JP3288808B2 - Stencil printing method and stencil printing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing method and a stencil printing apparatus, and more particularly, to make a master made of a thermoplastic resin film and a porous flexible support, and wind the master around a plate cylinder for printing. The present invention relates to a stencil printing method and a stencil printing apparatus.

[0002]

2. Description of the Related Art A porous support cylinder and a mesh screen layer, which is a mesh of resin or metal fibers, have a thermoplastic resin film (hereinafter simply referred to as "film") on the outer peripheral surface thereof and a porous film. A roll-shaped stencil master, which is formed of a flexible ink-permeable support and is wound around a master for stencil printing, and an ink supply member that contacts the inner peripheral surface of the plate cylinder and supplies ink. Then, a stencil printing apparatus is used in which the outer peripheral surface of the plate cylinder is pressed by a press roller or the like through a printing paper to exude ink from an opening portion of the support cylinder and a master perforated portion to print on the paper. A known stencil printing method is known. Generally, in a stencil printing machine of the type described above, the ink in the plate cylinder evaporates when the apparatus is left unused for a long time, and the next time printing is performed, waste paper (broken paper) due to lack of ink is generated. To minimize the occurrence,
An oil type ink that is difficult to evaporate and dry is used, and the ink transferred to the paper at the time of printing penetrates into the paper, so that even when rubbed with a finger or the like, a stain is not generated. However, in the stencil printing method, the ink is extruded from the perforated portion of the master to the surface of the paper, so that it takes a certain amount of time until the ink is set. If the next sheet is stacked before the setting is completed, the ink in the image portion of the previous sheet is transferred to the back side of the stacked upper sheet, and a so-called show-through problem occurs.

Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-361043, there has been proposed a technique relating to a stencil printing method for eliminating show-through by reducing the amount of ink transferred to a sheet.

Further, printing is not performed in one color.
As disclosed in Japanese Patent Application Laid-Open No. 3-14069, a master is wound around a plurality of plate cylinders, and one of the plate cylinders is brought into contact with and separated from the other plate cylinder to perform color polymerization, and this superimposed color image is transferred to a sheet. Technology has been proposed.

[0005]

However, in the former case, the surface of the paper is uneven at the scale level of the master perforated portion, and when the paper is pressed by the pressing means, the master is compressed and the ink becomes uneven on the paper surface. When the paper is peeled, the contact area increases when the paper is peeled off, making it difficult for the ink to run out. By drawing the ink filled in the master from the master, the ink rises on the paper. There is a problem that cannot prevent transfer.

In the latter, printing is performed by wrapping the support side of the plate-making master around the outer peripheral surface of the plate cylinder with the film side facing outward on the outer peripheral surface side of the plate cylinder. The ink transferred to the surface of the paper printed on the upstream plate cylinder when pressed and printed through the printed paper is the film of the pre-mastered master wound around the downstream plate cylinder. Although slightly on the outer surface,
Adherence is inevitable. Therefore, there is no problem if the second and subsequent sheets are fed without any deviation, but if there is any deviation, the transfer from the master surface of the plate-making master wound on the downstream plate cylinder adheres to the outer surface of the film. There is a problem that the ink is re-transferred to the printed paper sequentially printed on the upstream side, resulting in a double image.

The support is made of Japanese paper fiber of about 30 to 50 μm. When the master is wound around the plate cylinder, ink is filled in the support corresponding to the opening of the plate cylinder. When the plate is discharged, the filled ink is discarded, so that the ink is wasted. For example, 10%
In the case of a printed matter of the size of an image, the amount of ink capable of printing several tens of sheets is discarded for each plate discharge.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stencil printing method and a stencil printing apparatus that can reduce the waste of ink in order to solve such problems.

[0009]

According to the first aspect of the present invention, there is provided a master storage means for storing a master comprising a thermoplastic resin film and a porous flexible support. Plate-making means for plate-making the master based on image information, a plate-making section comprising cutting means for cutting the master, and a plate cylinder around which the master is wound around an outer peripheral surface and rotated around a rotation center axis, Ink supply means for supplying ink to the inner peripheral surface of the plate cylinder; clamp means provided on the outer peripheral surface for clamping the leading end of the master;
A printing unit comprising a pressing means for pressing the paper for printing on the outer peripheral surface, in the stencil printing method using a stencil printing machine having a stencil discharge section for peeling plate discharge the used master from said outer peripheral surface, the plate Paper with at least two cylinders
The outermost surface of the uppermost plate cylinder located at the uppermost stream of the conveyance path
Place the support side of the printed master on the outer periphery of the topmost printing cylinder
Wrap around the surface with the above thermoplastic resin film side facing out
In addition, on the outer peripheral surface of the downstream plate cylinder located on the downstream side, the thermoplastic resin film side of the plate-making master is placed on the downstream plate cylinder.
And performing printing on the Symbol support side put come wound in the outside peripheral surface side of the.

[0010] According to the second aspect of the present invention, the thermoplastic resin foil is used.
Holds master consisting of film and porous flexible support
Master storage means for performing
Plate making means for making a plate, and cutting means for cutting the master
And the master is wound around the outer peripheral surface.
A plate cylinder rotating about a rotation center axis and an inner periphery of the plate cylinder
Ink supply means for supplying ink to the surface, and on the outer peripheral surface
Clamping means for clamping the tip of the master
And pressing means for pressing the printing paper against the outer peripheral surface.
Remove the used master from the printing section
A perforation using a stencil printing apparatus having a plate discharge section for separating and discharging a plate.
In the plate printing method, the plate cylinder has at least two plate cylinders,
Excluding the most upstream plate cylinder located at the most upstream of the paper transport path,
A stencil printing method in which the thermoplastic resin film side of the plate-making master is wrapped around the outer peripheral surface of the downstream plate cylinder with the support side facing outward, and printing is performed on the outer peripheral surface of the downstream plate cylinder located on the downstream side. The plate making section of the downstream plate cylinder
If no prepress command is issued, the outer peripheral surface of the downstream plate cylinder
In addition, the thermoplastic resin film side of the
Winding the outer periphery of the downstream plate cylinder with the support side facing outward
After attaching the unprinted master through the printed paper
It is characterized by being pressed by the pressing means .

