JP2001030609A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single-faced printing stencil printer and a perfect printing stencil printer for preventing the generation of noises and the distortion to a plate cylinder when the printing is carried out and also provide a perfect printing stencil printer for simply and stably setting the printing pressure. SOLUTION: A stencil printer 1 is provided with a plate cylinder 27 with a master supporting plate, a press means 28 provided to be brought into contact with and released from the outer peripheral face of the plate cylinder 27, an ink feed means 34 with an ink roller 35 feeding an ink on the inner peripheral face of the plate cylinder 27 and a clamper 33 provided on a flat section formed on the outer peripheral face of the plate cylinder 27, and the ink roller 35 is set movably by an outer face cam along the inner peripheral face of the plate cylinder 27, and an elastic member for moving the outer peripheral face of the plate cylinder 27 in its radius direction is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly to a structure of a plate cylinder and an ink supply unit for supplying ink to the inner peripheral surface of the plate cylinder.

[0002]

2. Description of the Related Art Conventionally, digital thermosensitive stencil printing is known as a simple printing method. This is achieved by bringing a thermal head, in which fine heating elements are arranged in a line, into contact with a heat-sensitive stencil master (hereinafter referred to as "master") and conveying the master while energizing the heating elements in a pulsed manner. The master is heated and melt-punched, and after the master is wound around the outer peripheral surface of the porous cylindrical plate cylinder, the outer peripheral surface of the plate cylinder is pressed by a pressing means such as a press roller via printing paper, Ink is transmitted through the perforated portion and transferred to printing paper to obtain a printed image.

In stencil printing, in recent years, double-sided printing for printing on both sides of a printing paper has become the majority of printing in order to reduce consumption of the printing paper. This double-sided printing involves passing the printing paper loaded in the paper feed unit through the printing unit, printing on one side, turning the printing paper over, passing it through the printing unit again, and printing on the other side to print on both sides. However, there is a problem in that it is troublesome to set the printing paper once discharged in the paper feeding unit again, or to arrange the printing paper after single-sided printing.

[0004] In addition, since the printed material after printing is not sufficiently dried with ink, if printing is immediately performed on the back surface, a conveying roller or a press roller is pressed against the image area, and the printed image is stained or disturbed. In most cases, print on the back after several hours or more,
In particular, when there is a solid image portion, it is necessary to dry for a long time, and printing on the back surface has been performed the next day.

As described above, in duplex printing, it is necessary to wait for a long time before printing on the back side, and moreover, the paper passing to the printing section must be performed for 2 hours.
Since the printing is performed twice, the printing time is twice as long as the single-sided printing, and there is a problem that it takes too much time.

In order to solve this problem, a first plate cylinder, a second plate cylinder disposed opposite to the first plate cylinder via a sheet conveying path, and an outer peripheral surface of the first plate cylinder are provided. Contacting / separating means for bringing the outer peripheral surface of the second plate cylinder into and out of contact with each other;
Japanese Patent Laid-Open No. 6-71 discloses a stencil printing apparatus for obtaining a double-sided printed matter in a process.
No. 996 and JP-A-6-135111.

A first plate cylinder, a first pressing means disposed opposite to the first plate cylinder via a sheet conveying path and provided so as to be able to press against and separate from the first plate cylinder; A second plate cylinder disposed on the downstream side of the first plate cylinder in the sheet conveying direction and opposite to the first plate cylinder via the sheet conveying path, and a second plate cylinder via the sheet conveying path; A second pressing means provided opposite to the cylinder and provided so as to be able to press and separate from the second plate cylinder, and after pressing the first plate cylinder and the first pressing means, Japanese Patent Laid-Open No. 8-8989 discloses a stencil printing apparatus for obtaining a double-sided printed matter in one step by pressing a second printing cylinder against a second pressing means.
No. 3 and JP-A-8-142577.

A first plate cylinder having a flexible first master support plate and a first plate cylinder having a flexible second master support plate via a paper transport path are provided. A second plate cylinder disposed opposite to the cylinder and disposed in proximity to the first plate cylinder;
Having a first ink roller provided inside the plate cylinder of the first master support plate so as to be capable of being pressed against and separated from the first master support plate.
And a second ink supply means provided inside the second plate cylinder.
A second ink supply means having a second ink roller disposed opposite to the first ink roller, the second ink supply means being provided on the master support plate so as to be able to be pressed and separated, and a first ink roller for moving the first ink roller. Ink roller moving means;
A second ink roller moving means for moving the ink rollers of the first and second ink rollers. Each ink roller is moved by operating each of the ink roller moving means. Japanese Patent Application Laid-Open No. H10-114136 discloses a stencil printing apparatus which obtains a double-sided printed matter in one process by passing a printing paper through the printing paper.

[0009]

In the stencil printing apparatus for single-sided printing described above, a clamper for locking the master is provided on the outer peripheral surface of the plate cylinder, and the pressing means is used to avoid interference with the clamper. Is arranged at a position separated from the outer peripheral surface of the plate cylinder by a certain distance. Accordingly, when the pressing means presses the outer peripheral surface of the plate cylinder, the moving distance of the pressing means is large to some extent. There was a point.

In order to solve the above problems, a flat portion is formed on the outer peripheral surface of the plate cylinder, a clamper is provided in the flat portion, and an ink roller disposed inside the plate cylinder to avoid the flat portion is provided. Japanese Patent Laid-Open No. 9-1235 discloses a movable structure.
No. 81 discloses this. According to this configuration, the distance between the outer peripheral surface of the plate cylinder and the pressing means can be reduced because the clamper is located on the inner side of the outer peripheral surface of the outer peripheral surface when the plate cylinder is rotated. Can be suppressed.

However, according to the technology disclosed in the above publication,
If the pressing force against the outer peripheral surface of the plate cylinder by the pressing means is too small, the printing pressure becomes insufficient, and the amount of ink transferred from the inside of the plate cylinder to the printing paper through the perforated portion is reduced, thereby causing poor printing. It is necessary to set the pressing force of the pressing means to the outer peripheral surface of the cylinder to a certain degree or more, and it is not possible to prevent distortion of the plate cylinder.

A plate cylinder of a conventional stencil printing machine has a cylindrical porous master support plate fixed to the outer peripheral surfaces of a pair of flanges disposed near both ends of a spindle. A predetermined amount of ink is supplied to the inner peripheral surface of the plate cylinder by disposing the ink roller at a position separated by a predetermined distance from the internal master support plate, and the outer peripheral surface of the plate cylinder is pressed by pressing means. When the master support plate is compressed,
The ink present in the gap between the master support plate and the ink roller oozes out of the perforated portion and is transferred to the printing paper. There is a problem in that the vicinity of the portion is deformed by compression, but the vicinity of both ends is not deformed, and the amount of ink transferred to the printing paper becomes non-uniform.

Further, the stencil printing apparatus capable of one-step double-side printing has the same problems as the stencil printing apparatus for single-sided printing, and is disclosed in JP-A-6-71996, JP-A-6-135111, and The stencil printing apparatuses disclosed in Japanese Unexamined Patent Publication No. Hei 8-90893 and Japanese Unexamined Patent Publication No. Hei 8-142577 have problems such as noise and distortion of the plate cylinder.

In a stencil printing apparatus disclosed in Japanese Patent Application Laid-Open No. H10-114136, which can perform one-step double-sided printing, as shown in FIG. The master support plate of the cylinder is bulged, and a printing pressure is generated between the plate cylinders to transfer ink to printing paper. However, since both of the ink rollers provided in each plate cylinder are moved by the inner cam, the cam follower provided on the ink roller is separated from the inner cam when the printing pressure is generated. Is dependent on the urging force of the urging means for pressing the cam follower against the inner cam, and there is a problem that the printing pressure setting is difficult and unstable.

According to the present invention, a stencil printing apparatus for single-sided printing and a stencil printing apparatus for double-sided printing capable of preventing generation of noise and distortion of a plate cylinder during printing, and furthermore, simple and stable setting of printing pressure. It is an object of the present invention to provide a stencil printing apparatus for double-sided printing that can be carried out by performing the above steps.

[0016]

According to the first aspect of the present invention,
A plate cylinder having a porous master support plate, pressing means provided so as to be able to be pressed against and separated from the outer peripheral surface of the plate cylinder, and ink on the inner peripheral surface of the plate cylinder disposed inside the plate cylinder. An ink supply unit having an ink roller for supplying a printing medium, and a clamper that locks a master disposed on a flat portion provided on an outer peripheral surface of the plate cylinder. In the stencil printing apparatus which performs printing by pressing against the outer peripheral surface of the plate cylinder, the ink roller is provided movably along the inner peripheral surface of the plate cylinder by an outer surface cam, and the outer peripheral surface of the plate cylinder is an elastic member. Characterized by being provided so as to be movable in the radial direction via a.

According to a second aspect of the present invention, there is provided a plate cylinder having a flexible porous master support plate, and a printing member disposed in the vicinity of an outer peripheral surface of the plate cylinder via a sheet conveying path. A stencil printing apparatus comprising: an ink supply unit having an ink roller disposed inside the plate cylinder and supplying ink to the inner peripheral surface of the plate cylinder. The printing is performed by pressing a printing sheet between the master support plate and the printing member, which are provided so as to be capable of being pressed and separated from each other and swelled by the pressing of the ink roller.

According to a third aspect of the present invention, a first plate cylinder having a flexible first porous master support plate and a flexible second porous master support plate are provided. A second plate cylinder disposed in close proximity to the first plate cylinder via a paper transport path, and provided inside the first plate cylinder so as to be able to be pressed against and separated from the first master support plate. A first ink supply unit having a first ink roller, and a first ink roller provided inside the second plate cylinder and opposed to a first ink roller which is provided on a second master support plate so as to be able to be pressed and separated therefrom. A second ink supply means having a second ink roller, a first ink roller moving means for moving the first ink roller, and a second ink roller moving means for moving the second ink roller. The printing paper between the plate cylinders, and It activates the Kirora movement means,
In a stencil printing apparatus that performs printing by swelling and pressing the outer peripheral surface of each of the plate cylinders, any one of the ink roller moving units may have an outer surface cam,
It is characterized in that either one has an inner cam.

According to a fourth aspect of the present invention, there is provided a first plate cylinder having a flexible first master support plate, and a first plate cylinder disposed close to the first plate cylinder via a sheet conveying path. A second plate cylinder having a porous second master support plate, and a first ink roller provided inside the first plate cylinder and capable of being pressed against and separated from the first master support plate. A first ink supply unit, a second ink supply unit that is provided inside the second plate cylinder and has a second ink roller that supplies ink to the inner peripheral surface of the second plate cylinder, And an ink roller moving means for moving the ink roller of the first printing cylinder. The printing paper is passed between the respective plate cylinders to operate the ink roller moving means, thereby expanding the outer peripheral surface of the first plate cylinder. A stencil printing apparatus that performs printing by pressing against an outer peripheral surface of a second plate cylinder, Serial ink roller moving means has an outer surface cam, the outer peripheral surface of the second plate cylinder, characterized in that it is movable in the radial direction via the elastic member.

According to a fifth aspect of the present invention, there is provided a first plate cylinder having a porous master support plate, and a porous master support plate disposed close to the first plate cylinder via a sheet conveying path. A second plate cylinder, contacting / separating means for pressing and separating the first plate cylinder and the second plate cylinder, and ink provided on the inner peripheral surface of the first plate cylinder provided inside the first plate cylinder. First ink supply means having an ink roller for supplying ink, and second ink supply means provided inside the second plate cylinder and having an ink roller for supplying ink to the inner peripheral surface of the second plate cylinder. A stencil printing apparatus that performs printing by passing the printing paper between the respective plate cylinders, operating the contacting / separating means, and pressing the outer peripheral surfaces of the respective plate cylinders respectively. Is provided so as to be movable in the radial direction via an elastic member. To.

According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fifth aspect, at least one of the plate cylinders further includes a flat portion on an outer peripheral surface and a clamper for locking a master. The ink roller provided on the plate cylinder having the flat portion and the clamper is provided so as to be movable along the inner peripheral surface of the plate cylinder by an outer surface cam.

