JPH1134467A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate image double printing by stabilizing a conveying time of a sheet from a plate cylinder of an upstream side to that of a downstream side. SOLUTION: The stencil printer comprises plate cylinders 1A, 1B arranged in parallel to be rotatably driven in a conveying direction X of a sheet 22, a suction conveying unit 17a disposed between both the plates to suction convey the sheet 22 to be printed by the plate 1A of an upstream side toward the plate 1B of a downstream side, and an intermediate air supply means 45 provided above the unit 17a to supply an air flow generated from an air supply source 46 to a sheet conveying passage 47 formed between the plate 1A of the upstream side and the plate 1B of the downstream side via channels 55, 57, 58, 59 formed of an air guide member 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine having a plurality of plate cylinders and capable of performing multicolor printing.

[0002]

2. Description of the Related Art As a simpler printing method than before, a digital thermosensitive stencil printing apparatus has been known. In a stencil printing machine, a thermal head in which fine heating elements are arranged in a line is brought into contact with a heat-sensitive stencil master, and the master is conveyed while energizing the heating elements in a pulsed manner according to image information.
The master is melt-punched to make a plate, and the plate-making master is wound around the outer peripheral surface of a porous cylindrical plate cylinder, ink is passed through the perforated portion and transferred to paper to form a printed image. . Printing by this type of stencil printing apparatus is performed by an ink roller disposed in the plate cylinder and a press roller which is disposed near the outer peripheral surface of the plate cylinder so as to face the roller and is pressed against the outer peripheral surface as needed. The ink on the ink roller is permeated from the perforations of the plate-made master wound around the outer peripheral surface of the plate cylinder to the outer peripheral surface side of the master to transfer to the paper.

[0003] The paper to be printed adheres to the plate cylinder due to the viscosity of the ink and the like.
In the invention described in Japanese Patent Application Laid-Open Publication No. H10-260, a separation claw is arranged close to the outer peripheral surface of the plate cylinder, air is blown from a blowing source between the outer peripheral surface of the plate cylinder and the separation claw, and a suction device is provided below the press roller. Is arranged to separate and separate the attached paper from the plate cylinder. According to the invention described in Japanese Utility Model Publication No. 2-35717, a separation claw is disposed close to the outer peripheral surface of a plate cylinder, and a suction conveyance device is provided between the plate cylinder and a discharge portion of a printed sheet. The sheet peeled off from the drum is adsorbed by the suction conveyance device and conveyed to the paper discharge unit.

[0004] Japanese Patent Application Laid-Open No. Hei 6-32038 discloses that
A plurality of plate cylinders, each of which has a plate-making master made in accordance with a color image and wound on the outer peripheral surface, are arranged in parallel at intervals in the sheet conveyance direction, and a plate positioned between both plate cylinders on the upstream side in the conveyance direction. A suction conveyance device that suctions and conveys the paper printed on the cylinder toward the plate cylinder positioned on the downstream side in the conveyance direction is provided, and conveys the paper between the plate cylinders without contacting the upper surface of the paper (print image surface); There has been proposed a stencil printing apparatus capable of simultaneous multi-color printing by feeding a next printing cylinder to a corresponding press roller. In a stencil printing apparatus having a plurality of plate cylinders as described above, the paper conveyance speed by the suction conveyance device is constant, and each plate cylinder is rotationally driven at a constant speed in synchronization with the paper feed timing for feeding the paper. It is provided so that the paper and the leading edge of the image on each plate cylinder coincide with each other at the printing position of each plate cylinder.

[0005]

A problem with a stencil printing apparatus capable of simultaneous multicolor printing is that the ink of the paper printed on the upstream plate cylinder adheres to the master on the downstream plate cylinder, That is, so-called image double printing occurs in which the attached ink is transferred at the time of printing on the next transported paper.

In the case of stencil printing, an ink image corresponding to a stencil image is printed by pressing a sheet against a plate cylinder with a press roller to cause ink to adhere to the sheet and print the image depending on the size of the ink image and the size of the sheet. The areas are different and the amount of ink transferred to the paper varies. For this reason, the timing at which the paper adhering to the plate cylinder at the time of printing peels off from the plate cylinder varies depending on the amount of transferred ink, and a conveyance delay to the plate cylinder located downstream in the conveyance direction occurs. If the paper is thick and stiff, it will separate well from the plate cylinder even if it adheres to the plate cylinder due to the viscosity of the ink. Separation of the paper from the drum is delayed.

In addition, since various types of paper are used for printing, the suction / conveying device cannot perform suction and suction properly due to the difference in the type of paper, causing flapping and the like, resulting in insufficient transport performance.

When the leading end of the sheet enters the downstream plate cylinder, it separates from the suction and conveyance device, so that its position is not stable, and the press roller is moved and pressed against the downstream plate cylinder. In such a case, the intrusion of the sheet between the printing drum and the press roller on the downstream side, which is the printing position, is reduced, and the leading end position of the sheet is shifted.

[0009] Due to such delays of separation of the sheet from the plate cylinder, insufficiency of the sheet conveyance performance, and poor penetration of the sheet into the printing position of the downstream plate cylinder, the reason for this is that the sheet is transferred to the downstream plate cylinder. The paper transport time varies, which results in image double printing.

The present invention eliminates the deviation of the leading edge position of the sheet due to the winding of the sheet on the upstream plate cylinder, as well as the penetration of the leading edge of the sheet into the downstream plate cylinder and the gap between the upstream and downstream plate cylinders. It is an object of the present invention to provide a stencil printing apparatus capable of improving the paper transport performance, stabilizing the paper transport timing to a downstream plate cylinder, and reducing image double printing.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a plate cylinder having a prepressed master wound on an outer peripheral surface thereof is rotated at a distance in a sheet conveying direction by rotating a plate cylinder. A stencil plate in which a plurality of the plate cylinders are arranged in parallel, and a suction conveyance device that suctions and conveys a sheet printed by the plate cylinder positioned upstream in the conveyance direction toward the plate cylinder positioned downstream in the conveyance direction is provided between the two plate cylinders. In a printing apparatus, a blowing source for generating an air flow, and a flow path for blowing the air flow from the blowing source to a sheet transport path formed between the upstream and downstream plate cylinders above the suction transport device. And an air blowing member having the air guiding member.

According to a second aspect of the present invention, in the stencil printing machine according to the first aspect, a separation claw provided so as to be able to approach and separate from the upstream plate cylinder is provided between the two plate cylinders, and is formed by a wind guide member. The air outlet from the air source can be blown in a tangential direction at a point where a line connecting the tip of the separation claw and the rotation center of the upstream plate cylinder and the outer peripheral surface of the plate cylinder intersect. Provided.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the stencil printing apparatus described in the above, the wind guide member includes an upstream end of a sheet conveyance path located near the upstream plate cylinder, a downstream end of the sheet conveyance path located near the downstream plate cylinder, and suction conveyance. A flow path for blowing an air flow from a blowing source is formed in at least two portions of the transfer surface of the apparatus.

According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first, second or third aspect, a sheet information input means for inputting sheet information, and a blower is provided in accordance with the input information from the sheet information input means. Control means for controlling the operation of the source.

According to a fifth aspect of the present invention, in the stencil printing machine according to the fourth aspect, there is provided an air flow rate setting means connected to the control means, and the control means operates in response to a signal from the air flow rate setting means. Is controlled individually as input information from the paper information input means.

According to a sixth aspect of the present invention, in the stencil printing machine according to the first, second or third aspect, a plurality of the wind guide members are provided, and the plurality of wind guide members are arranged in a direction orthogonal to the tangential direction. Is provided with a variable mechanism that enables parallel movement.

According to a seventh aspect of the present invention, in the stencil printing apparatus according to the sixth aspect, a sheet information input means for inputting the information of the sheet, and a variable mechanism or a variable mechanism in accordance with the input information from the sheet information input means. There is provided control means for controlling the operation of the mechanism and the air supply source.

According to an eighth aspect of the present invention, in the stencil printing machine according to the seventh aspect, there is provided an air volume setting means connected to the control means. The operation or the operation of the air supply source and the variable mechanism is configured to be controlled by the control unit separately from the input information from the sheet information input unit.

The invention according to claim 9 is the invention according to claim 4 or 7.
In the stencil printing apparatus described above, the paper information input means comprises a paper identification means for outputting a signal corresponding to the type of paper to the control means and a paper size setting means for outputting a signal corresponding to the paper size to the control means. Have been.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A stencil printing apparatus according to the present invention
A plurality of plate cylinders, on which a pre-made master is wound around the outer peripheral surface and driven to rotate, are arranged in parallel at intervals in the transport direction of the paper, and a suction transport device is arranged between the two plate cylinders so as to be upstream in the transport direction. The basic configuration is that a sheet to be printed by a located plate cylinder is suctioned and conveyed toward a plate cylinder located on the downstream side in the conveyance direction, and an intermediate blower is disposed above the suction conveyance device. The intermediate blowing means includes a blowing source and a baffle member, and blows the air flow generated by the blowing source to a sheet transport path formed between the upstream plate cylinder and the downstream plate cylinder using the baffle member. A guiding channel is formed.

When the blown portion is near the separation position of the sheet at the upstream end of the sheet transport path in the plate cylinder on the upstream side, the sheet printed on the plate cylinder on the upstream side is subject to the airflow and the stiffness of the sheet. Separated from the same cylinder. If the region to be blown is the transport surface of the suction transport device, the paper peeled from the upstream plate cylinder will be pressed against the transport surface of the suction transport device by the airflow, and a reduction in transport force is reduced. So good. If the region to be blown is the downstream end of the paper transport path in the vicinity of the downstream plate cylinder, the airflow is blown to the vicinity of the downstream plate cylinder,
The air flow hits the sheet detached from the suction conveyance device, and the position thereof is stabilized, so that the sheet can easily enter the downstream plate cylinder.

In order to further enhance the separation of paper from the upstream plate cylinder, a separation claw is provided near the upstream plate cylinder so as to be able to approach and separate from the plate cylinder. The air flow from the air supply source can be distributed in the tangential direction at the point where the line connecting the rotation center and the outer peripheral surface of this plate cylinder intersects,
It is preferable to provide an outlet of a flow path formed by a baffle member so that an air flow from a blowing source is blown between the tip of the separation claw and the outer peripheral surface of the plate cylinder.

By forming a flow path for blowing the air flow from the air supply source in at least two portions that cause a delay in the conveyance of the sheet to the downstream plate cylinder by a baffle member, a plurality of channels are formed at a time for the sheet. An air stream is blown from the location. For example, when the air flow from the air supply source, the upstream end of the suction transport device located near the upstream plate cylinder, and forming a flow path with a wind guide member so as to blow to the transport surface of the suction transport device, This is effective for preventing the paper from being rolled up on the transport cylinder while preventing the paper from being wound up on the upstream plate cylinder.

The air flow from the air supply source is blown to the upstream end of the suction transfer device located near the upstream plate cylinder and the downstream end of the suction transfer device located near the downstream plate cylinder. When the flow path is formed by the air guide member, the position of the leading edge of the sheet is stabilized even when the leading edge of the sheet is out of the transport surface, while preventing the sheet from winding up on the upstream plate cylinder, and the downstream side of the plate cylinder. It is preferable to improve the penetration of the leading edge of the sheet into the paper.

The flow path formed by the baffle member is moved to the upstream end of the suction / conveyance device located near the upstream plate cylinder, the conveyance surface of the suction / conveyance device, and the suction member located near the downstream plate cylinder. If the air flow from the air supply source can be blown at once to the three parts at the downstream end of the conveyance device, the separation and separation of the plate cylinder and paper on the upstream side can be achieved.
Since the peeling property is improved, the flapping of the sheet on the conveying surface is suppressed, the conveying force is improved, and the intrusion of the sheet into the plate cylinder on the downstream side can be improved, which is more preferable.