According to a third aspect of the present invention, in the stencil printing method according to the second aspect, the downstream plate cylinder includes the printed cylinder.
Hand to shift the printing position on the paper
It is connected to the uppermost printing cylinder by a step,
The method is characterized in that the recording / removing means is operated .

According to a fourth aspect of the present invention, in the stencil printing method according to the second aspect , until the stencil making command is issued,
It is especially important to continue winding the unprinted master.
Sign .

[0013] inventions of claim 5, wherein the thermoplastic resin film
Storing master consisting of lum and porous flexible support
Master storage means for storing the master based on image information.
Plate making means for making a plate, and cutting means for cutting the master
The master making part with
Plate cylinder rotating about a rotation center axis, and an inner peripheral surface of the plate cylinder
Ink supply means for supplying ink to the outer peripheral surface
Clamping means provided to clamp the tip of the master
And pressing means for pressing the printing paper against the outer peripheral surface.
Remove the used master from the printing section
A stencil printing machine having a stencil removing section
At least two plate cylinders arranged along a paper transport path
These plate cylinders have the uppermost stream of the paper transport path.
The uppermost plate cylinder and the uppermost plate cylinder
And a downstream plate cylinder located downstream of the paper transport path.
The driving force is transmitted between the uppermost plate cylinder and the downstream plate cylinder.
Mechanism in the rotation direction of the downstream plate cylinder.
Phase with respect to the rotational phase of the uppermost plate cylinder.
The print position on the printed paper
Having a vertical moving means for biasing, wherein the downstream plate cylinder has
If no prepress command is issued to the prepress section, the master
The thermoplastic resin film side is the outer peripheral surface side of the downstream plate cylinder.
Then, printing is performed after winding with the support side facing out.
At the time of this printing, the top and bottom moving means is operated, and
The unprinted plate master presses the
It is characterized by being pressed by means .

[0014]

[0015]

According to the first aspect of the present invention, at least the plate cylinder is required.
Upstream plate located at the uppermost stream of the paper transport path
On the outer peripheral surface of the body, the support side of the master
Wrap the thermoplastic resin film side outside on the outer peripheral side of the body.
It can attach to the outer peripheral surface of the downstream position plate cylinder, since the printing of the thermoplastic resin film side of the stencil master the supporting lifting side to the outer peripheral surface of the downstream position plate cylinder put come in the outside winding, upstream Plate cylinder
Excess ink on the printed paper printed in step is absorbed by the support
Is done .

According to the second aspect of the present invention, when the plate making command is not issued to the plate making section of the downstream plate cylinder, the outer periphery of the downstream plate cylinder is output.
Surface, the thermoplastic resin film side of the blank master is downstream
After winding around the outer circumference of the plate cylinder with the support side facing out
Press the blank master with the pressing means via the printed paper.
Pressure, so that the printed paper is
The upper stack is generated when stacking
Excess transfer ink transfers to the back side of the printed printed paper
It is possible to prevent show-through .

According to the third aspect of the invention, the downstream plate cylinder is provided.
Is used to shift the printing position with respect to the printed paper.
It is connected to the uppermost plate cylinder by means of vertical and
Since the top and bottom moving means is operated,
The show-through prevention effect in light can be maintained for a long time .

According to the fourth aspect of the present invention, the plate making instruction is
Until it comes out, continue winding the blank master
By doing so, in addition to the effect of the invention described in claim 2,
Since it is not necessary to replace the master for each plate,
In case, the master is wasted by cutting the plate
Can be prevented .

According to the fifth aspect of the present invention, the most upstream version
The cylinder and the downstream plate cylinder are connected by a driving force transmission mechanism,
Set the phase of the rotation direction of the downstream plate cylinder to the rotation direction of the uppermost plate cylinder.
To the printed paper
A vertical moving means for biasing the printing position with respect to the
If no prepress command is issued to the prepress section of the plate cylinder,
The thermoplastic resin film side of the star is the outer peripheral surface side of the downstream plate cylinder.
Then, after winding with the support side outside, printing is performed,
At the time of this printing, the top and bottom moving means is activated and the printed
The blank master is pressed by the pressing means via the paper
In the continuous printing of paper, the printed paper
Loaded on the upper stage, which occurs when loading by being forked
Excess transfer ink is transferred to the back of the printed paper.
The effect of preventing show-through can be maintained for a long time .

[0020]

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a configuration of a double-cylinder stencil printing machine to which an embodiment of the present invention is applied. First, the overall configuration will be described.

In FIG. 1, reference numeral AB denotes a double-cylinder stencil printing apparatus. The stencil printing machine AB includes a first stencil making unit 100 for making a first master 2 which is arranged at the upper right in the figure and wound in a roll shape, and a second master 21 arranged in the upper left in the figure and wound in a roll shape. A first printing unit including a second plate making unit 110 for making a plate, and a first plate cylinder 1 which is arranged at a substantially right central portion in the figure of the stencil printing apparatus AB and winds the first master 2A having the plate made on the outer peripheral surface thereof. 200 and a stencil printing apparatus AB, a second printing unit 210 provided with a second plate cylinder 20 which is disposed at a substantially central portion on the left side and winds a second master 21A having a stencil around its outer peripheral surface, and a first stencil unit 100
And a second printing unit 2 opposed to the feeding unit 400 for sending the paper 40 stacked on the feeding table 39 to the first printing unit 200 and the second printing unit 210.
10, a printed sheet (not shown) printed by the first plate cylinder 1 and the second plate cylinder 20 is discharged from the discharge tray 50.
Discharging section 500 for discharging paper to the first printing section 200 and a first discharging section for discharging a used first master (not shown) which is disposed at the upper left of the first printing section 200 and is peeled off from the outer peripheral surface of the first plate cylinder 1. 300
And the second plate cylinder 20 disposed on the left side of the second printing unit 210.
And a second plate discharge section 310 for discharging a used second master (not shown) peeled off from the outer peripheral surface of the plate.

