JPH1158913A - Screen printing method, screen printing machine and master winding apparatus of screen printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable perfecting printing by providing two plate cylinders and a transfer cylinder, to make the master wound around two plate cylinders in one plate making part and to remove the used master on two plate cylinders by one plate discharge part. SOLUTION: The master 4 made in a plate making part 5 is wound around a first plate cylinder 1 and transferred to a second plate cylinder 2 through the first plate cylinder and a transfer cylinder 3 at the time of perfecting printing to be wound therearound and the image of the master 4 on the second plate cylinder 2 is transferred to the transfer cylinder 3 and paper P is held between the first plate cylinder 1 and the transfer cylinder 3 to be fed. In this process, the image of the master 4 on the first plate cylinder 1 is transferred to the surface of the paper P and the transferred image on the transfer cylinder 2 is transferred to the rear surface of the paper P. The used master 4 is peeled on the outer peripheral surface of the second plate cylinder 2 by a plate discharge part 35 to be removed. Even if two plate cylinders 1, 2 are used for the purpose of perfecting printing and the plate making part 5 and the plate discharge part 35 may be provided one by one.

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, a stencil printing apparatus, and a master winding apparatus for the stencil printing apparatus.

[0002]

2. Description of the Related Art Conventionally, as described in JP-A-8-118774, first and second plate cylinders on which respective masters are wound are interposed between transfer cylinders disposed therebetween. Arranged, the second plate cylinder is brought into contact with the transfer cylinder, and the second plate cylinder and the transfer cylinder are rotated in directions opposite to each other, thereby seeping out from the inside of the second plate cylinder via the master. After the transferred ink is transferred to the outer periphery of the transfer cylinder, a sheet is fed between the first plate cylinder and the transfer cylinder, and the first plate cylinder and the transfer cylinder are aligned with the timing of the paper feeding. By rotating the ink in the opposite directions to each other, the ink oozed from the inside of the first plate cylinder via the master is transferred to the front surface of the paper, and the transfer image on the transfer cylinder is transferred to the back surface of the paper. There is a stencil printer. In this case, the ink transferred to the back surface of the paper is pressed against the surface of the hard transfer cylinder and penetrates into the paper, so that the ink layer on the back surface of the paper is thin without rising. Accordingly, even if the image on the back side of the sheet is immediately stacked on the sheet printed before the sheet, the image on the back side is not rubbed by the sheet on the lower side and is not stained.

[0003]

In such a stencil printing apparatus, double-sided printing can be performed at a time in the process of feeding paper in one direction. Moreover, since the ink layer of the transferred image on the transfer cylinder is thinner than the ink layer oozing out of the plate cylinder, it can be dried in a short time. Therefore, in the case where the printed sheets are sequentially discharged to the discharge tray in a stacked state, the discharged image is stacked on the paper on the discharge tray so that the transfer image from the transfer cylinder is on the lower surface, and discharged. It is also possible to obtain the effect that the ink on the paper immediately after printing does not adhere to the surface of the paper discharged before.

However, each of the first and second plate cylinders has a structure for receiving a master discharged from the plate discharge section in synchronization with the plate making operation of the plate making section, and thus requires a plurality of plate making sections. Also, conventionally, the used master on the plate cylinder is peeled off and removed by the plate discharging unit. However, since the plate discharging unit must be prepared for each number of plate cylinders, the number of parts increases, and the cost increases. There is a problem that becomes high.

[0005]

According to a first aspect of the present invention, there is provided a stencil printing method comprising: synchronizing first and second plate cylinders and transfer cylinders each having an openable and closable clamper for holding one end of a master on the outer periphery; The master is sequentially wound around the first plate cylinder, the transfer cylinder, and the second plate cylinder by rotating each of the clampers and opening and closing in a timely manner to rotate the clampers on the second plate cylinder. Holding the other master, on which the image is made by the plate making unit, is wound around the outer periphery of the first plate cylinder while rotating the first plate cylinder, and the second plate cylinder and the transfer cylinder are opposed to each other. While rotating in the direction, the ink oozed out from the inside of the second plate cylinder via the master is transferred to the transfer cylinder, and the first plate cylinder and the transfer cylinder are rotated in opposite directions to each other. While feeding paper between them, The ink exuded from the inside of the first plate cylinder via the master is transferred to one surface of the sheet and the transfer image on the transfer cylinder is transferred to the other surface of the sheet. .

Accordingly, it is possible to wind the master wound around the second plate cylinder around the second plate cylinder via the first plate cylinder and the transfer cylinder. This makes it possible to make two masters for the second plate cylinder and the first plate cylinder by the same plate making unit.

According to a second aspect of the present invention, in the stencil printing method, the master on which the image is formed is wound around first and second plate cylinders each having an openable and closable clamper for holding one end of the master. While rotating the plate cylinder and the transfer cylinder having a clamper on the outer periphery in opposite directions, the ink that has oozed out from the inside of the second plate cylinder via the master is transferred to the transfer cylinder, A sheet is fed between the one plate cylinder and the transfer cylinder while rotating them in directions opposite to each other, and the ink oozed out from the inside of the first plate cylinder via the master is applied to the paper. After transferring to one surface and transferring the transfer image on the transfer cylinder to the other surface of the paper, and removing the master wound around the second plate cylinder by a plate discharging unit, the first and second The second plate cylinder and the transfer cylinder are rotated in synchronization with each other. After the master wound around the first plate cylinder is wound around the second plate cylinder via the transfer cylinder by opening and closing the respective clampers in a timely manner, the second plate The master on the cylinder is removed by the plate discharging unit.

Therefore, after the master on the second plate cylinder is removed by the plate discharging section, the master on the first plate cylinder can be wound on the second plate cylinder via the transfer cylinder. Because there is
The master for the first plate cylinder and the master for the second plate cylinder can be removed from the same plate discharging section.

