JP2000141855A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printer capable of printing in a large quantity in a short time without introducing increases in a space and a cost capable of printing sheets of a plurality of types. SOLUTION: The stencil printer comprises a plate cylinder 60, a multi-stage sheet feeder 3 having a plurality of sheet storage units 28, 29, 30, 25 and capable of feeding a plurality of types of printing sheets P1, P2, P3, P4, a pressing member 62, a selecting means for selecting one of the storage units, register roller pairs 42, sheet size sensing means 45, 46, 47, 56, sheet presence or absence sensing means 36, 43, 44, 55, and storage means for storing printing sheet feeding time at each storage unit. In this case, when absence of the sheet in the storage unit selected by the selecting means during printing is sensed by the sheet presence or absence sensing means, sheet feeding is automatically switched to the other storage unit for storing the sheets of the same size, and operations of the cylinder 60, the member 62 and the roller pairs 42 are controlled by the control means based on the feeding time of the sheet from the storage unit.

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, and more particularly, to a stencil printing apparatus having a multi-stage paper feeder capable of feeding a plurality of types of printing paper.

[0002]

2. Description of the Related Art Using a plate cylinder consisting of a porous support cylinder and a master having a laminated structure in which a porous support is bonded to a thermoplastic resin film, the thermoplastic resin film surface of the master is heated by a thermal head. After making the perforated plate, it is wound around the plate cylinder, an appropriate amount of ink is supplied to the inner peripheral surface of the plate cylinder by ink supply means provided inside the plate cylinder, and printing paper is pressed by a pressing member such as a press roller or an impression cylinder. A digital thermosensitive stencil printing apparatus which performs printing by pressing ink onto the printing drum by transferring the ink oozed from the opening of the printing drum and the perforated portion of the master onto printing paper is well known.

[0003] This stencil printing apparatus is usually used when printing a large number of prints on a single plate. However, when printing several thousand sheets, a large amount of printing paper cannot be stored inside the apparatus body. , A large-volume paper feeding device outside the device
No. 182748).

In an image forming apparatus such as a copying machine mainly used for forming an image on a plurality of types of paper,
The main paper tray and the auxiliary paper tray are installed side by side on the same plane inside the main body of the machine. Is disclosed in Japanese Unexamined Patent Publication No. 5-221, for example, in which a large amount of paper can be supplied while preventing an increase in the size of the main body by enabling paper to be supplied to an auxiliary paper supply tray during an image forming operation.
No. 536.

[0005] Recently, in order to meet various needs of users, a stencil printing apparatus having a multi-stage paper feeder having a plurality of paper storage units and capable of feeding a plurality of types of printing papers has been developed. Used. In this stencil printing apparatus, the storage capacity of one type of paper is reduced because the height of each paper storage unit is low. However, the above-described image forming apparatus technology is applied to the auxiliary paper feed tray during printing operation. By continuously replenishing paper, a large amount of paper can be fed.

[0006]

However, among the above-mentioned techniques, when a large-volume paper feeder is connected to a stencil printing apparatus, the installation space (especially in the height direction) increases and the cost increases. There is a problem that.

In the technique in which the main paper feed tray and the auxiliary paper feed tray are provided side by side, when the paper in the main paper feed tray runs out, the rotation of the plate cylinder is stopped, and the main paper feed tray is lowered to supply the auxiliary paper. After the paper in the paper tray is transferred and the main paper feed tray is raised to the paper feed position, the rotation of the plate cylinder is restarted.
However, since the plate cylinder is gradually accelerated from a low speed to a medium speed and from a medium speed to a high speed to reach the printing speed, the above-described configuration cannot feed paper until the plate cylinder reaches the printing speed, There is a problem that the printing time increases.

Further, there are many types of paper used in a stencil printing machine, for example, thin paper such as reprinted paper or high-quality 45 kg paper, standard paper such as copy paper or high-quality 55 kg paper, and thick paper such as envelopes or high-quality 180 kg paper. Etc. When these papers are fed at a constant feed speed by a pair of registration rollers,
In the case of thin paper, there is a risk of tearing, and in the case of thick paper, there is a risk of slipping or peeling.

The present invention solves each of the above-mentioned problems, and enables printing of a plurality of types of paper, stencil printing capable of mass printing in a short time without causing an increase in space and cost. The purpose is to provide the device.

[0010]

According to the first aspect of the present invention,
A porous cylindrical plate cylinder, a multi-stage paper feeder having a plurality of paper storage units and capable of feeding a plurality of types of printing paper, and a pressing member for pressing the printing paper against the outer peripheral surface of the plate cylinder, Selecting means for selecting one of the paper storage units at the time of printing, and transferring the printing paper fed from the paper storage unit selected by the selection means between the plate cylinder and the pressing member A stencil printing apparatus having a pair of registration rollers for feeding the paper toward the paper storage unit, wherein the paper storage unit detects the size of the printing paper stored in the paper storage unit, the paper storage unit provided for each paper storage unit, the paper storage unit Paper presence / absence detecting means provided for each paper storage unit for detecting the presence / absence of the print paper stored in the paper storage unit, and the paper storage time of the printing paper from the paper storage unit to the pair of registration rollers. Remembered for each copy Storage means, and the paper size detection means and the paper presence / absence detection that the print paper of the same size as the print paper stored in the paper storage section selected by the selection means is stored in another paper storage section. Means for detecting, and when the paper presence / absence detection means detects that there is no print paper in the paper storage section selected by the selection means during the printing operation, the paper storage section is connected to the other paper storage section. While automatically switching, the operation of the plate cylinder, the pressing member, and the registration roller pair is performed based on the feeding time of the printing paper from the paper storage unit to the registration roller pair stored in the storage unit. And control means for controlling.

According to a second aspect of the present invention, there is provided a porous cylindrical plate cylinder, a main paper feed tray for storing printing paper, and a main paper feed tray which is provided substantially on the same plane as the main paper feed tray. A paper feeder having an auxiliary paper tray for storing print paper of the same size, and a transfer unit for collectively transferring the print paper stored in the auxiliary paper tray to the main paper tray;
A pressing member that presses the printing paper against the outer peripheral surface of the plate cylinder; and a registration roller pair that sends the printing paper fed from the paper feeding device toward between the plate cylinder and the pressing member. In the stencil printing apparatus, paper presence / absence detection means provided in each of the main paper supply tray and the auxiliary paper supply tray for detecting the presence or absence of the printing paper stored in the main paper supply tray and the auxiliary paper supply tray, A storage unit that stores a feed time of the printing paper from the auxiliary paper tray to the registration roller pair, and the paper presence / absence detection unit detects that the printing paper is stored in the auxiliary paper tray. If it is detected by the paper presence / absence detecting means that there is no printing paper in the main paper feeding tray during a printing operation, the printing paper stored in the auxiliary paper feeding tray is transferred by the transfer means. The sheet cylinder is fed after being transferred to the main sheet feeding tray, and the plate cylinder and the press are pressed based on the feeding time of the printing sheet from the auxiliary sheet feeding tray to the registration roller pair stored in the storage unit. And a control unit for controlling the operation of the member and the pair of registration rollers.

