JP2001162916A - Mimeographic printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To do idling in a short time without wasting stencil paper in printing after printing operation has been stopped for a long time. SOLUTION: In a cam mechanism which brings a cam piece 32 set on a paper cylinder 7 into the clamp action and lifting action of printing paper, a cam 33 is moved so that a printing position for a cam follower roller 34 to contact a left flat part 35, a right flat part 36, a small-diameter part 37, and a largediameter part 39 and an idling position for the roller 34 to contact only the small-diameter part are obtained. Engraved stencil paper M is wound onto a plate cylinder 6, or with previously used stencil paper M wound onto the plate cylinder 6, the cam 33 is arranged at the idling position, with printing paper P supplied to the paper cylinder 7 supported by the clamp piece 32, the rotation of the plate cylinder 6 and the paper cylinder 7 are repeated prescribed times. In this way, idling is done using the stencil paper M used usually in printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus for obtaining a normal printed image by making the transfer state of ink to printing paper uniform when printing is performed from a state where the printing operation is not performed for a long time. Things.

[0002]

2. Description of the Related Art Generally, a stencil printing apparatus has a plate cylinder provided with a cylindrical peripheral wall which is permeable to ink and rotatable around its own central axis. Then, the stencil sheet made by the stencil is wound around the plate cylinder, and the printing paper fed from the paper supply unit is pressed against the printing drum between the printing drum and the plate cylinder, whereby the stencil paper is attached to the printing paper. The desired print image is obtained by transferring the ink passing through the perforated portion.

[0003] In this type of stencil printing apparatus, if the printing operation is not performed for a long time, the state of the ink on the plate cylinder becomes uneven. Specifically, the ink existing on the inner and outer peripheral surfaces including the ink passage portion of the peripheral wall, between the stencil sheet used for the previous printing and the peripheral wall, etc., is dried, and the viscosity of the ink changes. . The viscosity of the ink used for printing also depends on the ambient temperature. Therefore, even when the ink is stored in a low temperature environment, the viscosity of the ink changes.

Thus, if printing is performed immediately after the stencil printing apparatus has been left for a long time, image blurring and the like are likely to occur. As a result, by the time the printed matter of the desired density is obtained, a large amount of printing paper having image blurring, which is usually called “bad paper”, will be output.

For this reason, in a conventional stencil printing apparatus, an unstenciled stencil sheet is wound around a printing drum, printing paper is not fed from a paper feeding unit, and the printing drum is rotated to press against the printing drum. By doing so, the ink of the plate cylinder is kneaded to make the state of the ink uniform. By doing so, it is possible to perform normal printing from the first sheet by improving the printing start.
In addition, by using unstenciled stencil paper, ink is not transferred to the paper cylinder side, so that the paper cylinder is not stained with ink. Further, as described above, the step of improving the printing start-up after being left for a long time is called idling.

[0006]

However, in the conventional stencil printing apparatus described above, when idling is performed, an unprinted stencil sheet is unprinted in order to prevent ink from being transferred to the paper cylinder side. Need to be wrapped around. This unstenciled stencil sheet is one stencil sheet used for normal printing, and is discarded after idling is completed. In other words, in order to perform idling, one stencil sheet for one plate has to be used, and there is a problem that the one stencil sheet for one plate is wasted for the user.

In the conventional stencil printing machine, as a step of idling, the stencil sheet used in the previous printing is peeled off from the plate cylinder, and the unstenciled stencil sheet is transported from the stencil making section and wound around the plate cylinder. The printing is performed only by peeling off the stencil sheet of the non-engraved stencil used after idling, transporting the stencil stencil used for new printing from the stencil making unit, and winding it around the plate cylinder. As described above, the conventional idling process requires a large number of processes because an unprinted stencil sheet is used, so that there is a problem that the user has a long waiting time.

Accordingly, in order to solve the above-mentioned problems, the present invention is to perform idling in a short time without printing a stencil sheet when printing from a state where the printing operation is not performed for a long time. It is an object of the present invention to provide a stencil printing machine that can perform the printing.

[0009]

According to a first aspect of the present invention, there is provided a stencil printing apparatus having an ink supply mechanism inside a cylindrical ink-permeable peripheral wall.
A plate cylinder that is rotatable about its own central axis and around which a stencil sheet is wound, and a paper feeding unit that conveys printing paper;
A paper cylinder having a clamp piece that is provided rotatably in synchronization with the rotation of the plate cylinder and that supports the printing paper supplied from the paper supply unit, and a clamp that performs an operation of supporting the printing paper by the clamp piece A drive mechanism, wherein the printing paper supplied to the paper cylinder is supported by the clamp pieces while the previously used stencil sheet is wound around the plate cylinder, In addition, the paper cylinder is rotated a predetermined number of times.

A stencil printing apparatus according to a second aspect of the invention has a stencil making section for making and conveying a stencil based on a desired image on a stencil sheet, and an ink supply mechanism inside a cylindrical ink-permeable peripheral wall. A plate cylinder around which the stencil paper is wound, which is rotatable around an axis, a paper feed unit for conveying printing paper, and a rotatable synchronously provided with the rotation of the plate cylinder, are provided so as to be rotatable. A paper cylinder having a clamp piece that supports the supplied printing paper, and a clamp drive mechanism that performs an operation of supporting the printing paper by the clamp piece, and wrapping the stencil sheet that has been made into a plate cylinder, The printing paper supplied to the paper cylinder is kept supported by the clamp pieces, and the plate cylinder and the paper cylinder are rotated a predetermined number of times.

According to a third aspect of the present invention, there is provided a stencil printing apparatus according to the first or second aspect, wherein a time measuring means for measuring an unprinted time since the last printing operation is performed; Alternatively, the printing apparatus further includes a control unit that controls the number of rotations of the plate cylinder and the paper cylinder in accordance with the time information measured by the clock unit prior to the printing process.

A stencil printing apparatus according to a fourth aspect is the stencil printing apparatus according to the first or second aspect, wherein a temperature detecting means for detecting a temperature in the plate cylinder or an ink temperature in the plate cylinder. And control means for controlling the number of revolutions of the plate cylinder and the paper cylinder in accordance with the temperature information detected by the temperature detecting means prior to plate making or printing processing.

A stencil printing apparatus according to a fifth aspect of the present invention is the stencil printing apparatus according to the first or second aspect, wherein the time keeping means measures the unprinted time since the last printing operation. Temperature detecting means for detecting the temperature in the plate cylinder or the ink temperature in the plate cylinder; time information measured by the time measuring means and temperature information detected by the temperature detecting means prior to plate making or printing processing. Control means for controlling the number of rotations of the plate cylinder and the paper cylinder in accordance with

The stencil printing apparatus according to claim 6 is the stencil printing apparatus according to any one of claims 1 to 5,
The clamp drive mechanism includes a cam provided without being involved in the rotation of the press drum, and a cam follower roller that slides on the cam in accordance with the rotation of the press drum, and the cam follower roller slides on the cam. Configured to perform an operation of supporting or releasing the printing paper by the clamp piece at a predetermined rotation position of the paper cylinder by an operation, and
It is characterized in that the cam is moved to change the sliding operation of the cam follower roller to the cam so that the operation of supporting the printing paper by the clamp piece is maintained.

[0015]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view showing an example of the stencil printing apparatus of the present invention, FIG. 2 is a side view showing a printing unit of the stencil printing apparatus, FIG. 3 is a front view showing a main part of the stencil printing apparatus, and FIG. 3 is a bottom view, and FIG. 5 is an operation diagram according to FIG.

In the stencil printing apparatus described below, when printing is performed from a state in which the printing operation is not performed for a long time, the ink is kneaded to improve the printing start and perform normal printing from the first sheet. This is to perform idling for making the state of the ink uniform.

As shown in FIG. 1, the stencil printing apparatus includes a printing unit 1, a stencil making unit 2, a paper feeding unit 3, a paper discharging unit 4, and a plate discharging unit 5.

First, the printing section 1 mainly has a plate cylinder 6 and a paper cylinder 7. The plate cylinder 6 is composed of two disk-shaped side plates 8 arranged at both ends, a rigid clamp base plate 9 connecting the two side plates 8 and being parallel to the axial direction, and a peripheral wall 10.

The peripheral wall 10 is formed by weaving a flexible wire made of a stainless steel wire or the like into a net shape. Accordingly, the peripheral wall 10 has flexibility, and allows the printing ink to pass therethrough.
Further, the peripheral wall 10 is wound around the outer peripheral surface of the side plate 8, one end of which is fixed to the clamp base plate 9, and the other end is connected to the crank base plate 9 via a spring. As described above, the peripheral wall 10 is arranged in a cylindrical shape along the outer peripheral surface of each side plate 8.

A clamp plate 11 serving as a clamp mechanism is rotatably mounted on the clamp base plate 9.
The clamp plate 11 clamps one end (tip) of the stencil sheet M. The leading end of the stencil sheet M is locked to the clamp base plate 9 by the clamp plate 11 and then wound around the outer peripheral surface of the peripheral wall 10.

The plate cylinder 6 is supported by a central cylinder shaft 12 so as to be rotatable around its own central axis. Gears (not shown) for driving the plate cylinder are formed on the outer peripheral portions of the two side plates 8, respectively, and mesh with driving gears of a plate cylinder drive motor (not shown). The plate cylinder 6 is rotationally driven in the counterclockwise direction in the figure by the plate cylinder drive motor with the center cylinder shaft 12 as a fixed support shaft.

In the plate cylinder 6, an inner frame 13 supported by a center cylinder shaft 12 is fixedly arranged. Inner frame 13
Supports a roller support arm 15 via a pivot 14 so that the roller support arm 15 can swing substantially vertically. The roller support arm 15 forms a support that rotatably supports the intermediate pressing roller 16 at an intermediate portion thereof. The intermediate pressing roller 16 is
The plate cylinder 6 extends in parallel to the central axis of the plate cylinder 6, and its outer peripheral surface is
0 is in sliding contact with the inner peripheral surface. The intermediate pressing roller 16 is made of an elastic material such as rubber.

The intermediate pressing roller 16 is used for the peripheral wall 1 as follows.
It also functions as a squeegee roller that is a part of an ink supply mechanism that supplies ink to the inner peripheral surface of the ink cartridge. The roller support arm 15 fixedly supports a doctor rod 17 extending parallel to the outer peripheral surface of the intermediate pressing roller 16 at a small interval. A wedge-shaped ink reservoir 18 is formed between the intermediate pressing roller 16 and the doctor rod 17. An ink delivery pipe (not shown) for metering ink to the ink reservoir 18 extends in the plate cylinder 6 in parallel with the center axis of the intermediate pushing roller 16 and the doctor rod 17. The ink delivery pipe communicates with the outside of the plate cylinder 6 via the central cylinder shaft 12 and is connected to an ink supply source (not shown) installed outside the plate cylinder 6. Then, the ink reservoir 1
The ink No. 8 is supplied to the inner peripheral surface of the peripheral wall 10 while being measured while passing through a minute interval with the doctor rod 17 by the rotation of the intermediate pressing roller 16 in the counterclockwise direction in the drawing.

A temperature sensor 48 is provided in the plate cylinder 6 as temperature detecting means. Temperature sensor 48
Is a device for directly or indirectly detecting the temperature in the plate cylinder 6 or the temperature of the ink in the plate cylinder 6, and is composed of, for example, a thermistor.

The inner frame 13 rotatably supports the cam shaft 19. A double heart-shaped plate cam 20 fixed to a cam shaft 19 and a link yoke member 2
And a cam follower roller 22 attached to the first cam mechanism. The linking yoke member 21 is connected to a swinging end of the roller support arm 15 by a pivot 23.

The cam shaft 19 is connected to a driven side of an electromagnetic clutch (not shown). The drive side of the electromagnetic clutch is connected to a gear (not shown) that meshes with an internal gear (not shown) fixed to the side plate 8 of the plate cylinder 6. The cam shaft 19 is selectively driven and connected to the gear by an electromagnetic clutch, and is driven to rotate as the plate cylinder 6 rotates.

The plate cam 20 moves the cam follower roller 22 by the rotation of the cam shaft 19 on the peripheral surface in contact with the cam follower roller 22. Linkage yoke member 21
Moves substantially vertically along with the movement of the cam follower roller 22, and moves the swinging end of the roller support arm 15 substantially vertically. As a result, the intermediate pressing roller 16 swells and deforms the peripheral wall 10 shown in FIG.
Is moved up and down to a steady position where the swelling deformation of the is released.

The center cylinder shaft 12 rotatably supports the intermediate portion of the roller drive arm 24 in the plate cylinder 6. One end of the roller drive arm 24 rotatably supports the intermediate gear 25. The other end of the roller drive arm 24 is connected to the inner frame 13 via a tension spring 26 and is urged in the counterclockwise direction in the figure by the spring force of the tension spring 26.
With this bias, the intermediate gear 25 always meshes with the above-mentioned internal gear and the gear 27 provided concentrically at the end of the intermediate pressing roller 16. That is, the intermediate gear 25 is rotated with the rotation of the plate cylinder 6 to rotate the intermediate pressing roller 16 in the counterclockwise direction in the figure, that is, in the same direction as the plate cylinder 6.

When the clamp base plate 9 and the like come into contact with the paper cylinder 7 during rotation of the plate cylinder 6, a cam (not shown) provided on the side plate 8 and an end of the intermediate pressing roller 16 are connected via a gear 27. The intermediate push roller 16 at the swelling deformation position is lifted by engagement of a cam follower roller (not shown) provided. This protects the peripheral wall 10 by avoiding the contact of the intermediate pressing roller 16 with the inner peripheral surface side of the peripheral wall 10 inside the clamp base plate 9 and protects the peripheral wall 10 from a corner of a concave portion 29 of the paper cylinder 7 described later. The collision of the intermediate pushing roller 16 is avoided to prevent the generation of a collision sound.

The paper cylinder 7 is made of an inelastic material such as metal and has the same outer diameter as the plate cylinder 6. This paper cylinder 7
Are provided in parallel with the plate cylinder 6 at a predetermined distance from the peripheral wall 10 by a central axis 28. The paper cylinder 7 is rotatable in a clockwise direction opposite to the plate cylinder 6. Further, the paper cylinder 7 has a concave portion 29 for avoiding interference with the clamp plate 11 for clamping the stencil sheet M on the plate cylinder 6 and the clamp base plate 9 when rotating itself.

The paper cylinder 7 is provided with a paper clamp member 30. One end of the paper clamp member 30 is fixed to a pivot 31 arranged in parallel with the central axis of the paper cylinder 7.
It is mounted so as to be able to swing. Further, the pivot 31 is provided with a clamp piece 32 which cooperates with the outer peripheral surface of the paper cylinder 7 to clamp (support) the printing paper P in a detachable manner.

The paper cylinder 7 is provided with a second cam mechanism for operating the clamp piece 32 to clamp or release the printing paper P. The second cam mechanism
It comprises a substantially half-moon-shaped cam 33 fixedly arranged without being involved in the rotation of the paper cylinder 7, and a cam follower roller 34 provided at the other end of the paper clamp member 30.

The outer periphery of the substantially half-moon-shaped cam 33 is formed by a cam portion 38 formed by a left flat portion 35, a right flat portion 36 and a small diameter portion 37 in FIGS. 1 and 2, and a large diameter portion 39. I have. The left flat portion 35 of the cam portion 38 substantially extends in the tangential direction of the small diameter portion 37, and the right flat portion 36 forms a step with the small diameter portion 37. The small-diameter portion 37 has a circular outer peripheral surface concentric with the paper cylinder 7, and protrudes from the left flat portion 35 and the right flat portion 36 in the direction of its own central axis as shown in FIG. Are located. The cam follower roller 34 is
When the paper cylinder 7 rotates, it comes into sliding contact with the large-diameter portion 39, which is the outer peripheral surface of the substantially half-moon-shaped cam 33, and engages with the cam portion 38.

As shown in FIG. 3, the cam 33 is substantially L
It is fixed to one plate body 40a of the U-shaped support member 40. The support member 40, as shown in FIG.
A plurality (three places in FIG. 4) of elongated holes 41 formed along the center axis direction of the cam 33 are formed in Ob. The elongated hole 41 is engaged with a support projection 42 provided on a frame (not shown) on the side of the stencil printing apparatus fixedly provided. A rack gear 43 is provided on a side edge of the other plate 40b of the support member 40. The rack gear 43 is meshed with a drive gear 45 provided on an output shaft of a drive motor 44. That is, the support member 40 is
The drive of 4 allows the cam 33 to move in the direction of the center axis of the cam 33 with respect to the support protrusion 42, whereby the cam 33 moves in the direction of its own center axis.

When the cam 33 is moved, the cam portion 38 (left flat portion 35, right flat portion 36, small diameter portion 37) and large diameter portion 39 are moved relative to the cam follower roller 34 in the paper clamp member 30. Printing position A that slides continuously
(Shown in FIG. 3) and an idling position B (shown in FIG. 5) where only the small diameter portion 37 slides. This cam 33
The printing position A and the idling position B are detected by an optical cam sensor 47 that detects a detection piece 46 in a part of the support member 40 that has moved.

When the cam 33 is at the printing position A, the clamp piece 32 clamps the printing paper P at the small diameter portion 37 and prints at the large diameter portion 39 by the sliding contact of the cam follower roller 34 due to the rotation position of the paper cylinder 7. The clamp of the device P is released. The left flat portion 35 is a portion where the cam follower roller 34 reaches from the large-diameter portion 39 to the small-diameter portion 37, and is a paper biting position where the clamp piece 32 clamps the leading end of the printing paper P. The right flat portion 36 is a portion where the cam follower roller 34 reaches from the small diameter portion 37 to the large diameter portion 39, and is a sheet release position where the clamp piece 32 releases the clamp of the printing paper P. The operation of the clamp piece is an operation during normal printing.

