JPH0781202A - Stencil type plate making perfector - Google Patents

Abstract

PURPOSE:To automate perfect printing by a method wherein printing is made on one side of paper fed from a paper supply part to a printing part in a single- side printing process, a paper discharge tray is moved to be opposed to a second paper supply part, and printing is made on the other side of the paper in a perfecting process. CONSTITUTION:A plate making printer provided with a plate making part 2, a plate supply part 3, a plate discharge part 8, and a printing part 10 comprises a first paper supply part 4 for feeding unprinted paper 42 toward the printing part 10, a first paper discharge tray 61 on which paper 42f subjected to single-side printing is stacked, a second paper discharge tray 71 on which paper 42b subjected to perfecting is stacked, a second paper supply part 9 for feeding the paper 42f on the first paper discharge tray 61 toward the printing part 10 when the first paper discharge tray 61 movable by a paper discharge tray moving means is positioned on a second position P2, and a paper discharge feed device 50 shakable by a feed path change-over means between a first paper discharge position HP1 to the first paper discharge tray 61 and a second paper discharge position PH2 to the second paper discharge tray 71.

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,
More specifically, the present invention relates to a stencil type plate making and printing apparatus capable of double-sided printing, which automatically prints images on both sides of a printing paper.

[0002]

2. Description of the Related Art Conventionally, a master for stencil printing that has been prepressed is wound around an outer peripheral surface of a printing drum, and an image is formed on the printing paper by pressing the printing paper with the press roller. Type stencil printers are well known.

By the way, in recent printed matter, double-sided printing tends to increase for reasons such as paper saving and prevention of an increase in file storage space. 70 to 80% of users who actually use a stencil printer in the market. Is printing on both sides. When performing double-sided printing using such a stencil printing machine, first perform one-sided printing, then re-align the end faces of the one-sided printed paper cleanly and place the one-sided printed paper in the paper feed tray of the stencil printing machine. The method was to set it inside out so that the side of the was the back side, and then print the remaining one side. As for automatic double-sided printing in a stencil printing machine, Japanese Patent Application No. 4-232283 discloses that
A technique capable of simultaneous double-sided printing with two printing drums has already been proposed.

On the other hand, in a plain paper (PPC) copying machine, an automatic double-sided copying apparatus has already been put to practical use and is generally used. Examples of this automatic double-sided copying apparatus are disclosed, for example, in Japanese Patent Laid-Open Nos. 64-3674 and 64-8162, both of which are carried on a complicated paper carrying path in a copying machine. As a means for doing this, a method is used in which the copied sheets are pressed against each other by a pair of rollers and rollers.

[0005]

However, in the conventional manual operation method, since the discharged sheets stacked on the discharge tray are not properly aligned, the operator should rearrange them and turn them over to the sheet feeding tray. Setting is generally a difficult and tedious task for the operator. In addition, it is easy to know if the ink in the printed images will stain your hands when aligning them by hand, or in what direction when you set them in the paper feed tray that the front and back sides will be printed correctly. There is a problem that it is difficult.

Further, in the technique capable of simultaneous double-sided printing with two printing drums, there are problems that the apparatus becomes large because it has two printing drums, and that the structure is complicated and the cost is high.

On the other hand, when the above technique of a copying machine is diverted to a stencil printing machine, the printed matter immediately after printing is not in a so-called set state because the ink has dried, so that the printed image surface is not covered. If the roller is pressed and conveyed, there is a problem in that the image surface is contaminated with roller marks. Further, in the case of a stencil printing machine, since the number of printed materials produced from one original is large, an automatic double-sided intermediate tray with a small paper storage capacity such as a copying machine is not sufficient. There is also a problem in that the method of pressing the image surfaces with a roller to bring them to one side for alignment cannot be adopted because the stains on the rollers will appear.

Therefore, in order to solve such a problem, the present invention requires no operator's hand work.
An object of the present invention is to provide a new stencil printing apparatus capable of automatically performing double-sided printing on the front surface and the back surface of paper.

[0009]

In order to achieve the above-mentioned object, in the invention according to claim 1, a plate making section for punching a master for heat-sensitive stencil plate by plate making means, and a plate making plate made by the plate making section. The plate making section for conveying the used master and winding it around the printing drum, the plate discharging section for separating the used master from the printing drum and storing it, and supplying the ink from the inner peripheral side of the printing drum to make the plate. In a stencil-type plate-making printing apparatus having a printing unit for transferring the ink from the holes of the master to a printing paper, the papers before printing are stacked, and the papers are separated one by one and directed toward the printing unit. First to feed
Sheet feeding section, a first position where the single-sided printed sheet printed by the printing section should be ejected / stacked, and a single-sided printed sheet is fed for printing on the remaining single-sided sheet by the printing section. A first discharge tray that is movable between a second position and a second position, and a double-sided printed sheet printed by the printing unit on the remaining one side of the single-sided printed sheet. When the second paper ejection tray and the first paper ejection tray occupy the second position, the one-side printed paper on the first paper ejection tray is separated one by one to the printing unit. A second paper feed unit that feeds toward the first paper ejection tray and a paper ejection tray moving unit that selectively moves the first paper ejection tray between the first position and the second position, and are connected to the printing unit. The single-sided printed sheet discharged from the printing unit is placed on the first paper output tray occupying the first position, and the double-sided printed sheet is secondly printed. A paper discharge conveyance that is swingable between a first paper discharge position to the first paper discharge tray and a second paper discharge position to the second paper discharge tray for respectively conveying to the paper discharge trays. And a delivery path switching unit that selectively moves the delivery delivery unit to the first delivery position and the second delivery position.

According to a second aspect of the present invention, in the first aspect of the present invention, the first sheet ejection tray is arranged below the second sheet ejection tray, and a plate-forming sheet fed immediately after plate making, and The test printing paper is discharged to the second paper discharge tray.

