JPH0632038A - Stencil printing device - Google Patents

Abstract

PURPOSE:To provide a double cylinder type stencil printing device wherein a shape of a conveying path of a printing form does not become complicated and upon satisfaction that the device is superior in maintenance, the device is capable of performing downsizing. CONSTITUTION:Plate cylinders each 3 are arranged in a line at intervals to each other along a slpe tilted vertically at a fixed tilted angle and a shape of a conveying path of a printing form among the plate cylinders 3 each is made into a state of a straight line running along the slope. A photoengraving device 11, plate discharge device 19 and paper feed device 41 are arranged respectively in spaces each on the upper side and lower side of a tilted arranging line of the plate cylinder.

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,
In particular, the present invention relates to a rotary type stencil printing apparatus that performs multicolor printing.

[0002]

2. Description of the Related Art As a rotary type stencil printing machine, a plate cylinder having an ink supply squeegee means inside and driven to rotate around its own rotation center axis, and a position corresponding to a side portion of the plate cylinder. A stencil sheet delivery unit that is arranged and includes a stencil sheet production section for making a stencil sheet and a stencil sheet delivery section for delivering the stencil sheet to the outer peripheral surface of the plate cylinder, and a position corresponding to each side portion of the plate cylinder. And a plate discharge means for removing the stencil sheet wound around the outer peripheral surface of the plate cylinder from the plate cylinder,
A press roller that is arranged to face the outer peripheral surface of the plate cylinder and presses the print paper toward the outer peripheral surface of the plate cylinder, and printing in which the print paper is sent at a predetermined timing between the plate cylinder and the press roller. A fully automatic stencil printing machine with a plate making function of a single plate cylinder, which has a paper feed timing roller means and a paper feed means for feeding printing paper one by one to the printing paper feed timing roller means, is already well known. Has been. This fully automatic stencil printing machine with a plate making function of a single plate cylinder is disclosed in, for example, Japanese Patent Laid-Open No. 59-96983.

[0003]

When performing multicolor printing such as color printing in the stencil printing machine as described above, it is necessary to replace the plate cylinder for each color printing and perform overprinting on printing paper. is there. Since all work such as plate cylinder replacement is done by hand, workability is poor, and registration in printing of each color is necessary. This work is performed well by general users in offices. Difficult to do.

On the other hand, in one stencil printing machine, a plurality of plate cylinders are provided for printing each color, and each plate cylinder prints each color on one sheet of printing paper for automatic conveyance of the printing paper. A multi-body type stencil printing machine, which can be continuously operated, is conceivable. However, in this stencil printing machine, there are a plurality of plate cylinders, and in the case of full color printing, at least three, preferably four. Since each device is provided with a large size, and the platemaking base paper sending means and the plate discharge means are provided for each plate cylinder, the size of the device is further increased. The required downsizing cannot be met.

For downsizing of the multi-cylinder type stencil printing machine, it is conceivable to arrange the plate cylinders in a plurality of rows and columns, but in this case, the form of the conveying path for the printing paper becomes complicated. However, there is a high risk of a paper jam, and the paper jam is a conveyance path in which it is difficult to remove the paper, which causes a problem in maintainability.

The present invention was made by paying attention to the above-mentioned problems in the conventional stencil printing apparatus, and the form of the conveying path for the printing paper is not complicated, and the maintainability is excellent. It is an object of the present invention to provide a multi-cylinder type stencil printing apparatus which can be downsized, in other words, downsized while satisfying the above conditions.

