JP2003039804A - Printing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing unit which enables easy attainment of a double- side printing image by connecting it with stencil printing equipment for single- side printing, while suppressing an increase of the cost, and also can be removed simply when the single-side printing is conducted. SOLUTION: The printing unit 1 is connected with the stencil printing equipment so as to conduct double-side printing, and it is equipped with a plate cylinder 3 whereon a master 16 is wound, a plate making part 2 which makes the master 16, a paper carrying means 5 which receives and carries paper already subjected to single-side printing and delivered from the stencil printing equipment 50, a pressing means 4 which brings the other side of this paper into pressure contact with the plate cylinder 3, a paper delivering part 6 which delivers outside the unit the paper subjected to the double-side printing and having images transferred onto both sides, and a plate discharging part 7 which strips the master already used off the plate cylinder 3 to be disposed of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing unit used by connecting to a stencil printing machine, and more specifically, printing on the unprinted side of a single-sided printed sheet sent from the stencil printing machine to obtain a double-sided printed matter. For a printing unit for.

[0002]

2. Description of the Related Art A rotatable plate cylinder formed by winding a plurality of layers of mesh screens of resin or metal mesh on a peripheral surface of a porous support plate which is a porous support cylinder, and a thermoplastic resin film (thickness). A thermoplastic resin film of a master using a master having a laminated structure in which Washi fibers or synthetic fibers or a mixture of Washi fibers and synthetic fibers are pasted together. The surface is heated and perforated by a thermal head and then wound around the plate cylinder, and while the ink is supplied from the ink supply means provided inside the plate cylinder, the printing paper is printed on the outer peripheral surface of the plate cylinder by a printing means such as a press roller. Thermally sensitive digital holes that perform printing by continuously pressing the finished master to exude ink from the plate cylinder opening and master perforation and transfer it to the printing paper. Printing apparatus is generally known.

In this stencil printer, image reading, plate making,
A fully automatic type that automatically and continuously performs each process such as printing and plate discharge is mainly used.In this fully automatic type stencil printing machine, the image of the original to be printed is read by the reading device. , The master is heated and melt perforated by a plate making device having a thermal head, a platen roller, etc., and is automatically wound around the plate cylinder, and the printing paper fed from the paper feeding unit is printed on the outer surface of the plate cylinder by the printing means. Printing is performed by being continuously pressed.

In stencil printing, in recent years, double-sided printing, in which printing is performed on both sides of the printing paper, has tended to increase due to reasons such as saving the printing paper and preventing the increase of files.
When this double-sided printing is performed using a normal stencil printing machine, the printing paper stacked in the paper feed section is fed to the printing section, after printing on one side, the printing paper is turned over and fed again to the printing section. Double-sided printed matter can be obtained by sending and printing on the other side, but work to set print paper that was once discharged to the paper feed section again, or work to align print paper after simplex printing There was a problem that was troublesome.

In addition, the ink on the printed matter after printing is not sufficiently dried, and when printing is attempted on the back side immediately, the conveying roller, the pressing member, etc. are pressed against the image portion, and the printed image becomes dirty or disturbed. Therefore, in most cases, printing on the back side is performed after several hours or more after printing, especially when there is a solid image part, it is necessary to dry for a long time, and after the next day Printing was on the back side. As described above, in double-sided printing, it is necessary to dry the printing paper for a long time before printing on the back surface, and moreover, the paper feeding process has to be performed twice, which is a problem that it takes too much time. ..

Therefore, a technique for printing on both sides of a printing paper in one step and obtaining a double-sided printed matter in a short time is disclosed in, for example, Japanese Patent Laid-Open Nos. 10-147052 and 20.
00-135851, JP-A-8-85661, JP-A-8-118774, and JP-A-8-908.
No. 93, JP-A-10-114136, and the like.

[0007]

However, in any of the above-mentioned techniques, if one kitchen already has a stencil printer for single-sided printing, it cannot be used as it is.
There is a problem that the cost increases. JP-A-1
In the technology disclosed in 0-147052, it is necessary to provide a switching unit for switching the paper feed section of the stencil printing apparatus to which of the two paper feed paths and the paper feed path the printing paper is passed.
In the technique disclosed in Japanese Patent Laid-Open No. 2000-135851, it is necessary to provide a paper reversing unit in addition to the two stencil printing apparatuses. Further, in the techniques disclosed in JP-A-8-85661, JP-A-8-118774, JP-A-8-90893, and JP-A-10-114136, the entire stencil printing apparatus is reconfigured for double-sided printing. The need arises, not only the cost is increased, but also the stencil printing apparatus for single-sided printing is wasted.

According to the present invention, by solving the above-mentioned problems and connecting to a stencil printing apparatus for single-sided printing, it is possible to easily obtain a double-sided printed image while suppressing the cost increase, and to easily remove it at the time of single-sided printing. It is intended to provide a printing unit capable of

[0009]

The invention according to claim 1 is
A printing unit which is connected to a stencil printing device to perform double-sided printing, wherein a plate cylinder around which a master is wound, a plate making portion for making the master, and a single side printed on one side discharged from the stencil printing device. Paper transport means for receiving and transporting printed paper, pressing means for pressing the other surface of the one-side printed paper transported by the paper transport means to the outer peripheral surface of the plate cylinder, and the plate cylinder by the pressing means. A discharge unit for discharging the double-sided printed sheet, on which images have been transferred on both sides by being pressed to the outside of the machine, and a discharge unit for separating the used master from the plate cylinder and discarding it. And

According to a second aspect of the present invention, there is provided a printing unit which is connected to a stencil printing device to perform double-sided printing, and which is detachable from the stencil printing device and the unit main body and has a master wound around it. And a transfer cylinder that has substantially the same diameter as the plate cylinder and is driven to rotate in synchronism with the plate cylinder, and contacts the plate cylinder to transfer an image onto the outer peripheral surface thereof, and discharges from the stencil printing machine. Sheet conveying means for receiving and conveying the one-side printed sheet printed on one side, and pressing means for pressing the other side of the one-side printed sheet conveyed by the sheet conveying means to the outer peripheral surface of the transfer cylinder. And a sheet discharging unit configured to discharge the double-sided printed sheet having the images transferred on both sides thereof by the pressing unit to the transfer cylinder, to the outside of the machine.

According to a third aspect of the present invention, in the printing unit according to the second aspect, there is further provided displacement means for displacing a relative position between the plate cylinder and the transfer cylinder, and the displacement means is arranged with respect to the unit main body. It is characterized in that it operates when the plate cylinder is attached and detached.

According to a fourth aspect of the present invention, in the printing unit according to any one of the first to third aspects, a cleaning unit for cleaning the surface of the printing unit is further provided in the vicinity of the pressing unit. Characterize.

According to a fifth aspect of the present invention, in the printing unit according to the fourth aspect, the pressing means is further arranged above the plate cylinder.

According to a sixth aspect of the present invention, in the printing unit according to any one of the first to fifth aspects, the rotational peripheral speed of the plate cylinder and the sheet conveying speed of the sheet conveying means are further set. The moving speed is the same as the moving speed of the one-side printed sheet discharged from the stencil printing machine.

According to a seventh aspect of the present invention, in the printing unit according to any one of the first to sixth aspects, the stencil printing apparatus further has a discharge tray on which the single-side printed sheets can be stacked. Is detachably attached, and the paper discharge unit is configured to be removable from the paper discharge tray.

According to an eighth aspect of the present invention, in the printing unit according to any one of the first to seventh aspects, the one-side printed sheet conveyed by the sheet conveying means is temporarily stopped. And a resist cleaning means for cleaning the surface of the resist roller pair, which is provided near the resist roller pair.

[0017]

1 is a schematic front view of a printing unit used in a first embodiment of the present invention. In the drawing, the printing unit 1 includes a plate making unit 2, a plate cylinder 3, a press roller 4 as a pressing unit, a sheet conveying unit 5, a sheet discharging unit 6, a plate discharging unit 7,
It has an image reading unit 8.

The plate making section 2 arranged at the lower left of the unit main body 9 includes a master storing means 10, a platen roller 11,
It has a thermal head 12, a cutting means 13, a pair of master conveyance rollers 14 and 15, and the like.

The master storage means 10 has a core portion 16b of a master roll 16a formed by winding a master 16 constituted by laminating a thermoplastic resin film and a porous support in a roll shape, and is rotatable and removable. To support. The platen roller 11 is rotatably supported by a side plate (not shown) of the unit main body 9, and is rotationally driven by a stepping motor (not shown) to convey the master 16. The thermal head 12, which has a large number of heating elements and which heat-perforates the thermoplastic resin film surface of the master 16, is attached to a side plate (not shown) of the unit main body 9 and is urged by a biasing means (not shown). The heating element surface is pressed against the platen roller 11 with a predetermined pressing force.

A cutting means 13 having a fixed blade 13a and a movable blade 13b is arranged downstream of the platen roller 11 and the thermal head 12 in the master conveying direction. In the cutting means 13, the movable blade 13b is rotationally moved with respect to the fixed blade 13a fixed to the unit main body 9, and the master 1
This is a well-known configuration for cutting 6. On the downstream side of the cutting means 13 in the master conveyance direction, a master conveyance roller pair 14, 1 including a driving roller and a driven roller pressed against the driving roller.
5 are provided.

A plate cylinder 3 is arranged on the upper right side of the plate making section 2. The plate cylinder 3 has a pair of flanges (not shown), a porous support plate (not shown) provided on the peripheral surface, and a mesh screen (not shown) provided on the surface of the porous support plate (not shown), The flange, the porous support plate, and the mesh screen are rotatably supported by a support shaft 17 which also serves as an ink supply pipe, and are rotationally driven by a plate cylinder driving means (not shown). A porous support plate made of a metal plate such as stainless steel has an opening formed of a plurality of through holes formed by electroforming, and a mesh screen made of resin or a metal mesh body has a porous support. A plurality of layers are wound around a portion corresponding to the opening of the plate. Further, a non-opening portion forming a plane portion is provided on the porous support plate, and the openable / closable clamper 18 for holding the master 16 on the plate cylinder 3 is provided in the non-opening portion.
Is provided. The clamper 18 is opened and closed by an opening / closing means (not shown) when the plate cylinder 3 occupies a predetermined position.

Ink supply means 19 is arranged inside the plate cylinder 3. The ink supply means 19 is a support shaft 17 for introducing ink sucked by an unillustrated pump from an ink pack (not shown) provided outside the plate cylinder 3 into the plate cylinder 3, and an ink supply connected to the support shaft 17. Mainly from the pipe 20, the ink roller 21 that supplies the ink supplied from the ink supply pipe 20 to the inner peripheral surface of the porous support plate, the doctor roller 22 that is arranged with a slight gap between the ink roller 21 and the like. It is configured.

A plurality of supply holes for supplying ink to the inside of the plate cylinder 3 are formed in the support shaft 17, and the ink dropped from the ink supply pipe 20 connected to the supply holes and the ink roller 21. An ink pool 23 is formed by pooling in a wedge-shaped space formed in the vicinity of the doctor roller 22. The ink in the ink reservoir 23 is the ink roller 2
Kneaded by the rotation of 1 and the doctor roller 22,
It is supplied to the surface of the ink roller 21 while its layer thickness is regulated by the doctor roller 22. The ink held by the ink roller 21 is supplied to the inner peripheral surface of the porous support plate.