According to the invention of claim 3, claim 1 or 2
In the invention described above, after the stacking of the single-sided printed sheets on the first paper ejection tray is completed, a pause time until the single-sided printed sheets are separated and fed by the second paper feeding unit is The waiting time is set to be longer than the plate-making time of the master for the remaining one-sided printing of the remaining one-sided printed paper.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the paper discharge tray moving means moves the first paper discharge tray toward the second paper feeding section. And a swing guide means for swinging the first paper discharge tray toward the second paper feed section with the movement guide means itself as one swing fulcrum.

[0013]

According to the first aspect of the invention, in the single-sided printing process, the sheet before printing is fed from the first paper feeding section to the printing section and printed on one side of the sheet, and the single-side printed sheet is printed. By moving the paper discharge / transport means to the first paper discharge position by the transport path switching means, the paper is discharged / loaded onto the first paper discharge tray occupying the first position. After the one-sided printing is completed, the first paper discharge tray is moved to the second position by the paper discharge tray moving means and is exposed to the second paper feed unit. In the double-sided printing process, the single-side printed sheet is fed from the second paper feeding section to the printing section and printed on the remaining one side of the single-side printed sheet. This double-sided printed sheet is discharged and stacked on the second discharge tray by swinging the discharge conveying means to the second discharge position by the conveying path switching means. Further, the single-side printed sheet and the double-side printed sheet immediately after printing are conveyed by the sheet discharge conveying means without rubbing each image side.

According to the second aspect of the present invention, the plate-making sheet and the test printing sheet fed immediately after the plate making are discharged to the second sheet discharging tray arranged above the first sheet discharging tray. It

According to the third aspect of the present invention, the single-side printed sheet is separated and fed by the second sheet feeding unit after the stacking of the single-side printed sheet on the first paper discharge tray is completed. The rest time of the single-sided printed paper is set by setting the rest time to a time longer than the master making time of the master for single-sided printing of the remaining one-sided printed paper Since the image of the one-sided printing on the one-sided printed sheet is in a dry state during the one-sided printing of the one-sided printed sheet, the image of the one-sided printing of the one-sided printed sheet is rubbed and smeared when being fed to the printing section in the second paper feeding section. Absent.

According to the fourth aspect of the invention, the first guide tray is moved toward the second sheet feeder by the movement guide means of the discharge tray moving means, and the discharge tray moving means is shaken. The first guide tray is swung toward the second sheet feeder by the movement guide means with the movement guide means itself as one swing fulcrum.

[0017]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the overall construction of a stencil-type plate-making printing apparatus capable of double-sided printing, to which an embodiment of the present invention is applied. First, the overall configuration will be described.

In the figure, reference numeral 1000 indicates a stencil type plate making and printing apparatus capable of double-sided printing. The stencil-type plate-making / printing apparatus 1000 capable of double-sided printing includes a document reading unit 1 for reading images on the surfaces of documents A and B transferred from a document receiving base 1a arranged on an upper part of a machine body 500, and this document reading. The plate making unit 2 which is arranged on one side of the machine body unit 500 below the apparatus 1 and perforates the heat-sensitive stencil master 21 by the thermal head 23 as a plate making unit, and the plate-making master made by the plate making unit 2. The plate feeding unit 3 that conveys and winds around the printing drum 31, and the machine body unit 50 at the lower left of the document reading apparatus 1.
Ink is supplied from the inner peripheral side of the printing drum 31, which is disposed on one side of the printing drum 31 and which is used to separate and store the used master from the printing drum 31, and the printing drum 31 which is disposed substantially at the center of the machine body 500. Then, the printing unit 10 that transfers ink from the holes of the plate-prepared master to the printing paper 42 and the unprinted paper 42 that is arranged below the plate-making unit 2 are stacked, and the papers 42 are separated one by one. The first paper feed unit 4 that feeds toward the printing unit 10 and the leftmost lower part of the machine body unit 500, which should be discharged and loaded with the single-sided printed paper 42f printed by the printing unit 10. A first paper ejection tray 61 movable between a first position P1 and a second position P2 to be fed for printing by the printing unit 10 on the remaining one surface of the one-side printed sheet 42f; Select the first paper ejection tray 61 between the first position P1 and the second position P2. Discharge tray moving means to move the 10
A first paper discharge section 6 having 0 (shown in FIGS. 2 and 3);
A second paper discharge unit 7 having a second paper discharge tray 71 for discharging and stacking the double-sided printed paper 42b printed by the printing unit 10 on the remaining one side of the single-sided printed paper 42f; When the paper ejection tray 61 of occupies the second position P2, the single-side printed paper 42f on the first paper ejection tray 61 is separated one by one and is fed toward the printing unit 10. Paper section 9,
The single-side printed paper 42f that is connected to the printing unit 10 and is discharged from the printing unit 10 is placed in the first paper ejection tray 67 that occupies the first position P1, and the double-sided printed paper 42b is placed in the second paper ejection tray 71. First discharge tray 6 for transporting to each
1, a first sheet discharge position HP1 to the first sheet discharge position HP2 to the second sheet discharge tray 71, and a second sheet discharge position HP2 to the second sheet discharge tray 71. The transport unit 50 is connected to the first paper discharge position HP1 and the second paper discharge position HP.
2, and a separation position close to the outer periphery of the printing drum 31 for separating the printed paper from the printing drum 31, and a non-separation position separated from the separation position. And a sheet discharging and conveying section 5 having a separating claw 39 which is movable between the sheet and the sheet.