The amount of air blown to the sheet by the intermediate blower is determined by inputting information from a sheet information input unit including a sheet identification unit that identifies the type of the sheet and a sheet size detection unit that outputs a signal corresponding to the size of the sheet. When adjusted by the control means, the air flow is increased or decreased according to the type and size of the paper and supplied to each flow path, and the paper is separated and separated from the plate cylinder on the upstream side in consideration of the type and size of the paper In addition to this, it is possible to improve the transport performance by suppressing the flapping of the paper in the suction transport means, and to enhance the penetration of the paper into the plate cylinder on the downstream side. Examples of the sheet identification unit include an optical sensor that detects the thickness of the sheet, a selection switch for manual operation that activates a control operation of each unit according to the type of the sheet, and the like. Examples of the paper size detection unit include an optical sensor that detects the size of the paper, a selection switch for manual operation that activates a control operation of each unit according to the paper size, and the like. When a selection switch (key switch) is used for the paper identification means and the paper size detection means, if only the type and size of the paper is selected, the setting of the amount of air blown to the paper can be automatically controlled according to the type and size of the paper. Become. When an optical sensor is used for the paper identification means and the paper size detection means, all the settings can be automatically controlled from the setting of the type and size of the paper to the setting of the amount of air blown to the paper.

As the air guide member, a plurality of air guide members are integrally formed in order to keep the area of the flow path constant, or the air guide member is provided so as to be movable by a variable mechanism so that the area of the flow path can be increased or decreased. It is good to In this case, when the plurality of air guide members are provided so as to be able to move in parallel in a direction perpendicular to the tangential direction of the upstream plate cylinder, the area of the blowing port for the upstream plate cylinder and the tip of the separation claw can be efficiently reduced. Since the separation / peeling performance of the printed paper on the upstream plate cylinder can be adjusted according to the type of paper, it is preferable.

In order to increase or decrease the blowing amount of the air flow on the paper, the amount of air generated from the air supply source may be adjusted instead of adjusting the area of the flow path. If the blower is electrically driven, controlling the voltage and current for this in accordance with the type and size of the paper allows the amount of air flow to be blown on the paper in accordance with the type and size of the paper, making it possible to more finely control the upstream side. This makes it possible to adjust the separation / separation of the paper from the plate cylinder, the transport force on the transport surface, and the ease of entry of the paper into the downstream plate cylinder.

In order to increase or decrease the blowing amount of the air flow on the sheet, an air volume setting means may be provided, and the variable mechanism and the air supply source may be controlled by a signal from the air volume setting means using the control means. The control of the blowing amount of the air flow to the sheet may be performed by independently connecting the air volume setting unit to the control unit and based on a signal from the air volume setting unit,
The air volume setting means, the paper identification means and the paper size setting means may be connected to the control means, and the operation may be performed in accordance with signals from these means. In this case, if the control unit is configured so that the signal from the air volume setting unit has a higher priority than the signal from the paper identification unit and the paper size setting unit, the correction cannot be completed by the air volume control by the paper identification unit and the paper size setting unit. This is preferable because it is possible to manually correct the deviation of the sheet conveyance timing with respect to the plate cylinder on the downstream side.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) The overall configuration of a double cylinder type stencil printing apparatus to which the present invention is applied and a basic stencil printing operation will be described. The double-cylinder stencil printing apparatus shown in FIG. 1 includes two plate cylinders (hereinafter, “plate cylinder 1A”, “plate cylinder 1B”) that are arranged side by side from the upstream side to the downstream side in the transport direction X of the sheet 22. ), And is configured to be capable of performing simultaneous multi-color printing (simultaneous two-color printing in this embodiment).
The plate cylinder 1A and the plate cylinder 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 later, and are provided around the inside and outside of the plate cylinder 1B. And the plate discharging device 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.
When one of them is described in detail, the other description is omitted as much as possible to avoid redundant description. In addition, a different function and configuration may be simply represented by adding a code a or b to the end of the same code.

The double-cylinder stencil printing machine has the structure of a well-known thermosensitive digital stencil printing machine. That is, the double-cylinder type stencil printing apparatus includes a plate cylinder 1A for winding the master 33a around the outer peripheral surface 1Aa, a plate-making apparatus 41a disposed above and to the right of the plate cylinder 1A for plate-making the master 33a, and disposed below the plate-making apparatus 41a. A sheet feeding device 20 that feeds the sheets 22 stacked on the sheet feeding tray 21, a plate discharging device 42 a that is disposed at the upper left of the plate cylinder 1 </ b> A and strips a used master 33 a from the plate cylinder 1 </ b> A, and discharges the plate. A printing pressure device 32a for performing printing by pressing a sheet 22 which is arranged and fed below the printing drum 1A against a master 33a on the printing drum 1A, and between the printing pressure device 32a and the printing drum 1A. A first unit U1 including a separation claw 7a for separating the printed paper 22 printed at the printing position E1 to be formed from the plate cylinder 1A, a plate cylinder 1B for winding the master 33b around the outer peripheral surface 1Ba, and a plate. A plate making device 41b arranged on the upper left of the plate 1B for making the master 33b, a plate discharging device 42b arranged on the left of the plate cylinder 1B for peeling and discharging the used master 33b from the plate cylinder 1B, and a plate discharging device 42b below the plate cylinder 1B. The master 22 on the plate cylinder 1B is used to transfer the paper 22 placed and fed to the plate cylinder 1B.
a printing pressure device 32b that performs printing by pressing against
And a separation claw 7b for separating and separating the printed paper 22 printed at the printing position E2 formed between the printing pressure device 32b and the plate cylinder 1B from the plate cylinder 1B.
A suction conveyance device 17a that conveys the printed paper 22 printed at the printing position E1 toward the printing position E2,
A sheet discharging device 35 disposed below the plate discharging device 42b and discharging the multi-color printed sheet 22 at the printing position E1 and the printing position E2 onto a sheet discharging tray 37, and a plate above the suction conveyance device 17a. It is mainly composed of an intermediate blowing means 45 provided between the trunks 1A and 1B.

Both stencil making apparatuses 41a and 41b of the stencil printing apparatus
A document reading device (not shown) for reading an image of a document and an operation panel 70 shown in FIG. 3 for operating the stencil printing device are provided above the plate discharging device 42a.

Next, the operation of the double-cylinder stencil printing apparatus will be described including the detailed configuration of each of the above-described apparatuses. Plate cylinder 1A
Has a well-known porous cylindrical shape, and is rotatably supported around the drum shaft 2a. The plate cylinder 1A is rotated in the direction of the arrow in synchronization with the plate cylinder 1B via a plate cylinder driving motor 61 shown in FIG. 2 and a well-known power transmission mechanism including a gear train and a belt and a pulley (not shown). An openable and closable clamper 5a for clamping the tip of the master 33a is provided on one generatrix of the outer peripheral surface 1Aa of the plate cylinder 1A. 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
A, the inner peripheral surface 1Ab of the plate cylinder 1A to the outer peripheral surface 1A
Ink supply means for supplying ink toward a is provided. In the ink supply means in the plate cylinder 1A, 1
For example, magenta ink is supplied as the color ink, and black ink, for example, is supplied as the second ink in the ink supply means in the plate cylinder 1B.

As the master 33a, a master in which a Japanese paper or the like is bonded as a porous support to a thermoplastic resin film such as polyester is used. Master 33a
Is not limited to the above, and a very thin film made of substantially only a thermoplastic resin film can be used.

When an operator sets a document to be printed on a document receiving table of a document reading device (not shown) and presses a plate making start key 73 shown in FIG. 3 for starting plate making, a plate discharging process is performed in both plate cylinders 1A and 1A. This is similarly performed in 1B. That is, the plate cylinder 1A rotates in the direction opposite to the direction of the arrow in the drawing (counterclockwise direction), and the used master 33a wound on the outer peripheral surface of the plate cylinder 1A is removed from the outer peripheral surface 1A of the plate cylinder 1A.
a, and is discharged into each plate discharge box (not shown) while being conveyed, and the so-called plate discharge ends.

In parallel with the plate discharging process, the original reading device 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 apparatus has a configuration having various functions for color separation necessary for multi-color 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 the controllable filter unit is disposed on an optical path between a mirror group and a lens (both not shown),
Operations such as automatic plate making and plate feeding similar to those described in the publication are performed, and detailed description thereof will be omitted.

On the other hand, in parallel with the original reading operation,
Based on the digitalized image signal, both plate making devices 4
In steps 1a and 41b, the same plate making and plate supplying steps are performed. The master 33a is rotated by a platen roller (both not shown) and a delivery roller pair (not shown) pressed against a flat thermal head provided in the plate making apparatus 41a, and the master 33a is moved to the master transport path. Transported downstream of Master 33a conveyed in this way
On the other hand, a large number of minute heating elements arranged in a line in the main scanning direction of the thermal head are subjected to various processes by the A / D conversion board and the subsequent plate making control board (not shown), and are sent. The thermoplastic resin film of the master 33a, which selectively generates heat in accordance with the received digital image signal and is in contact with the heat-generating heating element, is melt-punched. In this way, the image information is written as a perforation pattern by the position-selective fusion perforation of the master 33a according to the image information.

The leading end of the master 33a, on which the image information is written and on which the plate has been made, is sent toward the outer peripheral side of the plate cylinder 1A by the rotation of the sending roller pair, and a plate feeding guide plate (not shown). Of the plate cylinder 1A in the plate feeding position shown in FIG.
It hangs down toward a. At this time, the used master 33a has already been removed from the plate cylinder 1A by the plate discharging process. On the other hand, the stencil master 33b on the plate cylinder 1B side
Is sent out toward the outer peripheral side of the plate cylinder 1B by the rotation of the feed roller pair, and while being guided in a substantially horizontal direction by a plate feeding guide plate (not shown), the clamper 5b is moved in FIG.
Plate cylinder 1B in a plate feeding position located substantially directly above
Is inserted toward the expanded clamper 5b.

When the leading end of the master 33a having been made is clamped by the clamper 5a at a predetermined timing,
While the plate cylinder 1A rotates in the direction of the arrow (clockwise) in the figure, the master 33a, which has been made, is gradually wound around the outer peripheral surface 1Aa. After the completion of the master making, the rear end of the master 33a is cut into a predetermined length by the operation of a cutting means including a movable blade and a fixed blade (not shown) provided in the master making device 41a after the completion of the master making. When the master 33a is completely wound around the outer peripheral surface 1Aa of the plate cylinder 1A, the so-called plate feeding process ends.

Each of the masters 33a, 33b for which one plate has been made
Are wound around the outer peripheral surfaces 1Aa and 1Ba of the plate cylinders 1A and 1B, respectively, and the plate making and plate feeding steps are completed, and the plate setting step and the printing step are started. First, the paper feed tray 21 is raised until the uppermost sheet 22 stacked on the paper feed tray 21 contacts the call roller 23. Call roller 2
3 is in contact with the call roller 2
3 and the separation roller pair 2
4 and 25 and the separation plate 26 are separated into one by a cooperative action, and a pair of upper and lower guide plates 28 and 27
Are fed in the transport direction X toward the registration roller pairs 29 and 30 while being guided. At this time, the conveyed paper 22
Is in contact with the portion just before the nip portion of the pair of registration rollers 29, 30 and stops while being bent along the upper guide plate 28.