A stencil printing apparatus according to a third aspect of the present invention includes a transfer cylinder having an openable and closable clamper on the outer periphery for holding the end of the master, and an openable and closable clamper for holding the end of the master on the outer periphery. First and second plate cylinders for bleeding ink from the inside, drum motors for driving the first and second plate cylinders and the transfer cylinder, and transferring the first and second plate cylinders to the transfer cylinder An advancing / retracting drive unit that relatively moves toward and away from the cylinder, and a rotation operation of the first plate cylinder and a rotation of the first plate cylinder so that a master made by the plate making unit is wound around the first plate cylinder. First winding operation control means for controlling the opening and closing operation of the clamper, and the second winding operation control means for sequentially winding the master wound around the first plate cylinder around the outer periphery of the transfer cylinder and the second plate cylinder. Rotational operation of one plate cylinder, the transfer cylinder, and the second plate cylinder Second winding operation control means for controlling opening and closing operations of the clampers of the first and second plate cylinders and the transfer cylinder; and feeding a sheet between the first plate cylinder and the transfer cylinder. A paper feed unit, and the second plate cylinder on which the master is wound is brought into contact with the transfer cylinder by the advance / retreat drive unit, and the second plate cylinder and the transfer cylinder are rotated in opposite directions. Then, the ink oozed from the inside of the second plate cylinder through the master is transferred to the transfer cylinder,
In synchronization with the sheet feeding operation of the sheet feeding unit, the first plate cylinder on which the master is wound is brought into contact with the transfer cylinder by the advance / retreat drive unit, and the master is fed from inside the first plate cylinder. The movement of the advancing / retracting drive unit and the drum motor is performed so that the ink exuded through the transfer unit is transferred to one surface of the paper and the transfer image on the transfer cylinder is transferred to the other surface of the paper. A printing operation control unit for controlling the printing operation; and a plate discharging unit for removing the master on the second plate cylinder.

Therefore, the master made by the plate making section is wound around the first plate cylinder by the first winding operation control means. The master wound around the first plate cylinder is wound around the second plate cylinder via the transfer cylinder by the second winding operation control means. After the master is wound around the first and second plate cylinders in this way, the second plate cylinder is brought into contact with the transfer cylinder by the advance / retreat drive unit under the control of the printing operation control means, And the transfer cylinder are rotated in opposite directions to transfer the ink oozed from the inside of the second plate cylinder via the master to the transfer cylinder, and the first ink is synchronized with the sheet feeding operation of the sheet feeding unit. The plate cylinder and the transfer cylinder are brought into contact with each other and rotated to transfer the ink oozed out from the inside of the first plate cylinder via the master onto one surface of the paper, and to transfer the image on the transfer cylinder. Is transferred to the other side of the sheet, so that printing is performed on both sides of the sheet in a single sheet feeding process. The used master on the second plate cylinder is removed by the plate discharging unit, and the used master on the first plate cylinder is wound around the second plate cylinder by the second winding operation control means as described above. Therefore, it is removed by the plate discharging portion on the outer periphery of the second plate cylinder.

The stencil printing apparatus according to the fourth aspect is the third aspect of the invention.
In the described invention, the advance / retreat drive unit is configured to move the first and second plate cylinders toward and away from the transfer cylinder whose axis is set at a fixed position.

Therefore, the first and second plate cylinders can be independently moved toward and away from the transfer cylinder rotating at a fixed position. This makes it possible to maintain the paper transport path at a constant position on the outer peripheral surface of the transfer cylinder.

The stencil printing apparatus according to the fifth aspect is the third aspect of the present invention.
Alternatively, in the invention according to the fourth aspect, there is provided a blower fan for pressing an end of the master toward the inner surface of the opened clamper by wind pressure.

Therefore, when the master is wrapped around from the first plate cylinder to the transfer cylinder or from the transfer cylinder to the second plate cylinder, the transfer of the master from the previous cylinder to the clamper of the next cylinder is ensured. Can be performed.

According to a sixth aspect of the present invention, a master winding device for a stencil printing apparatus includes a transfer cylinder having an openable and closable clamper for holding an end of a master and an openable and closable clamper for holding an end of the master. The first and second plate cylinders that have the bleeding ink from the inside, and a drum motor that drives the first and second plate cylinders and the transfer cylinder,
First winding operation control means for controlling a rotation operation of the first plate cylinder and an opening / closing operation of a clamper of the first plate cylinder so as to wind a master made by the plate making unit around the first plate cylinder; The first plate cylinder, the transfer cylinder, and the second plate cylinder so that the master wound around the first plate cylinder is sequentially wound around the outer circumference of the transfer cylinder and the second plate cylinder. And a second winding operation control means for controlling the opening and closing operations of the first and second plate cylinders and the clampers of the transfer cylinder.

Therefore, the master made by the plate making section is wound around the first plate cylinder by the first winding operation control means. The master wound around the first plate cylinder is wound around the second plate cylinder via the transfer cylinder by the second winding operation control means.

[0017]

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a first plate cylinder 1, a second plate cylinder 2, and a transfer cylinder 3 are rotatably provided with parallel axes. In the vicinity of the first plate cylinder 1, a master 4
A plate making unit 5 is provided for making a plate by heating and perforating the plate and transporting the plate toward the first plate cylinder 1. A guide plate 6 for guiding the paper P is provided between the first plate cylinder 1 and the transfer cylinder 3, and a paper feed unit 7 is provided upstream (left side) of the guide plate 6.
The paper feed unit 7 is a separation paper feed roller (not shown) that separates and feeds the paper P in a paper feed tray (not shown) one by one.
And a pair of registration rollers 8 that convey the sheet P fed from the separation sheet feed roller in time with the advance of the master 4 wound around the first plate cylinder 1. A sensor S for optically detecting the leading end of the sheet P is provided near the downstream side of the registration roller 8. On the downstream side (right side) of the guide plate 6, a belt conveyor 10 that conveys the paper P fed from the registration rollers 8 toward the discharge tray 9 is slightly lower than a tangent line at the top dead center of the transfer cylinder 3. It is arranged and provided at the level. Inside the belt conveyor 10, a suction unit 11 for sucking the paper P is provided. Reference numeral 12 denotes a separation claw that separates the printed sheet P from the first plate cylinder 1.

