JP2820863B2 - Stencil printer and its master - Google Patents

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 for wrapping a master for heat-sensitive stencil pierced by stencil making means around a plate cylinder and performing printing, and a stencil printing machine master.

[0002]

2. Description of the Related Art A master for heat-sensitive stencil printing used in a stencil printing machine includes a very thin thermoplastic synthetic resin film such as polyester and a synthetic fiber, Japanese paper or Japanese paper as a porous flexible support. And a laminate structure in which synthetic fibers and a mixture of synthetic fibers are firmly bonded.
The stencil printing machine responds to this master in the main scanning direction.
A thermal head having resistive heating elements arranged in rows is brought into contact with each other, and a master is relatively moved to the thermal head by a platen roller in a sub-scanning direction orthogonal to the arrangement direction of the resistive heating elements. A perforated image is formed in the form of a dot matrix by heating, the master on which the perforated image is formed is conveyed by a conveying roller, and the leading end of the master is clamped by clamping means provided on the outer peripheral surface of the plate cylinder. Is automatically wound around the outer peripheral surface of the master, the master is cut by the cutter means, and the printing paper is continuously pressed against the master by a pressing means such as a press roller, so that the ink is exuded from the perforated portion of the master to perform printing. I have.

[0003]

Since the above master uses Japanese paper or the like as its support, the passage of the ink is hindered at the portion where the Japanese paper fibers are entangled, so that the ink does not transfer to the printing paper. A problem such as a so-called fibrous grain in which a fiber pattern appears or a thin line or the like is blurred occurs.
Also, at the start of printing, after the support holds a certain amount of ink, the ink passes through the holes of the thermoplastic synthetic resin film, so it is difficult to print immediately after winding the master around the plate cylinder. The ink does not spread evenly, and a large amount of printing paper is required to make the ink uniform, resulting in waste of printing paper. Also, at the time of plate discharging, the ink held by the support is also discarded together with the master, so that there is a problem that the consumption of ink increases.

[0004] Therefore, by performing printing using a master made of only a thermoplastic synthetic resin film without using Japanese paper or the like as a support, it is possible to prevent generation of fibrous grains. The thickness of the synthetic resin film itself is about 1 to 8 μm, which is extremely thin compared to the thickness of the Japanese paper laminate master of about 40 to 50 μm,
Further, since the thermoplastic synthetic resin film is a high insulator, it tends to be easily charged with static electricity, so that jamming or the like frequently occurs when the film is wrapped around a transport roller or stuck to a guide member. Also, if it is attempted to make only a thermoplastic synthetic resin film with a thermal head, wrinkles called plate-making wrinkles are generated due to the heat shrinkage of the thermoplastic synthetic resin film.

As described above, since a master made of only a 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. Or the thickness of the thermoplastic synthetic resin film is increased to increase the strength of the thermoplastic synthetic resin film and improve the transportability. However, when the thickness of the thermoplastic synthetic resin film is increased, it becomes impossible to perforate unless the temperature of the heating element such as the thermal head is increased, so that the durability of the thermal head is significantly reduced. If there is too much, a problem that a hole cannot be made occurs, and the cost is greatly increased.

[0006] Since the above-mentioned clamping means has a strong magnetic effect or is provided with a high friction member on the master contact surface of the clamping means, the clamping means becomes large,
Because it becomes thicker and protrudes from the outer peripheral surface of the plate cylinder, the contact distance of the press roller becomes longer. Therefore, there is a problem that the press roller generates noise because it can be operated at a high speed over a long distance.

Therefore, the present invention solves the above-mentioned problems, provides a master which is inexpensive, has good transportability, and does not generate plate-making wrinkles. An object of the present invention is to provide a novel stencil printing apparatus capable of obtaining a printed image.