[0007]

According to the present invention, the above-mentioned objects are arranged in a line along an inclined line inclined in the vertical direction with a predetermined inclination angle and are spaced apart from each other, and each has its own rotation center. A plurality of plate cylinders that are driven to rotate about an axis,
A plate making section arranged at a position corresponding to each side portion of the plate cylinder in an area above the slant line for making a stencil sheet, and a stencil sheet sending section for sending the stencil sheet to the outer peripheral surface of the plate cylinder. And a stencil sheet that is mounted around the outer peripheral surface of the plate cylinder at a position corresponding to each lateral portion of the plate cylinder in a region above the inclined line. A plate discharge means for removing from the cylinder, an ink supply squeegee means arranged inside each of the plate cylinders, and a printing paper which is arranged so as to face each outer peripheral surface of the plate cylinder in a region below the inclined line. A press roller for pressing the plate cylinder toward the outer peripheral surface of the plate cylinder, and a printing roller that is arranged between the plate cylinders adjacent to each other and conveys the printing paper between the plate cylinders along the inclined line and one lower plate cylinder. Feed the printing paper between the press roller corresponding to Between the cylinder printing paper conveying means, a printing paper supply timing roller means for feeding the printing paper at a predetermined timing between the uppermost plate cylinder among the plate cylinders and the press roller corresponding thereto, and the inclined line. A paper feeding unit arranged in the lower region to feed the printing paper one by one, and a printing paper arranged in the region below the inclined line and fed from the paper feeding unit to the printing paper feeding timing roller unit It is achieved by a stencil printing machine characterized in that it has a paper feeding and conveying means.

Further, the stencil printing apparatus according to the present invention has, in addition to the above-mentioned configuration, an image reading means for photoelectrically reading an image of a printing original, and an image reading signal from the image reading section to input an image reading signal based on the image reading signal. The plate-making data generating means outputs a plate-making data signal to the plate-making section of the plate-making base paper sending means, and the plate-making part of the plate-making base paper sending means digitally makes a stencil sheet based on the original image data from the plate-making data creating means. Alternatively, the plate making section of the plate making base paper sending means inputs an image reading signal from the image reading section to the document image data from the plate making data creating means, and the color of the original image is based on the image reading signal. Plate making data producing means for disassembling and outputting the plate making data signal of each color to the plate making part of the plate making base paper sending means, Perforating section of detecting means are another feature that is configured to digitally platemaking the stencil sheet in a dot matrix type based on the original image data from the plate making data creation means.

[0009]

According to the above structure, the stencil sheet is made by the plate making section provided for each plate cylinder, and the outer peripheral surface of each plate cylinder corresponding to the stencil sheet made by each plate making section. It is wrapped around and attached. At the time of printing, the printing paper is sent one by one to the paper feeding and conveying device by the paper feeding device, and the printing paper is fed to the printing paper feeding timing roller device by the paper feeding and conveying device. The timing roller means for supplying the printing paper feeds the printing paper between the uppermost plate cylinder and the corresponding press roller at a predetermined timing. The printing paper sent between the uppermost plate cylinder and the corresponding press roller is pressed against the outer peripheral surface of the plate cylinder by the press roller, and at this time, the stencil sheet is already wound around the outer peripheral surface of the plate cylinder. The printed image is formed by the transfer of printing ink. The printing paper is conveyed along the inclined arrangement line of the plate cylinder by the printing paper conveying means between plate cylinders, and the printing paper is sent between the one lower plate cylinder and the corresponding press roller. It is pressed toward the outer peripheral surface of the plate cylinder by the lower plate cylinder and the corresponding press roller, and at this time it is pressed against the stencil paper that is already wrapped around the outer peripheral surface of the plate cylinder, and the printed images are superimposed by the transfer of printing ink. It is printed and then repeated for each plate cylinder.

When the image reading unit and the plate-making data creating unit are provided, the image reading unit photoelectrically reads the image of the printing original, and the plate-making data signal based on the image reading signal is used as the plate-making base paper for each plate cylinder. It is input by the plate making section of the sending means, and based on this, the plate making section of the plate making feed means of each plate cylinder digitally makes a stencil sheet for stencil printing.

Further, the color separation of the original image is performed based on the image reading signal from the image reading unit, and the plate making data signal of each color obtained by this color separation is input to the plate making unit of the plate making base paper sending means of each plate cylinder. On the basis of this, the plate making portion of the plate making sheet feeding means of each plate cylinder digitally makes a stencil sheet for stencil printing of each color in a dot matrix manner.

