JP2000108480A - Stencil printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printing apparatus having a multistage paper feeding device, which can eliminate a poor paper feeding and delivery without lowering a printing efficiency. SOLUTION: In a stencil printing apparatus 1 having a plurality of paper storage parts 25, 28, 29 and 30 for storing printing papers and a paper feeding device 3, which can feed a plurality of kinds of printing paper P1, P2, P3 and P4, a paper kind setting means for selecting and setting the kinds of paper for each one of the paper storage parts 25, 28, 29 and 30 and a controlling means for selecting and setting conveying conditions in response to the kind of paper selected and set with the paper kind setting means are provided.

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 for performing printing by winding a master on the outer peripheral surface of a plate cylinder, and more particularly, to a stencil printing machine having a paper feeding device capable of feeding a plurality of types of printing paper. Related to a printing device.

[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.

A wide variety of printing papers are used in the above-described stencil printing apparatus. Examples of the printing papers used include thin paper (removed paper, high-quality 45 kg paper, etc.) and standard paper (copy paper, medium paper). , High-quality 55kg paper, recycled paper, stencil high-quality paper, etc.), cardboard (drawing paper, postcards, envelopes, high-quality 135kg paper,
High-quality 180 kg paper).

In order to perform good paper feeding and discharging in a stencil printing machine, it is essential to eliminate conveyance failures such as double feeding, non-feeding and paper feeding / discharging jams. It is necessary to change various conditions (conveyance conditions) for sheet conveyance in the sheet supply / discharge unit to optimal values according to types such as thickness and size. This is because the optimum transport condition differs for each type of printing paper.

The variable transport conditions include, for example, setting of a paper feeding pressure, setting of a separating pressure, setting of an angle of a paper ejection jump plate, timing of a registration roller, and the like. Conventionally, an operator visually checks the thickness and size of a printing paper. Then, the type of paper is determined, and the paper feed pressure setting, the separation pressure setting, the paper ejection jump plate angle, and the like are set by manual operation so that the optimum transport conditions are obtained according to the paper type.

[0006]

However, it is difficult for a general operator to determine the optimum transport conditions, and it is very troublesome to manually set each part, and in practice, manual operations are required. Almost no setting work has been performed, and problems such as double feeding and non-feeding have not been solved.

[0007] Recently, there are provided a plurality of paper feed trays (paper feed cassettes) as paper storage units for storing print papers.
Multi-stage paper feeders capable of feeding a plurality of types of printing paper are being used. In a stencil printing apparatus having such a multi-stage paper feeder, the transport conditions must be reset for each selected paper feed tray, and the printing efficiency is extremely reduced.

The present invention solves the above problems and provides a stencil printing apparatus having a multi-stage paper feeder, which can eliminate defective sheet feeding and discharging without lowering printing efficiency. Aim.

[0009]

According to the first aspect of the present invention,
In a stencil printing apparatus having a plurality of paper storage units for storing printing paper and having a paper feeding device capable of feeding a plurality of types of printing paper, the type of the printing paper is selected and set for each paper storage unit. It is characterized by comprising a paper type setting means, and a control means for selecting and setting a transport condition corresponding to the paper type selected and set by the paper type setting means.

According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the control means further comprises: a type of the printing paper selected and set by the paper type setting means; It is characterized by having storage means for storing for each sheet storage unit.

According to a third aspect of the present invention, there is provided the stencil printing apparatus according to the second aspect, further comprising a sheet storage section selecting means for selecting which of the plurality of sheet storage sections to use for printing. When a paper storage unit used by the paper storage unit selection unit is selected, the control unit calls the type of the printing paper and the transport condition of the paper storage unit stored in the storage unit. It is characterized by the following.

According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first, second or third aspect, the paper feeding device further comprises a conveying path for the printing paper from a plurality of the paper storage units. At least one of which is linearly formed, wherein the paper type setting means is capable of setting at least standard paper and thick paper, and wherein the paper storage section other than the paper storage section having the transport path formed linearly. Wherein when a thick paper is set by the paper type setting means, a warning is issued or the setting of the thick paper is prohibited.

According to a fifth aspect of the present invention, in the stencil printing apparatus according to the first, second or third aspect, the paper feeding device further comprises a conveying path for the printing paper from a plurality of the paper storage units. At least one of which is linearly formed, wherein the paper type setting means is capable of setting at least standard paper and thick paper, and wherein the paper storage section other than the paper storage section having the transport path formed linearly. Wherein thick paper is set by the paper type setting means, the paper storage section is forcibly shifted to the paper storage section in which the transport path is formed linearly.

