JPH1158912A - Screen printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing machine capable of preventing the noise or image irregularity caused by the contact of a press roller with a plate cylinder. SOLUTION: A screen printing machine has plate cylinders 1a, 1b around which a master after plate making is wound, the ink supply means 3a, 3b, 4a, 4b arranged within the plate cylinders 1a, 1b and supplying ink to the master wound around the plate cylinders 1a, 1b and press rollers 9a, 9b capable of being brought into contact with and separated from the plate cylinders 1a, 1b at the positions opposed to the ink supply means 3a, 3b, 4a, 4b and printing is applied to paper 22 by printing parts 61a, 61b where the plate cylinders 1a, 1b are opposed to the press rollers 9a, 9b. In this case, the printing parts 61a, 61b are positioned beside the centers of rotation of the plate cylinders 1a, 1b.

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 pressing means on a side of a printing drum.

[0002]

2. Description of the Related Art Generally, a stencil printing apparatus includes a plate cylinder for winding a master having a plate made thereon, ink supply means arranged in the plate cylinder and supplying ink to the master wound on the plate cylinder. A press roller as a pressing means capable of coming and going with respect to the plate cylinder at a position facing the ink supply means; printing is performed on a sheet at a printing unit where the plate cylinder and the press roller face each other; There is a known one located substantially vertically below the rotation center of the trunk. The press roller presses the paper toward the outer peripheral surface of the plate cylinder to perform printing.
A rubber roller of about 50 mm is used. Because the plate cylinder is wound around a pre-made master with a clamper,
When the clamper comes to a position facing the press roller due to the rotation of the plate cylinder, the press roller is separated from the plate cylinder to avoid interference with the clamper. In general, the press roller is pressed against the plate cylinder by a printing pressure spring in a normal state. Accordingly, the press roller is separated in synchronization with the approach of the clamper every one rotation of the plate cylinder, and after passing through the clamper, contacts the outer peripheral surface of the plate cylinder by the urging force of the printing pressure spring.

[0003]

At the time of this contact, abrupt contact with the plate cylinder generates noise, and image unevenness may occur due to the press roller bounding to the plate cylinder peripheral surface. . Since such a problem is caused by the sum of the mass of the press roller and the printing pressure for image transfer, it is conceivable to reduce the mass of the press roller as a countermeasure. However, since a rubber roller is suitable in terms of material, cost and the like in order to fulfill the function as a press roller, it is not easy to reduce the mass of the press roller.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stencil printer capable of preventing noise and image unevenness caused by the contact of a press roller with a plate cylinder.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a plate cylinder for winding a master having a plate made thereon, and ink arranged in the plate cylinder and ink wound around the plate cylinder. Ink supply means for supplying to the master, and a pressing means capable of coming into contact with and separating from the plate cylinder at a position facing the ink supply means, and a printing unit in which the plate cylinder and the pressing means face each other. In a stencil printing apparatus that performs printing on paper, the printing unit is located on a side of a rotation center of the plate cylinder.

According to a second aspect of the present invention, there is provided the stencil printing machine according to the first aspect, wherein one of the plate cylinders is provided. According to a third aspect of the present invention, in the stencil printing machine according to the first aspect, a plurality of the plate cylinders are provided, and the plate cylinders are arranged in a substantially vertical direction. Claim 4
According to another aspect of the present invention, there is provided a stencil printing apparatus according to any one of the first to third aspects, further comprising a transport belt that passes the printing section and transports a sheet.

According to a fifth aspect of the present invention, in the stencil printing apparatus of the fourth aspect, the transport belt is an electrostatic attraction belt that electrostatically attracts and transports the sheet. According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fifth aspect, a charging device for charging the electrostatic attraction belt and a static eliminator for removing the static electricity of the electrostatic attraction belt are provided. I do.

[0008] The invention according to claim 7 provides the invention according to claims 1 to 6.
In the stencil printing apparatus according to any one of the above, a plate cylinder support for supporting the plate cylinder, and a second position for opening the stencil printing apparatus with a first position capable of printing the plate cylinder support. It is characterized in that it has a supporter supporting means for rotatably supporting the plate cylinder above the plate cylinder and an attaching / detaching means for detachably supporting the plate cylinder with respect to the plate cylinder support. And According to an eighth aspect of the present invention, in the stencil printing machine according to the seventh aspect, the attachment / detachment means is located substantially vertically above the rotation center of the plate cylinder in the second position.

