JPH10291357A - Perfecting press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize automatic perfecting without staining the surface of a sheet by providing a tray for discharging sheets printed on one or both sides, and an inverter for printing on the remaining side and winding another master around a print drum at a plate feed section after a printed master is discharged. SOLUTION: A plate making press 1000 comprises a sheet feed section 4 for stripping a printed master 21 from a print drum 31 and winding a master 21 made at a plate making section 2 around a print drum 31 before feeding an unprinted sheet 42 to a print section 10, a sheet discharge section 7 comprising a sheet discharge tray 61 for moving a sheet 42f printed on one side between a sheet discharging/stacking position and a position for printing on the remaining side, a sheet discharge section 6 for moving the sheet discharge tray 61 selectively by a moving means and a sheet discharge tray 71 for discharging/stacking a perfected sheet 42b, a unit 50 for carrying the sheets 42f, 42b to respective sheet discharge trays 67, 71, and a carrying route switching means for inverting the sheet 42f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly, to a plate-making printing apparatus capable of printing images on both sides of a printing paper automatically.

[0002]

2. Description of the Related Art Heretofore, a stencil master for which stencil printing has been completed is wound around the outer peripheral surface of a printing drum, and an image is formed on the printing drum by pressing the printing paper against the printing drum with a press roller. Stencil printing machines of the type are well known.

Recently, double-sided printing tends to increase for reasons such as saving paper and preventing an increase in file storage space, and 70 to 80% of users who actually use a stencil printing apparatus in the market. Performs double-sided printing. When performing double-sided printing using such a stencil printing apparatus, first perform single-sided printing, then realign the edges of the single-sided printed paper neatly, and place the single-sided printed paper in the feed tray of the stencil printing apparatus. Is set upside down so that the side of the paper is on the back side, and then printing is performed on the remaining one side. As automatic double-sided printing in a stencil printing apparatus, Japanese Patent Application No. Hei 4-232283 describes
A technology that enables simultaneous two-sided printing with two printing drums has already been proposed.

On the other hand, in a plain paper (PPC) copying machine, an apparatus for automatic double-sided copying has already been put to practical use and is generally used. Examples of the automatic duplex copying apparatus are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 64-3647 and 64-8162. As a means for causing this, a method of pressing the copied paper with a pair of rollers or rollers is employed.

[0005]

However, according to the conventional manual operation, the sheets stacked on the sheet discharge tray are not properly aligned. Setting is generally a difficult and cumbersome task for the operator. In addition, the hand can be stained with the ink of the printed image when aligning it by hand, or it can be seen in which direction when setting it in the paper feed tray, the front and back sides will be printed correctly. There is a problem that it is difficult.

[0006] In the technique capable of simultaneous double-sided printing with two printing drums, there are problems that the size of the apparatus is increased due to having two printing drums, and that the structure is complicated and the cost is increased.

On the other hand, when the above technology 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 due to drying of the ink. In the case of the system in which the rollers are pressed and conveyed, there is a problem that roller trace stains occur on the image surface. Also, in the case of a stencil printing machine, since the number of prints made from one document is large, an automatic double-sided intermediate tray having a small sheet storage capacity like a copier is not sufficient. There is also a problem that the method of pressing the image surface with a roller and aligning the image surface to one side for alignment cannot be adopted because roller trace stains appear.

[0008] Therefore, the present invention solves the above problems without the need for an operator's hand.
It is an object of the present invention to provide a new printing apparatus capable of automatically performing double-sided printing on the front and back sides of paper.

[0009]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a plate making section for perforating a master for heat sensitive stencil by plate making means, and a plate making section made by the plate making section. Plate-making apparatus having a plate feeding section for conveying a finished master and winding it around a printing drum, and a printing section for transferring ink from a perforated portion of the plate-making master wound around the printing drum to printing paper. And a first paper supply unit for stacking the paper before printing, separating the paper one by one, and feeding the paper toward the printing unit, and discharging the single-sided printed paper printed by the printing unit. A first paper output tray movable between a first position for paper / stacking and a second position for feeding on the other side of the single-side printed paper for printing by the printing unit; And on the other side of the one-side printed paper, A second discharge tray for discharging and stacking the printed double-sided printed paper, and a first discharge tray occupying a second position when the first discharge tray occupies a second position. A second paper supply unit that separates single-sided printed paper one by one and feeds the paper to the printing unit, and a first paper output tray is selectively moved to a first position and a second position. A paper ejection tray moving means for moving, and a first side occupied by the printing unit and occupying the first position on the single-sided printed paper discharged from the printing unit;
The first discharge position to the first discharge tray and the second discharge position to the second discharge tray for transporting the double-sided printed paper to the second discharge tray A sheet discharging and conveying means capable of swinging between the sheet discharging position and a conveying path switching means for selectively moving the sheet discharging and conveying means between a first sheet discharging position and a second sheet discharging position. Is provided.