The plate-making section 5 includes a platen 13 that is driven to rotate along a transport path of the master 4, a thermal head 14 that is supported to be able to contact and separate from the platen 13, a cutter 15 that cuts the master 4, A pair of transport rollers 16,
It is formed by sequentially disposing guide plates 17 and the like for guiding the master 4 to the outer periphery of the first plate cylinder 1. The roll core 4a, the platen 13, the transport roller 16 and the like of the master 4 are rotatably supported on a side plate (not shown) of a main body case of the stencil printing apparatus.

Next, the configuration of the first and second plate cylinders 1 and 2 will be described. Since the configuration of the first and second plate cylinders 1 and 2 is basically the same, the same portions will be described using the same reference numerals. The first and second plate cylinders 1 and 2 have a non-opening 1
8 and an opening 19 are formed. The opening 19 is provided with a mesh screen formed of a resin or metal net. Each of these plate cylinders 1 and 2 has a flange (not shown) fixed to both ends thereof having an ink pipe 20.
It is supported rotatably. Further, inside the plate cylinders 1 and 2, there is provided an ink roller 21 which is in contact with the inner peripheral surface of the plate cylinders 1 and 2.
And the doctor roller 22 are rotatably provided with a slight gap. A wedge-shaped space between the ink roller 21 and the doctor roller 22 of the first plate cylinder 1 forms an ink reservoir 24 that receives ink dripped from a supply hole 23 formed at a lower end of the ink pipe 20. The wedge-shaped space between the ink roller 21 and the doctor roller 22 of the second plate cylinder 2 also forms an ink reservoir 24. Since the ink reservoir 24 is located above the ink pipe 20, a thin pipe 25 is provided. To supply the ink in the ink pipe 20 to the ink reservoir 24. The ink pipe 20 is configured to be supplied with ink from an ink pack (not shown) provided outside the plate cylinders 1 and 2.

A stage 26 and a clamper 27 for holding the leading end of the master 4 at the non-opening portion 18 are mounted on the outer peripheral surfaces of the plate cylinders 1 and 2. Stage 26
Is formed of a magnetic material and has a length along the axial direction of the plate cylinders 1 and 2. The clamper 27 is rotatably supported with a clamper shaft 28 disposed along the longitudinal direction of the stage 26 as a support shaft. On the outer circumference of the transfer cylinder 3,
A notch 29 for preventing interference with the second clamper 27 is formed, and a stage 26 (see FIG. 3) and a clamper 27 that rotates around a clamper shaft 28 are also provided at one edge of the notch 29 in the rotation direction. Is provided.

Further, the transfer cylinder 3 is rotatably supported at a fixed position by a support shaft 30 rotatably supported on opposing side plates. A cleaner unit 31 is provided near the outer circumference of the transfer cylinder 3. The cleaner unit 31 includes a cleaner tank 32 storing a cleaner liquid for dissolving ink, a cleaner supply roller 33 immersed in the cleaner liquid of the cleaner tank 32, and a cleaner liquid supplied from the cleaner supply roller 33. Roller 3 for wiping ink adhered to transfer cylinder 3 by
4.

Further, on the outer periphery of the second plate cylinder 2, there is provided a plate discharging portion 35 for peeling and removing the used master 4 wound around the outer periphery. Since the plate discharging portion 35 has a known structure, only its outline will be described.
Has a pair of belts in contact with each other.
These belts rotate around a roller on the driving side thereof, and pinch a master on the second plate cylinder 2 at an end on a free end side. It is configured to be discarded in the provided storage unit.

Next, the first and second plate cylinders 1 and 2 are transferred to the transfer cylinder 3
FIG.
A description will be given based on FIG. These forward / backward drive units 3
Since the structures and operating principles of 7, 38 are basically the same, parts having the same functions will be described using the same reference numerals.
As shown in FIG. 2, a pair of arms 40 that rotate about a fulcrum shaft 39 are provided on opposing side plates of the stencil printing apparatus. Although the arms on the near side are omitted in the drawing, these paired arms 40 are urged downward by a spring 41 and are connected by a connecting rod (not shown) so as to rotate in conjunction with each other. Ink pipe 2
0 are fixedly supported at both ends. A cam follower 42 is rotatably provided on one arm 40, and a cam 43 for supporting the cam follower 42 is rotatably connected to a cam motor described later. And arm 4
Arm stopper 44 locked at the free end of the fulcrum shaft 4
5 so as to be swingable.
, The tip of the plunger 48 of the solenoid 46 is rotatably connected. The plunger 48 is urged by a spring 49 in the direction in which it extends.

That is, the forward / backward drive section 37 attracts the plunger 48 by exciting the solenoid 46, rotates the arm stopper 44 counterclockwise about the fulcrum shaft 45, removes the arm stopper 44 from the arm 40, and releases the spring 41. By rotating the arm 40 clockwise by the urging force to bring the cam follower 42 into contact with the portion of the cam 43 having a small radius, the first plate cylinder 1 is lowered to contact the transfer cylinder 3,
The arm 43 is rotated counterclockwise by rotating the cam 43 halfway and pushing up the cam follower 42 against the urging force of the spring 41 at a portion where the radius is large, thereby turning the solenoid 46 off and setting the spring 49 The arm stopper 44 is returned clockwise by the plunger 48 which is extended by the force and locked to the free end of the arm 40, so that the first plate cylinder 1 is maintained in a state of being separated from the transfer cylinder 3. ing.

