JPH09300806A - Thin-wall plate cylinder rotary stencil press and ink test operation method and printing operation method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a clear printing on a first sheet even after a long period of suspension of printing. SOLUTION: A movable plate 26 axially supporting an ink roller 40 is rotatably supported on a stationary plate 20. The plate 26 is normally held at an upper position by a coil spring 30, one end of which is fixed at an offset position of a rotary cam 34 driven by a motor 32. When it is presumed that ink of a plate cylinder 10 is dried and in short supply due to a long period of suspension of use, the motor 32 is rotated to loosen the spring 30, allowing the plate 26 to rotate under gravitation thereby to bring the ink roller 40 into contact with the plate cylinder 10 to rotate the cylinder 10, whereby an ink test operation for feeding ink is performed and the motor 32 is actuated to return the plate 26 to the upper position to perform a printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate cylinder type rotary stencil printing press, an ink familiar running method and a printing running method of the printing machine.

[0002]

2. Description of the Related Art Generally, a thin plate cylinder type rotary stencil printing machine is
As shown in FIG. 5, printing is performed by allowing the printing paper 98 to pass while passing through the thin plate cylinder 90 on which the printing base paper 96 is mounted and rotates.
Specifically, the thin plate cylinder 90 includes a thin metal cylinder and a screen outside the thin metal cylinder. The plate cylinder 90 has an ink permeation region 91 composed of innumerable through holes, and an ink roller 92 is provided inside the plate cylinder 90. Then, the printing base paper 96 is mounted on the outer peripheral surface of the plate cylinder 90 so as to cover the ink permeation region 91. After that, when printing is performed on the printing paper 98, the press roller 94 transfers the printing paper 98 to the printing base paper 9 of the plate cylinder 90.
Press onto # 6. At this time, since the plate cylinder 90 has a thin structure, when it is pressed by the press roller 94, it is slightly inward.
For example, it is deformed by about 0.2 mm, and the deformed inner peripheral surface 93 of the plate cylinder 90 comes into contact with the outer peripheral surface of the ink roller 92 rotating at a fixed position to supply ink to the inner peripheral surface 93 of the plate cylinder 90. The supplied ink is supplied to the ink permeation area 9 of the plate cylinder 90.
1 through the holes formed in the printing base paper 96 to the printing paper 9
8 is pushed out and printing is performed. Then, the press roller 94 immediately before the end of printing, that is, the printing paper 98
Immediately before the end portion of the plate cylinder passes, the plate cylinder 90 is separated from the plate cylinder 90 and is deformed inward to return to the original shape, and a gap is formed between the inner peripheral surface 93 of the plate cylinder 90 and the ink roller 92. The ink is formed and brought into a non-contact state, the supply of ink is stopped, and the ink does not overflow from the rear end portion 96a of the base paper.

By the way, when such a thin plate cylinder type rotary stencil printing machine is not used for a long time, the ink on the inner peripheral surface 93 of the plate cylinder 90 dries and decreases. The cause of the ink drying is related to temperature conditions, humidity conditions, and other factors in addition to non-use for a long time. Therefore, when printing is performed again, until the sufficient amount of ink is supplied from the ink roller 92 to the inner peripheral surface 93 of the plate cylinder 93, the print density becomes thin due to lack of ink, and clear printing cannot be obtained. The first few prints may be wasted.

[0004]

Therefore, the technical problem to be solved by the present invention is that the ink on the plate cylinder is dried due to the fact that it is not used for a long time. To provide a thin-plate cylinder rotary stencil printing machine capable of clear printing from the first sheet, and an ink familiar operation method and a printing operation method of the printing machine.

[0005]

In order to solve the above technical problems, the thin plate cylinder type rotary stencil printing machine according to the present invention is configured as follows.

