JPH0630948B2 - Stencil-making plate making machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stencil printing machine, and more particularly, to a stencil printing machine for controlling a tension value when winding a roll-shaped stencil sheet around a printing drum within a predetermined range. The present invention relates to a plate-making printing device.

(Prior Art) Conventionally, a plate-making printing apparatus having a plate making means for making a stencil sheet and a printing means for making a stencil sheet using the stencil sheet made by the plate making means is already known. For example, Japanese Patent Application No. 57-2072 filed by the same applicant as the present applicant
16 (Japanese Patent Laid-Open No. 59-46983) and Japanese Patent Application No. 58
The stencil-type stencil printing machine disclosed in Japanese Patent Laid-Open No. 19261/1982 (JP-A-59-143679) uses a roll-shaped stencil sheet, and one end of the roll-shaped stencil sheet is provided on the outer peripheral surface of a printing drum. After being locked by the clamp device, the plate is made by the plate making means, and the printing drum is rotated and wound around the drum surface for printing.

If the stencil sheet after the plate making is wound around the outer peripheral surface of the printing drum, it may be wound in a state where wrinkles are generated, and there is a problem that characters are missing or warped as a printing result.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and prevent the occurrence of wrinkles during wrapping of the stencil sheet around the outer peripheral surface of the printing drum after plate making, and the accompanying defects during printing. An object of the present invention is to provide a stencil-type plate-making / printing device capable of performing.

(Means for Solving Problems) The present invention has been made in view of the above points, and detects the tension value applied to the stencil sheet when winding the stencil sheet around the outer peripheral surface of the printing drum. When the detected value is outside the predetermined range, the tension applied to the stencil sheet is adjusted so as to be within the predetermined range so that the stencil sheet is wound around the outer peripheral surface of the printing drum without wrinkles. It was done. That is, the present invention includes a sandwiching portion that locks one end of a roll-shaped stencil sheet to the outer peripheral surface of the printing drum, a plate-making section that makes the plate of the perforated sheet, and the printing drum by rotating the printing drum at a predetermined angle. In a stencil-type stencil making apparatus having a printing unit for stencil printing by wrapping one plate of the stencil sheet stencil on the outer peripheral surface of the printing drum, while the printing drum is rotating by a predetermined angle, A detection unit that detects the tension of the stencil sheet between the sandwiching unit and the plate making unit, and determines whether the tension value detected by the detection unit is within a predetermined value range and generates a determination signal. And a tension adjusting means for adjusting the load of the stencil sheet when winding it on the outer peripheral surface of the printing drum so that the tension value is within a predetermined value range when the determination signal is outside the predetermined value range. Characterized by .

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an experimental apparatus necessary for measuring a tension value required for winding a stencil sheet without wrinkling on an outer peripheral surface of a printing drum of a stencil plate-making printing apparatus according to the present invention. It is a figure which shows an outline. This experimental device consists of a modified stencil type plate making and printing device "lithograph 007" manufactured by Riso Kagaku Kogyo Co., Ltd., which has a modified base paper supply unit (printing drum and base paper insertion stand). As shown in FIG. A roller 5 whose central axis is supported by a ball bearing 3 is attached to the tip of the base 1. After being configured in this manner, the lithographic stencil sheet 81 in a roll shape is formed by “lithographic 007
The master is cut into a certain length, one end of the base paper is attached to the clamp device 9 of the printing drum, and the other end is hung downward through the roller 5, and at the end thereof, the width equal to the width of the base paper is set. A rigid plate member 85 having a uniform thickness is attached, and a weight 87 is attached to the central position of the rigid plate 85 with a thread.
The paper is hung so that the weight is evenly applied in the width direction of the base paper (see FIG. 2). It should be noted that between the roller 5 and the clamp device 9 of the printing drum 7, there is no member that becomes a resistance to the base paper 81, and the roller 5 that comes into contact with the base paper is supported by the ball bearing 3 as described above. The rotation resistance can be almost ignored. In the figure, 83 is a press roller.

In this state, the printing drum was rotated at a constant speed to wind the base paper (master) around the surface of the printing drum, and after printing 10 sheets, it was observed whether or not wrinkles were directly generated on the base paper. In each experiment, the rotation speed of the printing drum when winding the stencil sheet was the same. The weight of the weight, which will be described later, is the sum of the weight of the weight suspended on the thread and the weight of the rigid plate member. The "lithographic 007 master" of the base paper 81 is a heat-sensitive stencil base paper (thermoplastic stencil film) obtained by bonding a thermoplastic synthetic resin film (polyester film) and a porous support (thin paper made of Manila hemp) with an adhesive (vinyl acetate adhesive). Width 270 mm x length 125
m) is rolled up. Table 1 shows the results of measuring the tension of the base paper and the occurrence of wrinkles by changing the weight of the weight variously.

From the above experiment, the tension required to wind the stencil sheet around the outer peripheral surface of the printing drum without wrinkles was 0.18 g.
It was found to be not less than / mm and not more than 1.78 g / mm.

The present invention is to maintain the tension of the stencil sheet to be wound around the printing drum at the time of printing in a value within a predetermined range where the wrinkle does not occur, and the stencil plate-making printing apparatus used in the present invention will be described in detail with reference to the drawings. explain.

FIG. 3 is a diagram showing an example of a plate-making printing apparatus to which the present invention is applied, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. First, in FIG. 3, an insertion opening 12 into which an original for plate-making printing is inserted is provided at one end of an upper portion of the apparatus main body 11, and an original table 1 for guiding the original is provided in the insertion opening 12.
3 is provided. A take-out port 14 for outputting the inserted document is provided at the center of the upper surface of the apparatus body 11, and a display operation unit 15 is provided at one side of the upper surface. The display operation unit 15 includes a power switch 16,
Plate-making start switch 17, print start switch 18, print stop switch 19, numeric keypad 20 for setting the number of prints, switch 21 for setting the print speed, switch 22 for adjusting the print position on the paper, switch 23 for designating confidential printing, plate-making , Switch 2 to specify continuous printing operation
4, a cover 25 of these switches 23 and 24, and a display unit 26 for displaying the number of sheets set by the ten keys 20.

Further, at the other end of the upper part of the apparatus main body 11 and the other side part, a plate discharge part 27 for discharging, for example, a printed plate-making paper (printing original plate) is provided.

Further, at the other end of the lower portion of the apparatus main body 11, a paper feed tray 28 on which printing paper is placed is provided, and at one end of the lower portion of the apparatus main body 11, a paper ejection tray 29 for ejecting the printed paper is provided. Has been.

Next, in FIG. 4, a tension detector 48 is provided between the plate cylinder 32 and the cutter 39 to detect a tension applied to the plate-making paper 33 when the plate cylinder 32 is wound around the outer peripheral surface of the plate cylinder 32. The tension detecting unit 48 has a function of electrically converting (for example, a voltage) the amount of movement of the contact of a tension gauge that is normally sold and sending it to a computer control unit CPU described later. Further, in the storage portion that rotatably and replaceably stores the roll-shaped plate-making paper 33, a resistance at the time of pulling out the roll-shaped plate-making plate 33 is based on the tension value detected by the tension detecting section 48. A tension adjusting section 49 is provided for adjusting the tension applied to the plate-making paper 33 wound around the outer peripheral surface of the plate cylinder 32 by changing the tension.