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

According to the third aspect of the present invention, the first or second aspect is provided.
In the invention described in the above, after the loading of the single-sided printed paper on the first paper output tray is completed, the pause time until the single-sided printed paper is separated and fed by the second paper feeding unit is defined as: A longer waiting time is set by setting the time longer than the master making time of the master for the remaining single-sided printing of the single-sided printed paper.

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

[0013]

According to the first aspect of the present invention, in the single-sided printing step, the paper before printing is fed from the first paper supply unit to the printing unit and printed on one side of the paper. Then, the paper discharge transporting means is moved to the first paper discharge position by the transport path switching means, whereby the paper is discharged and stacked on 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 faces the second paper supply unit. In the double-sided printing step, the single-sided printed paper is fed from the second paper supply unit to the printing unit and printed on the remaining single-sided printed single-sided paper. The double-sided printed paper is discharged and stacked on the second paper discharge tray by the paper discharge conveyance means being swung to the second paper discharge position by the conveyance path switching means. Further, the single-sided printed paper and the double-sided printed paper immediately after printing are transported by the paper discharging transporting means without rubbing each image surface.

According to the second aspect of the present invention, the printing paper or test printing paper fed immediately after the plate making is discharged to the second paper discharge tray disposed above the first paper discharge tray. You.

According to the third aspect of the present invention, after the loading of the single-sided printed sheets on the first discharge tray is completed, the single-sided printed sheets are separated and fed by the second sheet feeding unit. By setting the pause time to be longer than the master making time for the remaining one-sided printed master for single-sided printing, and providing a slight waiting time, the remaining one-sided printed When the single-sided printing is performed, the single-sided printed image of the single-sided printed paper is in a dry state. Therefore, when the single-sided printed image is fed to the printing unit in the second paper feeding unit, the single-sided printed image of the single-sided printed paper is rubbed. Absent.

According to the fourth aspect of the present invention, the first discharge tray is moved toward the second paper feed unit by the movement guide means of the discharge tray moving means, and the discharge tray moving means swings. The first paper discharge tray is swung toward the second paper feed unit by the movement guide means using the movement guide means itself as one swing fulcrum.

[0017]

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

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

In FIG. 1, reference numeral 1000 denotes a stencil type stencil printing apparatus capable of printing on both sides. The stencil type stencil printing machine 1000 capable of double-sided printing includes an original reading section 1 for reading images on the front surfaces of the originals A and B transferred from an original receiving table 1a arranged above the body section 500, and the original reading section 1. Part 1
The master 2 for heat-sensitive stencil is arranged by the thermal head 23 as a stencil making means arranged on one side of the body part 500 below the
1, a plate making section 2 for making a perforated plate making, a plate feeding section 3 for conveying a plate-made master made by the plate making section 2 and winding it around a printing drum 31, and a body section 500 at the lower left of the document reading section 1. Ink is supplied from the plate discharging section 8 disposed on one side of the printing drum 31 for separating and storing the used master from the printing drum 31 and the inner peripheral side of the printing drum 31 disposed substantially at the center of the body section 500. The printing unit 10 that transfers ink from the holes of the master plate master to the printing paper 42, and the paper 42 that is disposed below the plate making unit 2 and that is not printed, is loaded, and the printing unit 42 separates the paper 42 one by one. First paper feed unit 4 for feeding paper toward 10
And the first position P1 where the single-sided printed paper 42f printed by the printing unit 10 is to be discharged and stacked and the remaining one side of the single-sided printed paper 42f The first discharge tray 61 and the first discharge tray 61 that can be moved between a second position P2 to be fed to be printed by the printing unit 10 and the first discharge tray 61 are moved from the first position P1 to the second position P2. Tray moving means 100 for selectively moving to the position P2
2 and 3 for discharging and stacking a double-sided printed sheet 42b printed by the printing unit 10 on the remaining one side of the single-sided printed sheet 42f. Second
When the first paper discharge tray 61 occupies the second position P2 and the second paper discharge section 7 having the paper discharge tray 71, the single-sided printed paper 42f on the first paper discharge tray 61 is reduced by one. A second paper feed unit 9 that separates and feeds the paper toward the printing unit 10 and a single-side printed sheet 42f that is connected to the printing unit 10 and discharged from the printing unit 10 occupy the first position P1. The first discharge tray 61 for transporting the double-sided printed paper 42b to the second discharge tray 71, respectively, to the first discharge tray 67.
Delivery unit 50 as a delivery mechanism capable of swinging between a first delivery position HP1 to the second delivery tray HP2 and a second delivery position HP2 to the second delivery tray 71, and delivery The unit 50 is connected to the first discharge position HP1 and the second discharge position HP2.
4 (see FIG. 4).
), And a paper discharge transport section having a separation claw 39 movable between a separation position close to the outer periphery of the print drum 31 and a non-separation position separated from the print drum 31 to separate printed paper from the print drum 31. 5 is provided.

