JPH079752A - Screen printing machine and master thereof - Google Patents

Abstract

PURPOSE:To enhance the feed properties of a master and to prevent the generation of plate making wrinkles by providing a release means releasing a base film from the master to a master feed passage feeding the master wherein a thermal screen printing film and the base film are laminated to a plate cylinder. CONSTITUTION:A thermal screen printing film 22 and the base film 21 supporting the same are laminated in a releasable manner and wound in a roll form to obtain a master 20 which is, in turn, sent out by supply rollers 7c, 7d. This master 20 is wound around the outer peripheral surface of a porous cylindrical plate cylinder 1 in such a state that one end thereof is clamped by a clamper 2. At this time, a perforated image is formed on the master 20 corresponding to manuscript image data on the way of the feed of the master 20 by a plate making means 14 containing a thermal head 8 and printing is applied to the plate cylinder 100 through the master 20. In this screen printing machine, a release means 15 containing a wedge-shaped member 13 is arranged on the feed passage (p) between the plate making means 14 and a clamper 2 and the base film 21 is released from the master 20 after plate making.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine and a master for a stencil printing machine, in which a heat-sensitive stencil master perforated by a plate making means is wound around a plate cylinder to perform printing.

[0002]

2. Description of the Related Art A master for heat-sensitive stencil printing used in a stencil printing machine is a thermoplastic synthetic resin film such as a very thin polyester and a synthetic fiber, Japanese paper, or Japanese paper as a porous flexible support. It also has a laminated structure in which a synthetic fiber is mixed and firmly bonded.
The stencil printer is set to 1 in the main scanning direction with respect to this master.
The thermal heads equipped with the resistance heating elements arranged in rows are brought into contact with each other, and the master is moved relatively to the thermal head by the platen roller in the sub-scanning direction orthogonal to the arrangement direction of the resistance heating elements, thereby selectively selecting the resistance heating elements. A perforated image is formed in a dot matrix manner by heating, and the master on which the perforated image is formed is conveyed by a conveying roller, and the master tip is held by the clamping means provided on the outer peripheral surface of the plate cylinder. It is automatically wrapped around the outer peripheral surface of the master, the master is cut by the cutter, and the printing paper is continuously pressed on the master by the pressing means such as a press roller, and the ink is ooze out from the perforated part of the master to perform printing. There is.

[0003]

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.
In addition, at the start of printing, after the support has a certain amount of ink and the ink passes through the holes of the thermoplastic synthetic resin film, it may be difficult to print immediately after winding the master around the plate cylinder. The ink does not spread uniformly, a large amount of printing paper is required to make the ink uniform, and the printing paper is wasted. Further, even when the plate is discharged, the ink held by the support is also discarded together with the master, so that there is a problem that the ink consumption increases.

Therefore, it is possible to prevent the generation of fiber grain by printing with a master consisting of only a thermoplastic synthetic resin film without using Japanese paper or the like as a support, but the thermoplasticity The thickness of the synthetic resin film itself is about 1 to 8 μm, which is very thin compared to the thickness of the Washi laminate master of about 40 to 50 μm.
Further, since the thermoplastic synthetic resin film is a highly insulating material, it is easily charged with static electricity, and jams and the like frequently occur when the thermoplastic synthetic resin film is wound around the conveying roller or stuck to the guide member. Moreover, when only the thermoplastic synthetic resin film is subjected to plate making with a thermal head, wrinkles called plate making wrinkles occur due to the heat shrinkage of the thermoplastic synthetic resin film.

As described above, since the master made of only the thermoplastic synthetic resin film is difficult to use for printing, the thermoplastic synthetic resin film has an ink-permeable porous flexibility such as Japanese paper as described above. The support is laminated or the thermoplastic synthetic resin film is thickened to increase the strength of the thermoplastic synthetic resin film and improve the transportability. However, if the thickness of the thermoplastic synthetic resin film is increased, the durability of the thermal head is significantly reduced because it cannot be punched unless the temperature of the heating element such as the thermal head is raised, and the thickness of the thermoplastic synthetic resin film is increased. If there is too much, there will be a problem that it cannot be drilled and the cost will increase significantly.

Since the magnetic force is strengthened in the clamp means or a high friction member is provided on the master contact surface of the clamp means, the clamp means becomes large in size,
Since it becomes thicker and protrudes from the outer peripheral surface of the plate cylinder, the contact / separation distance of the press roller becomes long. Therefore, since the press roller can be operated at a high speed for a long distance, there is a problem in that noise is generated.

Therefore, the present invention solves the above-mentioned problems, provides a master which is inexpensive, has good transportability, and is free from plate-making wrinkles. An object of the present invention is to provide a novel stencil printing apparatus that can obtain a printed image.

[0008]

The invention according to claim 1 is
The heat-sensitive stencil film and the base film supporting the heat-sensitive stencil film are detachably attached and wound in a roll, and the master for heat-sensitive stencil is pulled out and conveyed toward the locking means of the heat-sensitive stencil film of the plate cylinder. However, in the stencil printing apparatus that writes a punched image according to the document image information by the plate making means during the transportation, and winds the image on the outer peripheral surface of the plate cylinder to perform printing, between the plate making means and the locking means. It has a peeling means which is provided in the conveyance path of the master and peels the base film from the master.