A press roller 4 is arranged above the plate cylinder 3. The press rollers 4 are rotatably supported at both ends on the first tops of a pair of press roller arms 24 each having a substantially triangular shape, and the second tops of each press roller arm 24 are respectively connected to the unit main body 9. It is swingably supported by. Each press roller arm 24 is swung by a swinging means (not shown), and the press roller 4 has its peripheral surface in pressure contact with the outer peripheral surface of the plate cylinder 3 as shown in FIG. It is selectively displaced to a separated position separated from the surface. A press roller holding means (not shown) that holds the press roller 4 at the separated position is disposed near the swinging means (not shown).

Both ends of a cleaning roller 25 as a cleaning means are rotatably supported on the third top of each press roller arm 24. The cleaning roller 25 is pressed against the press roller 4 with a predetermined pressure contact force, and is rotationally driven in the same direction as the press roller 4 at the time of press contact of the plate cylinder by a driving unit (not shown). The pressing force of the cleaning roller 25 to the press roller 4 is set to be smaller than the pressing force of the press roller 4 to the plate cylinder 3,
During press contact of the plate cylinder, the press roller 4 rotates following the plate cylinder 3.

A sheet conveying means 5 is arranged on the right side of the plate cylinder 3. The sheet conveying means 5 is constituted by a conveyor having a driving roller 26, a driven roller 27, an endless belt 28, a suction fan 29, etc., and a printing sheet P taken in from a sheet inlet (not shown) provided in the unit main body 9. To transport. The drive roller 26 and the driven roller 27 are rotatably supported by a carrier frame (not shown), and the drive roller 26 is rotationally driven in the counterclockwise direction in the figure by a drive unit (not shown). The endless belt 28 includes a driving roller 26 and a driven roller 27.
A plurality of endless belts 28 are spanned between the endless belts 28 and each of the endless belts 28 has a plurality of openings. The suction fan 29 is attached to the lower side of a conveying unit frame (not shown), and sucks the printing paper P conveyed on the endless belt 28 from the lower side and holds it on the endless belt 28.

Guide plates 30, 31 for guiding the conveyance of the printing paper P are provided on the downstream side of the paper conveyance means 5 in the paper conveyance direction.
And a registration roller pair 32 are provided. Each of the guide plates 30 and 31 is fixed to a side plate (not shown) of the unit main body 9, and guides the printing paper conveyed by the paper conveying means 5 to the registration roller pair 32. The registration roller pair 32 has a driving roller 32a that is rotationally driven by a driving unit and a driven roller 32b that is arranged in pressure contact with the driving roller 32a.
Each of 2a and 32b is rotatably supported by a side plate (not shown) of the unit body 9.

The driven roller 32 of the drive roller 32a
A cleaning roller 33 as a resist cleaning means is arranged at a position facing the contact position with b. The cleaning roller 33 is a drive roller 32a.
Are pressed against each other with a predetermined pressure contact force, and are rotationally driven in the same direction as the driving roller 32a when the driving roller 32a is rotationally driven by a driving unit (not shown).

A paper detection sensor 117 is arranged at a position upstream of the registration roller pair 32 in the paper conveyance direction. Paper detection sensor 117 consisting of a reflective sensor
Is arranged below the guide plate 31, and detects when the leading edge of the printing paper P conveyed by the paper conveying means 5 is nipped by the registration roller pair 32. The paper detection signal output from the paper detection sensor 117 is
The signal is output to control means (not shown) that controls the printing unit 1, and the control means (not shown) receives this signal and controls the operation of the printing unit 1.

A paper discharge section 6 is disposed downstream of the plate cylinder 3 and the press roller 4 in the paper conveyance direction. The paper discharge section 6 is
It has a peeling claw 34 and a paper discharge conveyance member 35. A support shaft 34a of the peeling claw 34 is rotatably supported by the unit main body 9, and a position at which the tip of the peeling claw 34 is close to the outer peripheral surface of the plate cylinder 3 and a peripheral surface of the plate cylinder 3 are provided by a claw swinging device (not shown). It is selectively swung to a position further away.

Similar to the paper transport means 5, the paper discharge transport member 35 is composed of a conveyor having a drive roller 36, a driven roller 37, an endless belt 38, a suction fan 39 and the like. The drive roller 36 and the driven roller 37 are rotatably supported by a transport member frame (not shown), and the drive roller 36 is rotationally driven in the clockwise direction in the figure by drive means (not shown). Endless belt 3
A plurality of rollers 8 are provided between the driving roller 36 and the driven roller 37, and each endless belt 38 has a plurality of openings. The suction fan 39 is attached to the upper side of a transport member frame (not shown), and the endless belt 38
The endless belt 3 by sucking the printing paper P conveyed below
Hold at 8.

A plate discharge section 7 is arranged on the lower right side of the plate cylinder 3. The plate discharge unit 7 includes a first plate discharge member 40 and a second plate discharge member 4
1, a plate discharge box 42, a compression plate 43, and the like. The first plate discharging member 40 includes a driving roller 44 and a driven roller 4.
5, the endless belt 46, the second plate discharge member 41 has a drive roller 47, a driven roller 48, an endless belt 49, respectively, the drive roller 44 and the driven roller 45 is rotatably supported by a bracket (not shown),
The drive roller 47 and the driven roller 48 are rotatably supported by a plate discharge frame (not shown). The drive rollers 44 and 47 are rotationally driven by a plate discharge drive means (not shown), respectively.
Endless belt 4 that is stretched between the driven roller 45 and the driven roller 45.
6 and the endless belt 49 stretched between the driving roller 47 and the driven roller 48 is moved in the direction of the arrow in the figure. A bracket (not shown) that supports the first plate discharging member 40 is movably supported by a plate discharging frame (not shown), and the bracket (not shown) is moved by a moving unit (not shown) so that the first plate discharging member 40 is at the position shown in the figure. And the endless belt 46 located on the outer peripheral surface of the drive roller 44 is selectively moved to a position where it contacts the outer peripheral surface of the plate cylinder 3. Plate ejection box 42 for storing used masters inside
Is detachably attached to the unit body 9. A compression plate 43 for compressing the used master stored in the plate discharge box 42 is supported by the unit body 9 so as to be vertically movable.

An image reading section 8 is arranged above the unit main body 9. The image reading unit 8 has a well-known configuration including a contact glass, a reflection mirror, a fluorescent lamp, a lens, an image sensor, etc., which are not shown. In this embodiment, the image reading unit 8 is configured to be openable and closable with respect to the unit main body 9 as shown in FIG. 2, and the cleaning rollers 25 and 33 can be cleaned when the image reading unit 8 is opened. Has been done. The image reading unit 8 may be slidable with respect to the unit body 9 as shown in FIG.

A tray mounting portion (not shown) for mounting a discharge tray of a stencil printing machine, which will be described later, is provided at a portion located on the left side of the unit main body 9 and below the discharge portion 6. On the right side of the unit main body 9, there is provided a connecting portion (not shown) for connecting the printing unit 1 to the stencil printing apparatus. The connecting portion (not shown) includes a positioning portion (not shown) for positioning the printing unit 1 with respect to the stencil printing apparatus with the discharge tray removed, and an illustration for fixing the printing unit 1 with respect to the stencil printing apparatus. It does not have a fixed part.

FIG. 4 shows a stencil printing machine used in the first embodiment of the present invention. This stencil printer 50
Is a printing unit 51, a plate making unit 52, a paper feeding unit 53, a plate discharging unit 5
4, a paper discharge unit 55, and an image reading unit 56, and is placed on a dedicated table 57.

The printing section 51, which is arranged substantially in the center of the printing apparatus main body 58, has a plate cylinder 59 and a press roller 60. The plate cylinder 59 is a support shaft 6 that also functions as an ink supply pipe.
It is mainly composed of a pair of flanges (not shown) rotatably supported by 1 and a porous support plate wound around the outer peripheral surface of each flange, and is rotationally driven by a plate cylinder driving means (not shown). A porous support plate (not shown) formed of a stainless steel thin plate or the like has an opening portion having a large number of openings and a non-opening portion, and the tip of the master 73 is placed in the non-opening portion. An openable / closable clamper 62 for locking is provided. On the outside of the opening, about 1 to 3 layers of mesh screen (not shown) made of polyester or stainless steel fine wire is wound.

An ink supply means 65 having an ink roller 63, a doctor roller 64 and the like is arranged at a position inside the plate cylinder 59 and below the support shaft 61. The ink roller 63 and the doctor roller 64 are rotatably supported between the side plates (not shown) fixed to the support shaft 61, and the rotational force from the plate cylinder drive means (not shown) is transmitted by the drive force transmission means (not shown).
The ink roller 63 is rotated in the same direction as the plate cylinder 59, and the doctor roller 64 is rotated in the opposite direction to the plate cylinder 59. The ink roller 63 and the doctor roller 64 are arranged such that part of their peripheral surfaces are close to each other, and a wedge-shaped ink reservoir 66 is formed by the ink supplied from the support shaft 61 at this close portion.

A press roller 60 is arranged below the plate cylinder 59. Both ends of the press roller 60 are rotatably supported between a pair of arm members (not shown) that are swung by a swinging device (not shown). The press roller 60 is configured so that each arm member is swung,
A separation position (solid line position in the figure) separated from the outer peripheral surface of the plate cylinder 59 and a pressure contact position (two-dot chain line position in the drawing) pressed against the outer peripheral surface of the plate cylinder 59 are selectively occupied. Press roller 60
The pressure contact force when the plate is pressed against the plate cylinder 59 is set to be adjustable by a biasing means such as a tension spring (not shown).
In addition, a press roller holding means (not shown) that holds the press roller 60 at the separated position is disposed near the swinging means (not shown).

A plate making section 52 is disposed on the upper right side of the printing section 51. The plate making unit 52 includes a master storage means 67, a platen roller 68, a thermal head 69, and a cutting means 7.
0, master transport roller pairs 71, 72, etc.
The master storage means 67 rotatably and detachably supports a core portion 73b of a master roll 73a formed by winding a master 73 in which a thermoplastic resin film and a porous support are bonded together in a roll shape.

A platen roller 68 and a thermal head 69 are arranged downstream of the master storage means 67 in the master conveying direction. The platen roller 68 is rotatably supported by a side plate (not shown) of the printer body 58, and is rotatably driven by a stepping motor (not shown). The thermal head 69 having a large number of heating elements is attached to a side plate (not shown) of the printing apparatus main body 58, and is pressed against the platen roller 68 by the urging force of urging means (not shown). The thermal head 69 selectively heats the heating elements while contacting the surface of the thermoplastic resin film of the master 73, and performs hot melt perforation plate making on the master 73.