According to a seventh aspect of the present invention, there is provided a first plate cylinder having a porous master support plate, which is disposed opposite to the first plate cylinder via a sheet conveying path and is pressed against the first plate cylinder. A first pressing means detachably provided, and a porous master provided on the downstream side of the first plate cylinder in the sheet conveying direction and facing the first plate cylinder via the sheet conveying path. Second with support plate
And a second cylinder, which is disposed opposite to the second cylinder via a paper transport path and is provided so as to be able to be pressed against and separated from the second cylinder.
Pressing means, first ink supply means provided inside the first plate cylinder and having an ink roller for supplying ink to the inner peripheral surface of the first plate cylinder, and provided inside the second plate cylinder And second ink supply means having an ink roller for supplying ink to the inner peripheral surface of the second plate cylinder, and the printing paper is pressed against the outer peripheral surface of the first plate cylinder by the first pressing means. rear,
In a stencil printing apparatus that performs printing by pressing a printing sheet against the outer peripheral surface of a second plate cylinder by a second pressing unit, the outer peripheral surface of each of the plate cylinders can be moved in its radial direction via an elastic member. It is characterized by being provided.

According to an eighth aspect of the present invention, in the stencil printing machine according to the seventh aspect, each of the plate cylinders further includes a flat portion on an outer peripheral surface and a clamper for locking a master, and each of the ink rollers is It is characterized by being provided movably along the inner peripheral surface of each plate cylinder by an outer cam.

According to a ninth aspect of the present invention, there is provided a stencil printing machine according to the first, fourth, fifth, sixth, seventh or eighth aspect, further comprising: A pair of flanges are attached at intervals in the axial direction, and both ends of the master support plate are supported by these flanges. The elasticity is provided between the outer peripheral surface of each flange and the inner peripheral surface of the master support plate. A member is provided.

According to a tenth aspect of the present invention, there is provided a stencil printing apparatus according to the first, fourth, fifth, sixth, seventh or eighth aspect, further comprising: A pair of flanges are attached at intervals in the axial direction,
Both ends of the master support plate are supported by these flanges, and the elastic member is disposed between each of the flanges and the support shaft.

According to an eleventh aspect of the present invention, in the stencil printing apparatus according to the first, second, third, fourth, sixth or eighth aspect, the outer surface cam is further provided with the plate cylinder. A portion for moving the ink roller in accordance with the rotation of the plate cylinder, and a portion for holding the ink roller at a fixed position separated from the inner peripheral surface of the plate cylinder regardless of the rotation of the plate cylinder. .

[0027]

FIG. 1 is a schematic front view of a stencil printing apparatus used in a first embodiment of the present invention. In FIG. 1, the stencil printing apparatus 1 mainly includes an image reading unit 2, a paper feeding unit 3, a plate making unit 4, a plate discharging unit 5, a paper discharging unit 6, a printing unit 7, and the like.

The image reading section 2 includes a movable reflecting mirror 8,
The paper supply unit 3 includes a lens 9, an image sensor 10, and the like. The paper supply unit 3 includes a paper supply tray 11 on which printing paper P is loaded and which can move up and down, a paper supply roller 12, a separation roller 13, and a pair of registration rollers 1.
4 and so on. The plate making unit 4 includes a master storage unit 16 that stores a master roll 15a formed by winding the master 15,
It has a platen roller 17, a thermal head 18, a cutting means 19, a pair of master transport rollers 20, 21, and the like. The plate discharge unit 5 is a plate discharge member 2 that peels a used master 15 from an outer peripheral surface of a plate cylinder 27 to be described later to pinch and convey.
2. It has a plate discharging box 23 for storing the used master 15 transported by the plate discharging member 22 and the like. The paper discharge unit 6 includes a separation claw 24 that separates the printed printing paper P from the outer peripheral surface of the plate cylinder 27, a paper discharge conveyance unit 25 that conveys the printing paper P out of the machine, and a paper discharge conveyance unit 25. And a discharge tray 26 on which the printed printing paper P is stacked.

The printing section 7 has a plate cylinder 27, a press roller 28 as a pressing means, and the like. As shown in FIGS. 2, 3, and 4, the plate cylinder 27 has a pair of flanges 30 having a flat portion rotatably supported by a spindle 29 also serving as an ink supply pipe, and an outer peripheral surface of each flange 30. , A master support plate 32 disposed on the outer peripheral surface of each elastic member 31, an ink supply means 34, and the like. A low-hardness rubber material is used as the elastic member 31, and the master support plate 32 having an opening corresponding to the print image area has a non-opening in a portion corresponding to the flat portion of the flange 30 and in the vicinity thereof. are doing.

On the outer peripheral surface of the plate cylinder 27 and on the plane portion of the master support plate 32, a clamper 33 for locking the tip of the master 15 is provided. The clamper 33, which is rotatably supported by the clamper shaft 33a and is opened and closed by opening and closing means (not shown), is located inside the outer peripheral surface locus of the plate cylinder 27 (indicated by a dashed line in FIG. 3) when closed. Is provided.

An ink supply means 34 is provided inside the plate cylinder 27. The ink supply means 34 mainly includes a support shaft 29, an ink roller 35, a doctor roller 36, and the like. Ink roller 35 that supplies ink to the inner peripheral surface of plate cylinder 27, that is, the inner peripheral surface of master support plate 32.
Both ends are rotatably supported by a pair of ink roller side plates 37, and are driven to rotate in the same direction as the plate cylinder 27 by transmitting a driving force from a driving unit (not shown). Each ink roller side plate 37 that supports the ink roller 35 at a substantially central portion thereof has one end swingably supported at the other end of a pair of arm members 38 having one end fixed to the support shaft 29. Between each ink roller side plate 37, there is provided a doctor roller 36 which receives a driving force from a driving means (not shown) and is driven to rotate in a direction opposite to the ink roller 35. The doctor roller 36 has an outer peripheral surface. The ink roller 35 is disposed at a position separated from the outer peripheral surface by a predetermined distance. The ink supplied from the support shaft 29 is stored in the vicinity of the ink roller 35 and the doctor roller 36, and the wedge-shaped ink pool 3 is stored.
9 is formed. The ink in the ink pool 39 is supplied to the outer peripheral surface of the ink roller 35 in a thin film form when passing through the vicinity of the ink roller 35 and the doctor roller 36. A cam follower 40 is rotatably attached to the other end of each ink roller side plate 37.

A cam plate 41, which is an external cam, is fixed to an end surface of the inner surface of each of the flanges 30 on the plate cylinder. The cam plate 41 rotatably provided integrally with the flange 30 has a convex portion and a concave portion. When the cam follower 40 comes into contact with the convex portion, as shown in FIG.
When the cam follower 40 comes into contact with the recess at a position where the outer peripheral surface of the master support plate 32 comes close to the inner peripheral surface of the master support plate 32, the outer peripheral surface of the ink roller 35 is brought into contact with the master support plate 32 as shown in FIG. In order to position each ink roller side plate 37 at a position close to the inner surface of the flat portion, the outer peripheral surface shape is set so that the ink roller 35 is swung in accordance with the inner peripheral surface shape of the plate cylinder 27. Each ink roller side plate 37 is constantly provided with an urging force for bringing the cam follower 40 into contact with the outer peripheral surface of the cam plate 41 by urging means (not shown). The gap between the outer peripheral surface of the ink roller 35 and the inner peripheral surface of the master support plate 32 is 0.3 to
It is set to be about 1.0 mm.

A press roller 28 is provided below the plate cylinder 27. The press roller 28 is rotatably supported between a pair of press roller arms 42 that are swingably supported by side plates (not shown) of the stencil printing machine 1. The press roller arm 42 is moved by a swinging means (not shown) so that the outer peripheral surface of the press roller 28 is separated from the outer peripheral surface of the master support plate 32, as shown in FIG. It is selectively swung to the pressure contact position shown in FIG. The pressing force of the press roller 28 against the master support plate 32 is set to an appropriate value by a biasing unit (not shown). A flat portion is formed on the plate cylinder 27, and the clamper 3
3 is disposed inside the locus of the outer peripheral surface of the plate cylinder 27 in the plane portion, and the ink roller 35 is swingably provided in synchronization with the rotation of the plate cylinder 27. The swing distance of the press roller 28 to the position,
The distance can be set to a value that can provide the minimum printing pressure enough to obtain an appropriate image, and the pressing noise of the plate cylinder 27 by the press roller 28 generated during printing can be suppressed.

Below the press roller 28, a plate cylinder driving means 43 is provided. The plate cylinder driving means 43 includes a stepping motor 44 which can be rotated forward and backward, a toothed pulley 4
5, 46, an endless belt 47 and the like.
The toothed pulley 45 is attached to the output shaft of the stepping motor 44, and the toothed pulley 46 is fixed to an end surface of the flange 30 on the front side of the apparatus on the outer side of the plate cylinder, and an endless belt is provided between the toothed pulleys 45 and 46. 47 are passed over. The plate cylinder 27 is rotationally driven by transmitting a rotational driving force from a stepping motor 44.

The operation of the stencil printing machine 1 based on the above configuration will be described below. When a document is set on the image reading section 2 and an operator presses a plate making start key (not shown), the reflection mirror 8 moves to read a document image. The read document image data is stored in a storage unit (not shown) of the stencil printing apparatus 1.

In parallel with the reading operation, a plate discharging operation of the used master 15 from the plate cylinder 27 is performed. When the plate making start key is pressed, the plate cylinder driving means 43 operates, and the plate cylinder 27 is pressed.
Are rotated counterclockwise in FIG. And plate cylinder 2
When the rear end of the master 15 on the sheet 7 reaches the plate discharging position corresponding to the plate discharging member 22, the operation of the plate cylinder driving means 43 is stopped, and the opening / closing means (not shown) is operated, and the clamper 33 is opened. You. After releasing the clamper 33,
The upper plate discharging member 22 moves to the plate cylinder 27 side, and its peripheral surface comes into contact with the master 15 on the plate cylinder 27 and starts rotating. When the plate discharging member 22 starts rotating, the plate cylinder driving means 4
3, the plate cylinder 27 is driven to rotate counterclockwise in FIG. As a result, the used master 15 wound on the outer peripheral surface of the plate cylinder 27 is nipped and conveyed by the plate discharging member 22 and stored in the plate discharging box 23.

After the plate discharging operation is completed, the opening / closing means (not shown) is operated to close the clamper 33.
3, the plate cylinder 27 is driven to rotate counterclockwise in FIG. Then, when the clamper 33 reaches the plate feeding position, which is the position shown in FIG.
The clamper 33 is released.

After the release of the clamper 33, the plate making operation is started. The platen roller 17 and the master transport roller pairs 20 and 21 simultaneously start rotating, and the master roll 15a
Then, the master 15 is pulled out. Master 1 pulled out
5 is subjected to hot-melt perforation plate making based on image data when passing through the thermal head 18 to form a plate making image. The master 15 on which the plate-making image is formed is conveyed to the clamper 33 by the pair of master conveying rollers 20 and 21 while being guided by the master guide plate. When it is determined from the number of steps of a stepping motor (not shown) that drives the platen roller 17 that the leading end of the master 15 has reached a predetermined position between the clamper 33 and the master support plate 32, the opening / closing means (not shown) operates. The clamper 33 is closed. After clamping the leading end of the master 15 with the clamper 33, the plate cylinder driving means 43 is operated, and the plate cylinder 27 starts rotating clockwise at a peripheral speed substantially equal to the master transport speed.

From the number of steps of a stepping motor (not shown) for driving the platen roller 17,
When it is determined that the plate making has been completed, the rotation of the platen roller 17 and the master transport roller pairs 20 and 21 is stopped, and the cutting unit 19 cuts the master 15. The cut master 15 is pulled out by the rotation of the plate cylinder 27, and the winding operation is completed.