The other advance / retreat drive unit 38 shown in FIG.
An arm 40 is rotatably supported by a fulcrum shaft 39 disposed between the ink pipe 20 and the cam follower 42, using a solenoid 47 instead of the solenoid 46. The reason for changing the position of the fulcrum shaft 39 is that when the arm 40 is rotated clockwise by the urging force of the spring 41, the second plate cylinder 2 is raised together with the ink pipe 20 and brought into contact with the transfer cylinder 3. That's why. Another configuration is the forward / backward drive unit 37.
Since the configuration is completely the same, the description is omitted.

Next, FIG. 4 shows the electrical configuration. CPU5
0, a ROM 51 in which fixed data such as a program executed by the CPU 50 is written, a RAM 52 in which variable data such as work data is temporarily written, an I / O
The port 53 is connected by a system bus 54. The CPU 50 includes a sensor S described above, a master feed motor 55 for driving the platen 13 and the transport roller 16 of the plate making section 5, a sheet feed motor 56 for driving the paper feed section 7, the belt conveyor 10, and the like. A drum motor 57 for driving the transfer drum 2 and the transfer cylinder 3; a solenoid 46 for the forward / backward drive unit 37; a cam motor 58 for driving the cam 43 of the forward / backward drive unit 37;
A cam motor 5 for driving the cam 43 of the forward / backward drive unit 38
9, a blower fan 60, and a plate discharge roller motor 61 for driving the plate discharge roller of the plate discharge unit 35 are connected. As shown in FIG. 11, the blower fan 60 is disposed above the second plate cylinder 2 so as to blow air toward the outer circumference of the second plate cylinder 2 and the transfer cylinder 3.

The first plate cylinder 1, the second plate cylinder 2, and the transfer cylinder 3 may be driven by independently provided drum motors or by a common drum motor. In the case of driving using a common drum motor, the rotation of the motor is transmitted to the first and second plate cylinders 1 and 2 and the transfer cylinder 3 via the respective clutches so that they can be independently driven. Can be driven. In the present embodiment, one drum motor 57 is shown in FIG. 4, but this will be described on the assumption that the drum motor 57 is provided for each of the first and second plate cylinders 1 and 2 and the transfer cylinder 3. .

Here, the positions of the first and second plate cylinders 1 and 2 and the transfer cylinder 3 in the rotational direction are recognized by position detecting means (not shown) which is generally used. This position detecting means forms a detected portion on the first and second plate cylinders 1 and 2 and the transfer cylinder 3 or a rotating member that rotates simultaneously with one of them, and detects the detected portion by a sensor. It can be realized by the method. Hereinafter, the first and second plate cylinders 1 and 2 and the transfer cylinder 3 are rotated by a pulse input to the drum motor 57 in a desired direction at a desired angle based on the position detected by the above-described position detecting means. It will be described as an example.

Next, the operation will be described. When the previous printing operation has been completed, the master 4 is kept wound around the first and second plate cylinders 1 and 2 to dry the ink around the plate cylinders 1 and 2 and adhere foreign matter. To prevent
For this reason, when the power is turned on for the current printing, as shown in FIG. 14, the plate discharging process (S1-1) is executed first, followed by the plate making process (S1-2) and the printing process (S1).
-3) is executed.

Next, the plate discharging process will be described with reference to FIGS. For convenience of explanation, FIGS.
, The position of the end of the master 4 in the transport direction is indicated by a white circle, and the position of the end on the opposite side is indicated by a black circle. At the end of the previous printing, since the second plate cylinder 2 is stopped at a predetermined position, the drum motor 57 is driven by a predetermined pulse on the basis of this position to rotate the second plate cylinder 2 (S2-1). ). It is determined that the second plate cylinder 2 has been driven by a predetermined pulse (S2-
2) Then, the second plate cylinder 2 is stopped (S2-3).
In this state, the rear end of the master 4 on the second plate cylinder 2 faces the plate discharge unit 35.

Subsequently, the plate discharge unit 35 is driven (S2-
4). Thereby, the master 4 on the second plate cylinder 2 is peeled and removed by the plate discharging unit 35. At this time, the second plate cylinder 2 is rotated at the same speed as that of the master 4 by an amount corresponding to the separation of the master 4 so as not to hinder the peeling removal operation of the master 4.
Is determined to have been rotated by a predetermined pulse (S2
-5), the second plate cylinder 2 is stopped at a fixed position (S2
-6) and stop the plate discharging section 35.

Subsequently, the transfer cylinder 3 is rotated (S2-7), and when it is determined that the rotation has been performed by a predetermined pulse (S2-8), the transfer cylinder 3 is stopped (S2-9). The stop position of the transfer cylinder 3 at this time is the position shown in FIG. When the first plate cylinder 1 is rotated (S2-10) and it is determined that the pulse has been rotated by a predetermined pulse (S2-11), the first plate cylinder 1 is stopped and the clamper of the transfer cylinder 3 is stopped. 27 is released (S2-12). The stop position of the first plate cylinder 1 at this time is the position shown in FIG. Subsequently, in step S2-13, the clamper 27 of the transfer cylinder 3 is closed, and the clamper 27 of the first plate cylinder 1 is opened, and as shown in FIG. When it is determined that the first printing cylinder 1 and the transfer cylinder 3 have been rotated in the direction opposite to the printing direction and rotated by a predetermined pulse (S2-14).
Is stopped (S2-15). Thereby, as shown in FIG. 9, the used master 4 on the first plate cylinder 1 can be peeled off from the outer periphery of the first plate cylinder 1 and wound around the transfer cylinder 3. Subsequently, step S2-16
In FIG. 10, the clamper 27 of the second plate cylinder 2 is opened, and the blower fan 60 (see FIG. 11) is driven while rotating the transfer cylinder 3 clockwise by a predetermined number of pulses, as shown in FIG. The clamper 27 of the plate cylinder 2 is closed.