Hereinafter, the above-described 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 61 are described. The configurations of the paper tray 71, the second paper supply unit 9, the paper discharge tray moving means 100, the paper discharge transport unit 50, and the transport path switching means 120 will be described.

In FIG. 1, an original reading unit 1 sets an ADF (not shown) when a plurality of originals are set on an original receiving table 1a.
(Automatic document feeder) optically reads a document image by a reading unit (not shown) while sequentially conveying
An image sensor (not shown) such as a CD (Charge Coupled Device) can convert the signal into an electric signal and output the electric signal to the plate making unit 2. The document reading unit 1 is, for example, disclosed in Japanese Patent Application No. 4-35.
Since it has the same configuration as that of No. 217, the detailed description of the configuration is omitted.

The plate making section 2 is a roll-shaped heat-sensitive stencil formed of a thermoplastic resin film and a porous flexible support (both not shown) supported so as to be able to be fed out to a side plate (not shown) of the body section 500. Master 21 and a thermal head 23 for perforating and making a master 21 based on image information of a document
And a platen roller 22 that conveys the master 21 to the downstream side of the master conveyance 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 based on image information of a document sent from the document reading unit 1 to selectively a thermoplastic resin film portion (not shown). It has a well-known configuration and function for heat piercing. The platen roller 22 is connected to the body 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 transport path, and is provided with a cutter 25 for cutting the plate-making master 21a to a predetermined length, and is disposed on the downstream side of the master transport path of the cutter 25. A guide plate (not shown) for guiding the leading end of the master 21a to the clamper 32 (described later) and a stepping motor (not shown) for transporting the master 21a to the clamper 32 (described later). And a pair of transport rollers 24a and 24b that are driven to rotate.

The plate discharging section 8 presses a used master (not shown) on the printing drum 31 to use the used master (not shown).
And a pair of pressure-contact peeling rollers 8 that peel off in synchronization with the rotation of the printing drum 31 and are discarded into a plate discharge storage box 83 (described later).
1, 82 and a plate discharge storage box 83 for storing used masters (not shown). Peeling roller pair 8
1, 82 are driven to rotate by a motor (not shown).

The printing unit 10 has a plate-making master 21 on its outer peripheral surface.
a, a printing drum 31 wound around a rotation center axis 34, ink supply means 35 for supplying ink to the inner peripheral surface of the printing drum 31, and plate making provided on the outer peripheral surface of the printing drum 31. A clamper 32 for holding the leading end of the finished master 21a, and a press roller 33 provided near the outer peripheral surface of the printing drum 31 and pressing a sheet (not shown) against the outer peripheral surface of the printing drum 31. It is configured.

The printing drum 31 has a structure in which a mesh screen (both not shown) is wound around the outer peripheral surface of a support cylinder having a large number of apertures, and rotates around a rotation center axis 34. It is freely supported. The printing drum 31 is driven to rotate clockwise and counterclockwise by a motor (not shown). The clamper 32 is opened and closed at a predetermined position by opening and 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 rotated in synchronization with the printing drum 31 in the direction of arrow A in the figure. 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 with the ink roller 36, and serves as the rotation center shaft 34 and serves as the ink reservoir 37. And an ink pipe shaft 34 for supplying the ink to the ink pipe.

At a lower position facing the ink roller 36, a press roller 33 is disposed so as to be able to come in contact with and separate from the print drum 31, and the press roller 33 is attached to the print drum 31 by a mechanism having 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
The paper (not shown) is continuously pressed against the printing drum 31 while being driven and rotated.

The first paper supply unit 4 is provided with a paper supply table 41 for stacking papers 42 before printing, and a feeder for feeding the papers 42 between the printing drum 31 and the press rollers 33 at a predetermined timing. The sheet 42 is disposed downstream of the sheet transport path between the roller pair 45a, 45b and the feed roller pair 45a, 45b, and passes between the print drum 31 and the press roller 33.
A guide plate 47 for guiding the paper and a paper feed roller 43 for distributing the paper by contacting the uppermost paper 42 on the paper feed table 41.
And the sheet 42 disposed downstream of the sheet feeding roller 43.
Double feed prevention mechanism 14 that separates and feeds paper one by one
4, a pair of feed rollers 45a, 45b,
It mainly comprises a guide plate 48 for guiding the paper 42 to 45b. Note that the sheet 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 the structure shown in Japanese Patent Application No. 4-103077, and a detailed description thereof will be omitted to avoid duplication. The lower curved surface of the guide plate 48 in the drawing also serves as a guide plate 97o of a reversing conveyance path 99 described later.