According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fifth aspects, the control means may further include at least a sheet feeding pressure and a feeding condition as the transport conditions. It is characterized in that the separation pressure is controlled.

[0015]

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 paper feeding unit 3 as a paper feeding device, a plate making unit 4, a printing unit 5, a paper 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 are provided on a pressure plate (not shown). 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 and a second paper supply tray 29, which are paper storage units that can store print papers P1 and P2 of the same size, and a paper storage unit that can store large-size print paper P3. And a fourth paper feed tray 25, which is a paper storage section provided with a substantially straight paper transport path so that special printing paper P4 such as thick paper and envelopes can be fed. have.

A paper feed roller 32 is provided above the first paper supply tray 28, a paper supply roller 33 is provided above the third paper supply tray 30, and a paper supply roller 2 is provided above the fourth paper supply tray 25.
6 are rotatably arranged, and below the first paper feed tray 28, the printing paper P1 on the first paper feed tray 28 is swung by driving means (not shown) to feed the paper P3.
The push-up member 34 that presses the third paper feed tray 3
0, the driving means (not shown) swings the third
A push-up member 35 for pressing the printing paper P3 on the paper feeding tray 30 against the paper feeding roller 33 is provided below the fourth paper feeding tray 25 by the rotational driving force of the motor 55. Push-up means 27 each composed of a rack and pinion mechanism for pressing P4 against the paper feed roller 26 are provided.

The paper feed roller 26 is, as shown in FIG.
It is rotatably supported by a bracket 58 together with the separation roller 57. The bracket 58 is swingably supported on a side plate (not shown) of the housing 9 around a support shaft (not shown) of the separation roller 57, and has an end on the side opposite to the side supporting the paper feed roller 26. One end of a tension coil spring 59 is attached. Pulley 2 is attached to paper feed roller 26
6a, two pulleys 57a are attached to the separation roller 57, and an endless belt 69 that transmits a driving force from a motor 68 provided on the housing 9 is stretched over the pulley 57a. Pulley 26a, 57
An endless belt 70 for transmitting the driving force from the motor 68 is also stretched between a.

The other end of the tension coil spring 59 having one end attached to the bracket 58 is attached to a rack 84 supported on a side plate of the casing 9 (not shown) so as to be vertically movable. In the vicinity of the rack 84, a stepping motor 85 having a pinion that meshes with the rack 84 is provided on the output shaft. With this configuration, when the stepping motor 85 rotates and the rack 84 moves upward, the bracket 58 swings clockwise about the support shaft (not shown) of the separation roller 57, and the paper feed roller 26 with respect to the printing paper P4 is rotated. Feed pressure increases. Above the bracket 58, the printing paper P4 stacked on the fourth paper feed tray 25 is placed.
Upper surface detection sensor 87 for detecting the uppermost upper surface position of
However, a lower limit detection sensor 99 for detecting the lower limit position of the fourth paper feed tray 25 is provided near the push-up means 27.

The separation pad 1 is provided below the separation roller 57.
00 is provided. Separation pad 1 that presses against the peripheral surface of separation roller 57 to separate print paper P4 one by one
Reference numeral 00 denotes a vertically movable member supported by a guide member (not shown) provided on the housing 9, and one end of a compression coil spring 101 is attached to the lower surface thereof. The other end of the compression coil spring 101 is attached to a rack 102 which is supported on a side plate of a housing 9 (not shown) so as to be movable up and down.
Stepping motor 1 having a pinion meshing with 2
03 is provided. With this configuration, when the stepping motor 103 rotates and the rack 102 moves upward, the compression coil spring 101 is compressed, and the separation pressure of the separation pad 100 with respect to the separation roller 57 increases.

The fourth paper feed tray 25 has a pair of side fences 145 having a left-right interlocking structure, and a fourth paper size detection sensor 146 for detecting the size of the printing paper P4.
And a fourth paper presence / absence detection sensor 147 for detecting the presence / absence of print paper P4 on the fourth paper feed tray 25.

In the vicinity of the paper feed roller 32, a separation roller pair 37 including a drive roller 37a and a driven roller 37b is provided. As shown in FIG. 2, the paper feed roller 32 and the drive roller 37a are connected to a bracket 148.
It is supported rotatably. The bracket 148 is swingably supported on a side plate (not shown) of the housing 9 around the support shaft 37c of the drive roller 37a, and a tension is applied to an end on the side opposite to the side supporting the paper feed roller 32. One end of the coil spring 149 is attached. Paper feed roller 3
2, a pulley 32a is attached to the drive roller 37a, and two pulleys 37d are attached to the drive roller 37a. An endless belt 151 that transmits a driving force from a motor 150 provided on the housing 9 is mounted on the pulley 37d. Passed,
An endless belt 152 is stretched between the pulleys 32a and 37d.