The first plate making section 100 and the second plate making section 1
10, the respective configurations and functions of the two devices of the first printing unit 200 and the second printing unit 210, the first plate discharging unit 300 and the second plate discharging unit 310 are basically the same except for the arrangement state of each component and the operation order. Are the same. Also, the first plate cylinder 1 and the second plate cylinder
The positional relationship with the plate cylinder 20 is such that the first plate cylinder 1 is located at the most upstream plate cylinder located at the most upstream position of the sheet transport path of the sheet 40,
0 corresponds to a downstream plate cylinder located downstream of the paper transport path.

Hereinafter, the first plate making section 100 and the second plate making section
Plate making section 110, first printing section 200, and second printing section 21
0, first plate discharging section 300, second plate discharging section 310, sheet feeding section 4
00 and the paper discharge unit 500 will be described sequentially.

In FIG. 1, the first plate making section 100 includes a thermoplastic resin film 2b (hereinafter simply referred to as “film 2b”) and a porous flexible support 2a (both shown in FIG. 3).
A first master storage means 13 for storing a first master 2 for stencil printing in the form of a roll, a first thermal head 12 for perforating and making a first master 2 based on image information, and a first master 2 The first plate making means 60 includes a first platen roller 11 that conveys the sheet to the downstream side of the master conveyance path while pressing the first master cutting path. The first plate making means 60 is provided on the downstream side of the master conveyance path and cuts the first master 2. First as cutting means
It is mainly composed of cutters 14a and 14b.

The first platen roller 11 is rotatably supported on a side plate (not shown) of the stencil printing machine AB, and is driven to rotate in the direction of arrow B by a stepping motor (not shown). The first thermal head 12 has a plurality of heating elements arranged in a line, and generates heat in a pulsed manner by digital image information sent from a document reading unit (not shown) to selectively heat the film 2b (shown in FIG. 3). It has a well-known configuration and function for piercing. The first master 2 is wound around a paper core 13s in a roll shape to form a first master roll 13R. On the side plate (not shown) of the stencil printing machine AB, the first master 2 is marked with an arrow A from the first master roll 13R.
A first paper core support portion (not shown) as first master storage means 13 for supporting the paper core 13s so as to be able to be fed in the direction is provided. On the downstream side of the master transport path of the first cutter pair 14a, 14b, the tip of the first master 2 is
A first guide plate 16 for guiding to a clamper 3 (described later) and a first auxiliary roller 15 for assisting the conveyance of the first master 2, which is rotationally driven in the direction of arrow A by a stepping motor (not shown), are provided. Are located.

As with the first plate making section 100, the second plate making section 1
Reference numeral 10 denotes a roll formed of a thermoplastic resin film 21b (hereinafter, simply referred to as "film 21b") and a porous flexible support 21a (both shown in FIG. 4), as shown in FIGS. A second master storage means 32 for storing the second master 21 for stencil printing, a second thermal head 31 for perforating and making the second master 21 based on image information, and a master while pressing the second master 21 against the second thermal head 31. A second plate making means 70 having a second platen roller 30 for conveying the sheet to the downstream side of the conveying path, and a second plate making means provided on the downstream side of the master conveying path and serving as cutting means for cutting the second master 21. It is mainly composed of one cutter 33a and 33b.

The second platen roller 30 is rotatably supported by a side plate (not shown) of the stencil printing machine AB, and is driven to rotate in the direction of arrow A by a stepping motor (not shown). The second thermal head 31 has a well-known configuration in which a plurality of heating elements are arranged in a line, and generates heat in a pulse by digital image information sent from a document reading unit (not shown) to selectively heat and perforate the film 21b. Has functions. The second master 21 is wound around a paper core 32s in a roll to form a second master roll 32R. On a side plate (not shown) of the stencil printing machine AB, a second paper core as second master storage means 32 for supporting the paper core 32s so that the second master 21 can be fed in the direction of arrow B from the second master roll 32R. A support (not shown) is provided.

At the downstream side of the master transport path of the second cutters 33a and 33b, the tip of the second master 21 is
A second guide plate 35 for guiding to 2 (described later);
A second auxiliary roller 34, which is driven to rotate in the direction of arrow A by a stepping motor (not shown) for assisting the conveyance of the second master 21, is provided.

The first printing unit 200 includes a first plate cylinder 1 wrapped around an outer peripheral surface and a first plate cylinder 1 that rotates around a first rotation center axis 5, and an inner peripheral surface of the first plate cylinder 1. First ink supply means 80 for supplying ink to the first plate cylinder, first clamping means 85 provided on the outer peripheral surface of the first plate cylinder 1 for clamping the leading end of the first master 2A after plate making, and first plate cylinder 85 And a first press roller 9 as a first pressing means for pressing a sheet (not shown) against the outer peripheral surface of the first plate cylinder 1 provided near the outer peripheral surface of the first plate cylinder 1.

The first plate cylinder 1 has a structure in which a mesh screen is wound around a supporting cylinder having a large number of apertures and an outer peripheral surface thereof, and is rotatable about a first rotation center axis 5. It is supported by. The first plate cylinder 1 is driven to rotate clockwise and counterclockwise by a motor (not shown). A first stage 4 is provided on the outer periphery of the first plate cylinder 1 along a generatrix of the first plate cylinder 1. On the first stage 4, a first clamper 3 is pivoted in parallel with the first stage 4. It is arranged rotatably by 3s. The first clamper 3 is opened and closed at a predetermined position by opening and closing means (not shown). As described above, the first clamp means 85 mainly includes the first clamper 3 and the first stage 4.

As will be described later in the operation, the film side of the master 2 is the pressing surface side with the first thermal head 12 so that the master 2 of the first plate making section 100 can clearly see the plate making state. As shown in FIG. 3, the outer peripheral surface of the first plate cylinder 1 has the support 2a side of the plate-making master 2A on the outer peripheral surface side of the first plate cylinder 1 and the film 2b side on the outer side. The prepressed master 2A is wound in the same manner as in the printing method.