As shown in FIGS. 2 and 3, the first discharge tray 61 is formed integrally with a discharge tray 61b for loading and storing the single-sided printed paper 42f and one end of the discharge tray 61b. An end fence 67 for aligning one end of the single-sided printed sheet 42f, a plurality of rollers 62 rotatably provided on both sides of the sheet discharge table 61b, and movable in the direction of both sides of the sheet discharge table 61b. Single-sided printed paper 4 provided and stacked in
A pair of side guides 66 for aligning both side edges of 2f
a and 66b. At a substantially central portion of the paper discharge tray 61b, a connection fixing portion 61a fixed to a chain 64 (described later) projects outside of both side edges of the paper discharge tray 61b (in a direction perpendicular to the plane of the drawing) and is offset. The connection fixing portion 61 a is provided with a chain 64.
(Described later).

As shown in FIGS. 2 and 3, the discharge tray moving means 100 includes a horizontal moving mechanism 1 as a moving guide means.
30 and an elevating mechanism 140 as swing guide means. The horizontal moving mechanism 130 includes a horizontal rolling surface 63f formed substantially horizontally on the second position P2 side and a second position P from the first position P1 for rolling the plurality of rollers 62.
A guide rail 63 having an inclined rolling surface 63r ascending toward 2 and a first discharge tray 61 are fixed by a connection fixing portion 61a, and are rotatably supported by the guide rail 63. For moving the first discharge tray 61 between the first position P1 and the second position P2 which is wound around the sprockets 70a, 70b and 70c thus set.
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,
The chain 70c and the chain 64 are arranged side by side on both sides of the paper discharge tray 61b, and these guide rails 63 are integrally connected by a connecting portion (not shown). Sprocket 70
a is rotatably supported by the other end of the guide rail 63. The sprocket 70b has a horizontal rolling surface 63f.
At a substantially boundary between the and the inclined rolling surface 63r, it is rotatably supported by a fulcrum shaft 101 as one swing fulcrum fixed to a side plate (not shown) of the body portion.

The elevating mechanism 140 has a rack 103 formed at one end of the guide rail 63 so as to extend downward in a substantially fan shape, and a pinion fixedly mounted on a side plate (not shown) of a body portion near the rack 103 and engaged with the rack 103. It mainly comprises a lifting drive motor 102 having a 104 and a fulcrum shaft 101 which supports the guide rail 63 so as to swing.

1 to 3, the second paper feed unit 9 is provided with a first paper discharge tray 61 loaded with the single-sided printed paper 42f and moved to the second position P2, a printing drum 31, and a press. A pair of feed rollers 45a and 45b for feeding a single-sided printed sheet 42f at a predetermined timing between the feed rollers 45a and 45b.
And a guide plate 47 disposed downstream of the sheet transport path of the pair of feed rollers 45a and 45b for guiding the single-side printed sheet 42f between the printing drum 31 and the press roller 33.
A second paper feed roller 91 that contacts the top of the single-sided printed paper 42f on the first paper output tray 61 and distributes the paper, and is disposed downstream of the second paper feed roller 91, A paper double feed prevention mechanism 145 that sequentially separates and feeds the printed paper 42f one by one, and a feed roller pair 4 that is disposed between the feed roller pairs 45a and 45b and the paper double feed prevention mechanism 145.
A reversing conveyance path 99 for guiding the single-side printed sheet 42f to 5a and 45b, a butting plate 68 fixed to a side plate (not shown) of the body portion for abutting and aligning one end of the single-side printed sheet 42f; A sensor 69 provided on one side wall of the abutting plate 68 to detect the abutting state of one end of the single-sided printed sheet 42f against the abutting plate 68, and a first paper output tray 61 fixedly mounted on a side plate (not shown) of the body section. And a top dead center detection sensor 94 for detecting the uppermost top dead center position of the single-side printed paper 42f loaded and stored in the printer.

The reversing conveyance path 99 has a substantially U-shape, and is provided with a guide plate 96 disposed on the side of the sheet double feed prevention mechanism 145.
o, 96i, guide plates 97o, 97i disposed on the side of the feed roller pair 45a, 45b, and a single-sided printed sheet 42f disposed between these guide plates.
A pair of intermediate transport rollers 93a, 9 for transporting to 5a, 45b
3b.

The paper 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. For example, the structure is the same as that shown in Japanese Patent Application No. 4-1030077. , And a detailed description thereof will be omitted to avoid duplication. As the sensors 69 and 94, for example, limit switches are used.

