JPH07137413A - Stencil printer - Google Patents

Abstract

PURPOSE:To obtain two printed sheets through one rotation of a plate cylinder and to conduct a gathering action by two sheets (pages) with the connection of a gathering machine by providing a continuous paper supply means for continuously supply two sheets of printing paper during one rotation of the plate cylinder. CONSTITUTION:A stencil printer comprises a rotatable plate cylinder 26, a plate making means 9 selectively thermally perforating a master 6 in accordance with image information, and a cutting means 10 cutting the master 5 In addition, the stencil printer comprises an ink supply means 29 supplying ink to the peripheral surface of the plate cylinder 26, a pressing member 30 pressing printing paper 14 against the peripheral surface of the plate cylinder 26, and a paper separating and supplying means 24 separating the printing paper 14 individually and feeding it into between the plate cylinder 26 and the pressing member 30. In this case, the plate making means 9 is so constructed as to arrange original images for two pages in the transport direction of the master on the master 6 for one plate. A continuous paper supply means 25 for continuously supplying two sheets of printing paper 14 during one rotation of the plate cylinder 26 is provided downstream of the paper separating and supplying means 24.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is capable of perforating a master for one plate wound on a plate cylinder with a heating element such as a thermal head so that two original images are aligned in the master transport direction of the master. The present invention relates to a stencil printing apparatus which is equipped with a plate making means and which prints by winding a plate-made master.

[0002]

2. Description of the Related Art Digital thermal stencil printing has been known as a simpler printing method. This is because the heat sensitive stencil master is brought into contact with a thermal head in which minute heating elements are arranged in a row, and the master is conveyed by a platen roller while energizing the heating elements in a pulsed manner, so that heat fusion is performed based on image information. After perforating, the perforated master is wound around the plate cylinder, and the printing paper is pressed against the outer peripheral surface of the plate cylinder by the pressing member, so that the ink is allowed to pass from the opening portion of the plate cylinder and the perforated portion of the master. A print image is formed by transferring the print image onto a print sheet. The used master used for the stencil printing is discarded after use, and when new printing is performed, the new master is punched and then wound around the plate cylinder.

In order to use the master without waste, it is desirable to cut the master according to the size of the original. However, the size of the plate cylinder is determined by the maximum printing length of the printing paper used in the printing device, and the pressing member is also configured to press the entire opening of the plate cylinder. If the master is cut into short lengths according to the original, the entire area of the opening is not covered with the master, and the pressing member directly presses and contacts the opening. Then, the ink that has exuded from the openings of the plate cylinder adheres to the pressing member, and the pressing member is soiled. In order to prevent this, it is sufficient to change the contact distance of the pressing member to the plate cylinder according to the cutting length of the master to prevent contact with the aperture, but the mechanism becomes very complicated and the device is expensive. Become.

When printing a large original on the next plate,
Since printing was performed with the apertures that were not covered by the master being open, the ink in that part was evaporated and the ink in this part was reduced, so the ink is filled in like the other parts. However, there is a problem in that it takes a long time to print, and a large amount of waste paper that is defective in printing occurs at the beginning of printing, that is, so-called rising is poor. further,
If a short master is used without covering the openings of the plate cylinder, or if it is used in an environment in which dust or the like is floating or if paper that easily produces paper dust is used, these will adhere to the openings. However, there is a problem in that clogging occurs and print quality is significantly reduced.

In order to prevent this, regardless of the size of the printing paper to be printed and the size of the original, if a long master is wound so as to cover all the apertures and ink evaporation is prevented, a short original and When printing is performed using a short printing paper, there is a problem in that the unprinted portion of the master increases and it becomes uneconomical.

Further, since one printing sheet is usually fed by one rotation of the plate cylinder, the number of printed sheets per unit time (one rotation of the plate cylinder) is the same regardless of the size of the printing sheet, and small printing is performed. When printing paper, there has been a problem that the idle time of the plate cylinder becomes longer than the printing time, resulting in poor printing efficiency.

