JPH07137412A - Thermal stencil plate making device - Google Patents

Abstract

PURPOSE:To prevent a cut face from having a saw-tooth form by a method wherein a slit is formed on each side edge of a master by a cutter means after completion of forming a perforation image, and a perforation line or melting line including the slits for cutting the master is provided by controlling heating resistors. CONSTITUTION:In a thermal stencil plate making device, a thermal head 2 having heating resistors 8 arranged in a main scanning direction S is brought into contact with a master 1 made of a thermoplastic resin film, and a perforation image 9 is formed by heating the heating resistors 8 with the travel of the master 1 in a sub-scanning direction F. After the perforation image is completely formed on the master 1, the master 1 is cut. At this time, a slit 20 is provided on each side edge of the master 1 by a cutter means 11. In addition, a perforation line 19 or melting line for cutting the master 1 is formed between the both side slits 20, 20 formed by the cutter means 11 by controlling the heating resistors 8 so as to extend from one edge of the master 1 to the other edge thereof. In this manner, a cut face is prevented from being of a saw-tooth form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive stencil plate-making apparatus for forming a perforated image in a dot matrix manner by using a thermal head on a master for heat-sensitive stencil which is essentially composed of a thermoplastic resin film. is there.

[0002]

2. Description of the Related Art Digital thermal stencil printing apparatuses have been well known. FIG. 1 shows a plate making apparatus in this apparatus.
1 and (a), (b) and (c) of FIG.

This plate making apparatus has a master 71 for heat-sensitive stencil.
The resistance heating elements 721 arranged in a line in the main scanning direction S
The thermal head 72 having the heat generating element is brought into contact with the master 71 in the sub-scanning direction F orthogonal to the arrangement direction of the resistance heating elements 721.
Is moved relative to the thermal head 72 by the platen roller 73, and the perforation image 91 is formed in a dot matrix manner by the selective heating of the resistance heating element 721. The master 71 on which the perforation image 91 is formed is conveyed to the conveying roller pair 76. The master 71 is cut by the rotary blade 741 of the cutter means 74, and the printing paper is continuously pressed against the master 71 by a pressing means such as a press roller. Printing is performed by allowing ink to seep out from the perforated portion 71.

The above-mentioned master is made by mixing a very thin thermoplastic resin film such as polyester (hereinafter referred to simply as "film") and synthetic fibers or Japanese paper as a porous flexible support, or a mixture of Japanese paper and synthetic fibers. It has a laminated structure in which the above are laminated together, and an overcoat layer is provided on the surface of the film for fusing with the surface of the thermal head and for preventing electrification.

As the cutter means, Japanese Patent Laid-Open No. 63-62 is used.
As disclosed in Japanese Patent No. 773, a method has been proposed in which a movable blade is rotated along a belt-shaped fixed blade and reciprocally moved in the width direction of the master to cut the master.

[0006]

Since the master uses Japanese paper or the like as its support, the passage of the ink is obstructed at the part where the fibers of the Japanese paper are entangled with each other, and the ink does not transfer to the printing paper. There is a problem of so-called fiber stitches in which a fiber pattern appears on the part or fine lines are faint.

Therefore, it is possible to prevent the generation of fiber grain by printing with a master consisting of only a film without using Japanese paper or the like as a support, but the thickness of the film itself is , At most about 2-8μ
Since the thickness is about m, which is very thin, about 1/20 of the thickness of the Washi laminated master, which is about 40 to 50 μm, when the master is cut by the above-mentioned cutter means,
When the master is conveyed, the tip of the master is caught or stuck to the stepped portion of the moving path of the movable blade, and jams frequently occur. Also, by cutting the master while rotating the movable blade, the cutting surface of the master becomes a saw-tooth shape, so that the clamping means of the plate cylinder cannot apply a uniform constant tension to the master, causing creases and folds. It becomes impossible to wind around the plate cylinder without causing

Therefore, the present invention solves the above-mentioned problems, and when the master is conveyed, the tip of the master is not caught by the stepped portion of the moving path of the movable blade, so that no jam occurs and the cut surface of the master is An object of the present invention is to provide a novel heat-sensitive stencil plate-making device which does not have a saw-like shape.