The thin plate cylinder type rotary stencil printing machine comprises a thin plate cylinder, an ink supply means including an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, and an ink roller opposed to the ink roller with the plate cylinder interposed therebetween. In addition, the press roller is provided so as to be able to come into contact with and separate from the plate cylinder and the ink roller.
At the time of non-printing, that is, before and after printing, the press roller, the plate cylinder, and the ink roller are separated from each other, and at the time of printing, the press roller is pressed against the plate cylinder, whereby the plate cylinder is elastic. It deforms and contacts the ink roller. The thin plate cylinder rotary stencil printing machine includes an ink roller moving unit and a control unit. The ink roller moving means moves the ink roller from a normal position separated from the inner peripheral surface of the plate cylinder to a contact position in contact with the inner peripheral surface of the plate cylinder during non-printing. The control means determines whether or not the ink familiar operation is necessary based on the ink state of the plate cylinder, for example, the ink distribution amount, the dried state, the viscosity, the temperature, etc., and the ink familiar operation is required. When the determination is made, before printing, the ink roller moving means is operated and the plate cylinder is rotated for a predetermined time to perform an ink familiarizing operation for replenishing the plate cylinder with ink, and after the ink familiarizing operation is completed, The operation of the ink roller moving means is stopped to return the ink roller to the normal position.

In the above arrangement, the control means determines whether or not the ink familiar operation is necessary before printing.
That is, if the ink on the plate cylinder is dry or the temperature is low, and if it is expected that clear printing will not be obtained from the beginning if printing immediately, it is determined that the ink familiar operation is necessary. To do.

When it is determined that the ink familiar operation is necessary, the control means first activates the ink roller moving means and rotates the plate cylinder to perform the ink familiar operation before printing. That is, the ink roller, which has been separated from the inner peripheral surface of the plate cylinder, is moved to come into contact with the inner peripheral surface of the plate cylinder to replenish the plate cylinder with ink. At this time,
Either of the start of the operation of the ink roller moving means and the start of the rotation of the plate cylinder may be performed first, or may be started at the same time.

Next, after the ink familiarizing operation for a predetermined time is completed, the operation of the ink roller moving means is stopped to separate the ink roller from the inner peripheral surface of the plate cylinder. At this time,
The rotation of the plate cylinder may be stopped, or the rotation may be continued as it is in preparation for the next printing.

The control means performs the familiar ink operation as described above when it is determined that the familiar ink operation is necessary, and immediately after determining that the familiar ink operation is unnecessary, according to a known method. Make it print. That is, in synchronization with the passage of the printing paper between the plate cylinder and the press roller, the press roller is moved to the printing paper,
Printing is performed by press-contacting the plate cylinder and the ink roller, and pushing the ink from the plate cylinder through the print original onto the printing paper.

In the above construction, when the ink is dry and the ink in the plate cylinder is insufficient, the ink familiar operation can be performed to replenish the ink. Therefore, even when the ink on the plate cylinder is dried due to the non-use state continuing for a long time, clear printing can be performed from the first first sheet.

Preferably, the press roller is arranged on the lower side and the ink roller is arranged on the upper side with the plate cylinder interposed therebetween. The ink roller moving means includes an ink roller supporting member, a stopper member, a biasing member, and a biasing releasing means. The ink roller support member rotatably supports the ink roller and is movably supported so that the ink roller can be brought into contact with and separated from the inner peripheral surface of the plate cylinder. In the natural state, the ink roller descends. Contact the inner surface of the plate cylinder. The stopper member is provided so as to come into contact with the ink roller support member to prevent movement of the ink roller support member, and is dimensioned so that the ink roller is in the normal position when the ink roller support member comes into contact. Has been done. The biasing member always biases the ink roller supporting member to bring the ink roller supporting member into contact with the stopper member. The urging release means releases the urging force by which the urging member urges the ink roller support member toward the stopper member.

In the above arrangement, the control means actuates the biasing release means of the ink roller moving means to release the biasing force of the biasing member during the ink familiarizing operation. As a result, the ink roller support member held at the normal position moves by its own weight, the ink roller comes into contact with the inner peripheral surface of the plate cylinder, and the ink familiar operation becomes possible. On the other hand, when the operation of the urging release means is stopped, the urging member urges the ink roller support member to the normal position. Since the ink roller support member contacts the stopper member, the ink roller is held at the normal position even when the ink roller is biased by the press roller and the plate cylinder during printing. Therefore, the ink familiar operation can be performed with a simple configuration.

The present invention also provides an ink familiar operating method for a thin plate cylinder type rotary stencil printing machine.