Then, as shown in FIG. 12, the second plate cylinder 2 is rotated counterclockwise (S2-17), and when it is determined that the second plate cylinder 2 has been rotated a predetermined number of pulses (S2-18), Is stopped (S2-19). The stop position at this time is a position where the rear end of the master 4 faces the plate discharge unit 35. As a result, as shown in FIG.
The used master 4 above can be wound around the second plate cylinder 2 via the transfer cylinder 3. In the process of the rewinding, the master 4 is in close contact with the first plate cylinder 1 on the base side, and the master cylinder 4 is in close contact with the transfer cylinder 3 on the slippery film side due to the adhesion of the ink. When the master 4 is wound around the second plate cylinder 2, even if the transfer cylinder 3 is stopped and only the second plate cylinder 2 is rotated, the master 4 is wound from the transfer cylinder 3 onto the second plate cylinder 2. be able to.

Here, steps S2-7 to S2-19
The first plate cylinder 1 and the transfer cylinder 3 and the second plate cylinder are arranged so that the master 4 wound around the first plate cylinder 1 is sequentially wound around the outer circumference of the transfer cylinder 3 and the second plate cylinder 2. This corresponds to a second winding operation control unit that controls the rotation operation of the cylinder 2 and the opening and closing operation of the clampers 27 of the first and second plate cylinders 1 and 2 and the transfer cylinder 3.

Since the second plate cylinder 2 has already stopped at the fixed position where the rear end of the master 4 on the second plate cylinder 2 faces the plate discharge unit 35, the plate discharge unit 35 is driven (S2). -20)
Thereby, the master 4 on the second plate cylinder 2 is peeled and removed by the plate discharging unit 35. At this time, the second plate cylinder 2 is rotated at a speed substantially equal to the speed of the master 4 by an amount corresponding to the separation of the master 4 so as not to hinder the peeling removal operation of the master 4, and the second plate cylinder is rotated by a predetermined pulse. Judgment (S2-2)
When 1) is performed, the second plate cylinder 2 is stopped at the fixed position and the plate discharging unit 35 is stopped (S2-22).

Next, the plate making process will be described with reference to the flowchart shown in FIG. In the present embodiment, when double-sided printing is specified, the master making section 5 makes the master 4 first using the data to be printed on the back side of the paper P,
The master 4 is made with the data to be printed on the surface of the master. In this case, the master 4 to be made first is for the second plate cylinder 2 and the master 4 to be made later is for the first plate cylinder 1. When single-sided printing is designated, the master 4 for the first plate cylinder 1 is always recognized as data to be printed on the front side of the sheet P, and plate making is performed.

In the plate making process, first, the first plate cylinder 1 is rotated (S3-1), and when it is determined that the first plate cylinder 1 has been rotated by a predetermined pulse (S3-2), the first plate cylinder 1 is stopped. At the same time, the clamper 27 of the first plate cylinder 1 is opened (S3
-3). The stop position of the first plate cylinder 1 at this time is a position where the clamper 27 faces directly below the guide plate 17 in FIG. At this time or immediately before that, in the plate making section 5, the platen 13 and the transport roller 16 are driven by the master feed motor 55 in accordance with the designation of double-sided printing and single-sided printing to send the master 4 to the first plate cylinder 1 side. While making a plate, the plate is made (S3-4). That is, a voltage is applied to the heating elements of the thermal head 14 based on image data to be printed on the front surface or the back surface of the paper P, and an image is formed by perforating the master 4 with heat. Since the transport length of the master 4 can be detected by the number of pulses for driving the master feed motor 55, when it is determined that the master feed motor 55 has rotated a predetermined pulse (S3-5), the leading end of the master 4 is determined. Arrives at the clamper 27, the first clamper 27 is closed (S3-6). Thus, the leading end of the master 4 is held by the clamper 27 of the first plate cylinder 1. Therefore,
By rotating the first plate cylinder 1 counterclockwise (S3-7), the winding of the master 4 on the first plate cylinder 1 is started. When the master 4 is sent out by a predetermined length in the plate making section 5, the length corresponds to the number of pulses of the master feed motor 55, so that the end of plate making is recognized by counting the number of pulses (S3-8). Can be. When the prepress is completed, the cutter 15 is driven to cut the master 4 (S
3-9). During this time, the first plate cylinder 1 continues to rotate counterclockwise, but it is determined that the first plate cylinder 1 has rotated by a predetermined pulse (S3-
10) When the transfer of the master 4 in the plate making section 5 is stopped, the first plate cylinder 1 is stopped (S3-11).

Here, steps S3-1 to S3-11
The master 4 made by the plate making unit 5 is transferred to the first plate cylinder 1.
This corresponds to first winding operation control means for controlling the rotation operation of the first plate cylinder 1 and the opening / closing operation of the clamper 27 of the first plate cylinder 1 so as to wind it around.

If double-sided printing is specified, image data to be printed on the back side of the sheet P is output as described above. Is determined to be NO, the process proceeds to step S3-13.

In this step S3-13, it is determined that the transfer cylinder 3 has been rotated and rotated by a predetermined pulse (S3-1).
4), the transfer cylinder 3 is stopped (S3-15). The stop position of the transfer cylinder 3 at this time is the position shown in FIG. Then, the first plate cylinder 1 is rotated (S3-16), and when it is determined that the pulse has been rotated by a predetermined pulse (S3-17), the first plate cylinder 1 is stopped and the clamper of the transfer cylinder 3 is stopped. 27 is released (S3-18). The stop position of the first plate cylinder 1 at this time is the position shown in FIG. Subsequently, in step S3-19, the clamper 27 of the transfer cylinder 3 is closed, and the clamper 27 of the first plate cylinder 1 is opened.
As shown in FIG. 8, when it is determined that the first plate cylinder 1 and the transfer cylinder 3 have been rotated in the direction opposite to the printing direction and have been rotated by a predetermined pulse (S3-20), the first cylinder 1 and the transfer cylinder 3 are rotated. The plate cylinder 1 and the transfer cylinder 3 are stopped (S3-21). As a result, as shown in FIG.
Can be peeled from the outer periphery of the first plate cylinder 1 and wound around the outer periphery of the transfer cylinder 3. Then, step S
In 3-22, as shown in FIG.
The blower fan 60 (see FIG. 11) is driven while rotating the transfer cylinder 3 clockwise by a predetermined number of pulses, and the clamper 27 of the second plate cylinder 2 is closed.
Then, the second plate cylinder 2 is rotated counterclockwise as shown in FIG. 12 (S3-23), and when it is determined that the second plate cylinder 2 has been rotated by a predetermined number of pulses (S3-24), the second plate cylinder is rotated. 2 is stopped (S3-25).