The above-mentioned document reading section 1, plate making section 2, plate feeding section 3, plate discharging section 8, printing section 10, first sheet feeding section 4, first sheet discharging tray 61 and second sheet discharging section will be described below. The configurations of the paper tray 71, the second paper feeding unit 9, the paper discharge tray moving unit 100, the paper discharge transport unit 50, and the transport path switching unit 120 will be described.

In FIG. 1, the document reading unit 1 sets an ADF (not shown) when a plurality of documents are set on the document tray 1a.
While the sheets are sequentially conveyed one by one by the (automatic document feeder), the image of the document is optically read by a reading unit (not shown) and C
An image sensor (not shown) such as a CD (charge coupled device) can be converted into an electric signal and output to the plate making unit 2. The document reading unit 1 is, for example, Japanese Patent Application No. 4-35.
Since it has the same configuration as that of No. 217, detailed description thereof will be omitted.

The plate-making section 2 is a roll-shaped heat-sensitive stencil plate comprising a thermoplastic resin film and a porous flexible support (both not shown) supported by a side plate (not shown) of the machine body section 500 so as to be able to be drawn out. Master 21 for printing and a thermal head 23 for perforating and plate-making the master 21 based on the image information of the document.
And a platen roller 22 that conveys the master 21 to the downstream side of the master conveying path while pressing the master 21. The thermal head 23 has a plurality of heating elements arranged in a line, and generates heat in a pulsed manner according to image information of an original sent from the original reading unit 1 to selectively select a thermoplastic resin film portion (not shown). It has a well-known structure and function of heating and punching. The platen roller 22 has a body portion 500.
Is rotatably supported by a side plate (not shown) and is rotationally driven in the direction of arrow A by a stepping motor (not shown).

The plate feeding section 3 is provided on the downstream side of the master conveying path, and is provided with a cutter 25 for cutting the plate-making master 21a into a predetermined length, and a downstream side of the cutter 25 of the master conveying path. A guide plate (not shown) for guiding the tip of the plate-made master 21a to a clamper 32 (described later), and a stepping motor (not shown) for conveying the plate-made master 21a to the clamper 32 (described later). It is mainly composed of a pair of conveying rollers 24a and 24b which are rotationally driven by.

The plate discharge section 8 presses a used master (not shown) on the printing drum 31 to use it.
Scoop up from the rear edge of the
A pair of peeling rollers 8 pressed against each other for peeling and discarding in a plate discharge storage box 83 (described later) in synchronization with the rotation of
1, 82 and a plate discharge storage box 83 for storing a used master (not shown). Peeling roller pair 8
1, 82 are rotationally driven by a motor (not shown).

The printing unit 10 has a plate-making master 21 on the outer peripheral surface.
A printing drum 31 having a wound around it and rotating about a rotation center axis 34, an ink supply unit 35 for supplying ink to the inner peripheral surface of the printing drum 31, and a plate making apparatus provided on the outer peripheral surface of the printing drum 31. The clamper 32 that holds the leading end of the finished master 21a and the press roller 33 that is provided near the outer peripheral surface of the print drum 31 and presses a sheet (not shown) against the outer peripheral surface of the print drum 31 are mainly included. It is configured.

The printing drum 31 has a structure in which a support cylinder having a large number of openings formed therein and a mesh screen (both not shown) are wound around the outer peripheral surface of the support cylinder.
It is rotatably supported around the rotation center shaft 34. The printing drum 31 is rotationally driven in a clockwise direction and a counterclockwise direction by a motor (not shown). Clamper 32
Is opened and closed at a predetermined position by an opening / closing means (not shown).

The ink supply means 35 is disposed inside the printing drum 31, is rotatably supported by a side plate (not shown) in the printing drum 31, and is rotationally driven in the direction of arrow A in the figure in synchronization with the printing drum 31. Ink roller 36
And a doctor roller 38 which is provided with a slight clearance from the outer surface of the ink roller 36 and forms a wedge-shaped ink reservoir 37 between the ink roller 36 and the ink roller 37, and also serves as the rotation center shaft 34 and the ink reservoir 37. It is mainly composed of an ink pipe shaft 34 for supplying ink to the ink pipe shaft 34.

A press roller 33 is disposed at a lower position facing the ink roller 36 so as to come into contact with and separate from the print drum 31, and the press roller 33 is attached to the print drum 31 by a mechanism including a cam and a spring (not shown). It has a well-known configuration of selectively contacting and separating. The press roller 33 is
Paper (not shown) when paper (not shown) is fed
It presses against the printing drum 31 via, and the paper (not shown) is continuously pressed against the printing drum 31 while being driven and rotated.

The first paper feed unit 4 feeds the paper 42 between the print drum 31 and the press roller 33 at a predetermined timing between the paper feed table 41 for stacking the paper 42 before printing and the print drum 31. The roller pair 45a, 45b and the feed roller pair 45a, 45b are arranged on the downstream side of the sheet conveying path, and are placed between the print drum 31 and the press roller 33.
Guide plate 47 for guiding the paper, and a paper feed roller 43 for contacting the uppermost paper 42 surface on the paper feed table 41 and distributing the paper.
And the paper 42 which is arranged on the downstream side of the paper feed roller 43.
Paper multi-feed prevention mechanism 14 that sequentially separates and feeds each sheet
4, the feed roller pairs 45a and 45b, and the feed roller pair 45a and 45b,
It is mainly composed of a guide plate 48 for guiding the paper 42 to 45b. The paper double feed prevention mechanism 144 is
It has a mechanism in which the separation pad 46 is pressed against the separation roller 44 by a spring, for example, a structure similar to that shown in Japanese Patent Application No. 4-103077, and detailed description thereof is omitted to avoid duplication. Further, the lower curved surface of the guide plate 48 in the drawing also serves as a guide plate 97o of the reverse conveyance path 99 described later.