The other end of the extension coil spring 149 is provided with a rack 15 supported on a side plate of the casing 9 (not shown) so as to be vertically movable.
In the vicinity of the rack 153, a stepping motor 154 having a pinion that meshes with the rack 153 is provided on the output shaft. With this configuration, when the stepping motor 154 rotates and the rack 153 moves upward, the bracket 148 moves
The paper feed roller 32 swings counterclockwise around the center 7c, and the paper feed pressure of the paper feed roller 32 on the print paper P1 increases. In the vicinity of the bracket 148, a first paper presence / absence detection sensor 3 for detecting the presence / absence of the print paper P1 on the first paper feed tray 28 by contacting the print paper P1 pushed up by the push-up member 34.
6 (see FIG. 1).

The driven roller 37b is supported by a guide member (not shown) provided on the housing 9 so as to be vertically movable and rotatable, and one end of a compression coil spring 155 is attached to its support shaft 37e. Compression coil spring 1
The other end of the motor 55 is attached to a rack 156 supported on a side plate of the casing 9 (not shown) so as to be vertically movable. A stepping motor near the rack 156 has a pinion on its output shaft meshing with the rack 156. 157 are provided. With this configuration, the stepping motor 1
When the rack 57 moves upward due to the rotation of 57, the compression coil spring 155 is compressed, and the separation pressure of the driven roller 37b with respect to the driving roller 37a increases.

The first paper feed tray 28 is provided with a side fence (not shown) for guiding the print paper P1 in the width direction, and a first paper size detection sensor 45 for detecting the size of the print paper P1. .

In the vicinity of the paper feed roller 33, similarly to the separation roller pair 37, the driving roller 38 a and the driven roller 3
8b is provided.
The paper feed roller 33 and the drive roller 38a are rotatably supported by a bracket (not shown) that is swingably supported by the housing 9 about a support shaft (not shown) of the drive roller 38a. The paper feed roller 33 and the drive roller 38 a are driven to rotate by receiving a driving force from a motor 158 provided on the housing 9, and a bracket (not shown) includes a stepping mechanism provided on the housing 9 similarly to the bracket 148. The print paper P is swung by the motor 159.
3, the paper feed pressure of the paper feed roller 33 is varied. A push-up member 35 is provided near the bracket (not shown).
A third paper presence / absence detection sensor 44 for detecting the presence / absence of the print paper P3 on the third paper feed tray 30 by contacting the print paper P3 pushed up by the third paper feed tray 30 is provided.

The driven roller 38b includes the driven roller 37
Similarly to b, it is vertically and rotatably supported by a guide member (not shown) provided on the housing 9, and is moved up and down by a stepping motor 160 provided on the housing 9, whereby the drive roller 38a Of the driven roller 38b is varied.

The third paper feed tray 30 is provided with a side fence (not shown) for guiding the width of the print paper P3 and a third paper size detection sensor 47 for detecting the size of the print paper P3. .

When the printing paper P1 on the first paper feeding tray 28 is used up, the printing paper P2 on the second paper feeding tray 29 is loaded onto the first paper feeding tray 28 in the second paper feeding tray 29. A sheet moving member 31 to move the sheet P, a side fence (not shown) for guiding the width direction of the printing sheet P2, a second sheet presence sensor 43 for detecting the presence or absence of the printing sheet P2 on the second sheet tray 29, A second paper size detection sensor 46 for detecting the size of the printing paper P2 is provided. 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. 5-124737.

A transport roller pair 39 for transporting the print paper P3 upward is disposed above the separation roller pair 38, and the print paper P1, P2, P3, and P3 are disposed above the transport roller pair 39.
A transport roller group 41 that transports P4 to the left in FIG.
But further to the left, the printing papers P1, P2, P3, P
A transport roller pair 40 for transporting the sheet 4 toward the registration roller pair 42 is provided.

As shown in FIG. 3, the registration roller pair 42 includes a driving roller 42a and a driven roller 42b pressed against the driving roller 42a, and is provided on the housing 9 via an endless belt 162. The driven roller 42a is driven to rotate by receiving the rotation driving force of the gear motor 161 and the driven roller 42b is driven to rotate.