According to a third aspect of the present invention, there is provided a multi-stage paper feeding device having a porous cylindrical plate cylinder, a plurality of paper storage portions, and capable of feeding a plurality of types of printing paper, and A pressing member that presses against the outer peripheral surface of the cylinder, a selection unit that selects one of the paper storage units during printing, and the printing paper fed from the paper storage unit selected by the selection unit. In a stencil printing apparatus having a pair of registration rollers for feeding between the plate cylinder and the pressing member, the size of the printing paper stored in the paper storage unit is detected.
Paper size detection means provided for each paper storage unit,
Detecting the presence or absence of the printing paper stored in the paper storage unit, paper presence / absence detection means provided for each paper storage unit, and feeding time of the printing paper from the paper storage unit to the registration roller pair For each of the paper storage units, and at least one of the paper storage units is substantially flush with the main paper tray and the main paper tray for storing the printing paper. An auxiliary paper tray that is provided above and stores print paper of the same size as the print paper stored in the main paper tray, and print paper in the auxiliary paper tray is transferred to the main paper tray collectively Transfer means, and the sheet size detection means that the printing paper of the same size as the printing paper stored in the paper storage unit selected by the selection means is also stored in another paper storage unit. Paper presence detection When the paper tray having the main paper feed tray is selected by the selection means and the absence of print paper in the main paper feed tray is detected during the printing operation, the paper storage The plate cylinder, the pressing member, and the resist are automatically switched to another sheet storage unit based on the feeding time of the printing sheet from the sheet storage unit to the pair of registration rollers stored in the storage unit. Control means for controlling the operation of each roller pair and thereafter transferring the printing paper in the auxiliary paper feed tray to the main paper feed tray by the transfer means.

According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first, second, or third aspect, the rotational peripheral speed of the pair of registration rollers is different depending on the type of the printing paper. Features.

[0014]

FIG. 1 is a schematic view of a stencil printing apparatus employing an embodiment of the present invention. Referring to FIG.
Is mainly composed of an image reading unit 2, a sheet feeding unit 3 as a multi-stage sheet feeding device, a plate making unit 4, a printing unit 5, a sheet discharging unit 6, a plate discharging unit 7, and a control unit 8.

The image reading section 2 is provided on the upper part of the housing 9. The image reading unit 2 includes a contact glass 10 on which a document is placed, a document placing table 11 on which a document is placed, a pair of document transport rollers 12 for transporting the document, and a document transport roller 1.
3. guide plates 14, 15 for guiding the conveyed document;
A document transport belt 16 for transporting a document along the contact glass 10, a switching plate 17 for switching a discharge direction of a read document, a document discharge table 18 on which the read document is discharged, a reflection for scanning and reading a document image. Mirror 19,2
0 and fluorescent lamp 21, lens 2 for converging the scanned document
2. It mainly comprises an image sensor 23 such as a CCD for processing a focused image.

In the above-described configuration, the document placing table 11, the document transport roller pair 12, the document transport roller 13, the guide plates 14, 15, the document transport belt 16, the switching plate 17, and the document discharge table 18 ADF provided integrally
The ADF unit 24 is provided so as to be able to freely contact and separate from the contact glass 10.

The paper feed unit 3 is provided below the housing 9. The paper supply unit 3 includes a first paper supply tray 28 as a main paper supply tray and a second paper supply tray 29 as an auxiliary paper supply tray, which are paper storage units capable of stacking print papers P1 and P2 of the same size. A third paper feed tray 30 as a paper storage unit capable of stacking print paper P3 of a size, a fourth paper feed tray 25 as a paper storage unit capable of manually feeding print paper P4, and a first paper feed tray A sheet moving member 31 for moving the printing paper P2 on the second paper feeding tray 29 to the first paper feeding tray 28 in a lump when the printing paper P1 on the printing paper P 28 is used up; Paper roller 32, paper feed roller 33 for feeding printing paper P3, paper feeding roller 26 for feeding printing paper P4, push-up member 34 for pressing printing paper P1 against paper feeding roller 32, and paper feeding roller for printing paper P3 Press to press on 33 The lower member 35, the printing paper P1 1
A pair of separation rollers 37 for separating the sheets P, a pair of separation rollers 38 for separating the printing paper P3 one by one, and a pair of printing paper P4
Roller pair 27, paper transport roller pairs 39 and 40, paper transport roller group 41, registration roller pair 42, and the like, which separate papers one by one. The paper feed unit 3 is configured to be able to pull out the second paper feed tray 29 while the stencil printing apparatus 1 is operating, for example, as disclosed in Japanese Patent Application Laid-Open No. 5-221536. The paper transport path of the four paper feed tray 25 is provided substantially linearly so that special paper such as thick paper and envelopes can be fed.

Each of the paper feed trays 28, 29, 30, 25 has a pair of paper feed side fences 28a, 29a, 30a, which guide the printing paper P1, P2, P3, P4 in the width direction.
25a are provided respectively. Each paper feed side fence 28a, 29a, 30a, 25a is
8, 29, 30, and 25 are detachably supported by screws, fitting, and the like.

Above the first paper feed tray 28, the first sheet of paper P1 pushed by the pushing member 34 comes into contact with the first sheet of paper P1.
First paper presence sensor 36 as paper presence detection means for detecting the presence or absence of print paper P1 on paper feed tray 28
However, below the first paper feed tray 28, there is provided a first paper size detecting means as a paper size detecting means, which comprises a plurality of light-shielded sensors and detects the size of the print paper P1 based on the sensor light-shielded by the print paper P1. A paper size detection sensor 45 is provided.