Following the winding operation, a plate attaching operation is performed. After the completion of the winding operation, the paper feed roller 12 and the separation roller 13 operate, and one print sheet P is separated and fed from the paper feed tray 11. After the fed printing paper P is gripped by the pair of registration rollers 14, the plate cylinder 27 and the press roller 2 that are rotating at a low speed at a predetermined timing.
8 is fed. Printed paper P fed
Is pressed by the press roller 28 against the master 15 wound around the plate cylinder 27, and the image is transferred onto the upper surface thereof.
The printing paper P on which the image has been transferred is peeled off from the outer peripheral surface of the plate cylinder 27 by the peeling claw 24, and is conveyed by the paper discharging and conveying means 25, then discharged onto the paper discharge tray 26, and the plate attaching operation is completed. When the printing start key (not shown) is pressed after the completion of the printing operation, the printing paper P is continuously fed from the paper feeding unit 3, and the printing cylinder 27 is rotated at a high speed to perform the printing operation.

At the time of press-contact between the plate cylinder 27 and the press roller 28 at the time of the above-described printing operation and printing operation, a predetermined printing pressure is applied to the plate cylinder 27 by the press roller 28. When the pressure is absorbed by the elastic member 31 and deformed, the outer peripheral surface of the ink roller 35 and the inner peripheral surface of the master support plate 32 come into contact with each other without causing distortion in the plate cylinder 27, and the printing paper P is inked. Is transferred. At this time, the deformation of the elastic member 31 suppresses the deformation of the master support plate 32 itself.
And the master support plate 32 contact linearly,
The amount of ink transferred to the printing paper P is made uniform.

As a modification of the first embodiment, as shown in FIG. 5, a configuration using a pair of arm members 48 and a pair of cam plates 49 instead of the arm members 38 and the cam plates 41 may be employed. . Each arm member 48 differs from the arm member 38 only in that it has an extension portion 48a at one end thereof, and the other end supports the ink roller side plate 37 at the other end so as to be swingable. A cam plate 49 having a convex portion and a concave portion is rotatably supported by the extending portion 48a, and the cam plate 49 is rotationally driven in synchronization with the plate cylinder 27 by driving means (not shown). Like the cam plate 41, the shape of the cam plate 49 is set so that the ink roller 35 swings in accordance with the inner peripheral surface shape of the plate cylinder 27. In this configuration, the same effect as in the first embodiment can be obtained.

In the first embodiment and the modification, the press roller 28 is used as the pressing means. Alternatively, an impression cylinder provided to be able to freely contact and separate from the plate cylinder 27 may be used.

FIGS. 6 and 7 show a printing unit 50 used in the second embodiment of the present invention. The printing unit 50 includes a plate cylinder 51 and a printing roller 52 as a printing member instead of the plate cylinder 27 and the press roller 28 as compared with the printing unit 7.
Is different from the first embodiment.

The plate cylinder 51 includes a pair of flanges 53 having notches rotatably supported by the support shaft 29, and an elastic master support plate 5 disposed on the outer peripheral surface of each flange 53.
4 mainly. The master support plate 54 having an opening corresponding to the image area has a non-opening in a portion corresponding to the notch of the flange 53 and in the vicinity thereof,
Both ends of the flange 53 are engaged with a stage 55 provided in a notch of the flange 53. Master support plate 54 and stage 5
5 is disclosed in Japanese Patent Application Laid-Open No. H10-114136.
The master support plate 54 has a structure similar to that of the engagement between the porous support plate 83 and the stage portion 86 disclosed in US Pat. The peripheral surface of the flange 53 can be easily protruded from the peripheral surface of the flange 53. On the stage 55, a thin clamper 56 for holding the tip of the master 15 is provided.
The clamper 56 is opened and closed by opening and closing means (not shown).

Inside the plate cylinder 51, an ink supply means 57 and an ink roller moving means 58 are provided. The ink supply means 57 mainly includes a support shaft 29, an ink roller 35, a doctor roller 36, and the like. It is mainly composed of

The pair of fixed side plates 59 are fixed to the support shaft 29 by fixing members (not shown), and the other ends are integrally connected by a connecting plate 59a. A pair of swing side plates 60 are provided outside each fixed side plate 59. Each swinging side plate 60 has a shaft 62
Each of the fixed side plates 59 is swingably supported at one end thereof, and the other ends thereof are integrally connected by a connecting plate 60a. An ink roller 35 is rotatably supported below the center between the swinging side plates 60, and a doctor roller 36 is rotatably supported near the upper portion thereof. A tension spring 63 is stretched between the other end of each fixed side plate 59 and each swinging side plate 60, and a pair of cam followers 64 are rotatably arranged outside each swinging side plate 60. I have.

In addition to the ink supply means 57 and the ink roller driving means 58, the plate cylinder 51 is provided with a driving force transmitting mechanism 65 for transmitting the rotational driving force from the plate cylinder driving means 43. The driving force transmission mechanism 65 mainly includes the toothed pulley 46, a pair of gears 66, a pair of transmission gears 67, and the like. A gear 66 is provided on the inner side end surface of the flange 53 on the plate cylinder.
Are respectively fixed. As shown in FIG. 8, each gear 66 is fixed to each flange 53 by a spline shaft-shaped fixing member 68, and transmission gears 67 are provided at both ends of the support shaft 62 protruding from each swing side plate 60. 66
Are fixed to each other in such a manner as to be engaged with the second member. With this configuration, the rotational driving force from the stepping motor 44 is
Toothed pulley 45, endless belt 47, toothed pulley 4
6, one gear 66, one transmission gear 67, the support shaft 62,
The transmission is transmitted to each flange 53 via the other transmission gear 67 and the other gear 66, and the plate cylinder 51 is driven to rotate.

FIG. 9 (a) shows the outer peripheral portion of each fixing member 68.
As shown in FIG. 7, a pair of outer cams 61 which are fitted on the splines of the fixing member 68 and are slidable on the fixing member 68 are provided. Outer cam 61 that can contact cam follower 64
Is formed integrally with a notched disc-shaped first cam portion 61a having a recess in a part of the outer periphery, and a disc-shaped second cam portion 61b having an outer periphery formed to have the same diameter as the recess of the first cam portion 61a. Have. The shape of the first cam portion 61a is such that when the cam follower 64 contacts the convex portion, the outer peripheral surface of the ink roller 35 is pressed against the master support plate 54 as shown by a solid line in FIG. When the cam follower 64 comes into contact with the concave portion at the position where the fixed amount of bulging is performed, the outer peripheral surface of the ink roller 35 is separated from the master supporting plate 54, and the master supporting plate 54 is expanded as shown by a two-dot chain line in FIG. The outer peripheral surface shape is set so as to swing the ink roller 35 in order to position each swing side plate 60 at the position where the protrusion is released. The gap between the outer peripheral surface of the ink roller 35 and the inner peripheral surface of the master support plate 54 is 0.3 mm.
１．０1.0 mm, and the amount of swelling of the master support plate 54 when the outer peripheral surface and the inner peripheral surface of the master support plate 54 are pressed against each other.
The disposition position and the swelling amount are set so as to be larger than the thickness of No. 6 (about 3 to 5 mm).

As shown in FIG. 9B, each second cam portion 61b has a switching means for selectively switching the outer cam 61 abutting on the cam follower 64 between the first cam portion 61a and the second cam portion 61b. 69 are attached. Switching means 6
Reference numeral 9 denotes a first end having one end fixed to one second cam portion 61b.
It mainly includes an arm 69a, a second arm 69b having one end fixed to the other second cam portion 61b, a pinion gear 69c, and the like. First arm 69a and second arm 69
A rack is formed at the other end of b, and each rack is meshed with the pinion gear 69c. The pinion gear 69c is attached to an output shaft of a motor (not shown) that can rotate forward and reverse.

A printing roller 52 is provided below the plate cylinder 51. The printing roller 52 rotatably supported by a casing side plate (not shown) is configured such that when the cam follower 64 abuts against the concave portion of the first cam portion 61a and the second cam portion 61b, the outer peripheral surface of the master supporting plate 54 and its outer periphery The clamper 56 can pass through the gap between the master support plate 54 and the outer surface of the master support plate 54 that swells when the cam follower 64 comes into contact with the projection of the first cam portion 61a. The master support plate 54 is provided at a position where it is possible to apply a minimum printing pressure for obtaining an appropriate image.

The operation of the second embodiment based on the above configuration will be described below. A document is set on the image reading unit 2,
When the operator presses a plate making start key (not shown), an image reading operation, a plate discharging operation, a plate making operation, and a winding operation are performed as in the first embodiment. During this series of operations, each outer cam 61 is positioned at a position where the second cam portion 61b comes into contact with each cam follower 64,
The ink roller 35 is held at a position where its outer peripheral surface is separated from the inner peripheral surface of the master support plate 54.

After the winding operation is completed, one sheet of printing paper P is separated and fed from the paper feeding unit 3, and the plate cylinder 51 is driven to rotate at a low speed. At the start of rotation of the plate cylinder 51, a motor (not shown) is driven to rotate the pinion gear 69 c by a predetermined amount, and each of the outer cams 6 abutting on each of the cam followers 64.
1 is switched from the second cam portion 61b to the first cam portion 61a. The printing paper P timed by the registration roller pair 14 is fed between the printing cylinder 52 and the printing roller 52 rotating at a low speed. The fed printing paper P is swelled by the ink roller 35 moved radially outward of the plate cylinder 51 by the contact between the convex portion of the first cam portion 61a and the cam follower 64. The image of the master 15, which is pressed by the print roller 52 by the printing roller 52 and wound on the plate cylinder 51, is transferred onto the upper surface thereof. The printing paper P on which the image has been transferred is peeled off from the outer peripheral surface of the plate cylinder 51 by the peeling claw 24, and is conveyed by the paper discharging and conveying means 25 and then discharged onto the paper discharge tray 26, thereby completing the printing operation. When the printing start key (not shown) is pressed after the completion of the printing operation, the printing paper P is continuously fed from the paper feeding unit 3, and the printing drum 51 is rotated at a high speed to perform the printing operation.

At the time of press-contact between the plate cylinder 51 and the printing roller 52 during the above-mentioned printing operation and printing operation, a predetermined printing pressure is applied to the printing roller 52 from the printing cylinder 51. Since the swelling of the master support plate 54 for application is performed by the outer surface cam 61, the swelling amount of the master support plate 54 can be always kept at a constant value, and the printing pressure can be stabilized. Further, since the transfer of the ink to the printing paper P is performed by the swelling of the master supporting plate 54, the ink roller 35 and the master supporting plate 54 come into linear contact with each other, and the ink transfer amount to the printing paper P becomes uniform. Is done.

As a modification of the second embodiment, the switching means 6
Instead of 9, switching means 70 shown in FIG. 10 and switching means 71 shown in FIG. 11 may be used. The switching means 70 mainly includes a first arm 70a, a second arm 70b, a rotating arm 70c, and a solenoid 70d. First arm 7
One end of Oa is fixed to one second cam portion 61b, and the other end is provided with a projection 70e. One end of the second arm 70b is also fixed to the other second cam portion 61b, and the other end is provided with a projection 70f. A substantially L-shaped rotating arm 70c is rotatably supported at its center by a pin 70g implanted inside the plate cylinder.
Elongated holes into which the projections 70e and 70f fit are formed at both ends. A plunger of a solenoid 70d fixed inside the plate cylinder is attached to the bent portion of the rotating arm 70c. With this configuration, when the operation state and the non-operation state of the solenoid 70d are switched, the rotation arm 70c rotates around the pin 70g, and the cam follower 6
4 is selectively switched between the first cam portion 61a and the second cam portion 62b.