According to a second aspect of the present invention, in the configuration of the stencil printing apparatus according to the first aspect, the peeling means is on the transport path and is disposed at a bonding boundary portion between the heat-sensitive stencil film and the base film. The heat-sensitive stencil film is directed toward the locking means and the base film is peeled off in a direction different from that of the locking means, and the heat-sensitive stencil film is pressed against the lower surface of the wedge-shaped member and peeled off. To the locking means, and a feed roller for conveying the base film that is pressed against the upper surface of the wedge-shaped member and peeled off.

According to a third aspect of the present invention, the heat-sensitive stencil film and the base film supporting the heat-sensitive stencil film are releasably attached to each other and wound in a roll, and the heat-sensitive stencil master is pulled out while pulling out the master for the heat-sensitive stencil. While conveying the stencil film toward the locking means, a perforation image is written by the plate making means in accordance with the document image information while being conveyed, and only the heat-sensitive stencil film is wound around the outer peripheral surface of the plate cylinder for printing. In the stencil printing apparatus, the locking means is provided on a part of the outer peripheral surface of the plate cylinder, holds the heat-sensitive stencil film by an adhesive force or a suction force, and between the locking means and the heat-sensitive stencil film. Adhesive force or suction force acting is a holding member that is stronger than the adhesive force acting between the heat-sensitive stencil film and the base film, and the tip of the master in which the perforated image is written is A pressing means for pressing the serial holding member,
A heat-sensitive stencil held by the holding member by the pressing means, the discharging means being arranged near the downstream side of the pressing means in the conveying direction of the base film, and discharging the base film in a direction other than the holding member. The film is peeled from the base film by the plate cylinder and the discharging means.

According to a fourth aspect of the present invention, in a master of a stencil printing apparatus in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably attached, the master is the heat-sensitive stencil film and the base film. A stencil having a sticking part which is a region in which a punched image is stuck and in which a heat-sensitive stencil film and a base film are not stuck to the end part of the sticking part in the master transport direction. It is the master of the printing device.

According to a fifth aspect of the present invention, in the structure of the master of the stencil printing apparatus according to the fourth aspect, the base film is peeled from the heat-sensitive stencil film to a part of the base film in the unattached portion. It is a master of a stencil printing machine provided with an opening.

According to a sixth aspect of the present invention, in the configuration of the stencil printing apparatus according to the second aspect, a sticking portion which is an area in which a perforated image obtained by sticking the heat-sensitive stencil film and the base film is written, and the sticking portion. The base film is peeled from the heat-sensitive stencil film to an unattached part in which the heat-sensitive stencil film and the base film are not attached to each other in the master transport direction and a part of the base film in the above-not-attached part. And a pre-peeling means for starting the peeling of the base film from the heat-sensitive stencil film by pushing down the heat-sensitive stencil film from the above-mentioned opening of the master.

[0014]

According to the first aspect of the invention, the master in which the document image information is written has the base film peeled from the master by the peeling means arranged in the conveying path and is wound around the outer peripheral surface of the plate cylinder. .

According to the second aspect of the invention, the master in which the document image information is written is peeled between the heat-sensitive stencil film and the base film by the wedge-shaped member arranged on the conveying path, and the peeled heat-sensitive stencil film. Is conveyed by the conveying roller toward the locking means on the outer peripheral surface of the plate cylinder and wound around the outer peripheral surface of the plate cylinder.

According to the third aspect of the invention, the heat-sensitive stencil film held by the holding member by the pressing means and having the original image information written therein is peeled from the base film by the plate cylinder and the discharging means, and at the same time, the plate cylinder. Is wound around the outer peripheral surface of.

According to the invention of claim 4, the master is
The heat sensitive stencil film and the base film are not bonded to each other, and the heat sensitive stencil film and the base film are not bonded to the front end portion in the master transport direction of the heat sensitive stencil film and the base film. And a sticking part.

According to the fifth aspect of the invention, the base film is peeled from the heat-sensitive stencil film because the opening is formed in a part of the base film in the unattached portion.

According to the sixth aspect of the present invention, the master in which the image information of the original is written has the heat sensitive stencil film pushed down from the opening by the front peeling means to start peeling of the base film from the heat sensitive stencil film. It The peeled heat-sensitive stencil film is conveyed by the conveying roller toward the locking means on the outer peripheral surface of the plate cylinder and wound around the outer peripheral surface of the plate cylinder.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 100 indicates a master supply device in the heat-sensitive stencil printing apparatus. Master supply device 100
Is a pair of first plate feeding rollers 7c, 7d for feeding out a master 20 for heat-sensitive stencil printing in which a heat-sensitive stencil film 22 and a base film 21 supporting the heat-sensitive stencil film 22 are releasably pasted together and wound in a roll shape. And a clamper 2 provided on the outer peripheral surface of the porous cylinder plate cylinder 1 as a locking means for locking the tip of the heat-sensitive stencil film 22.
A plate making means 14 for writing image information on the master 20 by the platen roller 9 and a thermal head 8 provided so as to be able to come into contact with and separate from the platen roller 9, and a plate making means 14
And a clamper 2, which is disposed on the conveying path p between the clamper 2 and the master 20, for peeling the base film 21 from the master 20, a heater wire 12 provided in the peeling means 15 for cutting the heat-sensitive stencil film 22, and a plate making means 14. It is mainly composed of a pair of second plate feeding rollers 7a, 7b which are provided between the peeling means 15 and convey the master 20 to which the perforated image is written by the plate making means 14 toward the peeling means 15.