Below the second paper supply tray 29, a second paper presence / absence detection sensor 43 as paper presence / absence detection means for detecting the presence / absence of the print paper P2 on the second paper supply tray 29, and the size of the print paper P2 And a second paper size detecting sensor 46 as a paper size detecting means for detecting the paper size. The second paper presence / absence detection sensor 43 is a reflection type sensor, and has a well-known configuration for detecting the presence / absence of the printing paper P2 from a hole (not shown) provided on the second paper feed tray 29. Reference numeral 46 denotes a configuration similar to that of the first paper size detection sensor 45.

Above the third paper feed tray 30, the third paper presence / absence detecting means for detecting the presence / absence of the print paper P3 on the third paper supply tray 30 in the same manner as the first paper presence / absence detection sensor 36 A detection sensor 44 is provided below the third paper feed tray 30.
A third paper size detection sensor 47 is provided as paper size detection means for detecting the size of the printing paper P3 in the same manner as described above.

Below the fourth paper feed tray 25, there is a fourth paper presence / absence detection means for detecting the presence / absence of the print paper P4 on the fourth paper supply tray 25, similarly to the second paper presence / absence detection sensor 43. A detection sensor 55 and a fourth paper size detection sensor 56 as paper size detection means for detecting the size of the printing paper P4 in the same manner as the first paper size detection sensor 45 are provided.

Each of the paper size detecting sensors 45, 46, 47, and 56 as the paper size detecting means has the same configuration as that described in, for example, FIG. 2 and FIG. 3 of JP-A-10-1254. .

One of the separation roller pairs 37, 38, and 27 is driven to rotate by paper feed motors 57, 58, and 59, and the other roller rotates together with the one roller. Each of the paper feed rollers 32, 33, and 26 receives the rotational driving force from the paper feed motors 57, 58, and 59 by a driving force transmitting means such as a belt or a pulley, and synchronizes with the corresponding separation roller pair 37, 38, and 27. And is driven to rotate. One of the registration roller pairs 42 is rotationally driven by a registration motor 68, and the other roller rotates together with the one roller. The registration motor 68 is a gear motor, and can switch between low speed, medium speed, and high speed.

In FIG. 1, a plate making section 4 is provided above a sheet feeding section 3.
Are arranged. The plate making section 4 includes a support member 49 that supports a master roll 48a formed by winding the master 48 into a roll shape, and a thermal head 5 that heats and punches the master 48.
0, a platen roller 51 for transporting the master 48 while pressing it against the thermal head 50, a cutting means 52 for cutting the master 48, a pair of master transport rollers 53 and 54 for transporting the master 48, and the like. The plate making unit 4 is configured as an integrated unit, and is provided detachably with respect to the housing 9.

The master roll 48a has a core 48b rotatably supported by a support member 49. A platen roller 51 driven to rotate by a stepping motor (not shown) is pressed against the thermal head 50 at a predetermined pressure by a platen roller contacting / separating means (not shown).
Are selectively positioned at a pressure contact position shown by a solid line and a separation position shown by a two-dot chain line in FIG. The cutting means 52 composed of an upper blade 52a that is a movable blade and a lower blade 52b that is a fixed blade has an upper blade 52a
This is a well-known configuration that rotates or moves up and down with respect to 2b.

A printing section 5 is provided on the left side of the plate making section 4. The printing unit 5 includes a printing cylinder P (printing paper P1, P2, P) on the outer circumferential surface of the printing drum 60, the ink supply unit 61, and the printing drum 60.
3, and P4 are collectively referred to as the printing paper P).

A plate cylinder 60 formed by winding a plurality of layers of a resin or metal mesh mesh screen around a porous support cylinder is rotatably supported by a support shaft 63 also serving as an ink supply pipe. Is fixed to the flange that does not
The driving force from the plate cylinder driving motor 69 is transmitted to rotate the plate cylinder. When the plate cylinder 60 is driven to rotate, the plate cylinder drive motor 69 gradually increases in speed to a low speed, a medium speed and a high speed. The plate cylinder drive motor 69 is provided with an encoder (not shown) so that the current position can be detected by detecting the position from the home position. The plate cylinder 60 is provided detachably with respect to the housing 9, and a clamper 64 for holding the leading end of the master 48 is provided on the outer peripheral surface thereof. The clamper 64 is opened and closed by a not-shown clamper opening / closing means when the plate cylinder 60 reaches a predetermined position.

Inside the plate cylinder 60, an ink supply means 61 is provided. The ink supply means 61 mainly includes a support shaft 63, an ink roller 65, a doctor roller 66, and the like. The ink roller 65 rotatably supported by a side plate (not shown) fixed to the support shaft 63 receives a driving force from a driving force transmitting means (not shown) such as a gear or a belt and is driven to rotate clockwise in the drawing. You. In the vicinity of the ink roller 65, a doctor roller 66 whose outer peripheral surface is arranged close to the outer peripheral surface of the ink roller 65 is provided.
Are arranged in parallel with the ink roller 65. The ink in the ink pool 67 supplied in a wedge-shaped cross section to the vicinity of the ink roller 65 and the doctor roller 66 is stretched when passing through the gap between the ink roller 65 and the doctor roller 66, and the outer periphery of the ink roller 65 It is supplied in a thin film on the surface.

A press roller 62 is provided below the plate cylinder 60. A press roller 62 slidably and rotatably supported by a side plate (not shown) of the housing 9 is oscillated by a cam (not shown) or the like, and the outer peripheral surface thereof is provided so as to be able to freely contact and separate from the outer peripheral surface of the plate cylinder 60. Have been. The press roller 62 is moved by a biasing means such as a spring (not shown).
, And is held at the separated position shown in the figure by locking means (not shown) at the time of separation. The locking means (not shown) is released by the operation of the solenoid 70, and when the solenoid 70 is energized, the press roller 62 presses against the outer peripheral surface of the plate cylinder 60.

A paper discharge unit 6 is disposed on the left side of the printing unit 5. The paper discharge unit 6 includes a peeling claw 71, guide plates 72 and 73,
It is mainly composed of a paper discharge conveyance member 74, a paper discharge table 75, and the like. A peeling claw 71 for peeling the printed printing paper P from the outer peripheral surface of the plate cylinder 60 is rotatably supported by a side plate (not shown) of the housing 9, and has a tip thereof with respect to the outer peripheral surface of the plate cylinder 60. It is provided to be able to approach and separate freely. Guide plates 72 and 73 fixed to a side plate (not shown) of the housing 9 guide the conveyance of the printed printing paper P peeled by the peeling claws 71. Paper discharge transport member 7 including drive roller 76, driven roller 77, endless belt 78, and suction fan 79
4 is an endless belt 78 by the suction force of the suction fan 79.
The printing paper P is held thereon, and the printing paper P is transported in the direction of the arrow in FIG. A paper discharge tray 75 on which the print paper P conveyed by the paper discharge conveyance member 74 is loaded has a paper discharge tray 80 for loading paper, a pair of paper discharge side fences 81, and a paper discharge end fence 83. The fences 81 and 83 are manually positioned at predetermined positions according to the size of the paper used.

