JPS61197275A - Stencil making type printing machine - Google Patents

Abstract

PURPOSE:To wind a stencil paper without causing wrinkling, by a method wherein when winding a stencil paper around the outer peripheral surface of a print drum, the tension on the stencil paper is detected, and is controlled to within a predetermined range. CONSTITUTION:An end of a rolled form stencil paper 33 is fitted to a clamping part 34 on a form cylinder 32. After rotating the cylinder 32 a predetermined angle, the tension on the stencil paper 33 is detected by a tension-detecting part 48. A controlling part discriminates whether or not the detected tension is in the predetermined range. When the detected tension is out of the range, a motor 61 in a tension-adjusting part 49 is driven to rotate an eccentric cam 60, thereby control the rotation resistance of the roll of the stencil paper 33. As a result, the tension on the stencil paper 33 to be wound around the cylinder 32 is adjusted to within the predetermined range. Accordingly, the stencil paper can be wound without being wrinkled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stencil-type stencil printing device, and more particularly, a stencil-type stencil printing device that controls the tension value within a predetermined range when winding a roll of stencil paper around a printing drum. Related to plate making and printing equipment.

(Prior Art) Conventionally, a stencil printing apparatus has been known which includes a stencil making means for making a stencil paper, and a printing means for performing stencil printing using the stencil paper made by the stencil making means. For example, patent application Sho G7-ZO72 filed by the same applicant as the present applicant.
x6 (Japanese Unexamined Patent Publication No. 46983)
The stencil printing device shown in No. 19261 (Japanese Unexamined Patent Publication No. 59-143679) uses a roll of stencil paper, and one end of the roll of stencil paper is attached to the outer peripheral surface of a printing drum. After being locked by a clamp device, the plate is made by a plate making means, and the printing drum is rotated to wrap around the drum surface and printing is performed.

If the stencil paper after plate making is not carefully wrapped around the outer peripheral surface of the printing drum, the stencil paper will be wrapped with wrinkles, resulting in problems such as missing characters and distortions as a result of printing.

An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art, and to prevent the occurrence of wrinkles when wrapping stencil paper around the outer circumferential surface of a printing drum after plate making, and the resulting defects during printing. The object of the present invention is to provide a stencil-type stencil printing device that can perform the following steps.

(Means for Solving the Problems) The present invention has been made in view of the above points, and detects the tension value given to the stencil paper when wrapping the stencil paper around the outer peripheral surface of the printing drum. When the detected value is outside a predetermined range, the tension applied to the stencil paper is adjusted to bring it within the predetermined range, thereby achieving wrapping of the stencil paper around the outer peripheral surface of the printing drum without causing wrinkles. This is what I did. That is, the present invention provides a stencil-type stencil printing apparatus in which one end of a roll-shaped stencil paper is locked to a printing drum surface and is wound around the outer peripheral surface of the printing drum to perform printing, in which the stencil paper is attached to the outer peripheral surface of the printing drum. a detection means for detecting the tension applied to the stencil paper when it is wound around the stencil; a means for determining whether the tension value detected by the detection means is within a predetermined range; and a determination by the determination means. and control means for adjusting the tension applied to the stencil paper when it is wound around the outer peripheral surface of the drum to a tension value within the predetermined range when the tension value is outside the predetermined range. shall be.

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

FIGS. 1 and 2 show the experimental equipment necessary to measure the tension value required to wrap the stencil paper around the printing drum of the stencil-type stencil printing apparatus without wrinkles on the outer peripheral surface according to the present invention. It is a figure showing an outline. This experimental device consists of a modified base paper supply section (printing drum and base paper insertion stand) of the stencil printing machine "RISOGRAPH 007" manufactured by Riso Kagaku Kogyo Co., Ltd. A roller 5 whose central axis was supported by a ball bearing 3 was attached to the leading edge of the table 1. After configuring as described above, a roll of stencil paper 81 "Lingraph 007 Master" is cut to a certain length, one end of the stencil paper is attached to the clamping device 9 of the printing drum, and the other end is lowered through the roller 5. At the same time, a rigid plate member 85 with the same width as the base paper and a uniform thickness is attached to the end thereof, and a weight 87 is suspended with a thread from the center position of the rigid plate 85, so that the width of the base paper is so that the weight was applied evenly (see Figure 2). Note that there is no member between the roller 5 and the clamping device 9 of the printing drum 7 that provides resistance to the base paper 81, and the roller 5 that comes into contact with the base paper is supported by the pole bearing 3 as described above. The rotational 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 wrap the base paper (master) around the print drum surface, and after printing 10 sheets, it was directly observed whether wrinkles were generated on the base paper on the drum surface. In each experiment, the rotational speed of the printing drum when winding the stencil paper was the same. Further, the weight of the weight, which will be described later, is the sum of the weight of the weight suspended from the string and the weight of the rigid plate member. Base paper 81 "RISOGRAPH 007 MASTER" is a thermoplastic synthetic resin film (
Heat-sensitive stencil paper (width 270w x length 125m) made by laminating a porous support (thin paper made of Manila hemp) with an adhesive (vinyl acetate adhesive) (polyester film)
) is rolled into a roll. Table 1 shows the results of measuring the tension of the base paper and the occurrence of wrinkles by varying the weight of the weight.

Margin below Table 1 Based on the experiments described above, the tension required to wrap the stencil paper around the outer peripheral surface of the printing drum without wrinkles is 0.18 g.
/m or more and 1.78 g/m or less.

The present invention maintains the tension of the stencil paper wound around the printing drum during printing within a predetermined range to prevent wrinkles as described above. Explain.

FIG. 3 is a diagram showing an example of a plate-making printing apparatus to which the present invention is applicable, and FIG. 4 is a sectional view taken along the line rV-rV in FIG. 3 in the direction of the arrows. First, in FIG. 3, the device main body 11
At one end of the upper part is an insertion slot 1 into which the original for plate-making printing is inserted.
2 is provided, and this insertion opening 12 is provided with a document table 13 for guiding the document. A take-out port 14 through which the inserted document is output is provided at the center of the top surface of the apparatus main body 11, and a display/operation section 15 is further provided at the top-side portion. This display operation section 15 includes a power switch 1.
6, plate-making start switch 17, print start switch 18, print stop switch 19, numeric keypad 20 for setting the number of prints
, a switch 21 for setting the printing speed, a switch 22 for adjusting the printing position with respect to the paper, a switch 23 for specifying confidential printing, a switch 24 for specifying continuous operation of plate making and printing, a cover 25 for these switches 23 and 24, and a cover 25 for these switches 23 and 24. Display section 2 that displays the number of sheets set using the numeric keypad 20
It consists of 6.

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

Further, at the other end of the lower part of the apparatus main body 11, a paper feed table 28 is provided on which printing paper is placed, and at one end of the lower part of the apparatus main body 11, a paper discharge table 29 is provided from which the printed paper is ejected. It is being

Next, in FIG. 4, a tension detection section 48 is provided between the plate cylinder 32 and the cutter 39 to detect the tension applied to the plate-making paper 33 when it is wound around the outer peripheral surface of the plate cylinder 32. This tension detection section 48 has a function of converting the amount of movement of a contactor of a commonly sold tension gauge electrically (for example, into voltage) and sending it to a computer control section CPU, which will be described later. Furthermore, in the storage section that rotatably and replaceably accommodates the roll-shaped plate-making paper 33, the resistance when drawing out the roll-shaped plate-making paper 33 is calculated based on the tension value detected by the tension detection section 48. A tension adjustment section 49 is provided to adjust 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 section in which this tension adjustment section 49 is provided 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 surfaces of 3.
1 is integrally provided, and the paper 33 to be plated is wound around the core between the pair of side plates 50 and 51. Moreover, hemispherical protrusions 54 are integrally provided on the tip surfaces of each of the protruding shafts 52,53 on the outside of the side plates 51,52. Roll-shaped plate-making paper 33 configured as described above
The pair of protruding shaft portions 52 and 53 support the three support rollers 55.
．． The receiver is rotatably stopped by 56.57,
Furthermore, spring pieces 58 and 59 are provided on the side surfaces of each hemispherical projection 54 to make contact with the hemispherical projection 54 in order to restrict movement to both sides. And this spring piece 5
8.59 has a motor 6 for rotationally driving the eccentric cam 60 and the eccentric cam 60 that are in close contact with the side surface thereof.
1 is provided and constitutes the tension fIl adjustment section 49. In other words, the tension adjustment section 49 rotates the eccentric cam 60 via the gear by the motor 61 to vary the contact pressure of the spring piece 58 to the hemispherical protrusion 54, thereby adjusting the rotational resistance of the roll-shaped plate-forming paper 33. By adjusting the
This is to adjust the tension when wrapping the plate-making paper 33 around the plate cylinder 32.

Next, the operation of the stencil type printing press-I apparatus having the above-described configuration will be explained. In FIG. 4, the same parts as in FIG. 3 are given the same reference numerals. Here, 63 indicates a plate making section, and 64 indicates a printing section. 3 and 4, when the original 31 is inserted into the insertion slot 12 to a predetermined position and the plate-making start switch 17 is pressed, the plate cylinder 32 is rotated once in the direction of the arrow shown in the figure, and the plate cylinder 32 is wound. The previously applied plate-making paper is discharged from the plate discharge unit 27.