According to a ninth aspect of the present invention, in the stencil printing machine according to the eighth aspect, the stencil printing machine further comprises a plate making device for making a master and a plate discharging device for discharging a used master. It is characterized by being rotatable together with the plate cylinder. The invention according to claim 10 is the first invention.
A stencil printing apparatus according to any one of claims 1 to 9,
It has a paper discharge unit on which printed paper is stacked, and an operation panel for performing a printing operation, and the operation panel is arranged near the paper discharge unit.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, the overall configuration of a double-cylinder stencil printing apparatus to which the present invention is applied will be described together with a stencil printing operation.
In FIG. 1, reference symbol A indicates a double-cylinder stencil printing machine to which the present invention is applied. As shown in FIG. 1, this double-cylinder stencil printing apparatus A has two first plate cylinders 1a arranged in a substantially vertical direction.
(Hereinafter simply referred to as "plate cylinder 1a") and second plate cylinder 1b.
(Hereinafter, simply referred to as “plate cylinder 1b”), and is configured to be capable of simultaneous multi-color printing, in this embodiment, simultaneous two-color printing. By arranging a plurality of plate cylinders in the vertical direction, the stencil printing apparatus can be installed more horizontally than in the case where a plurality of stencil printing apparatuses are connected in the horizontal direction to perform simultaneous multicolor printing, as disclosed in JP-A-5-254237. The workability is improved by reducing the area and eliminating the moving distance of the operator when aligning the images while viewing the discharged print image. The printing units 61a and 61b for performing printing include the plate cylinders 1a and 1b.
It is located on the side of the rotation center of b. These plate cylinders 1a, 1b
Have substantially the same function and configuration. Similarly, ink supply means, a plate making device, a plate discharging device, and the like, which will be described later, are provided around the inside and outside of the plate cylinder 1a, and ink supply means, a plate making device, which will be described below, which are disposed around the inside and outside of the plate cylinder 1b. And the plate discharging device, etc., have substantially the same function and configuration, so that they are distinguished by adding a code a or b to the end of the same code, and when one of them is described in detail, The other description will be omitted as much as possible to avoid redundant description.

The double-cylinder stencil printing apparatus A has the structure of a well-known thermosensitive digital stencil printing apparatus. The double-cylinder stencil printing machine A is a master-made master 33 (see FIG. 5).
Drum 1a for winding the master 33 around the outer peripheral surface, a plate making device 41a disposed on the lower right side of the plate cylinder 1a to make the master 33, and a used master disposed on the upper right side of the plate cylinder 1a to transfer the used master to the plate cylinder 1.
a plate discharging device 42a for stripping and discharging plate from a
1a, a paper feeding device 20 for feeding printing papers 22 stacked on a paper feeding tray 21 and a printing drum 22 fed from the paper feeding device 20 by electrostatic attraction. 1
a endless electrostatic attraction belt 10 as a transport belt for transporting in the order of a and 1b, and the printing paper 22 arranged and fed to the left of the plate cylinder 1a on a plate-formed master 33 on the plate cylinder 1a. Printing pressure device 32a for printing by pressing
And the plate cylinder 1b for winding the plate-making master 33 around the outer peripheral surface
A plate making device 41b arranged on the lower right side of the plate cylinder 1b to make the master 33; and a plate discharging device 42b arranged on the upper right side of the plate cylinder 1b to peel and discharge the used master from the plate cylinder 1b. A printing pressure device 32b that performs printing by pressing the fed printing paper 22 disposed on the left side of the plate cylinder 1b against a master 33 on the plate cylinder 1b that has been made, and a double-cylinder stencil printing device A. It is mainly composed of a paper output tray 37 as a paper output unit that is disposed above and that prints the printing paper 22 on which multicolor printing has been performed by the printing pressure device 32a and the printing pressure device 32b.

A document reading device 11 for reading an image of a document is provided above the double-cylinder stencil printing apparatus A, and a printing operation is performed by operating the double-cylinder stencil printing apparatus A near a lower portion of the paper discharge tray 37. Operation panels 12 for performing the operations are provided.