As shown in FIGS. 2 and 3, the first paper discharge tray 61 is integrally formed with a paper discharge tray 61b for accommodating and storing the single-side printed paper 42f and one end of the paper discharge tray 61b. An end fence 67 for aligning one end of the single-side printed paper 42f, a plurality of rollers 62 rotatably provided on both sides of the paper discharge tray 61, and movable in both side directions of the paper discharge tray 61b. Single-sided printed paper 42 provided and stacked in
A pair of side guides 66 for aligning both side edges of f
It is mainly composed of a and 66b. A connecting and fixing portion 61a fixed to a chain 64 (which will be described later) is protruded and offset to the outside (in a direction orthogonal to the plane of the drawing) of both side edges of the paper discharge tray 61b at a substantially central portion of the paper discharge tray 61b. The connecting and fixing portion 61a is provided on the chain 64.
It is fixed (see below).

As shown in FIGS. 2 and 3, the paper discharge tray moving means 100 is a horizontal moving mechanism 1 as a moving guide means.
30 and an elevating mechanism 140 as swing guide means. The horizontal movement mechanism 130 includes a horizontal rolling surface 63f formed substantially horizontally on the second position P2 side for rolling the plurality of rollers 62 and the first position P1 to the second position P1.
The guide rails 63 each having an inclined rolling surface 63r that becomes an uphill toward 2 and the first paper discharge tray 61 are fixed by the connection fixing portion 61a, and are rotatably supported by the guide rails 63. A chain 6 for hanging the sprockets 70a, 70b and 70c and moving the first paper discharge tray 61 to the first position P1 and the second position P2.
4 and a horizontal drive motor 65 fixed to one end of the guide rail 63 and provided with a sprocket 70c. At the other end of the guide rail 63, a stopper 63s for holding the first paper discharge tray 61 at the first position P1 and stopping the roller 62 is formed. Guide rail 63, sprockets 70a, 70b,
70c and the chain 64 are juxtaposed on both sides of the paper discharge tray 61b, and the guide rails 63 are integrally connected by a connecting portion (not shown). Sprocket 70
The a is rotatably supported on the other end of the guide rail 63. The sprocket 70b has a horizontal rolling surface 63f.
And a tilted rolling surface 63r are substantially rotatably supported by a fulcrum shaft 101 as one swing fulcrum fixed to a side plate (not shown) of the machine body.

The elevating mechanism 140 includes a rack 103 formed downwardly extending in a fan shape on one end side of the guide rail 63, and a pinion fixed to a side plate (not shown) of a machine body near the rack 103 and meshing with the rack 103. It is mainly composed of a lifting drive motor 102 having 104 and a fulcrum shaft 101 for supporting the guide rail 63 so as to be swingable.

1 to 3, the second paper feed section 9 has a first paper discharge tray 61 on which a single-side printed paper 42f is stacked and moved to a second position P2, a printing drum 31, and a press. A pair of feed rollers 45a, 45b for feeding the single-side printed sheet 42f to the roller 33 at a predetermined timing.
And a guide plate 47 that is arranged on the downstream side of the paper conveyance path of the feed roller pair 45a and 45b and that guides the one-side printed paper 42f between the printing drum 31 and the press roller 33.
A second paper feed roller 91 that abuts on the top of the single-side printed paper 42f on the paper discharge tray 61 and distributes the paper, and a single-side printed paper that is arranged downstream of the second paper feed roller 91. 42f
Paper multi-feed prevention mechanism 14 that sequentially separates and feeds each sheet
5, the feed roller pair 45a, 45b, and the feed roller pair 45a, 45b arranged between the feed roller pair 45a, 45b and the sheet double feed prevention mechanism 145.
The reverse conveyance path 99 for guiding the single-sided printed sheet 42f to the 45b, the abutting plate 68 fixed to the side plate (not shown) of the machine body section for abutting and aligning one end of the single-sided printed sheet 42f, and the abutting plate 68. A sensor 69 provided on one side wall of the contact plate 68 for detecting the abutting state of one end of the one-side printed sheet 42f against the contact plate 68, and a sensor 69 fixed to a side plate (not shown) of the machine body and loaded on the first discharge tray 61. It is mainly configured by a top dead center detection sensor 94 for detecting the top dead center position of the stored single-side printed paper 42f.

The reverse conveyance path 99 has a substantially U-shape, and is a guide plate 96 disposed on the side of the sheet double feed prevention mechanism 145.
o, 96i, the guide plates 97o, 97i arranged on the feed roller pair 45a, 45b side, and the single-sided printed sheet 42f arranged between these guide plates for the feed roller pair 4
5a, 45b a pair of intermediate transfer rollers 93a, 9
3b and the main components.

The sheet double feed prevention mechanism 145 is a mechanism in which the second separation pad 95 is pressed against the second separation roller 92 by a spring, and has a structure similar to that shown in Japanese Patent Application No. 4-103077, for example. , And detailed description thereof is omitted to avoid duplication. Limit switches are used as the sensors 69 and 94, for example.

In FIG. 1, the second discharge tray 71 is
The machine body part 50 above the second paper discharge part 6 is opposed to the downstream side end of the paper discharge transport unit 50 occupying the second paper discharge position HP2.
It is fixed at 0. The second paper ejection tray 71 includes a paper ejection tray 71b for stacking and storing double-sided printed paper 42b, printing paper and test printing paper fed immediately after plate making, and a paper ejection tray 7
Double-sided printed paper 42 integrally formed at one end of 1b
an end fence 73 for aligning one end of b, and a pair of side guides 74a, 74b for aligning both side edges of a double-side printed sheet 42b that is movably provided in both side directions of the sheet discharge tray 71b and is stacked. It is mainly composed of.