A cutting means 70 is arranged downstream of the platen roller 68 and the thermal head 69 in the master conveying direction. The cutting means 70 including the fixed blade 70a and the movable blade 70b has a well-known configuration in which the movable blade 70b is rotationally moved with respect to the fixed blade 70a fixed to the side plate of the printing apparatus main body 58. A pair of master transport rollers 71 and 72 is disposed downstream of the cutting means 70 in the master transport direction.
Each of the master transport roller pairs 71 and 72 includes a drive roller that is rotationally driven in synchronization by drive means (not shown),
The driven roller is in pressure contact with each drive roller by a biasing means (not shown).

A sheet feeding section 53 is arranged below the plate making section 52. The paper feed unit 53 includes a paper feed tray 74, a paper feed roller 75, a separation roller pair 76, and a registration roller pair 7.
7 and guide plates 78, 79, 80, 81 and the like.
The paper feed tray 74, on which a large number of printing papers P are stacked, is supported by the printing apparatus main body 58 so as to be vertically movable, and is vertically moved by an elevating means (not shown).

Above the paper feed tray 74, a paper feed roller 75 having a high friction resistance member on its surface is arranged.
The paper feed roller 75 is rotatably supported by a bracket (not shown) that is swingably supported by the printing apparatus main body 58. When the paper feed tray 74 is lifted by the elevating means, the paper feed tray 75 has a predetermined pressure contact force. The uppermost printing sheet on 74 is pressed. The paper feed roller 75 is rotationally driven by a paper feed drive means (not shown).

To the left of the paper feed roller 75, there is disposed a separation roller pair 76 consisting of an upper roller 76a and a lower roller 76b each having a high friction resistance member on its surface. The upper roller 76a is drivingly connected to the sheet feeding roller 75 via a driving force transmitting unit such as a gear or a belt, and is rotationally driven in the same direction in synchronization with the rotational driving of the sheet feeding roller 75. The lower roller 76b is pressed against the upper roller 76a by the urging force of an urging unit (not shown), and is configured to be rotatable only in the same direction as the upper roller 76a.

A resist roller pair 77 is disposed to the left of the separation roller pair 76. Registration roller pair 77 including drive roller 77a and driven roller 77b
The driving roller 77a is rotated at a predetermined timing synchronized with the plate cylinder 59 by transmitting the rotational driving force from the plate cylinder driving unit (not shown) to the driving force transmission unit such as a gear or a cam, and the driving roller 77a is rotated. The printing paper P is fed toward the printing unit 51 by the driven roller 77b pressed against the printing paper.

Guide plates 78 and 79 are arranged between the separation roller pair 76 and the registration roller pair 77.
The guide plates 78 and 79 are fixed to side plates (not shown) of the printing apparatus main body 58, and the guide plates 78 and 79 are provided.
The first half of the paper feed path for the printing paper P is constituted by. Guide plates 80 and 81 are arranged between the registration roller pair 77 and the printing unit 51. Each guide plate 80,
Reference numerals 81 are respectively fixed to side plates (not shown) of the printer main body 58, and the guide plates 80 and 81 form the latter half of the paper feed path for the print paper P.

A plate discharge section 54 is disposed on the upper left side of the printing section 51. The plate discharge unit 54 includes an upper plate discharge member 82, a lower plate discharge member 83, a plate discharge box 84, a compression plate 85, and the like. The upper plate discharging member 82 has a driving roller 86, a driven roller 87, an endless belt 88, and the like. The plate discharging driving unit (not shown) rotationally drives the driving roller 86 in the clockwise direction of the drawing to form the endless belt 88 of the drawing. Move in the direction of the arrow. The lower plate discharging member 83 has a driving roller 89, a driven roller 90, an endless belt 91, and the like, and the driving force of a plate discharging driving unit (not shown) that rotationally drives the driving roller 86 is transmitted by a driving force transmitting unit such as a gear or a belt. As a result, the drive roller 89 is rotationally driven in the counterclockwise direction in the figure, so that the endless belt 91 moves in the arrow direction in the figure. Further, the lower plate discharging member 83 is movably provided by a moving means (not shown), and a position shown in the drawing and a position where the endless belt 91 located on the outer peripheral surface of the driven roller 90 abuts on the outer peripheral surface of the plate cylinder 59. Are selectively positioned.

The plate discharge box 84 for storing the used master inside is detachably attached to the printer main body 58. A compression plate 85 for pushing the used master carried by the upper plate discharging member 82 and the lower plate discharging member 83 into the plate discharging box 84 is supported by the printing apparatus main body 58 so as to be movable up and down, and by a lifting means (not shown). Move up and down between the solid line position and the alternate long and two short dashes position.

Below the plate discharge section 54, a sheet discharge section 55 is arranged. The paper discharge section 55 includes the peeling claw 92 and the paper discharge guide plate 9.
3, a paper discharge conveying member 94, a paper discharge tray 95, and the like. A peeling claw 92 for peeling the printing paper P from the outer peripheral surface of the plate cylinder 59 is swingably supported by a side plate of the printing apparatus main body 58 by a support shaft 92a, and its tip end is rotated by a swinging means (not shown). It is selectively swung between a position close to the outer peripheral surface of 59 and a position where its tip is separated from the outer peripheral surface of the plate cylinder 59. Below the peeling claw 92, the printer main body 5 is provided.
A paper discharge guide plate 93 fixed to the side plate 8 is provided. The discharge guide plate 93 is pressed against the outer peripheral surface of the plate cylinder 59 by the press roller 60 to transfer the ink,
The printing paper P peeled from the outer peripheral surface of the plate cylinder 59 is received by the peeling claw 92, and is guided toward the paper discharge conveyance member 94.

The paper discharge transport member 94 includes a drive roller 96,
It has a driven roller 97, an endless belt 98, a suction fan 99, and the like. The drive roller 96 is rotatably supported by a unit side plate (not shown), and is rotationally driven by a paper discharge drive means (not shown). The driven roller 97 is also rotatably supported on the same side plate, and the drive roller 96 and the driven roller 97 have a plurality of endless belts 9 having a plurality of holes.
8 has been passed over. A suction fan 99 is provided below the drive roller 96, the driven roller 97, and the endless belt 98.
Is provided. The discharge conveyance member 94 is the suction fan 9
The printing paper P is sucked onto the endless belt 98 by the suction force of 9, and the printing paper P is conveyed in the direction of the arrow in the figure by the rotation of the drive roller 96.

A paper ejection tray 95, on which the printing paper P conveyed by the paper ejection conveying member 94 and ejected from a paper ejection port (not shown) of the printing apparatus main body 58 is stacked, is movable in the paper conveying direction. End fence 100,
It has a pair of side fences 101 movable in the paper width direction. The paper discharge tray 95 is configured to be removable from the printing apparatus main body 58 and also removable from the unit main body 9.

The image reading section 5 is provided on the upper portion of the printing apparatus main body 58.
6 are provided. The image reading unit 56 includes a document receiving tray 102 on which a document is placed, a contact glass 103 on which the document is placed, a document transport roller pair 104 and a document transport roller 105 that transport the document, and a guide plate 106 that guides the document to be transported. , 107, contact glass 10
3, a plurality of document transport belts 108 for transporting the document, a switching plate 109 for switching the discharge direction of the read document, the above-mentioned members other than the contact glass 103 are supported, and are provided so as to be capable of contacting and separating from the contact glass 103. Pressure plate 1
10, a reflection mirror 111 for scanning and reading an original image,
112 and a fluorescent lamp 113, a lens 114 that focuses the scanned image, an image sensor 115 such as a CCD that processes the focused image, and the like.

Based on the above configuration, first, the stencil printing machine 5
A single-sided printing operation when 0 is used alone will be described. The operator opens the pressure plate 110 and opens the contact glass 10
After placing the original to be printed on the sheet 3, the pressure plate 110 is closed again. Then, after setting the plate making conditions with various keys on the operation panel (not shown), a plate making start key (not shown) is pressed.

When the plate-making start key is pressed, the image reading section 56 reads the original image. The reading of the original image is performed by reflecting the reflected light exposed by the fluorescent lamp 113 by the reflection mirrors 111 and 112, and the read original image is condensed by the lens 114 and then incident on the image sensor 115. The photoelectrically converted electrical signal is input to an A / D converter (not shown) in the printer body 58.

When the original is automatically conveyed without opening the pressure plate 110, the plate-making start key is depressed with the original placed on the original tray 102. Then, the document transport roller pair 104 starts to rotate, and the topmost one sheet of the document (not shown) is transported onto the contact glass 103, and the image is read in the same manner as described above. The document whose image has been read is discharged by a document transport belt 108 and a document transport roller 105 to a document tray (not shown) arranged above the document transport belt 108.

In parallel with the image reading operation in the image reading section 56, the plate discharging section 54 performs a plate discharging operation for peeling the used master from the outer peripheral surface of the plate cylinder 59. When the plate making start key is pressed, the plate cylinder 59 starts to rotate, and when the tip of the used master on the outer peripheral surface reaches a predetermined plate ejection position corresponding to the endless belt 91 on the outer peripheral surface of the driven roller 90, The rotation of the plate cylinder 59 is stopped. After that, the plate discharge driving means and the moving means are actuated, the respective drive rollers 86, 89 rotate, and the lower plate discharge member 83 moves to the plate cylinder 59 side. When the endless belt 91 located on the outer peripheral surface of the driven roller 90 comes into contact with the used master, the plate cylinder 59 rotates again, and the used master picked up in contact with the endless belt 91 has the lower plate discharging member 83 and the upper plate discharged. It is sandwiched by the member 82 and separated from the outer peripheral surface of the plate cylinder 59. The used master that has been peeled off is conveyed by the lower plate discharge member 83 and the upper plate discharge member 82 and discarded in the plate discharge box 84, and then the compression plate 85.
Compressed by.

The plate cylinder 59 continues to rotate even after all the used masters have been peeled off from the outer peripheral surface, and the clamper 62 rotates to a predetermined plate feed standby position located almost right beside and stops. When the plate cylinder 59 is stopped at the plate supply standby position, the opening / closing means (not shown) is activated to open the clamper 62, and the stencil printing apparatus 50 enters the plate supply standby state.

When the stencil printing apparatus 50 is in the plate supply standby state after the plate discharging operation is completed, the platen roller 68 and the respective master transport roller pairs 71, 72 are rotationally driven to pull out the master 73 from the master roll 73a. When the image forming area of the master 73 reaches the position corresponding to the heating element of the thermal head 69, the heating element of the thermal head 69 selectively generates heat based on the image data signal sent from the image reading unit 56, A plate-making image is formed on the thermoplastic resin film surface of the master 73. The master 73 is sent to the clamper 62 while forming a plate-making image, and when its tip reaches a predetermined position where it can be clamped by the clamper 62, an opening / closing means (not shown) is actuated to operate the clamper 62.
Is closed, and the leading end of the master 73 is held by the plate cylinder 59.

Thereafter, the plate cylinder 59 is rotationally driven in the clockwise direction in FIG. 4 at the same peripheral speed as the transport speed of the master 73, and the winding operation of the master 73 around the plate cylinder 59 is performed. Then, when the image data signal from the image reading unit 56 is cut off, the operation of the thermal head 69 is stopped, and when the master 73 for one plate is conveyed by plate making, the platen roller 68 and the master conveying roller pairs 71, 72 are rotated. When stopped, the movable blade 70b rotationally moves and the master 73 is cut. The cut master 73 is pulled out from the plate making section 52 by the rotation of the plate cylinder 59, and the plate cylinder 59 rotates to the home position and stops, whereby the plate making operation and the plate feeding operation are completed.