The master 20 has a thickness of 1 as shown in FIG.
A heat-sensitive stencil film 22 made of a thin thermoplastic synthetic resin film having a thickness of 10 μm and a base film 21 supporting the heat-sensitive stencil film are laminated in a roll shape so as to be peeled off by a force of 150 g to 800 g, and are fed to a shaft 5. Supported as possible. The base film 21 is
It is formed of a resin film or paper having a thickness of 30 to 60 μm. In order to facilitate the initial setting of the master 20, which will be described later, an unattached portion 42 in which the heat-sensitive stencil film 22 and the base film 21 are not adhered is formed at the leading end of the master 20.

The plate cylinder 1 has a two-layer structure of a porous cylindrical support layer forming an inner peripheral surface thereof and a mesh screen layer forming an outer peripheral surface thereof. (Only the support layer is shown in FIG. 1.) The plate cylinder 1 is rotatably supported around a rotation center axis that also serves as an ink pipe 55, and is rotationally driven in the direction of arrow X by a motor (not shown).

The clamper 2 extends in parallel with the axial direction of the outer peripheral surface of the plate cylinder 1 and is provided so as to be openable and closable, and has a well-known structure for picking up the master by magnetic action.

The platen roller 9 has its shaft 9s rotatably supported and is rotationally driven at a predetermined speed by a step motor (not shown).

The thermal head 8 extends in parallel with the platen roller 9 and is provided so as to come into contact with and separate from the platen roller 9 by a contacting / separating mechanism (not shown). The thermal head 8 has a well-known function of selectively melting and punching the master 20 based on a digital image signal processed and sent by an A / D conversion unit and a plate making control unit (both not shown) of a document reading unit (not shown). Have.

The peeling means 15 is arranged at the bonding boundary between the heat sensitive stencil film 22 and the base film 21 on the conveying path p, and the wedge-shaped member 13 for peeling the master 20 into the heat sensitive stencil film 22 and the base film 21. Wedge-shaped member 1
Heat-sensitive stencil film 22 that is pressed against the lower surface of 3 and peeled off
Is configured to include a transport roller 11 that transports the base film 21 toward the locking means 2, and a feed roller 10 that transports the base film 21 that is pressed against the upper surface of the wedge-shaped member 13 and peeled off. The transport roller 11 and the delivery roller 10 are set to rotate in the arrow directions at the same peripheral speed.

The heater wire 12 extends in the direction traversing the heat-sensitive stencil film 22 on the lower surface of the wedge-shaped member 13 slightly downstream of the nip portion n between the lower surface of the wedge-shaped member 13 and the conveying roller 11, and is composed of a nichrome wire. The surface is coated with a fluororesin film.

In the inside of the plate cylinder 1, an ink roller 56 for supplying ink to the inner peripheral surface of the plate cylinder 1 is arranged in parallel with the ink roller 56 with a slight gap therebetween.
Doctor roller 58 that forms an ink reservoir 57 between
And an ink pipe 5 that supplies ink to the ink reservoir 57
5 and 5 are arranged. Here, the ink roller 56, the doctor roller 58, and the ink pipe 55 form an ink supply device.

A sheet supply device 200 is arranged below the master supply device 100. The paper feeding device 200 is
A press roller 3 that swings vertically up and down near the outer peripheral surface of the plate cylinder 1 facing the ink roller 56 and presses the printing paper 59 against the printing cylinder 1, and a registration roller that sends the printing paper 59 to the press roller 3 at a predetermined timing. Pair 60 and paper feed table 61
Paper distribution roller 62 for distributing the paper 59 placed on the paper
And a separation roller 63 that is in pressure contact with the paper distribution roller 62 and separates the paper into one sheet.

On the left side of the plate cylinder 1 in FIG.
0 is set. The plate discharging unit 300 includes a plate discharging box 64 for accommodating a used heat-sensitive stencil film (not shown) stripped from the outer peripheral surface of the plate cylinder 1 and a used heat-sensitive stencil film (not shown) from the outer peripheral surface of the plate cylinder 1. It has plate discharge rollers 4a and 4b for peeling and transferring.

Next, the operation of this stencil printing machine will be described below. First, the master 20 supported by the shaft 5 so that it can be fed out is passed between the thermal head 8 and the platen roller 9 and pulled out to the wedge-shaped member 13, and as shown in FIG. Between the base film 21 of the unattached portion 42 of the master 20 described above.
Between the conveying roller 11 and the wedge-shaped member 13
The heat sensitive stencil film 22 of No. 2 is held between them, and the master 20 is initially set.

Next, by pressing a plate-making start key (not shown), a plate-making command is sent to a step motor (not shown), the platen roller 9 starts rotating, and both are processed by the A / D converter and the plate-making controller not shown. By the digital image signal thus sent out, the resistance heating element of the thermal head 8 sandwiching the master 20 and in pressure contact with the platen roller 9 is selectively heated, and the master 20 is selectively melted and perforated. Then, the master 20 perforated in this way is conveyed to the upstream side of the peeling means 15.

The plate making command is sent to the sending roller 10 and the carrying roller 11, and the sending roller 10 and the carrying roller 11 rotate. As the rollers 10 and 11 rotate, the base film 21 is separated from the master 20 with the tip portion 13a of the wedge-shaped member 13 as a boundary. After that, the base film 21 is discharged to a waste box (not shown) by discharge roller pairs 16a and 16b provided downstream of the feed roller 10. The heat-sensitive stencil film 22 further transported by the rotation of the transport roller 11 hangs downward due to its own weight and is delivered toward the spreader clamper 2.

