JP2000198260A - Stencil printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printing device which is capable of smoothly feeding a printing plate to either of two plate cylinders arranged opposite to each other by a single plate-making device through a simple printing plate feed path which is structurally less complicated. SOLUTION: This stencil printing device has a first and a second plate cylinder 2, 102 arranged opposite to each other, a plate-making means 7 which makes up a master 23 and a paper feed means 5 which feeds a sheet 23 to be printed to a nip part 51 between the first and the second plate cylinder 2, 102. In addition, a displacement means is provided which displaces the plate-making means 7 between a first printing plate feed position for feeding the printing plate to the first plate cylinder 2 and a second printing plate feed position for feeding the printing plate to the second plate cylinder 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus capable of simultaneously printing both sides of printing paper.

[0002]

2. Description of the Related Art Heretofore, in order to reduce the consumption of printing paper, double-sided printing, in which printing is performed on both front and back sides of printing paper, has occupied a large part of printing. For this reason, development of an apparatus in which two plate cylinders are arranged to face each other, and the plate cylinders are pressed against each other via the printing paper to obtain a double-sided printed material by passing the printing paper has been attempted.

A stencil printing apparatus that performs double-sided printing by passing a printing sheet only once between two plate cylinders is disclosed in, for example, Japanese Patent Application Laid-Open Nos.
And JP-A-10-86498. These stencil printing apparatuses are provided with a stencil making device for each plate cylinder, and the stencil feeding position of the stencil making machine with respect to the plate cylinder is symmetrical with respect to the printing paper transport path. The master is pulled out from the accommodated master roll, plate-making is performed, cut into lengths of one plate, and wound around a plate cylinder.
However, these stencil printing apparatuses have the following problems.

[0004] Space is required for arranging plate making devices above and below the sheet transport path, and the device becomes large. In particular, the stencil making device disposed below needs to be located below this space, avoiding the space in which the paper feed table moves up and down, greatly affecting the size of the stencil printing apparatus.

[0005] Due to the recent demand for higher image quality, a thermal head used for plate making is required to have a high resolution, and despite the high cost, a plate making device is provided for each plate cylinder. Then, the cost rises.

In view of these problems caused by providing a plate making device on each plate cylinder, a stencil printing apparatus that supplies a plate to two plate cylinders by one plate making device is disclosed in Japanese Patent Laid-Open No. 6-7 / 1994.
This is disclosed in, for example, Japanese Patent Application Laid-Open No. 1996, Japanese Patent Application Laid-Open No. 9-234941, and the like. According to the stencil printing apparatus described in each of these publications, since one stencil making apparatus is used, the arrangement space can be reduced, the structure can be unified, and the cost can be reduced.

[0007]

However, in the above-mentioned stencil printing apparatus, there is generally considered a problem that a thin and rigid master can be satisfactorily supplied to a plate cylinder arranged at a higher level. In the stencil printing apparatus described above, there is a problem that a master feeding path for feeding a plate to a plate cylinder is complicated. Further, in any of the above stencil printing apparatuses, there is a problem that the sheet feeding path is complicated and long in order to secure the plate feeding path and the sheet feeding path.

According to the present invention, it is possible to satisfactorily supply a plate using a simple plate supply path to both of two plate cylinders disposed opposite to each other by one plate making apparatus, and to avoid complication of a sheet supply path. It is an object to provide a stencil printing apparatus.

[0009]

In order to achieve the above object, the invention according to claim 1 comprises a first and a second plate cylinder arranged opposite to each other, plate making means for making a master plate,
In a stencil printing machine having a sheet feeding means for feeding a sheet to be printed on a portion opposed to a first plate cylinder and a second plate cylinder, the plate making means is fed to the first plate cylinder. It is characterized by having a displacement means for displacing between a first plate feeding position and a second plate feeding position for feeding a plate to the second plate cylinder.

According to a second aspect of the present invention, in the stencil printing machine of the first aspect, the stencil making means and the paper feeding means are substantially integrated.