Further, at the time of printing, it takes some time for the ink transferred to the printing paper to penetrate into the printing paper. Then, when the next printing paper is stacked before the ink penetrates into the paper, the ink of the previous printing paper is transferred to the back surface of the next printing paper that is stacked, so-called,
The problem of show-through occurred.

[0008]

In order to solve the above problems, two short original images are sequentially read, and those images are printed on two surfaces in the master transport direction of a master for one plate wound around the plate cylinder. The plate-making means for side-by-side plate making is Japanese Patent Publication No. 21940
And Japanese Utility Model Laid-Open No. 1-115574. However, according to the techniques disclosed in the above publications, only one printed matter can be obtained per one rotation of the plate cylinder. Therefore, for example, when two B5 size originals are continuously made into one master and printed on B5 size printing paper for use, the printing device disclosed in the above publications is used. Then, when feeding B5 size printing paper,
Since only one printed material can be obtained per one rotation of the plate cylinder, the idle time of the plate cylinder becomes long. Therefore, when feeding and printing a B4 size printing paper, since this is cut in half and used after printing, there is a problem that the work efficiency is reduced by the amount of cutting.

Further, when the collating device is connected to the printing device to perform collating work, the bin of the collating device is moved after the plate cylinder makes one rotation to perform collating work. The device could only perform collation work for each sheet (page).

Further, in the conventional stencil printing, in order to prevent the show-through, the printing speed is lowered or the plate cylinder is idled to widen the paper feeding interval. However, such a preventive measure reduces the efficiency of the printing work. There was a problem to do.

The present invention solves such a problem, and it is possible to obtain two printed matter in one rotation of the plate cylinder, and when the collating device is connected, the collating operation is performed for every two sheets (pages). An object of the present invention is to provide a stencil printing apparatus that can be used.

[0012]

To achieve the above object, a stencil printing machine of the present invention comprises a porous and rotatable plate cylinder, and a plate making means for selectively heating and punching a master according to image information. An ink supply unit provided inside the plate cylinder for supplying ink to an inner peripheral surface of the plate cylinder, and a printing paper provided on the outer peripheral surface of the plate cylinder so as to come in contact with and separate from the plate cylinder. It has a pressing member for pressing it, and a separating / feeding means for separating the printing paper one by one and feeding it between the plate cylinder and the pressing member, and is wound around the plate cylinder as the plate making means. In a stencil printing machine having a plate making means capable of arranging two document images side by side in the master transport direction of a master for one plate, the printing paper is continuously printed 2 times during one rotation of the plate cylinder. It is equipped with a continuous paper feeding means for feeding sheets.

[0013]

When printing is performed using about half of the maximum paper that can be printed on the plate cylinder, two master images are arranged side by side on the master for one plate wound around the plate cylinder, and continuous printing is performed. By means of the means, two printing sheets are continuously fed.

[0014]

FIG. 1 is a schematic side view of a stencil printing machine adopting an embodiment of the present invention. This stencil printing machine mainly comprises a plate making unit 1, a paper feeding unit 2, a printing unit 3, a plate discharging unit 4, and a paper discharging unit 5.

The plate making section 1 is provided with a master roll 6a wound in a roll shape.
Is rotatably supported by a support shaft 6b. In the vicinity of the master roll 6a, a thermal head 7 for selectively heating and perforating the master 6 pulled out from the master roll 6a.
And a platen roller 8 that conveys the master 6 while pressing it against the thermal head 7. The plate-making means 9 is similar to that disclosed in Japanese Patent Publication No. 21940/1990, and sequentially reads two original images and arranges them on the two sides in the master transport direction of the master for one plate. Is configured to be possible.

On the downstream side of the plate making means 9 in the master conveying direction,
The cutting means 10 configured to include the upper blade 10a and the lower blade 10b, which cuts the master 6, the transport roller pair 11 which is rotationally driven by the driving means (not shown), and which transports the master 6 to the printing unit 3, and the master 6. A master guide plate 12 that guides the conveyance to the printing unit 3 is provided.