An ink familiarizing operation method in a thin plate cylinder type rotary stencil printing machine comprises a first step and a second step. The thin plate cylinder type rotary stencil printing machine includes a thin plate cylinder, an ink supply unit including an ink roller for supplying ink to the inner peripheral surface of the plate cylinder, and the ink roller facing the ink roller with the plate cylinder interposed therebetween. The press cylinder is provided so as to be able to come into contact with and separate from the plate cylinder and the ink roller, and when not printing,
The press roller, the plate cylinder, and the ink roller are separated from each other, and during printing, the press roller is pressed against the plate cylinder, whereby the plate cylinder elastically deforms and contacts the ink roller. In the first step, when the ink familiar operation is required, the press roller remains in a non-press contact state with the plate cylinder and the ink roller,
Ink is supplied to the plate cylinder by moving the ink roller from a normal position separated from the inner peripheral surface of the plate cylinder to a contact position in contact with the inner peripheral surface of the plate cylinder and rotating the plate cylinder. Perform ink familiar operation. The second
In the step, after the ink familiarizing operation, the ink roller is returned to the normal position where it is not in contact with the inner peripheral surface of the plate cylinder.

In the above construction, when the ink is dry and the ink in the plate cylinder is insufficient, that is, when the ink familiar operation is required, in the first step, the ink roller is moved to move the ink to the plate cylinder. Add ink. Next, in the second step, the ink roller is returned to the normal position to be ready for printing. If the ink familiar operation is performed in this way, the ink shortage on the plate cylinder is resolved, so that the printing density does not become thin when the next printing is performed. Therefore, even when the ink on the plate cylinder is dried due to the non-use state continuing for a long time, clear printing can be performed from the first first sheet.

In the above arrangement, whether or not the ink familiar operation is necessary depends on the state of the ink on the plate cylinder, for example, the distribution amount of the ink.
Although it is necessary to make a determination based on the dry state, viscosity, temperature, etc., it is difficult to directly detect the ink state of the plate cylinder. Therefore, the state of the ink on the plate cylinder is estimated based on various factors to determine whether or not the ink familiar operation is necessary.

Preferably, the first step is the time elapsed from the end of the previous printing, the ink temperature, the ink ambient temperature inside the plate cylinder, the previous number of printed sheets, and whether or not the ink familiar operation was performed before the previous printing. Based on at least one factor in the total number of prints from the previous and previous previous plate making,
Determine whether ink familiar operation is required.

In the above construction, the elapsed time from the end of the previous printing can be one of the factors of judgment because the longer the non-printing state is, the more the ink on the plate cylinder is dried. The ink temperature affects the drying speed and the fluidity of the ink at the time of printing, and is one factor for the determination. The ambient ink temperature inside the plate cylinder is a factor that can be used instead of directly measuring the ink temperature. The previous number of prints, whether or not the ink familiar operation was performed before the previous print, and the total number of prints in the previous and previous platemaking influences the amount of ink contained in the plate cylinder. It becomes a factor. Therefore, it is possible to determine whether or not the ink familiar driving is necessary, based on the factors related to the ink state of the plate cylinder.

In the above construction, it is also possible to carry out the ink familiar operation under constant operation conditions regardless of the ink state of the plate cylinder.

Preferably, the first step is the time elapsed from the end of the previous printing, the ink temperature, the ink ambient temperature inside the plate cylinder, the previous number of printed sheets, and whether or not the ink familiar operation was performed before the previous printing. Change the operating condition of the ink familiar operation based on at least one factor of the total number of printed sheets in the previous and previous previous plate making.

In the above-mentioned structure, the operating condition of the ink familiar operation is changed according to the ink state of the plate cylinder to finely adjust the ink replenishment amount to make the ink state of the plate cylinder at the start of printing more uniform. As a result, it is possible to reduce variations in print density immediately after the start of printing.

Furthermore, the present invention provides an ink familiar operating method for a thin plate cylinder type rotary stencil printing machine.

That is, after carrying out the above-described ink familiarizing operation method, printing is carried out on at least the first sheet of paper by making the press contacting pressure of the press roller against the plate cylinder and the ink roller larger than usual.