In this case, steps S3-13 to S3-2
5 corresponds to steps S2-7 to S2- described with reference to FIG.
In the same manner as in the processing of No. 19, the first plate cylinder 1 and the transfer cylinder 3 are so wound that the master 4 wound around the first plate cylinder 1 is sequentially wound around the outer circumference of the transfer cylinder 3 and the second plate cylinder 2. And a second winding operation control means for controlling the rotation operation of the second plate cylinder 2 and the opening / closing operation of the clampers 27 of the first and second plate cylinders 1 and 2 and the transfer cylinder 3.

After the master 4 for the second plate cylinder 2 having perforated image data for printing on the back surface of the sheet P is wound around the second plate cylinder 2, steps S3-1 to S3-
The process 12 is repeated, and the master 4 for the first plate cylinder 1 pierced with image data to be printed on the surface of the sheet P is wound around the first plate cylinder 1. At this time, step S3
At -12, the prepress process is terminated to determine that the prepress was performed based on the image data on the surface of the sheet.

As shown in FIG. 7, when the master 4 is re-wound from the first plate cylinder 1 to the transfer cylinder 3, the transfer cylinder 3
The upper clamper 27 is opened on a tangent line at the contact point between the first plate cylinder 1 and the transfer cylinder 3, so that the clamper 2 of the master 4 is opened.
7 can be reliably delivered. On the other hand, as shown in FIG. 10, when the master 4 is transferred from the transfer cylinder 3 to the second plate cylinder 2, the second clamper 27 is located slightly off the tangent to the transfer cylinder 3. As shown in FIG. 11, since the master 4 can be brought into close contact with the inner surface of the opened clamper 27 by the wind pressure of the blower fan 60, when the clamper 27 is closed, the end of the master 4 is connected to the clamper of the second plate cylinder 2. 27 allows for more reliable holding.

Next, the printing process will be described with reference to FIG. First, the second plate cylinder 2 contacts the transfer cylinder 3 (S4
-1). This is, as described above, the forward / backward drive unit 38.
Depends on the operation. Subsequently, when the second plate cylinder 2 and the transfer cylinder 3 are rotated in opposite directions (S4-2), the inside of the second plate cylinder 2 passes through the master 4 wound around the second plate cylinder 2. The exuded ink is transferred to the transfer cylinder 3. When the second plate cylinder 2 and the transfer cylinder 3 rotate by a predetermined pulse, it is possible to judge that the transfer is completed by counting the pulses (S4-3). At this time, the second plate cylinder 2 is separated from the transfer cylinder 3 by the operation of the advance / retreat drive unit 38, and the paper supply unit 7 is driven to move the sheet P between the first plate cylinder 1 and the transfer cylinder 3. Paper is fed (S4-4). When the sensor S detects the leading end of the sheet P (S4-5), the advance / retreat driving unit 37 contacts the sheet P on the transfer cylinder 3 via the master 4 around which the first plate cylinder 1 is wound ( S4-6), and immediately thereafter (or immediately before or simultaneously), the first plate cylinder 1 and the transfer cylinder 3 are rotated in the printing direction at the same speed (S4-7). At this time, the first plate cylinder 1 rotates counterclockwise, and the transfer cylinder 3 rotates clockwise. Thereby, the ink inside the first plate cylinder 1 oozes out through the master 4 wound around the first plate cylinder 1 and is transferred to the surface of the sheet P, and the transfer image on the transfer cylinder 3 is transferred to the sheet P. Since the image is transferred to the back surface of P, double-sided printing is performed at a time. The sheet P conveyed to the first plate cylinder 1 and the transfer cylinder 3 is
The paper is discharged to the paper discharge tray 9 by the belt conveyor 10. Then, when it is determined that the first plate cylinder 1 and the transfer cylinder 3 have rotated by a predetermined pulse (S4-8), the first plate cylinder 1 is separated from the transfer cylinder 3 by the operation of the advance / retreat drive unit 37. Then, the first plate cylinder 1 and the transfer cylinder 3 are stopped (S4-
9). Subsequently, the outer circumference of the transfer cylinder 3 is cleaned by the cleaning unit 31 (S4-10). That is, the cleaner supply roller 33 controls the cleaner tank 32.
The outer circumference of the transfer cylinder 3 is cleaned by the cleaning roller 34 to which the cleaner liquid is supplied, and the transfer image on the surface is wiped off.

Here, steps S4-1 to S4-10
Drives the second plate cylinder 2 around which the master 4 is wound
8, the second plate cylinder 2 and the transfer cylinder 3 are brought into contact with the transfer cylinder 3.
Are rotated in opposite directions to transfer the ink oozed from the inside of the second plate cylinder 2 through the master 4 to the transfer cylinder 3, and synchronized with the sheet feeding operation of the sheet feeding unit 7 to transfer the master 4 The first plate cylinder 1 on which the ink is wound is brought into contact with the transfer cylinder 3 to transfer the ink oozed from the inside of the first plate cylinder 1 via the master 4 onto one surface of the paper P. It corresponds to a printing operation control unit that controls the operations of the advance / retreat driving units 37 and 38 and the drum motor 57 so as to transfer the transfer image on the transfer cylinder 3 to the other surface of the sheet P.