As shown in FIGS. 1 and 4, the discharge conveyance unit 50 is arranged between a pair of side plates 59a and 59b, and is fixed to a drive roller 52 fixed to a drive shaft 52s and a driven shaft 53s. A plurality of endless belts 54 wound around the driven roller 53 and having a plurality of openings 54a.
And an air suction fan 55 that sucks the air in the paper discharge transport unit 50 and sucks the printed paper that is being transported onto the endless belt 54. The discharge conveyance unit 50 includes a plurality of endless belts 54 and an endless belt 5.
The sheet conveying surface 51u provided between the four sheets, the casing side members 51s attached to the lower portion of the outer periphery of the sheet conveying surface 51u, and the casing side members 51s attached to the lower portions of the casing side members 51s. The case lower member 51d forms a substantially case structure. The endless belt 54 is made of synthetic resin, but may be made of a material such as rubber.

The transport path switching means 120 comprises a pair of side plates 5.
Racks 58a and 58b provided on the racks 9a and 59b, and a pinion 57a that meshes with the racks 58a and 58b.
57b and a shaft 5 that connects both pinions 57a and 57b
6, a worm wheel 121 provided on the shaft 56, and a worm 122 meshing with the worm wheel 121. The racks 58a and 58b are the drive shaft 52.
It is formed in a fan shape centered on s. A bracket 51B is fixedly attached to the lower part of the housing lower member 51d,
A shaft 56 is rotatably supported at both ends of the bracket 51B. First paper discharge position H of the paper discharge transport unit 50
A signal sent from a control unit (not shown) of the stencil plate making / printing apparatus is input to a control unit (not shown) for the swinging to P1 and the second paper discharge position HP2, and an output signal from this control unit is provided. Is input to a motor (not shown) connected to the worm 122.

Normally, the paper discharge / conveyance unit 50 is rocked / held by the conveyance path switching means 120 so as to occupy the second paper discharge position HP2, and the printed paper is stored in the second paper discharge tray 71. (Each printed matter, which will be described later, "printing", "trial printing", and double-sided printing) is ejected.

Next, the operation of this stencil plate making and printing apparatus will be described with reference to the flow charts of FIGS. In FIG. 1, for example, two originals A and B are set on the original tray 1a of the original reading unit 1. An operator makes a plate-making start key on the operation panel (not shown)
When is pressed, only the second original B is first sent to the reading unit (not shown) to read the image. That is, the document B is optically read by a reading unit (not shown) while being conveyed by an ADF (automatic document feeder) not shown, and photoelectrically converted by an image sensor (not shown). The photoelectrically converted electric signal is input to an analog / digital (A / D) conversion board (not shown),
The image information of the original B converted into the digital signal is sequentially sent to the plate making section 2.

In the plate making section 2, substantially in parallel with the image reading operation of the original B, the plate making and plate feeding steps are carried out based on the digitalized image information of the original B. That is, the master 21 in the rolled state is conveyed while being fed out by the platen roller 22 rotating in the direction of arrow A while pressing the master 21 against the thermal head 23.
In the thermal head 23, a plurality of heating elements selectively generate heat on the basis of the image information of the document B from the document reading unit 1 with respect to the master 21 conveyed in this way, and the master 21 is heated.
Perforate plate making.

In this way, the plate-making master 21A in which the image of the original B is perforated and plate-formed is composed of the conveying roller pair 24a of the plate supply section 3,
At 24b, it is sent toward the outer peripheral side of the printing drum 31, the direction of travel thereof is changed downward by a guide plate (not shown), and it is conveyed toward the expanded clamper 32 of the printing drum 31 in the plate feeding position. .

The tip of the plate-made master 21A is clamper 3
When it reaches 2, the clamper 32 is closed at a predetermined timing and the front end portion is held. When the leading end of the plate-made master 21A is clamped by the clamper 32, the plate-made master 21A is wound around its outer periphery while the printing drum 31 intermittently rotates in the direction of arrow A. Then, the plate-prepared master 21A is cut by the cutter 25 into a certain length.

In this way, when the plate-made master 21A corresponding to one plate of the document B is completely wound around the printing drum 31,
The plate making process and the plate supplying process are completed, and the image printing process of the document B (hereinafter referred to as “single-sided printing process”) is started. In the single-sided printing process, first, the paper 42 on the paper feed table 41 of the first paper feed unit 4 is conveyed by the paper feed roller 43 coming into contact with the uppermost paper 42 and rotating, and the paper double feed is performed. The separation roller 44 of the prevention mechanism 144 separates the sheets one by one, and the sheet is conveyed toward the pair of feed rollers 45a and 45b while being guided by the guide plate 48. The paper 42 is further fed to the print drum 3 by the feed roller pair 45a and 45b.
It is fed to the printing unit 10 while being guided by the guide plate 47 at the same timing as the rotation of 1.

When the fed paper 42 is fed between the print drum 31 and the press roller 33, the press roller 33 separated below the outer peripheral surface of the print drum 31 is timed with this. Moved up. The press roller 33 is pressed against the plate-making master 21A wound around the outer peripheral surface of the printing drum 31 via the paper 42, so that the paper 42 is pressed by the plate-making master 21A, and the ink is transferred from the inner peripheral surface of the printing drum 31. Is transferred to the surface of the paper 42 through the holes of the plate-made master 21A, and a print image of the original B is formed.

Now, the image of the document B is read as described above, and the perforated plate 2 is perforated according to the image.
When 1A is completely wound around the outer circumference of the printing drum 31, printing of the first sheet is performed. Then, in the case of this stencil-type plate-making printing apparatus, the first printed matter immediately after the plate-making winding is referred to as "plate-making" printing and is excluded from the official printed matter for checking the printed image. In addition, one or two sheets may be printed to confirm the print image position, which is called “test printing” printing, and this is also excluded from the official printed matter.