The first ink supply means 80 is disposed inside the first plate cylinder 1 and is rotatably supported by a side plate (not shown) in the first plate cylinder 1. Body 1
A first ink roller 6 driven to rotate in synchronization with the first
A first doctor roller 7 which is provided with a slight clearance from the outer surface of the ink roller 6 and forms a wedge-shaped first ink reservoir 8 with the first ink roller 6; And a first ink pipe shaft 5 for supplying ink to the first ink reservoir 8.

At a lower position facing the first ink roller 6, a first press roller 9 is disposed so as to be able to contact and separate from the first plate cylinder 1, and the first press roller 9 is provided with a cam and a spring (not shown). It has a well-known structure of selectively contacting and separating from the first plate cylinder 1 by a mechanism provided. When the paper (not shown) is fed, the first press roller 9 presses against the first plate cylinder 1 via the paper (not shown), and continuously rotates the paper (not shown) while being driven to rotate. Is pressed against the first plate cylinder 1.

Similarly to the first printing unit 200, the second printing unit 2
Reference numeral 10 denotes a second plate cylinder 20 around which a plate-making second master 21A is wound around the outer peripheral surface and rotates around a second rotation center axis 24.
An ink supply means 90 for supplying ink to the inner peripheral surface of the second plate cylinder 20; and a second ink supply means 90 for clamping the leading end of the second master 21A, which is provided on the outer peripheral surface of the second plate cylinder 20. 2
A second press roller 28 serving as a second pressing means for pressing a sheet (not shown) against the outer peripheral surface of the second plate cylinder 20, provided near the outer peripheral surface of the second plate cylinder 20; Mainly composed of

As in the case of the first plate cylinder 1, the second plate cylinder 20 has a structure in which a mesh screen is wound around a supporting cylinder having a large number of apertures and an outer peripheral surface thereof.
It is rotatably supported around the second rotation center axis 24. The second plate cylinder 20 is driven to rotate clockwise and counterclockwise by a motor (not shown). 2nd plate cylinder 2
0, a second stage 23 is provided along the generatrix of the second plate cylinder 20, and the second stage 23
The clamper 22 is rotatably provided by a pivot 22 s parallel to the second stage 23. The second clamper 22 is opened and closed at a predetermined position by opening and closing means (not shown). As described above, the second clamping means 95 mainly includes the second clamper 22 and the second stage 23.

As will be described later in the operation, the film side of the master 21 is on the pressing surface side with the second thermal head 31 so as to be clear from the plate making state of the master 21 of the second plate making section 110. As shown in FIG.
The film 21b side of the master 21A having the stencil master is on the outer peripheral surface side of the second plate cylinder 20 and the support 21a side is the outer side, that is, the stencil printing method is reversed with respect to the conventional stencil printing method. The completed master 21A is wound.

The second ink supply means 90 includes the second plate cylinder 20.
A second ink roller 25 that is disposed inside, is rotatably supported by a side plate (not shown) in the second plate cylinder 20, and is driven to rotate in synchronization with the second plate cylinder 20 in the direction of arrow B in the figure.
And a second doctor roller 2 which is provided with a slight gap from the outer surface of the second ink roller 25 and forms a wedge-shaped second ink pool 27 between the second doctor roller 2 and the second ink roller 25.
6 and the rotation center axis 24 and the second ink reservoir 2
And a second ink pipe shaft 24 for supplying ink to the nozzle 7.

At a lower position facing the second ink roller 25, a second press roller 28 is disposed so as to be able to contact and separate from the second plate cylinder 20, and the second press roller 28 is provided with a cam and a spring (not shown). The second plate cylinder 20 is provided by the mechanism provided.
And a well-known configuration for selectively approaching / separating to / from the camera. The second press roller 28 presses against the second plate cylinder 20 via the sheet (not shown) when the sheet (not shown) is fed, and continuously rotates the sheet (not shown) while being driven to rotate. Is pressed against the second plate cylinder 20.

The first plate discharging unit 300 is disposed on the upper left side of the first plate cylinder 1 in the drawing, and the first lower plate discharging roller 18 moves to the first plate cylinder 1 when the first plate cylinder 1 rotates counterclockwise. A pair of a first upper plate discharging roller 17 and a first lower plate discharging roller 18 that come into contact with each other and scoop up a used first master (not shown) from its rear end and discard it into a first plate discharging box 19 (described later); 1st stencil discharge box 1 for accommodating 1 master (not shown)
9 is provided. The first upper plate discharging roller 17 and the first lower plate discharging roller 18 are driven to rotate by a motor (not shown).

Similarly to the first plate discharging unit 300, the second plate discharging unit 3
10 is disposed on the left side in the drawing of the second plate cylinder 20,
When the second plate cylinder 20 rotates in the counterclockwise direction, the second lower plate discharging roller 37 comes into contact with the second plate cylinder 20, and the used second master (not shown) is scooped up from its rear end.
8 (described later) includes a pair of second upper discharging rollers 36 and second lower discharging rollers 37, and a second discharging box 38 for storing a used second master (not shown). The second upper plate discharging roller 36 and the first lower plate discharging roller 37 are driven to rotate by a motor (not shown).

The paper supply unit 400 includes a pair of registration rollers 43a and 43b for feeding the paper 40 at a predetermined timing between the first press roller 9 and the first plate cylinder 1, and a paper 40 on the paper supply table. It is composed of a paper feed roller 41 for distributing paper, and a separation roller 42 pressed against the paper feed roller 41 and separating the paper 40 into one sheet.