According to a third aspect of the present invention, in the stencil printing apparatus according to the second aspect, the sheet feeding means feeds a sheet to the facing portion in a state where the plate making means occupies the first plate feeding position. It can be sent.

The invention described in claim 4 is the first to third aspects of the present invention.
In the stencil printing apparatus according to any one of the above, the displacement means, a rack provided on a support of the plate making means,
It is characterized by having a pinion that engages with the rack, and a drive unit that rotationally drives the pinion.

[0013] The invention according to claim 5 is the invention according to claims 1 to 4.
In the stencil printing machine according to any one of the above, the stencil making means supplies the master to the first or second plate cylinder by hanging the master under its own weight.

[0014]

FIG. 1 shows a stencil printing apparatus to which the present invention is applied and which can perform simultaneous double-sided printing. The stencil printing apparatus 1 includes a printing drum (upper) serving as a first printing cylinder arranged opposite to each other.
2. A printing drum (lower) 102 as a second plate cylinder, a stencil making device 7 as stencil making means for making stencil sheet 23 as a master, and a printing unit as a printing position where both printing drums 2 and 102 face each other. Paper feeder 5 as paper feeding means for feeding print paper 34 as a sheet for printing on 51
And a guide member 16 for guiding the printing paper 34 sent from the paper feeding device 5 to the printing unit 51, a discharge tray 91 on which the printed printing paper 34 is loaded, and a print drum (upper) 2. A plate discharging device (upper) 4 serving as a first plate discharging device and a plate discharging device (lower) 104 serving as a second plate discharging device disposed corresponding to the printing drum (lower) 102 are mainly arranged. Have.

A large number of printing papers 34 are placed on a paper feeding table 33 which forms a part of the paper feeding device 5 and are conveyed while being separated one by one. , And is sent out to the paper discharge table 91. Several transporting means are involved before the paper is conveyed from the paper feed tray 33 to the paper discharge tray 91, and the main ones are a paper feed roller 35, a separation roller 36, a feed roller 37 as a registration roller, Paper output device 4
1 and so on. The sheet feeding device 5 includes a sheet feeding roller 33, a separation roller 36, a feed roller 37,
From the separation roller 36 through the feed roller 37, the sheet feeding device 5
And a guide 6 for forming a transport path for the printing paper 34 toward the outside of the printer. Although not shown, the paper feed roller 35
Is supported so as to be swingable around the axis of the separation roller 36, and the position of the paper feed roller 35 is detected by a sensor (not shown) so that the uppermost printing paper 34 always has a height suitable for paper feeding. Is controlled. It should be noted that as the sheet feeding progresses, the position of the sheet feeding roller 35 is lowered, and if the position is detected by a sensor (not shown), the sheet feeding table 33 is controlled to move up by a predetermined amount.

The separation roller 36 rotates in conjunction with the sheet supply roller 35. The separation roller 36 includes a separation roller (upper) 36a, and a separation roller (lower) 36b that rotates counter to the separation roller (upper) 36a at a position facing the separation roller (upper) 36. The printing paper 34 is separated and sent out one by one by the rotation of the paper roller 35 and the separation roller 36. The feed roller 37 includes a feed roller (upper) 37a and a feed roller (lower) 37b arranged so as to face each other.
a, between the guide (upper) 6a and the guide (lower) 6b that constitute the guide 6 by inheriting the feeding of the printing paper 34 that has been separated and sent out by the separating unit including the separating roller (lower) 36b. And an ink roller (upper) 44 and an ink roller (lower) 14 passing between an upper guide member 16 a and a lower guide member 16 b constituting the guide member 16.
4 feeds out to a printing section 51 composed of a nip formed between the printing drums 2 and 102.