The operation of the double-cylinder stencil printing apparatus A will be described including the detailed configuration of each of the above-described apparatuses. The plate cylinder 1a has a well-known porous cylindrical shape, and is supported rotatably around a drum shaft 2a. The plate cylinder 1a is rotated by a main motor (not shown). On one bus line of the outer periphery of the plate cylinder 1a,
Openable and closable clamper 5a for clamping the tip of the master
Is provided. As shown in FIG. 5, the clamper 5a
Is pivotally mounted on the plate cylinder 1a by a clamper shaft 6a, and is opened and closed at a predetermined position by opening / closing means (not shown) provided at an appropriate position around the outer periphery of the plate cylinder 1a. Plate cylinder 1
Inside a, an ink supply means for supplying ink from the inner peripheral surface to the outer peripheral surface of the plate cylinder 1a is provided. In the ink supply means in the plate cylinder 1a, for example, black (Bl) color ink is used as the first color ink.
In the ink supply means b, for example, magenta (M) color ink is supplied as the second color ink.

As the master 33, a master in which Japanese paper or the like is bonded as a porous support to a thermoplastic resin film such as polyester is used. The master 33 is not limited to the above-mentioned one, and it is also possible to use a very thin one consisting essentially of a thermoplastic resin film.

First, when an operator sets a document to be printed on a document tray (not shown) of the document reading device 11 and presses a start key (not shown) on an operation panel 12 for starting plate making, the plate discharging process is started. Plate cylinders 1a and 1b
Is similarly executed. The plate cylinder 1a rotates in a counterclockwise direction opposite to the arrow a direction indicating the clockwise direction in the figure,
The used masters wound on the outer peripheral surface of the plate cylinder 1a are gradually peeled off from the outer peripheral surface of the plate cylinder 1a, and are conveyed while each of the plate discharging boxes of the plate discharging devices 42a and 42b (not shown).
The plate discharging process is completed by being discharged into the inside.

In parallel with the plate discharging process, the original reading section 11 operates to read the original. The detailed configuration and operation related to the original reading are performed by, for example, a known “reduced original reading method”, and the image read from the original is finally converted to a photoelectric conversion device such as a CCD (charge-coupled device). Photoelectric conversion is performed by an image sensor including a conversion element. The electric signal photoelectrically converted by the image sensor is transmitted to an analog / digital (A / D) conversion board (not shown) to be converted into a digital image signal.

The document reading section 11 has a configuration having various functions for color separation required for multicolor overprinting, for example, a plurality of color filters described in Japanese Patent Application Laid-Open No. 64-18682 can be switched. A filter unit having the same function and configuration as a controllable filter unit is disposed on an optical path between a mirror group and a lens (both not shown). And the detailed description is omitted.

In parallel with the original reading operation, both plate making devices 41a and 41a are used on the basis of digitalized image signals.
In step b, the same plate making and plate supplying steps are performed. As shown in FIG. 5 as a representative of the plate making apparatus 41a, the master 33 is transported to the downstream side of the master transport path by the rotation of the flat thermal head 13, the platen roller 14 and the delivery roller pair 15 pressed against the thermal head. Is done. With respect to the master 33 conveyed in this manner, the thermal head 1
3, a large number of minute heating elements arranged in a line in the main scanning direction are subjected to various processes by the A / D conversion board and the subsequent plate-making control board (not shown), and are sent to the digital image signal. , And the thermoplastic resin film of the master 33 that is in contact with the heat-generating element is melt-punched. In this manner, the image information is written as a punching pattern by the position-selective fusion punching of the master 33 according to the image information. The feed of the master 33 by these rollers is controlled so that the master between the tension roller pair 19 and the feed roller pair 15 is slackened.

The leading end of the master 33 on which the image information is written and made is sent out toward the outer peripheral side of the plate cylinder 1a by rotation of the feed roller pair 15, and the plate in the plate feeding position shown in the figure. The expanded clamper 5a of the trunk 1a
Move towards. At this time, the used master 33 has already been removed from the plate cylinder 1a by the plate discharging process. On the other hand, the leading end of the master 33 on which the plate has been made on the plate cylinder 1b side is fed toward the outer peripheral side of the plate cylinder 1b by the rotation of the feed roller pair 15, and the expanded clamper of the plate cylinder 1b in the plate feeding position state. 5b.