[0012]

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

1 and 2 show an embodiment of a stencil printing apparatus according to the present invention. In these figures, reference numeral 1 indicates a cabinet of the stencil printing machine. The cabinet 1 has a box shape, and a plurality of cabinets 1 are arranged in a line along a slant line L which is slanted in the vertical direction at a predetermined slant angle, preferably about 60 degrees to the horizontal line. In this case, four plate cylinders 3 are arranged apart from each other.

Each of the plate cylinders 3 is rotatable about its own center axis of rotation and is rotatably driven in the clockwise direction in the figure by a servomotor or the like (not shown). The plate cylinder 3 is made of an ink permeable material such as a porous metal thin plate or a mesh structure. In the illustrated embodiment, the plate cylinder 3 has a D-shaped cross section having a flat portion, and the flat portion is made of a stencil sheet. The head clamp plate 5 is provided, and the stencil sheet is wound around and mounted on the outer peripheral surface.

A squeegee blade 7 for supplying ink is fixedly arranged inside each plate cylinder 3. The squeegee blade 7 is in sliding contact with the inner peripheral surface of the plate cylinder 3 to form an ink reservoir A in a substantially triangular region formed by the inner peripheral surface of the plate drum 3, and the squeegee action causes the ink reservoir A to rotate as the plate cylinder 3 rotates. Printing ink is supplied to the plate cylinder 1.

In this case, the ink reservoir A is a standing V
The shape of the printing ink in the ink reservoir A accumulates in the ink reservoir A due to gravity following the shape of the ink reservoir A, and maintains the shape even when the rotation of the plate cylinder 3 is stopped. The squeegee angle in this case may be about 30 degrees.

When the plate cylinder 3 has a D-shaped cross section, the squeegee blade 7 is driven so as to follow the shape of the inner peripheral surface of the plate cylinder 3 and come into sliding contact therewith. If a detailed description is required regarding the driving of the squeegee blade 7, the Japanese Patent Application No. 3-235130 filed by the same applicant as the applicant of the present application.
Please refer to the specification and drawings of Japanese Patent Application No. 4-22323.

Ink tubes 9 are provided inside each plate cylinder 3.
Although not shown, an ink supply device is provided which sucks the printing ink from the ink tube and quantitatively supplies the printing ink to the ink reservoir A.

The ink tubes 9 of each plate cylinder 3 are yellow, magenta, cyan, and
The printing ink of each color of black may be stored, and the printing ink of each color may be supplied to the ink pool A of each plate cylinder 3.

In the region above the inclined line L, a platemaking base paper feeding unit 11 is provided for each plate cylinder 3 at a position corresponding to a side portion of each plate cylinder 3. Platemaking base paper sending unit 11
Each store a roll R of a heat-sensitive stencil sheet S, and a thermal head 13 for forming a heat-sensitive perforated image on the stencil sheet S by a dot matrix method for digital plate making; The stencil sheet S includes a stencil sheet feeding roller 15 that sends the stencil sheet S to the outer peripheral surface of the plate cylinder 3, and a stencil sheet cutter 17 that cuts the stencil sheet S. The feeding height position of the stencil sheet S by the stencil sheet feeding roller 15 is the plate cylinder 3 at the initial position as shown in the drawing.
The position of the stencil sheet S is substantially equal to or slightly higher than the position where the head clamp plate 5 is arranged so that the stencil sheet S delivered by the stencil sheet delivery roller 15 reaches the head clamp plate 5 of the plate cylinder 3 in the initial position. Is set to.

In the area above the inclined line L, each plate cylinder 3
A plate discharge unit 19 is provided below each of the plate making base paper sending units 11 at a position corresponding to a side portion of each plate cylinder 3.

Each of the plate discharge units 19 peels the stencil sheet wound around the outer peripheral surface of the plate cylinder 3 from the plate cylinder 3 and sends it into the plate discharge box 21.
Have three.