Thereafter, one end of the plate-making paper 33, which is wound into a roll and serves as a thermal stencil original, is automatically attached to a clamping portion 34 provided on the plate cylinder 32. Next, after rotating the plate cylinder 32 of a predetermined angle, the tension detection unit 48 trowel and the paper 3 to be plated are rotated.
The tension value given in 3 is measured. A control unit, which will be described later, determines whether or not the measured value is a tension value within a predetermined range. If the tension value is not within the predetermined range, the motor 61 of the tension adjustment unit 49 is driven, and the eccentric cam 60 is rotated to adjust the rotational resistance of the roll-shaped plate-making paper 33, and the tension on the plate-making paper 33 that is subsequently wound around the plate cylinder 32 is adjusted to a tension value within the above-mentioned predetermined range. Ru.

Operations after tension adjustment are performed in the same manner as before. That is, the pressurizing motor 35 is driven, and the lamp house 36
is driven in the direction of the presser plate 37 (in the direction of arrow B in the figure). With the lamp house 36 and the presser plate 37 pressing the original 31 and the paper 33 to be plated, the lamp house 36
The lamp 38 inside is lit momentarily. By the heat of the lamp 38, the image of the portion of the original 31 covered by the lamp house 36 is made into a corresponding plate 33. After this,
After the lamp house 36 is lowered 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 l of the lamp house 36, and the plate paper 33 and original document 31 are rotated by an angle corresponding to the width l of the lamp house 36.
will be moved along with this. When the movement is completed, the lamp house 36 is raised again in the same manner as described above, and after reaching a predetermined position, the lamp 38 is momentarily turned on and plate making is performed. Then, the lamp house 36 is lowered again, and after this, the plate cylinder 3
2 is rotated by a predetermined angle, and plate making is performed. As shown in □, plate making is performed in parts as the plate cylinder 32 is driven intermittently, and the plate-formed paper 33 is sequentially wound around the plate cylinder 32.

As described above, when the plate making progresses halfway, the portion that has already been made is trial printed at the same time as the rest of the plate making. That is, when the plate cylinder 32 is rotated by a predetermined angle during plate making, the paper feed roller 40
．． 41 is driven, and one sheet of printing paper 42 is taken in by this paper feed roller 40.41. This paper 42 is pressed against the plate cylinder 32 by a pressure roller 43, and printing is performed as the plate cylinder 32 rotates. At this time, ink is supplied into the plate cylinder 32 from an ink supply section (not shown), and this ink is uniformly discharged onto the outer peripheral surface of the plate cylinder 32 at a predetermined concentration.

This printed paper 42 is connected to pulleys 44, 45 and belt 4.
It is transported in the direction of arrow C in the figure by a transport section 47 consisting of 6 or the like.

Incidentally, the plate cylinder 32 is driven intermittently, for example, nine times to make one rotation, and the plate making is completed at the eighth time. Then, at the ninth time, the plate cylinder 32 is stopped and the paper 33 to be plated is cut by the cutter 39.

Further, the original 31 for which plate making has been completed is discharged from the take-out port 14. Thereafter, the plate cylinder 32 is rotated one more rotation, and the remaining portion is trial printed. This test-printed paper 42 is discharged onto the paper discharge table 29 by the conveying section 47. When the printing position and plate-making state are confirmed in accordance with this test printing and the print start switch 18 is pressed, printing for the number of sheets set with the numeric keypad 20 is performed.

In the above description, plate making and printing were performed discontinuously, but if the original 31 is set and the switch 24 is pressed, plate making and printing can be performed continuously.

In addition, when the security switch 23 is pressed after printing is completed, the plate cylinder 3
2 is rotated and the printed plate paper is ejected, and after that, the plate paper 33 is clamped by the clamping part 34, and the plate cylinder 32
is rotated once, and the paper 33 to be plated remains unprinted and is transferred to the plate cylinder 32.
wrapped around. When the winding is completed, the cutter 39 cuts the paper 33 and the operation is stopped. By using this function, unnecessary printing using confidential plate-making paper can be prevented.

Incidentally, the paper to be plate-made is automatically fed to the clamping portion 34 of the plate cylinder 32 by a feed roller (not shown).

Next, the control section will be explained. In FIG. 6, a CPU (computer control unit) 62 as a main control unit is composed of, for example, a microcomputer, and a ROM that stores a program indicating an operating procedure for controlling the above-mentioned device.
63, tension data for the tension value required when winding the plate-making paper 33 around the outer circumferential surface of the plate cylinder 32 that does not cause wrinkles, obtained through the above-mentioned experiment, and a predetermined tension based on the tension data. A RAM 64 is built in to store drive data for the motor 61 that rotates the eccentric cam described above in order to obtain values. This RAM64
is backed up by a backup power source such as a battery 65 or a capacitor, and the stored contents are protected.