The plate cylinder 1A located on the upstream side in the transport direction X
Starts rotating in the direction of the arrow at the rotational speed at the time of printing when the printing operation starts. On the inner peripheral side of the plate cylinder 1A, magenta 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 the roller 3a and the doctor roller 4a rotate, they are kneaded and elongated, and adhere uniformly to the outer peripheral surface of the ink roller 3a. The remaining amount of ink is detected by an ink detecting means (not shown), and when the amount of ink is low, the ink is supplied from the ink supply distributor. In this manner, ink is supplied to the inner peripheral side of the plate cylinder 1A by the ink roller 3a which is in contact with the inner peripheral surface 1Ab 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. Is done.

The printing pressure device 32a includes an ink roller 3a, a press roller 9a, a press roller bracket 11a swingably supported by a shaft 10a, a press roller tension 1
3a and a press roller cam 12a. The press roller 9a has a function as a pressing unit that presses the fed sheet 22 against the plate cylinder 1A to form a print image on the sheet 22. The press roller 9a is
It is rotatably supported at one swing end of the press roller bracket 11a, and is provided to be able to freely contact and separate from the outer peripheral surface 1Aa of the plate cylinder 1A. The printing pressure of the press roller 9a on the plate cylinder 1A is adjusted by a press roller tension 13 stretched on the other swing end side of the press roller bracket 11a.
a (tensile spring), and the other swinging end of the press roller bracket 11a is pressed against the contour peripheral surface of the fan-shaped press roller cam 12a by the urging force of the press roller tension 13a. The press roller cam 12a is driven by the plate cylinder driving motor
When the sheet 22 is not fed from the sheet feeding device 20, the large-diameter portion is pressed by a press roller. The bracket 11a faces the other swing end. The press roller cam 12a rotates when the paper 22 is fed from the paper feeding device 20, and causes its small diameter portion to face the other swing end of the press roller bracket 11a, and rotates the press roller 9a clockwise in the figure. It swings in the direction.

The sheet 22 is formed by a pair of registration rollers 29, 30.
When the sheet is fed between the printing drum 32A and the press roller 9a in the printing pressure device 32a at a predetermined timing synchronized with the rotation of the printing drum 1A, the printing paper 32A is separated from the outer peripheral surface of the printing drum 1A downward in synchronization with this. As the press roller 9a is swung and raised, the press roller 9a is pressed against the master 33a, which has been wound around the outer peripheral surface 1Aa of the plate cylinder 1A. As a result, the master 33a that has finished making the plate 33A is pressed by the adhesion force due to the viscosity of the ink oozing out from the opening of the plate cylinder 1A.
At the same time, the ink oozes out from the perforated pattern portion of the master 33a, which has been made, and the oozed ink is transferred to the surface of the paper 22, and the desired image of the first color is printed on the paper 22. Formed.

When the leading end 22a of the paper 22 on which the image of the first color is printed reaches a position near the leading end of the separation claw 7a, the separation claw 7a is rotated about the separation claw shaft 8a in synchronization with the rotation of the plate cylinder 1A. It rotates and approaches the outer peripheral surface 1Aa of the plate cylinder 1A. Separation / separation of the sheet 22 from the plate cylinder 1A is mainly performed by the intermediate blowing unit 45, the separation claw 7a, and the suction conveyance device 17a. This separation / separation operation will be described later. Separation
The peeled sheet 22 is further transported downstream in the transport direction X by the suction transport device 17a.

The suction transfer device 17a is driven by the driven roller 14a.
And a driving roller 15a driven in a counterclockwise direction by a conveying motor 60.
6a and a suction fan 18a.
The suction conveyance device 17a is under the control of the control means 34 shown in FIG. 2, and the control means 34 controls the conveyance speed of the paper 22 by the conveyance belt 16a to be constant. The separated and peeled printed paper 22 is supplied to the suction fan 18a.
The upper surface 16 of the transport belt 16a which becomes the transport surface by the operation of
The conveyance belt 16a is conveyed toward the next printing position E2 by the rotation of the conveyance belt 16a in the counterclockwise direction.

The printing operation of the plate cylinder 1B, which is located on the downstream side in the transport direction X and corresponds to the second color, starts in synchronization with the plate cylinder 1A, and is performed at the rotational speed during printing in the direction of the arrow (clockwise) in the figure. Start to be rotated. On the inner peripheral side of the plate cylinder 1B, black ink is supplied to an ink reservoir Ib formed between the ink roller 3b and the doctor roller 4b. The black ink is kneaded and extended by the rotation of the ink roller 3b and the doctor roller 4b, and is uniformly attached to the outer peripheral surface of the ink roller 3b, and the second color ink is supplied to the inner peripheral side of the plate cylinder 1B. You.

The sheet 22 is transferred to the printing pressure device 32b at a predetermined timing by the transfer belt 16a of the suction transfer device 17a.
Is fed to the printing position E2 between the plate cylinder 1B and the press roller 9b, the press roller 9b separated below the outer peripheral surface of the plate cylinder 1B swings and rises in synchronization with this. As a result, the master 33b is pressed against the master 33b, which has been wound around the outer peripheral surface 1Ba of the plate cylinder 1B. As a result, the master 33b that has finished making the plate 33 is pressed by the adhesion force due to the viscosity of the ink oozing out from the opening of the plate cylinder 1B.
At the same time, the ink oozes out from the perforated pattern portion of the master 33b which has been made, and the oozed ink is transferred to the surface of the paper 22 so that the image of the second color ink is already 1st. The image is printed on the paper 22 on which the image of the color ink is formed.

When the leading end 22a of the sheet 22 on which the image of the second color is formed reaches a position near the leading end of the separation claw 7b,
The separation claw 7b rotates around the separation claw shaft 8b in synchronization with the rotation of the plate cylinder 1B to approach the outer peripheral surface 1Ba of the plate cylinder 1B, and at the same time, generates compressed air generated by an air pressure generator (not shown). The flow is blown out from the tip of the separation claw 7b, and the tip 22a of the sheet 22 is separated and separated from the plate cylinder 1B.
Printed paper 22 separated and separated by separation claw 7b
Is further conveyed by the paper discharge device 35 to the paper discharge tray 37 located on the downstream side in the transport direction X.

The paper discharging device 35 includes a porous transport belt 40 stretched between a driven roller 39 and a driving roller 38.
And a suction fan 36. The transport belt 40 of the sheet discharging device 35 is driven in synchronization with the plate cylinder 1B at a transport speed substantially equal to the rotation speed of the plate cylinder 1B. The printed paper 22 separated and separated by the separation claw 7b is adsorbed on the transport belt 40 while being sucked by the operation of the suction fan 36, and is rotated by the counterclockwise rotation of the transport belt 40, so that the discharge tray is discharged. 37 are sequentially discharged and loaded. In this way, so-called "printing",
Alternatively, the “test printing” ends.

The numeric keypad 71 on the operation panel 70 shown in FIG.
When the print start key 72 is pressed by setting the number of prints, the steps of paper feed, printing, and paper discharge are repeated by the set number of prints in the same steps as the trial printing, and all the steps of stencil printing are performed. finish.

The configuration and the arrangement of the above-mentioned respective devices constituting the stencil printing apparatus are merely examples, and may be constituted by other known devices and various arrangements. Needless to say.
The double-cylinder stencil printing apparatus is not limited to the stencil printing apparatus integrated with heat-sensitive digital stencil as described above. For example, each stencil cylinder 1A, 1B forms a drum unit and is detachable from the apparatus body. In this case, the master plate is supplied by a plate-making and feeding device or a plate-discharging device (both not shown) provided separately from the apparatus main body, or the used master is transferred to each plate cylinder. 1A, 1B may be peeled from the outer peripheral surfaces 1Aa, 1Ba and discharged.
Each plate making device 41a, 41b and each plate discharging device 42a, 4
2b may not necessarily be provided in the apparatus 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. As a multicolor stencil printing apparatus, press rollers 9a, 9b
Although the printing pressure is applied to the plate cylinders 1A and 1B by this, an impression cylinder known in a printing press may be used instead of the press roller.

The intermediate blower 45, which is a main part of this embodiment, will be described. The intermediate blower 45 includes a blower fan 46 serving as a blower source, and a sheet transport path 47 formed between the plate cylinder 1A and the plate cylinder 1B for blowing air generated by the blower fan 46.
And a wind guide member 48 that forms a plurality of flow paths for guiding the air. The paper transport path 47 includes printing positions E1, E
The transport surface is mainly configured by a transport belt 16a disposed between the transport belt 16a and the transport belt 16a. The blower fan 46 is a blower motor 4
The rotation drive at 9 generates a strong airflow toward the suction transport device 17a. As shown in FIG. 2, the blower motor 49 is electrically connected to the control unit 34 via the drive circuit 50. When the print start key 72 is pressed and a print signal is input to the control unit 34, It operates as a start signal.

As shown in FIG. 4, the baffle member 48 is formed by integrally forming the outside 51, 52 of the baffle plate and the insides 53, 54 of the baffle plate. It is provided fixed to the base of a device (not shown). Outside the air guide plate 51,5
2 and the inside of the air guide plate 53, 54 are formed to have a width somewhat longer than the length of the plate cylinders 1A, 1B in the generatrix direction. The outer surfaces 51 and 52 of the air guide plates are respectively provided on the outer peripheral surfaces 1 of the plate cylinders 1A and 1B.
Aa, 1Ba is formed to be curved along the first cylinder.
At the time of rotation of A and 1B, it is installed at a position that does not come into contact with clampers 5a and 5b. Upper end 51 of outside 51, 52 of wind guide plate
a and 52a are a case 46a for accommodating the blower fan 46;
The blower fan 46 extends in the main flow path 55 formed by the outside of the air guide plate 51, 52.

The inside of the air guide plates 53 and 54 are respectively
A and 1B are formed so as to be curved along the outer peripheral surfaces 1Aa and 1Ba, and are arranged below the outside of the air guide plates 51 and 52 in a C-shape so as to widen toward the paper transport path 47. The upper ends 53a, 54a of the air guide plates 53, 54 are:
It is arranged inside the outlet 56 of the main flow path 55 formed between the lower ends 51 b and 52 b of the outside air guide plates 51 and 52. As a result, the main flow path 55 is divided in the vicinity of the outlet 56, and the three branch flow paths 57, 5 are provided between the plate cylinders 1A, 1B.
8, 59 are formed. The lower end 53b of the inside of the air guide plate 53 is
It extends to the vicinity of the separation claw 7a.

The branch flow path 57 is provided on the outer peripheral surface 1Aa of the plate cylinder 1A.
Is formed between the driven roller 14a and the plate cylinder 1A at the upstream end 47a of the sheet transport path 47 between the driven roller 14a and the plate cylinder 1A.
The branch flow path 59 is provided between the outer peripheral surface 1Ba of the plate cylinder 1B and the air guide plate 5.
The outlet 59a is formed at the downstream end 47b of the sheet transport path 47 located between the drive roller 15a and the plate cylinder 1B. Branch channel 58
Are formed between the insides 53 and 54 of the air guide plate, and the outlet 58a is disposed on the upper surface 16b of the transport belt 16a which is the transport surface of the paper transport path 47. Further, between the drive roller 15a and the printing position E2, an entry guide plate 64 serving as an entry guide means is provided so as not to contact the press roller 9b.
Are provided so as to linearly connect the upper surface of the transport belt 16a and the printing position E2.

On the operation panel 70, as shown in FIG.
A numeric keypad 71 for setting the number of prints, a print start key 72 for outputting a print start signal for setting activation of each operation leading to a printing process, and a keypad for plate making, plate feeding, and test printing from image reading of a document. A plate making start key 73 for activating each operation up to the plate making, a stop key 74 for stopping each operation up to the printing process and the like,
A display device 75 composed of LEDs for displaying the number of prints and the like set by the numeric keypad 71, and a monitor display device for displaying a failure location such as a jam of the masters 33a and 33b and paper 22 in the stencil printing device and details of the failure. 76
A clear key 77 for canceling the number of prints and the like set by the ten keys 71; an adjustment key 78 including a down key 78a and an up key 78b; an air volume selection key 44 serving as air volume setting means; A paper type selection key 43 serving as paper identification means for identifying the type and a paper size selection key 79 serving as paper size setting means for setting the size of the paper 22 are arranged. The paper type selection key 43 and the paper size selection key 79 respectively constitute paper information input means. Note that the paper type selection key 4
3. The air volume selection key 44, the adjustment key 78, and the paper size selection key 79 are not used in this embodiment.