The switching means 71 includes a first arm 71a and a second arm 71a.
It mainly includes an arm 71b, a rotating arm 71c, a transmission gear 71d, and a pinion gear 71e. One end of the first arm 71a is fixed to one second cam portion 61b, and the other end is provided with a projection 71f. One end of the second arm 71b is also fixed to the other second cam portion 61b, and the other end is provided with a projection 71g. The pivot arm 71c is fixed at its center to a support shaft 71h rotatably supported inside the plate cylinder. Elongated holes are formed at both ends of the pivot arm 71c, into which the projections 71f and 71g fit. . A transmission gear 71d is fixed to the tip of the support shaft 71h,
The transmission gear 71d meshes with a pinion gear 71e attached to an output shaft of a motor (not shown) that can rotate forward and reverse. With this configuration, when a motor (not shown) operates, the rotation arm 71c rotates around the support shaft 71h,
The outer cam 61 abutting on the cam follower 64 is selectively switched between a first cam portion 61a and a second cam portion 62b.

In the second embodiment and the modified example, the printing roller 72 is used as a printing member. However, the printing member is substantially the same diameter as the plate cylinder 51 and rotates in synchronization with the plate cylinder 51. A printing cylinder may be used. The printing member is
When the master support plate 54 swells from the plate cylinder 51 side,
If a required printing pressure can be obtained, the master support plate 54 may be configured to be retractable by a predetermined amount in the bulging direction.

FIG. 12 is a schematic front view of a stencil printer capable of performing one-step double-sided printing employing the third embodiment of the present invention. Referring to FIG.
Image reading unit 73, sheet feeding unit 74, first plate making unit 75, second plate making unit 76, first plate discharging unit 77, second plate discharging unit 78, sheet discharging unit 7
9, a printing unit 80, and a control unit 81.

An image reading section 73 is provided above the housing 82 of the stencil printing apparatus 72. The image reading unit 73 includes a contact glass 83, a pair of original transport rollers 84 and an original transport roller 85, guide plates 86 and 87, an original transport belt 88, a switching plate 89, reflection mirrors 90 and 91 and fluorescent lamps 92, a lens 93, and a CCD. It mainly comprises an image sensor 94 and the like.

A paper feed unit 74 is provided in the middle of the right side of the housing 82. The paper feed unit 74 mainly includes a paper feed tray 95 on which the printing paper P is stacked, a paper feed roller 96, separation rollers 97 and 98, a pair of registration rollers 99, and the like.

A first plate making section 75 is provided above the sheet feeding section 74. The first plate making section 75 includes a master storage section 101 that supports a master roll 100a formed by winding the master 100 into a roll, a thermal head 102, a platen roller 103, cutting means 104, a pair of master transport rollers 105 and 106, and the like. It is mainly composed.

A second plate-making section 76 is provided in the middle of the left side of the housing 82. Similarly to the first plate making unit 75, the second plate making unit 76 includes a master storage unit 108 for supporting a master roll 107a formed by winding a master 107 in a roll shape, a thermal head 109, a platen roller 110, a cutting unit 1
11, mainly composed of master transport roller pairs 112, 113 and the like.

Above the second plate making section 76, a first plate discharging section 77 is provided.
Are arranged. The first plate discharging section 77 includes a driving roller,
An upper plate discharging member 114 and a lower plate discharging member 115 composed of a driven roller and an endless belt, a plate discharging box 116, a compression plate 11
7 and so on. As for the upper plate discharging member 114 and the lower plate discharging member 115, the endless belt moves in the direction of the arrow in FIG. Also, the lower plate discharging member 11
Reference numeral 5 is movably provided by a moving means (not shown), and is selectively positioned at a position shown in the figure and a position at which the endless belt on the driving roller side comes into contact with an outer peripheral surface of a plate cylinder 126 described later. The plate discharge box 116 is provided detachably with respect to the housing 82, and the compression plate 117 is vertically movably supported by a lifting means (not shown).

At the lower right of the second plate making section 76, a second plate discharging section 7 is provided.
8 are provided. The second plate discharging section 78 includes the first plate discharging section 7.
As in the case of 7, it mainly includes an upper plate discharging member 118, a lower plate discharging member 119, a plate discharging box 120, a compression plate 121, and the like. The upper plate discharging member 118 and the lower plate discharging member 119 are each composed of a driving roller, a driven roller, and an endless belt, similarly to the upper plate discharging member 114 and the lower plate discharging member 115. Each endless belt is rotated by the rotation of each driving roller. Move in the direction of the arrow. Further, the lower plate discharging member 119 is provided so as to be movable by a moving means (not shown), and is selectively positioned at a position shown in the figure and a position at which the endless belt on the drive roller side comes into contact with an outer peripheral surface of a plate cylinder 127 described later. Is done. The plate discharge box 120 is detachable from the housing 82, and the compression plate 121 is moved up and down by a lifting means (not shown).

A paper discharge section 79 is provided between the second plate making section 76 and the first plate discharge section 77. The paper discharge unit 79 includes separation claws 122 and 123, a paper discharge conveyance member 124, and the paper discharge tray 12
5 mainly. The peeling claw 122 is rotatably supported by a side plate (not shown) of the housing 82, and its tip is provided to be able to advance and retreat with respect to the outer peripheral surface of the plate cylinder 126. The peeling claw 123 is also rotatably supported by a side plate (not shown) of the housing 82, and the tip thereof is provided to be able to advance and retreat with respect to the outer peripheral surface of the plate cylinder 127. The paper discharging and conveying member 124 composed of a driving roller, a driven roller, an endless belt, a suction fan and the like sucks the printing paper P onto the endless belt by the suction force of the suction fan, and plots the printing paper P by the rotation of the driving roller. Transport in the direction of the arrow.
The paper discharge tray 125 has a pair of side fences and end fences that are movable in the width direction of the printing paper P, and is configured to be housed inside the housing 82 by folding.

A printing section 80 is provided at the center of the housing 82. The printing unit 80 includes a plate cylinder 12 serving as a first plate cylinder.
6. Plate cylinder 127 as second plate cylinder, plate cylinder driving means 12
8 and so on.

The plate cylinder 126 has a support shaft 129 at the center which also serves as an ink supply pipe, and a first shaft 129 on its outer peripheral surface.
A master support plate 130, which is a master support plate, and an ink supply unit 13 serving as a first ink supply unit therein.
1 and an ink roller moving means 135 as a first ink roller moving means.

The plate cylinder 126 is the same as the plate cylinder 5 shown in the second embodiment.
1, and has a pair of rotatable flanges near both ends of the support shaft 129, and a master support plate 130 is mounted around the flange so as to protrude. A flat portion is formed on each flange, and a thin clamper 132 is attached to the flat portion so as to be openable and closable. A pair of gears (not shown) is attached to each flange, and the plate cylinder 126 is rotationally driven by transmitting rotational driving force from the plate cylinder driving means 128 via the gears.

The ink supply means 13 is provided inside the plate cylinder 126.
1 is provided. The ink supply means 131 mainly includes a support shaft 129, an ink roller 133 as a first ink roller, a doctor roller 134, and the like, like the ink supply means 57. The ink roller moving means 135 includes an ink roller Like the moving means 58,
It mainly comprises a pair of fixed side plates 136, a pair of swing side plates 137, a pair of outer cams 138, and the like. Support shaft 12
9, ink roller 133, doctor roller 134
Has the same configuration as the support shaft 29, the ink roller 35, and the doctor roller 36, and a description thereof will be omitted.

The pair of fixed side plates 136 have their center portions substantially fixed to the support shaft 129, respectively, and the other end portions are integrally connected. A pair of swinging side plates 1 is provided outside each fixed side plate 136.
One end of each of the swinging side plates 137 is swingably supported on one end of a fixed side plate 136 by a support shaft 139, and the other end of each of the swinging side plates 137 is integrally connected. An ink roller 133 and a doctor roller 134 are rotatably supported between the swinging side plates 137 in opposite directions to each other, and a cam follower 139 is rotatable on the outer side surface of the plate cylinder of each swinging side plate 137. Attached to.

A first cam portion 138 configured in the same manner as in the second embodiment is provided on the inner end surface of each of the flanges (not shown).
a and a pair of outer cams 13 having a second cam portion 138b.
8 is provided so as to be movable in the plate cylinder axis direction. Each of the outer cams 138 may be connected to the cam follower 139 by a switching means (not shown) similar to the switching means 69 shown in the second embodiment.
8b. Further, a plate cylinder driving means 128 is provided on an end surface of the one side of the plate cylinder outside (not shown).
A toothed pulley (not shown) for transmitting the driving force from the motor is provided. Plate cylinder driving means 128 transmitted to one flange (not shown) via an endless belt (not shown)
Is transmitted to the other flange by a pair of transmission gears (not shown) and a support shaft (not shown) provided in the same manner as in the second embodiment.

Below the plate cylinder 126, a plate cylinder 127 is provided. The plate cylinder 127 is rotatably supported by a support shaft 140 also serving as an ink supply pipe, and is a second master support plate on its outer peripheral surface, similarly to the plate cylinder 80 disclosed in JP-A-10-114136. The master support plate 141 has therein an ink supply unit 142 as a second ink supply unit and an ink roller moving unit 144 as a second ink roller movement unit. The plate cylinder 127 is disposed at a position where the outer peripheral surface of the master support plate 141 is separated from the outer peripheral surface of the master support plate 130 by a predetermined distance (about 5 to 7 mm).

The plate cylinder 127 has a pair of rotatable flanges near both ends of the support shaft 140, and a master support plate 141 is mounted around the flange so as to be swellable. A flat portion is formed on each of the flanges, and a thin clamper 143 is attached to the flat portion so as to be openable and closable. A pair of gears (not shown) is attached to each flange, and the plate cylinder 127 is rotationally driven by transmitting rotational driving force from the plate cylinder driving means 128 via the gears. The inner peripheral surface of each flange is described in
An inner cam (not shown) similar to that disclosed in FIG. 8 of Japanese Patent No. 14136 is formed.

The ink supply means 14 is provided inside the plate cylinder 127.
2 and an ink roller moving means 144 are provided. The ink supply means 142 mainly includes a support shaft 140, an ink roller 145 serving as a second ink roller, a doctor roller 146, and the like. The ink roller moving means 144 is disclosed in JP-A-10-114136. And a pair of ink roller support members 148, a pair of inner cams (not shown), a solenoid and a stopper (not shown), and the like. The support shaft 140, the ink roller 145, and the doctor roller 146 have the same configuration as the support shaft 29, the ink roller 35, and the doctor roller 36, and a description thereof will not be repeated.

The base 147 is fixed to the support shaft 140 by a mounting member (not shown). An ink roller 145 and a doctor roller 14 are provided outside the base 147.
A pair of ink roller supporting members 148 for rotatably supporting the ink jet printer 6 are pivotally attached at substantially center portions thereof by a support shaft 149, and each of the ink roller supporting members 148 is integrally connected at one end thereof. Have been.
Between the base 147 and each of the ink roller supporting members 148, a pair of tension springs 153 whose ends are fixed to the base 147 and the ink roller supporting member 148, respectively, are stretched. A biasing force in the clockwise direction in FIG. 12 is applied to the ink roller support member 148 about the support shaft 149 by the biasing force.

At both ends of the support shaft for supporting the ink roller 145, cam followers (not shown) that are in contact with inner cams of flanges (not shown) are provided. When each cam follower comes into contact with the convex portion of each inner cam by the urging force of the tension spring 153, the ink roller 145 separates its outer peripheral surface from the inner peripheral surface of the master support plate 141, and each cam follower separates each inner cam. Of the master support plate 141, the outer peripheral surface thereof protrudes from the outer peripheral surface of each flange.
Is configured to bulge out.

A stopper (not shown), which engages with a part of each ink roller support member 148 and regulates the swing thereof, with the outer peripheral surface of the ink roller 145 being separated from the inner peripheral surface of the master support plate 141, is provided with a base 147. Is rotatably supported by a bracket (not shown) attached to the
A solenoid (not shown) attached to the base 147 is selectively moved to a holding position where it engages with each ink roller support member 148 and a non-holding position where it does not engage with each ink roller support member 148.