The printing paper 34 that has exited the printing section 51 is sent to a paper ejection device 41, and is sent from the paper ejection device 41 to a paper ejection table 91. The paper discharge device 41 has an upper guide 41a, a lower guide 41b, and a plurality of feed rollers 41c provided on each of the guides 41a and 41b, and guides the printed printing paper 34 by upper and lower guides 41a and 41b. Meanwhile, the sheet is conveyed toward the sheet discharge table 91 by the feed roller 41c. The sheet feeding device 5 side of the guide member 16 is expanded, so that the printing sheet 34 conveyed from the guide 6 is smoothly received. The paper discharge tray 91 includes a mounting table 91a on which the printing paper 34 is stacked, an abutting plate 91b provided at a leading end of the mounting table 91a to abut the leading end of the printing paper 34, and printing provided on both side edges of the mounting table 91a. A regulating plate 91c for regulating a side edge of the sheet 34;

The feed roller (upper) in the path of the printing paper 34 from the paper feed tray 33 to the paper discharge tray 91 as described above.
Nip 37 between feed roller 37a and lower feed roller 37b
The path including N, passing through the printing section 51 via the guide 6 and the guide member 16 and reaching the sheet discharge table 91 is particularly referred to as a feeding path of the printing paper during printing, that is, a conveying path. A printing device (upper) 60 a is provided on the upper side of the transport path, that is, on the front side of the printing paper 34.
However, on the lower side of the transport path, that is, on the back side of the printing paper 34, printing devices (lower) 60b are provided at symmetrical positions about the transport path. The internal configuration of the printing device (upper) 60a and the printing device (lower) 60b is such that the arrangement of the respective components is such that an ink supply pipe (not shown) in each of the drums 2 and 102, doctor rollers 45 and 145, and ink reservoirs 46 and 146.
And the plate discharging devices 4 and 104 are in a symmetrical relationship with each other. Therefore, for some of the common configurations,
The description of the configuration of the printing device (upper) 60a will be replaced with the description of the printing device (lower) 60b. Regarding the components of the printing device (lower) 60b whose description is omitted, the printing device (upper) 6
The component name of 0a is replaced by (lower) replaced by (upper) to (lower), and the code of (upper) plus 100 is the lower (lower) code. .

The printing device (upper) 60a has at least a printing drum (upper) 2 and a plate discharging device (upper) 4. The printing drum (upper) 2 has a heat-sensitive stencil sheet (upper) 2
3 has a base paper latching device (upper) 28 as a clamper for holding the tip of 3 and a porous support plate 83, and a support shaft (upper) 9
It is supported at 0. The porous support plate 83 is formed of a thin metal plate and has a large number of perforations on its surface, and when a stress is applied from the inside of the print drum (upper) 2 in the radial direction of the print drum, its peripheral surface is formed. It is possible to easily swell from the peripheral surface of the drum flange (not shown). Porous support plate 8
A mesh screen (not shown) is wound around the outer peripheral surface of the device 3. The configuration of the print drum (upper) 2 is adopted as it is in the print drum (lower) 102. However, regarding the printing drum (lower) 102, the shape and arrangement of members except for the ink supply pipe, the doctor roller 145, the ink reservoir 146 and the like are symmetrical to those of the printing drum (upper) 2.

Inside the printing drum (upper) 2, an ink supply pipe (upper) (not shown) for supplying ink to the inner peripheral surface of the porous support plate 83, an ink supply roller (upper) 44, and a doctor roller (upper) ) 45 and an ink supply device (upper) 38 composed of a wedge-shaped ink reservoir (upper) 46 formed by an ink supply roller (upper) 44 and a doctor roller (upper) 45. Printing device (bottom) 60b
Has at least a print drum (lower) 102 and a plate discharging device (lower) 104. Print drum (top) 2,
In the vicinity of the peripheral surface of the (lower) 102, the printed paper 34 is placed on the printing drum (upper) 2 or (lower) 10 due to the viscosity of the ink.
In the case where the sheet has been wound around the sheet 2, sheet discharge stripping claws 39 and 139 are provided for stripping the leading end side. Discharge release nail 3
9 and 139 can swing, and by this swing, they can freely contact and separate from the peripheral surface of the printing drum (upper) 2 or the printing drum (lower) 102. The print drum (lower) 102 is supported by a support arm (not shown) that supports a support shaft (lower) 190 so as to be able to approach and separate from the print drum (upper) 2 freely. The print drum (lower) 102 separates from the print drum (upper) 2 in synchronism with the occupation of the 128 by opposing positions.