The control means 34, as shown in FIG.
U (central processing unit) 80, I / O (input / output) port and ROM (read only memory) 81 not shown,
It comprises a known microcomputer having a RAM (readable / writable storage device) 82 and the like, which are connected by a signal bus (not shown). Control means 34
Are electrically connected to various keys of the operation panel 70 and the display device 75, and a command signal and / or
Alternatively, an on / off signal and a data signal are transmitted and received.

The CPU 80 includes plate making devices 41a and 41b.
And a stencil feeding system driving unit 8 for driving a stencil feeding unit (not shown)
3. Plate discharging system drive unit 8 that drives plate discharging devices 42a and 42b
4, a paper feed system drive unit 85 for driving the paper feed device 20, a printing pressure system drive unit 86 for driving the print pressure devices 32a and 32b, and a paper discharge system drive for driving the paper discharge device 35 and an air pressure generating device (not shown). The unit 87 and a fan driving unit 88 for driving the suction fan 18a are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between the units, and the stencil printing apparatus. The system controls the entire operation such as starting, stopping, and timing of the devices and drive mechanisms of each unit.

A transport motor 60 for rotating the drive roller 15a and a plate cylinder drive motor 61 for rotating the plate cylinder 1A are electrically connected to the CPU 80 via drive circuits 62 and 63, respectively. In the control means 34, input information from sensors (not shown) and a calculation result in
The information is temporarily stored in the AM 82 or the information is read out at an appropriate time.

The ROM 81 stores in advance programs and necessary data relating to operations such as starting, stopping, and timing of the stencil printing apparatus and each drive unit. In particular, in this embodiment, when the print start signal is input, the blower motor 49,
Data for driving the transport motor 60 and the fan drive unit 88 and stopping the drive when the set number of prints is completed is stored.

The separation / separation operation of the sheet 22 in the stencil printing apparatus having such a configuration will be described. When the print start key 72 is pressed and a print start signal is input to the control means 34, the blower motor 49, the transfer motor 60, and the fan drive unit 88 are driven respectively, and the blower fan 46 rotates to rotate the entire sheet transfer path 47. , The air flow is started, the conveyor belt 16a rotates counterclockwise, and the suction fan 18a rotates to rotate the upper surface 16 of the conveyor belt 16a.
A suction action is generated in b and its periphery. That is, while the air flow is blown to the paper transport path 47,
A suction force acts on the transporting surface of the paper transporting path 47 and the vicinity thereof.

When the leading end 22a of the paper 22 on which the first color image is printed at the printing position E1 reaches the upstream end 47a of the paper transport path 47, air is blown from the blowing fan 46 and blown out from the outlet 57a of the branch flow path 57. The flow
The top surface 22A of the plate cylinder 1A is sprayed from above onto the leading end 22a of the sheet 22 and the stiffness of the sheet 22 itself.
The leading end 22a of the sheet 22 attached to the sheet 22 is separated and separated before the separating claw 7a, and the winding of the sheet 22 is reduced. The leading end 22a of the separated sheet 22 is connected to the outlet 5
Conveyor belt 16a due to the air flow blown from 7a.
You will be guided toward. For this reason, the leading end 22 of the paper 22
a reaches the transport belt 16a near the driven roller 14a, the transport of the sheet 22 is not delayed, and the image double printing is reduced.

If the paper 22 has no stiffness or a large amount of ink adheres and the adhesion between the paper 22 and the plate cylinder 1A is large,
The period of attachment between the sheet 22 and the plate cylinder 1A becomes longer, and the leading end 22a of the sheet 22 is separated from the outer peripheral surface 1Aa of the plate cylinder 1A by the separation claw 7a, as shown by the broken line in FIG. Tip 2
When 2a is separated, the outlet 5
An air flow is blown from 7a, and the sheet 22 is guided by the air flow toward the transport belt 16a. Thereby, even if the sheet 22 moves in the transport direction X, the contact between the separation claw 7a and the upper surface (print image surface) of the sheet 22 is avoided, and the image is not rubbed by the separation claw 7a, and the printing state of the sheet 22 is improved. And can be transported.

The transport direction X
Is conveyed to the outlet 5 of the branch channel 58.
When it reaches the range of 8a, the airflow blown out from the outlet 58a is blown onto the upper surface of the sheet 22, and the sheet 22 is pressed against the transport belt 16a. Therefore, the flapping of the sheet 22 on the transport belt 16a is extremely reduced, and the suction force of the suction fan 18a is
2 and a sufficient conveying force can be obtained. Therefore, the conveyance delay of the paper 22 to the printing position E2 due to the insufficient conveyance force is reduced, and the image double printing is further reduced.

The conveyance of the sheet 22 further proceeds, and the leading end 22
When a reaches the downstream end 47b of the paper transport path 47, the air flow blown from the outlet 59a of the branch flow path 59 is blown from above the paper 22 and the drive roller 15
The sheet 22 near a is pressed against the transport belt 16a, and the leading end 22a of the sheet 22 that has passed over the drive roller 15a is pressed against the entry guide plate 64. For this reason, the flapping of the leading end 22a of the sheet 22 becomes extremely small, the position is stabilized, and the performance of entering the printing position E2 is improved. The leading end 22 of the sheet 22 reaching the downstream end 47b
In a, since the transport delay has been reduced by the blowing of the air flow from the branch flow paths 57 and 58, the printing position E is further increased.
2 can be reduced. As a result, image double printing can be further reduced.

In this embodiment, the branch flow paths 57, 58, 59
Is formed over the entire sheet transport path 47, but is not limited to this. When the transport of the paper 22 to the printing position E2 is delayed due to the winding of the paper 22 around the plate cylinder 1A, a flow path for blowing the airflow from the blowing fan 46 is formed only at the upstream end 47a, and the paper to the printing position E2 is formed. 22
If there is a problem in the inflow of the air, the flow path for blowing the air flow from the blower fan 46 is formed only in the downstream end 47b. It is only necessary to form a flow path for blowing the airflow from the blower fan 46. The main cause of the conveyance delay of the paper 22 with respect to the printing position E2 is that the paper 22
In many cases, a branch flow path 57 for blowing air flow is provided at least at the upstream end 47a. Preferably, the branch flow path 57 and the branch flow path 58 or
It is preferable to form two branch flow paths such as a branch flow path 57 and a branch flow path 59, and ideally, it is preferable to blow an air flow over the entire sheet transport path 47 as in this embodiment.
If the conveyance delay of the sheet 22 with respect to the printing position E2 is due to insufficient conveyance force due to the conveyance belt 16a or the intrusion of the sheet 22 into the printing position E2, the blowing fan 46 is provided to the branch passage 58 and the branch passage 59. What is necessary is just to send the airflow from.

Without providing the inside 53, 54 of the baffle plate, the lower ends 51b, 52b of the outside 51, 52 of the baffle plate are respectively connected to the separation claws 7a.
If the air flow is extended from the main flow path 55 to the entire sheet conveyance path 47 by extending the air flow to the vicinity of the conveyance belt 16a, the configuration of the air guide member 48 can be simplified and the workability is improved.

When the outlet 56 of the main flow path 55 is divided to form the branch flow paths 57, 58, 59 as in the present embodiment, the inlet of the air flow into each of the branch flow paths 57, 58, 59 is narrowed. Therefore, the flow rate of the air flow can be increased, and the blowing force against the paper 22 can be increased as compared with the case where the air flow is blown out only from the outlet 56 of the main flow path 55.

In this embodiment, the entry guide plate 64 is provided. However, when the distance between the drive roller 15a and the printing position E2 is short, the entry guide plate 64 is not necessarily provided. This is because the sheet 22 positioned before and after the drive roller 15a is pressed by the airflow from the branch flow path 59 and the suction fan 1
8a acts on the leading end 22 of the sheet 22.
This is because, even if a passes through the driving roller 15a, a stiffness is given to the front end 22a.

(Second Embodiment) This embodiment corresponds to FIGS.
As shown in (1), the position of the outlet 57a of the branch flow path 57 in the first embodiment is set to the optimum airflow angle. The outlet 57a is provided with the separating claw 7a.
A tangent line 66 at a point P where the line 65 connecting the tip 7b of the plate cylinder 1A and the rotation center of the plate cylinder 1A intersects with the outer peripheral surface 1Aa of the plate cylinder 1A.
The airflow from the blower fan 46 can be blown in a tangential direction of the airflow.

The outside 51 of the baffle plate and the inside 53 of the baffle plate, and the outside baffle plate 52 and the inside of the baffle plate 54 are based on a center line O which bisects the space between the plate cylinders 1A and 1B in the left-right direction. It is arranged at the position of the line object.

With such a configuration, the airflow blown from the blower fan 46 through the branch flow path 57 is
Since the air is blown between the leading end 7b of the plate cylinder 1A and the outer peripheral surface 1Aa of the plate cylinder 1A, the airflow is blown toward the leading end 22a of the sheet 22 along the outer peripheral surface 1Aa of the plate cylinder 1A. In other words, the blowing range of the airflow to the leading end 22a of the sheet 22 is narrowed as compared with the case of the first embodiment. By blowing the airflow in a pinpoint manner therebetween, the separation between the leading end 22a and the outer peripheral surface 1Aa and the releasability of the paper 22 from the outer peripheral surface 1Aa are improved. As a result, the curling of the sheet 22 is further reduced, and the conveyance delay of the sheet 22 with respect to the print position E2 is reduced, so that image double printing can be further reduced.

(Third Embodiment) The third embodiment is characterized in that the air flow generated by the blower fan 46 in the first and second embodiments is controlled so as to be changed according to the type of the paper 22. I have. Specifically, the rotation of the blower motor 49 of the blower fan 46 is controlled using the control means 90 shown in FIG.

The control means 90 includes a CPU (Central Processing Unit) 91, an I / O (input / output) port (not shown) and an RO
An M (read only storage device) 92, a RAM (readable and writable storage device) 93, and the like are provided. The control panel 90 includes the operation panel 7
0 various keys and display device 75, paper type selection key 43
Are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between them. The paper type selection key 43 includes a key switch 43a for selecting thick paper, a key switch 43b for selecting standard thickness paper, and a key switch 43c for selecting thin paper. ing.

The CPU 91 includes plate making devices 41a and 41b.
And a stencil feeding system driving unit 8 for driving a stencil feeding unit (not shown)
3. Plate discharging system drive unit 8 that drives plate discharging devices 42a and 42b
4, a paper feed system drive unit 85 for driving the paper feed device 20, a printing pressure system drive unit 86 for driving the print pressure devices 32a and 32b, and a paper discharge system drive for driving the paper discharge device 35 and an air pressure generating device (not shown). The unit 87 and a fan driving unit 88 for driving the suction fan 18a are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between the units, and the stencil printing apparatus. The system controls the entire operation such as starting, stopping, and timing of the devices and drive mechanisms of each unit. The blower motor 49 is electrically connected to the CPU 91 via a voltage varying device 94.

The transport motor 60 for rotating the drive roller 15a and the plate cylinder drive motor 61 for rotating the plate cylinder 1A are connected to the CPU 91 via drive circuits 62 and 63, respectively. The control means 90 stores the input information from each sensor (not shown) and the calculation result of the CPU 91 in the RAM 9.
3, and the information is read out at appropriate times.