One sheet of single-side printed paper 42f for "plate making" on which the image of the original B is formed is separated from the printing drum 31 by the separating claw 39 moved to the separating position, and is conveyed by the conveying path switching means 120. The second paper discharge tray 71 is swung to and held by the second paper discharge position HP2 by the second paper discharge tray 71.
The paper is discharged and loaded. That is, one sheet of single-sided printed paper 42 f for “printing” is conveyed to the second paper ejection tray 71 by the endless belt 54 of the paper ejection conveyance unit 50,
So-called "printing" printing is completed. At this time, the single-side printed sheet 42f is conveyed while being adsorbed to the surface of the endless belt 54 by the air in the sheet discharge conveying unit 50 being sucked downward from the opening 54a of the endless belt 54 by the air suction fan 55. To be done.

Next, when the operator confirms the single-side printed paper 42f for "plate printing" discharged / stacked on the second paper discharge tray 71 and the result is OK, the numeric keypad (not shown) on the operation panel is shown. Set the number of sheets to print, press the automatic double-sided key (not shown), and then press the print start key (not shown). Then, the steps of feeding, printing, and discharging are repeatedly performed by the same number of prints as the set number of sheets in the same process as the above-mentioned "plate-making" printing, and the single-side printed sheet 42f is conveyed by the sheet discharge conveying unit 50 in the conveying path. By the switching unit 120 swinging from the second paper discharge position HP2 to the first paper discharge position HP1, and the single-side printed paper 42f is transported by the same operation as the above-described operation of the paper discharge transport unit 50, First
The sheets are sequentially ejected and stacked on the sheet ejection tray 61 with the printed image side facing up. At this time, the switching operation from the second paper discharge position HP2 of the paper discharge transport unit 50 to the first paper discharge position HP1 by the transport path switching means 120 is performed as follows. That is, a motor (not shown) of the transport path switching means 120 is driven to rotate the worm 122, and the worm wheel 121 meshing with the worm 122, the shaft 56, and the pinions 57a and 57b are sequentially rotated to sequentially discharge the paper. The unit 50 moves along the racks 58a and 58b around the drive shaft 52s as the first paper discharge position HP1.
Is rocked to.

When the printing of the one-side printed sheet 42f on which the image of the original document B is formed is completed in this way, the plate discharging process by the operation of the plate discharging section 8 is executed. First, the printing drum 31 rotates counterclockwise, and the rear end of a used master (not shown), in which the image of the document B on the outer peripheral surface of the printing drum 31 is perforated, approaches the peeling rollers 81 and 82. While the rollers 81 and 82 rotate in the direction of the arrow in the figure, the rear end portion of the used master (not shown) is scooped up by one peeling roller 81, and the used master (not shown) is the rollers 81 and 82. At 82, in synchronization with the rotation of the printing drum 31, it is separated and conveyed, and is pushed into the plate discharge storage box 83 and discharged.

In this way, when the used master (not shown) in which the image of the document B is perforated and printed is peeled off from the outer peripheral surface of the printing drum 31 and the plate discharging process is completed, the first sheet is read by the document reading unit 1. Document A is sent to a reading unit (not shown). That is, similar to the image reading operation of the document B, the document A is optically read by a reading unit (not shown) while being conveyed by an ADF (automatic document feeder) not shown, and an image sensor (see FIG. Photoelectric conversion is performed (not shown).
This photoelectrically converted electric signal is an analog signal (not shown).
The image information of the original A, which is input to the digital (A / D) conversion substrate and converted into a digital signal, is sequentially sent to the plate making unit 2.

In the plate making section 2, similar to the plate making process of the document B, the plate making and plate feeding processes of the document A are performed substantially in parallel with the image reading operation of the document A based on the image information of the document A digitized. Done. The master 21 in the roll state
The platen roller 22 transfers the master 21 to the thermal head 23.
By pressing in the direction of arrow A while rotating,
It is conveyed while being unrolled. With respect to the master 21 conveyed in this way, the thermal head 23 is provided with the document reading unit 1
A plurality of heating elements selectively generate heat based on the image information of the original A from the above, and the master 21 is perforated and plate-made.

The plate-making master 21B in which the image of the document A is perforated and plate-formed in this manner is the pair of conveying rollers 24a,
At 24b, it is sent toward the outer peripheral side of the printing drum 31, the direction of travel thereof is changed downward by a guide plate (not shown), and it is conveyed toward the expanded clamper 32 of the printing drum 31 in the plate feeding position. .

The tip of the plate-making master 21B is clamper 3
When it reaches 2, the clamper 32 is closed at a predetermined timing and the front end portion is held. When the front end of the plate-made master 21B is held by the clamper 32, the plate-made master 21B is wound around the outer periphery of the printing drum 31 while intermittently rotating in the direction of arrow A. Then, the plate-made master 21B is cut into a certain length by the cutter 25.

On the other hand, the original A on which the one-sided printing process has been completed
In parallel to the plate making process, the conveyance path switching unit 120 swings the sheet discharge and transport unit 50 from the first sheet discharge position HP1 to the second sheet discharge position HP2, and the sheet discharge tray moving unit 100 moves the sheet discharge unit HP1. The movement operation of the first sheet discharge tray 61 from the first position P1 to the second position P2 is performed.

That is, the first to second sheet discharge positions HP1 to HP2 of the sheet discharge / transport unit 50 by the transport path switching means 120.
The operation of switching to the paper discharge position HP2 is performed in the opposite direction to that in the above-described single-sided printing process, and the motor (not shown) of the transport path switching unit 120 is rotationally driven in the opposite direction and the worm 1
22 is rotated, the worm wheel 121 meshing with the worm 122, the shaft 56, and the pinion 57.
The a and 57b are sequentially rotated, and the paper discharge conveyance unit 50 is swung to the second paper discharge position HP2 about the drive shaft 52s along the racks 58a and 58b.