On the other hand, when the cam 33 is at the idling position B, the cam follower roller 34 slides due to the rotation of the paper cylinder 7 so that the clamp piece 32 clamps the printing paper P when the paper cylinder 7 rotates. Becomes

The timing at which the cam 33 moves between the printing position A and the idling position B is when the cam follower roller 34 is at the position shown in FIG. .

As described above, by the configuration relating to the cam 33 and the cam follower roller 34 and the configuration for moving the cam 33, the operation of the clamp piece 32 is performed during normal printing, and the clamp piece 32 clamps the printing paper P. (support)
Thus, a clamp driving mechanism that performs the operation of maintaining the clamp is obtained.

Next, the stencil making section 2 is constituted by a stencil roll section 50 in which a heat-sensitive stencil sheet M made of a continuous sheet is stored in a roll form, and a plurality of point heating elements arranged in a horizontal line. Thermal head 51, a platen roller 52 disposed opposite to the thermal head 51, a stencil feed roller 53, a stencil guide roller 54, and a stencil cutter 55.
And

The stencil making section 2 feeds the stencil sheet M pulled out from the stencil roll section 50 by sandwiching the stencil sheet M between the thermal head 51 and the platen roller 52 by the rotation of the platen roller 52. Image information on an image of a document read by an image sensor (not shown) is input to the thermal head 51. The thermal head 51 selectively operates each of the point heating elements individually and individually in accordance with the image information, and the stencil sheet M
Then, a heat-sensitive perforation plate making in a dot matrix is performed. The document guide roller 54 is provided with a silicon damper or the like serving as a tension applying mechanism at a shaft portion thereof, and appropriately applies tension to the stencil sheet M sent between the thermal head 51 and the platen roller 52. The stencil feed roller 53 sends the stencil sheet M, which has been made, to the plate cylinder 6 side. The stencil sheet M that has been made is cut by the stencil cutter 55 into one plate. The image information input by the stencil making unit 2 includes stamp size data on the stamp to be printed on the stencil sheet M that has been made.

Next, the paper supply section 3 has a paper supply table 56 on which the printing paper P is loaded. Printing paper P on paper feed table 56
Are taken out one by one by a paper feed roller 57 and a paper separating roller 58. The taken out printing paper P is fed to the timing roller pair 60 via the upper and lower paper guide members 59.
To the nip. Timing roller pair 60
Sends the printing paper P to the paper biting position by the clamp piece 32 of the paper cylinder 7 at a predetermined timing. Also,
The paper feed unit 3 has an optical paper feed sensor 61 that detects that the printing paper P has been sent to the paper feeding position.

Next, the paper discharge unit 4 has a paper discharge pinch roller 62 that is disposed at the paper release position and discharges and conveys the printed printing paper P by the pinch roller function cooperating with the paper cylinder 7. I have. Further, the paper discharge unit 4 has a paper separation claw 63 that separates the printing paper P from the paper cylinder 7 when the paper cylinder 7 rotates. The printing paper P separated from the paper cylinder 7 by the paper separating claw 63 is sent out to the printing flying table 65 by a pair of paper ejection pinch rollers 64. Further, the printing paper P is blown to the paper discharge board 66 by the inclination 65a of the print flying board 65. In addition, the paper discharge unit 4 has an optical paper discharge sensor 67 that detects that the printing paper P has flown from the print flying table 65 toward the paper discharge table 66.

The upper rollers of the discharge pinch roller 62 and the discharge pinch roller pair 64 are in sliding contact with the upper surface of the discharged print paper P, that is, the print image surface. However, since each of the rollers 62 and 64 comes into sliding contact only with the margins (non-print margins) on both sides of the printing paper P,
The ink transferred to the printing paper P does not appear on them. Each of the rollers 62 and 64 has a size corresponding to the size of the printing paper P set on the paper supply table 56 so that the rollers 62 and 64 are in sliding contact only with the margins on both sides of the printing paper P regardless of the width dimension of the printing paper P. The position in the axial direction is automatically adjusted accordingly. For this reason,
The paper feed table 56 is provided with a paper size sensor 74 for detecting the size of the print paper P.

Next, the plate discharging section 5 has a plate discharging separation claw 68 for peeling the used stencil sheet M wound around the outer peripheral surface of the plate cylinder 6 from the plate cylinder 6. When the stencil sheet M is peeled off from the plate cylinder 6, the clamp of the stencil sheet M by the clamp plate 11 is released, and the end of the stencil sheet M opened with the rotation of the plate cylinder 6 is separated by the stencil separation claw 68. Try to catch. The stencil sheet M caught on the plate discharge separation claw 68 is
Further rotation of the plate cylinder 6 causes the plate cylinder 6 to be peeled off from the outer peripheral surface thereof. The stencil sheet M peeled off by the plate discharge separation claws 68 is conveyed by a plate discharge roller pair 69 and stored in a plate discharge box 70.

At the entrance of the stencil discharge box 70, a photoelectric discharge sensor 71 for detecting that the stencil sheet M has been fed into the stencil discharge box 70 is provided. Further, the stencil discharge box 70 is supported by a support 72 so as to be able to be taken out of the stencil printing apparatus in order to discard the stencil sheet M accumulated inside. The plate discharging box 70 is the support 7
2 is set to the plate discharge box set switch 7
3 is detected.

FIG. 6 shows an embodiment of a control system of the stencil printing apparatus. This control system has a storage means 80 such as a ROM storing a control program, a RAM for storing input information and the like as needed, and a control means (CPU) 81 constituted by a microprocessor or the like.

The storage unit 80 stores data on the time during which the stencil printing apparatus has been left, and data on the number of presses with respect to the ink temperature in the form of a table.

The control means 81 includes a time measuring means 82, a comparing and discriminating means 83, a temperature discriminating means 84, and a pressing frequency determining means 8.
5. A size discriminating means 86 is provided.

The time counting means 82 is restarted, for example, every time the rotation of the plate cylinder 6 is stopped. The time period of the stencil printing apparatus, that is, the time from the end of the previous printing operation to the time when a new next printing is performed, is performed. It consists of an internal timer that counts time.

The comparing / determining means 83 compares the counted time data counted by the counting means 82 with preset time data (for example, 6 hours) to determine the magnitude of the data.

The temperature discriminating means 84 discriminates the temperature in the plate cylinder 6 or the ink temperature data in the plate cylinder 6 from the detection signal of the temperature sensor 48.

The number-of-presses determining means 85 reads out the number-of-presses data from the storage means 80 in accordance with the result of the comparison judgment by the comparison judgment means 83. The read number-of-presses data is determined as the number of times of printing, that is, the number of times the plate cylinder 6 and the paper cylinder 7 rotate.

The number-of-presses determining means 85 reads out from the storage means 80 the number-of-presses data corresponding to the temperature data obtained by the determination by the temperature determining means 84. The read number-of-presses data is determined as the number of times of printing, that is, the number of times the plate cylinder 6 and the paper cylinder 7 rotate.

The size discriminating means 86 compares, as image information, the stamp size data on the stamp surface to be printed on the stencil sheet M, and the sheet size data from the sheet size sensor 74 of the sheet feeding section 3. ing.

In this control system, input from the operation panel 88,
Alternatively, the cam sensor 47, the paper feed sensor 61, the paper discharge sensor 67, the plate discharge sensor 71, and other various sensors (not shown) provided in each section and the signals output from the switches are input, and the plate cylinder 6 is executed by executing the control program. The main control of the operations of the printing unit 1, the plate making unit 2, the paper feeding unit 3, and the paper discharging unit 5 is mainly performed. In particular, the control system according to the present embodiment
In, a drive circuit 87 for driving the drive motor 44 for moving the cam 33 is controlled, and the movement of the cam 33 is switched.

As shown in FIG. 6, the operation panel 88 has a plate making start key 8 for instructing execution of plate making.
9, a prepress / print auto key 90 for instructing execution of a series of prepress / print operations, a print start key 91 for instructing execution of printing, and an idling key 92 for instructing execution of idling. The operation panel 88 has a display 93 such as an LCD for displaying the number of prints set by a ten-key (not shown) and other various messages.

Hereinafter, each idling operation in the stencil printing apparatus will be described with reference to the flowcharts of the respective drawings.

First, auto idling for automatically performing idling will be described. In this auto-idling, the control means 81 determines in advance whether or not to perform the auto-idling and the number of times of the pressing process when the auto-idling is performed as follows.

The first is that the time counting unit 82 counts the idle time of the stencil printing apparatus, and the comparison determining unit 83 compares the set time data, and the set time at which auto idling should be performed has elapsed. It is determined that there is. Thus, it is determined that the auto idling is performed. Then, the number-of-presses determining means 85 causes the comparison determining means 83
Is determined in accordance with the set time.

Second, the temperature in the plate cylinder 6 or the ink temperature data in the plate cylinder 6 obtained by the temperature sensor 48 is determined by the temperature determining means 84. If this temperature is equal to or lower than the set temperature, it is determined that the auto idling is performed. Then, the number-of-presses determining means 85 determines the number of times N of the pressing process according to the temperature data obtained by the determination by the temperature determining means 84.

As described above, in the stencil printing apparatus, either the determination based on the standing time or the determination based on the temperature may be used, or both may be used.

FIG. 7 is a flowchart showing a first example of the auto idling operation. First, in order to perform plate making or plate making printing, when either the plate making start key 89 or the plate making / printing auto key 90 is turned on (ST1-YE).
S), a stencil sheet M that has been used up to that time is subjected to a plate discharging process (ST2). In other words, the used stencil sheet M wound around the outer peripheral surface of the plate cylinder 6 and peeled off is peeled off from the plate cylinder 6 and fed into the plate discharge box 70 to discharge the plate.

The plate making start key 89 or plate making
When any one of the print auto keys 90 is turned on, a message indicating that the idling operation is to be performed is displayed on the display, and the operator is notified that idling is to be performed.

Further, the plate making start key 89 or plate making
If any of the print auto keys 90 are not turned on (ST
1-NO), and waits until either the plate making start key 89 or the plate making / printing auto key 90 is turned on.

Thereafter, the stencil sheet M is made (ST
3). That is, the stencil sheet M is subjected to a stencil making process by the stencil making section 2 and the stencil sheet M is conveyed to the plate cylinder 6 side. Then, the leading end of the stencil sheet M which has been conveyed is clamped by the clamp plate 11, and the stencil sheet M is wound around the plate cylinder 6 by rotation of the plate cylinder 6 to form a plate.

Thereafter, the printing paper P is fed (ST
4). That is, one print sheet P on the sheet supply table 56 is taken out and transported to the nip portion of the timing roller pair 60.

Thereafter, the printing paper P is clamped to the paper cylinder 7 (ST5). That is, the timing roller pair 6
0 feeds the printing paper P to the paper feeding position by the clamp piece 32 of the paper cylinder 7 at a predetermined timing. In the paper cylinder 7, the cam 33 is located at the printing position A, and clamps the printing paper P with the clamp piece 32.

Thereafter, the cam 33 is switched (S
T6). That is, the cam 33 is moved by the drive control of the drive motor 44. Thus, the cam 33 at the printing position A moves to the idling position B. As a result, the cam follower roller 34 of the paper clamp member 30 comes into sliding contact with only the small-diameter portion 37, and when the paper cylinder 7 rotates, the clamp piece 3
2 remains in a state where the printing paper P is clamped.

Thereafter, press processing is performed (ST7). That is, the printing drum 6 and the printing drum 7 are rotated synchronously, and the stencil sheet M wound around the printing drum 6 and the printing paper P clamped on the printing drum 7 are pressed against each other. Since the stencil sheet M is made, the ink that has passed through the perforated portion is transferred to the printing paper P. Further, since the printing paper P is still clamped on the paper cylinder 7, it is not peeled off from the paper cylinder 7.

Thereafter, if the above-described press processing is performed N times as determined by the number-of-presses determining means 85 (ST8-YES), the cam 33 is moved by the drive control of the drive motor 44, and the idling position is set. The cam 33 at B is switched to the printing position A (ST9). Accordingly, the cam follower roller 34 of the paper clamp member 30
Are in sliding contact with portions other than the small-diameter portion 37, and the clamp piece 32 can release the printing paper P when the paper cylinder 7 rotates.

Further, the pressing process is performed by the number-of-presses determining means 8.
If the N times of press processing determined in 5 is not performed (ST8-NO), the above press processing is continuously performed.

Thereafter, the rotation of the paper cylinder 7 causes the printing paper P
Are released (ST10). That is, with the rotation of the paper cylinder 7, the clamp piece 32 reaches the paper release position where the clamp of the printing paper P is released, and releases the clamp.

Thereafter, a paper discharging process is performed (ST1).
1). That is, the printing paper P, the clamp of which has been released at the paper releasing position, is separated from the paper cylinder 7 by the paper separating claw 63 and is discharged to the paper discharge tray 66 via the print flying tray 65. The discharged printing paper P has been subjected to the above-described N printings by an idling process.

Thereafter, normal printing processing is performed using the stencil sheet M on which printing has been performed as described above (ST12). in this case,
Since the ink in the plate cylinder 6 is kneaded by the N number of pressing processes, normal printing is performed from the first printing.

As described above, in the first example of the auto-idling shown in FIG. 7, the stencil sheet M which has been newly made is subjected to idling operation.

FIG. 8 is a flowchart showing a second example of the auto idling operation. First, in order to perform plate making or plate making printing, when either the plate making start key 89 or the plate making / printing auto key 90 is turned on (ST21).
-YES), a process of discriminating the printing surface of the stencil sheet M used so far and the size of the printing paper P placed on the paper feed tray 56 is performed (ST22).

Note that the plate making start key 89 or plate making
When any one of the print auto keys 90 is turned on, a message indicating that the idling operation is to be performed is displayed on the display, and the operator is notified that idling is to be performed.

Further, the plate making start key 89 or plate making
If any of the print auto keys 90 are not turned on (ST
21-NO), and waits until either the master making start key 89 or the master making / printing auto key 90 is turned on.

If each size is printing paper P ≧ printing surface of stencil sheet M (ST23-YES), printing paper P is fed (ST24). That is, one print sheet P on the sheet supply table 56 is taken out and transported to the nip portion of the timing roller pair 60.

If each size is not the printing paper P ≧ the stencil sheet M stamped face (ST23-NO), the display 93 displays a printing paper exchange display (ST25), and the operator exchanges the printing paper P. (ST26). Then, when it is confirmed by the paper size sensor 74 that the new printing paper P has been placed on the paper feed table 56, it is determined again whether the printing paper P ≧ the stencil sheet M stamped, and the printing paper P ≧ the stencil sheet. If it is the base paper M stamp surface (ST23-YES), the printing paper P
(ST24).

Thereafter, the printing paper P is clamped on the paper cylinder 7 (ST27). That is, the timing roller pair 60 feeds the printing paper P to the paper feeding position by the clamp pieces 32 of the paper cylinder 7 at a predetermined timing. In the paper cylinder 7, the cam 33 is located at the printing position A, and clamps the printing paper P with the clamp piece 32.

Thereafter, the cam 33 is switched (S
T28). That is, the cam 33 is moved by the drive control of the drive motor 44. Thus, the cam 33 at the printing position A moves to the idling position B. This allows
The cam follower roller 34 of the paper clamp member 30 comes into sliding contact with only the small-diameter portion 37, and the clamp piece 32 remains clamped on the printing paper P when the paper cylinder 7 rotates.

Thereafter, press processing is performed (ST29).
That is, the printing drum 6 and the printing drum 7 are rotated synchronously, and the stencil sheet M wound around the printing drum 6 and the printing paper P clamped on the printing drum 7 are pressed against each other. Since the stencil sheet M is made, the ink that has passed through the perforated portion is transferred to the printing paper P. Further, since the printing paper P is still clamped on the paper cylinder 7, it is not peeled off from the paper cylinder 7.

Thereafter, if the above-described press processing is performed N times of press processing determined by the number-of-presses determining means 85 (ST30-YES), the cam 33 is moved by the drive control of the drive motor 44, and the idling position is set. The cam 33 at B is switched to the printing position A (ST31). Thereby, the cam follower roller 3 of the paper clamp member 30
4 comes into sliding contact with the portion other than the small diameter portion 37, and when the cylinder 7 rotates,
The clamp piece 32 can release the printing paper P.

Further, the press processing is performed by the number-of-presses determining means 8.
If the N pressing processes determined in 5 are not performed (ST30-NO), the above pressing process is continuously performed.

Then, the rotation of the paper cylinder 7 causes the printing paper P
Is released (ST32). That is, with the rotation of the paper cylinder 7, the clamp piece 32 reaches the paper release position where the clamp of the printing paper P is released, and releases the clamp.

Thereafter, a paper discharging process is performed (ST3).
3). That is, the printing paper P, the clamp of which has been released at the paper releasing position, is separated from the paper cylinder 7 by the paper separating claw 63 and is discharged to the paper discharge tray 66 via the print flying tray 65. The discharged printing paper P has been subjected to the above-described N printings by an idling process.

Thereafter, the used stencil sheet M on the plate cylinder 6 is discharged (ST34). In other words, the used stencil sheet M wound around the outer peripheral surface of the plate cylinder 6 and peeled off is peeled off from the plate cylinder 6 and fed into the plate discharge box 70 to discharge the plate.