The plate discharging device (upper) 4 is composed of a plate discharging roller (upper) 91a, a plate discharging conveyor belt 93a stretched between plate discharging rollers (upper) 92a, and a plate discharging roller (upper) 91.
b, means for transporting the used stencil sheet 23 composed of a pair of the stencil transfer belt 93b wound around the stencil roller (top) 92b, a stencil box (top) 94 for storing the used stencil sheet 23, and used It comprises a compression plate (upper) 95 for compressing the stencil sheet 23 and the like. Printing drum (upper) 2
And the line connecting the nip between the plate discharging roller (upper) 91a and the plate discharging roller (upper) 91b and the peripheral surface of the printing drum (upper) 2 intersect.
The position (upper) at which the stencil sheet is peeled off from the printing drum (upper) 2 is positioned.

The printing device (upper) 60a and the printing device (lower) 6
The document image reading unit 10 is located above the unit case provided with 0b and the like. The document image reading unit 10
A document receiving table 22 for placing a document, a document transport roller 11a for separating and transporting the documents one by one, and a document separating roller 1
1b, contact glass 1 on which original to be read is placed
9, a transport roller 17, a document guide plate 21 arranged around the transport roller 17 for guiding a document, a movable guide plate 16 for switching the course of the document, and a document discharge for storing the document sent through the contact glass 19. Table 20,
An endless wide transport belt 15 for feeding a document over a contact glass 19, and a roller 18 supporting the transport belt 15
a, 18b, a reading sensor device 13 provided below the contact glass 19, and the like. Movable guide plate 16
1 can be switched between a position shown by a solid line and a position shown by a broken line in FIG. 1 by a driving means (not shown), for example, a solenoid. In the position shown by the solid line, the document functions to guide the document between the contact glass 19 and the movable guide plate 16, and in the position shown by the broken line, the document functions to guide the document to the document discharge table 20. The transport roller 17, the document guide plate 21, the movable guide plate 16, and the like have a function of turning the document over and sending it out to the contact glass 19. The stencil printing machine 1 has a storage means (not shown) for storing the image data read by the reading sensor device 13 and outputting it to the stencil making device 7 in a timely manner.

The stencil making device 7 includes a support means 23a for supporting a master roll in which the stencil sheet 23 is formed into a roll, and a thermal head 24 disposed on the film surface side of the stencil sheet 23.
A platen roller 25 disposed on the base member side of the stencil sheet 23 facing the thermal head 24;
0, a feed roller pair 26, a plate feed roller pair 27, and the like. The cutter 30 has a movable rotary blade detailed in Japanese Patent Application No. 10-217802 previously filed by the present applicant. The plate making device 7 and the paper feeding device 5
Both are supported by the housing 61 and are substantially integrated, thereby forming the plate making / sheet feeding unit 8. The plate making / feeding unit 8 includes a printing drum (lower) 102.
1 is located at the home position shown in FIG.

The plate making apparatus 7 has a first plate feeding position shown in FIG. 1 for supplying a plate to the print drum (upper) 2 and a plate supply to the print drum (lower) 102 shown in FIG. And a second plate feeding position, and is displaced between the first and second positions by the displacement means 62 shown in FIG. As shown in FIG. 3, the displacement means 62 includes a rack 63 provided in a housing 61 which is a support of the plate making device 7, and a pinion which engages with the rack 63 and rotates at a fixed position on the stencil printing machine 1 main body side. 64, and a stepping motor as driving means (not shown) provided on the stencil printing apparatus 1 main body side that rotationally drives the pinion 64. The fixed wall (not shown) on the main body side of the stencil printing machine 1 has a vertically elongated slot 6.
5 are formed. The housing 61 is provided with two pins 66 provided in the up and down direction that slide in the long hole 65. As shown in FIG. 1, when the plate making device 7 occupies the first plate feeding position, the guide 6 faces the guide member 16 and can feed the printing paper 34 to the printing unit 51. As described above, the positional relationship with the plate making device 7 is determined by the housing 61.