The storage part provided with this tension adjusting part 49 is
As shown in FIG. 5, the plate-making paper 3 is attached to the core (not shown).
A pair of disc-shaped side plates 50, 5 for protecting the end faces of
1 is integrally provided, and the plate-making paper 33 is wound around the core body between the pair of side plates 50 and 51. Further, hemispherical projections 54 are integrally provided on the tip surfaces of the protruding shafts 52 and 53 outside the side plates 51 and 52, respectively. Roll-shaped plate-making sheet 3 configured as described above
The pair of protruding shaft portions 52 and 53 of the three support rollers 5
5, 56 and 57 are rotatably received, and on the side surface of each hemispherical projection 54, there are spring piece portions 58 and 59 which are in sliding contact with the hemispherical projection 54 in order to regulate the movement to both sides. It is provided. An eccentric cam 60 that is in sliding contact with the side surface of the spring piece portions 58 and 59 and a motor 61 for rotating the eccentric cam 60 are provided to form a tension adjusting portion 49. That is, the tension adjusting section 49 rotates the eccentric cam 60 via the gear by the motor 61 to change the contact pressure of the spring piece portion 58 to the hemispherical projection 54, thereby rotating resistance of the roll-shaped plate-making sheet 33. By adjusting
The tension at the time of winding the plate-making paper 33 around the plate cylinder 32 is adjusted.

Next, the operation of the stencil-type plate-making printing apparatus having the above-mentioned configuration will be described. In FIG. 4, the same parts as those in FIG. 3 are designated by the same reference numerals. Here, X indicates the plate making portion, and Y indicates the printing portion. In FIG. 3 and FIG. 4, when the original 31 is inserted from the insertion opening 12 to a predetermined position and the plate making start switch 17 is pushed, first, the plate cylinder 32 is rotated once in the direction of arrow A in the drawing and wound on the plate cylinder 32. The previously attached plate-making paper is ejected to the plate ejection unit 27. After this,
One end of a plate-making paper 33 as a heat-sensitive stencil master wound in a roll is automatically attached to a sandwiching portion 34 provided on the plate cylinder 32. Next, after the plate cylinder 32 is rotated by a predetermined angle, the tension value applied to the plate 33 is measured by the tension detector 48. Whether or not the measured value is a tension value within a predetermined range is determined by a control unit described later. If the measured tension value is not within the predetermined range, the motor 61 of the tension adjusting unit 49 is driven,
By rotating the eccentric cam 60, the roll-shaped plate 33
Is adjusted so that the tension applied to the plate-making sheet 33 wound around the plate cylinder 32 thereafter becomes a tension value within the above-mentioned predetermined range.

The operation after adjusting the tension is performed in the same manner as the conventional one. That is, the pressure motor 35 is driven and the lamp house 36
Is driven in the direction of the pressing plate 37 (the direction of arrow B in the drawing). With the lamp house 36 and the pressing plate 37 pressed against the original 31 and the plate 33, the lamp house 36
The lamp 38 therein is instantly turned on. Due to the heat of the lamp 38, the image of the original 31 in the portion covered with the lamp house 36 is plate-formed on the corresponding plate-making paper 33. After this,
After the lamp house 36 descends and reaches a predetermined position, the plate cylinder 32 is rotated in the direction of arrow A in the figure by an angle corresponding to the width 1 of the lamp house 36, and the plate-making paper 33 and the original 31 are rotated.
Will be moved with this. When the movement is completed, the lamp house 36 is raised again as described above, and after reaching the predetermined position, the lamp 38 is momentarily turned on and plate making is performed. Then, the lamp house 36 is lowered again, and thereafter, the plate cylinder 3
2 is rotated by a predetermined angle and plate making is performed. In this way, the plate cylinder 32 is divided into plates in accordance with the intermittent driving, and the plate-making paper 33 that has been plate-made is sequentially wound around the plate cylinder 32.

When the plate making process progresses halfway as described above, the plate-made portion is trial printed at the same time as the remaining plate making. That is, when the plate cylinder 32 is rotated by a predetermined angle during plate making, the paper feed roller 4
0 and 41 are driven, and one sheet of printing paper 42 is taken in by the paper feed rollers 40 and 41. The paper 42 is pressed against the plate cylinder 32 by the pressure roller 43, and printing is performed as the plate cylinder 32 rotates. At this time, ink is supplied to the inside of the plate cylinder 32 from an ink supply unit (not shown), and this ink is uniformly discharged to the outer peripheral surface of the plate cylinder 32 at a predetermined density. The printed sheet 42 is conveyed in the direction of arrow C in the figure by a conveying section 47 including pulleys 44, 45, a belt 46 and the like.