The driven roller 42b is vertically and rotatably supported by a guide member (not shown) provided on the housing 9, and one end of a compression coil spring 163 is attached to its support shaft 42c. Compression coil spring 1
The other end of the frame 63 is attached to a rack 164 supported on a side plate of the casing 9 (not shown) so as to be vertically movable, and a stepping motor having a pinion meshed with the rack 164 on an output shaft near the rack 164. 165 are provided. With this configuration, the stepping motor 1
When the rack 65 moves upward due to the rotation of the 65, the compression coil spring 163 is compressed, and the pressing force of the driven roller 42b against the driving roller 42a increases.

Below the pair of registration rollers 42, a jam is detected when the printing papers P1, P2, P3, and P4 are not sent to the pair of registration rollers 42 within a predetermined time.
A paper jam detection sensor 86 is provided.

A plate making section 4 is provided above the sheet feeding section 3. 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, a thermal head 50 that heats and perforates the master 48, and a master 4
It mainly comprises a platen roller 51 for transporting the master 8 while pressing it to 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. The leading end of the master 48 is connected to the cutting
A master leading end detection sensor 56 for detecting that the master tip detection sensor is placed at the initial position where the cutting is performed is provided.

On the left side of the plate making section 4, a printing section 5 is provided. 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
A driving force from a plate cylinder driving unit (not shown) is transmitted to rotate the plate cylinder. 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. Clamper 64
Is opened and closed by a clamper opening / closing means (not shown) when the plate cylinder 60 reaches a predetermined position.

An ink supply means 61 is provided inside the plate cylinder 60. 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.

A paper discharge unit 6 is provided on the left side of the print 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.

A paper discharging and conveying member 74 composed of a driving roller 76, a driven roller 77, an endless belt 78, a suction fan 79, and a jump plate 166 holds the printing paper P on the endless belt 78 by the suction force of the suction fan 79. Then, the printing paper P is transported in the direction of the arrow in the figure by the rotation of the driving roller 76. A pair of jump plates 166 are provided on both sides of the downstream end of the paper discharge transport member 74 in the paper transport direction. As shown in FIG. 4, a jump plate 166 for stiffening the printing paper P conveyed on the endless belt 78 is pivotally movable at one end by a support shaft 166a on a main body side plate (not shown) of the paper discharge conveyance member 74. One end of a rack 167 is rotatably attached to the other end.
A stepping motor 168 having a pinion that meshes with the rack 167 is provided on the output shaft near the rack 167 that is supported on the main body side plate (not shown) of the sheet discharge conveyance member 74 so as to be vertically movable. Stepping motor 1
As the rack 68 moves as the 68 rotates, the angle of the jump plate 166 is changed.

The 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 side fences 81 and 82, and an end fence 83.

A plate discharging section 7 is arranged 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 the figure, whereby the endless belt 94 moves in the direction of the arrow in the figure. Lower plate discharging member 89
Similarly to the upper plate discharging member 88, the upper plate discharging member 88 includes a driving roller 95, a driven roller 96, and an endless belt 97. When the driving roller 95 rotates counterclockwise in the drawing, the endless belt 97 moves in the direction of the arrow in the drawing. I do. 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. 5 shows an operation panel of the stencil printing machine 1. Operation panel 1 provided on the upper front surface of housing 9
Reference numeral 04 denotes a plate making start key 105, a printing start key 106, a trial printing key 107, a stop key 1
08, numeric keypad 109, enter key 110, clear key 111, program key 112, mode setting key 11
3. Display device 1 comprising mode clear key 114, enlargement / reduction key 115, printing speed setting key 116, tray selection key 117 as paper storage section selection means, paper selection key 118 as paper type setting means, and 7-segment LED
19, a jam display device 120 composed of LEDs, a display device 121 composed of an LCD, a tray display means 122 composed of LEDs for displaying the tray selected by the tray selection key 117, and a paper type selected by the paper selection key 118 are displayed. The paper type display unit 123 is provided. The operation command from the operation panel 104 is output to the control unit 8.

A control unit 8 is provided below the inside of the housing 9. The control unit 8 includes a CPU 12 as shown in FIG.
5, a control means 124, which is a well-known microcomputer having a RAM 126, a ROM 127, an I / O expander 128, etc., and controls the operation of the stencil printing apparatus 1.

An output signal from each sensor and the operation panel 104 is input to the CPU 125. Each input signal is arithmetically processed based on the operation program stored in the ROM 127, and controls each of the image reading unit 2, the paper feeding unit 3, the plate making unit 4, the printing unit 5, the paper discharging unit 6, and the plate discharging unit 7. The signal is output to the drive circuit as an operation signal, and is output to the operation panel 104 as a display signal.