As shown in FIGS. 4 and 5, each of the base paper locking devices 28 and 128 includes a shaft 28a and 128a supported by each of the printing drums 2 and 102, and a shaft 28a and 128a.
Stencil paper 23 is held between two arms 28b and 128b whose base ends are rotatably supported at both ends of the printing drum 2 and the printing drums 2 and 102 which are wrapped around the distal ends of the two arms 28b and 128b. Holding plates 28c and 128c. The plate feeding positions of the plate making device 7 with respect to the printing drums 2 and 102 are shown in FIGS.
8, 128 are positions facing right and are symmetrical with respect to the transport path. The direction in which the holding plate 28c expands is upward, and the direction in which 128c expands is downward, which is symmetric with respect to the transport path of the printing paper 34.

An operation panel (not shown) for performing various operations is provided outside the stencil printing apparatus 1. The operation panel includes a plate-making start button for instructing execution of plate-making, a print start button for instructing execution of printing, a stop button for stopping operation of the stencil printing machine, In addition to a numeric keypad for instructing the number of copies, the number of copies, and the like, a print mode designating key as a print mode designating unit for designating a print mode on which side of printing paper to perform printing is provided. The print mode designation key is used for both print drums 2 and 102
A double-sided print button which is a switch for instructing printing in a duplex printing mode in which printing is performed on both sides of a printing paper using a print drum, and a table for printing only the surface of the printing paper by the printing drum (upper) 2, that is, a printing instruction in the front side printing mode. It has a single-sided print button and a back-sided single-sided print button for printing only the back side of the printing paper by the print drum (lower) 102, that is, a print command in the back side print mode. The front side print mode and the back side print mode are collectively referred to as a single side print mode.

When the double-sided print button is pressed to specify the double-sided printing mode, the stencil sheet 23 on which the predetermined stencil making has been performed is supplied to both printing drums 2 and 102. When the front side single-sided print button is pressed to specify the front side print mode, the stencil sheet 23 on which a predetermined stencil making has been performed is supplied to the print drum (upper) 2, and the unstenciled stencil sheet is supplied to the print drum (lower) 102. The base paper 23 is supplied. When the back-side single-sided print button is pressed to specify the back side print mode, the unprinted stencil sheet 23 is supplied to the printing drum (upper) 2 and the stencil sheet is subjected to predetermined stencil printing to the printing drum (lower) 102. The base paper 23 is supplied. Hereinafter, printing in each mode will be described.

Double-sided printing mode In addition to selecting the double-sided printing button on the operation panel, the required number of prints is indicated by the ten keys. On the other hand, when a predetermined document is set on the document receiving tray 1 and the plate making start button is turned on, the processing of the used stencil sheet (upper) 23 remaining on the printing drum (upper) 2 in the previous printing process is performed next. It is performed as follows. When the printing drum (upper) 2 rotates in the direction of the arrow a and the stencil retaining device (upper) 28 reaches a stripping position (upper) near the plate discharging device (upper) 4, the stencil retaining device is stopped. (Upper) 28 is operated by an opening / closing mechanism (not shown), and used stencil sheet (upper) 2
The clamp at the tip of No. 3 is released. The used stencil sheet (upper) 23 released by the release of the clamp at the leading end is used as the stencil release rollers (upper) 91a, 91b of the stencil discharging device (upper) 4, and the stencil rollers (upper) 92a, 92.
b, the plate is discharged from the leading end side by the plate discharge peeling / conveying section composed of the plate discharge transport belts (upper) 93a, 93b, and starts to be discharged into the plate discharge box (upper) 94. The discharged used stencil sheet (upper) 23 is completely printed drum (upper).
At the time when the compression plate (upper) 2 is peeled off, the compression plate (upper) 95 is lowered and compressed inside the plate discharging box (upper) 94. Similarly, the used drum stencil (lower) 23 is peeled off from the printing drum (lower) 102. Such processing of the used stencil sheet is simultaneously performed in the printing drum (upper) 2 and the printing drum (lower) 102.