Then, the stencil sheet M is made (ST3).
5). That is, the stencil sheet M is subjected to a stencil making process by the stencil making section 2 and the stencil sheet M is conveyed to the plate cylinder 6 side. Then, the leading end of the stencil sheet M which has been conveyed is clamped by the clamp plate 11, and the stencil sheet M is wound around the plate cylinder 6 by rotation of the plate cylinder 6 to form a plate.

Thereafter, normal printing processing is performed using the stencil sheet M on which printing has been performed as described above (ST36). in this case,
Since the ink in the plate cylinder 6 is kneaded by the N number of pressing processes, normal printing is performed from the first printing.

As described above, in the second example of the auto-idling shown in FIG. 8, the idling operation is performed using the used stencil sheet M as it is.

FIG. 9 is a flowchart showing a third example of the auto idling operation. First, when the print start key 91 is turned on (ST41-YES) to print again on the stencil sheet M on which printing has been performed, the printing paper P is fed (ST42). That is, one sheet of the printing paper P on the paper feed table 56 is taken out, and the timing roller pair 60
To the nip.

When the print start key 91 is turned on, the fact that the idling operation is to be performed is displayed on the display, and the operator is notified that idling is to be performed.

If the print start key 91 is not turned on (ST41-NO), the process waits until either the plate making start key 89 or the plate making / printing auto key 90 is turned on.

Thereafter, the printing paper P is clamped on the paper cylinder 7 (ST43). That is, the timing roller pair 60 feeds the printing paper P to the paper feeding position by the clamp pieces 32 of the paper cylinder 7 at a predetermined timing. In the paper cylinder 7, the cam 33 is located at the printing position A, and clamps the printing paper P with the clamp piece 32.

Thereafter, the switching process of the cam 33 is performed (S
T44). That is, the cam 33 is moved by the drive control of the drive motor 44. Thus, the cam 33 at the printing position A moves to the idling position B. This allows
The cam follower roller 34 of the paper clamp member 30 comes into sliding contact with only the small-diameter portion 37, and the clamp piece 32 remains clamped on the printing paper P when the paper cylinder 7 rotates.

Thereafter, press processing is performed (ST45).
That is, the printing drum 6 and the printing drum 7 are rotated synchronously, and the stencil sheet M wound around the printing drum 6 and the printing paper P clamped on the printing drum 7 are pressed against each other. Since the stencil sheet M is made, the ink that has passed through the perforated portion is transferred to the printing paper P. Further, since the printing paper P is still clamped on the paper cylinder 7, it is not peeled off from the paper cylinder 7.

After that, if the above-mentioned press processing is performed N times of press processing determined by the number-of-presses determining means 85 (ST46-YES), the cam 33 is moved by the drive control of the drive motor 44, and the idling position is set. The cam 33 at B is switched to the printing position A (ST47). Thereby, the cam follower roller 3 of the paper clamp member 30
4 comes into sliding contact with the portion other than the small diameter portion 37, and when the cylinder 7 rotates,
The clamp piece 32 can release the printing paper P.

Further, the press processing is performed by the number-of-presses determining means 8.
If the N pressing processes determined in 5 are not performed (ST46-NO), the above pressing process is continuously performed.

Thereafter, the printing paper P is
Is released (ST48). That is, with the rotation of the paper cylinder 7, the clamp piece 32 reaches the paper release position where the clamp of the printing paper P is released, and releases the clamp.

Thereafter, a paper discharging process is performed (ST4).
9). That is, the printing paper P, the clamp of which has been released at the paper releasing position, is separated from the paper cylinder 7 by the paper separating claw 63 and is discharged to the paper discharge tray 66 via the print flying tray 65. The discharged printing paper P has been subjected to the above-described N printings by an idling process.

Thereafter, a normal printing process is performed using the stencil sheet M on which printing is currently performed (ST50). in this case,
Since the ink in the plate cylinder 6 is kneaded by the N number of pressing processes, normal printing is performed from the first printing.

As described above, in the third example of the auto-idling shown in FIG. 9, the idling operation is performed using the stencil sheet M on which the stencil sheet M for reprinting has been applied.

By the way, according to the first to third examples of the above-described auto idling, when idling is performed manually, before the plate making start key 89, the plate making / printing auto key 90, and the printing start key 91 are turned on, The idling key 92 may be turned on.

Therefore, in the stencil printing apparatus thus configured, when idling is performed, the printing paper P clamped on the paper cylinder 7 is kept clamped, and the press processing is performed to use the printing paper P for printing from now on. It is possible to perform idling using the stencil sheet M that has been made for printing and the used stencil sheet M that has been used for printing. Therefore, the stencil sheet M which is not made in a stencil sheet is not used unlike the related art, so that the stencil sheet M can be prevented from being wasted.

In addition, since idling using the used stencil sheet M can be performed, idling can be performed before reprinting is performed. Conventionally, idling at the time of reprinting cannot be performed because unprinted stencil paper M must be used.

Further, with respect to idling using the stencil sheet M that has been made and idling at the time of reprinting, since the stencil sheet M to be printed is used, the ink is sufficiently adapted to the stencil sheet M. Suitable printing can be performed from the first edition. In particular, in idling using the stencil sheet M that has been made, fine wrinkles on the stencil sheet M generated at the time of stencil can be extended by several times of press processing, so that a good printed image can be obtained.

Further, in the stencil printing apparatus, the idling operation does not use the unstenciled stencil sheet M. Therefore, it is possible to omit the stencil printing operation (for the unstenciled stencil sheet) of the stencil sheet M, and to reduce the number of idling steps. It is possible to reduce the time required for idling by reducing the pressure.

[0110]

As described above, the stencil printing apparatus according to the first aspect of the present invention is a stencil printing machine according to the present invention, in which the stencil sheet previously used is wound around the plate cylinder, and the printing paper supplied to the cylinder is discharged. By rotating the press cylinder in synchronization with the rotation of the plate cylinder while being supported by the clamp pieces, a press process for idling can be performed using the used stencil sheet used previously. This means that you will have to discard
Only one sheet of printing paper is used, and the ink in the plate cylinder can be kneaded without wastefully using the stencil sheet.

Further, since idling using the used stencil sheet can be performed, idling can be performed before reprinting is performed.