After the plate feeding operation, the printing operation is performed. When the plate cylinder 59 is stopped at the home position, the paper feed roller 75, the upper roller 76a, the drive roller 96, and the suction fan 99 are driven, and the plate cylinder 59 is rotationally driven at a low speed in the clockwise direction of FIG. Paper tray 7
The uppermost one of the printing sheets P stacked on the sheet 4 is pulled out, and the leading end thereof is nipped by the registration roller pair 77. Then, the drive roller 77a is driven at a predetermined timing when the leading edge of the image area of the master 73 wound around the plate cylinder 59 in the rotation direction of the plate cylinder reaches a position corresponding to the press roller 60, and the drawn printing paper P is drawn. Is plate cylinder 5
9 and the press roller 60. Almost at the same time as the rotation of the drive roller 77a, the holding of the press roller 60 by the press roller holding means (not shown) is released, and the press roller 60 presses its outer peripheral surface against the outer peripheral surface of the plate cylinder 59 by a predetermined pressing force.

The printing paper P fed by the registration roller pair 77 is printed by the press roller 60 on the plate cylinder 59.
It is pressed by the master 73 wound around. By this pressing operation, the press roller 60, the printing paper P, the master 73, and the plate cylinder 59 are brought into pressure contact with each other, and the ink supplied from the ink roller 63 to the inner peripheral surface of the plate cylinder 59 oozes out from the openings of the plate cylinder 59. , The porous support plate (not shown) and mesh screen (not shown) of the plate cylinder 59, and the printing paper P through the perforated portion of the master 73 after being filled in the porous support of the master 73.
Is transferred to, and so-called printing is performed. When the transfer of the image to the printing paper P is completed, the press roller 60 moves the plate cylinder 5
9, the press roller 60 is again held at the separated position by the press roller holding means.

The printing paper P on which the image is transferred is separated by the peeling claw 9
The sheet is separated from the outer peripheral surface of the plate cylinder 59 at the front end of the sheet 2 and falls downward, and is guided by the sheet discharge guide plate 93 and discharged sheet conveying member 94.
Sent to. The printing paper P sent to the paper discharge conveying member 94 is attracted by the suction fan 99 to the endless belt 98.
While being attracted to the upper surface of the sheet, the sheet is conveyed to the left and discharged onto the sheet discharge tray 95. After that, the plate cylinder 59 is again rotated to the home position and stopped, and the stencil printing apparatus 50 is brought into a print standby state after the plate printing operation is completed.

After that, when a test printing key (not shown) is pressed after various printing conditions are input, one printing paper P is fed from the paper feeding portion 53 and the plate cylinder 59 is faster than when printing. Is rotatably driven for trial printing. After the trial printing, when the print start key (not shown) is pressed after the number of printed sheets is set, the printing paper P is continuously fed from the paper feeding portion 53 to perform printing. After the printing operation is completed,
The plate cylinder 59 returns to the home position again.

Next, the stencil printer 50 is connected to the printing unit 1
The operation in the case of performing the one-step double-sided printing by connecting the above will be described. Prior to printing, first, the paper discharge tray 95 is removed from the stencil printing apparatus 50, and this is attached to the printing unit 1.
Next, the sheet discharge port (not shown) of the printing apparatus main body 58 and the sheet intake port (not shown) of the unit main body 9 are aligned with each other.
By fixing the unit main body 9 and the printing apparatus main body 58 with the connecting member 116 as shown in FIG. 3, the printing unit 1 and the stencil printing apparatus 50 are connected. At the time of this connection,
The printing unit 1 and the stencil printing device 50 are also electrically connected by a connector (not shown), and the printing unit 1 is supplied with power from the stencil printing device 50 to operate.

After connecting the printing unit 1 to the stencil printing device 50, the operator puts the original of the image to be formed on the front side (back side) of the printing paper P in the image reading section 56 and the printing paper P in the image reading section 8. An original of an image to be formed on the back side (front side) is placed, and a plate-making start key (not shown) provided on each operation panel (not shown) of the stencil printing apparatus 50 and the printing unit 1 is pressed.

When the plate-making start key is pressed, the image reading section 56 performs the reading operation of the original image as in the case of single-sided printing. The read image is photoelectrically converted and then input to an A / D converter (not shown) in the printer body 58. On the other hand, the image reading unit 8 also performs the same reading operation as the image reading unit 56. The read image is photoelectrically converted and then input to an A / D converter (not shown) in the unit body 9.

In parallel with the image reading operation of the image reading section 56, the plate discharging section 54 performs the plate discharging operation as in the single-sided printing. Further, in parallel with the image reading operation of the image reading unit 8, the plate discharging unit 7 performs the plate discharging operation. The plate cylinder 3 stops by rotating the tip of the used master on the outer peripheral surface thereof to a predetermined plate ejection position corresponding to the endless belt 46 on the outer peripheral surface of the drive roller 44. After that, the plate discharge driving means and the moving means are actuated, the respective drive rollers 44, 47 rotate, and the first plate discharge member 40 moves to the plate cylinder 3 side. When the endless belt 46 located on the outer peripheral surface of the drive roller 44 comes into contact with the used master, the plate cylinder 3 rotates again, and the endless belt 4
The used master picked up by coming into contact with 6 is sandwiched between the first plate discharging member 40 and the second plate discharging member 41 and peeled off from the outer peripheral surface of the plate cylinder 3. The peeled used master is conveyed by the first plate discharging member 40 and the second plate discharging member 41 and discarded in the plate discharging box 42, and then compressed by the compression plate 43.

After the used master is peeled off from each outer peripheral surface, each plate cylinder 3, 59 rotates to the plate supply standby position and stops. After the plate cylinders 3, 59 are stopped, the opening / closing means (not shown) is activated to open the clampers 18, 62, respectively, and the stencil printing apparatus 50 and the printing unit 1 are in the plate supply standby state.

When the stencil printing apparatus 50 enters the plate supply standby state after the plate discharge operation is completed, the plate making operation and the plate supplying operation are performed as in the case of single-sided printing. The plate cylinder 59, around which the master 73 made by plate making is wound, rotates to the home position and stops.
Further, at the same time as the stencil printing apparatus 50, the plate making operation and the plate feeding operation are performed on the printing unit 1 side. Platen roller 1
1 and each master transport roller pair 14 and 15 are rotationally driven to pull out the master 16 from the master roll 16a,
The master 16 thus pulled out has its thermoplastic resin film surface heat-perforated by the thermal head 12. The master 16 has its front end clamped by a clamper 18, is pulled out from the plate making section 2 by the rotation of the plate cylinder 3, and is wound around the outer peripheral surface of the plate cylinder 3. When the master 16 for one plate is conveyed, the cutting means 13 operates to cut the master 16, the plate cylinder 3 rotates to the home position and stops, and the plate making operation and the plate feeding operation on the printing unit 1 side. Is completed.

After the plate feeding operation is completed in the stencil printing device 50 and the plate cylinder 59 is positioned at the home position, the stencil printing device 5 is controlled by the control means (not shown) of the printing unit 1.
When a signal indicating that the printing unit 1 has completed the plate feeding is sent to the control means 0 (not shown), the plate making operation is performed. The sheet feeding roller 75, the upper roller 76a, the driving roller 96, the suction fan 99, the driving roller 26, the suction fan 29, the driving roller 36, and the suction fan 39 are driven, respectively, and the plate cylinder 59 and the plate cylinder 3 are driven at a low speed. Is rotated in the direction of the arrow, and the uppermost one sheet of the print paper P stacked on the paper feed tray 74 is pulled out. The pulled-out printing paper P is sandwiched by the pair of registration rollers 77 at the leading edge thereof, and is fed between the plate cylinder 59 and the press roller 60 at the same timing as in single-sided printing.

Printing paper P by registration roller pair 77
The pressing roller 60 is released from the holding by the pressing roller holding means (not shown) almost at the same time as the feeding, and the pressing roller 60 is pressed against the plate cylinder 59 by a predetermined pressing force. By this pressure contact, the press roller 60, the printing paper P, the master 73, and the plate cylinder 59 are pressed into contact with each other, and the printing is performed in the same manner as in single-sided printing. After printing, the press roller 60 is again held at the separated position by the press roller holding means, and the printing paper P having the image transferred on its one surface is separated by the peeling claw 9.
After being peeled off from the outer peripheral surface of the plate cylinder 59 by 2, the sheet is conveyed onto the paper discharge conveying member 94.

The printing paper P sent to the paper delivery member 94
Is conveyed leftward while its non-image surface is attracted to the upper surface of the endless belt 98 by the suction force of the suction fan 99, and is discharged to the outside of the printing apparatus main body 58 from a sheet discharge port (not shown). The printing paper P ejected from the paper ejection opening (not shown) is taken into the inside of the unit main body 9 from the paper introduction opening (not shown) connected to the printing paper P, and is delivered to the paper conveyance means 5. The printing paper P sent to the paper transport means 5.
Is conveyed to the left while its non-image surface is attracted to the upper surface of the endless belt 28 by the suction force of the suction fan 29, and its tip is brought into contact with the nip portion of the registration roller pair 32. At this time, a detection signal is output from the paper detection sensor 117 that detects the leading edge of the printing paper P to the control unit (not shown) of the printing unit 1.

The control means (not shown) which receives the signal from the sheet detection sensor 117 is the master 1 wound around the plate cylinder 3.
The drive roller 32a is rotationally driven at a predetermined timing when the leading edge of the image area 6 in the direction of rotation of the plate cylinder reaches a position corresponding to the press roller 4. As a result, the printing paper P nipped by the pair of registration rollers 32 is fed between the plate cylinder 3 and the press roller 4, and the driving roller 32a.
The holding of the press roller 4 by the press roller holding means (not shown) is released almost simultaneously with the rotation of the printing paper P, and the printing paper P is pressed by the press roller 4 against the master 16 wound around the plate cylinder 3. Further, the cleaning roller 33 is rotationally driven simultaneously with the rotation of the drive roller 32a, and the cleaning roller 25 is rotationally driven when the press roller 4 is pressed against the plate cylinder.

By the pressing operation described above, the press roller 4
The printing paper P, the master 16 and the plate cylinder 3 are pressed against each other, and the ink supplied from the ink roller 21 to the inner peripheral surface of the plate cylinder 3 exudes from the openings of the plate cylinder 3 and the plate cylinder 3 is not shown. The porous support plate, a mesh screen (not shown), and the porous support of the master 16 are filled, and then transferred to the printing paper P through the perforated portion of the master 16 to perform printing.
When the transfer of the image to the printing paper P is completed, the press roller 4 is separated from the plate cylinder 3, and the press roller 4 is again held at the separated position by the press roller holding means.