Printing drum (upper) 2, printing drum (lower) 1
Reference numeral 02 denotes a used stencil sheet (upper) 23 and a used stencil sheet (lower) 23, respectively, in a plate discharging device (upper) 4 and a plate discharging device (lower).
While being taken in by 104, both printing drums 2 and 102 rotate in the direction of arrow a, and both printing drums 2 and 102 further rotate through a predetermined position where both used stencil sheets 23 and 23 are completely discharged. When the stencil retaining device 28 is positioned at the stencil supply position shown in FIGS. 1 and 4, a sensor (not shown) detects this and stops the rotation of the printing drums 2 and 102.
The two printing drums 2 and 102 stand by in a state in which the rotation is stopped until plate feeding of the stencil sheet 23 is started with respect to the stencil retaining device (upper) 28.

In parallel with the plate discharging process, a well-known document reading process starts simultaneously in the document image reading section 10, and image data of the document is read by the reading sensor device 13, and photoelectrically converted in the reading sensor device 13. The electric signal is input to an A / D (analog / digital) conversion board (not shown) provided in the main body of the stencil printing apparatus 1 and stored in a storage unit (not shown) provided in the main body of the stencil printing apparatus 1. . At the same time as the storage, the plate making device 7
Thus, the stencil feeding process starts together with the stencil making process for the stencil sheet 23.

In the stencil making apparatus 7 occupying the first stencil feeding position, the platen roller 25 pressing the stencil sheet 23 against the thermal head 24 and the feed roller pair 26 rotate, and the stencil sheet 23 is conveyed. Stencil 2 to be transported
In contrast, a plurality of heating elements arranged in a line on the thermal head 24 are stored in the storage means (not shown), subjected to various processes on the plate making board, and sent according to digital image signals of the original. The stencil sheet 23 is melted and perforated. As shown in FIG. 4, the stencil sheet 23 having been made stencil hangs down due to its own weight with the rotation of the pair of stencil feeding rollers 27, and a stencil locking device (FIG. When the upper sheet 28 is reached, the stencil locking device (upper) 28 is closed as shown by the broken line in FIG. The two printing drums 2 and 102 rotate in the direction indicated by the arrow b, and the stencil sheet 23 is gradually wound around the outer peripheral surface of the printing drum (upper) 2. Stencil sheet 23 after stencil making
Is cut to a predetermined length by the cutter 30.

As soon as the stencil sheet 23 is cut, FIG.
As shown in (a), the pinion 64 is driven to rotate in the direction of the arrow c by the stepping motor, and the plate making / feeding unit 8 is displaced downward until the plate making device 7 occupies the second plate feeding position. The printing drums 2 and 102 further continue to rotate in the direction of the arrow b. When the state shown in FIGS. 1 and 5 is reached, the rotation is stopped and the base paper locking device (lower) 128 is opened. The plate making device 7 starts plate feeding to the printing drum (lower) 102 at the same time when the base paper locking device (lower) 128 is expanded.
In the plate making process and the plate feeding process performed by the plate making device 7, the stencil sheet 23 to be supplied to the printing drum (upper) 2 was made, except for the mode of plate making, the operation timing of the cutter 30, and the mode of clamping of the stencil sheet 23. It is done in the same way as in the case. As shown in FIG. 5, the stencil sheet 23 is also supplied to the printing drum (lower) 102 by hanging down by its own weight, but as shown in FIG.
Since the stencil sheet 23 is wound after being folded by 28c, the stencil sheet 23 is wound around the printing drum (lower) 102 in a state where the stencil sheet 23 is turned upside down and compared with the case where the stencil sheet 23 is wound around the printing drum (upper) 2. Accordingly, the length from the leading end to the position where the stencil should be started is increased by the length of the portion bent by the holding plate 128c (this length is defined as L). Therefore, a stencil sheet 23 for supplying a plate to the printing drum (bottom) 102
Of the stencil sheet 23 to be supplied to the printing drum (upper) 2 has a length L longer than the position where stencil making should be started.
Started after sending That is, the thermal head 2
4 is delayed by a predetermined time corresponding to the length L.