On the other hand, from the first position P1 to the second position P of the first paper discharge tray 61 by the paper discharge tray moving means 100.
The movement operation to 2 is performed as follows. That is,
In FIG. 1 or FIG. 2, first, the horizontal drive motor 65 of the horizontal movement mechanism 130 is rotationally driven in the direction of arrow A to convey the chain 64 in the direction of arrow X, so that the roller 62 of the first paper ejection tray 61 is rotated. Is rolled on the inclined rolling surface 63r and the horizontal rolling surface 63f on the guide rail 63, and when one end of the one-side printed paper 42f stacked on the first paper discharge tray 61 contacts the abutting plate 68, the sensor When 69 detects this, the rotation drive of the horizontal drive motor 65 is stopped. In this way, the first paper discharge tray 61 is moved to the position shown in FIG.

Then, in FIG. 3, the lifting drive motor 102 of the lifting mechanism 140 is driven to rotate in the direction of arrow B to rotate the pinion 104 meshing with the rack 103, whereby the guide rail 63 causes the first paper discharge. The fulcrum shaft 10 with the tray 61, the horizontal drive motor 65 and the like mounted thereon.
It is swung upward with 1 as the swing center. And
When the top dead center detection sensor 94 detects the top dead center position of the single-side printed sheet 42f, the lifting drive motor 10
The driving of No. 2 is stopped, and the first paper discharge tray 61 occupies the second position P2.

Then, similar to the one-sided printing process, the "printing" printing or the "test printing" printing of the image of the original A is performed. First, the single-side printed paper 42f on the first paper ejection tray 61 occupying the second position P2 is the second paper feed roller 91.
Is brought into contact with the uppermost one-side printed sheet 42f and is rotated to be conveyed, and the second sheet double feeding prevention mechanism 145 has a second
The guide plates 96 are separated one by one at the separation rollers 92.
O, 96i guided intermediate transfer roller pair 93a, 9
3b, and further guided by the guide plates 97o and 97i toward the feed roller pair 45a and 45b. In this way, one sheet of the single-side printed sheet 42f for "plate-making" has the image surface of the original document B inverted in the reverse conveyance path 99 in this manner, and the feed roller pair 45a, 4a
It is fed to the printing unit 10 while being guided by the guide plate 47 at the same timing as the rotation of the printing drum 31 by 5b.

In this way, when one sheet of single-side printed paper 42f for "plate-making" is fed between the printing drum 31 and the press roller 33, the outer peripheral surface of the printing drum 31 is lowered at the same timing as this. Press roller 33 that was separated from
Is moved upwards. The press roller 33 is pressed against the plate-making master 21B wound around the outer peripheral surface of the printing drum 31 via the single-side printed paper 42f,
The remaining surface of the one-side printed sheet 42f is pressed against the plate-made master 21B, and ink is transferred from the inner peripheral surface of the printing drum 31 to the remaining surface of the one-side printed sheet 42f through the holes of the plate-made master 21B. The image of the document A is formed into the double-sided printed sheet 42b.

One sheet of double-sided printed paper 42 for "printing"
b is the separation claw 39 that has been moved to the separation position and is the printing drum 3
1 is peeled off, and the second by the transfer path switching means 120.
The paper is ejected and stacked on the second paper ejection tray 71 by the paper ejection conveyance unit 50 which is rocked and held at the paper ejection position HP2.
The second sheet of double-sided printed paper 42b for "printing"
Since the operation of the paper discharge transport unit 50 to the paper discharge tray 71 is similar to the “printing” printing operation of the image of the document B, the description thereof will be omitted.

Next, when the operator confirms the double-sided printed paper 42b for "plate printing" discharged / stacked on the second paper discharge tray 71 and the result is OK, the print start key ( Press (not shown). It should be noted that the input of the number of printed sheets is unnecessary because the number of printed sheets in the case of the one-sided printing process of the document B is directly displayed on the display unit of the operation panel (not shown).

Thus, the image of the original A is printed on the double-sided printed sheet 4
When the “printing” printing formed on 2b is completed and the printing is completed, the printing process of the image of the second paper feeding unit 9 and the original A (hereinafter, referred to as “double-sided printing process”) becomes possible. In this stencil plate making / printing apparatus, the operation is suspended for a predetermined time in accordance with the data previously input to the memory of the control unit (not shown), and a certain waiting time is taken. Due to this constant waiting time, the ink of the print image of the single-sided printed paper 42f stacked on the first paper discharge tray 61 has sufficiently penetrated into the fibers and the like of the paper to be dried and so-called set. Therefore, there is an advantage that the printed image is not rubbed when the single-side printed sheet 42f is separated / fed by the second sheet feeder 9. Usually this pause is 4
It is set to 5 minutes to 5 minutes, and about that time is substantially sufficient to bring the so-called set okay state.

After a certain waiting time, the double-sided printing process is started. In the double-sided printing process, the steps of feeding, printing, and discharging are repeatedly performed by the set number of prints in the same process as the “plate-making” printing of the image of the original A, and the double-sided printed paper 42b is By being conveyed by the same operation as the above-described operation of the sheet discharge / conveyance unit 50, the sheets are sequentially discharged and stacked on the second sheet discharge tray 71.

In the second paper feed section 9 in the double-sided printing process, the single-side printed paper 42f on the first paper ejection tray 61 is printed.
In the paper feeding, the top dead center detection sensor 94 always detects the upper surface position of the single-side printed sheet 42f during the paper feeding, and this detection signal is output to the control unit (not shown), and the lifting mechanism 140 is instructed by the control unit. By gradually raising, the position of the upper surface of the paper is kept constant.

In the case of single-sided printing in which an image is formed only on one side of the paper 42, the printed paper is sequentially discharged and stacked on the second discharge tray 71.