The ROM 92 stores in advance programs and necessary data relating to operations such as starting, stopping, and timing of the stencil printing apparatus and each drive unit. In particular, in this embodiment, when the print start signal is input, the blower motor 49,
The transport motor 60 and the fan drive unit 88 are driven, and when the set number of prints is completed, the voltage variable device 94 is electrically operated in accordance with data for stopping the drive or information input from the paper type selection key 43. Then, voltage control data for switching the voltage to the blower motor 49 is stored.

When the signal from the key switch 43a is input to the CPU 91, the voltage control data
The voltage variable device 94 is controlled so that the voltage supplied to the fan 91 becomes lower than the reference voltage. When a signal from the key switch 43c is input to the CPU 91, the voltage supplied to the blower motor 49 becomes higher than the reference voltage. Voltage variable device 94
And the signal from the key switch 43b is
, The voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes the reference voltage.

According to the stencil printing apparatus having the control means 90 having such a configuration, when the paper 22 stacked on the paper feed tray 21 is thick, the key switch 43a is pressed.
Then, the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes lower than the reference voltage.
The rotation of the blower fan 46 per unit time decreases, and the amount of air per unit time generated by this fan decreases. Therefore, the flow rate of the air blown to the sheet 22 via the branch channels 57, 58, and 59 shown in FIGS. 4 and 6 is reduced.

When the paper 22 loaded on the paper feed tray 21 is thin, pressing the key switch 43c controls the voltage variable device 94 so that the voltage supplied to the blower motor 49 becomes higher than the reference voltage. The rotation per unit time of the blower fan 46 increases, and the amount of air generated per unit time by the fan increases. For this reason, the flow rate of the air blown to the sheet 22 via the branch flow paths 57, 58, and 59 shown in FIGS. 4 and 6 increases.

When the paper 22 is thick, the paper 22 has a stiffness and has good separation and peeling properties from the plate cylinder 1A, and
Since there is no problem even if the rotation of the blower 9 is suppressed, by suppressing the rotation of the blower motor 49, the heating of the blower motor 49 can be reduced, and the durability of the motor can be increased and the energy saving of the apparatus can be achieved. When the paper 22 is thin, the paper 22 has no stiffness,
In such a case, the rotation of the blower motor 49 is increased to increase the flow rate of the air blown to the leading end 22a of the sheet 22, thereby improving the separation / separation properties. In addition, it is possible to enhance the approachability to the printing position E2. Thus, the paper type selection key 4
3 to control the blower motor 49 to control the paper 22
When the blowing amount of the airflow with respect to is automatically adjusted, it is possible to reduce the image double printing while shortening the adjustment time.

(Fourth Embodiment) In a fourth embodiment, as shown in FIG. 8, a blower fan 46 rotated by a blower motor 49 between the plate cylinders 1A and 1B, and the blower fan 46 generates the blower fan. Intermediate air blowing means 99 having movable wind guide plates outside 95, 96 and movable wind guide plates 97, 98 as wind guide members for forming a plurality of flow paths for guiding the air flow to the paper transport path 47 are provided. The outside of the movable wind guide plate 95 and 96 and the inside of the movable wind guide plate 97 and 98 are moved according to the type of the paper 22 to vary the flow path area and automatically adjust the air flow rate blown to the paper 22.

The outside 95, 96 of the movable baffle plate and the inside 9 of the movable baffle plate
7 and 98 are formed to have widths slightly longer than the lengths (widths) of the plate cylinders 1A and 1BA in the generatrix direction, respectively. The outside 95 of the movable wind guide plate and the inside 97 of the movable wind guide plate include a line 65 connecting the tip 7b of the separation claw 7a and the rotation center of the plate cylinder 1A, and the plate cylinder 1
A can be translated by a variable mechanism 100 shown in FIG. 9 in a direction orthogonal to a direction of a tangent line 66 at a point P where the outer peripheral surface 1A intersects with the outer peripheral surface 1Aa. The outside 95 of the movable air guide plate and the inside 97 of the movable air guide plate, and the outside 96 of the movable air guide plate and the inside 98 of the movable air guide plate are based on a center line O that bisects the space between the plate cylinders 1A and 1B in the left-right direction. Is arranged at the position of the line object.

The movable air guide plates 95 and 96 are curved so as to extend along the outer peripheral surfaces 1Aa and 1Ba of the plate cylinders 1A and 1B, respectively.
a, 5b. As shown in FIG. 9, the upper ends 95a and 96a of the movable wind guide plates 95 and 96 extend to reach the case 46a of the blower fan 46, and are formed between the movable wind guide plates 95 and 96. The blower fan 46 is located at the center in the main flow path 105. Pins 101 and 102 extending in the generatrix direction of the plate cylinder 1A are rotatably provided at upper ends 95a and 96a of the movable wind guide plates 95 and 96, respectively. These pins 101, 102
Are loosely fitted in arc-shaped guide holes 103 and 104 provided in side plates of a device (not shown), respectively, to prevent the upper ends 95a and 96a from swinging freely when the movable wind guide plates 95 and 96 move. The amount of movement of the movable wind guide plates 95, 96 toward the outer circumferential surfaces 1Aa, 1Ba of the plate cylinders 1A, 1B is limited so as not to contact the clampers 5a, 5b. The lower ends 95b and 96b of the outer movable wind guide plates 95 and 96 are respectively pin-connected to racks 106 and 107 which constitute one configuration of the variable mechanism 100.

The movable wind guide plates 97 and 98 are provided with the plate cylinders 1A and 1A.
B are formed along the outer peripheral surfaces 1Aa and 1Ba of the sheet conveying path 47 below the wind guide plates 95 and 96, respectively.
They are arranged in a C shape so as to widen toward. Upper ends 97a, 98a of movable wind guide plates 97, 98
Are racks 108, 10 which constitute one configuration of the variable mechanism 100.
9 are respectively pin-coupled to each other, and are arranged inside the outlet 110 of the main flow path 105. Outlet 110
Is divided into three by the movable air guide plates 97 and 98, and the plate cylinder 1
A, 1B, three branch flow paths 111, 112, 113
Is configured. The lower end 97b of the movable air guide plate 97 is
As shown in FIG. 8, it extends to the vicinity of the separation claw 7a.
The lower end 98b of the movable air guide plate 98 extends to the vicinity of the downstream end 47b of the paper transport path 47.

The branch flow path 111 is provided on the outer peripheral surface 1A of the plate cylinder 1A.
a between the driven roller 14a and the plate cylinder 1A at the upstream end 47a of the sheet conveying path 47 formed between the driven roller 14a and the plate cylinder 1A.
Has been placed. The branch channel 113 is formed between the outer peripheral surface 1Ba of the plate cylinder 1B and the outer surface of the movable wind guide plate 98, and the outlet 113a is located between the drive roller 15a and the plate cylinder 1B. Downstream end 47 of paper transport path 47
b. The branch channel 112 is located within the movable air guide plate 9.
7 and 98, and the outlet 112a is disposed on a transport belt 16a which is a transport section of the paper transport path 47.

The variable mechanism 100 comprises a pair of racks 106 and 108 for movably connecting the outside 95 of the movable wind guide plate and the inside 97 of the movable wind guide plate, a small gear 114 meshing with the racks, , A pair of racks 107 and 109 for movably connecting the movable wind guide plate 97 and a small gear 115 meshing with the racks 107 and 109, a wind guide plate drive motor 116 serving as a driving source, and a wind guide plate drive motor 116 Is mainly composed of a power transmission mechanism 117 for transmitting the output of the movable wind guide plate 97, 98 to the inside. Racks 106, 108 and Rack 1
07 and 109 are opposed to each other in parallel with the small gears 114 and 115 interposed therebetween, respectively.
09 moves, the racks 106 and 1 move in the opposite direction.
07 are moved. The baffle plate driving motor 116 is a stepping motor that can rotate bidirectionally, and an output gear 128 is fixed to an output shaft 116a.

As shown in FIGS. 9 and 11, the power transmission mechanism 117 includes a movable belt 120 wound around pulleys 118 and 119 and a movable belt 123 wound around pulleys 121 and 122, respectively. 97, 9 in the breeze
8 is fixed via holders 124 and 125. The pulleys 119 and 122 are provided with an electromagnetic clutch 119.
a and 122a, respectively, and rotating shafts 126 and 127
When the electromagnetic clutches 119a and 122a are turned on, they rotate integrally with the rotating shafts 126 and 127. Drive gears 130 and 131 connected to an output gear 128 via a connection gear 129 are fixed to the rotating shafts 126 and 127. Moving belt 120
Are provided in parallel with the racks 106 and 108, and the moving belt 123 is provided in parallel with the racks 107 and 109. The holders 124 and 125 are provided for the moving belt 1.
At 20, 123, they are fixed to a belt surface that moves in the same direction.

When the wind guide plate moving belts 120 and 123 move clockwise, the movable wind guide plates 97 and 98 move together with the racks 108 and 109 in a direction to narrow the branch flow path 112, and the movable belts 120 and 123 move. Move in the counterclockwise direction, the rack 10
Moves with 8,109.

The inside of the movable air guide plate 97 and 98 is connected to the branch channel 112.
Move the racks 106 and 107 in the direction opposite to the racks 108 and 109, and move the outside of the movable wind guide plate 9.
5, 96 are the outer peripheral surfaces 1Aa, 1 of the plate cylinders 1A, 1B, respectively.
It moves in the direction approaching Ba, and 97, 98 in the movable air guide plate.
Moves in the direction in which the branch channel 112 is expanded, the rack 1
06 and 107 are moved in the opposite direction to the racks 108 and 109 to move the outsides of the movable air guide plates 95 and 96 away from the outer peripheral surfaces 1Aa and 1Ba of the plate cylinders 1A and 1B, respectively.

That is, when the moving belts 120 and 123 are moved in the counterclockwise direction, the main flow path 105 and the branch flow paths 111 and 113 shown in FIG. 95, 96 outside the baffle plate,
As shown in FIG. 10, the width of the main flow path 105 is reduced by moving as shown in FIG. 10, and the inlet of the branch flow path 111 constituted by the lower end 95 b of the inside of the movable baffle plate 95 and the upper end 97 a of the inside of the movable baffle plate 97. 111b, a lower end 96b of the movable air guide plate 96, and an upper end 98a of the movable air guide plate 98.
The third inlet 113b is narrowed.

When the moving belts 120 and 123 are moved clockwise, the main flow path 105 and the branch flow path 1 shown in FIG.
97, 9 inside the movable baffle plate in which 11, 11 are narrowed
8 and the movable wind guide plates 95 and 96 move as shown in FIG. 9 to expand the main flow path 105, and the inflow port 111b and the inflow port 113b are also expanded, respectively.

The electromagnetic clutches 119a and 122a and the baffle plate driving motor 116 are under the control of the control means 132 shown in FIG. The control means 132 includes a CPU (Central Processing Unit) 133, an I / O (not shown)
Port and ROM (Read Only Memory) 134, R
It comprises a well-known microcomputer having an AM (Read / Write Storage) 135 and the like, which are connected by a signal bus (not shown). Control means 13
2, a ten key 71, a print start key 72, a plate making start key 73, various operation keys 74 and 77, display devices 75 and 76, and a paper type selection key 43 of the operation panel 70 shown in FIG. Command signals and / or on / off signals and data signals are transmitted and received between them. The paper type selection key 43 includes a key switch 43a, a key switch 43b, and a key switch 43c as in the third embodiment.