[0009]

The invention according to claim 1 is
A thermal head having a plurality of resistance heating elements arranged in a line in the main scanning direction is brought into contact with a master for heat-sensitive stencil, and the master is set relative to the thermal head in a sub-scanning direction orthogonal to the arrangement direction of the resistance heating elements. Move it
In a heat-sensitive stencil plate making apparatus for forming a perforated image in a dot matrix system by selective heating of the resistance heating element,
A cutter in which the master consists essentially of a thermoplastic resin film, and a cut is made in both side edges of the master, leaving a length not exceeding the length in the main scanning direction of the thermal head in the central portion of the master. After the formation of the punched image on the master is completed, the cutter means cuts into both side edges of the master, and the cutting cuts the master from one side edge to the other side edge. It is characterized in that a control means for controlling the resistance heating element is provided so as to provide an array of holes or a fusing line.

According to a second aspect of the present invention, a thermal head having a plurality of resistance heating elements arranged in a line in the main scanning direction is brought into contact with a master for heat-sensitive stencil, and the sub-scanning is orthogonal to the direction of arrangement of the resistance heating elements. In a heat-sensitive stencil plate making apparatus for forming a perforated image in a dot matrix system by selectively heating the resistance heating element in a direction relative to the thermal head, the master is substantially a thermoplastic resin. It consists of a film only, and in the central part of the master, both side edges of the master formed with a length not exceeding the length in the main scanning direction of the perforated image of the maximum image size formed by the resistance heating element. A notch and a detection part provided at the cutting position, detecting means for detecting the detection part and detecting the cutting position; After the formation of the perforated image is completed, the cutting position is detected by the detecting means, and at this cutting position, the hole line for cutting or the fusing line for cutting of the master extending from one side edge of the master to the other side edge by the cut. And a control means for controlling the resistance heating element.

According to a third aspect of the present invention, in the heat-sensitive stencil plate making apparatus according to the first or second aspect, when the master is provided with a hole row or a cutting wire for cutting, the applied pulse width applied to the resistance heating element is The pulse width is equal to or larger than the applied pulse width applied to the resistance heating element during the formation of the perforated image.

According to a fourth aspect of the present invention, in the heat-sensitive stencil plate making apparatus according to the first or second aspect, the incisions include incisions in the main scanning direction and the sub-scanning direction, and the dimension range of the length of the incisions is: The length of the cut in the main scanning direction is y (mm), and the length of the cut in the sub scanning direction is x.
(Mm), it is characterized by being in a range satisfying 0.08 ≦ x / y ≦ 0.9.

According to a fifth aspect of the present invention, in the heat-sensitive stencil plate making apparatus according to the first or second aspect, when a hole row for cutting is provided in the master by the resistance heating element, a space between the holes of the hole row. d is the density of the resistance heating element r (do
t / mm) and the number of pixels in the interval is n (dot), the range is 0 ≦ d = n / r ≦ 0.25.

Here, the sub-scanning direction means the direction in which the heat-sensitive stencil master is conveyed, and the main scanning direction means the direction orthogonal to the sub-scanning direction. Further, the master for heat-sensitive stencil consisting essentially of a thermoplastic resin film, in addition to those in which the master consists of only the thermoplastic resin film, those containing a minor component such as an antistatic agent in the thermoplastic resin film Further, it includes one in which one or more thin film layers such as an overcoat layer are formed on both main surfaces of the thermoplastic resin film, that is, at least one of the front surface and the back surface.

[0015]

According to the invention described in claim 1, after the formation of the punched image is completed, the master makes the notches on both side edges by the cutter means, and the control means controls the resistance heating element to make the notches. Thus, a row of holes or a fusing line for cutting the master extending from one side edge to the other side edge of the master is provided.

According to the invention of claim 2, the master is
A notch on both side edges of the master formed with a length not exceeding the length in the main scanning direction of the punched image of the maximum image size formed by the resistance heating element in the central part, and the notch position provided at this notch position The detection unit detects the cut position. At this cut position, the control means controls the resistance heating element so that a hole row or a fusing line for cutting the master extending from one side edge to the other side edge of the master is provided by the cut.

According to the invention of claim 3, the master is
A row of holes for cutting or a fusing line can be provided with an energizing energy equal to or larger than the energizing energy applied to the resistance heating element at the time of forming a punched image.