In the stencil printing machine according to the second aspect, the stencil sheet made by stencil is wound around the plate cylinder, the printing paper supplied to the cylinder is kept supported by the clamp pieces, and the stencil printing machine is synchronized with the rotation of the plate cylinder. By rotating the paper cylinder, press processing for idling can be performed using the stencil sheet made.
As a result, only one sheet of printing paper is discarded, and the ink in the plate cylinder can be kneaded without wastefully using the stencil sheet.

In addition, since the stencil sheet made by stencil is pressed several times by idling using the stencil sheet, the fine wrinkles on the stencil sheet generated at the time of plate-making can be extended. And can obtain a perfect printed image.

A stencil printing apparatus according to a third aspect of the present invention is provided with a stencil printing apparatus which includes a time keeping means for measuring the unprinted time since the last printing operation, and according to the time information measured by the time keeping means. By controlling the rotation speeds of the cylinder and the paper cylinder, idling based on the lapse of a predetermined time during which printing is not performed can be performed.

The stencil printing apparatus according to the fourth aspect is provided with temperature detecting means for detecting the temperature in the plate cylinder or the ink temperature in the plate cylinder, and according to the temperature information detected by the temperature detecting means, By controlling the number of rotations of the plate cylinder and press cylinder,
Idling can be performed based on the temperature in the plate cylinder or the ink temperature in the plate cylinder.

A stencil printing apparatus according to a fifth aspect of the present invention provides a stencil printing apparatus, comprising: a time measuring means for measuring an unprinted time since the last printing operation; and a temperature for detecting the temperature in the plate cylinder or the ink temperature in the plate cylinder. Detecting means for controlling the number of rotations of the plate cylinder and the paper cylinder in accordance with the time information measured by the time measuring means and the temperature information detected by the temperature detecting means, so that the predetermined printing is not performed. Precise idling can be performed based on the passage of time and the temperature in the plate cylinder or the ink temperature in the plate cylinder.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a stencil printing apparatus of the present invention.

FIG. 2 is a side view showing a printing unit of the stencil printing apparatus.

FIG. 3 is a front view showing a main part of the stencil printing apparatus.

FIG. 4 is a bottom view according to FIG. 3;

FIG. 5 is an operation diagram according to FIG. 3;

FIG. 6 is a block diagram showing an embodiment of a control system of the stencil printing apparatus.

FIG. 7 is a flowchart showing a first example of an auto idling operation.

FIG. 8 is a flowchart showing a second example of the auto idling operation.

FIG. 9 is a flowchart showing a third example of the auto idling operation.

[Explanation of symbols]

2 ... plate making section, 3 ... paper feeding section, 6 ... plate cylinder, 7 ... paper cylinder, 10 ...
Peripheral wall, 32: clamp piece, 33: cam, 34: cam follower roller, 48: temperature sensor (temperature detecting means), 81
... Control means, 82 ... Time measuring means, M ... Stencil sheet, P ... Print paper.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B41F 31/02 S

Claims (6)

[Claims] An ink supply mechanism is provided inside a cylindrical ink-permeable peripheral wall. The ink supply mechanism is rotatable around its own central axis, and transports a printing cylinder on which a stencil sheet is wound and a printing paper. A paper supply unit, a paper cylinder having a clamp piece that is provided rotatably in synchronization with the rotation of the plate cylinder, and that supports the print paper supplied from the paper supply unit; and And a clamp drive mechanism for performing a supporting operation, wherein the printing paper supplied to the paper cylinder is supported by the clamp pieces while the previously used stencil sheet is wound around the plate cylinder. A stencil printing machine wherein the plate cylinder and the paper cylinder are rotated a predetermined number of times. 2. A stencil making section for performing stencil making on a stencil sheet with a desired image and transporting the stencil sheet, and an ink supply mechanism inside a cylindrical ink-permeable peripheral wall, which is rotatable around its own central axis. A plate cylinder around which the stencil sheet is wound, a paper feeding unit for transporting printing paper, and a clamp rotatably provided in synchronization with the rotation of the plate cylinder, and supporting the printing paper supplied from the paper feeding unit. And a clamp drive mechanism for supporting the printing paper by the clamp piece. The stencil sheet produced is wound around the plate cylinder, and the printing supplied to the paper cylinder is provided. A stencil printing machine characterized in that the printing drum and the printing drum are rotated a predetermined number of times while the paper is supported by the clamp pieces. 3. A time counting means for counting an unprinted time since the last printing operation, and the plate cylinder and the plate cylinder according to time information counted by the time counting means prior to plate making or printing processing. The stencil printing apparatus according to claim 1, further comprising: a control unit configured to control a rotation speed of the paper cylinder. 4. A temperature detecting means for detecting a temperature in the plate cylinder or an ink temperature in the plate cylinder, and in accordance with temperature information detected by the temperature detecting means prior to plate making or printing processing. The stencil printing apparatus according to claim 1, further comprising: a control unit configured to control a number of rotations of the plate cylinder and the paper cylinder. 5. A time measuring means for measuring an unprinted time since the last printing operation, a temperature detecting means for detecting a temperature in the plate cylinder or an ink temperature in the plate cylinder, and the time measuring means. And control means for controlling the number of revolutions of the plate cylinder and the paper cylinder in accordance with the time information measured in the step (a) and the temperature information detected by the temperature detection means. A stencil printing apparatus according to claim 1 or claim 2. 6. The clamp driving mechanism includes a cam provided without being involved in the rotation of the press drum, and a cam follower roller that slides on the cam in accordance with the rotation of the press drum.
The cam follower roller is configured to perform a sliding operation of the cam follower roller on the cam to perform an operation of supporting or releasing the printing paper by the clamp piece at a predetermined rotation position of the paper cylinder, and move the cam to move the cam follower. The stencil plate according to any one of claims 1 to 5, wherein the stencil plate is configured to maintain a supporting operation of the printing paper by the clamp piece by changing a sliding contact operation of the roller with the cam. Printing device.