In the above structure, although an appropriate amount of ink is supplied to the inner peripheral surface side of the plate cylinder by the ink familiar operation, the ink is likely to be insufficient on the outer peripheral surface side of the plate cylinder due to ink drying or the like. Since the amount of ink pushed out by the pressure contact force of the press roller is insufficient, even if the print density of the first sheet becomes thin, the pressure roller presses the press roller against the plate cylinder with a pressure force larger than usual to prevent the ink The amount of extrusion can be increased to prevent insufficient print density. Usually, the shortage of ink on the outer peripheral surface side of the plate cylinder is eliminated after the first printing of the first sheet, so that the normal pressure contact force is applied to the printing of the second and subsequent sheets. If this is not the case, the press contact force of the press roller after that may be made larger than usual, but at this time, the second sheet is more than the first sheet and the second sheet is the third sheet. The pressure contact force may be gradually reduced to approach the normal pressure contact force.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The thin plate cylinder type rotary stencil printing machine according to one embodiment of the present invention shown in FIGS. 1 to 4 will be described in detail below. FIG. 1 is an overall configuration diagram of a thin-walled cylinder cylinder rotary stencil printing machine according to an embodiment of the present invention. 2 to 4 are enlarged cross-sectional views of a main part of the plate cylinder of the printing machine of FIG. 1 at a substantially central position. 2 shows a state in which the ink roller and the inner peripheral surface of the plate cylinder are apart from each other during non-printing, and FIG. 3 shows that the ink roller is brought into contact with the inner peripheral surface of the plate cylinder before printing so that the ink is made to adapt to the ink. FIG. 4 shows a state when the press roller is in pressure contact with the plate cylinder (a printing sheet is not shown).

First, with reference to FIG. 1, an outline of the construction of a thin plate cylinder type printing press 1 according to an embodiment of the present invention will be described.

The printing machine 1 is provided with an apparatus main body 2 in which a transport mechanism 60 and a printing mechanism 70 are arranged, and a paper feed section 4 and a paper discharge section 6 arranged on both sides of the apparatus main body 2. Printing paper 8
The sheets are stacked on the sheet feeding section 4, and sequentially conveyed one by one from the top into the apparatus main body 2 by the sheet feeding ring 62 of the conveying mechanism 60. Then, the printing paper 8 is printed by the printing mechanism 70 provided in the middle of the transport path 64, and then discharged to the paper discharge unit 6 and stacked in order.

The printing mechanism 70 has a conveyance path 6 for the printing paper 8.
4, the plate cylinder 10 is provided on the upper side, and the press roller 50 is provided on the lower side.

Although not shown, the plate cylinder 10 has a generally cylindrical thin-walled metal cylinder, that is, a plate cylinder main body, and a screen for covering the outer peripheral surface of the plate cylinder main body. At a predetermined position of the plate cylinder main body, there is an ink passage portion, that is, an opening portion, in which innumerable through holes (through holes) are formed like dots. A stencil sheet (not shown) is attached to the outer peripheral surface of the screen of the plate cylinder so as to cover the aperture.

The printing mechanism 70 also includes an ink roller 40 and other ink supply means inside the plate cylinder 10. As shown in FIG. 2, the ink roller 40 is normally arranged with a predetermined gap, for example, 0.2 mm, between the ink roller 40 and the inner peripheral surface 13 of the plate cylinder 10 in a natural state, and the ink familiarizing operation before printing is performed. At times, as shown in FIG. 3, it is movably supported so as to come into contact with the inner peripheral surface of the plate cylinder 10.

More specifically, as shown in FIGS. 2 to 4, the fixing plate 20 is provided inside the plate cylinder 10 at a substantially central position in the width direction.
And a movable plate 26. The movable plate 26 is rotatably supported by the shaft support 22 of the fixed plate 20 below the fixed plate 20, and pivotally supports the ink roller 40 and the doctor roller 42.

Above the movable plate 26, a motor 32 and a micro switch 38 supported by a support member (not shown).
It is arranged. The output shaft of the motor 32 has a rotating cam 3
4 is fixed, and the contact arm 39 of the microswitch 38 abuts on the first and second cam surfaces 34a, 34b of the rotary cam 34. One end 36a of a spring locking plate 36 is pivotally supported at an eccentric position on the side surface of the rotary cam 34 opposite to the motor 32. A through hole 36b is provided at the other end of the spring locking plate 36.

One end of the coil spring 30 is inserted and locked in the through hole 36b. The other end of the coil spring 28 has a spring locking projection 2 provided on the movable plate 26.
It is designed to be locked at 8. As shown in FIGS. 2 and 4, the coil spring 30 is stretched when the motor 32 is rotated and the spring locking plate 36 is in the upper position, and the movable plate 26 is pulled up to project the protrusion 24 of the fixed plate 20. The movable plate 26 and the ink roller 40 are held at the upper position. When the movable plate 26 is at the upper position, the ink roller 40 is separated from the inner peripheral surface 13 of the plate cylinder 10 as shown in FIG.
As shown in FIG. 4, the press roller 50 is brought into pressure contact with the inner peripheral surface 13 of the plate cylinder 10 elastically deformed.