Below the plate making section 1, a sheet feeding section 2 is arranged. The paper feed tray 13 provided in the paper feed unit 2 has print paper 14 stacked on the upper surface thereof and is supported by a support mechanism (not shown) so as to be vertically movable. A call roller 15 is provided above the paper feed table 13 and at a position where it can contact the print paper 14, and a call roller 15 is provided downstream of the call roller 15 in the print paper feeding direction. Separation roller 16 is arranged in parallel with. Call roller 1
5 and the separating roller 16 are respectively the calling roller shaft 1
5a and a separation roller shaft 16a are rotatably supported, and the shafts are connected to each other by a toothed belt 17. A separation roller 18 is provided below the separation roller 16, and an outer peripheral surface of the separation roller 18 is in contact with an outer peripheral surface of the separation roller 16.

A drive means (not shown) is connected to the separation roller shaft 16a via an electromagnetic clutch (not shown). The separation roller 16 and the calling roller 15 are rotationally driven in the clockwise direction by this drive means. Printing paper 14
To deliver. The feeding speed of the printing paper 14 by the calling roller 15 and the separating roller 16 at this time is set to be higher than the peripheral speed of the plate cylinder described later. A separation / feeding means 24 is constituted by the above-mentioned paper supply table 13, calling roller 15, separation roller 16, separation roller 18, and the like.

A pressing sheet 19 and a paper guide plate 20 are disposed downstream of the separating roller 16 in the printing paper feeding direction. The pressing sheet 19 has a gently curved shape, and one end thereof is fixed to a mounting base 40 fixed to a side plate (not shown) of the stencil printing apparatus main body. The paper guide plate 20 is fixed to a side plate (not shown) of the stencil printing apparatus main body. The pressing sheet 19 is pressed against the paper guide plate 20 with a preset pressing force. The printing paper contact surfaces of the pressing sheet 19 and the paper guide plate 20 are each coated with a thin layer made of a low friction coefficient member such as fluororesin. Further, the pressing sheet 19 and the paper guide plate 20 are respectively formed with a plurality of openings, and the openings are provided at positions corresponding to the upper and lower sides of the registration roller described later.

A registration roller composed of a finely divided roller is provided at a position near the downstream end of the pressing sheet 19 and the paper guide plate 20 in the printing paper conveyance direction, and at a position facing each other with the pressing sheet 19 and the paper guide plate 20 interposed therebetween. An upper part 21 and a lower part of the registration roller 22 are provided respectively.
Each roller is provided such that its outer peripheral surface faces the above-mentioned aperture and the outer peripheral surface of each roller can be pressed between the sheet 19 and the paper guide plate 20.

The registration roller upper part 21 is rotatably supported by a support shaft 21a, is rocked by a rocking means (not shown), and is provided such that its outer peripheral surface and the outer peripheral surface of the registration roller lower part 22 can come into contact with and separate from each other. ing. Below the registration roller 22
Is rotatably supported by a support shaft 22a, and is rotationally driven at a timing by drive means (not shown) including a fan gear. The paper feed speed of the lower registration roller 22 is set to be substantially the same as the peripheral speed of the plate cylinder, which will be described later, and, as will be described later, the leading edge of the printing paper comes into contact with the trailing edge of the first printing paper. Since the leading edge of the second printing sheet fed so as to be in contact with each other is sent between the plate cylinder 26 and the press roller 30, the sheet feeding amount under the registration roller 22 is the maximum that can be passed through this stencil printing machine. The feeding amount is set to exceed a distance obtained by adding a half of the size of the sheet and a distance from the lower registration roller 22 to a press roller described later.