[0008]

According to the first 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 the roll-shaped heat-sensitive stencil master is pulled out and transported toward the heat-sensitive stencil film locking means of the plate cylinder. Meanwhile, in the stencil printing apparatus that writes a perforated image according to the original image information by the stencil making means during the conveyance, and wraps around the outer peripheral surface of the plate cylinder to perform printing, the stencil printing machine between the stencil making means and the locking means provided in the transfer path of the master, it has a peeling means for peeling the base film from the master, the release hands
The step is on the conveyance path, and the heat-sensitive stencil film and
It is placed at the boundary of the base film and
Aim the heat-sensitive stencil film toward the locking means, and
Wedge-shaped part for peeling the film in a direction different from the above-mentioned locking means
Material and comes into contact with one surface of the wedge-shaped member and peels off.
A transfer roller for transferring the heat-sensitive stencil film to the locking means.
Roller and the other surface of the wedge-shaped member and come off.
A delivery roller for transporting the base film.
Have

According to a second aspect of the present invention, the heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably attached to each other and the roll-shaped master for the heat-sensitive stencil is pulled out while pulling out the master. In the stencil printing apparatus, the stencil printing apparatus writes a perforated image in accordance with the original image information by the stencil making means while the stencil film is being conveyed toward the locking means and winds the stencil film around the outer peripheral surface of the stencil cylinder for printing. The master is provided in the transport path of the master between the plate making means and the locking means, has a peeling means for peeling the base film from the master, the peeling means, a pair of nipping the tip of the master A peeling roller, detecting means for detecting the nipping of the master tip by the peeling roller, and detecting the nipping of the master tip by the detecting means. And control means for rotating each other in opposite directions the peeling roller and has a.

According to a third aspect of the present invention, a heat sensitive stencil film and a base film supporting the heat sensitive stencil film are releasably adhered to each other and the heat sensitive stencil master is drawn out while being rolled out. While conveying the stencil film toward the locking means, a perforated image is written by the stencil making means according to the original image information during the conveyance, and only the thermosensitive stencil film is wound around the outer peripheral surface of the plate cylinder for printing. In the stencil printing machine, 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 is provided between the locking means and the heat-sensitive stencil film. The acting adhesive or suction force is a holding member that is stronger than the sticking force acting between the heat-sensitive stencil film and the base film. A pressing means for pressing the serial holding member,
Discharging means arranged near the downstream side of the pressing means in the conveying direction of the base film, for conveying the base film in a direction other than the holding member; and a heat-sensitive stencil held on the holding member by the pressing means. 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, there is provided a stencil printing machine in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably bonded to each other. An attached portion that is an area where the combined punched image is written, and an unattached portion that is continuously formed at the tip of the attached portion in the length direction of the master and that has a band shape in a direction crossing the master. And the pasted portion and the non-pasted portion are formed alternately and repeatedly in the master length direction.

According to a fifth aspect of the present invention, there is provided a master of a stencil printing machine in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably bonded to each other. Has a sticking part which is a region where a perforated image is written, and a non-sticking part in which the heat-sensitive stencil film and the base film are not stuck to the leading end of the sticking part in the master transport direction. 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.

[0013] According to a sixth aspect of the invention, in the stencil printing machine according to claim 1, and a bonded portion is a region where the perforation image formed by bonding a heat-sensitive stencil film and the base film is written, the adhesive portion The unadhered portion where the heat-sensitive stencil film and the base film are not bonded to the leading end in the master transport direction, and a part of the base film of the non-adhered portion, for peeling the base film from the heat-sensitive stencil film. And a pre-peeling means for pushing down the heat-sensitive stencil film downward from the opening of the master having the above-mentioned opening to start peeling the base film from the heat-sensitive stencil film.

[0014]

According to the first aspect of the present invention, the master on which the document image information is written is separated into the heat-sensitive stencil film and the base film by the wedge-shaped member arranged on the conveyance path, and the separated heat-sensitive stencil film is separated. Is by the transport roller,
It is conveyed toward the locking means on the outer peripheral surface of the plate cylinder and is wound around the outer peripheral surface of the plate cylinder.

According to the second aspect of the present invention, when the master on which the original image information is written is detected by the pair of peeling rollers that sandwich the leading end of the master to grip the leading end of the master, the peeling roller is moved. By rotating them in opposite directions, they are peeled off from the heat-sensitive stencil film and the base film, conveyed 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 present invention, the thermosensitive stencil film, which is held by the holding member by the pressing means and has the original image information written thereon, is peeled off from the base film by the plate cylinder and the discharging means, Is wound on the outer peripheral surface of.

According to the fourth aspect of the present invention, the master comprises:
The sticking portion, which is a region where a perforated image in which the thermosensitive stencil film and the base film are stuck together is written, and the heat sensitive stencil film and the base film are not stuck at the leading end of the sticking portion in the master transport direction. And a sticking part.