An operation program called from the ROM 127 by the CPU 125 is temporarily written into the RAM 126.
Is rewritten by the input from.

The ROM 127 stores a plurality of operation programs for operating the respective actuators of the stencil printing apparatus 1 and also stores optimum transport conditions obtained in advance through experiments and the like. In this embodiment, the transport conditions are such that the printing papers P1, P3,
Pressure contact force (feeding pressure) against P4, pressure contact force (separation pressure) between separation pad 100 and separation roller 57 of each driven roller 37b, 38b and each drive roller 37a, 38a, peripheral speed (registration speed) of drive roller 42a,
The pressing force (registration pressure) of the driven roller 42b against the driving roller 42a and the angle of the jump plate 166.

The feature of the present invention is that the transfer condition setting of the stencil printing apparatus 1 that differs depending on the type of the printing paper P used is
By simply selecting and setting the type of printing paper P for each paper storage unit, the control means 124 automatically switches to the optimum transport conditions, thereby preventing transport problems. Hereinafter, operations of the tray selection key 117 and the paper selection key 118 will be described.

The tray selection key 117 is depressed when selecting a tray to be used for printing. Each time the tray selection key 117 is depressed, the tray for feeding the printing paper P is set to the first sheet feeding tray 28, the third sheet feeding tray 30, Switching to the fourth paper feed tray 25 is performed. 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 121 on the basis of the signals from 7, 146. The tray display unit 122 displays the tray selected when the tray selection key 117 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 118 is depressed when setting the type of the printing paper P used for printing, and each time it is pressed, the transport condition of the printing paper P stored in the control means described later is changed. The paper type display unit 123 displays the paper type selected when the paper selection key 118 is pressed. In this embodiment, “standard” (for example, paper of 90 kg paper or less), “thick paper 1” (for example, paper of about 110 to 135 kg paper), “thick paper 2” (for example, 180 kg paper), “thin paper” (for example, One of "envelopes", "envelopes" (regular envelopes such as rectangles and squares), and "users" (arbitrarily settable) is displayed.

In this embodiment, since the optimum transport conditions are finely set in accordance with the type of the printing paper P, "standard", "thick paper 1", "thick paper 2", "thin paper",
Although the transfer conditions are set corresponding to the six types of "envelope" and "user", at least "standard", "cardboard", and "envelope" if detailed setting of the transfer conditions is not desired.
It is only necessary to support the three types, and this is supported by trial production and experiments.

Based on the above configuration, the stencil printing apparatus 1 will be described below.
Will be described. Prior to the plate making operation, the operator presses the tray selection key 117 to select a tray to be used, and when the paper selection key 118 is pressed according to the type of printing paper P loaded on this tray, the control unit 124. , And a transfer condition setting corresponding to the type of the printing paper P is performed based on Table 1.

[0056]

[Table 1]

Hereinafter, the contents of Table 1 will be supplementarily described. If the sheet feeding pressure is too small, non-feeding occurs, and if it is too large, double feeding occurs. Therefore, in the case of "thin paper" or "standard", the value is set as small as possible (the smaller the numerical value, the smaller the pressure).
In the case of "envelope", an intermediate value between "standard" and "cardboard" is optimal from the result of the experiment.

The separation pressure is set large in the "standard" to prevent double feeding, but in the case of "thin paper", it is set small because the pressure is large and wrinkles and tears occur. In the case of "thick paper", if the separation pressure is too high, so-called paper peeling occurs. In the case of "envelope", it is desirable to set as small as possible based on the result of the experiment.

In the "standard", the angle of the jump plate needs to be increased and the printing paper P needs to be corrugated to some extent before being discharged. In the case of "thin paper", the angle must be increased to further secure the waist, and in the case of "thick paper" or "envelope", the waist is not necessary because the paper itself has a waist, In addition, the angle is made as small as possible because it cannot be fitted.

If the registration pressure, which is the pressing force of the registration roller pair 42, is too small, non-feeding or displacement occurs, and if it is too large, slippage occurs. Similarly to the sheet feeding pressure, the resist pressure is set as small as possible for “thin paper” and “standard”, and is set large for “thick paper”. In the case of "envelope", the value is an intermediate value between "standard" and "cardboard".

The registration roller pair 42 (drive roller 4
The registration speed, which is the peripheral speed of 2a), is set to "standard" at a high speed, "thin paper" is set at a slightly lower speed, and "thick paper" is set at a lower speed.
In the case of "thin paper", the occurrence of tear is prevented, and in the case of "thick paper", occurrence of slip is prevented. "Envelope" is set at a later time similarly to "cardboard". The transfer conditions shown in Table 1 are set in advance based on experimental data and the like.
It is stored in the OM 127.