[0066]

As described above, according to the first aspect of the present invention, with the above-described configuration, it is possible to automatically perform double-sided printing on one side of a sheet and the remaining one side thereof, which is troublesome for the operator. There is no need to perform operations such as paper alignment and paper reset, and the hands of the operator are not contaminated with image ink. Further, since the single-side printed sheet and the double-side printed sheet immediately after printing are conveyed without rubbing the respective image sides by the sheet discharge conveying means, rubbing stains on the image of the printed matter do not occur.

According to the second aspect of the invention, the plate-making sheet and the test printing sheet fed immediately after the plate making are discharged to the second sheet discharge tray arranged above the first sheet discharge tray. As a result, it is easy to check the image, and it is possible to prevent erroneous confusion between the regular printed material and the incomplete printed material that are automatically printed on both sides.

According to the third aspect of the present invention, by providing a slight waiting time, the one-side printed image of the one-side printed sheet is dried and so-called set at the time of the remaining one-side printing of the one-side printed sheet. As a result, when the sheet is fed to the printing unit in the second paper feeding unit, rubbing and smearing of the image of the one-sided printing of the one-sided printed sheet can be prevented and a clean image can be obtained.

According to the invention described in claim 4, the first guide tray is moved toward the second sheet feeding section by the movement guide means of the discharge tray moving means, and the discharge tray moving means is shaken. Since the first guide tray is swung toward the second sheet feed section by the movement guide means with the movement guide means itself as one swing fulcrum, the mechanism of the double-sided printing process is simplified. can do.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a stencil type plate making and printing apparatus to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged side view of an essential part showing the configuration of a first paper ejection tray and a paper ejection tray moving means, showing a state in which the first paper ejection tray occupies a first position.

FIG. 3 is an enlarged side view of an essential part showing the configuration of a first paper ejection tray and a paper ejection tray moving means, showing a state in which the first paper ejection tray occupies a second position.

FIG. 4 is an enlarged perspective view of a main part showing a configuration of a paper discharge transport unit and a transport path switching unit.

5 is a flowchart showing an operation sequence of the stencil-type plate-making printing apparatus of FIG.

FIG. 6 is a flowchart showing an operational sequence of the stencil plate making and printing apparatus of FIG.

[Explanation of symbols]

 P1 First position P2 Second position HP1 First paper discharging position HP2 Second paper discharging position 2 Plate making unit 3 Plate feeding unit 4 First paper feeding unit 8 Plate discharging unit 9 Second paper feeding unit 10 Printing Part 21 Heat-sensitive stencil master 21A Plate-made master 21B in which the image of the original B is perforated and plate-made Master plate 23 in which the image of the original A is perforated and plate-made 23 Thermal head as plate making means 42 Printing drum 42 Paper before printing 42f Single-sided printed paper 42b on which the image of B is printed 42b Double-sided printed paper on which the image of the original A is printed 50 Paper discharge transport unit as a paper discharge transport unit 61 First paper discharge tray 71 Second paper discharge tray 100 Discharge tray moving means 120 Conveyance path switching means 130 Horizontal moving mechanism as movement guide means 140 Elevating mechanism as swing guide means 1000 Stencil-type plate-making printing device capable of double-sided printing

Claims (4)

[Claims] 1. A plate making section for perforating a master for heat-sensitive stencil by a plate making means, a plate feeding section for conveying a plate made master made by the plate making section and winding it on a printing drum, and a printing drum from the printing drum. A stencil type having a plate discharge section for peeling and containing the used master, and a printing section for supplying ink from the inner peripheral side of the printing drum to transfer the ink from the holes of the plate-made master to the printing paper. In a plate-making printing apparatus, a sheet before printing is stacked, a first sheet feeding section for separating the sheets one by one and feeding them toward the printing section, and a single-sided printed sheet printed by the printing section. A first position movable between a first position for discharging and stacking sheets and a second position for feeding the remaining one side of the one-side printed sheet for printing by the printing unit. The output tray and the above A second paper ejection tray for ejecting and stacking double-sided printed paper printed by the printing unit, and the first paper ejection tray when the first paper ejection tray occupies the second position A second paper feed unit that separates the above single-sided printed sheets one by one and feeds them toward the printing unit, and a first paper ejection tray at a first position and a second position. The double-sided printing is performed on a first discharge tray that is connected to the discharge tray moving unit that selectively moves and the single-side printed sheet discharged from the printing unit and occupies the first position. Rocking between a first paper ejection position to the first paper ejection tray and a second paper ejection position to the second paper ejection tray for transporting the finished paper to the second paper ejection tray, respectively. Movable sheet discharge conveying means, and conveying path switching means for selectively moving the sheet discharge conveying means to a first sheet discharging position and a second sheet discharging position. It sided printable stencil type plate-making printing machine, characterized in that it comprises. 2. A first paper ejection tray is arranged below the second paper ejection tray, and the printing paper and the test printing paper fed immediately after plate making are ejected to the second paper ejection tray. The stencil-type plate-making printing apparatus capable of performing double-sided printing according to claim 1. 3. A pause time until the single-side printed sheet is separated / fed by the second sheet feeding unit after the stacking of the single-side printed sheet on the first discharge tray is completed. 3. A single waiting time is set to be longer than the plate making time of the master for the remaining single-sided printing of the single-sided printed paper, and a slight waiting time is provided. A stencil-making plate making machine that can print on both sides. 4. The paper discharge tray moving means uses the movement guide means for moving the first paper discharge tray toward the second paper feed section and the movement guide means itself as one swing fulcrum. 2. A swing guide unit for swinging the first paper discharge tray toward the second paper feed unit.
A stencil-type plate-making printing apparatus capable of double-sided printing according to item 2 or 3.