A press roller 25 is arranged in a region below the inclined line L corresponding to each plate cylinder 3. The press rollers 25 are arranged so as to face the outer peripheral surface of the plate cylinder 3, and are pressed and driven toward the outer peripheral surface of the plate cylinder 3 by a press roller driving means (not shown) in synchronization with the rotation of the plate cylinder 3. It is like this.

A printing paper separating claw 27 is provided adjacent to each plate cylinder 3 on the downstream side of the press roller 25 in the flow of the printing paper.

Between the plate cylinders 3 adjacent to each other, a conveyor device 29 for conveying the printing paper between the plate cylinders is fixedly arranged along the inclined line L. The conveyor device 29 is of a suction type including an endless belt conveyor and a suction means for sucking the printing paper toward the endless belt conveyor, and the printing paper is inclined without contacting the upper surface (printing image surface) of the printing paper. It is configured to be conveyed between the plate cylinders 3 along L, and to feed the printing paper between the plate cylinder 3 one below and the press roller 25 corresponding thereto. This suction type conveyor device 29
May be equivalent to the printing paper transporting means for paper discharge, and if a detailed description of this printing paper transporting means is required, refer to Japanese Utility Model Publication No. 2-35717.

A conveyor device 29 is provided between the lowermost plate cylinder 3 and a paper discharge table 31 attached to the lower part of the cabinet 1.
Suction-type sheet discharge conveyor devices 33 and 35 having the same structure as the above are provided.

At the upper part of each of the conveyor devices 29 and the upper part of the paper discharge conveyor device 35, a drying heater 37 for heating and drying the printing ink for forming a printed image on the printing paper.
Are arranged.

A timing roller 39 is provided above the uppermost plate cylinder 3. The timing roller 39 is rotationally driven by a motor (not shown), and is configured to feed the printing paper between the uppermost plate cylinder 3 and the corresponding press roller 25 at a predetermined timing.

In the triangular area below the slant line L, the paper feed trays 41 are arranged in the upper and lower three stages in the illustrated embodiment. The paper feed tray 4 is provided above each paper discharge tray 41.
A paper separating roller 43 for feeding the printing paper one by one is provided.

A sheet transport unit 45 is provided on one side of the cabinet 1 so as to be openable and closable. The paper transport unit 45 includes belt conveyor devices 47 and 49 for vertically transporting the print paper delivered from each paper feed tray 41 to the timing roller 39, and paper feed guide plates 51 and 53.

A print manuscript reading unit 55 is provided on the upper part of the cabinet 1, and the print manuscript reading unit 55 has a full-color image scanner 57 for photoelectrically reading the image of the print manuscript.

The image reading signal of the print original read photoelectrically by the image scanner 57 is inputted to the plate-making data forming device 59. Plate-making data creation device 59
Is configured to input an image reading signal of a print document, perform color separation of the document image, create a plate-making data signal of each color, and output this to the thermal head 13 of each plate-making base paper sending unit 11.

According to the above configuration, the image scanner 57 of the image reading unit 55 photoelectrically reads the image of the print original, and the image reading signal is input to the plate-making data creating device 59. The plate-making data creating device 59, which receives the image reading signal of the printed document, performs color separation of the document image from the input signal, and separates each color, such as yellow, magenta,
A plate-making base paper sending unit 11 which creates plate-making data signals for each color of cyan and black and corresponds the plate-making data signal of each color.
Output to the thermal head 13.

By applying a plate making data signal to the thermal head 13 of each stencil sheet sending unit 11, the thermal bed 13 heat-sensitively stencil punches images for stencil printing of each color on the stencil sheet S by the dot matrix method. Form and perform digital platemaking.

In parallel with this, the stencil sheet of the plate cylinder 3 which has been used is discharged from the plate discharging roller 23 of the plate discharging unit 19.
Then, it is stripped from the plate cylinder 3 and fed into the plate discharge box 21 to discharge the plate.