At the lower right of the plate cylinder 127, the plate cylinder driving means 12
8 are provided. The plate cylinder driving means 128 is mainly composed of two motors (not shown) which are rotatable in the normal and reverse directions and are driven to rotate in mutually opposite directions. I have. A timing belt (not shown) is stretched between one of the motors and the plate cylinder 126 and between the other motor and the plate cylinder 127.
The motors 6 and 127 are rotationally driven in the opposite directions in synchronization with each other by receiving the rotational force from each motor.

A control section 81 is provided below the inside of the housing 82. The control unit 81 mainly includes a control unit 152, which is a known microcomputer having a CPU, a ROM, a RAM, and the like, and controls the operation of the stencil printing apparatus 72.

The operation of the third embodiment will be described below based on the above configuration. Prior to the printing operation, the operator selects either a double-sided printing mode for performing double-sided printing or a single-sided printing mode for performing single-sided printing. In the present embodiment, a case where the duplex printing mode is selected will be described.

When two originals are set on an original receiving table (not shown), and a plate-making start key (not shown) is pressed by an operator, the plate cylinder driving means 128 operates to operate the plate cylinder 1.
26 rotates in the counterclockwise direction in FIG. 12, and the used master 150 wound on the outer peripheral surface of the plate cylinder 126 is peeled off by the upper plate discharging member 114 and the lower plate discharging member 115,
The used master 150 is compressed by the compression plate 117 after being stored in the plate discharge box 116. Plate cylinder 126
When the plate cylinder 127 starts rotating clockwise in FIG. 12 simultaneously with the rotation of the plate cylinder 127, the used master 151 wound on the outer peripheral surface of the plate cylinder 127 is displaced by the upper plate discharging member 118 and the lower plate discharging member 119. It is peeled off from the outer peripheral surface of the body 127, conveyed into the plate discharge box 120, and compressed by the compression plate 121. Thereafter, the plate cylinders 126 and 127 rotate to the plate feeding standby position and stop, and the plate discharging operation is completed.

The image reading section 73 performs an operation of reading a document image. In parallel with the plate discharging operation, the original conveying roller pair 84
Starts rotating, and the upper one of the originals (not shown) is conveyed over the contact glass 83. The reading of the original image is performed by reflecting the reflected light exposed and reflected by the fluorescent lamp 92 by the reflection mirrors 90 and 91, and the read original image is condensed by the lens 93 and then enters the image sensor 94. The electrical signal that has been subjected to the photoelectric conversion is input to an A / D converter (not shown) in the housing 82. The document from which the image has been read is discharged by a document transport belt 88 and a document transport roller 85 to a document tray (not shown) disposed above the document transport belt 88.

In parallel with the original reading operation, the first plate making section 75
Then, a plate making operation is performed. After the plate discharging operation is completed, the platen roller 103 and the master transport roller pairs 105 and 106 start rotating, and the master 100 is pulled out from the master roll 100a. Master 100 withdrawn
Is made when passing through the thermal head 102.
A plurality of heating elements arranged and arranged on the surface of the thermal head 102 are selectively provided in accordance with digital image signals sent after various processes are performed on an A / D converter and other plate making boards (not shown). Heat is generated, and the thermoplastic resin film of the master 100 is heated and melt-punched.

When the control means 152 determines that the leading end of the master 100 has reached a predetermined position based on the number of steps of a stepping motor (not shown) that rotationally drives the platen roller 103, an operation signal is sent to the opening / closing means (not shown). The clamper 132 is closed and the master 10
0 is pinched.

Thereafter, the plate cylinder 126 rotates clockwise in FIG. 12 at the same peripheral speed as the transport speed of the master 100, and the operation of winding the master 100 around the plate cylinder 126 is performed. When the control unit 152 determines that plate making for one plate is completed based on the number of steps of a stepping motor (not shown), the rotation of the platen roller 103 and the master transport roller pair 105 and 106 is stopped, and the cutting unit 1 is stopped.
04 operates and the master 100 is disconnected. The cut master 100 is pulled out by the rotation operation of the plate cylinder 126. When the plate cylinder 126 reaches the home position again, the plate cylinder driving unit 128 is stopped by a command from the control unit 152, and the plate cylinder 126 is positioned. .

After the positioning of the plate cylinder 126, the original conveying roller pair 84 starts to rotate again, and the remaining original is conveyed on the contact glass 83 and read as described above. The read document is discharged to a document tray (not shown). In this embodiment, the image is read from each of the two originals. However, when reading the image from both sides of one original, the original transport belt 88 and the original transport roller 85 rotate after the reading of one side is completed. Switching plate 89 at the same time
Are rotated counterclockwise by a mechanism (not shown), so that the traveling direction of the document is changed and guided again onto the contact glass 83, and the other surface is read.

In parallel with the original reading operation, the second plate making section 76
In the case, the plate making operation is performed similarly to the first plate making section 75. After the plate discharging operation is completed, the platen roller 110 and the master transport roller pairs 112 and 113 respectively start rotating, and the master 107 is pulled out from the master roll 107a. The drawn-out master 107 is subjected to plate making when passing through the thermal head 109 as described above.

When the control means 152 determines that the leading end of the master 107 has reached a predetermined position based on the number of steps of a stepping motor (not shown) that rotationally drives the platen roller 110, an operation signal is sent to opening / closing means (not shown). The clamper 143 is closed and the master 10
7 are pinched.

Thereafter, the plate cylinder 127 rotates counterclockwise in FIG. 12 at the same peripheral speed as the transport speed of the master 107,
The operation of winding the master 107 around the plate cylinder 127 is performed. When the control unit 152 determines that plate making for one plate has been completed based on the number of steps of a stepping motor (not shown), the rotation of the platen roller 110 and the master transport roller pairs 112 and 113 is stopped, and the cutting unit 11 is stopped.
1 operates and the master 107 is disconnected. The cut master 107 is pulled out by the rotation operation of the plate cylinder 127. When the plate cylinder 127 reaches the home position again, the plate cylinder driving unit 128 is stopped by a command from the control unit 152, and the plate cylinder 127 is positioned. .

In the above-described plate discharging operation and plate feeding operation, each outer surface cam 138 is positioned at a position where the second cam portion 138b comes into contact with each cam follower 139.
The outer peripheral surface of the ink roller 133 is
It is held at a position separated from the inner peripheral surface of the zero. A stopper (not shown) provided inside the plate cylinder 127 is also positioned at a holding position by a solenoid (not shown). Have been.

At the same time as the plate feeding operation to each of the plate cylinders 126 and 127 is completed, the sheet feeding roller 96 and the separation rollers 97 and 98 rotate, and the plate cylinder driving means 128 starts operating. 1 at the top of the loaded printing paper P
The sheets are separated and fed toward the registration roller pair 99, and the plate cylinders 126 and 127 start rotating at a low speed. At the start of rotation of each of the plate cylinders 126 and 127, switching means (not shown) is operated to rotate the pinion gear 69c by a predetermined amount, and each of the outer cams 138 abutting on each of the cam followers 139.
Is switched from the second cam portion 138b to the first cam portion 138a. At the same time, a solenoid (not shown) in the plate cylinder 127 is operated, and a stopper (not shown) is positioned at the non-holding position.

As the plate cylinders 126 and 127 rotate, the ink rollers 133 are moved in the plate cylinder 126 by the first cam portions 138.
a, the ink roller 1 in the plate cylinder 127
45 starts a swinging operation along the shape of the inner cam (not shown). These ink rollers 133, 145
The printing paper P is fed from the pair of registration rollers 99 toward the space between the plate cylinders 126 and 127 with a slight delay from the swinging operation. Thereby, the master support plate 130, the master 100,
The ink roller 133 and the ink roller 145 are pressed against each other via the master 107, the master support plate 141, and the printing paper P, and a print image is transferred to both sides of the printing paper P. The printing paper P on which the image has been transferred is placed on each of the release claws 122 and 123
Is separated from the outer peripheral surfaces of the plate cylinders 126 and 127 by
After being conveyed by the paper discharge conveying means 124, it is discharged onto the paper discharge tray 125, and the plate attaching operation is completed. When the printing start key (not shown) is pressed after the completion of the printing operation, the printing paper P is continuously fed from the paper feeding unit 74, and the printing drums 126 and 127 are driven to rotate at a high speed to perform the printing operation. Is

When the plate cylinders 126 and 127 are pressed against each other during the above-described printing operation and printing operation, each of the plate cylinders 12 and 127 is pressed.
6 and 127, the printing paper P
A predetermined printing pressure is applied from 6,127. At this time, the swelling of each of the master support plates 130 and 141 for applying the printing pressure is caused by the inner surface cam (not shown) and a pair of tension members (not shown) on the plate cylinder 127 side, similar to the one disclosed in JP-A-10-114136. This is performed by the spring 153, but is performed by the outer surface cam 138 on the plate cylinder 126 side.
The swelling amount of the master support plate 130 on the side becomes constant,
The printing pressure can be stabilized. Also, the master support plate 1
Since the swelling of the plate 41 is performed by an inner cam (not shown) and the tension spring 153, the printing pressure can be adjusted by adjusting the spring force of the tension spring 153.
The interval between 6,127 can also be set roughly.

When performing one-sided printing using the stencil printing apparatus 72 shown in the above embodiment, the master 100 made on the plate cylinder 126 is replaced with the master 10 made on the plate cylinder 127.
7 may be wound and the printing operation may be performed in the same manner as in duplex printing. In the above embodiment, the plate cylinder 126 having the outer surface cam is used.
Is arranged above the paper transport path, and the plate cylinder 127 having the inner surface cam is arranged below the paper transport path. Alternatively, the plate cylinders may be arranged reversely.

FIG. 13 shows a printing section of a stencil printing apparatus capable of performing one-step double-sided printing used in the fourth embodiment of the present invention. In the fourth embodiment, a stencil printing apparatus similar to the stencil printing apparatus 72 shown in the third embodiment is used as the stencil printing apparatus, and only the printing section is different.

In FIG. 13, the printing unit 154 includes a plate cylinder 155 as a first plate cylinder and a plate cylinder 156 as a second plate cylinder.
It is mainly composed of Here, the plate cylinder 155 is different from the plate cylinder 51 shown in the second embodiment in that a stage 157 having a flat portion is used instead of the stage 55, and a detailed description thereof will be omitted.

Below the plate cylinder 155, a plate cylinder 156 is provided. As shown in FIG. 14, the plate cylinder 156 has a pair of flanges 159 having a stage 163 rotatably supported by a support shaft 158 also serving as an ink supply pipe, and an annular ring disposed on the outer peripheral surface of each flange 159. Elastic member 16
0, a master support plate 161 as a second master support plate disposed on the outer peripheral surface of each elastic member 160, and ink supply means 162 and the like. The plate cylinder 156 is
The gap between the master support plate 161 and the master support plate 54 is 1 to
The elastic member 16 is disposed so as to be about 3 mm.
As 0, the same as the elastic member 31 shown in the first embodiment is used.

On the stage 163, a clamper 164 for locking the tip of the master 107 is provided. The clamper 164 is a thin clamper that can pass between the master support plates 54 and 161 and is opened and closed by opening and closing means (not shown) when the plate cylinder 156 reaches a predetermined position. Further, a toothed pulley 168 is attached to an end surface of the one flange 159 on the outer side of the plate cylinder, and the toothed pulley 168 is connected to the plate cylinder driving means 128 via an endless belt (not shown).

[0099] The ink supply means 162 mainly includes a support shaft 158, an ink roller 165, a doctor roller 166, and the like. An ink roller 165 for supplying ink to the inner peripheral surface of the master support plate 161 is rotatably supported at both ends by a pair of ink roller side plates 167, and is driven by a driving force from a driving unit (not shown).
6 is driven to rotate in the same direction. Each ink roller side plate 167 supporting the ink roller 165 at the upper part is
The lower part is fixed to the support shaft 158. Each ink roller side plate 167 has a gap t between the outer peripheral surface of the ink roller 165 and the inner peripheral surface of the master support plate 161 of 0.3 to 1.0 mm.
It is arranged so that it becomes.