On the other hand, as shown in FIG. 3, when the motor 32 rotates to bring the spring locking plate 36 to the lower position, the movable plate 26 is moved.
The ink roller 40 is also at the lower position. That is,
The coil spring 30 has a natural length, and the urging force for pulling up the movable plate 26 is lost. Therefore, the movable plate 26 is rotated about its own axis by its own weight, and the ink roller 40 axially supported by the movable plate 26 descends and contacts the inner peripheral surface 13 of the plate cylinder 10.

The rotary cam 34 has a first cam surface 34a which is retracted radially inward and a second cam surface 3 which is radially outwardly projected.
4b, the microswitch 38 has its contact arm 3
9 is the first and second cam surfaces 34a of the rotary cam 34,
It is possible to detect which one of 34b is in contact. The motor 32 is controlled so as to always rotate in the clockwise direction shown by the arrow 84, and when the spring locking plate 36 rises, the tip of the contact arm 39 of the micro switch 38 contacts the first cam surface 34a of the rotating cam 34. , Spring locking plate 3
When 6 descends, the tip of the contact arm 39 of the micro switch 38 comes into contact with the second cam surface 34a of the rotary cam 34.

In addition to the ink roller 40 and the doctor roller 42, the printing mechanism 70 includes the ink roller 4 as shown in FIG.
The ink supply unit 44 is provided substantially above 0. The ink 46 is dropped from the ink supply unit 44, and the doctor roller 42 applies an appropriate amount of the ink 46 to the outer peripheral surface of the ink roller 40. The supply of the ink 46 is controlled by detecting the amount of ink accumulated in the wedge-shaped portion between the ink roller 40 and the doctor roller 42. Further, a temperature sensor (not shown) is provided at or around the wedge-shaped portion.

The press roller 50 is arranged just below the plate cylinder 10 and faces the ink roller 40 across the plate cylinder 10. As shown in FIG. 1, the press roller 50 is supported so as to be vertically movable around a fulcrum 52, and is pressed by a drive mechanism (not shown) between a pressure contact position in which the press roller 50 is in pressure contact with the plate cylinder 10 and a retracted position away from the plate cylinder 10. It can be moved between two positions. The drive mechanism can adjust the pressure contact force when the press roller 50 is pressed against the plate cylinder 10.

The printing press 1 also includes a control device 100, such as a sequencer or a microcomputer. A signal from the micro switch 38, a signal from a temperature sensor (not shown), or the like is input to the control device 100,
A control signal is sent to the motor 32, the transport mechanism 60, etc. according to a pre-programmed procedure. In addition, the control device 100
Can be connected to an external personal computer (not shown), and the operation of the printing machine 1 can be controlled from the personal computer. For example, it is possible to send image information created by a personal computer to the printing machine 1, directly make a stencil sheet, and print a predetermined number of sheets.

Next, the operation of the thin plate cylinder type rotary stencil printing machine 1 will be described.

In the printing press 1, when not printing, the press roller 50 is separated from the plate cylinder 10 as shown in FIG.
6 is located at the upper position, and a gap is formed between the ink roller 40 and the inner peripheral surface 13 of the plate cylinder 10.
The ink 46 is not supplied to the plate cylinder 10 from the plate. At this time, as shown in FIG.
The spring locking plate 36 is raised most and the coil spring 30 is stopped at the first position where it is in the most extended state.

When a plate making button (not shown) of the printing press 1 is pressed, the stencil sheet is removed from the plate cylinder 10 by the control of the control device 100, a new stencil sheet is made and attached to the plate cylinder 10, The ink familiar operation is performed as necessary, and a preset number of sheets are printed.
When the number of print sheets is not set in advance, only one sheet is printed. When a print button (not shown) is pressed, further printing can be performed using the stencil sheet already mounted on the plate cylinder 10.