As described above, the stencil sheet S made by the stencil sheet feeding unit 11 for stencil printing of each color is directed to the outer peripheral surface of the corresponding plate cylinder 3 by the stencil sheet feeding roller 15. Is sent out, and its tip is the plate cylinder 3
It is clamped by the base paper clamp plate 5, and is wound around the outer peripheral surface of the plate cylinder by rotating the plate cylinder 3 in the clockwise direction. The stencil sheet S is cut into an appropriate length by the sheet cutter 17. As a result, the plate making and printing of each stencil sheet S is completed.

At the time of printing, printing paper of a predetermined size is fed from the paper feeding tray 41 to the paper feeding unit 45 one by one by the paper separating roller 43, and the printing paper is guided by the paper feeding guide plate 51 to be conveyed by the belt conveyor device. It is fed vertically by 47 and 49, and is fed up to the timing roller 39 by being reversed and guided by the paper feed guide plate 53.

The timing roller 39 feeds the printing paper between the uppermost plate cylinder 3 and the corresponding press roller 25 at a predetermined timing, and the uppermost plate cylinder 3 and the corresponding press roller 25 are fed. The printing paper sent in between is pressed by the press roller 25 toward the outer peripheral surface of the plate cylinder 3. As a result, the printing paper is pressed against the stencil sheet that has already been wound around the outer peripheral surface of the plate cylinder 3, and a yellow printing image is formed on the upper surface by the transfer of the printing ink.

The printing paper is conveyed by the conveyor device 29 along the inclined array line (inclination line L) of the plate cylinder 3 without rubbing the printed image surface, and the plate cylinder 3 one lower than the plate cylinder 3 and the press corresponding thereto. It is fed between the roller 25. The printing ink that forms a print image on the printing paper in this conveying process is heated and dried by the drying heater 37.

This printing paper is pressed toward the outer peripheral surface of the plate cylinder 3 by the plate cylinder 3 one below it and the corresponding press roller 25. As a result, the printing paper is pressed against the stencil paper that is wound around and mounted on the outer peripheral surface of the plate cylinder 3, and a magenta color print image is overprinted by the transfer of the printing ink.

After that, the above-described operation is repeated for each plate cylinder 3, and, for example, cyan and black print images are sequentially overprinted on one sheet of printing paper, and full-color printing is performed.

The printing paper on which all printing has been completed is ejected onto the paper ejection tray 31 by the paper ejection conveyor devices 33 and 35.
Also in this paper discharge and conveyance process, the printing ink that forms a printed image on the printing paper is heated and dried by the drying heater 37.

The plate-making data creating device 59 does not necessarily have to have a color separation function for the original image, and the plate-making data creating device 59 uses the image scanner 57 of the image reading unit 55 for simple overprinting. A plate-making data signal based on a plurality of types of printing originals that are sequentially read may be output to the thermal head 13 of each plate cylinder 3.

In this stencil printing machine, single color printing, 2
When only a part of the plate cylinder 3 is used for color printing or the like, the flat part of the unused plate cylinder 3 has a press roller 25.
It is only necessary to stop the rotation at a position opposite to and to allow a printing paper to pass freely by forming a gap with the press roller 25.

In the above-described embodiment, the same number of plate making paper feeding units 11 as the number of plate cylinders 3 are provided.
However, as shown in FIG. 3, the plate making base paper feeding unit 11 is fixedly arranged corresponding to the guide rail 61.
Is provided so as to be movable along the inclined line L, and each plate cylinder 3
May be selectively located at a position corresponding to.

In this case, since one plate-making base paper sending unit 11 carries out plate making for each plate cylinder 3, only one plate-making base paper sending unit 11 is required regardless of the number of plate cylinders 3.

It is preferable that the slanted line L is a straight line over the whole in order to ensure the paper feeding, but the paper feeding path is a straight line at least between the plate cylinders 3 and has a large bent portion. Unless it is not, the inclination line L may be gently bent as shown in FIG. 4, because the reliability of the sheet conveyance is maintained for the time being.