The printing paper P having the images transferred on both sides is peeled from the outer peripheral surface of the plate cylinder 3 by the tip of the peeling claw 34 and is sent to the left. The printing paper P sent to the left is further moved to the left while the image surface previously transferred by the suction force of the suction fan 39 is attracted to the endless belt 38,
The sheet is discharged onto the sheet discharge tray 95. After that, each plate cylinder 3,5
9 is rotated to the home position and stopped, and the stencil printing apparatus 50 and the printing unit 1 are put in a print standby state after the printing operation is completed.

After that, when the stencil printing apparatus 50 and the trial printing key (not shown) of the printing unit 1 are respectively pressed after the various printing conditions are input, one sheet of printing paper P is fed from the paper feeding section 53 and at the same time. Each of the plate cylinders 3, 59 is rotationally driven at a higher speed than at the time of printing, and a test printing is performed. After the trial printing, when the print start key (not shown) of the stencil printing apparatus 50 and the printing unit 1 is pressed after the number of printed sheets is set, the printing paper P is continuously fed from the paper feeding unit 53 to print. Is done. After the printing operation is completed, each plate cylinder 3, 59 returns to the home position again.

During the above-described test printing and printing, the sheet conveying speed of the sheet discharge conveying member 94 on the side of the stencil printer 50 is generally set to the plate cylinder 59 for the purpose of applying tension to the printed printing sheet P. It is set to be faster than the peripheral speed of rotation. Therefore, if the sheet conveying speed by the sheet conveying means 5 and the rotation peripheral speed of the plate cylinder 3 are the same as the rotation peripheral speed of the plate cylinder 59, the speed on the paper feeding side becomes faster than the speed on the paper receiving side. The slack is generated in the printing paper P, which makes it difficult to feed the paper normally. Therefore, in the present embodiment, the sheet conveying speed by the sheet conveying means 5 and the rotational peripheral speed of the plate cylinder 3 are set to be the same as the sheet conveying speed by the discharged sheet conveying member 94. As a result, the paper can be conveyed without causing slack, and a good printed matter can be obtained. When the paper transport speed of the paper discharge transport member 94 is variable, the paper transport speed of the paper transport means 5 and the rotational peripheral speed of the plate cylinder 3 are also variable accordingly.

The printing unit 1 is provided in the vicinity of the drive roller 32a and the press roller 4 which come into contact with the printing surface of the printing paper P which is printed on one surface during printing, trial printing and printing. Cleaning rollers 33, 25 are arranged which are in contact with the peripheral surface and rotate in the same direction. As a result, the printing paper P is moved to the drive roller 32.
The ink transferred to the a and the press roller 4 is scraped off and spread by the cleaning rollers 33 and 25, whereby drying is promoted and retransfer to the next printing paper P is prevented. In this embodiment, as the cleaning means, the cleaning roller 33 which comes into contact with the driving roller 32a and the peripheral surface of the press roller 4,
Although 25 is used, instead of the cleaning rollers 33 and 25, a blade-shaped cleaning unit that is in pressure contact with the peripheral surfaces of the drive roller 32a and the press roller 4 is arranged, and a plurality of cleaning rollers is arranged. May be adopted.

With the above arrangement, according to the first embodiment of the present invention, by connecting the printing unit 1 to the stencil printing apparatus 50 having a general arrangement, a double-sided printed matter can be easily obtained without increasing the cost. Moreover, since the printing unit 1 can be easily attached and detached, the one-sided printed matter can be easily obtained. Further, since the press roller 4 and the drive roller 32a that are in contact with the printing surface are in contact with the cleaning rollers 25 and 33, respectively, the press roller 4
Also, it is possible to prevent retransfer of ink from the drive roller 32a to the printing paper P, and it is possible to obtain a good printed matter. Further, since the press roller 4 is arranged above the plate cylinder 3 and the drive roller 32a is also arranged above the unit main body 9, it is possible to easily clean the rollers 4, 32a and the cleaning rollers 25, 33. You can

FIG. 6 shows a schematic front view of a printing unit used in the second embodiment of the present invention. The printing unit 118 includes a plate cylinder 119, a transfer cylinder 120, a press roller 121 as a pressing unit, a sheet conveying unit 122,
It has a paper output unit 123.

Similar to the plate cylinder 3 shown in the first embodiment, the plate cylinder 119 has a pair of flanges (not shown), a porous support plate (not shown), and a mesh screen (not shown). The support plate and the mesh screen are rotatably supported by a support shaft 125 which also serves as an ink supply pipe, and are rotationally driven by a plate cylinder driving means 150 described later. A clamper 127 having a structure similar to that of the clamper 18 is disposed in the non-opened portion on the outer peripheral surface of the plate cylinder 119, and an ink supply unit 128 is disposed inside thereof. The ink supply means 128 includes a support shaft 125,
It has an ink supply pipe 129, an ink roller 130, a doctor roller 131 and the like.
An ink pool 132 having a wedge-shaped cross section is formed in the vicinity of the doctor roller 131.

The plate cylinder 119 is shown in FIGS.
As shown in (c), brackets 133 and 134 are attached to both ends of the support shaft 125.
33 and 134 are integrally connected by a connecting bracket 135. The plate cylinder 119 is configured to be attachable to and detachable from the unit body 126 by engaging and disengaging the connecting bracket 135 with the rail member 136 provided on the unit body 126, and is connected to the printing unit 118 of the stencil printing apparatus. It is also configured to be detachable from the main body of the printing apparatus. The bracket 133 is provided with a handle 133a that is gripped when the plate cylinder 119 is attached and detached, and a handle 135a is also provided above the connecting bracket 135. Further, a dog 137 for detecting the position of the plate cylinder 119 is provided on the side surface of the plate cylinder 119 on which the bracket 134 is attached, and a plate is installed when the plate cylinder 119 is attached to the unit main body 126 or the printing apparatus main body. Body drive means 1
50 or a drive gear 138 for transmitting a driving force from a plate cylinder driving means (not shown) provided in the main body of the printing apparatus.
And are attached. As shown in FIG. 7, the dog 137 has a predetermined angle α formed by its center line toward the center of the plate cylinder 119 and the center line of the clamper 127.
It is attached to the position.

As shown in FIG. 8, the home position sensor 139 for detecting the dog 137 when the plate cylinder 119 is mounted on the unit main body 126 and the second position on the far side of the plate cylinder 119 mounting position of the unit main body 126. A position sensor 140 is provided. The home position sensor 139 is provided at a position where the dog 137 is detected when the plate cylinder 119 occupies a position right above the clamper 127, and the second position sensor 140 is used for the plate cylinder 1
19 is provided at a position for detecting the dog 137 when the clamper 127 occupies the position shown in FIG. The plate cylinder 119 is configured to be attachable / detachable to / from the unit body 126 only at the home position, and its rotation is restricted by a detent mechanism (not shown) at the time of attachment / detachment.

On the upper left side of the plate cylinder 119, a transfer cylinder 120 having the same diameter as the plate cylinder 119 is arranged. Transfer cylinder 1
Reference numeral 20 is rotatably supported by the unit main body 126 by a support shaft 120a, and the driving force from the plate cylinder driving means 150 is transmitted to the plate cylinder 119 so as to be in contact with the plate cylinder 119 and synchronously rotated in the arrow direction of FIG. It The transfer cylinder 120 has a peripheral surface made of a material such as nitrile rubber that easily holds ink, and a cutout 120b for avoiding contact with the clamper 127 is formed on a part of the peripheral surface. There is.

At the lower left of the transfer cylinder 120, the transfer cylinder 120
Transfer drum cleaning means 14 for cleaning the peripheral surface of the
1 is provided. Transfer cylinder cleaning means 141
Is the cleaning roller 142, the sheet roller 14
3, a moving bracket 144, a moving motor 145, a sheet holding unit 146, a sheet winding member 147, and the like.

The cleaning roller 142 is rotatably supported by the moving bracket 144, and is rotationally driven in the same direction as the transfer cylinder 120 by a driving means (not shown). The sheet roller 143 is rotatably supported by the moving bracket 144, and is pressed against the cleaning roller 142 by a biasing means (not shown). The moving bracket 144 having the rack portion 144a on one side is
It is movably supported by the unit body 126. The moving motor 145 fixed to the unit main body 126 has a gear 145a on its output shaft, and the gear 145a meshes with an idle gear 148 rotatably supported by the unit main body 126 while meshing with the rack portion 144a. is doing. The moving bracket 144 causes the cleaning roller 142 to move by the operation of the moving motor 145.
6 and the position shown in FIG. 9 in which the cleaning roller 142 is separated from the peripheral surface of the transfer drum 120 is selectively moved.

The sheet holding means 146 rotatably and detachably supports the core portion 149b of the cleaning sheet roll 149a formed by winding the cleaning sheet 149 in a roll shape. The cleaning sheet 149 is sandwiched by a nip portion between the cleaning roller 142 and the sheet roller 143, and one end thereof is held by the sheet winding member 147. The sheet winding member 147 is rotationally driven in the arrow direction of FIG. 6 by a winding motor (not shown), and the cleaning sheet 149 is wound around the peripheral surface thereof.

A press roller 1 is provided above the transfer cylinder 120.
21 are provided. The press roller 121 is rotatably supported at both ends on the first tops of a pair of press roller arms 165 having a substantially triangular shape.
The second top of each press roller arm 165 is swingably supported by the unit body 126. Each press roller arm 165 is rocked by a rocking means (not shown), and the press roller 121 has a press contact position where the peripheral surface of the press roller 121 is in press contact with the transfer cylinder 120 and a peripheral surface of the press roller 121.
It is selectively displaced to a further separated position shown in FIG. The press roller 1 is provided near the swinging means (not shown).
A press roller holding means (not shown) for holding 21 at the separated position is provided.

On the right side of the transfer cylinder 120, the sheet conveying means 12
2 are provided. The sheet conveying unit 122 includes a driving roller 166, a driven roller 167, an endless belt 168,
It is configured by a conveyor having a suction fan 169 and the like, and conveys the printing paper P taken in from a paper intake (not shown) provided in the unit main body 126. The drive roller 166 and the driven roller 167 are rotatably supported by a carrier frame (not shown),
The driving roller 166 is rotationally driven in the counterclockwise direction in the figure by a driving unit (not shown). A plurality of endless belts 168 are wound around a driving roller 166 and a driven roller 167, and each endless belt 168 has a plurality of openings. The suction fan 169 is attached to the lower side of a conveyor frame (not shown), and the endless belt 1
The printing paper P conveyed on 68 is sucked from below and held on the endless belt 168.

A guide plate 170 for guiding the conveyance of the printing paper P is provided on the downstream side of the paper conveyance means 122 in the paper conveyance direction.
171 and a resist roller pair 172 are arranged. Each of the guide plates 170 and 171 is fixed to a side plate (not shown) of the unit main body 126, and the sheet conveying means 122.
The printing paper conveyed by the registration roller pair 17
Guide to 2. The registration roller pair 172 includes a driving roller 172a that is rotationally driven by a driving unit and a driven roller 17 that is arranged in pressure contact with the driving roller 172a.
2b, and each of the rollers 172a and 172b is rotatably supported by a side plate (not shown) of the unit main body 126.