The control device 100, before starting printing,
Based on various factors such as past operation history and current ink temperature of the printing press 1, whether or not ink familiar operation is necessary,
judge. As an example, when at least one of the following conditions is satisfied, the control device 100 commands the execution of the familiar ink operation. That is, (1) When not used for more than 8 hours. (2) Do not use for more than 1 hour, and ink temperature is 10 °
If C or less. (3) When the number of printed sheets in the previous platemaking is 5 or less. (4) The number of printed sheets in the previous platemaking was 10 or less, and
When ink familiar operation was not performed at the previous plate making. (5) The total number of printed sheets in the previous and previous plate making is 2
When the number is 0 or less. Here, the non-use time is the simplest if it is the time from when the power of the printing press 1 is turned off to when the power is turned on again, and the built-in timer of the control device 100 causes the built-in timer of the control device 100 to finish printing, for example, the last press roller. It is the time from the time of descending until the plate making button is pressed.

The above (1) is a case where it is predicted that the ink has dried due to the passage of a long time. Above (2)
Indicates the viscosity of the ink and the like. Above (3)
(5) is a case where it is predicted that the ink will not be familiar to the plate cylinder. Instead of the ink temperature, the environmental temperature inside the plate cylinder 10 may be used for the determination.

When it is determined that the ink familiar operation is necessary, the control device 100 idles the plate cylinder 10 to rotate the motor 3
2 is rotated to loosen the coil spring 30, and the movable plate 26 and the ink roller 40 are lowered. Specifically, the control device 100 detects the change in the output signal of the micro switch 38, that is, the second cam surface 34 of the rotary cam 34.
The motor 32 is rotated in the clockwise direction indicated by the arrow 84 until the contact arm 39 of the microswitch 38, which has been in contact with b, comes into contact with the first cam surface 34a of the rotary cam 34, and the spring locking plate 36 is lowered. When the motor 34 stops,
As shown in FIG. 3, the spring locking plate 36 is at the lower position. As a result, the movable plate 26 is rotated by its own weight,
The ink roller 40 contacts the inner peripheral surface 13 of the plate cylinder 10.
The ink roller 40 rotates in contact with the rotating plate cylinder 10 to supply the ink 46 to the plate cylinder 10.

In such an ink familiar operation, the number of rotations of the plate cylinder 10 in the state of being in contact with the ink roller 40 is determined so as to supply the ink in an amount corresponding to the ink shortage state. As an example, when the non-use time is less than one day, the plate cylinder 10 is in contact with the ink roller 40.
10 rotations, 15 rotations when the non-use time is from 1 day to 1 week, 20 rotations from 1 week to 1 month, and 30 rotations from 1 month or more. Further, each time the ink temperature drops by 1 ° C from 10 ° C, the number of rotations is further increased by two. This makes it possible to deal with a case where the ink temperature is low and the ink supply amount during the familiar ink operation is small.

After the above-described ink familiarizing operation is completed, the controller 100 returns the ink roller 40 to the upper position. Specifically, the control device detects the change in the output signal of the micro switch 38, that is, the first position of the rotary cam 34.
The motor 32 is rotated in the clockwise direction indicated by the arrow 84 until the contact arm 39 of the micro switch 38, which has been in contact with the cam surface 34a, is in contact with the second cam surface 34b of the rotating cam 34,
The spring locking plate 36 is raised. As a result, the movable plate 2
6 is held in the upper position, returns to the initial state shown in FIG. 2, and is ready to start printing.

Next, the controller 100 controls the plate cylinder 10, the ink roller 40, and the press roller 50 as in the conventional apparatus.
Printing is performed by rotating and in synchronization with each other.
Specifically, the control device 100 operates the transport mechanism 60 to feed the printing paper 8 into the transport path 64 at regular intervals. In synchronization with when the printing paper 8 reaches between the plate cylinder 10 and the press roller 50, the press roller 50 is raised around a fulcrum 52, and the printing paper 8 is pressed against the printing base paper mounted on the printing cylinder 10. . At this time, the plate cylinder 10 is shown in FIG.
As shown in FIG. 3, the inner peripheral surface 13 of the plate cylinder 10 is locally pushed inward by being pressed by the press roller 50, and the inner peripheral surface 13 of the plate cylinder 10 is
0 contact with the outer peripheral surface. As a result, the ink roller 4
Ink is supplied to the plate cylinder 10 from 0 and the plate cylinder 1
The ink 46 of No. 0 is pushed out onto the printing paper 8 from the opening portion of the plate cylinder main body through the screen, through the holes formed in the stencil sheet. That is, it is printed. Printing paper 8
In the state of being pressed in this manner, as the plate cylinder 10 rotates, the sheet is sent from the start end side to the end side. Immediately before the trailing edge of the printing paper 8 passes between the plate cylinder 10 and the press roller 50, that is, immediately before the end of printing, the press roller 50 is lowered around the fulcrum 52 and retracted from the plate cylinder 10. . At this time, the printing paper 8 is not pressed against the plate cylinder 10, the plate cylinder 10 is no longer pushed by the press roller 50, and the plate cylinder 10 deformed inward returns to its original shape and is separated from the ink roller 40. Will be
Ink supply is stopped.