Next, as shown in FIG. 4, the tip of the heat-sensitive stencil film 22 is locked by closing the clamper 2 at a predetermined timing, and simultaneously with this clamping operation, the plate cylinder 1 moves in the direction of arrow X. By rotating, the heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1.

A heat-sensitive stencil film 22 is wound on the outer peripheral surface of the plate cylinder 1 for a predetermined length, and the heater wire 12 is energized from a power supply source (not shown) to heat the heater wire 12. As shown in FIG. The stencil film 22 is fused. Immediately after the thermal stencil film 22 is melted, the platen roller 9 stops rotating. Thereafter, as shown in FIG. 6, the heat-cut stencil film 22 that has been blown is wound around the outer peripheral surface of the plate cylinder 1. As described above, since the heater wire 12 is arranged slightly downstream of the nip portion n between the lower surface of the wedge-shaped member 13 and the transport roller 11, after the heat sensitive stencil film 22 is melted by the heater wire 12. Also, heat sensitive stencil film 22
Is held by the conveyance roller 11. After the heat-sensitive stencil film 22 has been melted and cut, the transport roller 11 slightly rotates, and the leading edge of the next heat-sensitive stencil film 22 is sent to the initially set position.

After the heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1, the printing process is started. First, the paper feed table 6
The printing paper 59 placed on the No. 1 is paired with the registration roller pair 60 by the paper distribution roller 62 and the separation roller 63 one by one.
Is transported to. The registration roller pair 60 inserts the conveyed printing paper 59 into the contact portion between the plate cylinder 1 and the press roller 3 at a predetermined timing synchronized with the rotation of the plate cylinder 1. The press roller 3 separated from the outer peripheral surface of the plate cylinder 1 moves upward and rotates in the arrow X direction.
When the printing paper 59 is pressed against the heat-sensitive stencil film 22 wound around the outer peripheral surface of the ink, the ink is transferred to the openings 1 of the plate cylinder 1.
a, passing through the perforated portion of the heat-sensitive stencil film 22, transferred to the surface of the printing paper 59 and printed. At this time,
The ink roller 56 also rotates in the same direction as the rotation direction of the plate cylinder 1, and supplies ink to the inner peripheral surface of the plate cylinder 1. Then, the printed printing paper 59 is printed on the plate cylinder 1 by a peeling nail (not shown).
The so-called plate making is completed by peeling from the outer peripheral surface of the sheet and printing the first sheet. Next, by the same operation as the above operation, a predetermined number of prints are sequentially and continuously performed.

When the printing is finished and the image of the next original is printed, the used heat-sensitive stencil film (not shown) is wound before the new heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1. ) Is peeled from the outer peripheral surface of the plate cylinder 1. At this time, the plate cylinder 1 is rotated in the direction opposite to the arrow X direction, and stopped at the position where the plate discharge roller 4a is in pressure contact with the rear end of the heat-sensitive stencil film, and at the same time, the plate discharge rollers 4a and 4b are respectively rotated in the direction opposite to the arrow X direction. Starts to rotate in the direction, and the plate discharge roller 4a moves to the plate cylinder 1
The outer peripheral surface of the used heat-sensitive stencil film is pressed against the rear end of the film to start peeling. At this time, the plate cylinder 1 restarts rotation in the direction opposite to the arrow X direction. The used master separated from the outer peripheral surface of the plate cylinder 1 is discarded into the plate discharge box 64.
After that, the plate cylinder 1 stops at a predetermined position and enters a plate supply standby state.

In the above embodiment, the base film 21 peeled by the peeling means 15 is used as the discharge roller pair 16a, 1
6B, the base film cutter 18 cuts the base film 21 for each plate between the discharge roller pair 16a, 16b and the peeling means 15, as shown in FIG.
A waste box 64 for storing the cut base film 21 and a pair of guide rollers 16c and 16d for guiding the cut base film 21 into the waste box 64 are provided to cut the base film 21 plate by plate. You may make it discard it. According to this configuration, a larger amount of the base film 21 can be disposed in the disposal box of the same size as in the above-described embodiment. Reference numeral 17 is a jam cutter that cuts the master when the master 20 jams.

Further, as shown in FIG. 8, a pair of discharge rollers 1
A winding roller 19 for the base film 21 may be provided downstream of 6a and 16b to wind the base film 21. According to this configuration, the base film cutter 18 and the discard box 64 are not needed as compared with the example shown in FIG. 7, and the number of parts is reduced.

FIG. 9 shows an example of another master 120. The master 120 has a non-adhered portion 42 in which the heat-sensitive stencil film 22 and the base film 21 are not attached to one end side of the master 120, and the heat-sensitive stencil film 22 and the base film 21 in parallel with the transport direction of the master 120. It is formed by the sticking part 41 stuck together. Note that reference numeral 43
Indicates the boundary between the unattached portion 42 and the attached portion 41. Master 1
By forming 20 as shown in FIG.
When the master 20 is jammed and the master 120 is cut in the middle, the base film 21 can be easily peeled off from the master 120, and the initial setting and the like are simplified. In addition, the unattached portion 42 is set parallel to the conveyance direction of the master 120, and the master 1
It may be provided on both ends of 20.