The CPU 62 includes the display operation section 15, an offline control section 66, a plate cylinder drive section 68, and a paper feed roller drive motor 7.
0, pressure roller driving plunger 71, [feed section driving motor 72 is connected.

The off-line control section 66 is provided with an exposure section 60 consisting of the pressure motor 35, lamp house 36, and lamp 38, and the plate cylinder drive section 68 is provided with, for example, a DC motor 69 for rotating the plate cylinder 32. . Further, among these, the offline control section 66, plate cylinder drive section 68, exposure section 67, and motor 69 constitute the plate making section X, and the plate cylinder drive section 68, motors 70, 72, 69, and plunger 71 constitute the printing section Y. It consists of

An offline control section 66 constituting the plate making section X controls the exposure section 67 independently from the CP Ll 62. That is, when a drive signal for the pressure motor 35 is received from the CPU 62 during plate making, the off-line control unit 66 independently drives the pressure motor 35 and instantaneously turns on the lamp 38 when the lamp house 36 reaches a predetermined position. , After that, a series of control operations are performed in which the lamp house 36 is lowered. 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, printing department Y is CPU
As mentioned above, the plate cylinder 32 is continuously rotated, and the motors 70. 72.69, plunger 71
is now under control.

The plate cylinder drive unit 68 intermittently drives the motor 69 during plate making.
The motor 69 is continuously driven during printing.

Next, in the control section configured as described above, a tension adjustment section 49 adjusts the tension to the plate-making paper 33.
The control is performed as follows.

As described above, when one end of the plate-making paper 33 as a thermal stencil base paper wound into a roll during the plate-making operation is automatically attached to the clamping part 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 and causes the plate cylinder 32 to move by a predetermined amount (step Sl in FIG. 7). Next, the CPU 62 controls the tension detection section 48
The current tension value data applied to the plate-making base paper 33 detected by is received and compared with tension value data within a predetermined range stored in the RAM 64 (step S3). If the tension value data detected by the detection unit 48 is within the predetermined range of the tension value data stored in the RAM 64, the plate-making process described above is performed. Further, if the tension value data detected by the tension detection unit 48 is outside the predetermined range of the tension value data stored in the RAM 64,
In order to apply appropriate tension to the plate-making base paper 33, the motor 61 is driven, the eccentric cam 60 is rotated, and the contact pressure of the spring piece 58 to the hemispherical protrusion 54 of the roll-shaped plate-forming base paper 33 is varied. Then, the rotational resistance of the roll-shaped plate-making paper 33 is adjusted (step S4). The data for driving the motor 61 in this case is stored in the RAM 64 as described above.
It is stored within. Thereafter, the plate-making process described above is performed.

(Effects of the Invention) According to the stencil printing apparatus of the present invention, the tension applied to the stencil paper when it is wound around the outer peripheral surface of the printing drum is detected, and the detected tension value is a tension value within a predetermined range. Since the tension applied to the stencil paper is adjusted to an appropriate tension value within the predetermined range when the stencil paper is outside, the stencil paper can always be wound around the outer peripheral surface of the printing drum without wrinkles. , it is possible to prevent character distortions, omissions, etc. during printing.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an apparatus for measuring the appropriate range of tension values to be applied to stencil paper, Fig. 2 is a partially enlarged view thereof, and Fig. 3 is an overview of the stencil printing apparatus according to the present invention. FIG. 4 is a cross-sectional view taken along the line ■-IV in FIG. 7 are flowcharts illustrating operations for tension adjustment. 32... Plate cylinder, 33... Paper to be plated, 39... Cutter, 48... Tension detection section, 49... Tension adjustment section, 54... Hemispherical protrusion, 58.59...・
Spring piece, 60... Eccentric cam, 61... Motor, X
... Plate making department, Y... Printing department. Agent Patent Attorney Takeshi Kawakita Nagai C) Ward 3 Figure 4 Figure 4

Claims (2)

[Claims] (1) In a stencil-type stencil printing device in which one end of a roll-shaped stencil paper is locked to a printing drum surface and is wrapped around the outer peripheral surface of the printing drum to perform printing, the stencil paper is wrapped around the outer peripheral surface of the printing drum. a detecting means for detecting the tension applied to the stencil paper when the stencil sheet is moved; a means for determining whether the tension value detected by the detecting means is within a predetermined range; A control means for adjusting the tension applied to the stencil paper when it is wound around the outer peripheral surface of the drum to a tension value within the predetermined range when the tension value is outside the predetermined range. Plate-type plate-making printing equipment. (2) The stencil printing apparatus according to claim 1, wherein the tension value within the predetermined range is 0.18 to 1.78 g/mm.