[0048]

As can be understood from the above description, according to the stencil printing apparatus of the present invention, the plate cylinders are spaced apart from each other in a line along the inclined line which is inclined vertically with a predetermined inclination angle. By being arranged, the form of the conveying path of the printing paper between the plate cylinders becomes a straight line along the inclined line, and the form of the conveying path of the printing paper has the form of the conveying path of the printing paper. The inclination of the plate cylinder does not become complicated, and the risk of paper jams is reduced, and even if a paper jam occurs, it can be removed easily with good workability and maintainability. By arranging the plate-making means, plate-discharging means, and paper-feeding means in the spaces above and below the line, downsizing is possible, and there is no need for a downsized large installation space. A cylinder type stencil printer Made to be.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a stencil printing apparatus according to the present invention.

FIG. 2 is a partially enlarged configuration diagram showing an embodiment of a stencil printing apparatus according to the present invention.

FIG. 3 is a schematic configuration diagram showing another embodiment of the stencil printing machine according to the present invention.

FIG. 4 is a layout diagram of a plate cylinder showing another embodiment of the stencil printing machine according to the present invention.

[Explanation of symbols]

 3 Plate cylinder 7 Squeegee blade 9 Ink tube 11 Plate making base paper feeding unit 13 Thermal head 15 Base paper feeding roller 19 Plate discharging unit 25 Press roller 29 Conveyor device 33 Paper discharging conveyor device 35 Paper discharging conveyor device 41 Paper feeding tray 43 Paper separating roller 45 Paper Conveyance unit 55 Printed document reading unit 57 Image scanner 59 Plate making data creation device

Claims (3)

[Claims] 1. A plurality of plate cylinders, which are spaced apart from each other in a row along an inclined line which is inclined in a vertical direction at a predetermined inclination angle, and each of which is driven to rotate about its own rotation center axis. The stencil sheet is disposed at a position corresponding to each side portion of the plate cylinder in a region above the sloping line, and the stencil sheet for making the stencil sheet and the stencil sheet feeding section for sending the stencil sheet toward the outer peripheral surface of the plate cylinder A stencil sheet delivery means including and a stencil sheet which is arranged at a position corresponding to each side portion of the plate cylinder in an area above the inclined line and which is wound around the outer peripheral surface of the plate cylinder. A plate discharge means for removing from the plate cylinder, an ink supply squeegee means arranged inside each of the plate cylinders, and an ink jet squeegee unit arranged opposite to the outer peripheral surface of each of the plate cylinders in a region below the inclined line. , Press the printing paper toward the outer peripheral surface of the plate cylinder A printing roller is disposed between the press roller and the plate cylinders adjacent to each other, and conveys the printing paper between the printing cylinders along the inclined line, and the printing paper is placed between the printing cylinder one lower level and the corresponding press roller. An inter-plate-cylinder printing paper conveying means for feeding in, a timing roller means for printing paper feeding for feeding a printing paper at a predetermined timing between the uppermost plate cylinder among the plate cylinders and a corresponding press roller, A paper feeding unit that is arranged in a region below the slant line and that feeds the print sheets one by one; and a print sheet that is arranged in the region below the slant line and that is fed out by the paper feeding unit is the print sheet supply unit. A stencil printing apparatus comprising: a sheet feeding and conveying unit that conveys to a timing roller unit. 2. An image reading unit for photoelectrically reading an image of a printed document and an image reading signal from the image reading unit, and outputs a plate-making data signal based on the image reading signal to the plate-making unit of the plate-making base paper sending unit. 2. A stencil sheet is prepared by digitally making a stencil sheet on the basis of document image data from the stencil data producing section. The stencil printing machine according to. 3. An image reading unit for reading an image of a printed document photoelectrically, and an image reading signal from the image reading unit, and based on the image reading signal, the document image is color-separated to produce a plate-making data signal of each color. Is provided to the plate making unit of the plate making base paper sending unit, and the plate making unit of the plate making base paper sending unit is configured to digitally make a stencil sheet based on the original image data from the plate making data making unit. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus is provided.