A first sensor 44 for detecting whether or not the paper 40 is fed is disposed in the paper feed path between the pair of registration rollers 43a and 43b and the first press roller 9. In the paper feed path between the first press roller 9 and the second press roller 28, a porous transport belt 47 stretched over a first belt transport roller 45 and a second belt transport roller 46 is stretched. The first printing drum 1 is driven in synchronization with the first printing drum 1 at a transport speed substantially equal to the peripheral speed of the first printing drum 1. In the transport belt 47, a suction fan 48 for sucking and transporting a printed sheet (not shown) is provided. In the drawing of the first press roller 9, a first peeling for separating a printed sheet (not shown) close to the first plate cylinder 1 in synchronization with the first press roller 9 is provided on a master transport path obliquely upper left. A nail 10 is provided. Above the conveyor belt 47, a second sensor 4 for detecting a printed sheet (not shown) sent from the first plate cylinder 1 is provided.
9 are arranged. In the drawing of the second press roller 28, the second press roller 2
8, a second peeling claw 29 is provided for peeling overprinted paper (not shown) which is adjacent to the second plate cylinder 20 and is overprinted.

(Operation of First Embodiment) Next, the operation of the stencil printing apparatus will be described below with reference to FIGS. First, a document is set on a platen of a document image reading unit (not shown) of the stencil printing apparatus AB, and an image area to be printed by the first plate cylinder 1 and the second plate cylinder 20 is set by a print area designating device such as a digitizer. An operation is performed, and then a start signal is transmitted by pressing a start key on an operation panel (not shown). While a document is sent by a document feeder (both not shown), its optical information is converted into an electrical signal by a CCD (Charge Coupled Device) not shown, and an A / D (analog / analog) not shown.
The digital signal is written to a memory device (not shown) via a (digital) converter. At the same time, a motor (not shown) rotates, and the first plate cylinder 1 and the second plate cylinder 20 rotate in the counterclockwise direction, and the first plate discharging unit 300 and the second plate discharging unit 310 use the used first and second plate discharging units, respectively. The two masters (not shown) are peeled from the rear end and discharged into the first and second plate discharging boxes 19 and 38, respectively.

Next, the first plate cylinder 1 is rotated by the driving of a motor (not shown), the first plate cylinder 1 is stopped at the right side position shown in FIG. 1, that is, at the plate feeding position, and the first clamper 3 is not shown. It is opened by the switchgear. At substantially the same time, the first platen roller 11 starts to be driven to rotate by a stepping motor (not shown), and the first master (not shown) starts to be conveyed from the first master roll 13. Then, the first thermal head 12 is driven while a digital signal (not shown) is read from the memory device (not shown),
The plate making of the first plate making section 100 is started. The leading end of the prepressed first master (not shown) is fed by the first auxiliary roller 15 while being guided by the first guide plate 16, and is expanded by the number of steps of the stepping motor (not shown) of the first platen roller 11. When it is determined that the first clamper 3 has reached the opened first clamper 3, the first clamper 3 is closed by an opening / closing device (not shown).

The plate-making first master (not shown)
Is held between the first stage 4 and the first clamper 3, the first plate cylinder 1 moves in the direction of arrow B (clockwise) in the drawing at substantially the same speed as the feed speed of the first platen roller 11. The first master 2 starts to be rotated at the peripheral speed, and is wound around the outer peripheral surface of the first plate cylinder 1. As shown in FIG. 3, the winding state is such that the support 2a side of the plate-making master 2A is wound around the outer peripheral surface side of the first plate cylinder 1, and the film 2b side is wound around the outer peripheral surface of the first plate cylinder 1. Can be Then, when the number of steps of the stepping motor (not shown) reaches a predetermined number, the first cutters 14a and 14b operate to cut the rear end of the plate-making first master (not shown). At the same time,
The rotations of the first platen roller 11 and the first auxiliary roller 15 are stopped.

Next, when the second plate cylinder 20 is rotated by the drive of a motor (not shown) and the second clamper 22 comes to a position almost directly above in FIG. 1, the second plate cylinder 20 is stopped. When the second clamper 22 is opened by an opening / closing device (not shown), the second platen roller 30 starts to rotate, and the second master 21 is pulled out from the second master roll 32 and transported. Simultaneously with the transport of the second master 21, the second thermal head 31 is driven while the image information of the digital signal corresponding to the second plate cylinder 20 is read from a memory device (not shown), and the second master 21 is perforated. . The leading end of the prepressed second master (not shown) is fed by the second auxiliary roller 34 while being guided by the second guide plate 35, and is inserted into the expanded second clamper 22 with the film 21b facing down. Is done. When it is determined from the number of steps of a step motor (not shown) of the second platen roller 30 that the leading end of the plate-making second master (not shown) has reached, the second clamper 22 is closed by a clamper opening / closing device (not shown).

In FIGS. 1, 2 and 4, when the leading end of the prepressed second master (not shown) is clamped between the second stage 23 and the second clamper 22, the second plate cylinder 20 is moved. Starts rotating in the direction of arrow B (clockwise) in the drawing at a peripheral speed substantially equal to the feed speed of the second platen roller 30, and the second master (not shown) having finished making the plate is placed on the outer peripheral surface of the second plate cylinder 20. It is wound around. As shown in FIG. 4, the winding state is such that the film 21b side of the master 21A (shown in parentheses in FIG. 4) is placed on the outer peripheral surface side of the second plate cylinder 20.
It is wound around the outer peripheral surface of the second plate cylinder 20 with the support 21a side facing outward. And a stepping motor (not shown)
When the number of steps becomes a predetermined number, the second cutter 33a,
33b is operated, and the rear end of the plate-making second master (not shown) is cut off. At the same time, the rotations of the second platen roller 30 and the second auxiliary roller 34 are stopped. Thus, the plate making process of the second plate making section 110 is completed.