Below the paper guide plate 20, and near the upstream end of the paper guide plate 20 in the print paper conveyance direction, a paper sensor 23 including a photoelectric sensor is provided. The paper guide plate 20 is formed with an opening through which the optical axis of the paper sensor 23 passes. The paper feed start signal output from the paper sensor 23 is input to a control means (not shown), and the electromagnetic clutch is intermittently operated according to a command from the control means, whereby the separation roller 16 and the call roller 15 are connected. The operation is controlled. A drive unit (not shown) having an electromagnetic clutch (not shown) connected to the above-mentioned calling roller 15, separation roller 16, and separation roller shaft 16a to rotate the separation roller shaft 16a, a pressing sheet 19, a paper guide plate 20, and a registration roller. 21, under the registration roller 2
2. The continuous paper feeding means 25 is composed of the paper sensor 23 and the like.

A printing unit 3 is arranged on the left side of the paper feeding unit 2. The printing unit 3 is mainly composed of a plate cylinder, an ink supply unit, a pressing member, and the like. The plate cylinder 26, which is made of a porous support cylinder and has a mesh screen of resin or metal mesh wound around its outer peripheral surface, is rotatably provided around a central shaft 27 that also serves as an ink supply pipe. And is driven to rotate in a clockwise direction and a counterclockwise direction by a plate cylinder driving means (not shown).

A stage portion 28a is provided on the outer peripheral surface of the plate cylinder 26.
Well-known master locking means 2 including a clamper 28b and a clamper 28b
8 are provided. The clamper 28b is opened / closed by an opening / closing member (not shown), and the locking means 28 opens the plate-making master made by the plate making means 9 on the outer peripheral surface of the plate cylinder 26 and on the outer peripheral surface of the plate cylinder 26. It is locked at a position corresponding to the hole 26a.

Further, inside the plate cylinder 26, a well-known ink supply means 29 comprising an ink roller 29a and a doctor roller 29b is arranged. Ink roller 2
9a is rotationally driven in the clockwise direction by a driving means (not shown), and supplies the ink in the ink reservoir 29c formed of a wedge-shaped space with the doctor roller 29b to the inner peripheral surface of the plate cylinder 26.

A press roller 30 as a pressing member is arranged below the plate cylinder 26. Press roller 3
0 is rotated by a driving means (not shown) and is oscillated selectively by a swinging means (not shown) between a solid line position and a two-dot chain line position, and its outer peripheral surface is brought into contact with or separated from the outer peripheral surface of the plate cylinder 26. It is provided freely. A position sensor 37 that detects the rotational position of the plate cylinder 26 and outputs a paper feed start signal to a control unit (not shown) is provided near the outer peripheral surface of the plate cylinder 26.
By the command from the control means, the electromagnetic clutch is intermittently operated to control the operation of the separation roller 16 and the calling roller 15.

A plate discharge unit 4 is arranged on the left side of the printing unit 3. The plate discharge unit 4 mainly includes an upper plate discharge roller 31, a lower plate discharge roller 32, and a plate discharge box 33. The upper plate discharging roller 31 and the lower plate discharging roller 32 are provided so that their outer peripheral surfaces contact each other, and the lower plate discharging roller 32 is rotationally driven by a driving unit (not shown) and a swinging unit (not shown). The upper plate discharge roller 31 is configured to rotate together with the lower plate discharge roller 32 by being selectively swung between the solid line position and the two-dot chain line position. The plate discharge box 33 is provided so as to be detachable from the stencil printing machine body.

Below the plate discharge unit 4, a paper discharge unit 5 is arranged. The paper discharge section 5 mainly includes a peeling claw 34, a paper discharge member 35, and a paper discharge tray 36. The peeling claw 34 is disposed on the downstream side of the press roller 30 in the printing paper conveyance direction and in the vicinity of the outer peripheral surface of the plate cylinder 26, and selectively drives the solid line position and the chain double-dashed line position in the figure by a driving unit (not shown). Is rotated to.

A paper discharge member 35 is disposed downstream of the press roller 30 in the printing paper conveyance direction and below the peeling claw 34. The paper discharge member 35 is a paper discharge roller 35.
a, 35b and the discharge belt 3 stretched between the rollers
5c and the like. Paper ejection roller 35a
Is driven to rotate by a driving unit (not shown), and the discharge belt 3
5c is moved in the direction of the arrow in the figure, and the printed paper discharged onto the paper discharge belt 35c is discharged. The sheet conveying speed at this time is set to about 1.5 times the peripheral speed of the plate cylinder 26. A paper discharge tray 36 is arranged on the downstream side of the paper discharge member 35 in the printing paper conveyance direction. Output tray 36
Is attached to the main body of the stencil printing machine, and the paper discharge member 3
The printed sheets conveyed by the sheet 5 are sequentially stacked on the upper surface thereof.

The operation will be described below. When a document is set on a document reading unit (not shown) and the plate cylinder 1 rotation / two-sheet feed mode is selected on the operation panel (not shown), the plate cylinder 26 is rotated counterclockwise by the plate cylinder driving means (not shown). .
When the plate cylinder 26 reaches the plate discharge position, the lower plate discharge roller 32 is rocked by a rocking means (not shown), and its outer peripheral surface is brought into contact with the outer peripheral surface of the plate cylinder 26 and wound around the outer peripheral surface of the plate cylinder 26. Scoop up the used master from the rear end. The used master picked up is peeled from the outer peripheral surface of the plate cylinder 26 by the lower plate discharge roller 32 and the upper plate discharge roller 31, and is discarded in the plate discharge box 33 to complete the plate discharge operation. After the completion of the plate discharge, the plate cylinder 26 rotates to the plate supply position where the locking means 28 is located substantially right next to the plate cylinder 26 and stops. In the paper feed unit 2, the paper feed tray 13 is raised by a vertical movement mechanism (not shown), and the uppermost printing paper 14 comes into contact with the call roller 15.

When the plate cylinder 26 stops at the plate feeding position, the clamper 28b is opened by the opening / closing means (not shown), and the plate cylinder 26 is in the plate feeding standby state. The platen roller 8 and the transport roller pair 11 are rotationally driven by driving means (not shown) to start the transport of the master 6, and at the document reading portion, the document image is converted into an electric signal by a CCD or the like.
The thermal head controller energizes the thermal head 7 in pulses through the / D converter. The master 6 has a first area 38 (see FIG. 2) that is heat-melted and perforated by the thermal head 7, and has a platen roller 8 and a pair of transport rollers 11.
And is guided by the master guide plate 12 and inserted between the stage portion 28a and the clamper 28b. When the control means (not shown) determines that the tip of the master 6 has reached the predetermined locking position based on the number of steps of the stepping motor that drives the platen roller 8, the clamper 28b is closed by the opening / closing means and the tip of the master 6 is moved. The plate cylinder 26 is locked on the outer peripheral surface of the plate cylinder 26, and the plate cylinder 26 starts rotating in the clockwise direction at substantially the same peripheral speed as that of the platen roller 8 and the transport roller pair 11.
6 is wound on the outer peripheral surface.

When the master 6 has completed plate making in the first area 38, plate making in the second area 39 is performed. At this time, as shown in FIG. 2A, in the case of making the same document twice, after the plate making in the first area 38, the platen roller 8, the conveying roller pair 11, and the plate cylinder 26 are temporarily stopped from rotating. At the same time as the original is reversely conveyed and read again by the original reading device (not shown), the platen roller 8, the conveying roller pair 11, and the plate cylinder 26 start to rotate again, and the second area 39 as in the plate making of the first area 38. Is made. As shown in FIG. 2B, in the case of making two different originals, after the plate making in the first area 38, the platen roller 8 and the conveying roller pair 1 are used.
1. The rotation of the plate cylinder 26 is temporarily stopped, and the reading of the second document is started in the document reading device (not shown). At the same time, the platen roller 8, the transport roller pair 11, the plate cylinder 2
6 starts to rotate again, and the second area 39 is plate-made like the plate-making of the first area 38. Further, as shown in FIG. 2 (C), when making one large original, the first area 3
8 and the second region 39 are continuously engraved. (For details of the plate making operation, refer to Japanese Patent Publication No. 21940/1990) When the plate making of a predetermined length is judged by the control means (not shown) from the step number of the stepping motor driving the platen roller 8, the cutting is performed. The means 10 cuts the master 6, the rotations of the platen roller 8 and the transport roller pair 11 are stopped, and the plate making operation is completed. The master 6 is pulled out by the rotation of the plate cylinder 26 and wound around the outer peripheral surface of the plate cylinder 26. When the winding of the master 6 around the outer peripheral surface of the plate cylinder 26 is completed, the position sensor 37 outputs a paper feed start signal to the control means (not shown) in synchronization with the rotation of the plate cylinder 26. In response to this signal, the control means sends a command to the separating / feeding means 24, and an electromagnetic clutch (not shown) connected to the separating roller shaft 16a is connected, whereby the separating roller 16 and the calling roller 15 are rotated to 1
The sheet of printing paper 14a is sent out.