The image printed on the back side of the paper P is
It is immediately loaded on the paper P printed before that,
The ink layer transferred to the back surface of the paper P is a hard transfer cylinder 3
Is pressed into contact with the surface of the sheet P and penetrates into the inside of the sheet P, so that the ink does not rise from the back of the sheet P and is thin and easily dried. As a result, even if the image on the back surface of the sheet P is immediately stacked on the previously printed sheet P, the image on the back surface is not smeared by being rubbed by the lower sheet P.

Further, the master 4 made by the plate making section 5 as described above is wound around the first plate cylinder 1, and the master 4 wound around the first plate cylinder 1 is transferred to the second cylinder via the transfer cylinder 3. Of the first plate cylinder 1
Alternatively, single-sided printing can be performed by winding the bleeding master 4 around the second plate cylinder 2. As a result, the ink image is transferred to the transfer cylinder 3 by winding the master 4 only on the second plate cylinder 2, and the paper P is pressed against the first plate cylinder 1 by the hard transfer cylinder 3, whereby the transfer cylinder 3 is pressed. It is also possible to select a use mode in which the upper ink image is allowed to penetrate into the inside of the paper P to create a printed material having a thin ink layer.

[0048]

According to the stencil printing method of the first aspect,
Since the master to be wound around the second plate cylinder was wound around the second plate cylinder via the first plate cylinder and the transfer cylinder,
At the time of double-sided printing, two masters for the second plate cylinder and the first plate cylinder can be made by the same plate making unit.
Therefore, it is possible to contribute to miniaturization and cost reduction of the device.

According to the stencil printing method of the second aspect, after the master on the second plate cylinder is removed by the plate discharging section, the master on the first plate cylinder is transferred to the second plate cylinder via the transfer cylinder. Since it is wound on the cylinder, the used masters wound on the first and second plate cylinders can be removed on the outer circumference of the second plate cylinder by the same plate discharging section. Therefore, only one plate discharging section is required, which can contribute to downsizing and cost reduction of the apparatus.

According to the stencil printing apparatus of the third aspect, the master made by the plate making section is wound around the first plate cylinder by the first winding operation control means, and the master wound around the first plate cylinder is removed. The second winding operation control means winds around the second plate cylinder via the transfer cylinder. In this way, after winding the master around the first and second plate cylinders, the control of the printing operation control means is performed. With this, the second plate cylinder is brought into contact with the transfer cylinder by the advance / retreat drive unit, and the second plate cylinder and the transfer cylinder are rotated in directions opposite to each other to bleed from the inside of the second plate cylinder via the master. The transferred ink is transferred to the transfer cylinder, and the first plate cylinder is brought into contact with the transfer cylinder by the advance / retreat drive unit in synchronization with the sheet feeding operation of the sheet feeding unit, and the inside of the first plate cylinder is passed through the master via the master. To transfer the exuded ink to one side of the paper The transfer image on the transfer cylinder is transferred to the other side of the sheet so that the sheet is simultaneously printed on both sides of the sheet in a single paper feeding process. Is removed by the plate discharging unit, and the used master on the first plate cylinder can be wound around the second plate cylinder by the second winding operation control means as described above. The master to be wound on the second plate cylinder can be made in one plate making section, and the master used in the first and second plate cylinders is removed by one plate discharging section on the outer circumference of the second plate cylinder. Therefore, the size and cost of the device can be reduced.

The stencil printing apparatus according to the fourth aspect is the third aspect.
In the invention described in the above, since the reciprocating drive unit is configured to move the first and second plate cylinders toward and away from the transfer cylinder whose axis is set at the fixed position, the transfer cylinder rotating at the fixed position. In contrast, the first and second plate cylinders can be independently brought into contact with and separated from each other, whereby the paper transport path can be maintained at a constant position on the outer peripheral surface of the transfer cylinder.

The stencil printing apparatus according to the fifth aspect is the third aspect of the present invention.
Or, in the invention according to the fourth aspect, since a blower fan for pressing the end of the master toward the inner surface of the opened clamper by wind pressure is provided, the first plate cylinder to the transfer cylinder, or the transfer plate to the second plate. When the master is wound around the cylinder, the master can be reliably transferred from the preceding cylinder to the clamper of the next cylinder.

According to the master winding device of the stencil printing machine of the present invention, the master made by the plate making section is wound around the first plate cylinder by the first winding operation control means. The master wound around the plate cylinder is wound around the second plate cylinder via the transfer cylinder by the second winding operation control means. In addition, the master used in the first and second plate cylinders can be removed by one plate discharging portion on the outer periphery of the second plate cylinder. This makes it possible to reduce the size and cost of the device.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a main part of a stencil printing apparatus.

FIG. 2 is a longitudinal sectional front view showing an advance / retreat drive unit of a first plate cylinder.

FIG. 3 is a front view showing a transfer cylinder.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is an explanatory diagram showing a state in which a master is wound around a first plate cylinder from the front.

FIG. 6 is an explanatory diagram illustrating a process of rewinding a master on a first plate cylinder around a transfer cylinder from the front.

FIG. 7 is an explanatory diagram showing from the front a process of rewinding the master on the first plate cylinder around the transfer cylinder.

FIG. 8 is a front view illustrating a process of rewinding a master on a first plate cylinder around a transfer cylinder.

FIG. 9 is an explanatory diagram showing, from the front, a process of winding the master on the first plate cylinder around the transfer cylinder.

FIG. 10 is an explanatory diagram showing from the front a process of rewinding a master on a transfer cylinder around a second plate cylinder.

FIG. 11 is an explanatory diagram showing the operation of the blower fan.

FIG. 12 is an explanatory diagram showing from the front a process of rewinding a master on a transfer cylinder around a second plate cylinder.

