 45, 45, and only a pair of claw entry grooves 45, 45 are formed on the drum 16 side. Good. Therefore, the configuration of the plate discharging unit 6 on the drum 16 side is simple, and the number of parts is small and the cost is low. Further, if the pair of discharge plate claws 47, 47 in the standby position is moved to a position where they hit the bottom surfaces of the pair of claw entry grooves 45, 45, they can be set at the base paper peeling position. In addition, the control means can be configured simply and easily. That is, in the conventional example, it is necessary to move the discharge plate claw to a hollow position between the stencil sheet and the outer peripheral wall without bringing the discharge plate nail into contact with the outer peripheral wall. However, in the present invention, this can be made simple and easy.

  In the first embodiment, the pair of claw entry grooves 45, 45 are provided along the rotation direction across the exposed area of the outer peripheral wall 22 that is not covered by the stencil sheet 10 and the non-exposed area that is covered by the stencil sheet 10. The pair of discharge plate claws 47, 47 is provided movably between the base paper peeling position that enters the pair of claw entry grooves 45, 45 and the standby position that is spaced above the outer peripheral wall 22. A pair of discharge plate claws 47 and 47 are made to enter a pair of claw entry grooves 45 and 45 formed on the outer peripheral wall 22, and the pair of discharge plate claws 47 and 47 that have entered the stencil paper 10 gradually move the outer peripheral wall by the rotation of the drum 16. Since the drum 22 can be peeled off, the plate removal operation can be performed using the rotation of the drum 16.

  Furthermore, in the first embodiment, the pair of claw entry grooves 45, 45 are arranged on the rear end surface side of the stencil sheet 10 attached to the outer peripheral wall 22 in the printing rotation direction A. Can be peeled off. Therefore, the clamping force of the stencil sheet 10 can be released by using the peeling force of the plate discharging unit 6, and there is an advantage that it is not necessary to perform the clamp releasing operation before the plate discharging operation.

  In the first embodiment, the clamp portion 17 forms the slit groove 34 in the elastic member 23, and the tip of the stencil sheet 10 inserted into the slit groove 34 is clamped by the elastic return force of the high elastic member 23. Although it clamped by this, you may make it clamp using the clamp plate rotatably supported by the outer peripheral wall 22 like the prior art example. However, in the case of such a clamp portion, an operation of releasing the clamp plate from the clamp is necessary during the plate removal operation.

  4 and 5 show a second embodiment of the present invention, FIG. 4 is a schematic configuration diagram of a stencil printing apparatus, and FIG. 5 is a perspective view of a drum.

  4 and 5, when comparing the stencil printing apparatus 1B of the second embodiment and that of the first embodiment, the configurations of the clamp unit 60 and the plate discharging unit 6 are different.

  That is, the clamp portion 60 of the second embodiment is configured by a clamp recess 61 formed on the outer peripheral wall 22 of the drum 16 and a detachable clamp member 62 that is detachably provided in the clamp recess 61. A clamp operation unit 63 is provided on the apparatus main body H side, and the detachable clamp member 62 is mounted in the clamp recess 61 by the clamp operation unit 63 or the detachable clamp member 62 mounted in the clamp recess 61 is removed. You can also.

  As in the first embodiment, the plate discharging unit 6 has a pair of left and right claw entry grooves 45, 45 on the outer peripheral wall 22 side of the drum 16. The pair of claw entry grooves 45, 45 are attached to the outer peripheral wall 22. The rotation direction of the printing stencil sheet 10 is a portion where the front end side in the printing rotation direction A of the stencil sheet 10 is disposed and the exposed area of the outer peripheral wall 22 not covered by the stencil sheet 10 and the non-exposed area covered by the stencil sheet 10. It is formed along A. Since the front end of the stencil sheet 10 in the printing rotation direction A is located in the clamp recess 61, the pair of claw entry grooves 45, 45 are partially formed on the bottom surface of the clamp recess 61. Further, the configuration of the plate body 6 on the apparatus main body H side is the same as that of the first embodiment except that the support shaft 46 and the solenoid device 48 are connected via two connection links 66 and 67. Yes, the same reference numerals are given to the same components and the description thereof is omitted. Furthermore, since the configuration other than the plate removal unit 6 is the same as that of the first embodiment, the same reference numerals are given and the description thereof is omitted.

  In the above configuration, the clamping operation will be described. With the detachable clamping member 62 removed, the leading end side of the stencil sheet 10 that has been subjected to plate making is moved to the top of the recess 61. Next, when the detachable clamp member is mounted in the clamp recess 61, the leading end side of the stencil sheet 10 is clamped by being sandwiched between the surface of the clamp recess 61 and the detachable clamp member 62.

  Explaining the plate discharging operation, first, the detachable clamp member 62 is removed from the clamp recessed portion 61 by the clamp operating portion 63, and the clamping of the stencil sheet 10 is released. Next, the solenoid device 48 is driven to move the pair of discharge plate pawls 47 to the base paper peeling position. Next, when the outer peripheral wall 22 of the drum 16 is rotated in the printing rotation direction A, the rotation of the outer peripheral wall 22 guides the leading end side of the stencil sheet 10 along the upper surfaces of the pair of plate discharge claws 47 and 47 and gradually. It is peeled off from the outer peripheral wall 22. The leading end side of the stencil sheet 10 that has been peeled off is guided to the stencil conveying belt means 49, and when the leading end side of the stencil sheet 10 reaches the stencil conveying belt means 49, the stencil sheet 10 is surrounded by the conveying force of the stencil conveying belt means 49. The sheet is transported into the discharge box 50 while being peeled off from the sheet 22. Then, when all of the stencil sheet 10 is conveyed to the evacuation box 50, the evacuation operation is completed.

  Also in the stencil printing apparatus 1B of the second embodiment, the outer peripheral wall 22 of the drum 16 is formed of an ink impermeable member that is not damaged at all by the contact of the pair of plate discharge claws 47, 47, as in the first embodiment. The stencil sheet 10 is peeled off from the outer peripheral wall 22 by causing the pair of drainage pawls 47 and 47 to enter the pair of claw entering grooves 45 and 45 formed on the outer peripheral wall 22. It is only necessary to form a pair of claw entry grooves 45, 45. Therefore, the configuration of the plate discharging unit 6 on the drum 16 side is simple, and the number of parts is small and the cost is low. Further, if the pair of discharge plate claws 47, 47 in the standby position is moved to a position where they hit the bottom surfaces of the pair of claw entry grooves 45, 45, they can be set at the base paper peeling position. In addition, the control means can be configured simply and easily. That is, in the conventional example, it is necessary to move the discharge plate claw to a hollow position between the stencil sheet and the outer peripheral wall without bringing the discharge plate nail into contact with the outer peripheral wall. However, in the present invention, this can be made simple and easy.

  In the second embodiment, the pair of claw entry grooves 45, 45 are arranged on the front end surface side in the printing rotation direction A of the stencil sheet 10 attached to the outer peripheral wall 22. Can be peeled off. Accordingly, the plate discharging operation can be performed by rotating the drum 16 in the printing rotation direction A, and there is no need to change the rotation direction of the outer peripheral wall 22 of the drum 16 in the printing mode and the discharging mode.

  In the first and second embodiments, the claw entry groove 45 and the platen claw 47 of the plate discharging unit 6 are provided in a pair at symmetrical positions on the outer peripheral wall 22, but the stencil sheet 10 is securely attached to the outer peripheral wall. As long as it can be peeled off from the outer peripheral wall 22, it may be provided at three or more positions on the outer peripheral wall 22, or may be provided at one position wider at the center position.

1 is a schematic configuration diagram of a stencil printing apparatus according to a first embodiment of the present invention. 1 is a perspective view of a drum according to a first embodiment of the present invention. It is a perspective view which shows 1st Embodiment of this invention and shows the state which the platen removal nail entered the nail | claw approach groove | channel. FIG. 2 is a schematic configuration diagram of a stencil printing apparatus according to a second embodiment of the present invention. It is a perspective view of a drum, showing a 2nd embodiment of the present invention. It is a perspective view of the principal part of the plate discharging part of a prior art example. It is a side view of the principal part of the plate discharging part of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B Stencil printing apparatus 6 Plate discharging part 10 Stencil base paper 16 Drum 18 Ink supply means 19 Press roll 22 Outer peripheral wall 35 Ink supply part 37 Printing paper (printing medium)
45 Claw entrance groove 47 Plate removal claw 50 Plate ejection box A Printing rotation direction B Printing reverse rotation direction

Claims (4)

A drum having an outer peripheral wall that is rotatable and formed of an ink impermeable member, and a stencil sheet is mounted on the surface of the outer peripheral wall, and a printing upstream position from a printing area of the outer peripheral wall of the drum. An ink supply unit that supplies ink to the surface of the outer peripheral wall from the ink supply unit; a press roll that presses the fed print medium against the outer peripheral wall; and an outer peripheral wall of the drum. In a stencil printing apparatus comprising: a stencil sheet that peels off the mounted stencil sheet from the drum and transports the peeled stencil sheet into a stencil box;
The stencil printing apparatus, wherein the stencil printing unit includes a claw entry groove provided on an outer peripheral wall of the drum and a stencil claw that enters the claw entry groove and peels off the stencil sheet. The stencil printing apparatus according to claim 1,
The claw entry groove is provided along a rotation direction across an exposed area of the outer peripheral wall that is not covered with the stencil sheet and a non-exposed area that is covered with the stencil sheet, and the discharge claw is disposed in the claw entry groove. A stencil printing apparatus, wherein the stencil printing apparatus is provided so as to be movable between a base paper peeling position entering the paper and a standby position spaced above the outer peripheral wall. The stencil printing apparatus according to claim 2,
The stencil printing apparatus, wherein the claw entry groove is disposed on a rear end surface side in a printing rotation direction of the stencil sheet mounted on the outer peripheral wall. The stencil printing apparatus according to claim 2,
The stencil printing apparatus, wherein the claw entry groove is arranged on a front end surface side in a printing rotation direction of the stencil sheet mounted on the outer peripheral wall.

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