In FIG. 1, the second paper discharge tray 71 is
The body unit 50 above the first paper discharge unit 6 facing the downstream end of the paper discharge transport unit 50 occupying the second paper discharge position HP2.
It is fixed to 0. The second paper output tray 71 is provided with a paper output tray 71b for loading and storing double-sided printed paper 42b, plate-attached paper fed immediately after plate making, and test printing paper, and a paper output tray 7b.
Double-sided printed paper 42 integrally formed at one end of 1b
b, and a pair of side guides 74a, 74b for aligning both side edges of the double-sided printed paper 42b, which is provided movably in the direction of both sides of the paper discharge tray 71b and is stacked. It is mainly composed of

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

The transport path switching means 120 includes a pair of side plates 5
Racks 58a, 58b provided on 9a, 59b, and pinions 57a meshing with both racks 58a, 58b,
57b, a shaft 56 connecting the pinions 57a and 57b on both sides, a worm wheel 121 provided on the shaft 56, and a worm 122 meshing with the worm wheel 121. Racks 58a, 58b
Is formed in a fan shape centered on the drive shaft 52s.
A bracket 51B is fixed to a lower portion of the housing lower member 51d, and a shaft 56 is rotatably supported at both ends of the bracket 51B. First of the paper discharge transport unit 50
Of the stencil sheet to the paper discharge position HP1 and the second paper discharge position HP2, a signal sent from a control unit (not shown) of the stencil type stencil printing apparatus is input to control means (not shown). Is input to a motor (not shown) connected to the worm 122.

Normally, the discharge / conveyance unit 50 is oscillated and held by the conveyance path switching means 120 so as to occupy the second discharge position HP2. (“Printing”, “test printing”, and printed material on both sides) that will be described later.

Next, the operation of the stencil printing machine will be described with reference to the flowcharts of FIGS. In FIG. 1, for example, two documents A and B are set on a document receiving table 1a of the document reading unit 1. The operator makes a prepress key on the operation panel (not shown)
When is pressed, only the second document B is first sent to a reading unit (not shown), and an image is read. 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 is 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 digitally converted image information of the document B is sequentially transmitted to the plate making unit 2.

The plate making section 2 performs a plate making and plate feeding process based on digitalized image information of the document B substantially in parallel with the image reading operation of the document B. That is, the rolled master 21 is conveyed while being fed out by the platen roller 22 being rotated in the direction of arrow A while pressing the master 21 against the thermal head 23.
With respect to the master 21 conveyed in this manner, the thermal head 23 causes the plurality of heating elements to selectively generate heat based on image information of the document B from the document reading unit 1, and the master 21
Perforate plate making.

The plate-making master 21A (indicated by parentheses in FIG. 1) on which the image of the document B has been perforated is printed by the printing drum 31 by the pair of conveying rollers 24a and 24b of the plate feeding section 3.
Of the printing drum 31 at the plate feeding position, and is conveyed toward the expanded clamper 32 of the printing drum 31 at the plate feeding position.

The leading end of the master 21A is the clamper 3.
When the number reaches 2, the clamper 32 closes at a predetermined timing and clamps the tip. When the leading end of the master 21A is clamped by the clamper 32, the printing drum 31 is intermittently rotated in the direction of arrow A, and the master 21A is wound around the periphery. Then, the plate-making master 21A is cut into a predetermined length by the cutter 25.

When the prepressed master 21A corresponding to one plate of the original B is completely wound around the printing drum 31,
The plate making and plate feeding steps are completed, and a printing step of the image of the document B (hereinafter, referred to as a “single-sided printing step”) is started. In the single-sided printing process, first, the paper 42 on the paper supply table 41 of the first paper supply unit 4 is conveyed by the rotation of the paper supply roller 43 in contact with the uppermost paper 42, and the paper is multi-fed. The sheet is separated one by one by the separation roller 44 of the prevention mechanism 144, and is conveyed toward the pair of feed rollers 45 a and 45 b while being guided by the guide plate 48. The paper 42 is further fed to the printing drum 3 by a pair of feed rollers 45a and 45b.
The sheet is fed to the printing unit 10 while being guided by the guide plate 47 at the same time as the rotation of 1.

When the fed sheet 42 is fed between the printing drum 31 and the press roller 33, the press roller 33 which has been separated below the outer peripheral surface of the printing drum 31 at the same timing as the sheet 42 is fed. Moved upward. When the press roller 33 is pressed through the paper 42 onto the pre-made master 21A wound on the outer peripheral surface of the printing drum 31, the paper 42 is pressed against the pre-made master 21A, and the ink is discharged from the inner peripheral surface of the printing drum 31. Is transferred to the surface of the sheet 42 via the hole of the master 21A, and a print image of the document B is formed.