A doctor roller 166 is provided near each ink roller side plate 167 in the vicinity of the position where the ink roller 165 is provided. I have. The doctor roller 166 is disposed at a position where the outer peripheral surface of the doctor roller 166 is separated from the outer peripheral surface of the ink roller 165 by a predetermined distance. The ink supplied via the ink supply pipe which is not used is stored, and a wedge-shaped ink pool is formed.

The operation of the fourth embodiment will be described below based on the above configuration. In the fourth embodiment, a case where the double-sided printing mode is selected will be described. When two originals are set on a document receiving tray (not shown) and an operator presses a plate making start key (not shown), an image reading operation, a plate discharging operation, a plate making operation, and a winding operation are performed in the same manner as in the third embodiment. Is During this series of operations, each outer cam 61 is positioned at a position where the second cam portion 61b comes into contact with each cam follower 64, and the ink roller 35 separates its outer peripheral surface from the inner peripheral surface of the master support plate 54. It is held in the position where it was set.

After the completion of the winding operation, one sheet of printing paper P is separated and fed from the paper feeding unit 74, and the plate cylinders 155, 15
6 is driven to rotate at low speed. At the start of rotation of each of the plate cylinders 155 and 156, the switching means 69 is operated and each outer cam 61 abutting on each cam follower 64 is moved to the second cam portion 61b.
Is switched to the first cam portion 61a. The printing paper P timed by the pair of registration rollers 99 is fed between the plate cylinders 155 and 156 rotating at a low speed. The fed printing paper P is pressed against the outer peripheral surface of the plate cylinder 156 by the master support plate 54 bulged by the contact between the convex portion of the first cam portion 61a and the cam follower 64.
At the time of this pressing, the gap t between the ink roller 165 and the master support plate 161 is compressed, and the image is transferred to both sides of the printing paper P. The printing paper P on which the image has been transferred is peeled off from the outer peripheral surfaces of the plate cylinders 155 and 156 by the peeling claws 122 and 123, and is conveyed by the paper discharge conveying means 124 and then discharged onto the paper discharge tray 125. The attaching operation is completed. When the printing start key (not shown) is pressed after the printing operation is completed, the printing paper P is continuously fed from the paper feeding unit 74, and the printing drums 155 and 156 are rotated at high speed to perform the printing operation. Will be

When the plate cylinders 155 and 156 are pressed against each other during the above-described plate-attaching operation and printing operation, a predetermined printing pressure is applied from the plate cylinder 155 to the plate cylinder 156 by the swelled master support plate 54. When the printing pressure is absorbed by the elastic member 160 and deformed, the outer peripheral surface of the ink roller 165 and the inner peripheral surface of the master support plate 161 come into contact with each other without causing distortion in the plate cylinder 156. And printing paper P
Is transferred to the ink. At this time, since the deformation of the elastic member 160 suppresses the deformation of the master support plate 161 itself, the ink roller 165 and the master support plate 161 come into linear contact with each other, so that the ink transfer amount to the printing paper P is uniform. Be transformed into Further, since the swelling of the master support plate 54 is performed by the outer surface cam 61, the swelling amount of the master support plate 54 becomes constant, and the printing pressure can be stabilized.

FIG. 15 shows a printing section of a stencil printing apparatus capable of performing one-step double-sided printing used in the fifth embodiment of the present invention. In the fifth embodiment, a stencil printing apparatus similar to the stencil printing apparatus 72 shown in the third embodiment is used as the stencil printing apparatus, and only the printing section is different. In FIG. 15, a printing unit 169 includes a plate cylinder 170 as a first plate cylinder, a plate cylinder 171 as a second plate cylinder, and each plate cylinder 1.
It mainly comprises a contacting / separating means 172 for pressing and separating the 69 and 170.

A plate cylinder 170 constructed in the same manner as the plate cylinder 156
As shown in FIG. 16, a pair of flanges 175 having a stage 174 rotatably supported by a spindle 173 also serving as an ink supply pipe, and an annular elastic member provided on the outer peripheral surface of each flange 175 176 and each elastic member 17
6 mainly includes a master support plate 177 as a first master support plate, an ink supply unit 178 as a first ink supply unit, and the like. Spindle 1
73 is swingably supported by the contact / separation means 172 described later,
As the elastic member 176, the same as the elastic members 31 and 160 is used. On the stage 174, a thin clamper 179 which is opened / closed by opening / closing means (not shown) is provided, and a rotation driving force from the printing drum driving means 128 is provided on one end surface of the flange 175 outside the printing drum. Is mounted.

The ink supply means 178 mainly includes a support shaft 173, an ink roller 181 as a first ink roller, a doctor roller 182, and the like. Ink roller 181 rotatably supported at both ends by a pair of ink roller side plates 183 fixed to support shaft 173
Is rotationally driven in the same direction as the plate cylinder 170 by a driving unit (not shown). The ink roller 181 is arranged so that the gap between the outer peripheral surface and the master support plate 177 is 0.3 to 1.0 mm. Ink roller side plate 183
A doctor roller 182 is rotatably supported at both ends thereof at a position near the position where the ink roller 181 is provided.
Is driven to rotate in the opposite direction to the ink roller 181 by driving means (not shown).

A plate cylinder 171 disposed below the plate cylinder 170
Similarly to the plate cylinder 170, a pair of flanges 186 having a stage 185 rotatably supported by a spindle 184 also serving as an ink supply pipe, and an annular elastic member disposed on the outer peripheral surface of each flange 186 187 and each elastic member 18
7 mainly includes a master support plate 188 serving as a second master support plate and an ink supply means 189 serving as a second ink supply means. As the elastic member 187, the same member as the elastic members 31, 160, and 176 is used. A thin clamper 190 is disposed on the stage 185. A toothed pulley 191 for transmitting the rotational driving force from the driving means 128 is attached.

The ink supply means 189 mainly comprises a spindle 184, an ink roller 192 as a second ink roller, a doctor roller 193, and the like. The ink roller 192 and the doctor roller 193 are fixed to the spindle 184. Both ends are rotatably supported by a pair of ink roller side plates 194 thus formed. The ink roller 192 is driven by a driving unit (not shown).
1, and the doctor roller 193 is driven to rotate in the opposite direction to the ink roller 192 by driving means (not shown). The gap between the outer peripheral surface of the ink roller 192 and the master support plate 188 is 0.3 to 1.
It is arranged to be 0 mm.

The contact / separation means 172 includes a pair of swing arms 19.
5. It mainly comprises a pair of swing cams 196, stoppers 197, tension springs 198 and the like. The center portion is made of a plate material that is gently bent.
The other end of each of the swing arms 195 that support the swing arm 3 is integrally connected by a support shaft 199.
9 is rotatably supported by the housing 82. A cam follower 200 is provided at a portion near one end of each swing arm 195.
Are rotatably mounted outward. An engaging portion 195a for engaging with the stopper 197 is formed at one end of one swing arm 195, and the other end of a tension spring 198 having one end fixed to the housing 82 is formed near the engaging portion 195a. It is fixed. As a result, a rotational urging force in the counterclockwise direction in FIG. 15 is applied to each swing arm 195 about the support shaft 199.

Below the one end of the swing arm 195, a pair of swing cams 196 that are in contact with the respective cam followers 200 are arranged. The swing cam 196, which is an elliptical eccentric cam having a long diameter portion and a short diameter portion, is integrally fixed to a support shaft 201 rotatably supported by the housing 82, and is driven by driving means (not shown). Each plate cylinder 170, 171
It is driven to rotate in synchronism with. The swing cam 196 is positioned at a position where the clampers 179 and 190 can pass through the gap between the master support plate 177 and the master support plate 188 when the long diameter portion and the cam follower 200 abut on each other. The cylinder 170 is separated from the plate cylinder 171, and the master support plates 177 and 188 are formed in such a shape that the master support plates 177 and 188 come into contact with each other before the short diameter portion and the cam follower 200 come into contact with each other.
The contact pressure between the master supporting plates 177 and 188 is a pressure at which the ink from the plate cylinders 170 and 171 is satisfactorily transferred to the printing paper while the printing paper is passed between the master supporting plates 177 and 188. The spring force of the tension spring 198 is set such that

In the vicinity of one end of the swing arm 195, there is provided a stopper 197 for holding the plate cylinder 170 separated from the plate cylinder 171. The stopper 197 mainly includes a solenoid 202 and a locking arm 203. One end of the locking arm 203 rotatably supported by a pin 203 a implanted in the housing 82 is provided on a plunger 202 a of the solenoid 202. Is attached. The other end of a tension spring 204 having one end fixed to the housing 82 is fixed to the locking arm 203 having a bent portion 203b engageable with the engaging portion 195a at the other end. A rotational biasing force is applied to the pin 203 in the counterclockwise direction in FIG. 15 around the pin 203a.

The operation of the fifth embodiment will be described below based on the above configuration. The case where the double-sided printing mode is selected will be described also in the fifth embodiment. When two originals are set on a document receiving tray (not shown) and an operator presses a plate making start key (not shown), an image reading operation, a plate discharging operation, a plate making operation, and a winding operation are performed in the same manner as in the third embodiment. Is During this series of operations, the engagement portion 19
5a and the bent portion 203b are engaged, and the plate cylinder 170 is held with each master support plate 177 separated from the master support plate 188.

After the winding operation is completed, one sheet of printing paper P is separated and fed from the paper feeding unit 74, and the plate cylinders 170, 17
1 is rotationally driven at a low speed. When the plate cylinders 170 and 171 start rotating, the solenoid 202 operates to suck the plunger 202a, and the locking arm 203
15 is rotated clockwise around FIG.
The engagement between the engaging portion 195a and the bent portion 203b is released. The swing arm 19 in which the engagement of the engagement portion 195a is released.
5 is rotated counterclockwise in FIG. 15 around the support shaft 199 by the urging force of the tension spring 198. At the start of the rotation, each plate cylinder 170, 171
The rocking cam 196 is placed at a position where its long diameter portion faces the cam follower 200. This allows the swing arm 19
5 causes each cam follower 200 to abut on the long diameter portion of each swing cam 196 when the plate cylinders 170 and 171 start rotating.

The printing paper P timed by the pair of registration rollers 99 is applied to each plate cylinder 17 rotating at a low speed.
It is fed between 0,171. The fed printing paper P is attached with a tension spring 198 as shown in FIG. 17 by separating the long diameter portion of the swing cam 196 rotating in synchronization with the plate cylinders 170 and 171 from the cam follower 200. The plate cylinder 170 is swung downward by the force to press the master support plate 177 against the master support plate 188.
71 is pressed against the outer peripheral surface. The printing paper P to which the ink has been transferred by the pressure contact of the plate cylinders 170 and 171 is separated from the outer peripheral surfaces of the plate cylinders 170 and 171 by the separation claws 122 and 123, and is discharged after being conveyed by the discharge conveyance means 124. The sheet is discharged onto the paper tray 125, and the printing operation is completed. When the printing start key (not shown) is pressed after the printing operation is completed, the printing paper P is continuously fed from the paper feeding unit 74, and the printing drums 170 and 171 and the swing cam 196 are driven to rotate at high speed. The printing operation is performed.

When the plate cylinders 170 and 171 are pressed against each other during the above-described plate-attaching operation and printing operation, a predetermined printing pressure is applied by the urging force of the tension spring 198. As the plates 176 and 187 absorb and deform, the outer peripheral surfaces of the ink rollers 181 and 192 come into contact with the inner peripheral surfaces of the master support plates 177 and 188 without causing distortion in the plate cylinders 170 and 171. Then, the ink is transferred to the printing paper P. At this time, each elastic member 17
6,187, the respective master support plates 177,188
Since the deformation of itself is suppressed, each ink roller 18
1 and 192 and the master support plates 177 and 188 are in linear contact with each other, so that the amount of ink transferred to the printing paper P is made uniform.

As a modification of the fifth embodiment, at least one of the plate cylinders 170 and 171 is replaced by a first cylinder.
Similarly to the plate cylinder 27 shown in the first embodiment, a plate cylinder having a pair of flanges having a flat portion and a master support plate, and an ink roller swingable according to the inner peripheral surface shape of the master support plate is provided. It may be configured to be used. Thus, the interval between the plate cylinders at the time of separation can be narrowed, so that the swing distance of one of the plate cylinders can be shortened, and the noise when the plate cylinders are pressed against each other can be reduced.