A paper detection sensor 173 is provided at a position upstream of the registration roller pair 172 in the paper conveyance direction. Paper detection sensor 17 consisting of a reflective sensor
3 is arranged below the guide plate 171, and detects when the leading edge of the printing paper P conveyed by the paper conveying means 122 is nipped by the registration roller pair 172. The paper detection signal output from the paper detection sensor 173 is output to a control unit (not shown) that controls the printing unit 118, and the control unit (not shown) receives the signal and controls the operation of the printing unit 118.

Press roller 121 and drive roller 1
A cleaning device 174 for cleaning the surface of the press roller 121 and the surface of the drive roller 172a is disposed above 72a. Cleaning device 1
74 has a cleaning roller 175 as a cleaning means, a sheet roller 176, a sheet roller 177 as a resist cleaning means, a tension roller 178, a sheet holding means 179, a sheet winding member 180, and the like.

Both ends of the cleaning roller 175 are rotatably supported by the third top of the press roller arm 165, and the peripheral surface of the cleaning roller 175 is arranged in pressure contact with the peripheral surface of the press roller 121 at a predetermined pressure. The press roller 1 at the time of pressure contact with the transfer cylinder by a driving unit (not shown)
It is rotationally driven in the same direction as 21. Press roller 121
The pressing force of the cleaning roller 175 with respect to the transfer roller 120 is set to be smaller than the pressing force of the press roller 121 with respect to the transfer cylinder 120, and the press roller 121 rotates following the transfer cylinder 120 during the press contact with the transfer cylinder 120.

A sheet roller 176 is arranged near the cleaning roller 175. The sheet roller 176 is rotatably supported by the unit body 126, and is separated from the cleaning roller 175 when the press roller 121 occupies the contact position.
Cleaning roller 1 when 21 occupies the separated position
It is arranged at a position in contact with 75. The sheet roller 177 is arranged above the drive roller 172a and at a position where the peripheral surface of the sheet roller 177 is in contact.

The sheet holding means 179 rotatably and detachably supports the core portion 181b of the cleaning sheet roll 181a formed by winding the cleaning sheet 181 in a roll shape. The cleaning sheet 181 is wound around the peripheral surfaces of the sheet rollers 176 and 177, and then one end of the cleaning sheet 181 is held by the sheet winding member 180.
The sheet winding member 180 is rotationally driven in the arrow direction of FIG. 6 by a winding motor (not shown), and the cleaning sheet 181 is wound around the peripheral surface thereof. A tension roller 178 rotatably and movably supported by the unit main body 126 is disposed between the sheet rollers 176 and 177. Tension roller 178
Applies a predetermined tension to the cleaning sheet 181 wrapped around the peripheral surfaces of the sheet rollers 176 and 177.

A paper discharge section 123 is disposed downstream of the transfer cylinder 120 and the press roller 121 in the paper transport direction. The paper discharge unit 123 includes the peeling claw 182 and the paper discharge conveyance member 18.
3 and 3. The peeling claw 182 has a support shaft 182a.
Is rotatably supported by the unit main body 126, and its tip is selectively moved by a not-shown claw swinging device at a position close to the outer peripheral surface of the transfer drum 120 and a position separated from the outer peripheral surface of the transfer drum 120. It is rocked.

The discharged sheet carrying member 183 is the driving roller 18
4, a driven roller 185, an endless belt 186, a suction fan 187, and the like. The drive roller 184 and the driven roller 185 are rotatably supported by a transport member frame (not shown), and the drive roller 184 is rotationally driven in the clockwise direction in the figure by a drive unit (not shown). A plurality of endless belts 186 are wound around a driving roller 184 and a driven roller 185, and each endless belt 186 has a plurality of openings. The suction fan 187 is attached to the upper side of a transport member frame (not shown), and sucks the printing paper P transported below the endless belt 186 to hold it on the endless belt 186.

On the upper part of the unit main body 126, an openable / closable lid 124 is provided. By opening the lid 124, the cleaning roller 175 is cleaned,
The cleaning sheet roll 181a is configured to be replaceable. Further, a lid (not shown) is provided on the side plate of the unit main body 126 located on the front side of the transfer cylinder cleaning means 141, and the cleaning sheet roll 149a can be replaced by opening the lid.

A tray mounting portion (not shown) for mounting a paper discharge tray of the stencil printing machine is provided at the left side of the unit main body 126 and below the paper discharge portion 123. On the right side of 126, a connection portion (not shown) for connecting the printing unit 118 to the stencil printing machine is provided. The connection part (not shown) is a positioning part (not shown) for positioning the printing unit 118 with respect to the stencil printing apparatus with the discharge tray removed, and a drawing part for fixing the printing unit 118 to the stencil printing apparatus. It does not have a fixed part.

FIG. 10 shows a plate cylinder driving means for rotationally driving the plate cylinder 119 and the transfer cylinder 120. The plate cylinder driving means 150 has a plate cylinder driving motor 151, a vertical movement means 152 as a displacement means, and the like. The plate cylinder drive motor 151 is arranged on the inner side of the unit main body 126, and has a timing pulley 151a on its output shaft. One end of the timing belt 153 is hooked on the timing pulley 151a, and the other end of the timing belt 153 is hooked on the timing pulley 154 fixed to the end surface of the transfer cylinder 120 on the inner side of the apparatus. A timing pulley 154 is provided on the end surface of the transfer cylinder 120 on the rear side of the apparatus.
A timing pulley 155 having a diameter larger than that of the timing pulley 154 is integrally mounted coaxially with
The timing belt 1 is attached to the timing pulley 155.
One end of 56 is hung. In addition, the unit body 12
At the back side of 6, the plate cylinder 119 with respect to the unit main body 126
A transmission gear 157, which meshes with the drive gear 138 when is mounted, is rotatably mounted, and the timing belt 156 is coaxially mounted on the transmission gear 157 via the up-and-down moving means 152.
A timing pulley 158 with the other end of which is hung is attached integrally with the transmission gear 157. With this configuration, the plate cylinder drive motor 151 is operated and the timing belt 153 is moved in the direction of the arrow in the figure, so that the plate cylinder 119 and the transfer cylinder 120 are synchronized in the directions of the arrows in the opposite directions. Driven to rotate.

As shown in FIG. 11, the up-and-down moving means 152 includes a moving frame 159, up-and-down moving motors 160, 4
It has individual tension pulleys 161 and the like. The moving frame 159 having a rectangular shape has an elongated hole 15 at its center.
9a, and the male screw 159b is integrally formed on the upper end thereof. The moving frame 159 has the guide pin 162 implanted in the unit body 126 and the elongated hole 159a.
Is guided by a guide member (not shown) and is guided by the guide member, and is supported so as to be movable in the vertical direction in FIG. Also, the long hole 1 on the moving frame 159
Two timing pulleys 163, each of which is rotatable and around which a timing belt 156 is stretched, are arranged near both ends of 59a.

The up-and-down movement motor 160 attached to the unit body 126 has an output gear 160a on its output shaft.
have. The output gear 160a is meshed with a transmission gear 164 having a female screw that meshes with a male screw 159b at its center, and the transmission gear 164 is rotatably supported at a fixed position shown in FIG. 11 by a support member (not shown). Contacting the back side of the timing belt 156 4
The tension pulley 161 is the unit body 126.
Is rotatably supported by brackets (not shown) that are movably attached to the timing belt 1.
The tension applied to 56 is adjustable.

With the above structure, the plate cylinder drive motor 151
10 is stopped and the up-and-down movement motor 160 is operated to move the moving frame 159 toward, for example, the lower side in FIG. 10, so that only the plate cylinder 119 is stopped and the transfer cylinder 120 is stopped. Can be rotated in the opposite direction, and the phases of the plate cylinder 119 and the transfer cylinder 120 can be changed.

FIG. 12 shows a stencil printing machine used in the second embodiment of the present invention. This stencil printer 18
8 is different from the stencil printing apparatus 50 used in the first embodiment only in that a printing unit 189 is provided instead of the printing unit 51, and the other configurations are the same.

The printing section 189 has a plate cylinder 190 and a press roller 60. Plate cylinder 19 with the same diameter as plate cylinder 119
0 is a clamper 62 on the outside and ink supply means 6 on the inside.
5, and the brackets 191 and 192 similar to the plate cylinder 119 are provided at both ends of the support shaft 61. The brackets 191 and 192 are integrally connected by a connecting bracket 193, and a handle 194 is attached to the bracket 191 and a handle 195 is attached to the connecting bracket 193. The printing unit 189 is provided with a rail member 196 that engages and holds the connection bracket 193, and the plate cylinder 1
Reference numeral 90 is configured to be attachable to and detachable from the printer main body 58. This rail member 196 has a connecting bracket 135.
The printing apparatus main body 58 is also configured such that the plate cylinder 119 can be mounted. A plate cylinder driving means (not shown) that can be connected to the drive gear 138 is provided on the rear side of the plate body mounting position of the printing apparatus main body 58.

Further, a dog 19 for detecting the position of the plate cylinder 190 is provided on the side surface of the plate cylinder 190 located on the inner side of the apparatus.
7 and a drive gear (not shown) for transmitting a driving force from a plate cylinder driving means (not shown) when the plate cylinder 190 is mounted on the printing apparatus main body 58. Dog 1
In the case of the dog 137, the angle formed by the center line of the plate cylinder 190 toward the center of the plate cylinder 190 and the center line of the clamper 62 is dog 137.
Of the center line of the clamper 127 and the center line of the clamper 127.

As shown in FIG. 13, when the plate cylinder 190 or the plate cylinder 119 is mounted on the printing apparatus main body 58, the dog 1 is mounted on the back side of the plate cylinder 190 mounting position of the printing apparatus main body 58.
A home position sensor 198 for detecting 97 or the dog 137 and a plate feeding position sensor 199 are provided. The home position sensor 198 is a plate cylinder 19
0 and 119 are provided at positions where dogs 197 and 137 are detected when the clampers 62 and 127 are located directly above, and the plate feeding position sensor 199 is provided at the plate cylinder 19
0 and 119 are provided at positions where the dogs 197 and 137 are detected when the clampers 62 and 127 occupy positions corresponding to the master 73 sent from the master transport roller pair 72. The plate cylinders 190 and 119 are configured to be attachable / detachable to / from the printing apparatus main body 58 only at the home position. When the plate cylinder 190 is attached / detached, the rotation thereof is restricted by a rotation preventing mechanism (not shown).

Based on the above configuration, the stencil printing machine 188
An operation in the case of connecting the printing unit 118 to and performing one-step double-sided printing will be described. Prior to printing, first, the paper discharge tray 95 is removed from the stencil printing apparatus 188, and this is attached to the printing unit 118. Next, the sheet discharge port (not shown) of the printer body 58 and the sheet inlet (not shown) of the unit body 126 are aligned, and the unit body 126 and the printer body 58 are fixed by the connecting member 116 as shown in FIG. As a result, the printing unit 118 and the stencil printing device 188 are connected. At the time of this connection, the printing unit 118 and the stencil printing device 188 are also electrically connected by a connector (not shown), and the printing unit 118 is supplied with power from the stencil printing device 188 to operate.