When the leading end of the master 33, which has been made, is clamped by the clamper 5a at a predetermined timing, the plate cylinder 1a gradually rotates the master 33 which has been made on the outer peripheral surface while rotating in the direction of arrow a in the figure. Wrap around. Since the master 33 between the tension roller pair 19 and the delivery roller pair 15 is in a slack state, excessive tension due to rotation of the plate cylinder 1a does not act on the master 33 during this winding. The rear end of the master 33 is
Movable blade 1 arranged in plate making device 41a after plate making is completed
When the master 33 is completely cut on the outer peripheral surface of the plate cylinder 1a by being cut to a predetermined length by the operation of the cutting means 18 composed of the fixed blade 6 and the fixed blade 17, the so-called plate feeding process is completed.

When the master 33, which has been made in this way, is wound around the outer peripheral surfaces of the plate cylinders 1a and 1b, respectively,
The plate supplying process is completed, and the printing process is started. The paper feed tray 21 is raised by well-known means (not shown) until the uppermost printing paper 22 stacked on the paper feed tray 21 contacts the call roller 23. The uppermost printing paper 22 that is in contact with the call roller 23 is conveyed by the rotation of the call roller 23, and the separation roller pair 24, 2.
5 and is guided by a pair of upper and lower guide plates 28 and 27 below the pair of registration rollers 2.
It is fed to 9 and 30. At this time, the leading end of the conveyed printing paper 22 abuts on the portion just before the nip portion of the pair of registration rollers 29 and 30 and stops while being bent along a part of the guide plate 28.

The electrostatic attraction belt 10 is made of a PET film, and includes press rollers 9a and 9b, a drive roller 50,
The printing units 61 a and 61 b are stretched between the driven roller 51, the counter electrode roller 52, and the tension roller 53.
Pass through. A charging device 54 is disposed at a position facing the counter electrode roller 52, and a charge removing device 55 is disposed near the driving roller 50.

The charging device 54 is of a non-contact type corotron type that performs corona discharge, and is connected to a high-voltage power supply (not shown) for charging. This high-voltage power supply supplies a charging bias to the charging device 54, and a DC power supply is used. As the static eliminator 55, a non-contact type corotron type that performs corona discharge is employed, and is connected to a high-voltage power supply (not shown) for charging. This high-voltage power supply uses a DC power supply that supplies a charge removing bias having a polarity opposite to that of the charging bias.

The electrostatic attraction belt 10 is driven by a driving roller 50 so that the transport speed is substantially the same as the peripheral speed of the plate cylinder 1a. The material of the electrostatic attraction belt 10 is not limited to the PET film, but may be any other known material as long as it is an insulator having good chargeability. Further, the transport belt is not an electrostatic attraction belt that passes through the printing unit and transports the sheet by electrostatic attraction as in the present embodiment, but is a well-known porous belt, and the negative pressure of air by a suction fan is used. May be provided before and after the printing unit, which sucks and transports the sheet.

The printing paper 22 supplied from the paper feeding device 20 is electrostatically attracted by the electrostatic force of the electrostatic attraction belt 10 charged by the charging device 54.
Despite being conveyed in the vertical direction, it is conveyed without peeling off, and is conveyed to the next printing pressure device 32b via the printing pressure device 32a by the counterclockwise rotation of the electrostatic attraction belt 10. Since the tension roller 53 is supported by a spring 53a having one end fixed to a fixing member 57 on the main body side of the double-cylinder stencil printing apparatus A, the tension of the electrostatic attraction belt 10 is reduced by the press rollers 9a and 9b.
It is kept constant even when approaching and separating from a and 1b. The charging by the charging device 54 is performed smoothly because the counter electrode roller 52 is provided.

When the printing operation is started, the first color plate cylinder 1a starts rotating at the printing rotation speed. On the inner peripheral side of the plate cylinder 1a, black ink is supplied from an ink supply distributor (not shown) to an ink reservoir Ia formed between the ink roller 3a and the doctor roller 4a as ink supply means. The color ink is kneaded and extended by the rotation of the ink roller 3a and the doctor roller 4a, and also uniformly adheres to the outer peripheral surface of the ink roller 3a. The remaining amount of ink is determined by an ink detecting means (for example, FIG. 2 of Japanese Patent Application Laid-Open No. 5-229243).
When the ink is low, the ink is supplied from the ink supply distributor.
In this way, ink is supplied to the inner peripheral side of the plate cylinder 1a by the ink roller 3a that rotates in contact with the inner peripheral surface while rotating in the same direction as the rotational direction of the plate cylinder 1a and in synchronization with the rotational speed of the plate cylinder 1a. You.

The printing pressure device 32a mainly includes an ink roller 3a, a press roller 9a, a press roller bracket 11a, a press roller tension including a spring (not shown), and a press roller cam (not shown).
The press roller 9a has a function as a pressing unit that presses the printing paper 22 fed by the electrostatic suction belt 10 together with the electrostatic suction belt 10 against the plate cylinder 1a to form a print image on the printing paper 22. Press roller 9a
Is rotatably supported at one swing end of the press roller bracket 11a, and is provided on the outer peripheral surface of the plate cylinder 1a by a well-known mechanism including a press roller tension and a press roller cam.

The printing paper 22 is a pair of registration rollers 29,
At 30 at a predetermined timing synchronized with the rotation of the plate cylinder 1 a, the sheet is conveyed between the driven roller 51 and the pressing roller 31, and is attracted to the electrostatic attraction belt 10. Further, when the press roller 9a is fed between the plate cylinder 1a and the press roller 9a in the printing pressure device 32a, that is, to the printing unit 61a, the press roller 9a separated from the outer peripheral surface side of the plate cylinder 1a in synchronization with this. Is swung, and is pressed against the master 33 on which the plate has been made and wound on the outer peripheral surface of the plate cylinder 1a. As a result, the master 33, which has completed plate-making, is moved by the adhesive force due to the viscosity of the ink oozing out from the porous portion of the plate cylinder 1a.
a, and at the same time, the ink oozes out from the perforated pattern portion of the stencil master 33, and the oozed ink is transferred to the surface of the printing paper 22, and
A desired printed image of a color is formed. Press roller 9a
Abuts against the plate cylinder 1a from the side of the rotation center of the plate cylinder 1a, so that most of the mass of the press roller 9a is applied to the press roller bracket 11a, and the impact on the plate cylinder 1a is greatly reduced. Is done.

Printing paper 2 on which a printed image of the first color is formed
2 is conveyed toward the next printing pressure device 32b by the counterclockwise rotation of the electrostatic attraction belt 10. During printing, the plate cylinders 1a and 1b rotate synchronously. Plate cylinder 1
On the inner peripheral side of the plate cylinder 1b, the ink of the second color is applied to the plate cylinder 1b by an ink roller 3b that rotates in synchronization with the rotation speed of the plate cylinder 1b and contacts the inner peripheral surface while having the same configuration and operation as the plate cylinder 1a. Is supplied to the inner peripheral side of.

Then, the printing paper 22 is moved by the electrostatic attraction belt 10 at a predetermined timing synchronized with the rotation of the plate cylinder 1b to the plate cylinder 1b and the press roller 9 in the printing pressure device 32b.
b, that is, when the press roller 9b is fed to the printing unit 61b, the press roller 9b that has been separated from the outer peripheral surface of the plate cylinder 1b swings in synchronism with this, and the outer periphery of the plate cylinder 1b is rotated. It is pressed against the master 33 that has been made and is wound around the surface. As a result, the master 33 that has completed the plate making is formed by the adhesive force due to the viscosity of the ink oozing out from the porous portion of the plate cylinder 1b.
Comes into close contact with the outer peripheral surface of the plate cylinder 1b, and at the same time, the ink oozes out from the perforated pattern portion of the master 33 that has been made, and the oozed ink is transferred to the surface of the printing paper 22, and the ink of the second color is used. A print image is formed.

Printing paper 2 on which a printed image of the second color is formed
When the leading end of the print paper 2 reaches a position near the neutralizing device 55, static elimination is performed by the neutralizing device 55, and adsorption of the printing paper 22 to the electrostatic attraction belt 10 is released. Printing paper 2
When the leading end of drive roller 2 comes to drive roller 50, drive roller 5
It is separated and separated from the electrostatic attraction belt 10 by a curvature of zero. The printed printing paper 22 that has been separated and separated is ejected by the jump table 56 near the driving roller 50 to the discharge tray 3.
7 and is stacked on the discharge tray 37. The electrostatic attraction belt 10 that has passed through the driving roller 50 is cleaned by the cleaning roller 58 to prepare for the next charging. Thus, the so-called “printing” or “test printing” is completed.

Next, the number of prints is set using a ten-key (not shown) on the operation panel 12, and when the start key is pressed again, the same processes as those for the trial printing are performed. This process is repeated for the number of copies, and the entire stencil printing process is completed. The paper ejection tray 37 can be moved up and down by a well-known mechanism in accordance with the thickness of the stacked paper and the like, as indicated by an arrow b, thereby improving work efficiency. The operation panel 12 is arranged near the lower part of the paper discharge tray 37. Reference numerals 59 and 60 indicate the installation surface on which the double-cylinder stencil printing apparatus A is installed and the position of the head of a general adult, respectively. The head position 60 is located above the paper discharge tray 37, and the paper discharge tray 37 and the operation panel 12 can be visually checked at the same time. Therefore, workability is improved when it is necessary to adjust the image position in test printing. Operation panel 1
The arrangement position of 2 is not limited to a lower position as long as it is in the vicinity of the discharge tray 37, and may be any position that can be viewed simultaneously with the discharge tray 37.

Plate cylinders 1a and 1b, plate making devices 41a and 41
b, plate discharging devices 42a, 42b, attaching / detaching means 62 described later
a and 62b are supported by a plate cylinder support 63. The plate cylinder support 63 is separated from the plate cylinders 1 a, 1
It is rotatably supported above the double cylinder type stencil printing apparatus A body above b. The support body support means 64 holds the plate cylinder support body 63 between a printable first position shown in FIG. 1 and a second position for opening the double cylinder stencil printing apparatus A shown in FIG. can do. The attachment / detachment means 62a and 62b removably support the plate cylinders 1a and 1b with respect to the plate cylinder support 63 and the body of the double-cylinder stencil printing apparatus A, respectively. In the second position, the attachment / detachment means 62a, 62b are respectively located substantially vertically above the rotation center of the plate cylinders 1a, 1b.

The attachment / detachment means 62a and 62b have substantially the same configuration, and therefore, the attachment / detachment means 62a is shown in FIGS. The attachment / detachment means 62a includes support plates 65, 66 for rotatably supporting both ends of the drum shaft 2a, a slider 67 having both upper portions of the support plates 65, 66 fixed thereto, and a slider 67 fixed to the plate cylinder support 63. And a guide rail 68 that slidably supports the guide rail 68. When the slider 67 and the guide rail 68 are engaged with each other, the roller 69 rotatably provided at the end of the slider 67 rides on the upper surface of the horizontal plate 70 integrated with the guide rail 68, and A slider 6 is provided above a rotatable roller 71.
7 is on the bottom. The other constructions relating to the attaching / detaching means 62a and 62b are described in Japanese Utility Model Laid-Open Publication No. Sho 61-85462, and the detailed description thereof will be omitted.

In the second position, the attaching / detaching means 62a, 62b
Are positioned substantially vertically above the center of rotation of the plate cylinders 1a and 1b, so that the plate cylinder 1a is supported by the guide rail 68 in a state of being hung via a slider 67 and the like, and is smoothly rotated by the rotation of the rollers 69 and 71. The slide is performed, and the plate cylinders 1a and 1b can be easily replaced.

When the plate cylinder 1a is mounted, the drum shaft 2a
Are fitted to drum bearings 76 provided on the plate cylinder support 63, and fixed pins 72, 7 provided on the support means 65.
3 engages with fixing holes and fixing holes 75 (not shown) provided at positions corresponding to the fixing pins 72 and 73 of the plate cylinder support 63, respectively. That is, the plate cylinder support 6 of the plate cylinder 1a
The position of attachment to 3 is determined by these fixing pins and fixing holes. This is the same for the plate cylinder 1b.

When the plate cylinder support 63 and the support support means 64 are not provided and the second position does not exist,
Since the attachment / detachment means 62a and 62b are respectively located on the sides of the rotation center of the plate cylinders 1a and 1b, even if the plate cylinders 1a and 1b are to be slid, the plate cylinders 1a and 1b are not in a hung state. Is not performed well, and the attaching / detaching means 62a and 62b are attached to the plate cylinders 1a and 1b, respectively.
Plate cylinders 1a, 1b
Since the ink supply means having a relatively large mass is provided on the side of the rotation center inside, the center of gravity cannot be balanced in the state where the plate cylinders 1a and 1b are hung, and the slide is not performed well. The user must purchase a new plate cylinder, slide rail, and the like, which increases the burden on the user.

However, in the double cylinder type stencil printing apparatus A of the present embodiment to which the present invention is applied, in the second position, the ink supply means is vertically below the rotation center of the plate cylinders 1a and 1b. Even if a plate cylinder having a conventional configuration is used, the center of gravity is balanced, the slide is performed smoothly, and problems such as paper jam can be dealt with by releasing the paper conveyance path.

The construction and arrangement of each of the above-mentioned apparatuses constituting the double-cylinder stencil printing apparatus A are merely examples, and may be constituted by other known apparatuses and various arrangements. It goes without saying that it is good. For example, the double-cylinder type stencil printing apparatus A is not limited to the above-described thermosensitive digital stencil printing type stencil printing apparatus. The master may be prepressed and supplied, or the master may be discharged.
b and the plate discharging devices 42a and 42b may not necessarily be provided in the device main body. The data for plate making may be data read by the document reading device as described above, or data created by a computer or the like.

Further, multi-color printing including full-color printing can be performed by setting the number of plate cylinders to three or more, or a stencil having one plate cylinder as in a single-cylinder stencil printing apparatus B shown in FIG. It can also be a printing device. The single cylinder type stencil printing apparatus B is different from the double cylinder type stencil printing apparatus A shown in FIG. 1 and the like in that only one plate cylinder is provided, and the plate making device and the plate discharging device are located above the plate cylinder. The operation and function of each component are the same as those of the double-cylinder stencil printing apparatus A. Therefore, each configuration of the single-cylinder stencil printing apparatus B corresponds to that of the corresponding double-cylinder stencil printing apparatus A. Only the same reference numerals as in the configuration are used, and the description is omitted. In this embodiment, a pressing roller is shown as a pressing means.
An impression cylinder described in JP-A-158 may be used.

[0041]

According to the first aspect of the present invention, since the contact of the press roller with the plate cylinder is performed from the side of the rotation center of the plate cylinder, the mass of the press roller with respect to the plate cylinder is canceled, and Since the impact on the cylinder is greatly reduced, it is possible to provide a stencil printing apparatus capable of preventing noise and image unevenness caused by the contact of the press roller with the plate cylinder.

According to the second aspect of the present invention, there can be provided a single cylinder type stencil printing machine in which the press roller abuts on the plate cylinder from the side of the rotation center of the plate cylinder. The degree of freedom in designing the printing device is increased.

According to the third aspect of the present invention, since the plurality of plate cylinders are arranged side by side in the vertical direction, compared with the case where a plurality of stencil printing apparatuses are connected in the horizontal direction for performing multicolor printing. It is possible to provide a stencil printing apparatus that can reduce the installation area, and can improve the workability by eliminating the moving distance of the operator when aligning the images while viewing the discharged print images.

According to the fourth aspect of the present invention, since printing is performed by the paper passing through the printing section while being held by the transport belt, the configuration for transporting the paper can be simplified, and the transport of the paper can be simplified. Since the configuration in the path is simplified, it is possible to provide a stencil printing apparatus capable of reducing problems such as jamming during sheet conveyance.

According to the fifth aspect of the present invention, since the paper is electrostatically attracted, the paper can be transported while being securely held on the belt, and the paper is prevented from winding up or slipping around the plate cylinder in the printing unit. A stencil printing device capable of being provided can be provided.

According to the sixth aspect of the present invention, since the electrostatic attraction belt is charged and neutralized, the supply of the paper to the belt and the separation of the paper from the belt are reliably performed, thereby preventing the problem related to the paper conveyance. And a stencil printing apparatus capable of performing the stencil printing. .

According to the seventh aspect of the present invention, the plate cylinder support for supporting the plate cylinder rotates and opens the stencil printing apparatus in the second position, so that when a jam occurs in the paper transport path. Of paper jams, especially when jams occur between plate cylinders of a multi-cylinder stencil printing machine It is possible to provide a stencil printing apparatus that can be freely used.

According to the eighth aspect of the present invention, since the attachment / detachment means is located vertically above the rotation center of the plate cylinder in the second position, workability is good and the conventional plate cylinder and attachment / detachment means can be used. It is possible to provide a stencil printing apparatus capable of easily attaching and detaching a plate cylinder and preventing an increase in cost due to common use of components.

According to the ninth aspect of the present invention, a plate making apparatus,
Since the plate discharging device is rotated together with the plate cylinder, maintenance of the plate making device and the plate discharging device is facilitated, and the plate making device and the plate discharging device located around the plate cylinder are moved together with the plate cylinder, so that rotation is possible. A stencil printing apparatus can be provided in which the mechanism of the apparatus is prevented from becoming complicated.

According to the tenth aspect of the present invention, since the operation panel for performing the printing operation is arranged near the paper discharge unit, the user can perform a printing operation such as image position adjustment while watching the printed image on the discharged printing paper. It is possible to provide a stencil printing apparatus that can perform the stencil printing with good workability.

[Brief description of the drawings]

FIG. 1 is a front view showing the outline of a double-cylinder stencil printing machine to which the present invention is applied.

FIG. 2 is a front view showing a second state of the double-cylinder stencil printing machine shown in FIG. 1;

FIG. 3 is a perspective view schematically showing an attaching / detaching means of the double-cylinder stencil printing machine shown in FIG. 1;

FIG. 4 is a side view schematically showing an attaching / detaching means of the double-cylinder stencil printing machine shown in FIG.

5 is an enlarged front view of an internal configuration of a plate making device and a clamper of the double cylinder type stencil printing machine shown in FIG.

FIG. 6 is a front view showing the outline of a single cylinder type stencil printing machine to which the present invention is applied.

[Explanation of symbols]

1, 1a, 1b plate cylinder 3, 3a, 3b ink roller 4, 4a, 4b doctor roller 9, 9a, 9b as ink supply means press roller 10, transport belt 12, operation panel 22, paper 37, as paper discharge section Discharge trays 41, 41a, 41b plate making device 42, 42a, 42b plate discharging device 54 charging device 55 static eliminator 61, 61a, 61b printing unit 62, 62a, 62b attaching / detaching means 63 plate cylinder support 64 support supporting means A, B Stencil printing machine

Claims (10)

[Claims] 1. A plate cylinder on which a pre-made master is wound, ink supply means arranged in the plate cylinder for supplying ink to the master wound on the plate cylinder, and a position opposed to the ink supply means. A stencil printing apparatus that has a pressing unit that can be brought into contact with and separated from the plate cylinder, and performs printing on paper in a printing unit where the plate cylinder and the pressing unit are opposed to each other. A stencil printing device, which is located on the side of the center. 2. A stencil printing machine according to claim 1, wherein said stencil printing machine has one of said plate cylinders. 3. A stencil printing machine according to claim 1, wherein said stencil printing machine has a plurality of said plate cylinders, and said plate cylinders are arranged in a substantially vertical direction. 4. The stencil printing apparatus according to claim 1, further comprising a transport belt that passes through said printing section and transports a sheet. 5. A stencil printing apparatus according to claim 4, wherein said transport belt is an electrostatic attraction belt for electrostatically attracting and transporting a sheet. 6. A stencil printing machine according to claim 5, further comprising a charging device for charging said electrostatic attraction belt and a charge removing device for removing said electrostatic attraction belt. apparatus. 7. A stencil printing apparatus according to claim 1, wherein said plate cylinder support supports said plate cylinder, and said plate cylinder support can be printed in a first position. And a second position in which the stencil printing apparatus is opened, a support supporting means rotatably supporting the plate cylinder above the plate cylinder, and detachably mounting the plate cylinder with respect to the plate cylinder support. A stencil printing device comprising: a detachable means for supporting. 8. A stencil printing apparatus according to claim 7, wherein said attaching / detaching means is located substantially vertically above a rotation center of said plate cylinder in said second position. 9. A stencil printing machine according to claim 8, further comprising a plate making device for making a master and a plate discharging device for discharging a used master, wherein said plate making device and said plate discharging device are rotated together with said plate cylinder. A stencil printing apparatus characterized in that it is possible. 10. A stencil printing apparatus according to claim 1, further comprising a discharge section on which printed paper is stacked, and an operation panel for performing a printing operation. A stencil printing machine, wherein an operation panel is arranged near the paper discharge section.