The plate cylinder 32 is, for example, intermittently driven nine times to make one rotation, and the plate making is finished at the eighth time. Then, the plate cylinder 32 is stopped at the ninth time, and the plate-making paper 33 is cut by the cutter 39.
Further, the original 31 for which the plate making is completed is discharged from the take-out port 14. After that, the plate cylinder 32 is further rotated once, and the test printing of the remaining portion is performed. The test-printed paper 42 is ejected to the paper ejection tray 29 by the conveyance unit 47. The printing position and the plate making state are confirmed according to this test printing, and when the printing start switch 18 is pressed, the number of sheets set by the ten key 20 is printed.

In the above description, the plate making and the printing are performed discontinuously. However, by setting the original 31 and pressing the switch 24, the plate making and the printing can be performed continuously.

When the confidential switch 23 is pressed after printing is completed, the plate cylinder 3
2 is rotated to eject the printed plate-making sheet, and then the plate-making sheet 33 is sandwiched by the sandwiching portion 34, and the plate cylinder 32
Is rotated once, and the plate-making paper 33 remains the plate cylinder 32
Wrapped around. When the winding is completed, the plate-making sheet 33 is cut by the cutter 39 and the operation is stopped. By using this function, it is possible to prevent unnecessary printing using a plate-making sheet having confidentiality.

The plate-making paper is automatically dried by the feed roller (not shown) to the sandwiching portion 34 of the plate cylinder 32.

Next, the control unit will be described. In FIG. 6, a CPU (computer control unit) 62 as a main control unit is composed of, for example, a microcomputer, and stores a program indicating a procedure for controlling the above-described device ROM 6
3 and tension data corresponding to the tension value required when the plate-making paper 33 is wound around the outer peripheral surface of the plate cylinder 32 that does not cause wrinkles obtained by the above-described experiment, and a predetermined value based on the tension data. The RAM 64 for storing the drive data of the motor 61 for rotating the above-mentioned eccentric cam to obtain the tension value is stored. This RAM64
Is backed up by a battery 65 or a pack-up power source such as a capacitor, and the stored contents are protected.

The CPU 62 includes the display operation unit 15, the off-line control unit 66, the plate cylinder drive unit 68, and the paper feed roller drive motor 7.
0, a pressure roller driving plunger 71, and a conveyance unit driving motor 72 are connected. The offline control unit 66
The pressure motor 35, the lamp house 36, and the lamp 3 are
8 is provided with an exposure unit 67, and the plate cylinder drive unit 68 is provided with, for example, a DC motor 69 that rotates the plate cylinder 32. Further, of these, the offline control unit 66, the plate cylinder drive unit 68, the exposure unit 67, and the motor 69 constitute the plate making unit X, and the plate cylinder drive unit 68, the motors 70, 72, 69, and the plunger 71 form the printing unit Y. I am configuring.

The off-line control unit 66 that constitutes the plate making unit X controls the exposure unit 67 independently of the CPU 62. That is, when a drive signal for the pressure motor 35 is received from the CPU 62 during plate making, the offline control unit 66 independently generates the pressure motor 35.
The lamp 38 is driven for a moment while the lamp house 36 reaches a predetermined position.
A series of control operations of lowering 6 is performed. Then, when the lamp house 36 is lowered and reaches a predetermined position, a lamp house lowering end signal is output to the CPU 62. On the other hand, the printing unit Y is controlled online by the CPU 62, and as described above,
The plate cylinder 32 is continuously rotated, and the paper feed roller 40,
The motors 70, 72, 69 and the plunger 71 are controlled so that the pressure roller 41, the pressure roller 43, and the transport unit 47 perform predetermined operations.

The plate cylinder drive unit 68 performs an intermittent drive process of the motor 69 during plate making, and a continuous drive process of the motor 69 during printing.

Next, in the control section configured as described above, the tension adjusting section 49 for adjusting the tension on the plate-making sheet 33 is controlled as follows.