The printing unit 118 is attached to the stencil printing device 188.
After connecting, the operator places a document of a normal image to be formed on the front surface side (rear surface side) of the printing paper P on the image reading unit 56, and is not shown provided on the operation panel (not shown) of the stencil printing device 188. Press the plate making start key. When the plate making start key is pressed, the image reading unit 56 displays the first
Similar to the embodiment described above, the reading operation of the original image is performed. The read image is photoelectrically converted and then input to an A / D converter (not shown) in the printer body 58.

In parallel with the image reading operation of the image reading section 56, the plate discharging section 54 performs the plate discharging operation as in the first embodiment. When the plate discharge operation is completed, the plate cylinder 190 moves to the dog 19
7 rotates to the position detected by the plate feeding position sensor 199 and stops. After the plate cylinder 190 is stopped, the opening / closing means (not shown) is actuated to open the clamper 62, and the stencil printing machine 188 is in a standby state for feeding the plate cylinder 190.

When the clamper 62 is opened, the plate making operation and the plate feeding operation are subsequently performed as in the first embodiment.
The plate cylinder 190 around which the master 73 for one plate that has been made is wound is rotated clockwise in FIG. 14, and the dog 197 is rotated to a position detected by the home position sensor 198 and stopped. When the plate cylinder 190, on which the new plate-making master 73 is wound on the outer peripheral surface, is positioned at the home position, the operator removes the plate cylinder 190 from the printing apparatus main body 58 and temporarily stores it in another place. .

Next, the operator operates the printing unit 118.
The plate cylinder 119 is removed from the. The operator presses a plate cylinder removal key provided on an operation panel (not shown) of the printing unit 118. When the plate cylinder removal key is pressed, the up-and-down movement motor 16 of the up-and-down movement means 152 is moved.
0 operates to move the moving frame 159 to the upper side in FIGS. 10 and 11, and the plate cylinder 119 rotates in the direction of the arrow from the position where the clamper 127 shown in FIG. 14 faces the notch 120b. Start. Then, when the dog 137 is detected by the home position sensor 139, the operation of the vertical movement motor 160 is stopped, and the plate cylinder 119 is positioned at the home position where the clamper 127 is located right above. When the plate cylinder 119 is positioned at the home position, the operator moves the plate cylinder 119 to the printing unit 11.
It is detached from the printer 8 and attached to the printer body 58.

After the plate cylinder 119 is mounted on the printing apparatus main body 58, the operator places the original of the mirror image formed on the back side (front side) of the printing paper P on the image reading unit 56, and the stencil printing apparatus 188 is operated. A plate-making start key (not shown) provided on an operation panel (not shown) is pressed. When the plate-making start key is pressed, the reading operation of the original image is performed in the same manner as described above, and the read image is photoelectrically converted and then input to the A / D converter (not shown) in the printer main body 58.

In parallel with the image reading operation of the image reading section 56, the plate discharging section 54 performs the plate discharging operation as described above.
When the plate discharge operation is completed, the plate cylinder 119 rotates to a position where the dog 137 is detected by the plate supply position sensor 199 and stops. After the plate cylinder 119 is stopped, the opening / closing means (not shown) is actuated to open the clamper 127, and the stencil printing machine 188 is in a standby state for feeding the plate cylinder 119.

When the clamper 127 is opened, the plate making operation and the plate feeding operation are subsequently performed in the same manner as described above. The plate cylinder 119 around which the master 73 for one plate that has been made is wound is rotated to a position where the dog 137 is detected by the home position sensor 198 and stopped. When the plate cylinder 119 on which the new plate-making master 73 is wound is positioned at the home position on the outer peripheral surface, the operator moves the plate cylinder 119.
Is removed from the printer body 58, and the unit body 1 is again attached.
Attach to 18.

After mounting the plate cylinder 119 on the unit main body 118, the operator presses a plate cylinder attachment key provided on an operation panel (not shown) of the printing unit 118.
When the plate cylinder attachment key is pressed, the printing unit 118
The control means (not shown) is the home position sensor 13
After confirming that 9 detects the dog 137, the up-and-down movement motor 160 is operated. Vertical movement motor 1
When 60 is operated, the moving frame 159 is moved to the position shown in FIGS.
, The plate cylinder 119 starts to rotate in the direction opposite to the arrow in FIG. Then, when the dog 137 is detected by the second position sensor 140, the operation of the up-and-down movement motor 160 is stopped, the plate cylinder 119 is positioned at a position shown in FIG. The mounting of the plate cylinder 119 on the plate is completed.

When the mounting of the plate cylinder 119 to the unit main body 118 is completed, the operator again mounts the plate cylinder 190 stored in another place on the printing apparatus main body 58, and then the operator of the stencil printing apparatus 188 and the printing unit 118. A printing key (not shown) provided on an operation panel (not shown) is pressed down. When the printing key is pressed, the paper feed roller 75, the upper roller 76a, the drive roller 96, the suction fan 99, the drive roller 166, the suction fan 169, the drive roller 184, and the suction fan 187 are driven and the plate cylinder 190 is driven. Also, the plate cylinder 119 and the transfer cylinder 120 are rotationally driven at low speed in the directions of the arrows in FIG. 14, and the uppermost one sheet of the printing paper P stacked on the paper feed tray 74 is pulled out. The pulled-out printing paper P is pinched at its leading end by the pair of registration rollers 77, and is fed between the plate cylinder 190 and the press roller 60 at the same timing as in the first embodiment.

Printing paper P by registration roller pair 77
The press roller 60 is released from the holding by the press roller holding means (not shown) at almost the same time as the sheet feeding, and the press roller 60 is pressed against the plate cylinder 190 by a predetermined pressing force. By this pressure contact, the press roller 60 and the printing paper P
The master 73 and the plate cylinder 190 are brought into pressure contact with each other, and the printing is performed in the same manner as in the first embodiment. After printing, press roller 6
0 is held at the separated position again by the press roller holding means, and the printing paper P having the image transferred on one surface thereof is peeled from the outer peripheral surface of the plate cylinder 190 by the peeling claw 92,
The sheet is conveyed onto the discharged sheet conveying member 94.

The printing paper P sent to the discharged paper carrying member 94
Is conveyed leftward while its non-image surface is attracted to the upper surface of the endless belt 98 by the suction force of the suction fan 99, and is discharged to the outside of the printing apparatus main body 58 from a sheet discharge port (not shown). The printing paper P ejected from a paper ejection port (not shown) is taken into the inside of the unit main body 126 from a paper inlet (not shown) connected to the printing paper P, and is delivered to the paper conveyance means 122. The printing paper P sent to the paper carrying means 122 is carried to the left while its non-image surface is attracted to the upper surface of the endless belt 168 by the suction force of the suction fan 169, and its leading end is paired with the registration roller pair 1.
Abut on the nip portion of 72. At this time, a detection signal is output from the paper detection sensor 173 that detects the leading edge of the printing paper P to the control unit (not shown) of the printing unit 118.

While the stencil printing device 188 side is performing the plate making operation, the plate cylinder 119 and the transfer cylinder 120 are synchronously rotated on the printing unit 118 side. Support shaft 12
5 and the ink supply pipe 129, the ink roller 13
The ink supplied to No. 0 oozes out after the plate cylinder 119 and the transfer cylinder 120 come into contact with each other to be filled from the inner peripheral surface of the plate cylinder 119 to a porous support plate (not shown) and a mesh screen (not shown) forming the plate cylinder 119. Then, the plate is transferred by being transferred to the peripheral surface of the transfer cylinder 120 through the perforated portion of the master 73. At this time, since the plate cylinder 119 and the transfer cylinder 120 have the same diameter and rotate synchronously, the ink from the plate cylinder 119 is always transferred to the fixed position of the transfer cylinder 120, and no image dripping occurs.

The control means (not shown), which receives the signal from the paper detection sensor 173, moves from the plate cylinder 119 to the transfer cylinder 120.
The drive roller 172a is rotationally driven at a predetermined timing when the front end portion of the image transferred to the transfer roller in the rotation direction of the transfer cylinder reaches a position corresponding to the press roller 121. As a result, the printing paper P nipped by the pair of registration rollers 172 is fed between the transfer cylinder 120 and the press roller 121, and at the same time as the rotation of the drive roller 172a, the press roller 1 by the press roller holding means (not shown).
When the holding of 21 is released, the printing paper P is pressed against the peripheral surface of the transfer cylinder 120 by the press roller 121, and the image is transferred to both surfaces thereof. When the transfer of the image onto the printing paper P is completed, the press roller 121 is moved to the transfer cylinder 12.
After being separated from 0, the press roller 121 is again held at the separated position by the press roller holding means.

The printing paper P having the images transferred on both sides is peeled from the peripheral surface of the transfer drum 120 at the tip of the peeling claw 182 and is sent to the left. The printing paper P sent to the left is further conveyed to the left while being attracted by the endless belt 186 to the image surface previously transferred by the suction force of the suction fan 187, and is discharged onto the paper discharge tray 95. It After that, the plate cylinder 190 rotates to the home position shown in FIG. 14 and stops, and the plate cylinder 119 and the transfer cylinder 120 move to the home position shown in FIG.
After rotating to the initial position shown in (4) and stopping, the printing operation is completed and the stencil printing apparatus 188 and the printing unit 118 enter the printing standby state.

After that, when the stencil printing device 188 and the test printing key (not shown) of the printing unit 118 are respectively pressed after the various printing conditions are input, one sheet of printing paper P is fed from the paper feeding unit 53 and Each plate cylinder 190, 11
9 and the transfer cylinder 120 are rotationally driven at a speed higher than that at the time of printing, and a trial printing is performed. After the trial printing, after the number of printed sheets is set, the stencil printing apparatus 188 and the printing unit 118
When a print start key (not shown) is pressed, the printing paper P is continuously fed from the paper feeding unit 53 and printing is performed. After the printing operation is completed, the plate cylinder 190 returns to the home position, and the plate cylinder 119 and the transfer cylinder 120 return to the initial positions.

Also in the second embodiment, the sheet conveying speed by the sheet conveying means 122, the rotational peripheral speed of the plate cylinder 119, and the rotational peripheral speed of the transfer cylinder 120 are set to be the same as the sheet conveying speed by the discharged sheet conveying member 94. There is. This makes the first
It is possible to obtain the same effect as that of the embodiment.

Further, the printing unit 118 has a driving roller 172a which comes into contact with the printing surface of the printing paper P printed on one surface during printing, trial printing, and printing.
In the vicinity of the press roller 121, a cleaning device 174 having sheet rollers 177 and 176 that come into contact with the respective peripheral surfaces of the cleaning sheet 181 is disposed. The cleaning device 174 controls the sheet winding member 180 of FIG. 14 when the drive roller 172a is rotated and when the press roller 121 is separated from the transfer cylinder 120 (when the cleaning roller 175 and the sheet roller 176 are in contact) by a control unit (not shown). Rotate it in the direction of the arrow. As a result, the ink transferred from the printing paper P to the driving roller 172a and the press roller 121 is scraped off by the cleaning sheet 181 and is spread, whereby drying is promoted and re-transferred to the next printing paper P is prevented. To be done.