When the stencil sheet 23 on which the stencil is made is clamped by the stencil holding device (lower) 128, the printing drums 2 and 102
Rotates in the direction indicated by the arrow b, and the stencil sheet 23 is gradually wound around the outer peripheral surface of the printing drum (lower) 102. The perforated stencil sheet 23 is cut by the cutter 30 by a length longer than the stencil sheet supplied to the printing drum (upper) 2 by L, and the whole is wound around the printing drum (lower) 102. The stencil sheet 23 is cut, and the stencil feeding process for the printing drum (lower) 102 is completed.
As shown in (b), the pinion 64 is rotationally driven by the stepping motor in the direction of the arrow d until the plate making device 7 occupies the first plate feeding position, that is, the paper feeding device 5 sends the printing paper 34 to the printing unit 51. The stencil making / sheet feeding unit 8 is displaced upward until it occupies the feeding position where feeding is possible.

In the subsequent printing step, the top sheet of the printing paper 34 stacked on the paper feed table 33 is directed to the feed roller 37 by the paper feed roller 35 and the separation roller 36 at a predetermined timing. The print drum (upper) 2 and the print drum (lower) 102 are fed by the feed roller 37.
Print drum at a predetermined timing synchronized with the rotation of the upper (upper)
2 and the printing drum 51 (below). The printing paper 34 includes a plate-making unused stencil sheet 23 newly attached to the outer peripheral surface of the printing drum (upper) 2 and a plate-making unused stencil sheet 23 newly attached to the outer peripheral surface of the printing drum (lower) 102. At the same time, the printing ink is transferred from the perforated portion of the perforated unused stencil sheet 23 and the perforated portion of the perforated unused stencil sheet 23 to the front and back surfaces of the printing paper 34 to perform double-sided printing.

When the printing paper 34 printed in this way passes the printing section 51, each of the paper discharge strips 39, 139
Printing drum (upper) 2 or printing drum (lower) 10
The stencil sheets 23, 23 mounted on the outer peripheral surface of the sheet 2 are peeled off, conveyed by the sheet discharging device 41 and dropped onto the sheet discharging table 91, and the printing step is completed. Next, in a process similar to the plate attaching process, a printing process including a paper feeding, printing, and paper discharging process is repeatedly performed for the number of prints set by the numeric keypad.

Front-side printing mode Printing in the front-side printing mode is performed in substantially the same manner as in the double-sided printing mode. The difference from the double-sided printing mode is that the stencil sheet 23 supplied to the printing drum (lower) 102 is not subjected to stencil making.

Backside printing mode Printing in the backside printing mode is performed in substantially the same manner as in the duplex printing mode. The difference from the double-sided printing mode is that the stencil sheet 23 supplied to the printing drum (upper) 2 is not subjected to stencil making.

Although the embodiment has been described above, no matter which mode is used for printing, the stencil sheet used is replaced when the original is printed in the front-side printing mode after another front-side printing mode. If it is not necessary, it is not necessary to discharge the stencil paper to the plate cylinder which does not need to be replaced. In this embodiment, the sheet feeding device is provided below the plate making device. However, the sheet feeding device may be provided above the plate making device. The home position of the plate making device may be a second plate feeding position. The holding plate provided on the second plate cylinder may expand upward. The configuration and the arrangement state of each of the above-described devices constituting the stencil printing apparatus 1 are merely examples, and may be configured with other known devices and various arrangement states. For example, a stencil printing machine 1
The master is not limited to the above-described thermosensitive digital stencil making type stencil printing apparatus. For example, the master may be discharged by a plate discharging apparatus provided separately from the apparatus main body. It does not necessarily have to be provided in the device main body. The data for plate making may be data read by the document reading device 10 as described above, or data created by a computer or the like. In addition, multi-color printing including full-color printing can be performed as a double-cylinder type having two or more plate cylinders. As printing paper, thick paper, envelopes, and the like can be used in addition to ordinary paper.

[0039]

According to the first aspect of the present invention, the first and second plate cylinders arranged opposite to each other, plate making means for making a master plate, the first plate cylinder and the second plate. In a stencil printing machine having a sheet feeding means for feeding a sheet to be printed on a portion facing a cylinder, a first plate feeding position for feeding the plate making means to a first plate cylinder; The plate cylinder has a displacement means for displacing the plate cylinder between a second plate feeding position and a second plate feeding position. Therefore, one plate making device which is displaced to the first and second positions by the displacement means faces each other. It is possible to provide a stencil printing machine that can satisfactorily supply a plate to any of the two disposed plate cylinders through a simple plate supply path and reduce costs.

According to the second aspect of the present invention, in the stencil printing machine according to the first aspect, since the plate making means and the paper feeding means are substantially integrated, the paper feeding means is displaced together with the plate making means. Therefore, it is possible to provide a stencil printing apparatus in which the sheet feeding is prevented from becoming complicated and the sheet jam is reduced.

According to the third aspect of the present invention, in the stencil printing apparatus according to the second aspect, the sheet feeding means includes a sheet stencil provided on the facing portion in a state where the stencil making means occupies the first stencil feeding position. Can be fed by setting the stencil making means to the first stencil feeding position, so that the sheet can be fed by the paper feeding means. Can be provided.

The invention described in claim 4 is the first to third aspects of the present invention.
In the stencil printing apparatus according to any one of the above, the displacement means, a rack provided on a support of the plate making means,
The stencil printing apparatus having the pinion that engages with the rack and the driving unit that rotationally drives the pinion can provide a stencil printing apparatus having a simple displacement unit.

The fifth aspect of the present invention provides the first to fourth aspects.
In the stencil printing machine according to any one of the above, the stencil making means supplies the master to the first or second plate cylinder by hanging the master by its own weight, so that the sheet feeding means is displaced. In the apparatus, the amount of displacement of the sheet feeding means can be reduced, so that it is possible to provide a stencil printing apparatus capable of shortening the time until the start of printing.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a stencil printing apparatus to which the present invention is applied.

FIG. 2 is a schematic side view showing a state where the plate making apparatus shown in FIG. 1 occupies a second plate feeding position.

FIG. 3 is a schematic side view showing an aspect of displacement of a plate making / feeding unit by the displacement means and the displacement means.

FIG. 4 is a schematic side view showing a mode of plate feeding with respect to a first plate cylinder.

FIG. 5 is a schematic side view showing a state of plate feeding with respect to a second plate cylinder.

FIG. 6 is a schematic side view showing a mode of winding a master by a second plate cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 2 1st plate cylinder 5 Paper supply means 7 Plate making means 23 Master 61 Supporting body 62 Displacement means 63 Rack 64 Pinion 102 2nd plate cylinder

Claims (5)

[Claims] A first plate cylinder and a second plate cylinder which are arranged opposite to each other; plate making means for making a master; and a printing plate for printing on a facing portion between the first plate cylinder and the second plate cylinder. In a stencil printing machine having a sheet feeding means for feeding a sheet, the plate making means is provided with a first plate feeding position for feeding a plate to a first plate cylinder and a second plate feeding for feeding a second plate cylinder. A stencil printing machine characterized by having a displacement means for displacing between a stencil feeding position. 2. A stencil printing apparatus according to claim 1, wherein said stencil making means and said paper feeding means are substantially integrated. 3. A stencil printing apparatus according to claim 2, wherein said sheet feeding means is capable of feeding a sheet to said facing portion when said plate making means occupies said first plate feeding position. A stencil printing machine characterized by the following. 4. A stencil printing machine according to claim 1, wherein said displacement means comprises: a rack provided on a support of said stencil making means; a pinion engaging said rack; A stencil printing apparatus comprising: a driving means for driving the pinion to rotate. 5. A stencil printing machine according to claim 1, wherein said stencil making means causes said master to hang down by its own weight, so that said stencil can be moved relative to said first or second plate cylinder. Stencil printing apparatus, characterized in that the stencil printing apparatus is supplied.