FIG. 10 shows a modification of the embodiment shown in FIGS. 1 to 9. The peeling means 150 shown in this embodiment is different from the embodiment shown in FIGS.
peeling rollers 25 and 26 arranged downstream of a and 7b for peeling the base film 21 from the master 20, a sensor 67 provided downstream of the peeling rollers 25 and 26 for detecting the presence or absence of the master 20, and connected to the sensor 67. The control means 68 for controlling the rotation of the peeling roller 26, and the heat-sensitive stencil film 22 which is arranged below the second plate feeding rollers 7a and 7b and the peeling rollers 25 and 26 and from which the base film 21 is peeled off, are transferred to the clamper 2. Third plate feeding roller 65 to be conveyed toward
And a heater wire 66 which is disposed between the third plate feeding roller 65 and the clamper 2 and melts and cuts the heat-sensitive stencil film 22. The heater wire 66 extends in a direction traversing the heat-sensitive stencil film 22, and is supported by insulating holders 66a at both ends thereof.
The insulating holder 66a is swingably supported by swinging means (not shown). The heater wire 66 is made of, for example, a nichrome wire, and both ends thereof are connected to a power supply source (not shown).

The operation of the peeling means 150 is shown in FIG.
Only differences from the embodiment shown in FIG. 9 will be described. First, the master 20 is pulled out to a position slightly downstream of the platen roller 9, and its tip 20a is initially set in a state of being aligned substantially parallel to the platen roller 9. As shown in FIG. 11A, the leading end portion 20a of the master 20 in which the punched image is written is moved to a position slightly passing the peeling rollers 25 and 26 as in the above-described embodiment.
It is conveyed by plate feed rollers 7a and 7b. At this time, the sensor 67 detects the master 20 and outputs a detection signal to the control means 68.
To enter. Based on this signal, the control means 68 controls the driving means (not shown) of the peeling roller 26 to rotate the peeling roller 26 in the reverse direction. After that, as shown in FIG. 11B, the heat-sensitive stencil film 22 starts to be peeled from the base film 21. By further rotation of the peeling roller 26, the front end portion 22a of the heat-sensitive stencil film 22 is completely pushed out to the upstream side of the peeling roller 26, hangs downward due to its own weight, and is sandwiched by the third plate feeding roller 65. Be transported to.

The heat-sensitive stencil film 22 as in the above embodiment.
Is wound around the outer peripheral surface of the plate cylinder 1 for a predetermined length, and the heater wire 66 is energized by energizing the heater wire 66 from an unillustrated power supply source.
6 heats up. At the same time, a signal command based on this length is sent to the swinging means (not shown), and the insulating holder 66a
The heated heater wire 66 is swung from the position shown by the solid line in the figure to the position (shown by the chain double-dashed line in the figure) where it comes into contact with the heat-sensitive stencil film 22, and the heat-sensitive stencil film 22 is fused. After that, the heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1 and printed by the same operation as that of the above-described embodiment. According to this embodiment, the tip portion 20 of the master 20 is
Since it is not necessary to form the non-adhered portion 42 on a, the cost can be reduced. Also, the initial setting of the master 20 is simplified.

FIG. 12 shows another embodiment. The master supply device 110 shown in this embodiment is arranged in the conveyance path P of the master 20 upstream of the second plate supply rollers 7a and 7b as compared with the embodiment shown in FIGS.
A heater wire 36 for fusing, a heater roller 35 provided at a position opposed to the heater wire 36 for pressing the master 20 against the heater wire 36, and a heat-sensitive stencil film 22 provided along the generatrix of the outer peripheral surface of the plate cylinder 1 Locking means 6 composed of a thin plate-shaped holding member 31 for holding by force or suction force
9 and the tip portion 20 of the master 20 in which the punched image is written
pressing means 32 for selectively pressing a to the holding member 31,
Discharging means including discharge rollers 34a and 34b for transporting the base film 21 to a direction other than the holding member 31 and a take-up roller 19, which is arranged in the vicinity of the downstream side of the pressing means 32 in the transport direction of the base film 21, and the second feeding. Plate roller 7b
Which is the lower part of the plate cylinder 1 and near the outer peripheral surface of the plate cylinder 1
The only difference is the configuration including the cleaning roller 37 that can be brought into and out of contact with the first unit.

The holding member 31 is made of a soft urethane rubber, a synthetic rubber having a viscosity, or a sheet having a large number of micro suction cups formed thereon, and is adhered to the surface of the plate cylinder 1 with an adhesive so as to be replaceable. Holding member 31 and heat sensitive stencil film 2
The adhesive force or the adsorption force acting between the heat sensitive stencil film 22 and the base film 21 is set to be stronger than the sticking force acting between the heat sensitive stencil film 22 and the base film 21. Cleaning roller 37
Is supported by a mechanism (not shown) so that it can be brought into contact with and separated from the holding member 31, and is made of a water-retaining substance such as sponge. The pressing means 32 is configured to be able to selectively press the master 20 against the holding member 31 by a contacting / separating mechanism (not shown).

The operation of this embodiment will be described with reference to FIGS.
Only the points that differ from the embodiment shown in FIG.
First, pull out the master 20 to the winding roller 19,
The heat sensitive stencil film 22 is peeled off from the master 20, and the base film 21 is locked to the winding roller 19. Then, as shown in FIG. 12, cutting is performed so that the leading end 22a of the heat-sensitive stencil film 22 and the downstream end of the pressing means 32 are aligned, and the master 20 is initially set.

Similar to the operation of the embodiment shown in FIGS. 1 to 11, the front end portion 22a of the heat-sensitive stencil film 22 on which the perforated image is written has the plate cylinder 1 and the pressing member 32 as shown in FIG. Between the second plate feed rollers 7a and 7b, the discharge roller 3
It is conveyed by 4a and 34b. The contacting / separating mechanism (not shown) of the pressing member 32 operates at a predetermined timing, the pressing member 32 descends as shown in FIG. 13, and the master 20 is pressed against the holding member 31. At the same time, the plate cylinder 1 starts to rotate in the arrow Y direction, and the heat-sensitive stencil film 2 is formed on the surface of the holding member 31.
The second tip 22a is held.