In this embodiment, the cleaning device 17
4 was used, but instead of the cleaning device 174, the cleaning rollers 33, 25, and / or the cleaning rollers 33 and 25 shown in the first embodiment are used.
Alternatively, a blade-shaped cleaning means is used as the driving roller 1.
72a and the cleaning roller 175 may be arranged in the vicinity thereof, a plurality of cleaning rollers may be arranged, a cleaning device 174 and a roller-shaped and / or blade-shaped cleaning means may be provided side by side.

Further, the printing unit 118 is provided with a transfer cylinder cleaning means 141. As described above, since the plate cylinder 119 and the transfer cylinder 120 have the same diameter and rotate in synchronization, the image from the plate cylinder 119 is always transferred in a fixed position on the peripheral surface of the transfer cylinder 120. Therefore, the transfer cylinder 120 by the transfer cylinder cleaning unit 141 is
Cleaning is done only when changing the plate. The cleaning operation of the transfer drum 120 by the transfer drum cleaning means 141 will be described below.

When changing the plate, the operator first presses the plate cylinder removal key provided on the operation panel (not shown) of the printing unit 118, and the up-and-down movement motor 160 is moved.
Is operated to position the plate cylinder 119 at the home position, remove the plate cylinder 119 from the unit main body 126, and temporarily store it at a predetermined position.

After removing the plate cylinder 119 from the unit main body 126, the operator depresses a transfer cylinder cleaning key provided on an operation panel (not shown). When the transfer cylinder cleaning key is pressed, the moving motor 145 operates and the moving bracket 144 moves from the state shown in FIG. 9 toward the transfer cylinder 120, and the cleaning roller 142 of the transfer cylinder 120 is pressed by a predetermined pressing force. Press against the peripheral surface. Thereafter, the plate cylinder drive motor 151 is operated to rotationally drive the transfer cylinder 120 in the direction of the arrow in FIG. 6, and the driving means (not shown) is operated to clean the cleaning roller 142.
Is rotationally driven in the direction of the arrow in FIG. 6, and the sheet winding member 147 is rotationally driven in the direction of the arrow in FIG.

As a result, the ink transferred from the plate cylinder 119 to the transfer cylinder 120 is scraped off by the cleaning roller 142, and the ink attached to the cleaning roller 142 is wiped off by the cleaning sheet 149. Then, this cleaning is repeated by rotating the transfer drum 120 a plurality of times, and almost all of the ink transferred from the plate drum 119 to the transfer drum 120 is scraped off by the cleaning roller 142, and the transfer drum 1 is transferred.
20 is cleaned.

Instead of the transfer cylinder cleaning means 141,
The transfer drum cleaning means 200 shown in FIGS. 15 and 16 may be used. The transfer cylinder cleaning unit 200 includes a moving bracket 201, a cleaning roller 202, a sheet roller 203, a solenoid 204, a sheet holding unit 205, a sheet winding member 206, and the like.

The cleaning roller 202 is rotatably supported at one end of the moving bracket 201, and is rotationally driven in the same direction as the transfer cylinder 120 by a driving means (not shown). The sheet roller 203 is a moving bracket 201.
Is rotatably supported at one end thereof and is pressed against the cleaning roller 202 by a biasing means (not shown).

Moving bracket 20 having a substantially T-shape
1 is rotatably supported by a pin 207 planted in the unit main body 126 at substantially the center thereof. Solenoid 204 fixed to the unit body 126
Has its plunger attached to the other end of the moving bracket 201, and one end near the other end of the unit main body 12
The other end of the tension spring 208 attached to 6 is attached. The moving bracket 201 includes a solenoid 204
15, the peripheral surface of the cleaning roller 202 occupies the position shown in FIG. 15 where it contacts the peripheral surface of the transfer drum 120, and the peripheral surface of the cleaning roller 202 is separated from the peripheral surface of the transfer drum 120 when the solenoid 204 is inactive. 16 occupies the position shown in FIG.

The sheet holding means 205 rotatably and detachably supports the core portion 149b of the cleaning sheet roll 149a, and the sheet winding member 206 rotatably driven in the direction of the arrow by a winding motor (not shown).
The end of the cleaning sheet 149 is attached to the. The cleaning sheet 149 is nipped in the nip portion between the cleaning roller 202 and the sheet roller 203. By using this transfer drum cleaning means 200, it is possible to obtain the same effects as those of the transfer drum cleaning means 141.

With the above arrangement, according to the second embodiment of the present invention, the stencil printing apparatus 18 having the plate cylinder attaching / detaching function is used by using the printing unit 118 having no plate making section and plate discharge section.
By connecting the printing unit 118 to 8, it is possible to easily obtain a double-sided printed matter and further reduce costs.

[0136]

According to the present invention, by connecting a printing unit to a stencil printing apparatus having a general structure, a double-sided printed matter can be easily obtained without increasing the cost, and the printing unit can be easily attached and detached. It is possible to easily obtain a single-sided printed matter. Further, a double-sided printed matter can be easily obtained by using a printing unit that does not have a plate making section and a plate discharging section and connecting this printing unit to a stencil printing apparatus having a plate cylinder attachment / detachment function, and further cost reduction is aimed at. It becomes possible.

Further, since the pressing means and the resist roller pair which come into contact with the printing surface respectively have the cleaning means and the resist cleaning means, it is possible to prevent the retransfer of the ink from the pressing means and the resist roller pair to the printing paper, Good double-sided printed matter can be obtained. Further, since the pressing means is arranged above the plate cylinder, and the registration roller pair is also arranged above the unit main body, it is possible to easily carry out cleaning of each unit.

[0138] Further, by setting the paper conveying speed by the paper conveying means and the peripheral speed of rotation of the plate cylinder to be the same as the conveying speed of the printed paper discharged from the stencil printing machine, the speed is higher than that of the paper receiving side. It is possible to prevent the occurrence of slack on the printing paper due to the increase in the speed of the paper feeding side, and it is possible to obtain a good printed matter. Further, by sharing the paper discharge tray between the stencil printing apparatus and the printing unit, the existing paper discharge tray can be used without wasting, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic front view of a printing unit that employs a first embodiment of the present invention.

FIG. 2 is a schematic front view illustrating a printing unit that employs the first embodiment of the present invention.

FIG. 3 is a schematic front view of a printing unit showing a modification of the first embodiment of the present invention.

FIG. 4 is a schematic front view of a stencil printing machine used in the first embodiment of the present invention.

FIG. 5 is a schematic front view showing a state in which a printing unit is connected to the stencil printing apparatus according to the first embodiment of the present invention.

FIG. 6 is a schematic front view of a printing unit that employs a second embodiment of the present invention.

7 (a) is a front view, FIG. 7 (b) is a side view, and FIG. 7 (c) is a rear view illustrating a plate cylinder used in a second embodiment of the present invention.

FIG. 8 is a schematic front view of the printing unit when the plate cylinder is removed from the printing unit according to the second embodiment of the present invention.

FIG. 9 is a schematic view of the transfer drum cleaning means used in the second embodiment of the present invention when it is not in operation.

FIG. 10 is a schematic view illustrating a plate cylinder driving means used in the second embodiment of the present invention.

FIG. 11 is a schematic view illustrating an upside-down moving means used in the second embodiment of the present invention.

FIG. 12 is a schematic front view of a stencil printing machine used in a second embodiment of the present invention.

FIG. 13 is a schematic front view of the stencil printing machine used in the second embodiment of the present invention when the plate cylinder is removed.

FIG. 14 is a schematic front view showing a state in which a printing unit is connected to the stencil printing machine according to the second embodiment of the present invention.

FIG. 15 is a schematic view of the transfer cylinder cleaning means used in the modification of the second embodiment of the present invention during operation.

FIG. 16 is a schematic view of a transfer drum cleaning unit used in a modification of the second embodiment of the present invention when it is not in operation.

[Explanation of symbols]

1,118 Printing unit 2 Plate making section 3,119 Plate cylinder 4,121 Pressing means (press roller) 5,122 Paper conveying means 6,123 Paper discharging section 7 Plate discharging section 16,73 Master 25,175 Cleaning means (cleaning roller) 32, 172 Registration roller pair 33 Registration cleaning means (cleaning roller) 50, 188 Stencil printer 95 Paper ejection tray 120 Transfer cylinder 126 Unit body 152 Displacement means (top and bottom moving means) 177 Resist cleaning means (sheet roller)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B41L 13/16 B41L 13/16 B

Claims (8)

[Claims] 1. A printing unit which is connected to a stencil printing device to perform double-sided printing, comprising a plate cylinder around which a master is wound, a plate making section for making a plate for the master, and a surface discharged from the stencil printing device. Paper conveying means for receiving and conveying the printed single-sided printed sheet, pressing means for pressing the other surface of the single-side printed sheet conveyed by the paper conveying means to the outer peripheral surface of the plate cylinder, and the pressing means. A discharge unit for discharging the double-sided printed paper, which has been pressed on the plate cylinder by the means to transfer images on both sides, to the outside of the machine, and a discharge unit for separating the used master from the plate cylinder and discarding it. A printing unit comprising: 2. A printing unit which is connected to a stencil printing device to perform double-sided printing, and which is detachable from the stencil printing device and the main unit of the unit and around which a master is wound, and the plate cylinder. Printing is performed on a transfer cylinder that has substantially the same diameter and is driven to rotate in synchronism with the plate cylinder, and is in contact with the plate cylinder to transfer an image on the outer peripheral surface thereof, and one surface discharged from the stencil printing machine. A sheet conveying unit that receives and conveys the one-side printed sheet that has been made, and a pressing unit that presses the other surface of the one-side printed sheet that is conveyed by the sheet conveying unit to the outer peripheral surface of the transfer cylinder.
2. A printing unit, comprising: a paper ejecting unit for ejecting a double-sided printed paper, which has been pressed on the transfer cylinder by the pressing unit and has images transferred on both sides, to the outside of the machine. 3. A displacement means for displacing a relative position between the plate cylinder and the transfer cylinder, wherein the displacement means operates when the plate cylinder is attached to or detached from the unit main body. The printing unit described. 4. The printing unit according to claim 1, further comprising a cleaning unit that cleans a surface of the pressing unit in the vicinity of the pressing unit. 5. The printing unit according to claim 4, wherein the pressing means is arranged above the plate cylinder. 6. The peripheral speed of rotation of the plate cylinder and the paper transport speed of the paper transport means are the same as the moving speed of the one-side printed paper discharged from the stencil printing machine. The printing unit according to any one of claims 1 to 5. 7. The stencil printing machine has a paper discharge tray on which the single-sided printed paper can be stacked in a removable manner, and the paper discharge section is configured to be removable from the paper discharge tray. The printing unit according to any one of claims 1 to 6. 8. A registration roller pair for temporarily holding the one-side printed sheet conveyed by the sheet conveying means and then feeding it at a predetermined timing, and cleaning the surface in the vicinity of the registration roller pair. The printing unit according to any one of claims 1 to 7, further comprising a resist cleaning unit.