The image of the original B is read as described above, and the perforated master 2 is perforated and perforated according to the image.
When 1A is wound around the outer circumference of the printing drum 31, the first sheet is printed. In the case of the stencil printing machine, the first printed matter immediately after the stencil winding is called "printing" printing and is excluded from the official printed matter for confirming the printed image. In addition, one or two sheets may be printed in order to confirm the position of the print image, which is referred to as “test printing” printing, and this is also excluded from the official printed matter.

The single-sided printed sheet 42f for “plate imprinting” on which the image of the document B is formed is separated from the printing drum 31 by the separation claw 39 moved to the separation position, and is conveyed by the conveyance path switching means 120. The second discharge tray 71 is moved by the discharge conveyance unit 50 oscillated and held at the second discharge position HP2.
The paper is discharged and stacked. That is, one single-sided printed sheet 42f for “plate attaching” is conveyed to the second paper output tray 71 by the endless belt 54 of the paper output conveyance unit 50,
The so-called "printing" printing is completed. At this time, the single-sided printed sheet 42f is conveyed while being adsorbed on the surface of the endless belt 54 by the air suction fan 55 sucking the air in the sheet discharging and conveying unit 50 downward from the opening 54a of the endless belt 54. Is done.

Next, when the operator confirms the single-sided printed sheet 42f for "printing" discharged / stacked on the second discharge tray 71 and becomes ok, a ten-key (see FIG. ) To set the number of prints, press an automatic double-sided key (not shown), and then press a print start key (not shown). Then, in the same process as the above-mentioned "plate printing" printing, each process of feeding, printing, and discharging is repeatedly performed by the set number of printed sheets. The switching means 120 swings from the second paper discharge position HP2 to the first paper discharge position HP1, and the single-sided printed sheet 42f is transported by the same operation as the above-described operation of the paper discharge transport unit 50. First
Are sequentially discharged and stacked on the discharge tray 61 with the print image side up. At this time, the switching operation from the second paper discharge position HP2 to the first paper discharge position HP1 of the paper discharge transport unit 50 by the transport path switching means 120 is performed as follows. That is, the 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, 57b are sequentially rotated to discharge the paper. The unit 50 is moved along the racks 58a and 58b around the drive shaft 52s to the first paper discharge position HP1.
Rocked to

When the printing of the single-sided printed sheet 42f on which the image of the document B is formed is completed, a plate discharging process by the operation of the plate discharging unit 8 is executed. First, the printing drum 31 rotates in the counterclockwise direction, and the rear end of the used master (not shown) on which the image of the document B on the outer peripheral surface of the printing drum 31 is perforated and made to approach the separation rollers 81 and 82. While the rollers 81 and 82 are rotating in the direction of the arrow in the figure, one of the peeling rollers 81 scoops up the rear end of the used master (not shown), and the used master (not shown) At 82, the sheet is conveyed while being peeled off in synchronization with the rotation of the printing drum 31, pushed into the plate discharge storage box 83, and discharged.

In this way, when the used master (not shown) on which the image of the original B has been punched and made is peeled off from the outer peripheral surface of the printing drum 31 and the plate discharging process is completed, the original reading unit 1 Is sent to a reading unit (not shown). That is, similarly to the image reading operation of the document B, the image of the document A is optically read by a reading unit (not shown) while being conveyed by an ADF (automatic document feeder) (not shown), and the image is read by an image sensor (see FIG. (Not shown).
The photoelectrically converted electric signal is supplied to an analog / not shown
The image information of the document A, which is input to a digital (A / D) conversion board and converted into a digital signal, is sequentially transmitted to the plate making unit 2.

In the plate making section 2, 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 on the basis of the digitalized image information of the document A, similarly to the plate making process of the document B. Done. The master 21 in the roll state
Platen roller 22 transfers master 21 to thermal head 23
By rotating in the direction of arrow A while pressing against
It is conveyed while being fed out. With respect to the master 21 conveyed in this manner, the thermal head 23
The plurality of heating elements selectively generate heat based on the image information of the document A from the printer 21 to perform perforation and plate making on the master 21.

The plate-making master 21B (indicated by parentheses in FIG. 1) on which the image of the document A is perforated is printed by the printing drum 31 by the pair of conveying rollers 24a and 24b of the plate feeding section 3.
Of the printing drum 31 at the plate feeding position, and is conveyed toward the expanded clamper 32 of the printing drum 31 at the plate feeding position.

The leading end of the master 21B is the clamper 3.
When the number reaches 2, the clamper 32 closes at a predetermined timing and clamps the tip. When the leading end of the master 21B is clamped by the clamper 32, the printing drum 31 is intermittently rotated in the direction of arrow A and the master 21B is wound around the master 21B. Then, the plate-making master 21B is cut into a predetermined length by the cutter 25.