The first printing sheet 14a is conveyed so as to pass between the pressing sheet 19 and the sheet guide plate 20,
Eventually, its tip is inserted between the upper registration roller 21 and the lower registration roller 22. At this time, the upper registration roller 21 is swung by a swinging device (not shown), and its outer peripheral surface is brought into contact with the outer peripheral surface of the lower registration roller 22. After that, the separation roller 16 and the calling roller 15
Continues to rotate, and the electromagnetic clutch is disengaged and stopped when the printing paper 14a is fed by an excessive amount to some extent.
The registration roller lower portion 22 is rotationally driven in synchronization with the rotation of the plate cylinder 26, and the printing paper 14a is pressed against the registration roller upper 21 at substantially the same speed as the peripheral speed of the plate cylinder 26, as shown in FIG. After being conveyed and pressed against the outer peripheral surface of the plate cylinder 26 by the press roller 30, it is separated from the outer peripheral surface of the plate cylinder 26 by the peeling claws 34, conveyed by the paper discharge member 35, and discharged onto the paper discharge tray 36. . At this time, the printing paper 14a is accelerated by the paper ejection member 35 set to a paper conveyance speed of about 1.5 times the plate cylinder peripheral speed, and a gap is generated between the printing paper 14a and the next paper, so that the paper is ejected. Problems such as collision with the next sheet on the tray 36 are prevented. In this embodiment, the sheet conveying speed of the sheet discharging member 35 is about 1.5 of the plate cylinder peripheral speed.
Although it was doubled, it was faster than the peripheral speed of the plate cylinder 26,
The speed may be any speed at which a defect such as a collision with the next sheet on the discharge tray 36 is prevented.

When the trailing edge of the first printing paper 14a passes through the paper sensor 23, the paper sensor 23 outputs a paper feed start signal. In response to this signal, the control means sends a command to the separation paper feeding means 24, an electromagnetic clutch (not shown) is connected, the separation roller 16 and the calling roller 15 rotate again, and the second printing paper 14b is sent out. The second printing paper 14b is the printing paper 14a as shown in FIG.
Then, the paper is abutted on the rear end of the printing paper 14a while passing between the pressing sheet 19 and the paper guide plate 20. At this time, due to the pressure contact force of the pressing sheet 19, the printing paper 1
The front end of 4b is regulated so as not to ride on the rear end of the printing paper 14a. Further, the low friction coefficient members respectively provided on the pressing sheet 19 and the paper guide plate 20 reduce the load of the conveying force, thereby preventing the feeding and contact of the paper from becoming unstable. The printing paper 14b is continuously fed by the registration rollers 21 and 22, and the feeding amount of the printing paper 14b is such that when the printing paper 14a is transported, the electromagnetic clutch (not shown) connected to the separation roller shaft 16a is disconnected. When the quantity becomes equal to the quantity, the electromagnetic clutch is disengaged.

After that, when the printing paper 14b is conveyed to the position where it is pressed by the press roller 30 against the outer peripheral surface of the plate cylinder 26, the registration roller upper part 21 is swung to be separated from the registration roller lower part 22 and the registration roller 14b is separated. The rotation of the lower roller 22 is stopped. And the printing paper 14b
Is pulled out while being pressed against the outer peripheral surface of the plate cylinder 26 by the press roller 30, and the peeling claw 34 is pulled out like the printing paper 14a.
The sheet is separated by the sheet, and is conveyed by the sheet discharge member 35 to be discharged to the sheet discharge tray 36.
Discharged on top.