When the plate making of the first plate making section 100 and the second plate making section 110 is completed, a so-called plate making step and printing step are started. First, the paper feed table 39 is raised by a bottom plate raising means (not shown), and the paper 40
Is stopped at the position where it contacts. Next, the paper feed roller 41
Is rotated, and is fed toward the pair of registration rollers 43a, 43b while only one of the sheets 40 is separated by the separation roller 42. The conveyed paper (not shown) is set at a predetermined timing synchronized with the rotation of the first plate cylinder 1 by the pair of registration rollers 43a and 43b, and is moved between the first plate cylinder 1 and the first press roller 9. Is inserted into. At this time, the first sensor 4
4 detects one end of the fed sheet (not shown), the first press roller 9 separated from the outer peripheral surface of the first plate cylinder 1 is raised to a position indicated by a virtual line. Then, as shown in FIG. 3, the ink is opened by opening the first plate cylinder 1 by pressing the sheet 40 against the plate-making master 2A wound around the outer peripheral surface of the first plate cylinder 1 rotating in the direction of arrow B. Hole part 1h
Transfer ink I, which passes through the perforated portion 2h of the stencil master 2A while oozing out and extrudes onto the surface of the paper 40.
T is transferred to form a printed image. At this time, the first ink roller 6 also rotates in the same direction as the rotation direction of the first plate cylinder 1 to supply ink to the inner peripheral surface of the first plate cylinder 1.

In FIGS. 1 and 2, the printed paper 40
A is conveyed while being pressed by the first plate cylinder 1 and the press roller 9, is separated by the first peeling claw 10, and is sucked by the suction fan 48 by the transfer belt 47 and the second plate cylinder 20 and the second press roller 9. 28. When a printed sheet (not shown) is sent from the first plate cylinder 1 and one end thereof is detected by the second sensor 49, the second press roller 28 is raised to a position indicated by a virtual line, and is moved in the direction of arrow B. When the printed paper 40A is pressed against a plate-making master 21A (described with reference to FIG. 4 and shown in parentheses in FIG. 4) wound around the outer peripheral surface of the rotating second plate cylinder 20, ink is discharged to the second position. From the opening 20h of the two-plate cylinder 20 to the master 21A,
, Oozes through the perforated portion (not shown), and is extruded onto the surface of the printed paper 40A to transfer the ink to form a desired overprint image. At this time, referring to FIG. 4, the surplus transfer ink IT formed by the first plate cylinder 1 is absorbed by the support 21a of the plate-making master 2A and fed in the next printing step. Adsorbed ink IA that does not show off on incoming printed paper (not shown)
Becomes Therefore, the setting ink IS that can be dried instantaneously is formed at the position corresponding to the original transfer ink IT on the overprinted printed paper 40A. The printed paper (not shown) on which the overprinting is performed in this manner is applied to the second plate cylinder 2 by the second peeling claw 29.
0, and is discharged to the paper discharge tray 50,
The printing of the first sheet, the so-called printing, is completed, and the printer enters a print standby state. Next, a predetermined number of prints are sequentially and continuously performed by the same operation as the above operation.

By the way, according to the conventional stencil printing method, 2
If color or multicolor printing is performed in one pass, the excess transfer ink of the printed paper printed on the upstream plate cylinder adheres to the film surface wrapped around the downstream plate cylinder, and the subsequent printed paper When the ink is fed out of position, the transfer ink is re-transferred to the film surface, and a double image defect occurs. Therefore, according to the first embodiment, since the ink that transfers to the printed paper printed on the plate cylinder on the upstream side is absorbed by the support, retransfer does not occur, and even if multicolor printing is performed in one pass, double printing is performed. There is an advantage that a printed matter of a good image without an image or the like can be obtained.

The present invention is not limited to the first embodiment, but can be applied to a stencil printing method using a single cylinder type stencil printing apparatus. In this case, the plate-formed master may be wound on the outer peripheral surface of the plate cylinder with the thermoplastic resin film side on the outer peripheral surface side of the plate cylinder and the support side on the outer side (hereinafter, this will be referred to as “Example 2”). ). According to the second embodiment, there is an advantage that the amount of waste ink attached to the master and discarded at the time of plate discharging can be reduced. In addition, the portion where the ink adheres to the support is only the perforated portion of the image portion corresponding to the thermoplastic resin film, and the ink is filled in the entire portion corresponding to the opening region of the plate cylinder as in the conventional case. Therefore, there is an advantage that the swelling of the support due to the adhesion of the ink is very small, the change of the image size with respect to the original image is very small, and the original image can be reproduced more faithfully as a printed image. Also, because the thermoplastic resin film and the paper are in direct contact, or the thermoplastic resin film and the pressing means do not directly press and contact, the thermoplastic resin film does not peel off from the outer peripheral surface of the plate cylinder at all, There is also an advantage that printing durability is significantly improved.

FIG. 4 shows another embodiment 3. Example 3
Differs from Example 1 only in the following points. That is, when no plate-making instruction is issued to the second plate-making section 110 (shown in FIG. 1 and not shown) on the side of the second plate cylinder 20 as the downstream plate cylinder (for example, in the case of monochrome printing), After the film 21b of the unprinted master 21X is wound around the outer peripheral surface of the second plate cylinder 20 with the support 21a side facing the outer peripheral surface of the second plate cylinder 20, the unplated master 21X is interposed via the printed paper 40A. This is a stencil printing method in which the master 21X is pressed by the second press roller 28.

According to the third embodiment, the surplus transfer ink IT formed by the first plate cylinder 1 is adsorbed by the support 21a of the blank plate master 21X, and is fed in the printing process. Can be instantaneously dried at the position corresponding to the original transfer ink IT of the overprinted printed paper 40A because the ink IA does not cause show-through on the printed paper (not shown). Setting Ink I
S is formed. Therefore, according to the third embodiment, in the continuous printing of the paper, even if the printed papers are continuously stacked and stacked, the excess transfer ink is transferred to the back surface of the printed paper stacked on the upper stage. There is an advantage that show-through defects can be significantly reduced.

In the third embodiment, the thickness of the support 21a of the blank master 21X is about 30 μm.
Support 21a of unmade master 21X wound around
If the surplus transfer ink is continuously adsorbed in the same portion, the ink cannot be adsorbed at last. Therefore, FIG.
As shown in the figure, the second plate cylinder 20 as the downstream plate cylinder and the first plate cylinder 1 as the most upstream plate cylinder are connected by top and bottom moving means 600 for biasing the printing position on the printed sheet. In printing, the top and bottom moving means 600 may be operated to gradually move the phase of the outer peripheral surface of the second plate cylinder 20 in the rotation direction with respect to the phase of the first plate cylinder 1. (Hereinafter, this is referred to as “Example 4”).

In FIG. 5, a vertical moving means 600 is fixed to one end surface of the first plate cylinder 1 and transmits the rotational driving force of the first plate cylinder 1 to a second end plate pulley 20P (described later). An end plate pulley 1P, a second end plate pulley 20P fixed to one end surface of the second plate cylinder 20 and transmitting the rotational driving force of the first plate cylinder 1 via a belt 51 (described later); End plate pulley 1P
Arm 52 movably provided between the first and second end plate pulleys 20P, and a pinion (not shown) rotatably supported by a side plate (not shown) of the stencil printing machine AB and driven by a drive motor (not shown). And a rack 57 formed at one end of the slider arm 52 that meshes with a pinion (not shown), and are rotatably mounted via shafts 52s fixed to the upper and lower ends of the slider arm 52. A pair of movable upper pulley 54, movable lower pulley 55, and four fixed members which are rotatably mounted on a shaft 56s planted on a side plate (not shown) of the stencil printing machine AB and which are provided vertically above and below the slider arm 52. Pulleys 56a, 56
b, 56c, 56d, the first end plate pulley 1P, the second end plate pulley 20P, the moving upper pulley 54, the lower moving pulley 55, and the belt 51 wrapped around the four fixed pulleys 56a, 56b, 56c, 56d. Mainly composed of In addition,
The slider arm 52 is formed with two long holes 52h. The slider arm 52 is slidably supported via a pair of support pins 53p implanted on a side plate (not shown) of the stencil printing machine AB. Is supported by a guide member (not shown) fixed to the slidable up and down.

Next, the operation of the fourth embodiment will be described. FIG.
, The pinion (not shown) is rotated and the rack 57 is moved in the direction of the arrow U (upward in the figure), so that the slider arm 52 and the movable upper pulley 54 are moved.
The moving lower pulley 55 is also displaced in the direction of arrow U via the belt 51. Therefore, the first plate cylinder 1 and the second plate cylinder 1
The plate cylinder 20 is deviated from the original phase state in the rotation directions indicated by a and b, respectively. Contrary to the above operation, when the rack 57 is moved in the direction of arrow D (downward in the figure), the first plate cylinder 1 and the second plate cylinder 20 move in directions opposite to the rotation directions indicated by a and b, respectively. It will be deviated from the original phase state.

According to the fourth embodiment, in addition to the advantages of the third embodiment, there is an advantage that the show-through preventing effect can be maintained for a long time. Not only the position adjusting mechanism of the vertical moving means but also a mechanism for gradually sliding not only in the rotation direction of the plate cylinder but also in the length direction of the rotation center axis of the plate cylinder is desirable.

The state in which the prepress command is not issued in the third embodiment is not limited to the third embodiment. Until the prepress command is issued, the winding of the unmastered master 21X may be continued as it is (hereinafter referred to as "execute"). Example 5 ").

According to the fifth embodiment, it is not necessary to replace the master for each plate making. Therefore, when plate making is unnecessary, there is an advantage that the master can be prevented from being wasted by cutting the plate making. .

The vertical moving means is not limited to the one in the fourth embodiment, but is constituted by a phase variable means such as a vertical position adjusting mechanism 21 using a planetary gear described in Japanese Patent Laid-Open No. 4-329175. May be.

The master to be wound around the outer peripheral surface of the first plate cylinder 1 as the uppermost plate cylinder of the double-cylinder type stencil printing machine is composed of a conventional thermoplastic resin film and a porous resin as in the first embodiment. Not only a roll-shaped master made of a flexible support but also a master made of substantially a thermoplastic resin film can be used. The master substantially consisting of only the thermoplastic resin film means, in addition to the master consisting of only the thermoplastic resin film, the master containing a trace component such as an antistatic agent in the thermoplastic resin film,
Further, it includes one or more thin film layers such as an overcoat layer formed on both main surfaces of the thermoplastic resin film, that is, at least one of the front surface and the back surface.

[0063]

As described above, according to the first aspect of the present invention, at least two plate cylinders are provided, and
On the outer peripheral surface of the uppermost plate cylinder located upstream,
The thermoplastic resin on the outer peripheral surface side of the uppermost plate cylinder
Winding with the film side outward, the outer peripheral surface of the downstream plate cylinder
The downstream side is the thermoplastic resin film side of the master
By performing printing with come wound by the support side to the outer side on the outer peripheral surface of the plate cylinder, the printed printed with the plate cylinder of the upstream-side
As the excess ink on the paper is absorbed by the support,
Does not occur, and double-color images etc. are generated even if multi-color printing with one pass
It is possible to obtain a printed matter of a good image which is not produced .

According to the second aspect of the present invention, when a plate making command is not issued to the plate making section of the downstream plate cylinder, the outer periphery of the downstream plate cylinder is output.
Surface, the thermoplastic resin film side of the blank master is downstream
After winding around the outer circumference of the plate cylinder with the support side facing out
Press the blank master with the pressing means via the printed paper.
Pressure, so that the printed paper is
The upper stack is generated when stacking
Excess transfer ink transfers to the back side of the printed printed paper
It is possible to prevent show-through.

According to the third aspect of the present invention, a downstream plate cylinder is provided.
Is used to shift the printing position with respect to the printed paper.
It is connected to the uppermost plate cylinder by means of vertical and
Since the top and bottom moving means is operated,
The show-through prevention effect in light can be maintained for a long time .

According to the fourth aspect of the present invention, the plate making instruction is
Until it comes out, continue winding the blank master
By doing so, in addition to the effects of the invention described in claim 2,
Since it is not necessary to replace the master for each plate,
In case, the master is wasted by cutting the plate
Can be prevented .

According to the fifth aspect of the present invention, the most upstream version
The cylinder and the downstream plate cylinder are connected by a driving force transmission mechanism,
Set the phase of the rotation direction of the downstream plate cylinder to the rotation direction of the uppermost plate cylinder.
To the printed paper
A vertical moving means for biasing the printing position with respect to the
If no prepress command is issued to the prepress section of the plate cylinder,
The thermoplastic resin film side of the star is the outer peripheral surface side of the downstream plate cylinder.
Then, after winding with the support side outside, printing is performed,
At the time of this printing, the top and bottom moving means is activated and the printed
The blank master is pressed by the pressing means via the paper
In the continuous printing of paper, the printed paper
Occurs when loaded by being overturned
Excess transfer ink is transferred to the back of the printed paper.
The show-through can be prevented for a long time .

[0068]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a double-cylinder stencil printing apparatus to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged sectional view of a main part showing a printing operation in a downstream plate cylinder of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing a printing operation in the uppermost upstream plate cylinder of FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part showing a printing operation on a downstream plate cylinder when another embodiment is applied.

FIG. 5 is a perspective view showing a configuration around a vertical moving means when another embodiment of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st plate cylinder 2 1st master 2a 1st master support 2A Plated 1st master 2b 1st thermoplastic resin film 5 1st rotation center axis 9 1st press roller as 1st press means 11th 1 Platen Roller 12 First Thermal Head 13 First Master Storage Unit 20 Second Plate Cylinder 21 Second Master 21a Second Master Support 21A Plated Second Master 21b Thermoplastic Resin Film of Second Master 21X Unprinted Second Master 24 second rotation center shaft 28 second press roller 30 as second pressing means 30 second platen roller 31 second thermal head 32 second master storage means 80, 90 first, second ink supply means 85, 95 first , Second clamping means 100, 110 first and second plate making sections 200, 210 first, second printing section 300, 310 first, second discharging section Part 600 heaven and earth movement means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41L 13/14 B41L 13/04 B41L 13/18 B41C 1/055 511

Claims (5)

(57) [Claims] 1. Master storage means for storing a master comprising a thermoplastic resin film and a porous flexible support, plate making means for making the master based on image information, and cutting for cutting the master Means for printing, a plate cylinder around which the master is wound around an outer peripheral surface and which rotates around a rotation center axis, ink supply means for supplying ink to an inner peripheral surface of the plate cylinder, A printing unit provided with a clamping unit for holding the leading end of the master, a pressing unit for pressing the printing paper against the outer peripheral surface, and a plate discharging unit for separating and discharging the used master from the outer peripheral surface. Stencil printing method using a stencil printing apparatus having at least two plate cylinders described above , and an outer peripheral surface of a top-most stencil cylinder located at the most upstream position in the paper transport path.
Then, the support side of the prepressed master is
With the thermoplastic resin film side outside on the outer peripheral surface side of
Wound on the outer peripheral surface of the downstream position plate cylinder located on the downstream side, the thermoplastic resin film side of the stencil master and the upper Symbol support side outside the outer <br/> peripheral surface side of the downstream position plate cylinder stencil printing wherein the printing is performed with come up. 2. A thermoplastic resin film and a porous flexible support.
A master storage means for storing a master comprising
Plate making means for making the master based on image information;
A stencil making unit having a cutting means for cutting the master; and
A rotating plate cylinder and an ink supply unit for supplying ink to an inner peripheral surface of the plate cylinder;
Ink supply means and the master provided on the outer peripheral surface.
Clamping means for clamping the tip and for printing on the outer peripheral surface
A printing unit including a pressing unit that presses a sheet of paper, and a plate discharge unit that separates and discharges a used master from the outer peripheral surface.
Stencil printing method using stencil printing apparatus having stencil
Te, having at least two said plate cylinder, except for the most upstream position plate cylinder located most upstream of the sheet conveying path, the outer peripheral surface of the downstream position plate cylinder located on the downstream side, the heat of the stencil master A stencil printing method in which the plastic resin film side is wound around the outer peripheral surface side of the downstream plate cylinder with the support side facing outward to perform printing.
And no prepress command is issued to the prepress section of the downstream plate cylinder
Is placed on the outer peripheral surface of the downstream plate cylinder.
Put the plastic resin film side up on the outer peripheral side of the downstream plate cylinder.
After winding with the support side facing out, the printed paper
Hole plate printing method the non-plate-making master you, characterized in that the pressing by the pressing means through. 3. The printing press according to claim 1, wherein said downstream plate cylinder is adapted to face said printed paper.
The top and bottom moving means to shift the printing position
It is connected to the upstream plate cylinder, and moves up and down when printing.
3. A stencil printing method according to claim 2, wherein said means is operated . 4. Until the plate making command is issued, the unprinted plate making machine is not used.
3. The stencil printing method according to claim 2 , wherein the winding of the star is continued . 5. A thermoplastic resin film and a porous flexible support.
A master storage means for storing a master comprising
Plate making means for making the master based on image information;
A stencil making unit having a cutting means for cutting the master; and
A rotating plate cylinder and an ink supply unit for supplying ink to an inner peripheral surface of the plate cylinder;
Ink supply means and the master provided on the outer peripheral surface.
Clamping means for clamping the tip and for printing on the outer peripheral surface
A printing unit including a pressing unit that presses a sheet of paper, and a plate discharge unit that separates and discharges a used master from the outer peripheral surface.
Stencil printing machine having at least two stencils arranged along a paper transport path
These plate cylinders have the uppermost stream of the paper transport path.
Located on the uppermost plate cylinder and above this uppermost plate cylinder
And a downstream plate cylinder located downstream of the paper transport path.
And the driving force transmission between the uppermost printing cylinder and the lower printing cylinder.
And the phase of the rotation of the downstream plate cylinder in the rotation direction of the uppermost plate cylinder is
By biased with respect to the rotation direction of the phase, the sign
Top and bottom moving means for shifting the printing position with respect to the printed paper
A has, in the case of plate-making instruction in the plate-making portion of the downstream position plate cylinder does not come out
The above-mentioned thermoplastic resin film side of the blank master
Wrap the outer peripheral surface of the downstream plate cylinder with the support
After printing, print at the time of this printing.
Means is activated and the unprinted
The plate master is pressed by the pressing means.
Stencil printing machine.