On the other hand, the original A having undergone the single-sided printing process
In parallel with the plate making process, the transfer path switching means 120 swings the paper discharge transport unit 50 from the first paper discharge position HP1 to the second paper discharge position HP2, and the paper discharge tray moving means 100 moves The operation of moving one sheet discharge tray 61 from the first position P1 to the second position P2 is performed.

That is, from the first paper discharge position HP1 of the paper discharge transport unit 50 by the transport path switching means 120, the second
Is switched in the reverse direction to that in the single-sided printing process, and the motor (not shown) of the transport path switching means 120 is rotated in the reverse direction to rotate the worm 1.
The worm wheel 121 meshing with the worm 122, the shaft 56, the pinion 57
A and 57b rotate sequentially, and the paper discharge transport unit 50 is swung about the drive shaft 52s along the racks 58a and 58b to the second paper discharge position HP2.

On the other hand, the first discharge tray 61 is moved from the first position P1 to the second position P by the discharge tray moving means 100.
The movement operation to 2 is performed as follows. That is,
1 or 2, first, the horizontal drive motor 65 of the horizontal movement mechanism 130 is driven to rotate in the direction of arrow A, and the chain 64 is conveyed in the direction of arrow X. Rolls on the inclined rolling surface 63r and the horizontal rolling surface 63f on the guide rail 63, and when one end of the single-side printed paper 42f stacked on the first 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. Thus, the first paper discharge tray 61 is moved to the position shown in FIG.

Next, in FIG. 3, the lifting drive motor 102 of the lifting mechanism 140 is rotated in the direction of arrow B to rotate the pinion 104 meshing with the rack 103. The fulcrum shaft 10 with the tray 61 and the horizontal drive motor 65 mounted thereon
It is rocked upward with 1 as the rocking center. And
When the top dead center position of the single-side printed sheet 42f is detected by the top dead center detection sensor 94, the lifting drive motor 10
2 is stopped, and the first discharge tray 61 occupies the second position P2.

Next, "printing" printing and "test printing" printing of the image of the document A are performed in the same manner as in the single-sided printing process. First, the single-sided printed sheet 42f on the first sheet ejection tray 61 occupying the second position P2 is
Is rotated by abutting on the uppermost single-sided printed sheet 42f and rotating.
The sheet is separated one by one at the part of the separation roller 92, and the guide plate 96
o, 96i while being guided by the intermediate conveying rollers 93a, 9
3b, and further guided by guide plates 97o and 97i, and further conveyed toward a pair of feed rollers 45a and 45b. In this way, the single-sided printed sheet 42f for “plate imposition” has its image surface of the original B turned upside down in the reversing conveyance path 99, and is further fed with a pair of feed rollers 45a, 45a.
5b, the print drum 31 is fed to the printing unit 10 while being guided by the guide plate 47 in synchronization with the rotation of the print drum 31.

When one sheet of single-sided printed paper 42f for “printing” is fed between the printing drum 31 and the press roller 33, the outer peripheral surface of the printing drum 31 is lowered in time. Press roller 33 that was separated
Is moved upward. When 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 single-sided printed sheet 42f is pressed against the plate-making master 21B, and the ink is transferred from the inner peripheral surface of the printing drum 31 to the remaining surface of the single-sided printed sheet 42f through the hole of the plate-making master 21B. Then, the image of the document A is formed to be the double-sided printed paper 42b.

One double-sided printed sheet 42 for “printing”
b is the separation claw 39 moved to the separation position and the printing drum 3
1 and separated by the transfer path switching means 120
The paper is conveyed and stacked on the second paper discharge tray 71 by the paper discharge conveyance unit 50 which is rocked and held at the paper discharge position HP2 of the second paper discharge tray.
The second of the two double-sided printed sheets 42b for "printing"
The operation by the paper discharge transport unit 50 to the paper discharge tray 71 is the same as the “plate printing” printing operation of the image of the document B, and thus the description is omitted.

Next, when the operator confirms the double-sided printed paper 42b for “printing” discharged / stacked on the second discharge tray 71 and is OK, the print start key ( Press (not shown). The input of the number of prints is unnecessary because the number of prints in the single-sided printing process of the document B is displayed on the display unit of the operation panel (not shown).

In this way, the image of the original A is
When the “printing” printing formed in 2b is completed and the printing is completed, the printing process of the image of the second paper feeding unit 9 and the document A (hereinafter, referred to as “double-side printing process”) becomes possible. In the stencil printing machine, the operation is suspended for a predetermined time in accordance with data previously input to a memory of a control unit (not shown), and a certain waiting time is taken. With this fixed waiting time, the ink of the printed image of the single-sided printed paper 42f stacked on the first paper output tray 61 sufficiently penetrates into the fibers and the like of the paper and is dried to form a so-called set state. Thus, there is an advantage that the printed image is not rubbed and stained at the time of the separating / feeding operation of the single-sided printed sheet 42f in the next second sheet feeding section 9. Typically, this pause is 4
The time is set to minutes to 5 minutes, and if it is about that time, it is almost enough to set the so-called set OK state.