FIG. 18 is a schematic front view of a stencil printer capable of performing one-step double-sided printing employing the sixth embodiment of the present invention. Referring to FIG.
Are the image reading unit 206, the paper feeding unit 207, the first plate making unit 20
8, a second plate making section 209, a first plate discharging section 210, a second plate discharging section 211, a sheet discharging section 212, and a printing section 213.

The contact glass 215 and the original conveying roller pair 21 are provided on the upper part of the housing 214 of the stencil printing apparatus 205.
6 and original transport rollers 217, guide plates 218 and 21
9, an image reading unit 206 including a document conveying belt 220, a switching plate 221, reflection mirrors 222 and 223, a fluorescent lamp 224, a lens 225, an image sensor 226, and the like. In the middle section on the right side of the housing 214, a paper feed tray 227 for loading the print paper P, a paper feed roller 228, a separation roller pair 2
29, paper feed unit 20 having registration roller pair 230 and the like
7 are provided.

Above the paper feed unit 207, a master storage unit 232 supporting a master roll 231a formed by winding the master 231 in a roll shape, a thermal head 233, a platen roller 234, a cutting unit 235, and a pair of master transport rollers A first plate making section 208 having 236 and the like is provided. Below the first plate making section 208, a master storage section 238 for supporting a master roll 237a formed by winding the master 237 into a roll, a thermal head 239, a platen roller 240, cutting means 241, a pair of master transport rollers 242, etc. Is provided.

An upper plate discharging member 2 comprising a driving roller, a driven roller, and an endless belt is provided on the upper left side of the housing 214.
A first plate discharging section 210 having a plate discharging member 43, a lower plate discharging member 244, a plate discharging box 245, a compression plate 246, and the like is provided. Below the sheet feeding unit 207, a second plate discharging unit 211 having an upper plate discharging member 247, a lower plate discharging member 248, a plate discharging box 249, a compression plate 250, and the like similar to the first plate discharging unit 210 is provided. The upper left of the second plate making section 209 and the first
Below the plate discharging section 210, a sheet discharging and conveying member 252 composed of a peeling claw 251 provided to be able to contact and separate from an outer peripheral surface of a plate cylinder 256 to be described later, a driving roller and a driven roller, an endless belt, a suction fan, and the like, A paper discharge unit 212 having a paper discharge tray 253 and the like is provided.

A printing unit 213 is provided at substantially the center of the housing 214.
Are arranged. The printing unit 213 includes a plate cylinder 254 as a first plate cylinder, a press roller 255 as a first pressing unit, a plate cylinder 256 as a second plate cylinder, a press roller 257 as a second pressing unit, an intermediate Conveying means 258
It is mainly composed of

The plate cylinder 254 includes a first shaft including a support shaft 259, a pair of flanges (not shown), a master support plate 260 provided on the outer peripheral surface of each flange, an ink roller 261 serving as a first ink roller, and a doctor roller 262. Has an ink supply means 263 as an ink supply means,
It has the same configuration as the plate cylinder 171 shown in the fifth embodiment, and has the same not-shown elastic member 187 shown in the fifth embodiment as between the outer peripheral surface of the flange (not shown) and the master support plate. An elastic member and a clamper 264 that can be opened and closed are provided on the master support plate 260. Plate cylinder 254
Near the printing cylinder P and facing the plate cylinder 254 via the sheet transport path of the printing paper P, the swinging means (not shown) allows the outer peripheral surface of the printing paper P to freely contact and separate from the outer peripheral surface of the plate cylinder 254. The provided rotatable press roller 255 is provided.

Similarly to the plate cylinder 254, the support shaft 265,
Ink supply means 26 as a second ink supply means including a pair of flanges (not shown), a master support plate 266 provided on the outer peripheral surface of each flange, an ink roller 267 serving as a second ink roller, and a doctor roller 268.
A plate cylinder 256 having 9 and the like is provided. Plate cylinder 256
Has an elastic member (not shown) similar to the elastic member 187 between the outer peripheral surface of the flange (not shown) and the master support plate,
An openable / closable clamper 270 is provided on the master support plate 266. In the vicinity of the lower side of the plate cylinder 256 and the printing paper P
At a position facing the plate cylinder 256 via the paper transport path of
A rotatable press roller 257 provided so that its outer peripheral surface can be freely moved toward and away from the outer peripheral surface of the plate cylinder 256 by a swinging means (not shown).

The plate cylinder 254 is located between the plate cylinders 254 and 256.
Peeling claw 271 provided to be able to freely contact and separate from the outer peripheral surface of
Intermediate transport member 272 and intermediate transport member 2 including a driving roller, a driven roller, an endless belt, a suction fan, and the like.
An intermediate conveyance unit 258 having a registration roller 273 and the like arranged in pressure contact with the 72 drive rollers is provided.

The operation of the sixth embodiment will be described below based on the above configuration. The case where the double-sided printing mode is selected will be described also in the sixth embodiment. When two originals are set on an original receiving tray (not shown) and an operator presses a plate making start key (not shown), the plate cylinder 254 is pressed.
Is rotated clockwise in FIG. 18, the used master wound on the plate cylinder 254 is separated by the upper plate discharging member 247 and the lower plate discharging member 248, and the used master is stored in the plate discharging box 249. Later, it is compressed by the compression plate 250. At the same time as the rotation of the plate cylinder 254, the plate cylinder 256 also starts to rotate counterclockwise in FIG. 18, and the used master wound on the plate cylinder 256 is peeled off by the upper plate discharging member 243 and the lower plate discharging member 244. The peeled used master is stored in the plate discharge box 245 and then compressed by the compression plate 246. Thereafter, the plate cylinder 254 is rotated to a position where the clamper 264 shown in FIG. 18 is located immediately below, and the plate cylinder 256 is rotated to a position where the clamper 270 is located right beside the right side, and the plate discharging operation is completed.

In the image reading section 206, an operation of reading a document image is performed. Original feed roller pair 2 in parallel with plate discharge operation
16 starts rotating, and the upper one of the originals (not shown) is conveyed over the contact glass 215. Each reflection mirror 2
The original image is read by the fluorescent lamps 22 and 223 and the fluorescent lamp 224, and the read image is input to an A / D converter (not shown) in the housing 214 via the lens 225 and the image sensor 226. The document whose image has been read is discharged to a document tray (not shown) by the document conveying belt 220 and the document conveying roller 217. Thereafter, the second document image is read in the same manner, and the read image is input to an A / D converter (not shown) in the housing 214.

In parallel with the original reading operation, the first plate making section 20
8 and the second plate making section 209 perform a plate making operation. After the plate discharging operation is completed, the platen rollers 234 and 240 and the master transport roller pairs 236 and 242 start rotating, and the masters 231 and 237 are pulled out from the master rolls 231a and 237a. Each of the drawn masters 231 and 237 is subjected to plate making when passing through each of the thermal heads 233 and 239, and each of the masters 231 and 237 that have been plate formed.
37 is sent to each plate cylinder 254, 256. When it is determined from the number of steps of a stepping motor (not shown) that rotationally drives each of the platen rollers 234 and 240 that the leading ends of the respective masters 231 and 237 have reached a predetermined position, the opening / closing means (not shown) is activated to operate each clamper. The masters 231 and 237 are locked on the plate cylinders 254 and 256, respectively. Thereafter, the plate cylinder 254 is moved counterclockwise in FIG.
8 starts rotating at the same speed as the transport speed of the masters 231 and 237 in the clockwise direction. When plate making for one plate is completed, the cutting means 235 and 241 operate to operate the masters 231 and 231.
37 is cut. Disconnected masters 231, 237
Is pulled out by the rotation of the plate cylinders 254 and 256, and the plate feeding operation of the masters 231 and 237 to the plate cylinders 254 and 256 is completed. During the plate discharging operation and the plate feeding operation described above, the press rollers 255 and 257 are held at positions separated from the outer peripheral surfaces of the plate cylinders 254 and 256 by holding means (not shown).

At the same time when the plate feeding operation to the plate cylinders 254 and 256 is completed, the sheet feeding roller 228 and the separation roller pair 229 rotate, and the plate cylinders 254 and 256 rotate at low speed in the same direction as the plate feeding rotation direction. The rotation starts, and the uppermost printing paper P on the paper feeding tray 227 is separated and fed toward the registration roller pair 230. At this time, each press roller 255,
The holding means holding 257 is released, and the press rollers 255, 257 are rocked by the rocking means (not shown) in accordance with the rotation of the plate cylinders 254, 256.

The printing paper P sent out from the registration roller pair 230 at a predetermined timing is rotated by the press roller 255 which is swung in accordance with the image area of the master 237 wound on the plate cylinder 254. Pressed against the surface. Thereby, the master support plate 260 and the master 237
Then, the ink roller 261 and the press roller 255 are pressed against each other via the printing paper P, and the master 237 is attached to the printing paper P.
Is transferred. The printing paper P on which the image has been transferred is peeled off from the outer peripheral surface of the plate cylinder 254 by the peeling claw 271 and is sent to the intermediate conveyance member 272.

The printing paper P sent to the intermediate transport member 272 is suctioned on the unprinted surface on the endless belt by the suction fan, and the leading end is driven by the driving roller and the registration roller 273.
And is sandwiched between. When the registration roller 273 rotates at a predetermined timing, the printing paper P on which an image is formed on one side is sent to the plate cylinder 256, and the plate cylinder 25 is rotated.
6 is pressed against the outer peripheral surface of the plate cylinder 256 by a press roller 257 that is swung in accordance with the image area of the master 231 wound on the master 6. As a result, the ink roller 267 passes through the master support plate 266, the master 231 and the printing paper P.
And the press roller 257 are pressed against each other, and the print image from the master 231 is transferred to the print paper P. The printing paper P on which the image has been transferred to both sides is released by the release claws 251 to the plate cylinder 25.
After being peeled off from the outer peripheral surface of the sheet No. 4 and conveyed by the sheet discharge conveying member 252, the sheet is discharged onto the sheet discharge tray 253 to complete the plate setting operation. When the printing start key (not shown) is pressed after the printing operation is completed, the printing paper P is continuously fed from the paper feeding unit 207, and the printing drums 254 and 256 are rotated at high speed to perform the printing operation. Will be

At the time of the above-described printing operation and printing operation, each plate cylinder 254, 256 and each press roller 255,
A predetermined printing pressure is applied to each of the plate cylinders 254 and 256 at the time of press contact with the plate 257, and the printing cylinders 254 and 256 are distorted by absorbing and deforming the printing pressure by the elastic members. Without contact, the outer peripheral surfaces of the ink rollers 261 and 267 and the inner peripheral surfaces of the master support plates 260 and 266 come into contact, and the ink is transferred to the printing paper P. At this time, since the deformation of each master support plate 260, 266 itself is suppressed by the deformation of each elastic member, each ink roller 261,
When the 267 and the master support plates 260 and 266 are in linear contact with each other, the amount of ink transferred to the printing paper P is made uniform.

In the sixth embodiment, similarly to the fifth embodiment, each of the plate cylinders 254 and 256 is replaced with a pair of flat plates having a flat portion in the same manner as the plate cylinder 27 shown in the first embodiment. It is also possible to use a plate cylinder provided with a flange and a master support plate, and an ink roller that can swing in accordance with the inner peripheral surface shape of the master support plate. Thereby, since the interval between each plate cylinder and each press roller at the time of separation can be narrowed, noise at the time of press-contact between each plate cylinder and each press roller can be reduced. The pressing means has substantially the same diameter as each of the plate cylinders 254 and 256, and
The plate cylinders 254, 256 rotate in synchronism with the plate cylinders 254, 256.
May be used.