The adhesive force or the adsorption force acting between the holding member 31 and the heat-sensitive stencil film 22 is the heat-sensitive stencil film 2.
2 is stronger than the sticking force acting between the base film 21 and the base film 21, the plate cylinder 1 and the discharge rollers 34a and 34b are further rotated while the pressing member 31 is pressed against the master 20. As shown in, the heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1 while being peeled off from the base film 21.

A heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1 for a predetermined length, and a heater wire 36 is energized by a power source (not shown) to heat the heater wire 36, so that only the heat-sensitive stencil film 22 is melted. It After that, when the melted heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1 and the leading end 22a of the next heat-sensitive stencil film 22 reaches the above-mentioned initially set position, the pressing means 32 releases the pressing. Then, the rotation of the plate cylinder 1, the discharge rollers 34a and 34b, and the winding roller 19 is stopped. After the heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1, printing is performed as described above.

At the time of discharging the plate, the cleaning roller 37 is brought into contact with the holding member 31 by a mechanism (not shown), and the dirt of the holding member 31 is removed by the rotation of the plate cylinder 1. The cleaning roller 37 may be composed of a brush.

Further, the discharging rollers 34a and 34b may be omitted, and the discharging means may be constituted by only the winding roller 19, and the winding roller 19 may be arranged in the vicinity of the downstream side of the pressing means 32.

FIG. 15 shows an example of still another master 121. The master 121 is an area where the punched image in which the heat-sensitive stencil film 22 and the base film 21 are bonded is written to the master 120 shown in FIG.
1 and a non-adhered portion 42 in which the heat-sensitive stencil film 22 and the base film 21 are not adhered to each other at the tip of the adhered portion 41 in the master transport direction. The length of the unattached portion 42 is set to 1 cm or more in order to peel the base film 21 from the master 121.
If the master 121 jams in the stencil printing machine,
Unattached portion 4 upstream of the jammed position of the master 121
The second master 121 may be cut with a cutter or the like in a direction slightly crossing the master 121 from the upstream side of the boundary 43 on the leading end side in the transport direction, and the master 121 may be initially set as described above. According to this master 121, the base film 21 can be easily peeled off from the master 121, and the initial setting and the like can be simplified. Further, a mark indicating the unattached portion 42 may be added to the base film 21. By adding the mark in this way, it becomes easy to detect the unattached portion 42.

Further, as shown in FIG. 16, the unattached portion 4
2, the hole row 44 for cutting the master 121a may be provided in the direction traversing the master 121a. According to this configuration, when the master 121a is jammed, the master 121a can be easily cut at the boundary of the hole row 44.

17 to 21 show still another embodiment. The master supply device 111 shown in this embodiment is similar to that shown in FIG.
14 to the embodiment shown in FIG. 14, in the conveyance direction of the sticking part 41, which is a region in which the perforated image obtained by sticking the heat-sensitive stencil film 22 and the base film 21 is written, and the master 122 of the sticking part 41. Heat sensitive stencil film 22 on the tip
An unattached portion 42 in which the base film 21 and the base film 21 are not attached, and an opening 45 for separating the base film 21 from the heat-sensitive stencil film 22 in a part of the base film 21 of the unattached portion 42. Master 122 (see FIG. 1)
8), the heat sensitive stencil film 22 is pushed downward from the opening 45 to start peeling of the base film 21 from the heat sensitive stencil film 22, and the heat sensitive stencil in which the base film 21 is peeled by the front peeling means 151. The only difference is the configuration having a guide plate 52 that guides the film 22 between the wedge-shaped member 13 and the transport roller 11.

The front peeling means 151 is the second plate feeding roller 7.
A compressor (not shown) having an air outlet 51 at a position between the a and 7b and the wedge-shaped member 13 near the upper side of the base film 21 and facing the opening 45 formed in the conveyed base film 21. Of the air supply device, and selectively blows air from the air outlet 51 through the opening 45 onto the heat-sensitive stencil film 22.

Regarding the operation of the pre-peeling means 151 of this embodiment, only the differences from the embodiment shown in FIGS. 1 to 14 will be described. First, as shown in FIG. 19, the master 122 is pulled out to a position slightly downstream of the second plate feeding rollers 7a and 7b, and its tip portion 122a is aligned substantially parallel to the second plate feeding rollers 7a and 7b. Initially set to. As shown in FIGS. 17 and 20, the master 122 in which the punched image is written is the same as in the above-described embodiment.
3, the air outlet 51 of the front peeling means 151 and the opening 45 of the base film 21 face each other. At the same time, the air 53 from the air outlet 51 of the front peeling means 151 connected to an air compressor (not shown) or the like.
Is sprayed onto the heat-sensitive stencil film 22 through the opening 45, and the base film 21 is peeled from the heat-sensitive stencil film 22. Further, by rotating the second plate feeding rollers 7a and 7b, as shown in FIG. 21, the base film 21 is provided between the delivery roller 10 and the wedge-shaped member 13, and the heat-sensitive stencil film 22 is provided between the conveying roller 11 and the wedge-shaped member 13. It is held between each. The other operations are similar to those of the embodiment shown in FIGS.

As shown in FIG. 22, a part of the opening 45 may be provided in the sticking portion 41, and further, as shown in FIG.
As shown in FIG. 3, a boundary 4 between the unattached portion 42 and the attached portion 41
3, a hole row 44 for cutting the master 122 may be provided in a direction traversing the master 122. According to this configuration, when the master 122 is jammed, the sticking portion 41 becomes stiff at the time of cutting, and it is easy to cut.

24 to 27, another front peeling means 15 is shown.
2 shows an example. The front peeling means 152 is inserted into the opening 45 of the base film 21 with respect to the front peeling means 151 shown in FIGS.
The release pin 54 for separating the base film 21 from the heat-sensitive stencil film 22, and a position where the release pin 54 is selectively separated from the base film 21 and a position in which the heat-sensitive stencil film 22 is pressed downward. The only difference is the configuration having a swing mechanism that does not.

The operation of the pre-peeling means 152 will be described. First, as shown in FIG. 25, the master 122 is pulled out to a position slightly downstream of the second plate feeding rollers 7a and 7b, and the tip portion 122a thereof is pulled out to the second plate feeding rollers 7a and 7b.
Initially set to be approximately parallel to. As in the above-described embodiment, the master 122 to which the punched image is written is shown in FIG.
As shown in FIG. 4 and FIG. 26, the peeling pin 54 of the front peeling means 152 and the opening 45 of the base film 21 face each other by being conveyed by a predetermined length toward the wedge-shaped member 13. At the same time, a swinging mechanism (not shown) is actuated, the peeling pin 54 is inserted into the opening 45 of the base film 21 from a position separated from the base film 21, and is swung to a position where the heat-sensitive stencil film 22 is pushed down. The base film 21 is peeled off from 22. Further, the second plate feeding roller 7
As shown in FIG. 27, the base film 21 is sandwiched between the feed roller 10 and the wedge-shaped member 13 and the heat-sensitive stencil film 22 is sandwiched between the transport roller 11 and the wedge-shaped member 13 by the rotation of a and 7b. . The other operations are similar to those of the embodiment shown in FIGS. It should be noted that the above-described configuration of the front peeling means 151 and the configuration of the front peeling means 152 are used together, and a swinging mechanism is provided at the air outlet 51 so that the air outlet 51 is provided with the opening 4 of the base film 21.
5 may be inserted.

[0060]

As described above, according to the invention of claim 1, the master having the heat-sensitive stencil film and the base film adhered thereto is conveyed and perforated, and the base film is transferred from the master on the upstream side of the plate cylinder. Since it is peeled off, the master can be easily transported, plate-making wrinkles do not occur, and a clear printed image with no waste of printing paper and ink and no generation of fiber grain can be obtained.

According to the second aspect of the present invention, except when the master is initially set and when the master is jammed again, the feed roller feeds the base film and the feed roller feeds the heat-sensitive stencil film. Meanwhile, since the base film is peeled off from the master at the tip of the wedge-shaped member, it is not necessary to peel off the tip of the master every time a punched image is written.

According to the third aspect of the invention, since the locking means is composed of a thin plate-shaped holding member, the height of the locking means is reduced, the moving distance of the press roller is shortened, and printing at high speed is performed. Is possible, and noise is reduced. Further, the base film can be easily peeled from the master.

According to the fourth aspect of the present invention, since the heat-sensitive stencil film and the base film are not bonded to each other at the tip of the bonding section in the master transport direction, the unbonded section is provided.
When initializing the master again by jamming the master etc., by cutting the master at the unbonded part, the base film can be peeled from the unbonded part of the cut master. Easy to set.

According to the invention described in claim 5, since the opening is provided in a part of the unattached portion of the base film, the heat sensitive stencil film is pushed through the opening to separate the base film from the heat sensitive stencil film. Will be easier.

According to the invention of claim 6, a master in which an opening is provided in a part of the unattached portion of the base film is used,
By providing the pre-peeling means for pushing down the heat-sensitive stencil film from the opening, the pre-peeling means starts the peeling of the base film from the heat-sensitive stencil film, and the peeling means ensures the peeling.

[Brief description of drawings]

FIG. 1 is a side view of a stencil printing machine showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a master of the stencil printing apparatus shown in FIG.

3 is a side view of an essential part showing an example of a peeling unit of the stencil printing apparatus shown in FIG. 1, showing a state in which a master is initially set.

FIG. 4 is a side view of the main part of the peeling means shown in FIG.
The state where the front end of the heat-sensitive stencil film is locked by the locking means is shown.

5 is a side view of a main part of the peeling means shown in FIG.
The state where the heat-sensitive stencil film is cut is shown.

6 is a side view of the main part of the peeling means shown in FIG.
1 shows a state in which a heat-sensitive stencil film is wound around a plate cylinder.

FIG. 7 is a side view of a stencil printing machine showing a modified example of the embodiment shown in FIGS.

8 is a side view of a stencil printing machine showing a modified example of the embodiment shown in FIGS. 1 to 7. FIG.

9 is a perspective view showing another example of the master of the stencil printing apparatus shown in FIG.

FIG. 10 is a side view showing a modified example of the peeling means.

11 (a) is a side view of the main part of the peeling means shown in FIG. 10, showing a state where the master is initially set,
FIG. 11B is a side view of the main part of the peeling means shown in FIG. 10, showing a state in which the heat-sensitive stencil film has begun to be peeled from the master.

FIG. 12 is a side view of a main part of a stencil printing machine showing another embodiment of the present invention.

13 is a side view of a main part of the stencil printing apparatus shown in FIG. 12, showing a state where the master is pressed by a pressing means and held by the plate cylinder.

FIG. 14 is a side view of the main part of the stencil printing apparatus shown in FIG. 12, showing a state in which the heat-sensitive stencil film is peeled off and wound around the plate cylinder.

FIG. 15 is a perspective view showing still another example of the master of the stencil printing apparatus.

FIG. 16 is a perspective view showing still another example of the master of the stencil printing apparatus.

FIG. 17 is a perspective view of a main part of a front peeling unit of a stencil printing apparatus showing still another embodiment of the present invention.

FIG. 18 is a plan view of a master of the stencil printing apparatus shown in FIG.

FIG. 19 is a side view of the main part of the front peeling means of the stencil printing machine shown in FIG. 17, showing a state where the master is initially set.

20 is a side view of the main part of the peeling means of the stencil printing apparatus shown in FIG. 17, showing a state where the heat-sensitive stencil film has begun to be peeled from the master by the front peeling means.

FIG. 21 is a side view of the main part of the peeling means of the stencil printing apparatus shown in FIG. 17, showing a state where the heat-sensitive stencil film has begun to be peeled from the master by the wedge-shaped member.

FIG. 22 is a plan view showing still another example of the master of the stencil printing apparatus.

FIG. 23 is a plan view showing still another example of the master of the stencil printing apparatus.

FIG. 24 is a perspective view of a main part showing a modified example of the front peeling means.

25 is a side view of the main part of the front peeling means of the stencil printing apparatus shown in FIG. 24, showing a state where the master is initially set.

26 is a side view of the main part of the peeling means of the stencil printing apparatus shown in FIG. 24, showing a state in which the heat-sensitive stencil film has begun to be peeled from the master by the front peeling means.

27 is a side view of a main part of a peeling unit of the stencil printing apparatus shown in FIG. 24, showing a state where the heat-sensitive stencil film has started to be peeled from the master by the wedge-shaped member.

[Explanation of symbols]

 1 plate cylinder 2 clamper 14 as a locking means 14 plate making means 15, 150, peeling means 8 thermal head 9 platen roller 10 delivery roller 11 transport roller 13 wedge-shaped member 20 master 21 base film 22 heat sensitive stencil film 25, 26 separation roller 41 sticking Attachment parts 151, 152 Front peeling means P Transport path

Claims (6)

[Claims] 1. A means for locking a heat-sensitive stencil film on a plate cylinder while pulling out a master for a heat-sensitive stencil in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are removably pasted together and wound in a roll shape. In the stencil printing apparatus which writes a perforated image according to the document image information by the plate making means while carrying the sheet toward the plate cylinder and winds the image on the outer peripheral surface of the plate cylinder for printing. A stencil printing machine having a peeling means which is provided in a conveyance path of the master between the means and a means for peeling the base film from the master. 2. The stencil printing apparatus according to claim 1, wherein the peeling means is located on the conveying path and is arranged at a boundary portion between the heat-sensitive stencil film and the base film, and the heat-sensitive stencil film is attached to the heat-sensitive stencil film. Towards the locking means,
A wedge-shaped member for peeling the base film in a direction different from the locking means, a conveying roller for conveying the heat-sensitive stencil film pressed against the lower surface of the wedge-shaped member and peeled to the locking means, and the wedge-shaped member. A stencil printing machine having a feed roller that conveys the base film that is pressed against the upper surface of the member and peeled off. 3. A means for locking a heat-sensitive stencil film on a plate cylinder while pulling out a master for a heat-sensitive stencil in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are removably pasted together and wound in a roll shape. In the stencil printing apparatus for printing while printing the perforated image according to the document image information by the plate making means while being conveyed toward, and winding only the heat-sensitive stencil film around the outer peripheral surface of the plate cylinder for printing. The locking means is provided on a part of the outer peripheral surface of the plate cylinder, holds the heat-sensitive stencil film by the adhesive force or the suction force, and the adhesive force or the suction force acting between the locking means and the heat-sensitive stencil film. The force is a holding member that is stronger than the adhesive force acting between the heat-sensitive stencil film and the base film, and presses the leading end of the master in which the perforated image is written against the holding member. The pressing means and discharge means arranged near the downstream side of the pressing means in the conveying direction of the base film to convey the base film in a direction other than the holding member are held on the holding member by the pressing means. A stencil printing machine for peeling the obtained heat-sensitive stencil film from the base film by the plate cylinder and the discharging means. 4. A master of a stencil printing apparatus in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably bonded together, wherein the master is a perforated image in which the heat-sensitive stencil film and the base film are bonded together. A master of a stencil printing apparatus having a sticking part, which is a region in which is written, and a non-sticking part in which the heat-sensitive stencil film and the base film are not stuck to each other, at the tip of the sticking part in the master transport direction. 5. The stencil printing apparatus according to claim 4, wherein an opening for peeling the base film from the heat-sensitive stencil film is provided in a part of the base film in the unattached portion. Master of. 6. The stencil printing apparatus according to claim 2, wherein a sticking portion, which is an area in which a perforated image obtained by sticking a heat-sensitive stencil film and a base film is written, and a tip portion of the sticking portion in the master transport direction. The heat-sensitive stencil film and the base film have an unattached portion in which the base film is not attached, and a part of the base film of the unattached portion has an opening for peeling the base film from the heat-sensitive stencil film. A stencil printing apparatus provided with a pre-peeling means for starting the peeling of the base film from the heat-sensitive stencil film by pushing down the heat-sensitive stencil film from the opening of the master.