After the end of the predetermined waiting time, the double-sided printing process is started. In the double-sided printing process, in the same process as “printing” printing of the image of the document A, each process of feeding, printing, and discharging is repeatedly performed for the set number of printed sheets. The paper is conveyed by the same operation as the above-described operation of the paper discharge conveyance unit 50, and is sequentially discharged and stacked on the second paper discharge tray 71.

In the second paper feed unit 9 in the double-sided printing process, the single-side printed paper 42f on the first paper output tray 61
During the paper feeding, the top dead center detection sensor 94 always detects the upper surface position of the single-sided printed paper 42f during paper feeding, and this detection signal is output to a control unit (not shown), and the elevating mechanism 140 is controlled by a command from the control unit. As the paper is gradually raised, the upper surface position 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 sheet 42, the printed sheet 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, double-sided printing can be automatically performed on one side of a sheet and the other side thereof, so that the operator is troublesome. There is no need to perform paper alignment and paper resetting operations, and the hands of the operator are not stained with the ink of the image. Further, since the single-sided printed paper and the double-sided printed paper immediately after printing are conveyed by the paper discharge conveying means without rubbing each image surface, the image of the printed matter does not smear.

According to the second aspect of the present invention, the printing paper or test printing paper fed immediately after plate making is discharged to the second paper discharge tray disposed above the first paper discharge tray. Therefore, it is easy to confirm the image, and it is possible to prevent a regular printed matter that is automatically printed on both sides and an incomplete printed matter from being mistakenly mixed together.

According to the third aspect of the present invention, by providing a short waiting time, the one-sided printed image of the one-sided printed sheet is dried and the so-called set-up is performed when the remaining one-sided printed sheet is printed. Therefore, when the sheet is fed to the printing unit in the second sheet feeding unit, it is possible to prevent a single-sided printed image of the single-sided printed paper from being rubbed and to obtain a stain-free image.

According to the fourth aspect of the present invention, the first discharge tray is moved toward the second paper feeding section by the movement guide means of the discharge tray moving means, and the discharge tray moving means is swung. Since the first paper ejection tray is swung toward the second paper feed unit by using the movement guide means itself as one swing fulcrum, the mechanism of the duplex printing process is simplified. can do.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view of a main part showing a configuration of a first paper discharge tray and a paper discharge tray moving means, and shows a state where the first paper discharge tray occupies a first position.

FIG. 3 is an enlarged side view of a main part showing a configuration of a first paper discharge tray and a paper discharge tray moving unit, and shows a state where the first paper discharge tray occupies a second position.

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

FIG. 5 is a flowchart showing an operation sequence of the stencil printing machine of FIG. 1;

FIG. 6 is a flowchart showing an operation sequence of the stencil printing machine of FIG. 1;

[Explanation of symbols]

 P1 First position P2 Second position HP1 First paper discharge position HP2 Second paper discharge 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 Master for heat sensitive stencil 21A Pre-printed master 21B in which image of document B is perforated and made 21B Master made in which image of document A is perforated and made 23 Thermal head as plate making means 31 Printing drum 42 Paper before printing 42f Document Single-sided printed paper on which the image of B is printed 42b Double-sided printed paper on which the image of document A is printed 50 Discharge transport unit 61 as a discharge transport unit 61 First discharge tray 71 Second discharge tray 100 Paper discharge tray moving means 120 Transport path switching means 130 Horizontal moving mechanism as moving guide means 140 Elevating mechanism as swinging guide means 1000 Stencil type stencil printing machine capable of double-sided printing

Claims (2)

[Claims] 1. A plate making section for making a master, a plate feeding section for conveying a plate made master made by the plate making section and winding it around a printing drum, and applying ink to the plate made master on the printing drum. A printing unit that supplies and presses printing paper against the plate-making master on the printing drum to perform printing; and a paper feeding unit that loads paper before printing and feeds the paper toward the printing unit. And a discharge tray from which the single-sided printed paper printed by the printing unit is discharged; and the single-sided printing so that the printing unit prints on the remaining one side of the single-sided printed paper on the discharge tray. And a reversing conveyance path for reversing the finished paper, performing printing on one side of the paper with the master made on the printing drum, discharging the master made on the printing drum, and newly printing by the master making section. The pre-mastered master By winding on the print drum by serial and feeding unit, double-sided printing apparatus characterized by printing on the remaining one side of the one-side printed sheet. 2. A waiting time is provided after the discharge of the single-sided printed sheet onto the discharge tray and before the remaining single-sided printed sheet is printed. 1
A double-sided printing apparatus as described in the above.