As described above, the control device 100 has the plate cylinder 1
Press roller 5 only when printing paper 8 is between 0 and
0 is raised and the printing is performed by sandwiching the printing paper 8 between the printing cylinder 8 and the plate cylinder 10.
The set value of the pressure contact force when the press roller 50 is pressed against the plate cylinder 10 can be changed by an operation button or a connected personal computer, and the print density can be adjusted.

Furthermore, in this printing press 1, when the ink familiar operation is performed before printing, the control device 100
Only during the first printing of the first sheet, the pressure contact force of the press roller 50 against the plate cylinder 10 is set to be 20 to 100% larger than the set value. As a result, clear printing can be obtained from the first sheet even when the ink on the outer side of the plate cylinder 10 is dry.

As described above, the rotary stencil printing machine 1 is initially operated even when the ink on the inner peripheral surface 13 of the plate cylinder 10 is dried due to a long period of non-use. Clear printing is possible from the first sheet.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example, the mechanism for moving the ink roller during the ink familiar operation may have various configurations other than the present embodiment. Further, in the present embodiment, the ink familiar operation is performed as necessary only when performing plate making, that is, only before starting printing with a new stencil sheet.
When printing is interrupted for a long time, it may be possible to perform the ink familiar operation as needed when printing is restarted.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a rotary printing press according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the printing machine of FIG. The state when the ink roller is at the upper position during non-printing is shown.

FIG. 3 is an enlarged view of a main part similar to FIG. The state when the ink roller is at the lower position during non-printing is shown.

FIG. 4 is an enlarged view of a main part similar to FIG. Indicates the status during printing.

FIG. 5 is a configuration diagram of a main part of a conventional rotary stencil printing machine.

[Explanation of symbols]

1 Thin-walled plate cylinder type rotary stencil printing machine 2 Device main body 4 Paper feed section 6 Paper ejection section 8 Printing paper 10 Plate cylinder 13 Inner peripheral surface 20 Fixing plate 22 Shaft support section 24 Projection section (ink roller moving means, stopper member) 26 Movable Plate (ink roller moving means, ink roller supporting member) 28 Spring locking projection 30 Coil spring (ink roller moving means, biasing member) 32 Motor (ink roller moving means, bias releasing means) 34 Rotating cam (ink roller moving) Means, bias release means) 34a, 34b cam surface 36 spring locking plate (ink roller moving means, bias release means) 36a end portion 36b through hole 38 micro switch 39 contact arm 40 ink roller (ink supply means) 42 doctor roller (Ink supply unit) 44 Ink supply unit (Ink supply unit) 46 Ink 50 Press roller 52 Support point 60 Conveyance mechanism 62 Paper feed ring 64 Conveyance Road 70 print mechanism 100 control device (control means)

Claims (6)