When “tray 3” (fourth paper feed tray 25) is selected as the tray to be used, and “thick paper 2” is selected as the type of the printing paper P4, the control means 124 returns to Table 1.
Among the transfer conditions shown in the above, the optimum transfer conditions, namely, the feed pressure value “3”, the separation pressure value “2”, the jump plate angle value “small”, the resist pressure value “3”, and the resist speed value “1” Is automatically selected, the stepping motor 85 is set so that the sheet feeding pressure value is “3”, the stepping motor 103 is set so that the separating pressure value is “2”, and the jump plate angle value is “small”. The stepping motor 168 and the stepping motor 165 such that the resist pressure value becomes "3", and based on the step value of each stepping motor, the sheet feeding roller 26, the separation pad 100, the jump plate 166, the driven The roller 42b is positioned. At this time, the gear of the gear motor 161 is switched to the gear corresponding to the registration speed value “1”.

After the tray selection operation and the paper type selection operation, one or a plurality of originals are set on the original placing table 11, and after the operator sets the plate making conditions by various keys on the operation panel 104, the plate making start key is pressed. When the button 105 is pressed, a document image is read by the image reading unit 2 and the read image is sent to the control unit 124 as an image data signal.

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 starts rotating in a counterclockwise direction in the figure by a plate cylinder driving unit (not shown). When the control unit 124 determines that the rear end of the used master 98 wound around 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 124 is issued. As a result, the moving means and the driving means (not shown) operate, and the driving rollers 92 and 95
Rotates, and moves the lower plate discharging member 89 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. Master 98 is the lower plate discharging member 8
9 and the upper plate discharging member 88, and is peeled off 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
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 124 to the opening / closing means (not shown), the clamper 64 is opened, the plate cylinder 60 enters a plate feeding standby state, and the plate discharging operation is completed.

After the completion of the plate discharging operation, a plate making operation is performed. When the plate cylinder 60 enters the plate feeding standby state, a stepping motor (not shown) is operated by an operation signal from the control means 124, and the platen roller 51 and each pair of master transport rollers 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
If the determination is made at 24, 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 the transport speed of the master 48, and
8 is carried out on the plate cylinder 60. When the control means 124 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.

Following the winding operation, a plate attaching operation is performed. Prior to the end of the winding operation, a command is sent from the control means 124, the motor 55 is operated, and the fourth paper feed tray 25 is raised. Then, when the uppermost surface of the printing paper P4 comes into contact with the peripheral surface of the paper feed roller 26 and pushes it up,
The bracket 58 rises and comes into contact with the upper surface detection sensor 87, and the operation of the motor 55 is stopped based on a signal from the upper surface detection sensor 87. Thereby, the fourth paper feed tray 25 is positioned at a predetermined paper feed position.

When the plate cylinder 60 stops at the home position, an operation signal is sent from the control means 124 to rotate the plate cylinder 60 at a low speed, and at the same time, the sheet feed roller 26, the separation roller 57, the respective sheet transport rollers 40, 41 are respectively driven to rotate. Due to the rotation of the paper feed roller 26 and the separation roller 57, the uppermost one of the print papers P4 stacked on the fourth paper feed tray 25 is pulled out, and the leading end thereof is held in the registration roller pair 42. At this time,
Since the optimal transport condition settings have already been made, the printing paper P4 can be transported without any transport failure such as non-feeding or double feeding.
Sheets are fed one by one.

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 124 to rotate the registration roller pair 42, and the printing paper P is fed between the plate cylinder 60 and the press roller 62. Also at this time, the printing paper P4 is reliably fed without occurrence of conveyance failure such as non-feeding, displacement, and slippage. Control means 1
24 sends an operation signal to a not-shown locking means for holding the press roller 62 following the operation signal to the registration roller pair 42 to swing the press roller 62.

The printing paper P fed by the registration roller pair 42 is pressed by the press roller 62 against the master 48 wound around the plate cylinder 60. By this pressing operation, the press roller 62, the printing paper P, the master 48, and the outer peripheral surface of the plate cylinder 60 are pressed against each other, and the ink supplied to the inner peripheral surface of the plate cylinder 60 by the ink roller 65 is applied to the outer periphery of the plate cylinder 60. After exuding from the opening of the surface and the mesh screen, the gap between the outer peripheral surface of the plate cylinder 60 and the master 48 is filled and transferred to the printing paper P through the perforated portion of the master 48.