According to the invention of claim 4, the master is
When the cut length in the main scanning direction is y (mm) and the cut length in the sub scanning direction is x (mm), 0.08 ≦
It is possible to make a notch in a dimension range whose length satisfies x / y ≦ 0.9.

According to the invention of claim 5, the master is
The distance d between the holes determines the density of the resistance heating elements by r (dot / m
m) and the number of pixels in the interval is n (dot), 0 ≦
A hole array for cutting is provided in a range that satisfies d = n / r ≦ 0.25.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 100 indicates a heat-sensitive stencil plate making apparatus in a stencil printing apparatus. Heat-sensitive stencil plate making apparatus 100
Is a shaft 1s serving as a holding unit that holds the master 1, a platen roller 3 that conveys the master 1 in the sub-scanning direction F,
A thermal head 2 that extends in parallel with the platen roller 3 and is provided so as to be able to come into contact with and separate from the platen roller 3.
And a cutter means 11 which is arranged in the conveyance path of the master 1 between the thermal head 2 and the shaft 1s, and which cuts into both side edges 1a of the master 1, and a master on the outer peripheral surface of the plate cylinder 7 while holding the master 1. It is mainly composed of a pressing roller pair 4 that conveys the master 1 toward the locking means 6. Note that reference numeral 5 in FIG. 1 denotes a guide plate for guiding the master 1 toward the master locking means 6 on the outer peripheral surface of the plate cylinder 7.

The master 1 is made of only a thermoplastic resin film having a width of 320 mm and a thickness of substantially 3.5 μm, is made of polyester or the like, is wound in a roll shape, and is supported by the shaft 1s so that it can be drawn out.

As shown in FIGS. 2A, 2B and 2C, the platen roller 3 extends in the main scanning direction S and its surface is made of conductive silicone rubber or the like, and is driven by a stepping motor (not shown). It is driven to rotate.

As shown in FIG. 3A, the thermal head 2 includes a plurality of resistance heating elements 8 arranged in one line in the main scanning direction S, and a holder 1 for holding and cooling the resistance heating elements 8.
It is mainly composed of 0 and 0. The thermal head 2 is
The platen roller 3 is provided so as to be movable in and out of contact with it by means not shown. The thermal head 2 is a well-known device that selectively melts and perforates the master 1 based on a digital image signal that is processed and transmitted by an A / D conversion unit and a control unit 18 of a document reading unit (not shown) to form a perforated image. Have a function. In this embodiment, the thermal head 2
Has a resistance heating element 8 of 16 DPM (dot / mm), and these resistance heating elements 8 are 293 m in the main scanning direction S.
4,608 pieces are arranged in a row at a constant pitch over the length of m (A3), and are divided into first to fourth blocks for control by the control means 18 described later.

As shown in FIG. 4, the cutter means 11 is connected to a movable blade 16 for making a cut in the side edge 1a of the master 1, an arm 15 for supporting the movable blade 16 at one end thereof, and the other end of the arm 15. The coil spring 14 and the solenoid 17 which is connected to the arm 15 by the pin 13 to selectively swing the arm 15 against the biasing force of the coil spring 14, and the side edge 1a of the master 1 when the movable blade 16 swings. Mainly from the base 18 that abuts through. As the movable blade 16, a T-shaped blade is used. As shown in FIG. 5A, the shape of the incision 17 on the both side edges 1a of the master 1 by the movable blade 16 is T-shaped, and the length of the thermal head 2 in the main scanning direction S is long at the center of the master 1. In order to make the cuts 20 on both side edges 1a of the master 1 with a length not exceeding the length, in this embodiment, the cut length y1 in the main scanning direction S is 18.5 m.
m, and the cut length x1 in the sub-scanning direction F is set to 5 mm. Notch 1 by cutter means 11
7 may be a solid line or a dotted line.

The control means 18 includes a, b and c in FIGS.
, The resistance heating element 8 of the thermal head 2 is selectively heated to contact the master 1 to form a perforated image 9, and the master 1 is conveyed in the sub-scanning direction F by the platen roller 3 for a predetermined length. After that, the notch 20 is made in the both side edges 1a of the master 1 by the cutter means 11, and the energizing energy applied to the resistance heating element 8 is controlled to make the notch 20.
With the master 1 extending from one side edge to the other side edge of the master 1
A row of holes 19 for cutting is formed. In this embodiment, the hole array 1
Although only 9 is shown, a fused line obtained by the resistance heating element, that is, an intermittent line that also includes a fused line, or a line that does not completely cut the master 1 may be used.

To form the perforated image 9, the main scanning direction S
It is necessary that the holes adjacent to each other in the sub-scanning direction F are independent without being connected, but when the hole row 19 for cutting of the master 1 is formed, the holes adjacent to each other in the main scanning direction S are formed. Since it is more convenient to connect with each other, the applied pulse width as one of the energizing energy in the case of forming the hole array 19 for cutting is set to be larger than that in the case of forming the perforation image 9.

The applied pulse width for forming the perforated image 9 is, as shown in FIG. 6, time t1 425 μs to 560 μs Input energy (applied power × time t1) 40 μJ to 52 μJ Applied power 93 mW In the case of forming the hole array 19 of, the time t2 is set to 610 μs to 640 μs, the input energy is 57 μJ to 60 μJ, and the applied power is 93 mW. As described above, since the resistance heating element 8 is divided into four blocks, the control of the energization time and the like is also divided into four.

Although the applied pulse width as one of energizing energy is changed here, the applied power (applied voltage) may be changed.

In this way, the applied pulse width is controlled by the control means 18, all resistance heating elements 8 are energized, and as shown in FIG. A row of holes 19 for cutting the master 1 over the edge is formed. In addition, as shown in FIG.
Thus, the non-perforated portion 1b may be formed by energizing each resistance heating element and the length d of the non-perforated portion 1b may be set to 0 to 250 μm. Next, this heat-sensitive stencil plate making apparatus 10
The operation of 0 will be described below. The master 1 stands by at a position slightly downstream of the pressing roller pair 4 with its tip end aligned in a direction substantially parallel to the pressing roller pair 4. By pressing a plate-making start key (not shown), a plate-making command is sent to a stepping motor (not shown) and the platen roller 3 starts rotating. When the platen roller 3 rotates, the pressing roller pair 4 also starts rotating.
A thermal head 2 that presses the master 1 in pressure contact with the platen roller 3 by a digital image signal that is processed and sent by an A / D converter and control means 18 (not shown).
The resistance heating element 8 is selectively heated, and the master 1 is selectively melted and perforated to form a perforated image 9. Master 1
After the formation of the perforated image 9 on the
(See FIG. 4) is excited, the arm 15 swings in the arrow X direction in FIG. 4 against the biasing force of the coil spring 14, and the master 1
Between the movable blade 16 and the base 18, a notch 20 can be formed on both side edges 1a thereof. Simultaneously with the end of this operation, the solenoid 17 is demagnetized and the urging force of the coil spring 14 causes the arm 1 to move.
5 and the movable blade 16 return to the position shown in FIG.

By further rotation of the platen roller 3 and the pressing roller pair 4, the master 1 is held between the pressing roller pair 4 as shown in FIG. 1 and FIG.
When the tip of the master 1 reaches the master locking means 6, the master locking means 6 locks the tip of the master 1. Simultaneously with this locking operation, the plate cylinder 7 rotates and the master 1 starts to be wound around the outer peripheral surface of the plate cylinder 7. When the master 1 is conveyed for a predetermined length and the both ends of the resistance heating element 8 and the notches 20 face each other, the control means 15 controls the resistance heating element 8 to cause the resistance heating element 8 to generate heat, and the resistance heating. The master 1 corresponding to the length 293 mm of the element 8 is melted and b of FIG.
As shown in FIG. 3, the notch 20 forms a hole array 19 for cutting the master 1 from one side edge to the other side edge of the master 1.

Next, when the master 1 is further conveyed by the rotation of the pressing roller pair 4 and the hole array 19 reaches a position slightly downstream of the pressing roller pair 4, the pressing roller pair 4 is held while the master 1 is held. Stops rotating. On the other hand, the plate cylinder 1
The master 1 on its outer peripheral surface is further rotated so as not to cause wrinkles, floats, or slacks on the outer peripheral surface thereof, and a tension of about 800 g is applied to the master 1 on the outer peripheral surface of the plate cylinder 7, so that the master 1 is shown as c in FIG. It is cut off at the hole row 19 as a boundary. Master 1 is plate cylinder 7
After being wound around the outer peripheral surface of, the printing process is started.

Another embodiment is shown in FIG. 3b and FIGS. 8 to 10. In the master 21 applied to the heat-sensitive stencil plate making apparatus 110 shown in this embodiment, as shown in a of FIG. 9, the main punching image of the maximum image size formed by the resistance heating element 8 is formed in the central portion of the master 21. A substantially T-shaped notch 27 is formed in advance on both side edges 21a of the master 21 with a length not exceeding the length in the scanning direction S, and a detected portion 26 is formed at the position of one notch 27. In this embodiment, the cut length y2 in the main scanning direction S is set to 10 mm, and the cut length x2 in the sub scanning direction F is set to 5 mm. The detected portion 26 is formed by painting with a black marker or the like, for example.

As shown in FIG. 8 and FIG. 3B, the heat-sensitive stencil plate making apparatus 110 is different from the above embodiment in that the cutter means 1 is used.
1 is removed, and the detected portion 26 of the master 21 faces the one side edge of the transport path of the master 21 on the downstream side of the platen roller 3.
Is provided and the resistance heating elements 24 for forming a part of the hole array 28 are arranged adjacent to both ends of the resistance heating element 8 in the thermal head 23. Only the configuration in which the length in the main scanning direction S is 302 mm is different.

The resistance heating element 8 and the resistance heating element 24 are
For the control by the control means 22, a total of 1st to 6th
Is divided into blocks.

The control means 22 includes a, b and c in FIGS.
As shown in FIG. 7, the resistance heating element 8 of the thermal head 23 is selectively heated to bring it into contact with the master 21 to form a punched image 9
Of the master 2 detected by the detecting means 25 after forming the
At the position of the notch 27 of the detected portion 26 at a predetermined length of 1, the applied pulse width as one of energizing energy applied to the resistance heating element 8 and the resistance heating element 24 is controlled, and the notch 27 serves as a master. A hole row 28 for cutting the master 21 is formed from one side edge of the master 21 to the other side edge thereof. Here, the predetermined length of the master 21 means the length of one plate wound around the plate cylinder 7. Similar to the above-described embodiment, only the hole array 27 is shown in this embodiment, but a fused line obtained by the resistance heating element, that is, an intermittent line including a fusion line, or the master 1 is completely removed. It may be a line that is not cut into.

The applied pulse width in the case of forming the perforated image 9 is, as shown in FIG. 10A, time t1 425 μs to 560 μs input energy (applied power × time t1) 40 μJ to 52 μJ applied power 93 mW. Operates from the second block to the fifth
It is a block.

On the other hand, when forming the hole row 28 for cutting of the master 21, as shown in FIG. 10B, the time t2 is 610 μs to 640 μs, the input energy is 57 μJ to 60 μJ, and the applied power is 93 mW. All blocks from the 1st block to the 6th block operate.

In this way, the applied pulse width is controlled by the control means 22, and all the resistance heating elements 8 and the resistance heating elements 2 are controlled.
4 is energized, and as shown in FIG. 9B, the master 2 extends from one side edge to the other side edge of the master 21 by the notch 27.
A hole array 28 for cutting 1 is formed. Further, as in the above-mentioned embodiment, as shown in FIG. 7B, the control means 22 energizes each resistance heating element to form the non-perforated portion 1b, and the length d of the non-perforated portion 1b is 0. The thickness may be set to ˜250 μm. Also, here, the applied pulse width as one of the energizing energy is changed, but the applied power (applied voltage) may be changed.

Regarding the operation of this embodiment, only the points different from the above embodiment will be described. Similar to the above-described embodiment, as shown in FIG. 9A, after the punched image 9 is formed, the master 21 is further rotated by the further rotation of the platen roller 3 and the pressing roller pair 4. As shown in FIG. 2, the master 21 is delivered to the master locking means 6 along the guide plate 5 while being held between the pressing roller pair 4.
When the leading end of the master locking means 6 reaches the master locking means 6, the master locking means 6 locks the leading end of the master 21. Simultaneously with this locking operation, the plate cylinder 7 rotates, and the master 21 starts to be wound around the outer peripheral surface of the plate cylinder 7. The detected part 26 in the predetermined length of the master 21 is detected by the detection means 25, and this detection signal is input to the control means 22.
Transports the master 21 for a predetermined length based on the detection signal. When the both ends of the resistance heating element 24 and the notch 27 face each other, the control means 22 controls the resistance heating element 8 and the resistance heating element 24 to cause the resistance heating elements 8 and 24 to generate heat, and the resistance heating element 8 and The master 21 corresponding to the length 302 mm with the resistance heating element 24 is melted, and as shown in FIG. 9B, the notch 27 is used to cut the master 21 from one side edge to the other side edge. Hole row 28
To form.

Next, when the master 21 is further conveyed by the rotation of the pressing roller pair 4 and the hole array 28 reaches a position slightly downstream of the pressing roller pair 4, the pressing roller pair 4 is held while the master 21 is held. Stops rotating. On the other hand, plate cylinder 7
Rotates further and applies a tension of about 800 g to the master 21 on the outer peripheral surface of the plate cylinder 7 so that the outer peripheral surface of the master 21 does not wrinkle, float, or slack. As shown in the figure, it is cut across the hole array 28. After the master 21 is wound around the outer peripheral surface of the plate cylinder 7, the printing process is started.

In the above-mentioned two embodiments, the notch has a T-shape, but it may have an L-shape as shown in FIGS. 5B and 5C. Further, as shown in d, e, and f of FIG. 5, a Y-shaped or a V-shaped cut shape may be used.

The length of the cut in the main scanning direction is y (m
m), the length of the cut in the sub-scanning direction was set to x (mm), and an experiment for obtaining the size range of the length of the cut was performed.
The results are shown in Table 1 below.

[0043]

[Table 1]

From the results of the experiment, when x / y is smaller than 0.08, it becomes difficult to control the formation of the hole array for cutting between the notches on the both side edges of the master in the sub-scanning direction. The cutting part does not become an approximate straight line because the cutting cannot be done or the master is torn off. Also,
When x / y is larger than 1.2, it becomes easy to form a hole row for cutting between the notches on both side edges of the master in the sub-scanning direction, but when the master is locked by the master locking means, Distortion is likely to occur at the cut portion, tension cannot be evenly applied to the master, and wrinkles and floating occur on the master. Therefore, the dimension range of the cut length is 0.08
It is set so as to satisfy ≦ x / y ≦ 0.9.

If the density of the resistance heating elements is r (dot / m)
m), when the number of pixels in the interval of each hole of the hole array when the hole array is provided is n (dot), each hole of the hole array when the hole array for cutting is provided in the master by the resistance heating element. An experiment was carried out to obtain the interval d. The results are shown in Table 2 below.

[0046]

[Table 2]

From the result of the experiment, the distance d between the holes is 0.25.
If it is larger than mm, the proportion of the unperforated part becomes large, and the master cannot be cut off by the plate cylinder, or the master is torn off, and the cut portion does not become an approximate straight line. When d is 0.25 mm or less, the tension portion of the master is unevenness of about 0.03 mm to 0.15 mm, and this unevenness can be regarded as a substantially approximate straight line, and the master is transferred to the plate cylinder. It was able to be wound without wrinkles or floating.
Therefore, the interval d is set in a range that satisfies 0 ≦ d = n / r ≦ 0.25. The range of the distance d is satisfied not only in the case of the master having a thickness of 3.5 μm shown in the above two embodiments, but also in the range of the thickness of the master of 1 to 10 μm.

[0048]

As described above, according to the first aspect of the invention, the cutter means does not exceed the length of the thermal head in the main scanning direction in the central portion of the master after the formation of the punched image is completed. A cut is made on both side edges of the master with the length left, and the control means controls the resistance heating element, and the cut provides a row of holes or a fusing line for cutting the master from one side edge to the other side edge of the master. Therefore, the cut surface of the master does not have a sawtooth shape, and wrinkles and floating do not occur on the master when the master is jammed and when the master is wound around the plate cylinder.

According to the second aspect of the invention, the master is formed with the length not exceeding the length in the main scanning direction of the punched image of the maximum image size formed by the resistance heating element in the central portion thereof. The master has a notch on both side edges of the master and a detected part provided at the notched position, and after the formation of the punched image on the master is completed, the detection means detects the detected part and detects the notched position. However, at this cutting position, the control means controls the resistance heating element, and the cutting provides a row of holes or a fusing line for cutting the master from one side edge to the other side edge of the master. The position alignment of the master is facilitated, and the hole row or the fusing line for cutting the master can be surely provided. Further, the cut surface of the master does not have a saw-tooth shape, so that a jam during the transportation of the master and a wrinkle or floating of the master when the master is wound around the plate cylinder do not occur.

According to the third aspect of the invention, the energizing energy applied to the resistance heating element when the master is provided with the hole array for cutting or the fusing line is equal to the energization energy applied to the resistance heating element during the formation of the perforation image. Or, since it is made larger, the cut surface of the master does not have a saw-tooth shape, and a wrinkle or a lift does not occur in the master during conveyance of the master or winding of the master around the plate cylinder.

According to the fourth aspect of the present invention, the incisions are incisions in the main scanning direction and the sub-scanning direction, and the dimension range of the incision length is y (mm) in the main scanning direction. , The length of the cut in the sub-scanning direction is x (mm)
In this case, since 0.08 ≦ x / y ≦ 0.9 is set to be satisfied, it becomes easy to form a hole row for cutting or a fusing line between the cuts on both side edges of the master in the sub-scanning direction.
The master can surely be stretched approximately linearly with the plate cylinder, and when the master is locked to the master locking means, distortion does not occur at the cut portion of the master and tension can be evenly applied to the master. Wrinkles and floats will not occur.

According to the fifth aspect of the present invention, when the resistance heating element is used to provide a hole array for cutting in the master, the distance d between the holes of the hole array is defined as r (dot).
/ Mm), and the number of pixels in the interval is n (dot),
Since the range is set to satisfy 0 ≦ d = n / r ≦ 0.25, the stretched portion of the master becomes a substantially approximate straight line, and the master can be wound around the plate cylinder without wrinkling or floating.

[Brief description of drawings]

FIG. 1 is a front view of a heat-sensitive stencil plate making apparatus showing an embodiment of the present invention.

2A is a plan view showing a master in which a notch is formed by a cutter means of the heat-sensitive stencil plate making apparatus shown in FIG.
1B is a plan view showing a master in which a hole array is formed by the heat-sensitive stencil plate making apparatus shown in FIG. 1, and FIG. 2C is a plan view showing a master stretched across the hole array shown in FIG. 2B. is there.

3A is a plan view showing a resistance heating element of the thermal head shown in FIG. 1, and FIG. 3B is a plan view showing a resistance heating element of another embodiment.

FIG. 4 is a schematic side view of the cutter means shown in FIG.

5A is a plan view showing a main part of a master in which a cut is formed by the cutter means shown in FIG. 4, and FIG. 5B is a plan view showing a main part of a master in which another cut is formed;
(C) is a plan view showing a main part of the master in which another cut is further formed, (d) is a plan view showing a main part of the master in which another cut is further formed, (e) is Further, FIG. 6F is a plan view showing an essential part of the master on which another notch is formed, and FIG. 6F is a plan view showing an essential part of the master on which another notch is formed.

FIG. 6 is a time chart showing an applied pulse width when forming a punched image and a hole array by the heat-sensitive stencil plate making apparatus shown in FIG.

FIG. 7 is an enlarged plan view of a main part showing an example of the hole row and notches shown in FIG. 2B, and FIG. 7B is an enlarged plan view of the main part showing another example of the hole row.

FIG. 8 is a front view of a heat-sensitive stencil plate making apparatus showing another embodiment of the present invention.

9A is a plan view of the heat-sensitive stencil plate making apparatus shown in FIG. 8, and FIG. 9B is a plan view showing a master in which a hole array is formed by the heat-sensitive stencil plate making apparatus shown in FIG. 9A. c) is shown in FIG.
FIG. 7B is a plan view showing the master stretched across the row of holes shown in FIG.

10A is a time chart showing an applied pulse width when a perforated image is formed by the heat-sensitive stencil plate making apparatus shown in FIG. 8, and FIG. It is a time chart which shows the applied pulse width in a case.

FIG. 11 is a front view of a conventional heat-sensitive stencil plate making apparatus.

12A is a plan view of the heat-sensitive stencil plate making apparatus shown in FIG. 11, and FIG. 12B is a plan view of a master in which a cutting portion is formed by cutter means in the heat-sensitive stencil plate making apparatus shown in FIG. , (C) are plan views showing the master cut along the cutting section shown in (b) of FIG.

[Description of symbols] 1,21 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ Thermal head 3 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ Guide plate 6 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ ‥‥‥ Cutter means 13 ‥‥‥‥‥‥ Pin 14 ‥‥‥‥‥‥ Coil spring 15 ‥‥‥‥‥‥ Arm 16 ‥‥‥‥‥ Movable blade 17 ‥‥‥‥‥‥ Solenoid 18, 22 ‥ ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ Detecting means 26 ‥‥‥‥‥‥‥ ‥‥‥‥ Main scanning direction F ‥‥‥‥‥‥ Sub-scanning direction 100,110 ‥‥‥‥

Claims (5)

[Claims] 1. A thermal head having a plurality of resistance heating elements arranged in a line in the main scanning direction is brought into contact with a master for heat-sensitive stencil, and the master is set in the sub-scanning direction orthogonal to the arrangement direction of the resistance heating elements. In a heat-sensitive stencil plate making apparatus that forms a perforated image in a dot matrix manner by selectively heating the resistance heating element by moving relative to a thermal head, the master substantially consists of a thermoplastic resin film, and In the center of the master, there is cutter means for making a notch on both side edges of the master, leaving a length that does not exceed the length of the thermal head in the main scanning direction, and formation of a punched image on the master is completed. After that, the cutter means makes a notch on both side edges of the master, and with this notch, the master extending from one side edge to the other side edge of the master is cut. Providing the control means for controlling the resistive heating element to provide a row of holes or blown lines for cross stencil making apparatus according to claim. 2. A thermal head having a plurality of resistance heating elements arranged in a line in the main scanning direction is brought into contact with a master for heat-sensitive stencil, and the master is set in the sub-scanning direction orthogonal to the arrangement direction of the resistance heating elements. In a heat-sensitive stencil plate making apparatus that forms a perforated image in a dot matrix manner by selectively heating the resistance heating element by moving relative to a thermal head, the master substantially consists of a thermoplastic resin film, and A notch on both side edges of the master formed in the central portion of the master with a length not exceeding the length in the main scanning direction of the perforated image of the maximum image size formed by the resistance heating element, and this notch position And a detection unit that detects the detection unit and detects the cut position, and the formation of the punched image on the master is completed. After that, the cutting position is detected by the detecting means, and at this cutting position, the resistance is provided so as to provide a hole row or a cutting line for cutting the master extending from one side edge of the master to the other side edge by the cutting. A heat-sensitive stencil plate making apparatus comprising a control means for controlling a heating element. 3. The heat-sensitive stencil plate making apparatus according to claim 1, wherein the energizing energy applied to the resistance heating element when the master is provided with a hole array for cutting or a fusing line is the above-mentioned when the perforated image is formed. A heat-sensitive stencil plate making apparatus characterized by being equal to or larger than the energizing energy applied to the resistance heating element. 4. The heat-sensitive stencil plate making apparatus according to claim 1 or 2, wherein the incision comprises an incision in the main scanning direction and a sub-scanning direction, and a dimension range of the length of the incision is that of the incision in the main scanning direction. When the length is y (mm) and the length of the cut in the sub-scanning direction is x (mm), the range is 0.08 ≦ x / y ≦ 0.9. apparatus. 5. The heat-sensitive stencil plate making apparatus according to claim 1 or 2, wherein when the master heater is provided with a hole array for cutting by the resistance heater element, the distance d between the holes of the hole array is the resistance heat generation. The element density is r (dot / mm), and the number of pixels in the interval is n
(Dot), a heat-sensitive stencil plate making apparatus characterized by being in a range satisfying 0 ≦ d = n / r ≦ 0.25.