[Claims] 1. A thin plate cylinder (10) and an ink roller (40) for supplying ink (46) to an inner peripheral surface (13) of the plate cylinder (10).
Ink supply means (40, 42, 44) including
A non-printing device is provided, which is provided with a press roller (50) which is opposed to the ink roller (40) with the (10) interposed therebetween, and which is provided so as to come into contact with and separate from the plate cylinder (10) and the ink roller (40). At times, the press roller (50), the plate cylinder (10), and the ink roller (40) are separated from each other, and at the time of printing, the press roller (50) is pressed against the plate cylinder (10), whereby the plate The body 10 is elastically deformed and the ink roller is
In the thin plate cylinder type rotary stencil printing machine (1) in contact with (40), the ink roller (40) is moved to the plate cylinder (1) at the time of non-printing.
0) the ink roller moving means (24, 26, 30, 32, 32) for moving from a normal position away from the inner peripheral surface (13) to a contact position in contact with the inner peripheral surface (13) of the plate cylinder (10). 34,
36) and whether or not the ink familiar operation is necessary based on the ink state of the plate cylinder (10), and when it is determined that the ink familiar operation is necessary, the ink roller movement is performed before printing. The plate cylinder (10) is rotated for a predetermined time while operating the means (24, 26, 30, 32, 34, 36).
The ink familiarizing operation of replenishing the ink (46) with (10) is performed, and after the ink familiarizing operation is completed, the operation of the ink roller moving means (24, 26, 30, 32, 34, 36) is stopped to perform the above operation. A thin plate cylinder type rotary stencil printing machine comprising a control means (100) for returning the ink roller (40) to the normal position. 2. The press roller (50) is arranged on the lower side and the ink roller (40) is arranged on the upper side with the plate cylinder (10) interposed therebetween, and the ink roller moving means (24, 26, 30, 32, 34,
36) is a support for the ink roller (40)
(40) is movably supported so as to be able to come into contact with and separate from the inner peripheral surface (13) of the plate cylinder (10), and in a natural state, the ink roller (40) descends to move the plate cylinder (13). An ink roller supporting member (26) which is in contact with the inner peripheral surface (13) of (10), and is provided so as to abut the ink roller supporting member (26) to prevent movement of the ink roller supporting member (26), A stopper member (24) dimensioned so that the ink roller (40) is in the normal position when the ink roller support member (26) comes into contact with the ink roller support member (26) The ink roller support member (26) is replaced with the stopper member (24).
A biasing member (30) for contacting the ink roller supporting member (26) with the biasing member (28).
2. The thin plate cylinder type rotary stencil printing machine according to claim 1, further comprising urging releasing means (32, 34, 36) for releasing urging force for urging the stopper member (24). 3. A thin plate cylinder (10) and an ink roller (40) for supplying ink (46) to an inner peripheral surface (13) of the plate cylinder (10).
Ink supply means (40, 42, 44) including
A non-printing device is provided, which is provided with a press roller (50) which is opposed to the ink roller (40) with the (10) interposed therebetween, and which is provided so as to come into contact with and separate from the plate cylinder (10) and the ink roller (40). At times, the press roller (50), the plate cylinder (10), and the ink roller (40) are separated from each other, and at the time of printing, the press roller (50) is pressed against the plate cylinder (10), whereby the plate The body 10 is elastically deformed and the ink roller is
A method for performing an ink familiarizing operation in a thin plate cylinder type rotary stencil printing machine (1) in contact with (40), wherein the press roller is used when the ink familiarizing operation is required.
(50) is the plate cylinder (10) and the ink roller (40)
With respect to the inner peripheral surface (13) of the plate cylinder (10) from the normal position where the ink roller (40) is separated from the inner peripheral surface (13) of the plate cylinder (10) in the non-press contact state. And the plate cylinder (10) is rotated,
The first step of performing an ink familiarization operation for supplying ink to the plate cylinder (10), and the ink roller (40) with respect to the inner peripheral surface (13) of the plate cylinder (10) after the ink familiarization operation. A second step of returning to the normal position where the non-contact state is established, and a method for operating the ink familiar to a thin plate cylinder type rotary stencil printing machine. 4. The first step is the time elapsed from the end of the previous printing, the ink temperature, the ink ambient temperature inside the plate cylinder, the previous number of prints, and whether or not the ink familiar operation was performed before the previous printing. Based on at least one factor of the total number of printed sheets in the previous and previous previous plate making, characterized by determining whether the ink familiar operation is required
The ink familiar operating method of the thin plate cylinder type rotary stencil printing machine according to claim 3. 5. The first step is the time elapsed from the end of the previous printing, the ink temperature, the ink ambient temperature inside the plate cylinder, the previous number of prints, and whether or not the ink familiar operation was performed before the previous printing. 4. The thin plate cylinder type rotary stencil printing press according to claim 3, wherein the operating condition of the ink familiar operation is changed based on at least one factor of the total number of printed sheets in the previous and previous previous plate making. Ink familiar operating method. 6. After carrying out the ink familiarizing method according to claim 3, 4 or 5, the press roller (50) is attached to the plate cylinder (10) and the ink roller (40) for at least the first sheet. A printing operation method for a thin-walled rotary stencil printing press, which is characterized in that printing is performed with a pressure contact force that is larger than usual.