The CPU 133 includes plate making devices 41a, 41
b and a plate making system driving unit 8 for driving a plate forming unit (not shown)
3. Plate discharging system drive unit 8 that drives plate discharging devices 42a and 42b
4, a paper feed system drive unit 85 for driving the paper feed device 20, a printing pressure system drive unit 86 for driving the print pressure devices 32a and 32b, and a paper discharge system drive for driving the paper discharge device 35 and an air pressure generating device (not shown). The unit 87 and a fan driving unit 88 for driving the suction fan 18a are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between the units, and the stencil printing apparatus. The system controls the entire operation such as starting, stopping, and timing of the devices and drive mechanisms of each unit.

The baffle plate drive motor 116 is
6 and is electrically connected to the CPU 133. Conveying motor 60 for rotating drive roller 15a and plate cylinder 1A
Drum driving motor 61 and the blower motor 49 for driving the rotation of
133. The control unit 132 stores the input information from each sensor and the calculation result of the CPU 133 in a RAM.
The information is temporarily stored in the memory 135 or the information is read out at an appropriate time.

The ROM 134 stores in advance programs and necessary data relating to operations such as starting, stopping, and timing of the stencil printing apparatus and each drive unit. Particularly, in this embodiment, when a print start signal is input from the print start key 72, the blower motor 49, the transport motor 60, and the fan drive unit 88 are driven, and when the set number of prints is completed, these drives are stopped. The air guide plate drive motor 116
Of the electromagnetic clutch 119a, 1
Data for ON / OFF control of 22a is stored.

The baffle plate drive motor 116 and the electromagnetic clutch 1
The control data of 19a and 122a is stored in the key switch 43a.
Is input to the CPU 133, the electromagnetic clutches 119a and 122a are turned on and the wind guide plate drive motor 11 is turned on.
6 can be transmitted to the moving belts 120 and 123, and the main flow path 105 and the inlets 111b and 113
b and 97, 98 in the movable air guide plate in the direction of becoming narrower, respectively.
Is controlled so as to move the motor.

The signal from the key switch 43c is supplied to the CPU 1
33, the electromagnetic clutches 119a, 122a
Is turned on so that the driving force from the baffle plate driving motor 116 can be transmitted to the moving belts 120 and 123, and the main flow path 105 and the inflow ports 111b and 113b can be widened in the movable baffle plates 97 and 97, respectively. The rotation direction of the baffle plate drive motor 116 is controlled to move the motor 98.

In this embodiment, when the output shaft 116a of the baffle plate driving motor 116 is driven to rotate clockwise, the moving belts 120 and 123 rotate clockwise, respectively, and the output shaft 116a moves counterclockwise. , The moving belts 120 and 123 rotate in the counterclockwise direction, respectively.

According to the stencil printing apparatus having such a configuration,
When the paper 22 stacked on the paper feed tray 21 shown in FIG. 8 is thick, the key switch 43a is pressed. Then, the output shaft 116a of the baffle plate driving motor 116 is rotated in the counterclockwise direction, and the moving belts 120 and 123 are respectively rotated in the counterclockwise direction, so that the main flow path 105 and the inlets 111b and 113b are Becomes narrower as shown in FIG. Thereby, the area of the main flow path 105 and the inlet 1
11b, 113b and the area of the branch flow paths 111, 113 are reduced, and the branch flow path 1
The air flow per unit time introduced into 11, 113 is reduced.

Therefore, the upstream end 47 of the paper transport path 47
a and the flow rate of air blown to the downstream end 47b decreases, and the paper 2
The airflow blown to 2 will be reduced. When the inlets 111b and 113b become narrower, the branch flow path 1
12, the main flow path 105 is narrowed, so that the flow rate of air flowing through the branch flow path 112 is relatively reduced and is blown onto the entire conveyor belt 16a.

When the paper 22 stacked on the paper feed tray 21 is thin, the key switch 43c is pressed. Then
The output shaft 116a of the wind guide plate drive motor 116 is driven to rotate clockwise, and the moving belts 120 and 123 rotate clockwise, respectively, so that the main flow path 105 and the inlets 111b and 113b are shown in FIG. Widen as shown. Thus, the area of the main flow path 105 and the inlet 111
b, 113b and the area of the branch flow paths 111, 113 increase, and the branch flow path 11
The air flow rate per unit time introduced into 1,113 increases. Therefore, the flow rate of air blown to the upstream end 47a and the downstream end 47b of the paper transport path 47 increases,
The flow rate of the air blown to the paper 22 on 7 will be increased. When the inflow ports 111b and 113b are widened, the branch flow path 112 is narrowed, but the main flow path 105 is widened. Sprayed.

When the paper 22 is thick, the paper 22 is stiff and has good separation / separation from the plate cylinder 1A, and there is no problem even if the amount of air flow blown to the paper 22 is suppressed.
2 is thin, the paper 22 has no stiffness and is stuck to the plate cylinder 1A, so that the separation / peelability and the penetration of the plate cylinder 1B into the printing position E2 are not good. By widening the passage 105 and the branch passages 111 and 113 to increase the flow rate of air blown to the sheet 22, the separation / separation of the plate cylinder 1A and the sheet 22 and the performance of entering the printing position E2 can be improved. Thus, the paper type selection key 4
By controlling the flow path area of the air flow to the paper 22 by operating the operation 3, the amount of the air flow blown to the paper 22 is automatically adjusted. it can.

In this embodiment, the outside of the movable wind guide plate 95, 96 is configured to move in conjunction with the inside of the movable wind guide plate 97, 98. However, the racks 106, 107, 108, 109 and the gears 114, 115 are provided. By moving only the movable wind guide plates 97 and 98 by the moving belts 120 and 123 without providing the
It may be so arranged that only the sides 11, 112 and 113 are moved and the flow rate of the air blown to the paper 22 is adjusted. Alternatively, the electromagnetic clutch 119a, 122a
Of the movable wind guide plate 97 and the movable wind guide plate outside 95
Side, or only one side of the inside of the movable baffle plate 98 and the outside of the movable baffle plate 96 is moved, and even if the air flow rate blown to the paper 22 is automatically adjusted, the image is adjusted while reducing the adjustment time. Double printing can be reduced.

(Fifth Embodiment) In the fifth embodiment, the flow path area variable control performed in the fourth embodiment and the rotation control of the blower motor 49 for driving the blower fan 46 performed in the third embodiment are performed. , Air volume selection key 44 and adjustment key 7 serving as air volume setting means
8, the blower fans 46 are individually controlled. Specifically, the stencil printing apparatus is controlled using the control means 140 shown in FIG. Hereinafter, the configuration of the control unit 140 and the control operation by the control unit 140 will be described. However, the mechanical configuration of the stencil printing apparatus will be described with reference to the stencil printing apparatus illustrated in FIG. 8 as an example.

The control means 140 includes a CPU (Central Processing Unit) 141, an I / O (input / output) port and a ROM (read only storage) 142, a RAM (read / write storage) 143 and the like (not shown). These are composed of a well-known microcomputer having a configuration connected by a signal bus (not shown). The control means 140 includes various keys and a display device 75 of the operation panel 70 shown in FIG.
The paper type selection key 43, the air volume selection key 44, and the adjustment key 78 for changing the voltage to the blower motor 49 stepwise.
Are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between them.

The CPU 141 includes plate making devices 41a, 41
b and a plate making system driving unit 8 for driving a plate forming unit (not shown)
3. Plate discharging system drive unit 8 that drives plate discharging devices 42a and 42b
4, a paper feed system drive unit 85 for driving the paper feed device 20, a printing pressure system drive unit 86 for driving the print pressure devices 32a and 32b, and a paper discharge system drive for driving the paper discharge device 35 and an air pressure generating device (not shown). The unit 87 and a fan driving unit 88 for driving the suction fan 18a are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between the units, and the stencil printing apparatus. The system controls the entire operation such as starting, stopping, and timing of the devices and drive mechanisms of each unit.

The blower motor 49 is connected to the CPU 141 via the voltage variable device 94. The transport motor 60 for rotating the drive roller 15a and the plate cylinder drive motor 61 for rotating the plate cylinder 1A are provided with drive circuits 62 and 63, respectively.
Is connected to the CPU 141 via the. The CPU 141 is connected to the wind guide plate drive motor 116 via the drive circuit 136, and is also connected to the electromagnetic clutches 119a and 122a.

The control means 140 stores the input information from each sensor (not shown) and the result of calculation by the CPU
143 is temporarily stored, or the information is read out at appropriate times.

The ROM 142 stores in advance programs and necessary data relating to operations such as start, stop, and timing of the stencil printing apparatus and each drive unit. In particular, in this embodiment, when the print start signal is input, the blow motor 4
9. Drive the transport motor 60 and the fan drive unit 88, and when the set number of prints has been completed, turn on the voltage variable device 94 in accordance with the data for stopping the drive or the input information from the paper type selection key 43. To switch the rotation direction of the baffle plate drive motor 116, switch the voltage to the blower motor 49, and
Data for ON / OFF control of 9a and 122a is stored.

Here, when a signal from the key switch 43a is input to the CPU 141, the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes lower than the reference voltage, and the electromagnetic clutches 119a and 122 are controlled.
is turned on to transmit the driving force from the baffle plate driving motor 116 to the moving belts 120 and 123, and
The rotation direction of the baffle plate drive motor 116 is controlled so as to move the insides 97 and 98 of the movable baffle plates in a direction in which the air inlet 05 and the inflow ports 111b and 113b become narrower, respectively.

The signal from the key switch 43c is supplied to the CPU 1
When the voltage is input to 41, the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes higher than the reference voltage, and the electromagnetic clutches 119a and 122a are turned on to drive the motor from the wind guide plate drive motor 116. Moving belt 1
20 and 123, and the rotation direction of the wind guide plate drive motor 116 is controlled so as to move the inside 97 and 98 of the movable wind guide plate in a direction in which the main flow path 105 and the inflow ports 111b and 113b are widened. In addition, key switch 4
When the signal from 3b is input to the CPU 141, the voltage controller 94 is controlled so that the voltage supplied to the blower motor 49 becomes the reference voltage.

When the selection signal from the air volume selection key 44 is input to the CPU 141, the control means 140 receives the signal from the adjustment key 78 with priority and operates the voltage variable device 94 electrically based on this signal. The switching of the voltage to the blower motor 49 is performed stepwise.

According to the stencil printing apparatus having such a configuration,
When the paper 22 stacked on the paper feed tray 21 shown in FIG. 8 is thick, the key switch 43a is pressed. Then, the output shaft 116a of the baffle plate driving motor 116 is rotated in the counterclockwise direction, and the moving belts 120 and 123 are respectively rotated in the counterclockwise direction, so that the main flow path 105 and the inlets 111b and 113b are Becomes narrower as shown in FIG. Therefore, the area of the main flow path 105 and the inlet 11
The areas of 1b and 113b and branch flow paths 111 and 113 are reduced. Further, since the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 is lower than the reference voltage, the rotation of the blower fan 46 per unit time is reduced, and the per unit time generated by this fan is reduced. The air volume decreases.

Therefore, the flow rate of air per unit time introduced into the branch passages 111 and 113 from the inlets 111b and 113b is reduced, and the upstream end 47 of the paper transport path 47 is reduced.
a and the flow rate of air blown to the downstream end 47b decreases, and the paper 2
The airflow blown to 2 will be reduced. When the inlets 111b and 113b become narrower, the branch passage 112 becomes wider, but the main flow passage 105 becomes narrower and the blower fan 4
Since the amount of air per unit time generated in 6 is also reduced, the flow rate of air flowing through the branch channel 112 is relatively reduced and is blown onto the entire conveyor belt 16a.

When the sheets 22 stacked on the sheet feed tray 21 are thin, the key switch 43c is pressed. Then
Since the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes higher than the reference voltage, the rotation of the blower fan 46 per unit time increases, and the amount of air generated by the fan per unit time increases. More. In addition, the output shaft 116a of the baffle plate drive motor 116 is driven to rotate clockwise, and the moving belts 120 and 123 rotate clockwise, respectively.
1b and 113b are widened. Thereby, the main flow path 105
Inlets 111b, 113b and branch channel 1 together with the area of
The area of 11, 113 increases, and the inflow ports 111b, 1
The air flow per unit time introduced into the branch flow paths 111 and 113 from 13b increases.

For this reason, the upstream end 47 of the paper transport path 47
a and the flow rate of air blown to the downstream end 47b increases,
The flow rate of air blown to the sheet 22 located in the vicinity of A and 1B increases. In addition, the inlet 111b,
When the width 113b becomes wider, the branch flow path 112 becomes narrower, but the main flow path 105 becomes wider and the air flow per unit time generated by the blower fan 46 also increases, so that the air flow rate flowing through the branch flow path 112 relatively increases. As a result, a sufficient airflow is blown over the entire upper surface 16b of the transport belt 16a.

When the paper 22 is thick, the paper 22 has stiffness and has good separation and peeling properties from the plate cylinder 1A, and
Since there is no problem even if the rotation of the blower 9 is suppressed, by suppressing the rotation of the blower motor 49, the heating of the blower motor 49 can be reduced, and the durability of the motor can be increased and the energy saving of the apparatus can be achieved. When the paper 22 is thin, the paper 22 has no stiffness,
In such a case, the rotation of the blower motor 49 is increased, and the main flow path 10 is removed.
By increasing the flow rate of the air blown to the sheet 22 by widening the flow path 5 and the branch flow paths 111 and 113, the separation / peeling property and the penetration property can be improved.

As described above, the amount of air flow per unit time generated by the blower fan 46 according to the type of the paper 22,
By automatically variably controlling the area of the flow path for blowing the airflow toward the paper 22 by the control means 140, the paper 2
2, it is possible to finely adjust the blowing amount of the airflow to the sheet 2, and it is possible to improve the separation / separation property of the sheet 22 from the plate cylinder 1A and the penetration property to the printing position E2, as well as the transport performance of the sheet 22. As described above, when the paper type selection key 43 is operated to control the blowing motor 49 and the baffle plate driving motor 116 to automatically adjust the blowing amount of the airflow to the paper 22, the image double printing is performed while shortening the adjustment time. Can be reduced.

On the other hand, even if the type of the paper 22 is selected and each part is controlled, image double printing on the paper 22 may occur due to a failure or the like. In such a case, when the air volume selection key 44 is pressed, the manual mode is set in which the signal from the adjustment key 78 has priority over the control based on the type of the paper 22. When the up key 78b is pressed, the voltage from the voltage variable device 94 to the blower motor 49 increases stepwise based on this signal, and the blower fan 4
When the down flow key 78a is pressed, the voltage from the voltage variable device 94 to the blow motor 49 decreases stepwise based on the signal, and the blow fan 46 generates the air flow. The amount of air flow per unit time is reduced.

Therefore, even if a trouble occurs in the control system corresponding to the type of the paper 22, the adjustment key 78 can be operated while observing the state of the image printed on the paper 22.
The amount of air flow blown to the paper 22 is manually adjusted, and the paper 22 can be separated and separated from the plate cylinder 1A, and can enter the printing position E2, and the paper transport performance can be improved. Can be stably reduced.

(Sixth Embodiment) In a sixth embodiment, the intermediate blowing means 99 shown in FIG. 8 is controlled in accordance with input information from a paper size selection key 79 serving as a paper size setting means shown in FIG. , For adjusting the amount of air flow blown onto the paper 22. Specifically, the control unit 15 shown in FIG.
Using 0, the rotation control of the blower motor 49 and the variable control of the flow path area by the baffle plate drive motor 116 are performed. Hereinafter, the configuration of the control unit 150 and the control operation by the control unit 150 will be described, but the mechanical configuration of the stencil printing apparatus will be described with reference to the stencil printing apparatus shown in FIG. 8 as an example.

The control means 150 includes a CPU (central processing unit) 151, an I / O (input / output) port and a ROM (read only memory) 152, a RAM (read / write memory) 153, and the like (not shown). These are composed of a well-known microcomputer having a configuration connected by a signal bus (not shown). The control means 150 includes various keys and a display device 75 of the operation panel 70 shown in FIG.
A paper size selection key 79 for outputting a signal corresponding to the size of the paper 22 is electrically connected, and sends and receives a command signal and / or an on / off signal and a data signal to and from the key. The paper size selection key 79 is a key switch 79a for selecting a relatively small size paper 22 such as B6 or A5 size, and a key switch for selecting a standard size paper such as B5 or A4 size. 79b
And a key switch 79c for selecting relatively large paper such as B4 and A3.

The CPU 151 includes plate making devices 41a, 41
b and a plate making system driving unit 8 for driving a plate forming unit (not shown)
3. Plate discharging system drive unit 8 that drives plate discharging devices 42a and 42b
4, a paper feed system drive unit 85 for driving the paper feed device 20, a printing pressure system drive unit 86 for driving the print pressure devices 32a and 32b, and a paper discharge system drive for driving the paper discharge device 35 and an air pressure generating device (not shown). The unit 87 and a fan driving unit 88 for driving the suction fan 18a are electrically connected to each other, and transmit and receive a command signal and / or an on / off signal and a data signal between the units, and the stencil printing apparatus. The system controls the entire operation such as starting, stopping, and timing of the devices and drive mechanisms of each unit.

The blower motor 49 is connected to the CPU 151 via the voltage changing device 94. The transport motor 60 for rotating the drive roller 15a and the plate cylinder drive motor 61 for rotating the plate cylinder 1A are provided with drive circuits 62 and 63, respectively.
Is connected to the CPU 151 via the. The CPU 151 is connected to the wind guide plate drive motor 116 via the drive circuit 136, and is also connected to the electromagnetic clutches 119a and 122a.

The control means 150 stores the input information from each sensor (not shown) and the calculation result of the CPU 151 in the RAM.
153 is temporarily stored, or the information is read out at appropriate times.

The ROM 152 stores in advance programs and necessary data relating to operations such as starting, stopping, and timing of the stencil printing apparatus and the respective driving units. In particular, in this embodiment, when the print start signal is input, the blow motor 4
9. The transport motor 60 and the fan drive unit 88 are driven, and when the set number of prints is completed, the drive of the air guide plate drive motor 116 is stopped in accordance with the data for stopping these drives and the input information from the paper size selection key 79. When the rotation direction is switched, the voltage variable device 94 is electrically operated to operate the blower motor 4.
9 is stored, and data for ON / OFF control of the electromagnetic clutches 119a and 122a is stored.

Here, when a signal from the key switch 79a is input to the CPU 151, the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes lower than the reference voltage, and the electromagnetic clutches 119a, 122
is turned on to transmit the driving force from the baffle plate driving motor 116 to the moving belts 120 and 123, and
The rotation direction of the baffle plate drive motor 116 is controlled so as to move the insides 97 and 98 of the movable baffle plates in a direction in which the air inlet 05 and the inflow ports 111b and 113b become narrower, respectively.

The signal from the key switch 79c is
When the voltage is input to the motor 51, the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes higher than the reference voltage, and the electromagnetic clutches 119a and 122a are turned on to drive the motor from the wind guide plate drive motor 116. Moving belt 1
20 and 123, and the rotation direction of the wind guide plate drive motor 116 is controlled so as to move the inside 97 and 98 of the movable wind guide plate in a direction in which the main flow path 105 and the inflow ports 111b and 113b are widened. When a signal from the key switch 79b is input to the CPU 151, the blower motor 49
Voltage variable device 9 so that the voltage supplied to
4 is controlled.

According to the stencil printing apparatus provided with such a control means 150, when the paper 22 loaded on the paper feed tray 21 shown in FIG. Press 79a. Then
The output shaft 116a of the baffle plate drive motor 116 is driven to rotate in the counterclockwise direction, and the moving belts 120 and 123 are respectively rotated in the counterclockwise direction.
And the inlets 111b and 113b are narrowed as shown in FIG. Therefore, the area of the main passage 105 and the inlet 1
11b, 113b and the area of the branch flow paths 111, 113 are reduced. Further, since the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 is lower than the reference voltage, the rotation of the blower fan 46 per unit time is reduced, and the per unit time generated by this fan is reduced. The air volume decreases.

Therefore, the flow rate of air per unit time introduced into the branch passages 111 and 113 from the inlets 111 b and 113 b is reduced, and the upstream end 47 of the paper transport path 47 is reduced.
a and the flow rate of air blown to the downstream end 47b is reduced, and the flow of air blown to the small-sized paper 22 is reduced. At this time, if the inflow ports 111b and 113b become narrower, the branch passage 112 becomes wider, but the main flow passage 105 becomes narrower and the air volume per unit time generated by the blower fan 46 becomes smaller. The flow rate is relatively reduced and is sprayed on the entire conveyor belt 16a.

The paper 22 loaded on the paper feed tray 21 is B
In the case of a relatively large size such as 4, A3, etc., the key switch 79c is pressed. Then, since the voltage variable device 94 is controlled so that the voltage supplied to the blower motor 49 becomes higher than the reference voltage, the rotation of the blower fan 46 per unit time increases, and the per-unit time generated by this fan increases. The air volume increases. Further, the output shaft 116a of the baffle plate driving motor 116 is driven to rotate clockwise, and the moving belts 120 and 123 rotate clockwise, respectively, so that the main flow path 105 and the inlets 111b and 113b are wide. Become. With this, the area of the main flow path 105 and the inlet 1
11b, 113b and the area of the branch flow paths 111, 113 are increased, and the branch flow path 1 from the inflow ports 111b, 113b.
The air flow per unit time introduced into 11, 113 increases.

Therefore, the upstream end 47 of the paper transport path 47
a and the downstream end 47b increase the flow rate of air blown to the downstream end 47b.
The flow rate of air blown to the large-sized paper 22 located in the vicinity of A and 1B increases. In addition, when the inflow ports 111b and 113b are widened, the branch flow path 112 is narrowed, but the main flow path 105 is widened and the amount of air per unit time generated by the blower fan 46 is also large. The air flow rate is relatively increased, and a sufficient air flow is blown over the entire upper surface 16b of the transport belt 16a.

When the sheet 22 is small, the contact surface between the sheet 22 and the plate cylinder 1A is small, and the length in the transport direction X is short. Therefore, by suppressing the rotation of the blower motor 49, the heating of the blower motor 49 can be reduced, thereby increasing the durability of the motor and saving energy of the apparatus. When the paper 22 is large, the contact surface between the paper 22 and the plate cylinder 1A is large, and the length in the transport direction X is also long.
In such a case, the rotation of the blower motor 49 is increased, and the main flow path 105 and the branch flow paths 111 and 113 are widened so that the paper 2
By increasing the flow rate of air blown to the sheet 2, it is possible to improve the separation and peeling property of the sheet 22 from the plate cylinder 1A and the penetration of the sheet 22 into the printing position E2 even for a large-sized sheet 22.

The blower fan 46 according to the size of the paper 22
By changing the amount of airflow per unit time generated in the above and the area of the flow path for blowing this airflow toward the paper 22, the amount of airflow blown to the paper 22 can be automatically adjusted more finely. With the separation / peelability of the paper 22 from the plate cylinder 1A and the penetration into the printing position E2,
The transport performance of the paper 22 can be improved. By operating the paper size selection key 79 in this manner, the blower motor 49 and the wind guide plate drive motor 116 are controlled to
By automatically adjusting the blowing amount of the airflow with respect to 2, it is possible to reduce image double printing while shortening the adjustment time.

In this embodiment, a paper size selection key 79 operated by manual operation as a paper size setting means.
However, the present invention is not limited to this. As an example, a known photo-interrupter type optical sensor having a light projecting element and a light receiving element, and a shielding member slidably provided according to the size of the paper 22 and shielding the optical sensor according to the paper size are fed. The paper size setting means may be provided on the tray 21 to automatically detect the paper size when the paper 22 is set on the paper feed tray 21.

The sixth embodiment is provided with the air volume selection key 44 as in the fifth embodiment. When the air volume selection key 44 is pressed, the signal from the adjustment key 78 has priority over the control based on the size of the paper 22. The manual mode is set so that the voltage is applied to the blower motor 49 from the voltage variable device 94 in a stepwise manner by pressing the up key 78b or the down key 78a. You may make it increase or decrease the air volume of the airflow per hit. In this way, even if a trouble occurs in the control system corresponding to the size of the paper 22, the adjustment key 78 is checked while viewing the state of the image printed on the paper 22.
, The amount of air flow blown onto the sheet 22 can be manually adjusted, and the sheet transfer performance can be improved together with the separation / separation of the sheet 22 from the plate cylinder 1A and the penetration into the printing position E2. Thus, the occurrence of image double printing can be stably reduced.

The air volume selection key 44 and the adjustment key 78 used in the fifth embodiment are connected to the control means 90 of the third embodiment,
When the air volume selection key 44 is pressed, the paper type selection key 43
A manual mode in which the signal from the adjustment key 78 has priority over the signal from the control key 78 may be set. In this way, even if a trouble occurs in the control system corresponding to the type of the paper 22, by operating the adjustment key 78 while observing the state of the image printed on the paper 22, the amount of airflow blown to the paper 22 can be increased. Can be adjusted manually, the sheet 22 can be separated and separated from the plate cylinder 1A, and the sheet 22 can enter the printing position E2, and the sheet conveying performance can be improved, and the occurrence of image double printing can be stably reduced. become able to.

In the third embodiment, the amount of air generated by the blower fan 46 is controlled using the paper type selection key 43 in accordance with the type (thickness) of the paper. As in the sixth embodiment, the amount of air generated by the blower fan 46 may be controlled according to the size of the paper 22 using the paper size setting key 79. In this case, when the size of the sheet 22 is large, the amount of air generated by the blowing fan 46 is increased, and when the size of the sheet 22 is small, the amount of air generated by the blowing fan 46 is controlled to be small. , The separation of the large-size sheet 22 from the plate cylinder 1A and the penetration into the printing position E2 can be enhanced, and image double printing can be reduced.

In the fifth embodiment, the amount of air generated by the blower fan 46 is manually adjusted by controlling the blower motor 49 using the adjustment key 78. However, the rotation of the wind guide plate drive motor 116 is controlled together with the blower motor 49. To increase or decrease the flow path area to manually adjust the blowing amount of the airflow to the paper 22.
6 alone may be controlled alone to manually adjust the blowing amount of the airflow onto the sheet 22.

[0142]

According to the first aspect of the present invention, the airflow generated by the air supply source in the paper transport path formed between the upstream plate cylinder and the downstream plate cylinder by the air guide member is efficiently used. As the air is guided and blown, the separation performance between the plate cylinder on the upstream side and the paper is improved, and the paper is pressed against the suction conveyance device to improve the conveyance performance, and when the paper enters the plate cylinder on the downstream side. When the air is blown to the leading edge of the sheet, the performance of the sheet entering the plate cylinder on the downstream side is improved, and image double printing can be reduced.

According to the second aspect of the present invention, since the air flow from the blowing source is efficiently blown between the tip of the separation claw and the outer peripheral surface of the plate cylinder, the paper flow from the upstream plate cylinder can be reduced. Separation / peeling performance becomes more reliable, and image double printing can be further reduced.

According to the third aspect of the present invention, the air flow is simultaneously blown to at least two positions on the sheet transport path by the air supply source of the intermediate blowing means and the air guide member, so that the upstream plate cylinder and the sheet And at least two of the sheet separation performance, the conveyance performance in the suction conveyance device, and the paper entry performance to the downstream plate cylinder, are simultaneously improved, and image double printing can be further reduced.

According to the fourth aspect of the present invention, the amount of air generated at the air supply source is controlled by the control means in accordance with the input information from the paper information input means, thereby blowing the airflow onto the paper on the paper transport path. Since the amount can be adjusted in a short time, the separation performance between the plate cylinder on the upstream side and the sheet and the sheet conveyance performance of the suction conveyance device are improved, and the performance of the sheet entering the plate cylinder on the downstream side is improved. It is possible to improve the image double printing.

According to the fifth aspect of the present invention, the amount of air flow blown to the sheet conveyed on the sheet conveying path can be varied by adjusting the amount of air generated by the air supply source independently of the sheet information inputting means by the air amount setting means. Even if there is a problem with the control system by the paper information input means, the separation performance between the upstream plate cylinder and the paper, the paper transport performance in the suction transport device, and the paper entry performance into the downstream plate cylinder are controlled. Can be improved, and the image double printing can be stably reduced while shortening the adjustment time.

According to the sixth aspect of the present invention, since the flow rate of the air flow blown to the paper on the paper transport path is adjusted by changing the flow area of the air flow, the flow rate between the upstream plate cylinder and the paper is increased. The separation performance, the paper conveyance performance in the suction conveyance device, and the performance of the paper entering the plate cylinder on the downstream side are improved, and image double printing can be further reduced.

According to the seventh aspect of the present invention, since the amount of air generated by the blower, the flow area of the air flow, or both the generated air volume and the flow area are controlled by the control means, the plate cylinder on the further upstream side is controlled. The separation performance between paper and paper, the conveyance performance of paper in the suction conveyance device, and the performance of paper entering the plate cylinder on the downstream side are improved, and image double printing can be more reliably reduced while shortening the adjustment time.

According to the eighth aspect of the invention, the air volume generated by the air supply source, the flow area of the air flow, or the generated air volume and the flow area are individually variably controlled by the air volume setting device and the paper information input device. Therefore, even if there is a problem with the control system using the paper information input means, the performance of separating the paper from the plate cylinder on the upstream side, the paper transport performance by the suction transport device, and the performance of the paper entering the downstream plate cylinder are improved. In addition, image double printing can be stably reduced.

According to the ninth aspect of the invention, by controlling the amount of air generated by the air supply source and the area of the flow path, or both the amount of generated air and the area of the flow path, according to the type and size of the paper, It is possible to automatically or semi-automatically increase or decrease the blowing amount of the air flow on the paper transported on the path,
It is possible to further improve the separation performance between the plate cylinder and the sheet on the upstream side, the conveyance performance by the suction conveyance device, and the performance of the sheet entering the plate cylinder on the downstream side, and reduce image double printing more reliably.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a stencil printing apparatus showing a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control unit according to the first embodiment.

FIG. 3 is a partially broken plan view showing a configuration of an operation panel of the stencil printing apparatus.

FIG. 4 is an enlarged view showing the configuration and operation of the intermediate blowing means in the first embodiment.

FIG. 5 is an overall configuration diagram of a stencil printing apparatus showing a second embodiment of the present invention.

FIG. 6 is an enlarged view showing a configuration and an operation of an intermediate blowing unit in a second embodiment.

FIG. 7 is a block diagram showing a configuration of a control unit which is a main part of a third embodiment of the present invention.

FIG. 8 is an overall configuration diagram of a stencil printing machine showing a fourth embodiment of the present invention.

FIG. 9 is an enlarged view showing the configuration and operation of an intermediate blowing unit and a variable mechanism in a fourth embodiment.

FIG. 10 is an enlarged view showing the operation of an intermediate blowing means and a variable mechanism in a fourth embodiment.

FIG. 11 is a side view showing the configuration of the variable mechanism.

FIG. 12 is a block diagram illustrating a configuration of a control unit according to a fourth embodiment.

FIG. 13 is a block diagram illustrating a configuration of a control unit that forms a main part of a fifth embodiment of the present invention.

FIG. 14 is a block diagram illustrating a configuration of a control unit that is a main part of a sixth embodiment of the present invention.

[Explanation of symbols]

1A, 1B Plate cylinder 1Aa, 1Ba Outer peripheral surface 7a Separating claw 16b Conveying surface of suction conveyance device 17a Suction conveyance device 22 Paper 33a, 33b Master 43 Paper information input means (paper identification means) 44, 78 Air volume setting means 45, 99 Intermediate Blowing means 46 Blowing source 47 Paper transport path 47a Upstream end of paper transport path 47b Downstream end of paper transport path 48 Air guide member 55, 57, 58, 59 Flow path 57a Air outlet 65 Tip of separation claw and rotation center of plate cylinder 66 Tangential line 79 Paper information input means (paper size setting means) 90, 132, 140, 150 Control means 95, 96, 97, 98 Plural wind guide members 100 Variable mechanism 105, 111, 112, 113 Channel X Transport direction

Claims (9)

[Claims] A plurality of plate cylinders having a prepressed master wound on an outer peripheral surface thereof and driven to rotate are arranged in parallel at intervals in a sheet conveying direction, and are provided between the two plate cylinders at an upstream side in the conveying direction. In a stencil printing apparatus in which a suction conveyance device that suctions and conveys a sheet printed by a located plate cylinder toward a plate cylinder positioned downstream in the conveyance direction is arranged, an air flow is generated above the suction conveyance device. And an air guide member that forms a flow path that sends an air flow from the air supply source to a paper transport path formed between the upstream plate cylinder and the downstream plate cylinder. A stencil printing machine characterized by having a blowing means. 2. A stencil printing apparatus according to claim 1, wherein a separation claw provided so as to be capable of approaching and separating from said upstream plate cylinder is provided between said two plate cylinders, and a flow path formed by said wind guide member. The air flow from the air supply source can be blown in a tangential direction at a point where a line connecting the tip of the separation claw and the rotation center of the upstream plate cylinder intersects with the outer peripheral surface of the plate cylinder. A stencil printing apparatus, wherein the stencil printing apparatus is provided. 3. The stencil printing apparatus according to claim 1, wherein the air guide member is provided at an upstream end of the sheet transport path located near the upstream plate cylinder and at a downstream end of the downstream plate cylinder. A flow path for blowing airflow from the air supply source is formed in at least two portions of a downstream end of the paper conveyance path located in the vicinity and a conveyance surface of the suction conveyance device. Stencil printing machine. 4. A stencil printing apparatus according to claim 1, wherein said sheet information input means for inputting information of said sheet, and operation of said air supply source in accordance with input information from said sheet information input means. A stencil printing apparatus comprising: a control unit for controlling the stencil printing apparatus. 5. A stencil printing apparatus according to claim 4, further comprising an air volume setting means connected to said control means, wherein said control means controls the operation of said air supply source in response to a signal from said air volume setting means. A stencil printing apparatus, wherein the stencil printing apparatus is controlled separately from input information from the paper information input means. 6. A stencil printing apparatus according to claim 1, wherein a plurality of said air guide members are provided, and said plurality of air guide members can be moved in parallel in a direction orthogonal to said tangential direction. A stencil printing machine having a variable mechanism. 7. A stencil printing apparatus according to claim 6, wherein said paper information input means for inputting said paper information, and said variable mechanism or said variable mechanism and said air blower in accordance with the input information from said paper information input means. Control means for controlling the operation of the source. 8. A stencil printing apparatus according to claim 7, further comprising an air volume setting means connected to said control means, wherein said control means responds to a signal from said air volume setting means so that said air supply source or said variable mechanism is changed. Alternatively, the stencil printing apparatus is characterized in that the operations of the air supply source and the variable mechanism are controlled separately from the input information from the paper information input means. 9. The stencil printing apparatus according to claim 4, wherein said sheet information input means outputs a signal corresponding to a type of said sheet to said control means, A stencil printing apparatus comprising a sheet size setting means for outputting a corresponding signal to the control means.