In the first, fourth, fifth and sixth embodiments, the elastic member is provided between the outer peripheral surface of the flange constituting the plate cylinder and the master support plate provided on this outer peripheral surface. Although the arrangement position of the elastic member is not limited to this, the elastic member is arranged between the support shaft and the flange (between the support shaft 29 and the bearing provided on the flange 30 in FIG. 2). The same operation and effect can be obtained.

[0134]

According to the first, ninth, tenth, and eleventh aspects of the present invention, since the plate cylinder has a flat portion, the distance between the plate cylinder and the pressing means can be reduced. The generation of noise during printing can be suppressed, and at the time of press-contact between the plate cylinder and the pressing means, the printing pressure on the plate cylinder is absorbed and deformed by the elastic member, thereby causing distortion in the plate cylinder. Printing can be performed without any need. further,
Since deformation of the master support plate itself is suppressed by deformation of the elastic member, the ink roller and the master support plate come into linear contact with each other, so that the amount of ink transferred to the printing paper is made uniform.

According to the second aspect of the present invention, since the printing pressure is applied to the printing paper by the master support plate swelled by the outer cam, the swelling amount of the master support plate is always set to a constant value. The pressure can be stabilized. Further, since the transfer of the ink to the printing paper is performed by the swelling of the master support plate, the ink roller and the master support plate come into linear contact with each other, and the transfer amount of the ink to the printing paper is made uniform.

According to the third aspect of the present invention, since the swelling of each master support plate for applying the printing pressure is performed by the outer surface cam on one plate cylinder, the swelling amount of the master support plate is constant. And the printing pressure can be stabilized. In addition, since the swelling of the master support plate of the other plate cylinder is performed by the inner surface cam and the tension spring, it is possible to adjust the printing pressure by adjusting the spring force of the tension spring. The interval can be set roughly.

According to the fourth aspect of the present invention, when the plate cylinders are pressed against each other, the elastic member absorbs and deforms the printing pressure, thereby performing double-sided or single-sided printing without causing distortion in each plate cylinder. Also, since the deformation of the master support plate itself is suppressed by the deformation of the elastic member, the ink roller and the master support plate come into linear contact,
The amount of ink transferred to the printing paper is made uniform. Further, since the swelling of the master support plate is performed by the outer cam, the swelling amount of the master support plate becomes constant, and the printing pressure can be stabilized.

According to the fifth aspect of the present invention, when each plate cylinder is pressed against each other, the printing pressure is absorbed by each elastic member and deformed, so that double-sided or single-sided printing can be performed without causing distortion in each plate cylinder. In addition, since the deformation of each master support plate itself is suppressed by the deformation of each elastic member, the ink transfer to the printing paper is achieved by the linear contact between each ink roller and each master support plate. The amount is equalized.

According to the sixth aspect of the present invention, since the plate cylinder has a flat portion, the interval between the plate cylinders can be reduced, thereby suppressing the generation of noise during printing.

According to the seventh aspect of the present invention, when each plate cylinder and each pressing means are pressed against each other, each elastic member absorbs and deforms the printing pressure, thereby preventing each plate cylinder from being distorted. It can perform double-sided printing or single-sided printing,
Since the deformation of each master support plate itself is suppressed by the deformation of each elastic member, the ink transfer amount to the printing paper is made uniform by the linear contact between each ink roller and each master support plate.

According to the eighth aspect of the present invention, since each plate cylinder has a flat portion, the distance between each plate cylinder and each pressing means can be reduced, thereby suppressing generation of noise during printing. it can.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a stencil printing apparatus used in a first embodiment of the present invention.

FIG. 2 is a partial side sectional view of a plate cylinder used in the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state of a plate cylinder and an ink roller used in the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a state of a plate cylinder and ink rollers used in the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a swing mechanism of an ink roller used in a modification of the first embodiment of the present invention.

FIG. 6 is a front view showing a plate cylinder used in a second embodiment of the present invention.

FIG. 7 is a partial side sectional view showing a plate cylinder used in a second embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a fixing member used in a second embodiment of the present invention.

FIG. 9A is an exploded perspective view showing switching means used in the second embodiment of the present invention, and FIG.

10A is an exploded perspective view showing a switching means used in a modification of the second embodiment of the present invention, and FIG.

11A is an exploded perspective view showing a switching means used in another modification of the second embodiment of the present invention, and FIG.

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

FIG. 13 is a schematic front view of a printing unit used in a fourth embodiment of the present invention.

FIG. 14 is a side sectional view of a second plate cylinder used in a fourth embodiment of the present invention.

FIG. 15 is a schematic front view of a printing unit used in a fifth embodiment of the present invention at the time of non-printing.

FIG. 16 is a side sectional view of a printing unit used in a fifth embodiment of the present invention.

FIG. 17 is a schematic front view of a printing unit used in the fifth embodiment of the present invention when printing.

FIG. 18 is a schematic front view of a stencil printing machine used in a sixth embodiment of the present invention.

[Explanation of symbols]

 1, 72, 205 stencil printing machine 15, 100, 107 master 27 plate cylinder 28 pressing means (press roller) 30, 53, 159, 175, 186 flange 31, 160, 176, 187 elastic member 32, 54 master support plate 33 , 179, 190, 264, 270 clamper 34, 57 ink supply means 35 ink roller 41 outer surface cam (cam plate) 52 printing member (printing roller) 126, 155, 170, 254 first plate cylinder 127, 156, 171 256 Second plate cylinder 130,177 First master support plate 131,178,263 First ink supply means 133,181 First ink roller 135 First ink roller moving means 138 Outer surface cam 141,161,188 Second master support plate 142, 189, 269 Supply means 144 second ink roller moving means 145,192 second ink roller 172 moving means 255 first pressing means (pressing roller) 257 second pressing means (pressure roller) P Printing Paper

Claims (11)

[Claims] 1. A plate cylinder having a porous master support plate, pressing means provided so as to be able to press against and separate from the outer peripheral surface of the plate cylinder, and An ink supply unit having an ink roller for supplying ink to an inner peripheral surface; and a clamper for locking a master disposed on a flat portion provided on an outer peripheral surface of the plate cylinder, wherein printing is performed by the pressing unit. In a stencil printing apparatus that performs printing by pressing a sheet against the outer peripheral surface of the plate cylinder, the ink roller is provided movably along an inner peripheral surface of the plate cylinder by an outer surface cam, and A stencil printing apparatus, wherein an outer peripheral surface is provided movably in a radial direction through an elastic member. 2. A plate cylinder having a flexible porous master support plate, a printing member disposed in the vicinity of an outer peripheral surface of the plate cylinder via a paper conveying path, and an inside of the plate cylinder. A stencil printing apparatus comprising: an ink supply unit having an ink roller for supplying ink to an inner peripheral surface of the plate cylinder. The ink roller is capable of being pressed and separated from the master support plate by an outer surface cam. A stencil printing apparatus, wherein printing is performed by pressing a printing sheet with the master support plate and the printing member, which are provided and swelled by pressing the ink roller. 3. A first printing drum having a flexible porous first master support plate, and a flexible porous second master support plate having a paper transport path. A second plate cylinder disposed in close proximity to the first plate cylinder via the first plate cylinder, and a first ink roller provided inside the first plate cylinder and provided on the first master support plate so as to be capable of pressing and separating therefrom. A first ink supply means, and a second ink roller provided inside the second plate cylinder and provided on the second master support plate so as to be able to be pressed against and separated from the first ink roller. A second ink supply unit having: a first ink roller moving unit for moving the first ink roller; and a second ink roller moving unit for moving the second ink roller. Pass the printing paper between the cylinders to move the ink roller moving means. In the stencil printing apparatus for performing printing by swelling and press-contacting the outer peripheral surfaces of the respective plate cylinders, one of the ink roller moving means has an outer surface cam and the other has an inner surface. A stencil printing machine having a cam. 4. A first plate cylinder provided with a flexible porous first master support plate, and a porous second plate disposed in close proximity to the first plate cylinder via a sheet conveying path. A second plate cylinder having a first master support plate, and a first ink supply having a first ink roller provided inside the first plate cylinder and capable of being pressed against and separated from the first master support plate. Means, second ink supply means provided inside the second plate cylinder and having a second ink roller for supplying ink to the inner peripheral surface of the second plate cylinder, and moving the first ink roller And an ink roller moving means, wherein the printing paper is passed between the respective plate cylinders to activate the ink roller moving means, thereby causing the outer peripheral surface of the first plate cylinder to swell and thereby forming the second plate cylinder. A stencil printing apparatus that performs printing by pressing against an outer peripheral surface, wherein the ink roller is moved. A stencil printing machine, wherein the means has an outer cam, and the outer peripheral surface of the second plate cylinder is provided movably in the radial direction via an elastic member. 5. A first plate cylinder having a porous master support plate, and a second plate cylinder having a porous master support plate disposed adjacent to the first plate cylinder via a sheet conveying path. Contacting / separating means for pressing and separating the first plate cylinder and the second plate cylinder, and an ink roller provided inside the first plate cylinder and supplying ink to the inner peripheral surface of the first plate cylinder. And a second ink supply means provided inside the second plate cylinder and having an ink roller for supplying ink to the inner peripheral surface of the second plate cylinder. In a stencil printing apparatus that performs printing by passing the printing paper between the plate cylinders and operating the contacting / separating means and pressing the outer peripheral surfaces of the respective plate cylinders respectively, the outer peripheral surface of each plate cylinder is an elastic member A stencil printing apparatus characterized in that the stencil printing apparatus is provided so as to be movable in the radial direction through the stencil. 6. At least one of the plate cylinders has a flat part on an outer peripheral surface and a clamper for locking a master.
The stencil printing according to claim 5, wherein the ink roller provided on the plate cylinder having the flat portion and the clamper is movably provided along an inner peripheral surface of the plate cylinder by an outer surface cam. apparatus. 7. A first plate cylinder having a porous master support plate, and a first plate cylinder disposed opposite to the first plate cylinder via a sheet conveying path.
A first pressing means provided so as to be able to be pressed against and separated from the plate cylinder, and a side downstream of the first plate cylinder in the sheet conveying direction and opposed to the first plate cylinder via the sheet conveying path. A second plate cylinder having a porous master support plate, and a second plate cylinder disposed opposite to the second plate cylinder via a sheet conveyance path and capable of being pressed against and separated from the second plate cylinder. (2) pressing means, and first ink supply means provided inside the first plate cylinder and having an ink roller for supplying ink to the inner peripheral surface of the first plate cylinder;
A second ink supply unit provided inside the second plate cylinder and having an ink roller for supplying ink to the inner peripheral surface of the second plate cylinder;
A stencil printing apparatus that performs printing by pressing the printing paper against the outer peripheral surface of the second plate cylinder by a second pressing unit after pressing the outer peripheral surface of the plate cylinder of the above. A stencil printing apparatus characterized in that the stencil printing apparatus is provided so as to be movable in the radial direction through the stencil. 8. Each of the plate cylinders is provided with a flat portion and a clamper for locking a master on an outer peripheral surface, and the ink rollers are provided movably along an inner peripheral surface of each plate cylinder by an outer surface cam. The stencil printing apparatus according to claim 7, wherein the stencil printing apparatus is provided. 9. A pair of flanges are attached at intervals in the axial direction of a spindle of the plate cylinder, and both ends of the master support plate are supported by these flanges. The said elastic member is arrange | positioned between the inner peripheral surface of a support plate, The Claim 1, Claim 4, Claim 5, Claim 6, Claim 7, Claim 7, or Claim 8 characterized by the above-mentioned.
A stencil printing apparatus as described in the above. 10. A pair of flanges are attached at intervals in the axial direction of the spindle of the plate cylinder, and both ends of the master support plate are supported by these flanges. 9. The stencil printing apparatus according to claim 1, wherein the elastic member is disposed between the stencil printing apparatus and the stencil printing apparatus. 11. The outer cam includes a portion for moving the ink roller in accordance with the rotation of the plate cylinder, and a fixed portion for separating the ink roller from the inner peripheral surface of the plate cylinder regardless of the rotation of the plate cylinder. 9. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus has a part to be held at a position.