As described above, in the plate making operation, when one end of the plate-making paper 33 as the heat-sensitive stencil sheet that is wound in a roll is automatically attached to the sandwiching portion 34 provided on the plate cylinder 32,
The CPU 62 outputs a signal to the plate cylinder driving unit 68 to drive the motor 69 and rotate the plate cylinder 32 by a predetermined amount. In response to the command, the plate cylinder drive unit 68 excites the motor 69 to rotate the plate cylinder 32 by a predetermined amount (step S1 in FIG. 7). Next, the CPU 62 causes the tension detector 4 to
The tension value data currently applied to the plate-making base paper 33 detected by No. 8 is received and compared with the tension value data within a predetermined range stored in the RAM 64 (step S3). If the tension value data detected by the detector 48 is within the predetermined range of the tension value data stored in the RAM 64, the plate making process described above is performed. In addition, the tension detector 48
If the tension value data detected in step (4) is out of the predetermined range of the tension value data stored in the RAM 64, the motor 61 is driven in order to give the proper tension to the plate making base paper 33, and the eccentric cam 60 is moved. It is rotated to change the contact pressure of the spring piece portion 58 to the hemispherical projection 54 of the roll-shaped plate-making base paper 33 to adjust the rotation resistance of the roll-shaped plate-making plate 33 (step S4). The data for driving the motor 61 in this case is RA as described above.
It is stored in M64. After that, the plate making process described above is performed.

(Effects of the Invention) According to the stencil plate making / printing apparatus of the present invention, the tension of the stencil sheet between the sandwiching part and the plate making part is detected when the stencil sheet is wound around the outer peripheral surface of the printing drum, and the detected tension value is By adjusting the load applied to the stencil sheet outside the predetermined range, the tension value of the stencil sheet when wound around the outer peripheral surface of the printing drum is configured to be within the predetermined range, so that the stencil sheet is always wrinkle-free. The base paper can be wrapped around the outer peripheral surface of the printing drum, and it is possible to prevent the distortion and loss of characters during printing. Further, since the tension adjusting means does not function on the stencil sheet even when the tension value of the stencil sheet becomes zero except when it is wound around the printing drum, an excessive load is not applied to the stencil sheet,
Even if the tension adjusting means applies a load by linearly touching the stencil sheet, it does not damage the stencil sheet.This also prevents the characters from being distorted or missing at the time of printing and improves the printing quality. Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for measuring a tension value in a proper range given to a stencil sheet, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is an overview of a plate-making printing apparatus according to the present invention. FIG. 4 is a perspective view, FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, taken in the direction of the arrow, FIG. 5 is a schematic perspective view of the tension adjusting portion, and FIG. FIG. 7 and FIG. 7 are flowcharts for explaining the operation for adjusting the tension. 32 ... plate cylinder, 33 ... plate-making paper, 39 ... cutter,
48 ... tension detecting part, 49 ... tension adjusting part, 54 ... hemispherical protrusion, 58, 59 ... spring piece part, 6
0 ... Eccentric cam, 61 ... Motor, X ... Plate making part, Y ...
… Printing department.

Claims (2)

[Claims] 1. A sandwiching portion for locking one end of a roll-shaped stencil sheet to an outer peripheral surface of a printing drum, a plate-making section for making a plate of the stencil sheet, and a plate-making section for rotating the printing drum by a predetermined angle. In a stencil-type stencil-making apparatus provided with a printing unit for stencil printing by wrapping one plate of the stencil stencil sheet on the outer peripheral surface of the printing drum, the sandwiching is performed while the printing drum is rotating for a predetermined angle. Detecting means for detecting the tension of the stencil sheet between the printing section and the plate making section, and determining whether the tension value detected by the detecting means is within a predetermined value range and generating a determination signal And a tension adjusting means for adjusting the load of the stencil sheet when winding it on the outer peripheral surface of the printing drum so that the tension value is within a predetermined value range when the discrimination signal is out of the predetermined value range. Stencil type Edition printing device. 2. A stencil-type plate making and printing apparatus according to claim 1, wherein the tension value within the predetermined range is 0.18 to 1.78 g / mm.