A plate discharging section 7 is disposed above the sheet discharging section 6. The plate discharging section 7 includes an upper plate discharging member 88, a lower plate discharging member 89,
It mainly comprises a plate discharge box 90, a compression plate 91, and the like. The upper plate discharging member 88 includes a driving roller 92, a driven roller 93, and an endless belt 94.
2 rotates clockwise in FIG. 1 to move the endless belt 94 in the direction of the arrow in the figure. Lower plate discharging member 8
9 also includes a driving roller 95, a driven roller 96, and an endless belt 97 in the same manner as the upper plate discharging member 88. When the driving roller 95 rotates counterclockwise in FIG. Go to
The lower plate discharging member 89 is movably provided by a moving means (not shown). The lower plate discharging member 89 is provided on a used master 98 having the position shown in FIG. 1 and the outer peripheral surface of the drive roller 95 wound on the outer peripheral surface of the plate cylinder 60. It is selectively positioned at a contact position. The compression plate 91 for pushing the used master 98 into the inside of the plate discharge box 90 is vertically movably supported by a lifting means (not shown). The upper plate discharging member 88, the lower plate discharging member 89, the plate discharging box 90, and the compression plate 91 are integrally formed, and are provided detachably with respect to the housing 9.

FIG. 2 shows an operation panel of the stencil printing machine 1. Operation panel 8 provided on the upper front surface of housing 9
Reference numeral 2 denotes a plate making start key 84, a printing start key 85, a trial printing key 86, a stop key 87, a ten key 99, an enter key 100, a clear key 101, a program key 102, a mode setting key 103, a mode clear key 104, An enlargement / reduction key 105, a printing speed setting key 106, a tray selection key 107 as a selection means, a paper selection key 108, a display device 109 including a 7-segment LED, a display device 110 including an LCD, a display device 111 such as a jam including LEDs, It has tray display means 112 composed of LEDs for displaying the tray selected by the tray selection key 107, and paper type display means 113 for displaying the paper type selected by the paper selection key. The operation command from the operation panel 82 is output to the control unit 8.

The tray selection key 107 is depressed when selecting a tray to be used for printing.
Is switched to the first paper supply tray 28, the third paper supply tray 30, and the fourth paper supply tray 25. At the time of this switching, each paper size detection sensor 45, 4
The size of the printing paper stored in each tray is displayed on the display device 110 based on the signals from 7, 56. The tray display unit 112 displays the tray selected when the tray selection key 107 is pressed. In this embodiment, “Tray 1” indicates the first paper feed tray 28, “Tray 2” indicates the third paper feed tray 30, and “Tray 3” indicates the fourth paper feed tray 25.

The paper selection key 108 is depressed when setting the type of the printing paper P used for printing, and every time it is depressed, the speed of the registration motor 68 stored in the storage means described later is switched. The paper type display unit 113 displays the paper type selected when the paper selection key 108 is pressed. In this embodiment, when the "standard" corresponding to the standard paper is selected, the registration motor 68 is set to the high speed, when the "thick paper" corresponding to the thick paper is selected, the registration motor 68 is set to the low speed, and the "thin paper" corresponding to the thin paper is set. Is selected, the registration motor 68 is switched to the medium speed.

A control unit 8 is provided below the inside of the housing 9. The control unit 8 includes a CPU 11 as shown in FIG.
5, a control unit 114 which is a well-known microcomputer having a RAM 116, a ROM 117, an I / O expander 118 and the like, and controls the operation of the stencil printing apparatus 1.

Output signals from the sensors and the operation panel 82 are input to the CPU 115. Each input signal is subjected to arithmetic processing based on the operation program stored in the ROM 117, and the image reading unit 2, the sheet feeding unit 3, the plate making unit 4,
It is output as an operation signal to each drive circuit that controls the printing unit 5, the paper discharge unit 6, and the plate discharge unit 7, and is also output as a display signal to the operation panel 82.

An operation program called from the ROM 117 by the CPU 115 is temporarily written into the RAM 116, and the operation program is rewritten by an input from the operation panel 82. Also, the RAM 116
ROM 117 when a continuous sheet feeding state, which will be described later, is enabled.
Is written, and the CPU 115 calculates based on this program and controls the operation of each actuator so as to minimize the printing time.

The ROM 117 as a storage means includes a plurality of operation programs for operating each actuator of the stencil printing apparatus 1, and a continuous paper feed when print papers of the same size are stored in a plurality of paper feed trays. And a registration roller pair from each paper tray
2, the peripheral speed of the plate cylinder 60 corresponding to the printing speed, the set peripheral speed reaching time, and the like are stored.

The stencil printing apparatus 1 based on the above configuration will be described below.
Will be described. First, the first sheet feed tray 28 and the second
A4 standard paper is stored in the third tray 30
A3 standard paper is stored in the fourth paper feed tray 25, and B4 standard paper is stored in the fourth paper feed tray 25.
A case where printing is performed on four standard sheets will be described.

Prior to the plate making operation, the operator places a document to be printed on the document placing table 11 and presses a tray selection key 107 on the operation panel 82 to select a tray to be used. The paper selection key 108 is pressed according to the type of the paper P. Tray display means 1
Reference numeral 12 turns on the LED of "Tray 3", and the paper type display means 113 turns on the LED of "Standard". At this time, the enlargement / reduction key 105 is pressed as needed, and the scale of the print image with respect to the original image is appropriately determined.

Thereafter, when the operator presses the plate making start key 84, the image reading section 2 reads the document image, and the read image is sent to the control means 114 as an image data signal. Further, an operation signal is also sent to the paper supply unit 3, and a lifting unit (not shown) raises the fourth paper supply tray 25, and the uppermost printing paper P <b> 4 is pressed against the paper supply roller 26.

In parallel with the image reading operation of the image reading section 2, the plate discharging section 7 performs a plate discharging operation of peeling the used master 98 from the outer peripheral surface of the plate cylinder 60. The plate cylinder 60 around which the used master 98 is wound on the outer peripheral surface is started to rotate counterclockwise in FIG. When the control unit 114 determines that the rear end of the used master 98 wound on the outer peripheral surface of the plate cylinder 60 has reached a predetermined plate discharging position corresponding to the drive roller 95, the command from the control unit 114 is issued. As a result, the moving means and the driving means (not shown) operate, and the driving rollers 92 and 95
Is rotated, and the lower plate discharging member 89 moves to the plate cylinder 60 side. When the outer peripheral surface of the drive roller 95 comes into contact with the used master 98 on the plate cylinder 60, the plate cylinder 60 continues to rotate in the counterclockwise direction, and the use rolled up in contact with the drive roller 95. The finished master 98 is a lower plate discharging member 89
And the upper plate discharging member 88, and is separated from the outer peripheral surface of the plate cylinder 60. The peeled used master 98 is conveyed by the lower plate discharging member 89 and the upper plate discharging member 88 and discarded in the plate discharging box 90, and then compressed by the compression plate 91.

From the outer peripheral surface of the plate cylinder 60, the used master 98 is used.
Are completely removed, the plate cylinder 60 is further rotated and positioned at the plate feeding position. Thereafter, an operation signal is sent from the control means 114 to the opening / closing means (not shown), the clamper 64 is opened, and the plate cylinder 60 enters a plate feeding standby state, thereby completing the plate discharging operation.

After the completion of the plate discharging operation, a plate making operation is performed. When the plate cylinder 60 enters the plate-supply standby state, a stepping motor (not shown) is operated by an operation signal from the control unit 114, and the platen roller 51 and the master transport roller pairs 53 and 54 are driven to rotate. Is pulled out. The drawn-out master 48 is subjected to heat perforation plate making by the thermal head 50.

The master 48 thus made is conveyed to the clamper 64. Then, according to the number of steps of a stepping motor (not shown), the tip of the master 48 is
That the control means 1 has reached the predetermined position
When the determination is made by 14, an operation signal is sent to the opening / closing means (not shown), the clamper 64 is closed, and the leading end of the master 48 is held on the plate cylinder 60.

Thereafter, the plate cylinder 60 is rotated clockwise at the same peripheral speed as that of the master 48, and
8 is carried out on the plate cylinder 60. When the control unit 114 determines that plate making for one plate has been completed based on the number of steps of a stepping motor (not shown), the rotation of the platen roller 51 and the master transport roller pairs 53 and 54 is stopped, and the upper blade 52a is turned off. Move to Master 4
8 is cut. The cut master 48 is pulled out by the rotation operation of the plate cylinder 60, and when the plate cylinder 60 reaches the home position again, the plate cylinder 60 stops and the winding operation is completed.

Subsequent to the winding operation, a printing operation is performed. When the plate cylinder 60 stops at the home position, an operation signal is sent from the control unit 114 to rotate the plate cylinder 60 at a low speed, and at the same time, the sheet feed roller 26, the separation roller pair 27, the sheet conveyance roller pair 40, and the sheet conveyance. Roller group 4
1 are rotationally driven. Due to the rotation of the paper feed roller 26, the printing paper P stacked on the fourth paper feed tray 25
After being pulled out and separated and fed by the separation roller pair 27, its tip is held in the registration roller pair 42.

When the leading end of the image area of the master 48 wound around the plate cylinder 60 reaches a position corresponding to the press roller 62, an operation signal is sent from the control means 114 to the registration motor 68 to rotate the registration roller pair 42. Then, the printing paper P4 is fed between the plate cylinder 60 and the press roller 62. The control means 114 includes the registration roller pair 4
2 is transmitted to the solenoid 70 holding the press roller 62 following the operation signal to the press roller 62.
Rocks.

The printing paper P 4 fed by the registration roller pair 42 is pressed by the press roller 62 to the plate cylinder 60.
Is pressed by the master 48 wound around. This pressing operation causes the press roller 62, the printing paper P4, and the master 48 to move.
Is pressed against the outer peripheral surface of the plate cylinder 60, and the ink supplied to the inner peripheral surface of the plate cylinder 60 by the ink roller 65 is applied to the plate cylinder 6.
After exuding from the opening on the outer peripheral surface of the zero and the mesh screen, it is filled in the gap between the outer peripheral surface of the plate cylinder 60 and the master 48 and transferred to the printing paper P4 through the perforated part of the master 48.

The printing paper P4 on which the image has been formed is peeled off from the outer peripheral surface of the plate cylinder 60 at the tip of the peeling claw 71 and guided between the guide plates 72 and 73. The endless belt 78 is drawn by the suction force of the suction fan 79. The sheet is conveyed to the left while being attracted to the upper surface of the sheet, and is discharged onto the sheet discharge tray 80. By this series of steps, the so-called printing operation is completed, and the stencil printing machine 1 enters a printing standby state.

When the operator presses the trial printing key 86 in the stencil printing machine 1 in which the above-described document reading, plate discharging, plate making, and plate making operations have been completed and are in a printing standby state, the same as in the plate making operation. The printing paper P4 is fed from the fourth paper feed tray 25 to the registration roller pair 4
2 and the plate cylinder 60 is driven to rotate at high speed. The registration roller pair 42 feeds the printing paper P4 between the plate cylinder 60 and the press roller 62 that are rotating at a high speed at the same timing as the printing operation. The fed printing paper P4 is pressed against the master 48 wound around the plate cylinder 60 by the press roller 62 to transfer the ink, and a print image is formed on the upper surface thereof. And is conveyed leftward by the paper discharge conveyance member 74 and discharged onto the paper discharge tray 80. The plate cylinder 60 returns to the home position again, and the test printing operation is completed.

After confirming the printing speed and the position of the print image by trial printing, adjusting these with various keys on the operation panel and performing trial printing as needed, the number of prints is displayed on the display device 109 with the ten keys 99. When the print start key 85 is pressed after the number is set, the printing operation is performed.

When the operator presses the print start key 85 in the stencil printing apparatus 1 in the printing standby state, a print start signal is input to the control means 114.
Upon receiving the print start signal, the control unit 114
Based on the signal from the paper presence / absence detection sensor 55, it is confirmed that the print paper P4 is stored on the fourth paper feed tray 25. Subsequently, the control unit 114 recognizes the sheet size of the selected tray “Tray 3” based on the signal from the fourth sheet size detection sensor 56, and then determines the other trays “Tray 1” and “Tray 2”. Is determined based on signals from the first paper size detection sensor 45 and the third paper size detection sensor 47.

Then, after confirming that sheets of the same size are not stored, the control means 114 further sends a command to the registration motor 68 based on a signal from the sheet selection key 108 to shift the gear of the registration motor 68 at high speed. After that, an operation signal is sent to the paper feed motor 59. Thereafter, the printing paper P4 is continuously fed from the fourth paper supply tray 25 until the set number of papers reaches the set number, and the printing operation is performed in the same manner as in the test printing.

Next, A4 standard paper is stored in the first paper tray 28 and the second paper tray 29, and B4 standard paper is stored in the third paper tray 30 and the fourth paper tray 25, respectively.
A case in which the fourth paper feed tray 25 is selected and printing is performed on B4 standard paper will be described. As described above, the stencil printing machine 1 goes into a printing standby state through an image reading operation, a plate discharging operation, a plate making operation, a plate feeding operation, and a plate attaching operation.

Printing start key 85 by the operator
Is pressed, a print start signal is input to the control unit 114, and the control unit 114 that has received the signal recognizes the sheet size of “Tray 3”, and sheets of the same size are displayed in “Tray 1” and “Tray 2”. It is determined whether or not it is stored.

When it is confirmed that sheets of the same size are stored in the "tray 2", the continuous paper feeding program is called from the ROM 117 and written into the RAM 116, and the paper can be continuously fed to the display device 110. Is displayed. At this time, the RAM 116 stores the absence of paper on the fourth paper feed tray 25 as the fourth paper presence / absence detection sensor 5.
After the detection of No. 5, the paper feed is switched to the third paper feed tray, and the time until the printing paper P3 is fed from the third paper feed tray to the pair of registration rollers 42 is written. CP
U115 compares this time with the rotational peripheral speed of the plate cylinder 60 to determine whether to stop or continue the rotation of the plate cylinder 60. Further, the control means 114 operates the push-up member 35 to press the printing paper P3 against the paper feed roller 33.

Further, the control means 114 sends a command to the registration motor 68 based on a signal from the sheet selection key 108 to switch the gear of the registration motor 68 at a high speed, and thereafter sends an operation signal to the sheet feeding motor 59. Thereafter, the printing paper P4 is continuously fed from the fourth paper feed tray 25 until the set number of printing papers reaches the set number, and the printing operation is performed.

When the set number of prints is exhausted, if the print paper P4 remains on the fourth paper feed tray 25, the printing operation ends there, and the set number of prints is exhausted. Before the printing paper P on the fourth paper feed tray 25
When 4 runs out, the printing paper P3 is fed from the third paper feed tray 30.

If the rotation of the plate cylinder 60 is continued when the paper feed tray is switched, the control means 114 checks the position of the plate cylinder 60 based on a signal output from the encoder of the plate cylinder drive motor 69, Based on the time until the printing paper P3 is fed from the third paper feed tray 30 to the registration roller pair 42 and the position of the plate cylinder 60, the position of the master cylinder 48 wound around the plate cylinder 60 is adjusted in accordance with the leading end of the image area. An operation signal is sent to the registration motor 68 and the solenoid 70 to operate the registration roller pair 42 and the press roller 62.

Further, when the paper feed tray is switched, the plate cylinder 60
When the rotation of the plate cylinder 6 is stopped, the control means 114
The set peripheral speed arrival time of 0 and the time until the printing paper P3 is fed from the third paper feed tray 30 to the registration roller pair 42 are compared.
The operation signal is sent to the plate cylinder drive motor 69 at the timing when the plate cylinder 60 reaches the set peripheral speed just before
0 is rotationally driven. Thereafter, in the same manner as described above, an operation signal is sent to the registration motor 68 and the solenoid 70 in accordance with the leading end of the image area of the master 48 wound around the plate cylinder 60, and the registration roller pair 42 and the press roller 62 are operated.

The fourth paper supply tray 25 that has used up the printing paper P4 is lowered by the elevating means (not shown) to be in a paper replenishable state. When the printing paper P4 is replenished to the fourth paper supply tray 25 in this state, The fourth paper presence / absence detection sensor 55 detects the replenishment of the paper, and the elevating means (not shown) operates, so that the print paper P4 is pressed against the paper feed roller 26 and the paper can be fed again from the fourth paper feed tray 25. . Similarly,
The third paper feed tray 30, which has used up the printing paper P3, is also lowered by the push-up member 35 being operated in the opposite direction to the upward movement, so that the paper can be replenished. When the printing paper P3 is replenished, a signal from a sensor (not shown) is output. Push-up member 3 based on
5, the printing paper P3 is pressed against the paper feed roller 33. As described above, any one of the third paper feed tray 30 and the fourth paper feed tray 25 is always in a paper replenishable state, so that a large amount of printing can be performed.

It should be noted that the paper supply possible state and the paper possible state may be displayed on the display device 110 in accordance with the change. In addition, when switching the paper feed tray, the determination of whether to stop or continue the rotation of the plate cylinder 60 is made more easily by pressing the plate cylinder 60 without pressing by the press roller 62 than by temporarily stopping the plate cylinder 60. This is to determine whether the spinning or idling can shorten the printing time. Therefore, each paper feed tray 28, 29, 3
Each printing paper P1, P2, P3, P loaded on 0, 25
4 is configured so that the control unit 114 can grasp the number of sheets loaded in advance (by the remaining paper amount detection unit or input by an operator, etc.), so that when the paper feed tray is switched, the paper feed roller of the next paper feed tray is started. Can be controlled earlier, and continuous printing can be performed without causing the plate cylinder 60 to perform the idling operation.

Next, A4 standard paper is stored in the first paper tray 28 and the second paper tray 29, and B4 standard paper is stored in the third paper tray 30 and the fourth paper tray 25, respectively.
A case in which the first paper feed tray 28 is selected and printing is performed on A4 standard paper will be described. As described above, the stencil printing machine 1 goes into a printing standby state through an image reading operation, a plate discharging operation, a plate making operation, a plate feeding operation, and a plate attaching operation.

Print start key 85 by the operator
Is pressed, a print start signal is input to the control unit 114, and upon receiving the signal, the control unit 114 recognizes the paper size of “Tray 1”, and sheets of the same size are displayed in “Tray 2” and “Tray 3”. It is determined whether or not paper of the same size is stored in the second paper feed tray 29 as well as whether or not the paper is stored.

When it is confirmed that the same size paper is stored in the second paper feed tray 29, the continuous paper feed program is called from the ROM 117 and written into the RAM 116, and the continuous paper feed ready state is displayed on the display device 110. Is displayed. At this time, the RAM 116 has
After the first sheet presence sensor 36 detects that there is no sheet on the first sheet tray 28, the first sheet tray 28 descends, and the sheet moving member 31 moves the printing sheet P2 on the second sheet tray 29 to the second position. After the first paper feed tray 28 is moved above the first paper feed tray 28, the first paper feed tray 28 is raised, and the time until the printing paper P2 is fed from the first paper feed tray 28 to the registration roller pair 42 is written. The CPU 115 determines this time and the plate cylinder 6
It is determined whether the rotation of the plate cylinder 60 is stopped or continued by comparing the rotation peripheral speed with zero.

Further, the control means 114 sends a command to the registration motor 68 based on a signal from the sheet selection key 108 to switch the gear of the registration motor 68 at high speed, and then sends an operation signal to the sheet feeding motor 57. Hereinafter, the printing paper P1 is continuously fed from the first paper feed tray 28 until the set number of papers reaches the set number, and the printing operation is performed.

When the set number of prints is exhausted, if the print paper P1 remains on the first paper feed tray 28, the printing operation ends there, and the set number of prints is exhausted. Before the printing paper P on the first paper tray 28,
When 1 disappears, the printing paper P2 is moved from the second paper feed tray 29.

When the rotation of the plate cylinder 60 is continued when the paper feed tray is switched, the control means 114 checks the position of the plate cylinder 60 based on the signal output from the encoder of the plate cylinder drive motor 69, The time until the printing paper P2 is fed from the second paper tray 29 to the registration roller pair 42 (the paper moving member 31 operates after the first paper tray 28 is lowered, and the first paper tray 28 is raised. From the time when the paper feed roller 32 rotates until the printing paper P2 is fed to the registration roller pair 42) and the position of the plate cylinder 60, the leading edge of the image area of the master 48 wound around the plate cylinder 60 Resist motor 68 and solenoid 7
The operation signal is sent to 0 to operate the registration roller pair 42 and the press roller 62.

When the sheet tray is switched, the plate cylinder 60
When the rotation of the plate cylinder 6 is stopped, the control means 114
The set peripheral speed arrival time of 0 and the time until the printing paper P2 is fed from the second paper feed tray 29 to the registration roller pair 42 are compared.
The operation signal is sent to the plate cylinder drive motor 69 at the timing when the plate cylinder 60 reaches the set peripheral speed just before
0 is rotationally driven. Thereafter, in the same manner as described above, an operation signal is sent to the registration motor 68 and the solenoid 70 in accordance with the leading end of the image area of the master 48 wound around the plate cylinder 60, and the registration roller pair 42 and the press roller 62 are operated.

The first paper tray 28 that has used up the printing paper P1 is lowered by the push-up member 34 being operated in the opposite direction to the upward movement, and the printing paper P2 on the second paper tray 29 is moved by the paper moving member 31. The printing paper P2 is raised by the push-up member 34 and is
2 is pressed. Thereby, the above-mentioned Japanese Patent Application Laid-Open No.
Similarly to the technology disclosed in Japanese Patent No. 1536, it is possible to supply paper to the second paper feed tray 29 during the printing operation.
Mass printing is possible.

Next, A4 standard paper is stored in the first paper tray 28, the second paper tray 29, and the third paper tray 30, and B4 standard paper is stored in the fourth paper tray 25, respectively.
A case in which the first paper feed tray 28 is selected and printing is performed on A4 standard paper will be described. As described above, the stencil printing machine 1 goes into a printing standby state through an image reading operation, a plate discharging operation, a plate making operation, a plate feeding operation, and a plate attaching operation.

The print start key 85 by the operator
Is pressed, a print start signal is input to the control unit 114, and upon receiving the signal, the control unit 114 recognizes the paper size of “Tray 1”, and sheets of the same size are displayed in “Tray 2” and “Tray 3”. It is determined whether or not paper of the same size is stored in the second paper feed tray 29 as well as whether or not the paper is stored.

When it is confirmed that sheets of the same size are stored in the “tray 2” and the second paper feed tray 29,
The continuous paper feed program is called from the ROM 117 and R
The data is written into the AM 116 and the display 110 indicates that the continuous paper feeding is possible. At this time, R
After the first paper presence / absence detection sensor 36 detects that there is no paper on the first paper feed tray 28,
The sheet is switched to the paper feed tray 30, and the time until the printing paper P3 is fed from the third paper feed tray to the registration roller pair 42 is written. The CPU 115 compares this time with the rotational peripheral speed of the plate cylinder 60 to determine whether to stop or continue the rotation of the plate cylinder 60. The control means 11
4 operates the push-up member 35 to press the printing paper P3 against the paper feed roller 33.

Further, the control means 114 sends a command to the registration motor 68 based on a signal from the sheet selection key 108 to switch the gear of the registration motor 68 at a high speed, and thereafter sends an operation signal to the sheet feeding motor 57. Hereinafter, the printing paper P1 is continuously fed from the first paper feed tray 28 until the set number of papers reaches the set number, and the printing operation is performed.

If the printing paper P1 remains on the first paper feed tray 28 when the set number of prints is exhausted, the printing operation ends there, and the set number of prints is exhausted. Before the printing paper P on the first paper tray 28,
When 1 is gone, the printing paper P3 is fed from the third paper feed tray 30.

When the rotation of the plate cylinder 60 is continued when the paper feed tray is switched, the master 48 on the plate cylinder 60 is moved in the same manner as described above.
When an operation signal is sent to the registration motor 68 and the solenoid 70 in accordance with the leading end of the image area to operate the registration roller pair 42 and the press roller 62, and the rotation of the plate cylinder 60 is stopped when the paper feed tray is switched, Immediately before the printing paper P3 reaches the registration roller pair 42, the plate cylinder 60
Starts the plate cylinder 60 at the timing when the peripheral speed reaches the set peripheral speed, and then sends an operation signal to the registration motor 68 and the solenoid 70 in accordance with the leading end of the image area of the master 48 on the plate cylinder 60 to send the registration roller pair 42 and the press. The roller 62 is operated.

After the first paper supply tray 28 that has used up the printing paper P1 is lowered, the printing paper P
2, the printing paper P2 is raised again, and the printing paper P2 is pressed against the paper feeding roller 32 to be in a paper-feedable state. Printing paper P
The third paper feed tray 30, which has used up the third paper 3, is also lowered to be in a paper replenishable state. When the printing paper P3 is replenished, it rises to be in a paper replenishable state. As described above, since one of the second paper feed tray 29 and the third paper feed tray 30 is always in a paper replenishable state, a large amount of printing can be performed.