FIG. 13 is an explanatory view showing a state where the master on the transfer cylinder is wound around the second plate cylinder from the front.

FIG. 14 is a flowchart showing the flow of the entire process.

FIG. 15 is a flowchart illustrating a plate discharging process.

FIG. 16 is a flowchart showing a plate making process.

FIG. 17 is a flowchart illustrating a printing process.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 first plate cylinder 2 second plate cylinder 3 transfer cylinder 4 master 5 plate making unit 7 paper feed unit 27 clamper 35 plate discharge unit 37, 38 advance / retreat drive unit 57 drum motor 60 blower fan P paper S3-1 to S3-11 First winding operation control means S2-7 to S2-19, S3-13 to S3-25
Second winding operation control means S4-1 to S4-10 Printing operation control means

Claims (6)

[Claims] 1. A first and a second plate cylinder and a transfer cylinder each provided with an openable and closable clamper for holding one end of a master on the outer periphery are rotated in synchronization with each other, and each of the clampers is opened and closed in a timely manner. Then, the master is sequentially wound around the first plate cylinder, the transfer cylinder, and the second plate cylinder, and is held on the second plate cylinder. Is wound around the outer circumference of the first plate cylinder while rotating the first plate cylinder, and from the inside of the second plate cylinder while rotating the second plate cylinder and the transfer cylinder in opposite directions. The ink exuded through the master is transferred to the transfer cylinder, and paper is fed between the first plate cylinder and the transfer cylinder while rotating the first and second transfer cylinders in opposite directions. From the inside of the plate cylinder through the master A stencil printing method, wherein the discharged ink is transferred to one surface of the paper and the transfer image on the transfer cylinder is transferred to the other surface of the paper. 2. A master having an image formed thereon is wound around first and second plate cylinders each having an openable and closable clamper for holding one end of the master, and a clamper is wound around the second plate cylinder and the outer periphery. Transferring the ink oozed through the master from the inside of the second plate cylinder to the transfer cylinder while rotating the transfer cylinder provided in the opposite direction to the transfer cylinder, wherein the first plate cylinder and the transfer cylinder The paper is fed between the two while rotating in the opposite directions to each other, and the ink oozed out from the inside of the first plate cylinder via the master is transferred to one surface of the paper, and After transferring the transfer image on the transfer cylinder to the other surface of the sheet and removing the master wound around the second plate cylinder by a plate discharging unit, the first and second plate cylinders and the transfer cylinder are removed. And rotate them in synchronization with each other. After the master wound on the first plate cylinder is wound around the second plate cylinder via the transfer cylinder by opening and closing at a time, the master on the second plate cylinder is A stencil printing method, wherein the stencil is removed by the stencil discharging unit. 3. A transfer cylinder having an openable / closable clamper on an outer periphery for holding an end of a master, and a transfer cylinder having an openable / closable clamper on an outer periphery for holding an end of the master, the ink being exuded from the inside. First and second plate cylinders, a drum motor for driving the first and second plate cylinders and the transfer cylinder, and contacting the first and second plate cylinders relatively to the transfer cylinder An advancing / retracting drive unit for separating, and a second control unit for controlling a rotating operation of the first plate cylinder and an opening / closing operation of a clamper of the first plate cylinder so as to wind a master made by the plate making unit around the first plate cylinder. One winding operation control means, and the first plate cylinder and the transfer cylinder so that a master wound around the first plate cylinder is sequentially wound around the outer circumference of the transfer cylinder and the second plate cylinder. And the rotation operation of the second plate cylinder and the first and second plate cylinders and Second winding operation control means for controlling the opening and closing operation of the clamper of the transfer cylinder, a paper feeding unit for feeding paper between the first plate cylinder and the transfer cylinder, and the master is wound. The second plate cylinder is brought into contact with the transfer cylinder by the advancing / retracting drive unit, and the second plate cylinder and the transfer cylinder are rotated in opposite directions to each other so that the second plate cylinder is rotated from the inside of the second plate cylinder. The ink exuded through the master is transferred to the transfer cylinder, and the first plate cylinder on which the master is wound is transferred by the advance / retreat drive unit in synchronization with the sheet feeding operation of the sheet feeding unit. The ink that is in contact with the cylinder and oozes out from the inside of the first plate cylinder via the master is transferred to one surface of the paper, and the transferred image on the transfer cylinder is transferred to the other surface of the paper. Controls the operation of the advance / retreat drive unit and the drum motor so as to transfer A stencil printing apparatus comprising: a printing operation control unit that performs printing; and a plate discharge unit that removes the master on the second plate cylinder. 4. The apparatus according to claim 3, wherein the forward / backward drive unit is configured to move the first and second plate cylinders toward and away from the transfer cylinder whose axis is set at a fixed position. Stencil printing equipment. 5. The stencil printing apparatus according to claim 3, further comprising a blower fan for pressing an end of the master toward the inner surface of the opened clamper by wind pressure. 6. A transfer cylinder having an openable and closable clamper on an outer periphery for holding an end of a master, and a transfer cylinder having an openable and closable clamper on an outer periphery for holding an end of the master, and allowing ink to seep out from the inside. A drum motor for driving the first and second plate cylinders, the first and second plate cylinders and the transfer cylinder, and the second plate cylinder so that a master made by a plate making unit is wound around the first plate cylinder. First winding operation control means for controlling a rotation operation of one plate cylinder and an opening / closing operation of a clamper of the first plate cylinder; and a master wound around the first plate cylinder, the transfer cylinder and the first The first plate cylinder, the transfer cylinder, and the rotation operation of the second plate cylinder and the clampers of the first, second plate cylinder, and the transfer cylinder are sequentially wound around the outer periphery of the second plate cylinder. Second winding operation control means for controlling the opening and closing operation,
A master winding device for a stencil printing machine, comprising: