JP2014162029A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printer capable of feeding a sheet to a nip part in an appropriate state, even if an air blowing mechanism is used in order to detach the sheet from a plate cylinder.SOLUTION: A stencil printer 10 includes: a plate cylinder (13a) which is rotatably driven with stencil base paper (18) attached to an outer periphery; a press roller 13f movable between a pressing position where the press roller is pressed against the plate cylinder and forms a nip part 13g, and a retracting position separated from the plate cylinder; a feed mechanism (14e, 14f, 31, 32) for feeding a sheet P toward the nip part 13g with rotation of the plate cylinder; an air blowing mechanism (19) for blowing air onto the nip part 13g from a downstream side in a rotation direction of the plate cylinder; and a lower side movable guide plate 33 and an upper side movable guide plate 34 disposed so as to be parallel to and near to each other, in order to guide the sheet P fed by the feed mechanism to the nip part 13g. The lower side movable guide plate 33 and the upper side movable guide plate 34 are displaced with the displacement of the press roller 13f.

Description

  The present invention relates to a stencil printing apparatus that forms a printed image by pressing a sheet against a plate cylinder.

  Conventionally, in a stencil printing apparatus, an apparatus in which an air knife as an air blowing mechanism is provided in order to peel off a sheet, which is pressed against a plate cylinder to form a printed image, from the plate cylinder has been considered (for example, see Patent Document 1). ). The air knife peels off the paper from the plate cylinder by blowing air toward a location where the paper is pressed in the plate cylinder (hereinafter also referred to as a nip portion).

  However, in the above-described conventional configuration, the air blown from the air knife is also applied to the leading end portion of the paper that is sent to the nip portion to form a printed image. Then, in the fed sheet, there is a possibility that the leading end portion may wave or rise with respect to the plate cylinder, so that it cannot reach the nip portion in an appropriate state. In the stencil printing apparatus, when the paper cannot reach the nip portion in an appropriate state as described above, it is difficult to set a position (hereinafter also referred to as an image position) on the paper where the print image is formed to a predetermined position. End up. This causes variations in image position between sheets when printing multiple copies, and color misregistration occurs especially when performing multicolor printing by passing the nip portion multiple times. End up.

  The present invention has been made in view of the above circumstances, and provides a stencil printing apparatus that can feed a sheet to an nip portion in an appropriate state even if a blower mechanism is used to peel the sheet from the plate cylinder. The purpose is to do.

  The stencil printing apparatus according to claim 1, wherein a stencil sheet is mounted on an outer periphery of the stencil printing machine and is driven to rotate. A retraction position, a press roller that is displaceable between, a feeding mechanism that feeds paper toward the nip portion in accordance with the rotation of the plate cylinder, and the nip from the downstream side in the rotation direction of the plate cylinder A blower mechanism that blows air onto a portion; and a lower movable guide plate and an upper movable guide plate that are arranged close to each other in parallel to guide the sheet fed by the feed mechanism to the nip portion, and The lower movable guide plate and the upper movable guide plate are displaced with the displacement of the press roller.

  In the stencil printing apparatus according to the present invention, even if a blower mechanism is used to peel the paper from the plate cylinder, the paper can be fed into the nip portion in an appropriate state.

It is explanatory drawing which shows the structure of the stencil printing apparatus 10 as one Example of the stencil printing apparatus of this invention. It is explanatory drawing which shows partially the periphery location of the press roller 13f, and shows a mode that a pair of support arm part 35 was made into the pressing position, and the press roller 13f was pressed on the outer peripheral surface (master 18) of the printing drum 13a. . It is explanatory drawing for demonstrating the effect | action of the air knife 19, (a) shows a mode that the press roller 13f is lifted, the nip part 13g is formed, and the air knife 19 sprays air on the said nip part 13g, (B) shows a state in which the leading end of the paper P is peeled off from the outer peripheral surface (master 18) of the printing drum 13a by its own stiffness, and (c) shows the paper P being applied to the air blown from the air knife 19 to the printing drum 13a. The state of being continuously peeled from the outer peripheral surface (master 18) is shown. It is explanatory drawing which looked at a mode that the press roller 13f, each upper registration roller 14e, the upper fixed guide plate 32, and the upper movable guide plate 34 were provided from the upper direction (printing drum 13a side). It is explanatory drawing for demonstrating the structure of the lower side movable guide plate. FIG. 5 is an explanatory diagram for explaining a configuration in which a lower movable guide plate 33 and an upper movable guide plate are attached to a pair of support arm portions 35, and the periphery of both the support arm portions 35 from the downstream side in the sheet discharge direction Cd. Show how it looked. It is explanatory drawing for demonstrating the structure by which the lower side movable guide plate 33 is attached to a pair of support arm part 35. FIG. It is explanatory drawing for demonstrating the structure of the upper side movable guide plate. It is explanatory drawing for demonstrating the structure by which the lower side movable guide plate 33 and the upper side movable guide plate 34 are fixed via a pair of spacer member 39. FIG. FIG. 3 is an explanatory view similar to FIG. 2, partially showing a peripheral portion of the press roller 13 f, and a state in which the pair of support arm portions 35 are set to the retracted position and the press roller 13 f is retracted radially outward from the trajectory T. Indicates. It is explanatory drawing similar to FIG. 2 which partially shows the peripheral part of the press roller 13f, and shows a mode in the middle of a pair of support arm part 35 moving from a retracted position to a pressing position. It is explanatory drawing similar to FIG. 2 which shows partially the periphery location of the press roller 13f in the stencil printing apparatus 50 for description of the subject of a technique.

  Embodiments of a stencil printing apparatus according to the present invention will be described below with reference to the drawings.

  A schematic configuration of a stencil printing apparatus 10 as an embodiment of the stencil printing apparatus according to the present invention will be described with reference to FIGS. 2, 10, and 11, the conveyance unit 15 a of the paper discharge unit 15 is omitted for easy understanding. Further, in FIG. 3A, the paper P is omitted in order to facilitate understanding of how the nip portion 13g is formed. Further, in FIG. 6, the press roller 13f and the upper registration rollers 14e are omitted for easy understanding.

  As shown in FIG. 1, the stencil printing apparatus 10 is provided with a document reading unit 11, a plate making unit 12, a printing unit 13, a paper feeding unit 14, a paper discharging unit 15, and a plate discharging unit 16 in a main body cabinet 10 a that defines the outer shape. And are provided. The document reading unit 11 is provided with a separation roller 11a, a pair of front document transport rollers 11b and 11c, and a pair of rear document transport rollers 11d and 11e that are rotatable. In the document reading unit 11, the separation roller 11a, the front document transport roller pair 11b, 11c, and the rear document transport roller pair 11d, 11e are appropriately rotated by a driving unit to be set on the document receiving table 11f. The original 17 is conveyed onto the contact glass 11g. The document tray 11f is provided at the upper part of the main body cabinet 10a. The document reading unit 11 includes a fluorescent lamp 11h, a mirror 11i, a lens 11j, and an image sensor 11k. The fluorescent lamp 11h is provided below the contact glass 11g, and the mirror 11i is provided at a position for receiving reflected light from the document 17 on the contact glass 11g illuminated by the fluorescent lamp 11h. The lens 11j is provided in the optical path of the reflected light from the mirror 11i, and the image sensor 11k is provided at a position for receiving the reflected light collected by the lens 11j. The image sensor 11k is composed of a solid-state imaging device such as a CCD (charge coupled device) image sensor or a CMOS image sensor, and photoelectrically converts the received reflected light and outputs it as an electrical signal.

  The document reading unit 11 is provided with an A / D conversion board in the main body cabinet 10a, and the A / D conversion board converts an electrical signal output from the image sensor 11k into a digital image signal. In the document reading unit 11, the document 17 conveyed on the contact glass 11g is illuminated with a fluorescent lamp 11h, and the reflected light is received by the image sensor 11k through the mirror 11i and the lens 11j, thereby generating a digital image signal. The image signal is appropriately subjected to image processing and stored in the storage unit. This is an image reading process in the document reading unit 11. In the document reading section 11, the document 17 whose image has been read is discharged onto a document tray 11n provided in the upper part of the main body cabinet 10a. Further, in the document reading unit 11, a separation blade 11m is provided above the separation roller 11a, and when there are a plurality of documents 17 set on the document receiving tray 11f, the lowermost layer is separated by the separation blade 11m. Only one sheet (original 17) is conveyed to perform the image reading process.

  In parallel with the image reading process by the document reading unit 11, the plate making unit 12 forms a perforation pattern portion on the unmade master 18, that is, the master 18 on which the perforation pattern portion is not formed. In the plate making unit 12, a punching pattern unit is formed in the master 18 based on the image signal stored in the storage unit, that is, the image signal generated by the document reading unit 11. The master 18 has, for example, a so-called laminate structure in which a thermoplastic resin film and a support body provided with a large number of holes for supporting it are bonded together. The master 18 is provided by forming a master roll 18b by being wound around the core tube 18a.

  The plate making unit 12 is provided with a platen roller 12a and a pair of feed rollers 12b and 12c that can be rotated by a drive motor. In the plate making section 12, the platen roller 12a and the feed roller pairs 12b and 12c are appropriately rotated to draw out the non-perforated master 18 from the master roll 18b. The plate making section 12 is provided with a thermal head 12d pressed against the platen roller 12a, and the drawn master 18 is pressed against the thermal head 12d. The thermal head 12d is configured by providing minute heating elements in the main scanning direction. The thermal head 12d selectively heats each heating element in accordance with the image signal stored in the storage unit described above, thereby selectively selecting the thermoplastic resin film of the master 18 pressed against the platen roller 12a. Wear by melting at appropriate positions. As a result, the thermal head 12d forms a perforated pattern portion corresponding to the image information in the master 18. For this reason, the plate making unit 12 passes the non-perforated master 18 between the platen roller 12a and the thermal head 12d, thereby perforating based on the image signal stored in the storage unit, that is, the image signal generated by the document reading unit 11. A pattern portion is formed on the master 18 for plate making. This is the plate making process in the plate making unit 12. That is, the master making unit 12 forms a master 18 as a stencil sheet by this plate making process. The plate-making unit 12 is provided with a pair of plate-feeding rollers 12e and 12f that can be rotated by a drive motor, and supplies the plate-making master 18 to the printing unit 13 (a printing drum 13a described later). The plate making unit 12 is provided with a cutter 12g between the platen roller 12a and the feed roller pairs 12b and 12c. The master 18 is made by cutting the master 18 with the cutter 12g in the plate feeding process described later. Let 18 be a constant length dimension.

  The printing unit 13 includes a printing drum 13 a that wraps the master 18 that has been made from the plate making unit 12 around the outer peripheral surface. The printing drum 13a has a cylindrical shape, and is configured by being provided with a plate cylinder in which a large number of apertures that allow printing ink to pass therethrough are formed (so-called porous structure). For this reason, the printing drum 13a functions as a plate cylinder on which a master-made master 18 that is a stencil sheet is mounted on the outer periphery. The printing drum 13a can be rotated about its own central axis by the driving device. An ink roller 13b and a doctor roller 13c are provided inside the printing drum 13a. The ink roller 13b rotates in contact with the inner peripheral surface of the printing drum 13a. The doctor roller 13c is arranged at a slight interval from the ink roller 13b, and forms an ink reservoir 13d between the doctor roller 13c and the ink roller 13b. On the inner peripheral side of the printing drum 13a, ink is supplied from the ink supply distributor to the ink reservoir 13d, and the ink roller 13b is rotated in the same direction as the rotation direction of the printing drum 13a in synchronization with the rotation speed. For this reason, in the printing drum 13a, the ink is supplied to the inner peripheral side by the ink roller 13b rotating in contact with the inner peripheral surface, and the ink oozes out from each opening to the outer peripheral surface.

  In the printing unit 13, a master clamper 13e is provided on a part of the outer peripheral surface of the printing drum 13a. The master clamper 13e is openable and closable with respect to the outer peripheral surface of the printing drum 13a, and the leading end of the master 18 that is made from the plate making unit 12 to the printing unit 13 (the printing drum 13a) is supplied at a fixed timing. Clamp (hold). In the printing drum 13a, by rotating and driving in the direction of the arrow A1, the master 18 having its front end clamped (held) by the master clamper 13e is gradually wound around the outer peripheral surface. When the master 18 is completely wound around and mounted on the outer peripheral surface of the printing drum 13a, the plate feeding process by the plate making unit 12 is completed. In the printing drum 13a, in cooperation with a press roller 13f, which will be described later, the master 18 is brought into close contact with the outer peripheral surface by the ink that has oozed out from each opening, and the ink oozes out from the perforated pattern portion of the master 18. The paper P is sent from the paper supply unit 14 to the printing drum 13a.

  The paper supply unit 14 appropriately supplies (so-called paper supply) the paper P stacked on the paper supply table 14a provided on the right side of the print drum 13a toward the print drum 13a. In the paper supply unit 14, a paper supply roller 14b and a pair of separation rollers 14c and 14d are rotatably provided, and the uppermost sheet (paper P) of the papers P stacked on the paper supply table 14a. ) Between the upper registration roller 14e and the lower registration roller 14f that make a pair in the vertical direction (see arrow A2). Hereinafter, the direction in which the paper P is transported is referred to as a paper transport direction A2. The upper registration roller 14e is rotatable and is pressed against the lower registration roller 14f. The lower registration roller 14f can be driven to rotate under the control of a control unit 21 (see FIG. 2 and the like) described later. Therefore, when the lower registration roller 14f is driven to rotate, the upper registration roller 14e pressed against the lower registration roller 14f is also rotated (so-called driven rotation).

  In this embodiment, as shown in FIG. 4, a plurality of upper registration rollers 14e are arranged in a conveyance orthogonal direction A3 that is in a direction along a plane parallel to the sheet P and orthogonal to the sheet conveyance direction A2 (in the example of FIG. 4). 4) are provided in parallel. Each upper registration roller 14e is provided on a single upper rotation shaft 14g extending in the conveyance orthogonal direction A3 with the axis of each other aligned, and is rotatable about the upper rotation shaft 14g. As shown in FIG. 7, the lower registration rollers 14f correspond to each of the upper registration rollers 14e, and a plurality of (four four) axes are aligned with a single lower rotation shaft 14h extending in the conveyance orthogonal direction A3. ) Are provided in parallel. Each of the lower registration rollers 14f is rotated at the same time around the lower rotation shaft 14h as the lower rotation shaft 14h is rotationally driven under the control of a control unit 21 (see FIG. 2 and the like) described later. Driven by rotation. Each of the lower registration rollers 14f is rotationally driven at a predetermined timing synchronized with the rotation of the printing drum 13a. Thereby, each lower registration roller 14f and each upper registration roller 14e sends the conveyed paper P to between the printing drum 13a and the press roller 13f (a nip portion 13g described later) (see FIG. 1 and the like). .

  As shown in FIG. 1, the press roller 13 f is disposed opposite to the printing drum 13 a below the printing drum 13 a in the printing unit 13, and can rotate about its own central axis (rotating shaft 13 h described later) as a rotation center. It is possible. The press roller 13f is pressed against the printing drum 13a (the outer peripheral surface thereof) by a pressing displacement mechanism 37 described later (see FIG. 2), and is separated from the printing drum 13a (the outer peripheral surface) (see FIG. 10). Is possible and supported. The press roller 13f is usually placed at a position away from the printing drum 13a. When the paper P reaches the printing drum 13a, the pressing roller 13f is lifted by a pressing displacement mechanism 37, which will be described later, and the outer peripheral surface of the printing drum 13a. Pressed against. Therefore, the paper P supplied between the printing drum 13a and the press roller 13f is pressed against the master 18 mounted on the outer peripheral surface of the printing drum 13a, and the ink that has oozed out from the perforated pattern portion of the master 18 is transferred. Relocated. For this reason, an ink image corresponding to an image formed by the punching pattern portion of the master 18 is printed on the paper P (a printed image is formed). A portion where the paper P is pressed against the outer peripheral surface of the printing drum 13a (the master 18 mounted thereon) by being sandwiched between the printing drum 13a and the press roller 13f is defined as a nip portion 13g. Thereby, the printing process in the printing part 13 is complete | finished. Therefore, the printing unit 13 functions as an image forming mechanism that forms a print image on the paper P. The paper P on which the print image is formed is sent to the paper discharge unit 15.

  The paper discharge unit 15 includes an air knife 19 and a transport unit 15a. The air knife 19 peels off the paper P attached to the printing drum 13a (master 18) with ink as the printing drum 13a rotates. The air knife 19 is fixedly provided at a position close to the printing drum 13a (the outer peripheral surface thereof) on the downstream side in the rotation direction of the printing drum 13a (the side on which the paper P on which the printed image is formed is sent). ing. As shown in FIG. 2, the air knife 19 has a fan 19a and a duct 19b. The fan 19a is a wind power generating unit that generates wind power when driven, and is driven and controlled by the control unit 21 described later. The duct 19b forms a flow of air toward the nip portion 13g along the outer peripheral surface of the printing drum 13a (the master 18 attached thereto) by wind power generated by the fan 19a (see FIG. 3A). ).

  The control unit 21 includes a storage unit 21a and a microcomputer. In the present embodiment, the control unit 21 is provided in the stencil printing apparatus 10 (its main body cabinet 10a (see FIG. 1)). For this reason, in this embodiment, the control unit 21 stores the driving processes in the document reading unit 11, the plate making unit 12, the printing unit 13, the paper feeding unit 14, the paper discharging unit 15, and the plate discharging unit 16 in the storage unit 21a. The program will be integrated. And the control part 21 of a present Example performs the drive process of the air knife 19, and the drive process of the pressing displacement mechanism 37 mentioned later, when performing an above-described drive process. Therefore, the air knife 19 (the fan 19a) is appropriately driven under the control of the control unit 21 to form an air flow to the nip portion 13g, that is, blows air to the nip portion 13g. Then, the control unit 21 causes the air knife 19 to continuously blow air onto the nip portion 13g while performing the above-described printing process.

  The driving of the air knife 19, that is, the blowing of air to the nip portion 13g, is started simultaneously with the rotation of the printing drum 13a. In the printing drum 13a, as described above, the press roller 13f is lifted by a pressing displacement mechanism 37 described later, thereby forming a nip portion 13g with the press roller 13f (see FIG. 3A). ). In the nip portion 13g, as shown in FIG. 3A, air flowing along the outer peripheral surface (master 18) of the printing drum 13a is blown by the air knife 19. In the nip portion 13g, as shown in FIG. 3B, as described above, the paper P sent out from the paper feeding portion 14 (between a lower movable guide plate 33 and an upper movable guide plate 34 described later) is fed. Guided and forms a printed image on the paper P. Thereafter, the paper P is discharged from the nip portion 13g, that is, between the printing drum 13a and the press roller 13f. The paper P is peeled off from the outer peripheral surface (master 18) of the printing drum 13a by the leading edge (front edge when moving) due to its stiffness (paper rigidity). Then, the air from the air knife 19 is blown into the gap between the peeled tip and the outer peripheral surface (master 18) of the printing drum 13a. Then, as shown in FIG. 3C, the paper P is continuously peeled from the outer peripheral surface (master 18) of the printing drum 13a by the air blown from the air knife 19 as the printing drum 13a rotates. It will be done. For this reason, the air knife 19 nips the sheet P from the downstream side in the rotation direction of the printing drum 13a (plate cylinder) in order to peel the sheet P from the printing drum 13a (plate cylinder (stencil paper (master 18) mounted thereon)). It functions as a blower mechanism that blows air onto the portion 13g, and the peeled paper P is transported by the transport unit 15a of the paper discharge section 15.

  As shown in FIG. 1, the transport unit 15a includes a transport belt 15d stretched between a suction paper discharge inlet roller 15b and a suction paper discharge roller 15c, and a suction fan disposed below the transport belt 15d. 15e. The transport unit 15a moves the transport belt 15d while pressing the paper P that has been peeled off from the printing drum 13a (master 18) onto the transport belt 15d by suction of the suction fan 15e. It is transported to be discharged to the storage device 22 (see arrow Cd). Hereinafter, the direction in which the paper P is conveyed and discharged is referred to as a paper discharge direction Cd. The transport unit 15a can adjust the discharge (transport) speed of the paper P and can be adjusted to the rotational speed of the printing drum 13a, that is, the printing speed.

  In the transport unit 15a, a seating member 15f is provided on the discharge (transport) path of the paper P by the transport belt 15d. The seating member 15f increases the apparent waist strength of the paper P by deforming it into a U shape so that the paper P being conveyed is curved when viewed in the paper ejection direction Cd. In the seating member 15f, the degree of curvature of the paper P can be appropriately changed according to the type of the paper P.

  The transport unit 15a deforms the paper P, which has been peeled off from the printing drum 13a (master 18) by the air knife 19, into a U-shape by the seating member 15f, and in the paper discharge direction Cd, the paper discharge storage device 22 (its discharge). The paper is discharged onto the paper base 22a). As will be described later, the paper discharge storage device 22 sequentially stacks and stores the paper P on which the print image discharged from the paper discharge unit 15 (the transport unit 15a), that is, the paper P that has been printed, is stacked. . Accordingly, the paper discharge unit 15 functions as a paper discharge mechanism that discharges the paper P on which the print image is formed in the paper discharge direction Cd.

  The plate discharging unit 16 includes a pair of peeling rollers 16a and 16b, a pair of peeling rollers 16c and 16d, a pair of conveying belts 16e and 16f, a plate discharging box 16g, and a compression plate 16h. The conveying belt pairs 16e and 16f are provided so as to be spanned between the peeling roller pairs 16a and 16b and the peeling roller pairs 16c and 16d, respectively. The plate removal box 16g is provided at the end of the pair of conveyor belts 16e and 16f. The compression plate 16h is provided so as to be movable in the vertical direction above the discharge box 16g. The conveyor belt pairs 16e and 16f peel off the used master 18 wound around the printing drum 13a (the outer peripheral surface) from the printing drum 13a as the printing drum 13a rotates in the direction opposite to the arrow A1. And discharged into the discharge box 16g. In the plate discharge box 16g, the used master 18 discharged is compressed by moving the compression plate 16h downward.

  In the stencil printing apparatus 10, an image reading process is performed by the document reading unit 11 on the document 17 set on the document tray 11f of the main body cabinet 10a, and a plate making process is performed by the plate making unit 12 based thereon. At this time, in the stencil printing apparatus 10, the used master 18 wound around the printing drum 13 a is discharged to the plate discharging unit 16 (plate discharging process), and the master 18 based on the image signal from the document reading unit 11 is used by the plate making unit 12. Plate making is performed (plate making process), and the master 18 after the plate making is wound around the printing drum 13a (plate feeding process). Further, in the stencil printing apparatus 10, at the time of printing, the paper P is sent out from the paper feeding unit 14 in synchronization with the master 18 wound around the printing drum 13a (paper feeding process), and the paper P is fed by the press roller 13f. Pressed against the master 18 of the printing drum 13a. As a result, the ink inside the printing drum 13a reaches the paper P via the master 18, and an image (print image) is formed on the paper P (printing process). Of these, the first printing is so-called plate printing in which the master 18 that has been subjected to plate making is brought into close contact with the printing drum 13a (outer peripheral surface) due to the adhesive force of the ink that has oozed out of the printing drum 13a (outer peripheral surface). The paper P on which the printed image is formed by the paper feeding process and the printing process is peeled off from the printing drum 13a (master 18) by the air knife 19 of the paper discharge unit 15 and discharged by the transport unit 15a of the paper discharge unit 15. The paper is discharged onto the paper storage device 22 (the paper discharge tray 22a) (paper discharge step). The discharged paper P is sequentially stacked and stored on the paper discharge storage device 22 (the paper discharge tray 22a). In the stencil printing apparatus 10, the document reading unit 11, the plate making unit 12, the printing unit 13, the paper feeding unit 14, the paper discharging unit 15, and the paper discharge unit 16 are appropriately driven under the control of the control unit 21. A series of operations are performed.

  The paper discharge accommodating device 22 is configured by providing a paper discharge end fence 22b and a pair of paper discharge side fences 22c (only one of them is shown in FIG. 1) on a paper discharge tray 22a. . The paper discharge accommodating device 22 (the paper discharge tray 22a) corresponds to the main body cabinet 10a (the paper discharge unit 15) corresponding to the paper discharge direction Cd in which the paper P is discharged from the paper discharge unit 15 (the transport unit 15a). The positional relationship is determined. The paper discharge tray 22a constitutes a place where the paper P discharged from the paper discharge unit 15 (the transport unit 15a) is stacked and stored, and has a flat plate shape as a whole. The paper discharge tray 22a is rotatably attached to the main body cabinet 10a via an attachment shaft provided in the main body cabinet 10a.

  The paper discharge end fence 22b is located on the paper discharge unit 15 (its transport unit 15a) side in the paper discharge direction Cd, that is, on the upstream side in the paper discharge direction Cd, and on the opposite end (downstream side in the paper discharge direction Cd). Is provided. The paper discharge end fence 22b has a flat plate shape as a whole, and is provided upright from the paper discharge table 22a. The paper discharge end fence 22b can be moved in the paper discharge direction Cd on the paper discharge tray 22a. The paper discharge end fence 22b is provided perpendicular to the paper discharge direction Cd, and is discharged from the paper discharge unit 15 (the transport unit 15a) to move the leading end of the paper P that moves in the paper discharge direction Cd ( It is possible to hit the front end face when moving in the paper discharge direction Cd. In addition, the paper discharge end fence 22b can be tilted inward and folded on the paper discharge table 22a by tilting inwardly with the rotation axis provided at the base portion standing up from the paper discharge table 22a as the rotation center. It is said that.

  The paper discharge side fences 22c are provided in pairs at both ends as viewed in the direction perpendicular to the paper discharge direction Cd in the paper discharge table 22a. Each sheet discharge side fence 22c has a flat plate shape as a whole, and is provided upright from the sheet discharge table 22a. Each of the paper discharge side fences 22c can be moved in a direction perpendicular to the paper discharge direction Cd on the paper discharge table 22a. Further, each paper discharge side fence 22c can be tilted inward and folded on the paper discharge table 22a by tilting it inwardly with a rotation axis provided at a base portion standing up from the paper discharge table 22a as a rotation center. it can. In this embodiment, each of the paper discharge side fences 22c is connected by a rack and pinion mechanism. When one of the paper discharge side fences 22c is moved, the other is also linked (when one is moved outward, the other is moved outward). It is configured. Note that both the paper discharge side fences 22c may be configured not to be linked to each other.

  The paper discharge end fence 22b and the paper discharge side fences 22c are arranged on the paper discharge table 22a according to the size of the paper P discharged from the paper discharge unit 15 (the transport unit 15a), that is, the printed paper P. The position is set as appropriate. In the paper discharge storage device 22, the paper discharge end fence 22b whose position is adjusted as described above on the paper discharge tray 22a for the paper P discharged from the paper discharge unit 15 (its transport unit 15a (see FIG. 1)). Are stacked and stored in an area surrounded by the paper discharge side fences 22c. Specifically, the paper P discharged from the paper discharge unit 15 (its transport unit 15a) hits the paper discharge end fence 22b, and both ends hit the paper discharge side fence 22c. The paper falls along (guided to) the paper discharge side fence 22c. As a result, the paper P is stacked on the paper discharge tray 22a with both end portions being in contact with the paper discharge side fences 22c. As a result, the discharged paper storage device 22 stacks and stores the discharged paper P.

  Next, a characteristic configuration of the paper feeding unit 14 in this embodiment of the present invention will be described. As described above, the sheet feeding section 14 drives the lower registration rollers 14f to rotate in synchronization with the rotation of the printing drum 13a, so that the lower registration rollers 14f and the upper registration rollers 14e use the paper. P is fed toward the nip portion 13g (between the printing drum 13a and the press roller 13f) in the paper transport direction A2. In the paper supply unit 14 of this embodiment, in order to more appropriately feed the paper P to the nip portion 13g, as shown in FIG. 2 and the like, the lower fixed guide plate 31, the upper fixed guide plate 32, and the lower movable guide are provided. A plate 33 and an upper movable guide plate 34 are provided.

  The lower fixed guide plate 31 and the upper fixed guide plate 32 have a plate shape having the same size and are arranged in parallel while facing each other in the vertical direction. The lower fixed guide plate 31 and the upper fixed guide plate 32 are fixed to the main body cabinet 10a (see FIG. 1). The upper fixed guide plate 32 and the lower fixed guide plate 31 allow the sheet P conveyed by the sheet feeding roller 14b and the pair of separation rollers 14c and 14d to pass between the upper registration rollers 14e and the lower registration rollers 14f. It is provided as a guide member facing in between. The upper fixed guide plate 32 and the lower fixed guide plate 31 cause the paper P to pass between the upper and lower registration rollers 14e and 14f by passing the paper P therebetween. The paper P can be transported in the paper transport direction A2. The distance between the lower fixed guide plate 31 and the upper fixed guide plate 32 is 2 mm in this embodiment.

  The lower fixed guide plate 31 is provided above the lower rotation shaft 14h that supports the lower registration rollers 14f and straddles the lower registration rollers 14f in the sheet conveyance direction A2 (FIG. 7 and the like). reference). The upper fixed guide plate 32 is provided below the upper rotation shaft 14g that supports each upper registration roller 14e so as to straddle each upper registration roller 14e in the sheet conveyance direction A2 (see FIG. 4 and the like). The lower fixed guide plate 31 has the same configuration as that of the upper fixed guide plate 32 except that the lower fixed guide plate 31 is provided across the lower registration rollers 14f in place of the disposed positions and the upper registration rollers 14e. Is reversed. Therefore, hereinafter, the configuration of the upper fixed guide plate 32 will be described, and the description of the configuration of the lower fixed guide plate 31 will be omitted.

  As shown in FIG. 4, the upper fixed guide plate 32 is provided with a plurality of roller window portions 32a arranged in parallel in the conveyance orthogonal direction A3. Each of the roller windows 32a allows at least a part of the upper registration roller 14e to protrude below the upper fixed guide plate 32, that is, toward the lower fixed guide plate 31 (see FIG. 2 and the like). ). In the present embodiment, four roller windows 32a are provided in parallel corresponding to the four upper registration rollers 14e, and a part of the upper registration roller 14e corresponding to each of them is provided on the upper fixed guide plate 32. Project downward. As a result, each upper registration roller 14e can rotate about the upper rotation shaft 14g provided above the upper fixed guide plate 32 and a part of the upper registration roller 14e protrudes below the upper fixed guide plate 32. ing. Similarly, each lower registration roller 14f is rotatable about an upper rotation shaft 14g provided below the lower fixed guide plate 31 as a center of rotation, and from the roller window 31a (see FIG. 7 etc.). The portion protrudes above the lower fixed guide plate 31 (see FIG. 2 and the like). Each upper registration roller 14e and each lower registration roller 14f are in contact with each other between the upper fixed guide plate 32 and the lower fixed guide plate 31, as shown in FIG.

  As a result, the sheet P conveyed by the sheet feeding roller 14b and the pair of separation rollers 14c and 14d (see FIG. 1) passes through the upper registration roller 14e and the lower registration guide 31 between the upper fixed guide plate 32 and the lower fixed guide plate 31, respectively. Guided to the side registration roller 14f. Here, the interval between the lower fixed guide plate 31 and the upper fixed guide plate 32 is set to 2 mm because the thickest paper used in the stencil printing apparatus 10 is set to 0.5 mm and the lower fixed guide plate 31 is used. The flatness accuracy between the upper fixed guide plate 32 and the upper fixed guide plate 32 is 0.5 mm, and the rest is a margin for smooth conveyance of the paper. The lower fixed guide plate 31 and the upper fixed guide plate 32 may be appropriately set as long as the thickest sheet can be smoothly guided, and is not limited to the above setting. . For example, when the thickness of the thickest sheet is 0.5 mm and the flatness accuracy between the lower fixed guide plate 31 and the upper fixed guide plate 32 is 0.5 mm as described above, the interval is sufficient. It is suitable to set to 1.5-2 mm collectively. For this reason, the paper P is conveyed by the paper supply roller 14b and the pair of separation rollers 14c and 14d, and is guided by the upper fixed guide plate 32 and the lower fixed guide plate 31, so that the smooth and appropriate state is achieved. Is sent between each upper registration roller 14e and each lower registration roller 14f. The upper registration rollers 14e and the lower registration rollers 14f are synchronized with the rotation of the printing drum 13a, and the paper P is directed toward the nip portion 13g (between the printing drum 13a and the press roller 13f) in the paper conveyance direction. Send to A2. Therefore, the upper registration rollers 14e, the lower registration rollers 14f, the upper fixed guide plate 32, and the lower fixed guide plate 31 are directed toward the nip portion 13g in accordance with the rotation of the plate cylinder (print drum 13a). It functions as a delivery mechanism for delivering the paper P.

  A lower movable guide plate 33 and an upper movable guide plate 34 are provided in order to appropriately guide the paper P to the nip portion 13g. Accordingly, as shown in FIG. 4, the upper fixed guide plate 32 is provided with three protruding side portions 32c at the downstream end portion 32b in the paper transport direction A2. Each protruding side 32c protrudes from the end 32b in the sheet conveying direction A2, in other words, is formed by partially extending the upper fixed guide plate 32. For this reason, at the end portion 32b of the upper fixed guide plate 32, the three protruding side portions 32c that protrude and the four concave portions 32d that are relatively recessed from the protruding side portion 32c therebetween and at both edges are alternately arranged. Yes. As a result, the end portion 32b of the upper fixed guide plate 32 is formed into a concavo-convex shape (so-called comb-tooth shape) by the three protruding side portions 32c and the four concave portions 32d. Similarly to the upper fixed guide plate 32, the lower fixed guide plate 31 arranged in parallel with the upper fixed guide plate 32 has a downstream end portion 31b formed by three projecting side portions 31c and four concave portions 31d. It is made into the uneven | corrugated shape (what is called a comb-tooth shape) (refer FIG. 7).

  The lower movable guide plate 33 is provided downstream of the lower fixed guide plate 31 in the paper transport direction A2 (see FIG. 2 and the like). As shown in FIG. 5, the lower movable guide plate 33 has a flat plate shape as a whole, and is provided with four protruding side portions 33b at the upstream end portion 33a in the paper transport direction A2. Each protruding side portion 33b protrudes from the end portion 33a in the sheet conveying direction A2, in other words, is formed by partially extending the lower movable guide plate 33. For this reason, at the end portion 33a of the lower movable guide plate 33, four projecting side portions 33b that protrude and five recessed portions 33c that are relatively recessed from the projecting side portion 33b in between and at both edges are alternately arranged. It is out. As a result, the end 33a of the lower movable guide plate 33 is formed into a concavo-convex shape (so-called comb-teeth shape) by the four protruding side portions 33b and the five concave portions 33c.

  As shown in FIG. 7, the four protruding side portions 33 b can be fitted with play into the four recessed portions 31 d of the lower fixed guide plate 31 when viewed in the vertical direction. In addition, the middle three concave portions 33c sandwiched between the respective protruding side portions 33b among the five concave portions 33c have play to the three protruding side portions 31c of the lower fixed guide plate 31 when viewed in the vertical direction. It is possible to fit. For this reason, as shown in FIGS. 2 and 7, the lower movable guide plate 33 butts the end portion 33 a against the end portion 31 b of the lower fixed guide plate 31 and inserts the concave portion and the convex portion into each other. The lower fixed guide plate 31 and the sheet conveying direction A2 can be arranged side by side. In other words, the lower movable guide plate 33 can be arranged side by side in the paper transport direction A2 in a state in which the respective concave and convex portions are overlapped in the transport orthogonal direction A3. As shown in FIG. 10, the lower movable guide plate 33 includes a protruding amount of the protruding side portion 33 b from the end portion 33 a and a protruding amount of the protruding side portion 31 c from the end portion 31 b of the lower fixed guide plate 31. If the distance is smaller than the interval added, even if the distance to the lower fixed guide plate 31 is increased, it is possible to maintain the state in which the concave portions and the convex portions are partially overlapped in the conveyance orthogonal direction A3. Thereby, even if the space | interval of the lower movable guide plate 33 and the lower fixed guide plate 31 is changed, the guide surface of the paper P formed by each can be continued in the paper transport direction A2 (FIG. 2 and FIG. 10).

  The lower movable guide plate 33 is provided with screw holes 33d at both edges located downstream in the paper transport direction A2 and in the transport orthogonal direction A3. Both screw holes 33d are formed by piercing the lower movable guide plate 33 in the vertical direction (thickness direction). Both screw holes 33d are provided to attach the spacer member 39 and the upper movable guide plate 34 to the lower movable guide plate 33, as will be described later (see FIG. 9). Both screw holes 33d can be fixed by meshing a screw member 41 (see FIG. 9 and the like) described later.

  Further, the lower movable guide plate 33 is provided with attachment side portions 33e at both edge portions located in the conveyance orthogonal direction A3. Each of the attachment side portions 33e is configured such that a portion where the edge portion of the lower movable guide plate 33 partially protrudes outward is bent downward. Both attachment side portions 33e are provided to attach the lower movable guide plate 33 to a pair of support arm portions 35 described later (see FIGS. 6 and 7). Both the mounting side portions 33e are provided with mounting holes 33f.

  The support arm portion 35 to which the attachment side portion 33e is attached supports the press roller 13f in a rotatable manner. As shown in FIGS. 6 and 7, both end positions when the press roller 13f is viewed in the conveyance orthogonal direction A3. It is provided in pairs. Each of the support arm portions 35 has a long plate shape, and is provided with a screw hole 35a, a first support hole 35b, and a second support hole 35c. The screw hole 35a can be fixed by meshing a screw member 38 (see FIG. 7 and the like) described later. The first support hole 35b is provided so as to penetrate the support arm portion 35 in the conveyance orthogonal direction A3, and can rotatably support the rotation shaft 13h provided in the press roller 13f. Therefore, the pair of support arm portions 35 can rotatably support the press roller 13f through the first support hole 35b and the rotation shaft 13h. In addition, the structure by which the rotating shaft 13h is rotatably passed with respect to the press roller 13f may be sufficient.

  The second support hole 35c is provided so as to penetrate the support arm portion 35 in the conveyance orthogonal direction A3, and can receive the fulcrum shaft 36 rotatably. The fulcrum shaft 36 extends in the conveyance orthogonal direction A3 and is fixed to the main body cabinet 10a (see FIG. 1). Therefore, the pair of support arm portions 35 can rotate around the fulcrum shaft 36 as the rotation center in the main body cabinet 10a. In the pair of support arm portions 35, a rotatable range around the fulcrum shaft 36 is regulated by a pressing displacement mechanism 37. The pushing displacement mechanism 37 rotates the pair of support arm portions 35 around the fulcrum shaft 36 as a center of rotation, thereby pushing the support arm portions 35 into a pushing position (see FIG. 2) and a retreating position (see FIG. (See below). In other words, the pressing displacement mechanism 37 displaces the pair of support arm portions 35 between the pressing position (see FIG. 2) and the retracted position (see FIG. 10). In this embodiment, the pushing displacement mechanism 37 is driven by the control unit 21, and the driving force from the driving unit is pushed between the pushing positions (see FIG. 2) and the retreating position (see FIG. 2). And a cam mechanism that converts it into a moving force. For this reason, the pushing displacement mechanism 37 displaces both the supporting arm portions 35 between the pushing position (see FIG. 2) and the retracted position (see FIG. 10) under the control of the control unit 21.

  The pushing position (see FIG. 2) and the retracted position (see FIG. 10) will be described. The pair of support arm portions 35 can rotate around the fulcrum shaft 36 to press the press roller 13f rotatably supported against the outer peripheral surface (master 18) of the printing drum 13a (see FIG. 2). The position of the pair of support arm portions 35 in such a state is set as a pressing position.

  In the printing drum 13a, a master clamper 13e for clamping (holding) the master 18 is provided on a part of the outer peripheral surface. For this reason, on the outer peripheral surface of the printing drum 13a, when the printing drum 13a is rotationally driven, the master clamper 13e relatively moves in the rotational direction. Since the master clamper 13e is provided on the outer peripheral surface of the printing drum 13a and clamps (holds) the master 18 wound around the master drum 13e, the master clamper 13e extends outward in the radial direction with respect to the outer peripheral surface of the printing drum 13a. It is protruding. For this reason, on the outer peripheral surface of the printing drum 13a, the master clamper 13e that protrudes every rotation is rotated as the printing drum 13a rotates (see FIGS. 2, 10, and 11). The trajectory (T) through which the master clamper 13e passes is formed on the outer side in the radial direction with respect to the outer peripheral surface of the printing drum 13a. In FIG. 2, FIG. 10, and FIG. 11, the location located most radially outside of this locus is indicated by a two-dot chain line, and a reference symbol T is given.

  For this reason, in order to avoid interference with the master clamper 13e, the press roller 13f needs to be retracted radially outward from the locus T every time the printing drum 13a is rotated once (see FIG. 10). For this reason, the pair of support arm portions 35 rotate around the fulcrum shaft 36 to rotate the press roller 13f that rotatably supports the outer peripheral surface (master) of the printing drum 13a radially outward from the locus T. 18) (see FIG. 10). A position of the pair of support arm portions 35 in such a state is set as a retracted position. For this reason, the pressing displacement mechanism 37 moves both the supporting arm portions 35 to the pressing position (see FIG. 2) and the retracted position (see FIG. 10) every time the printing drum 13a rotates once under the control of the control unit 21. ).

  As shown in FIG. 7, a lower movable guide plate 33 is attached to both the support arm portions 35. In the lower movable guide plate 33, screw members 38 are passed through the attachment holes 33f of the attachment side portions 33e, and the screw members 38 are fixed to the corresponding screw holes 35a of the support arm portions 35 by meshing. Thus, it is attached to the support arm portion 35. Therefore, when the pair of support arm portions 35 are displaced between the pressing position (see FIG. 2) and the retracted position (see FIG. 10), the lower movable guide plate 33 is integrated with the displacement. Move to. An upper movable guide plate 34 is provided above the lower movable guide plate 33 (see FIG. 2 and the like).

  The upper movable guide plate 34 is provided on the downstream side of the upper fixed guide plate 32 in the sheet conveyance direction A2 (see FIG. 2 and the like). As shown in FIG. 8, the upper movable guide plate 34 has a plate shape and is curved to warp upward when viewed in the conveyance orthogonal direction A3. The upper movable guide plate 34 is provided with four protruding side portions 34b at the upstream end portion 34a in the paper transport direction A2. Each protruding side 34b protrudes from the end 34a in the sheet conveyance direction A2 (strictly, the direction along the curve), in other words, is formed by partially extending the upper movable guide plate 34. For this reason, at the end portion 34a of the upper movable guide plate 34, four protruding side portions 34b and five concave portions 34c that are relatively recessed from the protruding side portion 34b in between and at both edges are alternately arranged. Yes. As a result, the end portion 34a of the upper movable guide plate 34 is formed into a concavo-convex shape (so-called comb-teeth shape) by the four protruding side portions 34b and the five concave portions 34c.

  As shown in FIG. 4, the four protruding side portions 34 b can be fitted with play into the four recessed portions 32 d of the upper fixed guide plate 32 when viewed in the vertical direction. Further, the middle three concave portions 34c sandwiched between the respective protruding side portions 34b among the five concave portions 34c have play to the three protruding side portions 32c of the upper fixed guide plate 32 when viewed in the vertical direction. It is possible to fit. For this reason, as shown in FIGS. 2 and 4, the upper movable guide plate 34 has its end portion 34a abutted against the end portion 32b of the upper fixed guide plate 32 so that the concave portion and the convex portion are fitted into each other. The upper fixed guide plate 32 and the sheet conveying direction A2 can be arranged side by side. In other words, the upper movable guide plate 34 can be arranged side by side in the paper transport direction A2 in a state in which the respective concave and convex portions are overlapped in the transport orthogonal direction A3. Then, as shown in FIG. 10, the upper movable guide plate 34 adds the protruding amount of the protruding side portion 34b from the end portion 34a and the protruding amount of the protruding side portion 32c from the end portion 32b of the upper fixed guide plate 32. If the distance is smaller than the interval, even if the distance to the upper fixed guide plate 32 is widened, it is possible to maintain the state in which the concave portions and the convex portions are partially overlapped in the conveyance orthogonal direction A3. As a result, the upper movable guide plate 34 and the upper fixed guide plate 32 can continue the guide surfaces of the paper P formed by them in the paper transport direction A2 even if the distance between them is changed (FIG. 2 and FIG. 2). (See FIG. 10).

  The upper movable guide plate 34 is provided with mounting holes 34d on both edges located downstream in the paper transport direction A2 and in the transport orthogonal direction A3. Both the mounting holes 34d are formed so as to penetrate the upper movable guide plate 34 in the vertical direction (thickness direction). As shown in FIG. 9, the upper movable guide plate 34 is attached to the lower movable guide plate 33 via a spacer member 39. The spacer member 39 defines the distance between the upper movable guide plate 34 and the lower movable guide plate 33 at the downstream end portion (end portion on the nip portion 13g side) in the paper transport direction A2. In this embodiment, the spacer member 39 has a thin plate shape, and is provided with a mounting hole 39a (see FIG. 9) that allows a screw member 41 described later to pass therethrough.

  On the lower movable guide plate 33, as shown in FIG. 6 and FIG. 9, spacer members 39 are arranged at both edges located downstream in the paper transport direction A2 and in the transport orthogonal direction A3. An upper movable guide plate 34 is disposed on both spacer members 39. Then, from above the upper movable guide plate 34, through both the mounting holes 34d and the mounting holes 39a of the spacer members 39 (see FIG. 9), the screw members 41 are respectively inserted into the both screw holes 33d of the lower movable guide plate 33. Is fixed by meshing. As a result, the upper movable guide plate 34 is attached above the lower movable guide plate 33 via both spacer members 39 provided at both edges on the downstream side in the paper transport direction A2. The pair of spacer members 39 (screw members 41) are arranged between the lower movable guide plate 33 and the upper movable guide plate 34 in the direction perpendicular to the conveyance direction than the largest sheet of paper used in the stencil printing apparatus 10. It is supposed to be located outside A3. Therefore, the spacer members 39 (screw members 41) are prevented from interfering with the paper P guided by the lower movable guide plate 33 and the upper movable guide plate 34. Accordingly, both screw members 41 are positioned outside the outer peripheral surface (master 18) of the printing drum 13a in the conveyance orthogonal direction A3 (see FIGS. 4 and 6). Therefore, although both screw members 41 are shown in the inner side of a trajectory T described later in FIG. 10, they do not interfere with the outer peripheral surface (master 18) of the printing drum 13a and the master clamper 13e. .

  For this reason, the lower movable guide plate 33 and the upper movable guide plate 34 are juxtaposed in parallel, and the interval on the downstream side in the paper transport direction A2 is defined by the thickness dimension of both spacer members 39. Further, since the lower movable guide plate 33 has a flat plate shape, the upper movable guide plate 34 is curved so as to bend upward, so that the lower movable guide plate 33 and the upper movable guide plate 33 are movable upward. The distance from the guide plate 34 gradually increases toward the upstream side in the sheet conveyance direction A2. In this embodiment, the distance between the lower movable guide plate 33 and the upper movable guide plate 34 is 2 mm, which is the thickness dimension of each spacer member 39 on the downstream side (the end thereof), and the upstream side (the end portion thereof). ) Is 5 to 8 mm (7 mm in this example). This is because the thickest paper used in the stencil printing apparatus 10 is set to 0.5 mm, and the waviness that can occur on the paper is set to 1.0 mm as described later, and the lower movable guide plate 33 and the upper movable plate are movable. This is because the flatness accuracy with respect to the guide plate 34 is 0.5 mm. For this reason, the lower movable guide plate 33 and the upper movable guide plate 34 can smoothly guide the paper P sent out in the paper transport direction A2. The distance between the lower movable guide plate 33 and the upper movable guide plate 34 on the downstream side is the sheet used for the stencil printing apparatus 10 and its undulation, and the lower movable guide plate 33 and the upper movable guide plate 34. May be set as appropriate according to the flatness accuracy. However, the distance between the lower movable guide plate 33 and the upper movable guide plate 34 on the downstream side is set to 2 mm or less from the viewpoint of effectively suppressing the influence of air blown by the air knife 19 as will be described later. It is desirable.

  The lower movable guide plate 33 and the upper movable guide plate 34 are fixed to each other via both spacer members 39, and the lower movable guide plate 33 is attached to the support arm portion 35 as described above. Therefore, it is fixed to the support arm portion 35. As described above, the support arm portion 35 can be displaced between the pressing position (see FIG. 2) and the retracted position (see FIG. 10) by rotation about the fulcrum shaft 36. The lower movable guide plate 33 and the upper movable guide plate 34 are a support arm portion 35 that is displaced between a pressing position and a retracted position, and a lower fixed guide fixed to the main body cabinet 10a (see FIG. 1). The positions of the plate 31 and the upper fixed guide plate 32 are set so as to satisfy the following conditions.

  First, as shown in FIGS. 2 and 10, the lower movable guide plate 33 is arranged side by side with the lower fixed guide plate 31 and the paper transport direction A2 while fitting the concave portions and the convex portions into each other. The lower movable guide plate 33 has a downstream end in the paper transport direction A2 close to a press roller 13f (a nip portion 13g formed between the press roller 13f and the print drum 13a). Regardless of the displacement of the support arm portion 35, the lower movable guide plate 33 maintains a state in which at least a part of each concave portion and convex portion is overlapped in the conveyance orthogonal direction A3 with the lower fixed guide plate 31. It is supposed to be. In this embodiment, when the support arm portion 35 is in the pressing position, the lower movable guide plate 33 fits the concave portion and the convex portion between the lower movable guide plate 33 and the lower fixed guide plate 31 (see FIG. 2). Further, when the support arm portion 35 is in the retracted position, the lower movable guide plate 33 partially overlaps the concave portion and the convex portion with the lower fixed guide plate 31 in the conveyance orthogonal direction A3. State (see FIG. 10). Thus, the lower movable guide plate 33 uses the guide surface of the paper P formed by itself and the guide surface of the paper P formed by the lower fixed guide plate 31 regardless of the displacement of the support arm portion 35. It can be continued in the transport direction A2. The lower movable guide plate 33 has an end portion 33a (an upstream end portion in the paper conveyance direction A2) that satisfies the above-described conditions, and an end portion 31b (downstream in the paper conveyance direction A2) of the lower fixed guide plate 31. It is supposed to be located lower than the side end). As a result, the lower movable guide plate 33 is fed to the paper P fed in the paper transport direction A2 on the guide surfaces that are continuous with the lower fixed guide plate 31 regardless of the displacement of the support arm portion 35. It is prevented that the paper is caught, that is, the feeding of the paper P in the paper transport direction A2 is inhibited. In addition, when the support arm portion 35 is in the retracted position, the lower movable guide plate 33 is retracted radially outward from the locus T of the master clamper 13e together with the support arm portion 35 ( (See FIG. 10).

  The upper movable guide plate 34 is arranged side by side with the upper fixed guide plate 32 in the paper transport direction A2 while fitting the concave and convex portions of each other. The upper movable guide plate 34 has a downstream end portion in the paper transport direction A2 that is close to the press roller 13f (a nip portion 13g formed between the press roller 13f and the printing drum 13a). The upper movable guide plate 34 maintains a state in which at least a part of each concave portion and convex portion is overlapped in the conveyance orthogonal direction A3 with the upper fixed guide plate 32 regardless of the displacement of the support arm portion 35. It is said that. In the present embodiment, when the support arm portion 35 is in the pressing position, the upper movable guide plate 34 is fitted between the concave portion and the convex portion with the upper fixed guide plate 32 (see FIG. 2). ). At this time, the upper movable guide plate 34 is brought close to the nip portion 13g without the downstream end portion in the paper transport direction A2 interfering with the printing drum 13a. In addition, when the support arm portion 35 is in the retracted position, the upper movable guide plate 34 is partially overlapped with the upper fixed guide plate 32 in the conveyance orthogonal direction A3. (See FIG. 10). Accordingly, the upper movable guide plate 34 moves the guide surface of the paper P formed by itself and the guide surface of the paper P formed by the upper fixed guide plate 32 regardless of the displacement of the support arm portion 35 in the paper transport direction. A2 can be continued. The upper movable guide plate 34 has an end portion 34a (an upstream end portion in the paper transport direction A2) that satisfies the above-described conditions, while an end portion 32b (the downstream side in the paper transport direction A2) of the upper fixed guide plate 32. It is supposed to be located above the end portion. As a result, the upper movable guide plate 34 is caught by the paper P fed in the paper transport direction A2 on the guide surfaces that are continuous with the upper fixed guide plate 32 regardless of the displacement of the support arm portion 35. That is, it is possible to prevent the paper P from being fed in the paper transport direction A2. In addition, when the support arm portion 35 is in the retracted position, the upper movable guide plate 34 is retracted together with the support arm portion 35 to the outside in the radial direction from the locus T of the master clamper 13e (FIG. 10).

  Therefore, the lower movable guide plate 33 and the upper movable guide plate 34 are arranged at the downstream end in the sheet conveying direction A2, that is, the nip, with the displacement between the pressing position of the press roller 13f and the retracted position. The end on the part 13g side is displaced. As shown in FIG. 2, the lower movable guide plate 33 and the upper movable guide plate 34 are transported when the support arm portion 35 is in the pressing position and the press roller 13f is pressed against the printing drum 13a. A downstream end portion (end portion on the nip portion 13g side) in the direction A2 is brought close to the nip portion 13g. Between the lower movable guide plate 33 and the upper movable guide plate 34, while being guided by the lower fixed guide plate 31 and the upper fixed guide plate 32, each upper registration roller 14e and each lower registration roller 14f. The conveyed paper P is smoothly guided. The lower movable guide plate 33 and the upper movable guide plate 34 can reliably guide the paper P guided therebetween to the front end portion close to the nip portion 13g. It can be sent out properly.

  Further, as shown in FIG. 10, the lower movable guide plate 33 and the upper movable guide plate 34 are arranged such that the support arm portion 35 is in the retracted position and the press roller 13f is moved outward in the radial direction from the locus T. When separated from 13 a, it retreats outward in the radial direction from the trajectory T. For this reason, the lower movable guide plate 33 and the upper movable guide plate 34 can avoid interference with the master clamper 13e that goes around every round together with the press roller 13f. After that, the support arm unit 35 is pushed from the retracted position so as to press the press roller 13f against the printing drum 13a as shown in FIG. 11 by driving the pressing displacement mechanism 37 under the control of the control unit 21. It is displaced towards the position. Since the lower movable guide plate 33 and the upper movable guide plate 34 are in the above-described positional relationship with the lower fixed guide plate 31 and the upper fixed guide plate 32, the transition from the retracted position to the pushing position is in progress. Even so, the paper P guided by the lower fixed guide plate 31 and the upper fixed guide plate 32 can be smoothly guided inward. From this, the lower movable guide plate 33 and the upper movable guide plate 34 are configured so that when the press roller 13f is pressed against the printing drum 13a and the nip portion 13g is formed, the paper P is appropriately transferred to the nip portion 13g immediately. Can be sent out.

  Next, in order to peel the paper P from the printing drum 13a (plate cylinder (stencil paper (master 18) mounted thereon)), air is supplied to the nip portion 13g from the downstream side in the rotation direction of the printing drum 13a (plate cylinder). A technical problem in the stencil printing apparatus provided with a blowing mechanism (air knife 19 in the illustrated example) is described using the stencil printing apparatus 50 shown in Fig. 12. The stencil printing apparatus 50 is described above. The lower movable guide plate 33 and the upper movable guide plate 34 (including a structure for attaching them) are removed from the printing apparatus 10. This is because the problem of this technique is that the lower movable guide plate 33 and the upper movable guide plate 33 are arranged on the upper side. If the movable guide plate 34 is not provided, the same problem occurs in the above-described stencil printing apparatus 10. Therefore, in the stencil printing apparatus 50, the stencil printing apparatus 10 and The same reference numerals are assigned to the new parts, and detailed description thereof is omitted, with the vibration (waving) occurring at the front end of the paper P being highlighted for easy understanding. However, it does not necessarily match the actual mode.

  In the stencil printing apparatus 50, the air knife 19 causes air to flow along the outer peripheral surface (master 18) of the printing drum 13a and blows air to the nip portion 13g. As described above, the air knife 19 blows air onto the nip portion 13g continuously during the printing process. For this reason, when the support arm portion 35 is in the pressing position, that is, when the press roller 13f is pressed against the printing drum 13a, the air from the air knife 19 is blown against the nip portion 13g. However, when the support arm portion 35 is displaced toward the retracted position, that is, when the press roller 13f is separated from the printing drum 13a, the air from the air knife 19 passes between the press roller 13f and the printing drum 13a. The lower fixed guide plate 31 and the upper fixed guide plate 32 are blown against the downstream end portions (the end portion 31b and the end portion 32b) in the paper transport direction A2 (see arrow A10). The press roller 13f forms a gap with the printing drum 13a even during the transition from the retracted position of the support arm portion 35 to the pressing position.

  For this reason, at the downstream end portions (end portion 31b and end portion 32b) of the lower fixed guide plate 31 and the upper fixed guide plate 32, the support arm portion 35 (press roller 13f) is moved from the retracted position to the pressed position. During the transition, the air from the air knife 19 arrives. The lower fixed guide plate 31 and the upper fixed guide plate 32 nip the downstream end portions (end portion 31b, end portion 32b) from the viewpoint of avoiding interference with the master clamper 13e that goes around every round. There is a limit to disposing it close to the portion 13g. For this reason, when the sheet P is guided by the lower fixed guide plate 31 and the upper fixed guide plate 32 and is sent out from the downstream ends (end portion 31b and end portion 32b) during the above-described transition, Air from the knife 19 is blown (see arrow A10). Then, at the leading end of the paper P, vibration (rippling) due to blowing occurs, and a force that separates (floats) from the outer peripheral surface (master 18) of the printing drum 13a approaching toward the nip portion 13g acts. There is a risk of it.

  Then, the sheet P may not reach the nip portion 13g in an appropriate state. In the stencil printing apparatus 50 (stencil printing apparatus 10), if the paper P cannot reach the nip portion 13g in an appropriate state, it is difficult to set the position (image position) where the printed image is formed on the paper P to a predetermined position. End up. This is because, in the printing process, when a large number of copies are printed, the paper P is successively sent out to the nip portion 13g, so that a print image is formed between each discharged paper P. There is a risk of variations in position. Such a variation causes color misregistration when the stencil printing apparatus 50 (stencil printing apparatus 10) is configured to perform multicolor printing by sending the stencil printing apparatus 50 (stencil printing apparatus 10) a plurality of times to the nip portion 13g.

  On the other hand, in the stencil printing apparatus 10 of the present embodiment, the lower movable guide plate 33 and the upper movable guide plate 34 are disposed downstream of the lower fixed guide plate 31 and the upper fixed guide plate 32 in the paper transport direction A2. Is continuous. For this reason, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 guide the paper P to a position very close to the outer peripheral surface (master 18) of the printing drum 13a forming the nip portion 13g. be able to. Thereby, in the stencil printing apparatus 10, even if the air from the air knife 19 blows to the downstream end portions (end portion 31b, end portion 32b) of the lower fixed guide plate 31 and the upper fixed guide plate 32, The lower movable guide plate 33 and the upper movable guide plate 34 can prevent the leading end of the paper P from floating or wavy. Therefore, the stencil printing apparatus 10 can feed the paper P to the nip portion 13g in an appropriate state even if a blower mechanism for peeling the paper from the plate cylinder by blowing air is provided.

  Further, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 can be separated from the printing drum 13a radially outward from the trajectory T together with the press roller 13f. For this reason, the stencil printing apparatus 10 can guide the paper P to a position very close to the nip portion 13g on the inner side in the radial direction from the trajectory T, while preventing interference with the master clamper 13e that goes around every round. It can certainly be avoided. In other words, the lower movable guide plate 33 and the upper movable guide plate 34 can be separated from the printing drum 13a radially outward from the trajectory T together with the press roller 13f, so that they are very close to the nip portion 13g. It is possible to guide the paper P to the position.

  Further, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 are displaced together with the press roller 13f. For this reason, in the stencil printing apparatus 10, the downstream end portion (the end portion on the nip portion 13g side) of the lower movable guide plate 33 and the upper movable guide plate 34 in the sheet transport direction A2 is always positioned in the vicinity of the press roller 13f. Can be made. Thereby, in the stencil printing apparatus 10, the downstream side in the sheet conveyance direction A2 between the lower movable guide plate 33 and the upper movable guide plate 34 until the press roller 13f is pressed against the outer peripheral surface (master 18) of the printing drum 13a. Can be separated from the outer peripheral surface (master 18) of the printing drum 13a. Here, in the stencil printing apparatus 10, the air from the air knife 19 flows along the outer peripheral surface (master 18) of the printing drum 13a and is blown to the nip portion 13g. Therefore, in the stencil printing apparatus 10, the influence of the air blown by the air knife 19 on the paper P existing between the lower movable guide plate 33 and the upper movable guide plate 34 can be made extremely small. Further, it is possible to more effectively prevent the leading end of the paper P from undulating.

  In the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable plate are moved by the driving force from the pressing displacement mechanism 37 for displacing the press roller 13f (the pair of support arm portions 35) between the pressing position and the retracted position. The guide plate 34 can be displaced. For this reason, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 can be displaced together with the press roller 13f with a simple configuration, and they can be integrated.

  In the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 are fixed to a support arm portion 35 that supports the press roller 13f to be displaced between a pressing position and a retracted position. Therefore, in the stencil printing apparatus 10, the positional relationship between the lower movable guide plate 33 and the upper movable guide plate 34 with respect to the press roller 13f can be set to a predetermined state regardless of the displacement of the support arm portion 35. Thereby, in the stencil printing apparatus 10, the paper P can be guided to a position very close to the nip portion 13g formed by pressing the press roller 13f against the outer peripheral surface (master 18) of the printing drum 13a. Further, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 can be displaced together with the press roller 13f with a simple configuration, and these can be integrated.

  In the stencil printing apparatus 10, the paper P conveyed by the upper registration rollers 14e and the lower registration rollers 14f is guided upstream in the paper conveyance direction A2 between the lower movable guide plate 33 and the upper movable guide plate 34. The lower fixed guide plate 31 and the upper fixed guide plate 32 are made continuous. For this reason, in the stencil printing apparatus 10, the paper P sent out at a predetermined timing synchronized with the rotation of the printing drum 13a by each upper registration roller 14e and each lower registration roller 14f is sent out stably to the nip portion 13g. be able to.

  In the stencil printing apparatus 10, the downstream distance between the lower movable guide plate 33 and the upper movable guide plate 34 in the paper transport direction A2 is set to 2 mm or less (2 mm in the above-described embodiment). For this reason, in the stencil printing apparatus 10, the influence of the air blown by the air knife 19 on the paper P existing between the lower movable guide plate 33 and the upper movable guide plate 34 can be made extremely small. Thereby, in the stencil printing apparatus 10, it can prevent more effectively that the front-end | tip part of the paper P undulates.

  In the stencil printing apparatus 10, the distance between the lower movable guide plate 33 and the upper movable guide plate 34 in the paper transport direction A2 is wider than the downstream distance (in the above embodiment, the range is 5 to 8 mm). And 7 mm). Therefore, in the stencil printing apparatus 10, the paper P guided by the lower fixed guide plate 31 and the upper fixed guide plate 32 is reliably sent out between the lower movable guide plate 33 and the upper movable guide plate 34. be able to.

  In the stencil printing apparatus 10, both spacer members 39 are interposed between the lower movable guide plate 33 and the upper movable guide plate 34 at the downstream end portion (the end portion on the nip portion 13g side) in the paper transport direction A2. Thus, the interval between the lower movable guide plate 33 and the upper movable guide plate 34 is defined. For this reason, in the stencil printing apparatus 10, the interval between the downstream end portion (the end portion on the nip portion 13g side) of the lower movable guide plate 33 and the upper movable guide plate 34 is set with a simple configuration and more accurately. Can do.

  In the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 33 and the upper movable guide plate 33 are formed in a flat plate shape and the upper movable guide plate 34 is curved so as to bend upward. The distance on the upstream side with respect to the guide plate 34 in the sheet conveyance direction A2 is made wider than the distance on the downstream side. For this reason, in the stencil printing apparatus 10, the interval between the lower movable guide plate 33 and the upper movable guide plate 34 can be set with a simple configuration.

  In the stencil printing apparatus 10, a concave portion and a convex portion that can be fitted into each other are provided in the end portion 33 a of the lower movable guide plate 33 and the end portion 31 b of the lower fixed guide plate 31. For this reason, in the stencil printing apparatus 10, the lower movable guide is fitted while the end 33 a of the lower movable guide plate 33 and the end 31 b of the lower fixed guide plate 31 are brought into contact with each other and the respective concave and convex portions are fitted. The plate 33 and the lower fixed guide plate 31 can be arranged side by side in the sheet conveyance direction A2. Thereby, in the stencil printing apparatus 10, even when the distance to the lower fixed guide plate 31 of the lower movable guide plate 33 is increased, the state in which the concave portions and the convex portions are partially overlapped in the conveyance orthogonal direction A3 is maintained. be able to. Therefore, in the stencil printing apparatus 10, even if the distance between the lower movable guide plate 33 and the lower fixed guide plate 31 is changed, the guide surface of the paper P formed by each can be continued in the paper transport direction A2. .

  In the stencil printing apparatus 10, a concave portion and a convex portion that can be fitted to each other are provided in the end portion 34 a of the upper movable guide plate 34 and the end portion 32 b of the upper fixed guide plate 32. For this reason, in the stencil printing apparatus 10, the upper movable guide plate 34 and the upper movable guide plate 34 are fitted to the end portion 34a of the upper movable guide plate 34 and the end portion 32b of the upper fixed guide plate 32 so that the concave portions and the convex portions are fitted. The upper fixed guide plate 32 can be arranged side by side in the sheet conveyance direction A2. Thereby, in the stencil printing apparatus 10, even when the distance from the upper movable guide plate 34 to the upper fixed guide plate 32 is increased, it is possible to maintain the state in which the concave portions and the convex portions are partially overlapped in the conveyance orthogonal direction A3. it can. Therefore, in the stencil printing apparatus 10, even if the distance between the upper movable guide plate 34 and the upper fixed guide plate 32 is changed, the guide surface of the paper P formed by each can be continued in the paper transport direction A2.

  In the stencil printing apparatus 10, even if the lower movable guide plate 33 and the lower fixed guide plate 31, and the upper movable guide plate 34 and the upper fixed guide plate 32 change their distances, the mutual guide surfaces are conveyed by the sheet. It can be continued in the direction A2. Therefore, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 are displaced with respect to the lower fixed guide plate 31 and the upper fixed guide plate 32 fixed to the main body cabinet 10a. Also, it is possible to prevent the mutual guide surfaces from being divided. Thereby, in the stencil printing apparatus 10, the lower movable guide plate 33 and the upper movable guide plate 34 are separated from the printing drum 13a radially outward from the trajectory T in order to avoid interference with the master clamper 13e. Also, the paper P can be guided appropriately.

  In the stencil printing apparatus 10, the end 33 a of the lower movable guide plate 33 is positioned below the end 31 b of the lower fixed guide plate 31. For this reason, in the stencil printing apparatus 10, regardless of the displacement of the support arm portion 35, the guide surfaces that are continuous with each other between the lower movable guide plate 33 and the lower fixed guide plate 31 move in the paper transport direction A2. It is possible to prevent the paper P from being caught, that is, hindering the paper P from being fed in the paper conveyance direction A2.

  In the stencil printing apparatus 10, the end portion 34 a of the upper movable guide plate 34 is positioned above the end portion 32 b of the upper fixed guide plate 32. For this reason, in the stencil printing apparatus 10, regardless of the displacement of the support arm portion 35, the sheet is fed in the sheet conveyance direction A <b> 2 on the guide surfaces continuous between the upper movable guide plate 34 and the upper fixed guide plate 32. It is possible to prevent the sheet P from being caught, that is, preventing the sheet P from being fed in the sheet conveyance direction A2.

  In the stencil printing apparatus 10, since the upper movable guide plate 34 is curved so as to bend upward, the air from the air knife 19 is transferred to the outer peripheral surface of the printing drum 13a by the upper movable guide plate 34 (the upper surface). It can escape to the (master 18) side. For this reason, in the stencil printing apparatus 10, the influence of the air blown by the air knife 19 on the paper P existing between the lower movable guide plate 33 and the upper movable guide plate 34 can be made extremely small. It is possible to more effectively prevent the leading end of the paper P from undulating.

  In the stencil printing apparatus 10, the upper movable guide plate 34 is formed in a plate shape that curves so as to warp upward, and therefore, when separated from the printing drum 13 a radially outward from the trajectory T, it follows the trajectory T. State. Therefore, in the stencil printing apparatus 10, the upper movable guide plate 34 can be present on the radially outer side from the trajectory T while suppressing the displacement amount of the upper movable guide plate 34.

  In the stencil printing apparatus 10, the paper P can be sent out to the nip portion 13 g in an appropriate state. Therefore, there is a variation in the position (image position) where the printed image is formed between each discharged paper P. Can be prevented. For this reason, the stencil printing apparatus 10 can prevent the occurrence of color misregistration when it is configured to perform multicolor printing by sending it to the nip portion 13g a plurality of times.

  Therefore, in the stencil printing apparatus 10 of the present embodiment according to the present invention, even if a blower mechanism (in the above-described embodiment, the air knife 19) is used to peel the paper P from the printing drum 13a serving as a plate cylinder, it is in an appropriate state. Thus, the paper P can be fed into the nip portion 13g.

  In the above-described embodiment, the stencil printing apparatus 10 as an example of the stencil printing apparatus according to the present invention has been described. However, the stencil sheet is mounted on the outer periphery and rotated, and pressed against the stencil cylinder. And a pressing roller that is displaceable between a pressing position that forms a nip portion and a retreat position that is spaced apart from the plate cylinder, and a sheet of paper toward the nip portion as the plate cylinder rotates. A feeding mechanism that feeds out, a blower mechanism that blows air to the nip portion from the downstream side in the rotation direction of the plate cylinder, and a sheet that is fed by the feeding mechanism are arranged in close proximity to guide the paper to the nip portion. A lower movable guide plate and an upper movable guide plate, and the lower movable guide plate and the upper movable guide plate may be any stencil printing apparatus that is displaced in accordance with the displacement of the press roller. Fruit It is not limited to the example.

  In the above-described embodiment, the lower movable guide plate 33 and the upper movable guide plate 34 are attached to the support arm portion 35 that is rotatable about the fulcrum shaft 36 and supports the press roller 13f. . However, the lower movable guide plate 33 and the upper movable guide plate 34 are displaced in accordance with the displacement of the press roller 13f, and more preferably, the lower movable guide plate 33 and the upper movable guide plate 34 are downstream in the sheet conveyance direction A2. The tip portion on the side (the end portion on the nip portion 13g side) may be used, and is not limited to the above-described embodiment.

  Further, in the above-described embodiment, a pair of spacer members 39 are provided between the lower movable guide plate 33 and the upper movable guide plate 34 and are fixed by the two screw members 41, whereby the lower movable guide plate 33. And the upper movable guide plate 34 are defined. However, as long as the distance between the lower movable guide plate 33 and the upper movable guide plate 34 can be defined from the above viewpoint, the mounting method may be other configurations. It is not limited.

  In the above-described embodiments, the recording medium on which the print image is formed is shown as the paper P. However, this paper P includes, in addition to general paper, special paper such as coated paper, OHP sheet, and the like. It is a waste. For this reason, the paper conveyance direction can be paraphrased as a sheet conveyance direction, the paper as a sheet, and the above terms as high-level terms.

  The stencil printing apparatus of the present invention has been described based on the embodiments. However, the specific configuration is not limited to the embodiments, and design changes and additions are permitted without departing from the gist of the present invention. Is done.

10 Stencil printing device 13a (as an example of a stencil printing device) 13a Printing drum (as an example of a plate cylinder) 13f Press roller 13g Nip portion 14 Paper feeding portion 14e Upper resist roller 14f (as an example of a pair of registration rollers) Lower registration roller 18 (as an example of a pair of registration rollers) 18 (as an example of stencil paper) Master 19 (as an example of a blower mechanism) Air knife 31 Lower fixed guide plate 31c (As an example, an uneven portion is formed. ) Projection side 31d (forms an uneven portion as an example) Recess 32 Upper fixed guide plate 32c (forms an uneven portion as an example) Projection side 32d (forms an uneven portion as an example) Recess 33 Lower side Movable guide plate 33b (forms an uneven portion as an example) Projection side portion 33c (forms an uneven portion as an example) Concave portion 3 Upper movable guide plate 34b (forms an uneven portion as an example) Projection side portion 34c (forms an uneven portion as an example) Recess 35 Support arm portion 36 Support shaft 37 Pushing displacement mechanism 39 Spacer member A2 Paper transport direction P Paper

JP 2011-110910 A

Claims (8)

A stencil sheet mounted on the outer periphery and driven to rotate;
A press roller that is displaceable between a pressing position that is pressed against the plate cylinder to form a nip portion, and a retreat position that is separated from the plate cylinder;
A feeding mechanism for feeding paper toward the nip portion in accordance with the rotation of the plate cylinder;
A blower mechanism for blowing air to the nip portion from the downstream side in the rotation direction of the plate cylinder;
A lower movable guide plate and an upper movable guide plate that are arranged close to each other in order to guide the sheet fed by the feeding mechanism to the nip portion,
The stencil printing apparatus, wherein the lower movable guide plate and the upper movable guide plate are displaced with displacement of the press roller. The stencil printing apparatus according to claim 1,
The stencil printing apparatus further comprises a pressing displacement mechanism for displacing the press roller between the pressing position and the retracted position. The feeding mechanism includes a pair of registration rollers that are rotationally driven to send out the paper, and a lower fixed guide plate and an upper fixed guide plate that are juxtaposed in parallel to guide the paper between the registration rollers. Have
The lower movable guide plate and the upper movable guide plate are displaced at the end on the nip portion side with the displacement of the press roller,
The lower movable guide plate is arranged side by side with the lower fixed guide plate in the paper transport direction in which the paper is sent out by the registration rollers regardless of the displacement of the end portion on the nip side.
The upper movable guide plate is arranged side by side with the upper fixed guide plate in the paper transport direction by the registration rollers regardless of the displacement of the end portion on the nip portion side. 2. The stencil printing apparatus according to 2. The lower movable guide plate and the lower fixed guide plate are arranged side by side in the paper transport direction by fitting the concave portion and the convex portion of each other, and are related to the displacement of the end portion on the nip portion side. Without maintaining a state in which at least a part of the concave and convex portions of each other overlap in the paper transport direction,
The upper movable guide plate and the upper fixed guide plate are arranged side by side in the paper transport direction by fitting the concave portion and the convex portion of each other, and each other regardless of the displacement of the end portion on the nip portion side. The stencil printing apparatus according to claim 3, wherein a state in which at least a part of the concave portion and the convex portion is overlapped in the paper transport direction is maintained.   5. The gap between the lower movable guide plate and the upper movable guide plate is an interval between the end portions on the nip portion side of 2 mm or less. 6. Stencil printing machine.   The space between the lower movable guide plate and the upper movable guide plate is defined by interposing a spacer member, according to any one of claims 1 to 5. Stencil printing machine. The press roller is displaceable between the pressing position and the retracted position by being supported by a support arm that is rotatable about a fulcrum shaft.
The stencil printing apparatus according to any one of claims 1 to 6, wherein the lower movable guide plate and the upper movable guide plate are attached to the support arm. 8. The feed mechanism according to claim 1, wherein the feeding mechanism is provided in a paper feed unit that sequentially feeds the paper one by one from among the stacked ones. 9. Stencil printing machine.