In the above-described embodiment, the case where sheets of the same size and the same type are stored in a plurality of sheet feed trays has been described. However, when sheets of different types are used, a plurality of trays to be used before the start of plate making are used. Specify the paper type for each specified tray, and set the registration motor 6
The gear 8 may be switched.

[0081]

According to the present invention, large-volume printing can be performed without connecting a large-volume paper feeder, and an increase in installation space and an increase in cost can be prevented. Also,
Since the operation of the plate cylinder, the registration roller pair and the press roller is controlled according to the paper feeding time from each paper storage unit,
Printing time can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a main part of a stencil printing apparatus used in an embodiment of the present invention.

FIG. 2 is a diagram showing an operation panel used in one embodiment of the present invention.

FIG. 3 is a block diagram of control means used in one embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 stencil printing device 3 multi-stage paper feeder (paper feed unit) 25 paper storage unit (fourth paper feed tray) 28 main paper feed tray (first paper feed tray) 29 auxiliary paper feed tray (second paper feed tray) 30 Paper storage unit (third paper feed tray) 36 Paper presence detection means (first paper presence detection sensor) 42 Registration roller pair 43 Paper presence detection means (second paper presence detection sensor) 44 Paper presence detection means (third paper presence Detection sensor) 45 paper size detection means (first paper size detection sensor) 46 paper size detection means (second paper size detection sensor) 47 paper size detection means (third paper size detection sensor) 55 paper presence detection means (fourth Paper presence detection sensor) 56 Paper size detection means (fourth paper size detection sensor) 60 Plate cylinder 62 Pressing member (press roller) 107 selection Stage (tray selection key) 114 control unit 117 storage unit (ROM) P, P1, P2, P3, P4 printing paper

Claims (4)

[Claims] 1. A multi-stage paper feeder having a porous cylindrical plate cylinder, a plurality of paper storage units, and capable of feeding a plurality of types of printing paper, and pressing the printing paper against the outer peripheral surface of the plate cylinder. Pressing member, selecting means for selecting one of the respective paper storage sections at the time of printing, and pressing the printing paper fed from the paper storage section selected by the selecting means with the plate cylinder. A stencil printing apparatus having a pair of registration rollers for sending the sheet to a member, a sheet size detecting unit provided for each of the sheet storage units, for detecting a size of the printing paper stored in the sheet storage unit, A paper presence / absence detection means provided for each paper storage unit for detecting the presence / absence of the printing paper stored in the paper storage unit; and feeding of the printing paper from the paper storage unit to the registration roller pair. Save time on the paper Storage means for storing each of the storage sections; and detecting the paper size that the print paper of the same size as the print paper stored in the paper storage section selected by the selection means is stored in another paper storage section. Means and the paper presence / absence detection means detect the paper storage part when the paper presence / absence detection means detects that there is no print paper in the paper storage part selected by the selection means during the printing operation. The plate cylinder, the pressing member, and the resist are automatically switched to another sheet storage unit based on the feeding time of the printing sheet from the sheet storage unit to the pair of registration rollers stored in the storage unit. A stencil printing apparatus comprising: control means for controlling the operation of each pair of rollers. 2. A porous cylindrical plate cylinder, a main paper feed tray for storing printing paper, and a printing paper of the same size as the main paper feeding tray, which is provided on substantially the same plane as the main paper feeding tray. A paper feeder having an auxiliary paper tray for storing, and a transfer unit for collectively transferring the print paper stored in the auxiliary paper tray to the main paper tray; and an outer periphery of the plate cylinder for transferring the print paper. A stencil printing apparatus comprising: a pressing member that presses against the surface; and a registration roller pair that sends the printing paper fed from the paper feeding device toward between the plate cylinder and the pressing member. Paper presence / absence detection means provided in each of the main paper supply tray and the auxiliary paper supply tray for detecting the presence / absence of the printing paper stored in the tray and the auxiliary paper supply tray; and Roller pair A storage unit that stores the feed time of the printing paper, and the paper presence / absence detection unit detects that the printing paper is stored in the auxiliary paper feeding tray, and stores the printing paper in the main paper feeding tray during a printing operation. When the absence of print paper is detected by the paper presence / absence detection means, the print paper stored in the auxiliary paper feed tray is fed after being transferred to the main paper feed tray by the transfer means, Control means for controlling the operation of the plate cylinder, the pressing member, and the registration roller pair based on the feeding time of the printing paper from the auxiliary paper tray to the registration roller pair stored in the storage means, and A stencil printing apparatus comprising: 3. A multi-stage paper feeding device having a porous cylindrical plate cylinder, a plurality of paper storage units, and capable of feeding a plurality of types of printing paper, and pressing the printing paper against the outer peripheral surface of the plate cylinder. Pressing member, selecting means for selecting one of the respective paper storage sections at the time of printing, and pressing the printing paper fed from the paper storage section selected by the selecting means with the plate cylinder. A stencil printing apparatus having a pair of registration rollers for sending the sheet to a member, a sheet size detecting unit provided for each of the sheet storage units, for detecting a size of the printing paper stored in the sheet storage unit, A paper presence / absence detection means provided for each paper storage unit for detecting the presence / absence of the printing paper stored in the paper storage unit; and feeding of the printing paper from the paper storage unit to the registration roller pair. Save time on the paper Storage means for storing each of the paper storage units, wherein at least one of the paper storage units is provided on a substantially same plane as the main paper supply tray and a main paper supply tray for storing the printing paper. An auxiliary paper tray for storing printing paper of the same size as the printing paper stored in the main paper tray, and a transfer means for collectively transferring the printing paper in the auxiliary paper tray to the main paper tray. The paper size detection unit and the presence or absence of the sheet indicate that print paper of the same size as the print paper stored in the paper storage unit selected by the selection unit is also stored in another paper storage unit. When the detection unit detects, the paper storage unit having the main paper tray is selected by the selection unit, and it is detected that there is no printing paper in the main paper tray during the printing operation,
The sheet storage unit is automatically switched to another sheet storage unit, and the plate cylinder and the pressing unit are pressed based on the feeding time of the printing sheet from the sheet storage unit to the pair of registration rollers stored in the storage unit. A stencil printing apparatus comprising: a control unit that controls the operation of a member and the pair of registration rollers, and then controls the transfer unit to transfer the printing paper in the auxiliary paper tray to the main paper tray. 4. The rotating peripheral speed of the pair of registration rollers is:
4. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus differs depending on the type of the printing paper.