The printing paper P to which the ink has been transferred is peeled off from the outer peripheral surface of the plate cylinder 60 at the tip of the peeling claw 71 and is guided between the guide plates 72 and 73. The sheet is conveyed to the left while being attracted to the upper surface of the sheet ejection tray 80 via the jump plate 166.
Is discharged on top. At this time, the printing paper P4 is satisfactorily conveyed without being disturbed by the jump plate 166.

The printing operation is completed by the above-described series of steps, and the stencil printing machine 1 enters a printing standby state. At the time of this printing operation, if the operator recognizes that the "thick paper 2" is correct, the printing paper P4 is discharged onto the discharge tray 80 without causing a conveyance failure.

When the operator presses the trial printing key 107 in the stencil printing apparatus 1 in which the above-described original reading, plate discharging, plate making, and plate making operations are completed and the printing is in a standby state, the same operation as in the plate making operation is performed. The printing paper P4 is fed from the fourth paper feed tray 25, is held by the pair of registration rollers 42, and the plate cylinder 60 is rotated 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 by the press roller 62 against the master 48 wound around the plate cylinder 60 to transfer the ink,
After the print image is formed on the upper surface, the print image is peeled from the outer peripheral surface of the plate cylinder 60 by the peeling claws 71, conveyed to the left by the discharge conveyance member 74, and discharged onto the discharge tray 80. The plate cylinder 60 returns to the home position again, and the test printing operation is completed. Even during the trial printing operation, the optimum transport condition is set, so that the print paper P4 is discharged onto the discharge tray 80 without causing a transport failure.

After confirming the printing speed and the position of the printed image by trial printing, adjusting these with various keys on the operation panel and performing trial printing again, the number of prints was set on the display device 119 with the ten keys 109. After print start key 10
By pressing 6, the printing paper P4 is continuously fed from the fourth paper feed tray 25, and the printing operation is performed. Even during this printing operation, since the optimal transport conditions are set, the print paper P4 is discharged onto the discharge tray 80 without causing a transport failure.

By the way, even when the printing operation, the trial printing operation, and the printing operation are performed by selecting and setting the paper type considered to be optimal as described above, the brand and type of the printing paper P, the printing paper P (Delivery failure) may occur depending on the state (absorption of moisture, degree of curl, etc.) or environmental conditions at that time. In this case, the program key 112 on the operation panel 104, the mode setting key 1
Using 13 or the like, it is possible to input an arbitrary value in the column of the paper type “user”. Note that this arbitrary value is
This is an arbitrary value within a set range of each actuator for changing the sheet feeding pressure, the separation pressure, the jump plate angle, the resist pressure, and the resist speed.

In another embodiment of the present invention, the tray selection key 117 is pressed to select a tray to be used, and the paper selection key 118 is pressed according to the type of printing paper P loaded on this tray. After that, the selected tray and the corresponding paper type may be stored in the RAM 126 for each selected tray by pressing the enter key 110, for example. With this configuration, every time the tray selection key 117 is pressed and the LED of the tray display unit 122 is moved,
Paper type display means 12 without pressing paper selection key 118
The third LED is automatically moved to the stored type, and the operability is improved. In this case, the RAM 126 functions as a storage unit. By providing a backup battery in the RAM 126, the set contents can be retained even when the main power of the stencil printing apparatus 1 is turned off.

Further, as another embodiment of the above embodiment,
After “tray 1” (first paper tray 28) or “tray 2” (third paper tray 30) is selected with the tray selection key 117, “thick paper 1” or “thick paper 2” is selected with the paper selection key 118. Alternatively, when "envelope" is selected, a warning such as "the paper type setting is incorrect" is displayed on the display device 121 or a buzzer sounds to alert the operator, or "tray 1", When “tray 2” is selected, “thick paper 1”, “thick paper 2”, and “envelope” cannot be set (the LED of the paper type display means 123 does not move and each actuator does not operate). Is also good. With such a configuration, the sheet transport path is not formed linearly (the first sheet feed tray 28 and the third
The printing papers P1 and P3 fed from the paper feeding tray 30 are bent at substantially right angles by the paper transport roller group 41. The use of thick paper or a printing paper equivalent thereto in the paper feeding tray can be prohibited, and the paper feeding jam can be prevented. Can be prevented beforehand. As a modified example of this embodiment, after “tray 1” or “tray 2” is selected by the tray selection key 117, “thick paper 1”, “thick paper 2”, or “envelope” is selected by the paper selection key 118. In this case, the same effect can be obtained even if the LED of the tray display means 122 is forcibly moved to the tray 3 (the fourth paper feed tray 25) and only the actuator corresponding to the tray 3 can be operated. it can.

In each of the above embodiments, the tray selection key 117
Is pressed, the size of the selected printing paper P is displayed on the display device 121. However, when the paper selection key 118 is pressed, the size of the selected printing paper P corresponds to the type of the selected printing paper P. (For example, when "standard" is selected, "copy paper, medium-quality paper, high-quality paper") may be displayed on the display device 121.

In each of the above embodiments and modified examples, the press roller 62 is used as the pressing member. However, the press roller 62 is replaced with the same diameter as the plate cylinder 60 and is rotated and driven in synchronization with the plate cylinder 60. Alternatively, an impression cylinder having printing paper holding claws may be used. In this case, the printing paper holding claw is configured not to hold the leading edge of the printing paper P when “thick paper 1”, “thick paper 2”, or “envelope” is selected by the paper selection key 118. As a result, it is possible to prevent the occurrence of sheet folding at the leading end of the sheet.

Further, in each of the above-described embodiments, the fourth paper storage section in which the paper transport path for the printing paper P is formed linearly is the fourth paper storage section.
Although the paper feed tray 25 is shown, a manual feed tray or an LCT (Large Capacity Tray; large capacity paper feeder) may be used instead of the fourth paper feed tray 25.

[0083]

According to the present invention, the paper type setting means selects and sets the type of printing paper for each of the plurality of paper storage units, and the control means controls the transport conditions according to the selected and set paper type. Since selection and setting are performed, optimal conveyance can be performed according to the type of paper, and even in a stencil printing apparatus having a multi-stage paper feeding device, occurrence of paper conveyance failure during a printing operation can be reliably prevented. .

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram of a sheet feeding roller and a separation roller used in one embodiment of the present invention.

FIG. 3 is a schematic view of a registration roller pair used in one embodiment of the present invention.

FIG. 4 is a schematic view of a sheet discharge conveying member used in one embodiment of the present invention.

FIG. 5 is a schematic diagram of an operation panel used in one embodiment of the present invention.

FIG. 6 is a block diagram of control means used in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 3 Paper feeder (paper feeder) 25 Paper storage part (fourth paper supply tray) 28 Paper storage part (first paper supply tray) 29 Paper storage part (second paper supply tray) 30 Paper storage part (Third paper feed tray) 117 Paper storage section selection means (tray selection key) 118 Paper type setting means (paper selection key) 124 Control means 126 Storage means (RAM) P, P1, P2, P3, P4 Printing paper

Claims (6)

[Claims] 1. A stencil printing machine having a plurality of paper storage units for storing printing paper and having a paper feeding device capable of feeding a plurality of types of printing paper, wherein the type of the printing paper is determined for each of the paper storage units. A stencil printing apparatus comprising: a paper type setting means for selecting and setting; and a control means for selecting and setting a transport condition according to a paper type selected and set by the paper type setting means. 2. The printing apparatus according to claim 1, wherein the control unit includes a storage unit configured to store the type of the printing paper and the transport condition selected and set by the paper type setting unit for each of the paper storage units. Item 8. A stencil printing apparatus according to Item 1. 3. A printing apparatus according to claim 1, further comprising a paper storage section selecting means for selecting which one of the plurality of paper storage sections to use for printing, wherein the paper storage section used by the paper storage section selection means is selected. 3. The stencil printing apparatus according to claim 2, wherein the control unit retrieves the type of the printing paper and the transport condition of the paper storage unit stored in the storage unit. 4. The paper feeder according to claim 1, wherein at least one of the printing paper transport paths from the plurality of paper storage units is formed linearly, and the paper type setting means sets at least standard paper and thick paper. When a thick paper is set by the paper type setting means in the paper storage unit other than the paper storage unit in which the transport path is formed linearly, a warning is issued or the setting of the thick paper is prohibited. 4. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus is characterized in that: 5. The paper feeding device according to claim 1, wherein at least one of the printing paper transport paths from the plurality of paper storage units is formed linearly, and the paper type setting means sets at least standard paper and thick paper. When thick paper is set by the paper type setting means in the paper storage unit other than the paper storage unit in which the transport path is formed linearly, the transport path is linear. 4. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus is forcibly shifted to the paper storage unit formed in the stencil printing apparatus. 6. The stencil printing apparatus according to claim 1, wherein the control unit controls at least a sheet feeding pressure and a separation pressure as the transport condition. .