In the above embodiment, when the plate cylinder 1 rotation 1 sheet feed mode is selected on the operation panel (not shown), the paper feed start signal from the paper sensor 23 is ignored, and the paper feed start signal from the position sensor 37. The electromagnetic clutch is configured to be disengaged only by. The relationship between each sensor and the electromagnetic clutch is shown in FIG. The solid line in FIG. 5 shows the relationship in the plate cylinder 1 rotation / two-sheet feed mode, and the broken line shows the plate cylinder 1
The respective relationships in the single-rotation feed mode are shown. A sensor for detecting the size of each sheet is provided on the document reading device and the paper feed table 13, and the control device automatically determines whether or not it is possible to feed two sheets per rotation. May be configured to be selected.

As a modified example of the above embodiment, the paper discharge tray 3
If a collating device is connected to the sheet discharge member 35 instead of 6, and printing is performed in the plate cylinder 1 rotation 2 sheet feed mode, two sheets are discharged to one bin and then switched to another bin. The collating operation can be performed individually, and the printing time can be halved.

Further, as another modified example of the above embodiment, when the plate making is performed in the first area 38 and the printing is made in the one-turn two-sheet feeding mode without making the plate making in the second area 39, the printed paper is A blank sheet is interleaved in the meantime, and the extra ink adhering to the printed sheet is absorbed by the interleaf sheet, so that the problem of show-through can be prevented. The same effect can be obtained even if the plate making is not performed in the first area 38 but only the second area 39.

[0039]

According to the present invention, when printing is performed using about half the maximum paper that can be printed by the plate cylinder, two original images are printed on the master for one plate wound around the plate cylinder. Since the plates are arranged side by side and two printing sheets are continuously fed by the continuous paper feeding means, the printing time can be reduced to half as compared with the normal one-rotation one-sheet printing, and the master plate The area is small, so the master is not wasted. Further, when the collating device is connected, the collating operation for every two pages can be performed by one rotation of the plate cylinder, so that the efficiency of the collating work can be improved. Further, by making only one of the two-sided plate-making, a blank sheet as a slip sheet can be inserted between the printed sheets, and the show-through can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic side view of a main part of a stencil printing apparatus adopting an embodiment of the present invention.

FIG. 2 is a diagram of a document, a master, and a printing sheet for explaining a plate making operation in one embodiment of the present invention.

FIG. 3 is a partial side view showing a main part of a paper feeding unit and a printing unit for explaining an embodiment of the present invention.

FIG. 4 is a partial side view showing main parts of a paper feeding unit and a printing unit, which are used to explain an embodiment of the present invention.

FIG. 5 is a diagram illustrating a relationship between a sheet sensor and a position sensor and an electromagnetic clutch according to an embodiment of the present invention.

[Explanation of symbols]

 9 Plate making means 10 Cutting means 14 Printing paper 24 Separation and feeding means 25 Continuous feeding means 26 Plate cylinder 29 Ink supplying means 30 Pressing member (press roller)

Claims (1)

[Claims] 1. A porous and rotatable plate cylinder, plate making means for selectively heating and punching a master according to image information, and an ink provided on the inner surface of the plate cylinder provided inside the plate cylinder. An ink supply unit for supplying the printing cylinder, a pressing member that is provided so as to be able to come into contact with and separate from the plate cylinder, and presses the printing paper against the outer peripheral surface of the plate cylinder; And a separating member for feeding between the pressing member and the pressing member. As the plate making unit, a master for one plate wound on the plate cylinder is provided with an original image in the master conveyance direction of the master. A stencil printing machine having plate making means capable of making two plates side by side is provided with a continuous paper feeding means for continuously feeding two printing paper sheets during one rotation of the plate cylinder. Stencil printer.