According to the fifth aspect of the present invention, since the opening is provided in a part of the base film at the unattached portion, the base film is peeled off from the heat-sensitive stencil film.

According to the sixth aspect of the present invention, the master on which the original image information has been written is pushed down the heat-sensitive stencil film from the opening by the pre-peeling means, and peeling of the base film from the heat-sensitive stencil film is started. You. The peeled heat-sensitive stencil film is conveyed by a conveying roller toward a locking means on the outer peripheral surface of the plate cylinder, and is 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 denotes a master supply device in a thermosensitive stencil printing apparatus. Master supply device 100
Is a pair of first stencil feed rollers 7c and 7d that unwinds a heat-sensitive stencil printing master 20 in which a heat-sensitive stencil film 22 and a base film 21 supporting the heat-sensitive stencil film 22 are peeled off and wound in a roll shape. And a clamper 2 which is provided on the outer peripheral surface of the porous cylindrical plate cylinder 1 and locks the leading end of the heat-sensitive stencil film 22.
Plate making means 14 for writing image information by means of a platen roller 9 on a master 20 and a thermal head 8 provided to be able to contact and separate from the platen roller 9;
A peeling means 15 disposed on the transport path p between the master 20 and the clamper 2 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; It mainly comprises a pair of second plate feeding rollers 7a and 7b which are provided between the peeling means 15 and convey the master 20 on 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 to 10 μm, and a base film 21 supporting the heat-sensitive stencil film 22 are wound together in a roll form so as to be peeled off with a force of 150 g to 800 g,
It is supported on the shaft 5 so that it can be extended. The base film 21 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 where the heat-sensitive stencil film 22 and the base film 21 are not bonded 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 the inner peripheral surface and a mesh screen layer forming the outer peripheral surface. (Only the support layer is shown in FIG. 1.) The plate cylinder 1 is rotatably supported around a rotation center axis also serving as the 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, is provided so as to be openable and closable, and has a well-known structure in which the master is held and attracted by magnetic action.

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

The thermal head 8 extends parallel to the platen roller 9 and is provided so as to be able to freely contact and separate from the platen roller 9 by a contact / separation mechanism (not shown). The thermal head 8 has a well-known function of selectively melting and perforating the master 20 based on a digital image signal processed and transmitted by an A / D converter and a plate making controller (both not shown) of a document reading unit (not shown). Having.

The peeling means 15 is disposed at the bonding boundary between the heat sensitive stencil film 22 and the base film 21 in the transport path p, and peels off the master 20 into the heat sensitive stencil film 22 and the base film 21; Wedge-shaped member 1
Heat-sensitive stencil film 22 which is pressed against the lower surface of 3 and peeled off
The transport roller 11 transports the base film 21 toward the locking means 2, and the feed roller 10 transports the base film 21 that comes into contact with the upper surface of the wedge-shaped member 13 and peels off. The transport roller 11 and the feed roller 10 are set so as to rotate in the direction of the arrow at the same peripheral speed.

The heater wire 12 extends 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 in a direction crossing the heat-sensitive stencil film 22 and is constituted by a nichrome wire. The surface is coated with a fluororesin film.

Inside the plate cylinder 1, an ink roller 56 for supplying ink to the inner peripheral surface of the plate cylinder 1, and an ink roller 56 are arranged in parallel with a slight gap from the ink roller 56.
Roller 58 that forms an ink reservoir 57 between
And an ink pipe 5 for supplying ink to the ink reservoir 57
5 are arranged. Here, the ink roller 56, the doctor roller 58, and the ink pipe 55 constitute an ink supply device.

Below the master supply device 100, a paper supply device 200 is arranged. The paper supply device 200 includes:
A press roller 3 that swings 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 plate 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
Roller 6 for distributing the printing paper 59 placed on the paper
2 and the printing paper 59 pressed against the paper distribution roller 62
And a separation roller 63 for separating into sheets.

On the left side of the plate cylinder 1 in FIG.
0 is provided. The plate discharge unit 300 is configured to store a used heat-sensitive stencil film (not shown) removed 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 discharging rollers 4a and 4b for peeling and transferring.

Next, the operation of the stencil printing apparatus will be described below. First, the master 20 supported so as to be able to be extended on the shaft 5 is passed between the thermal head 8 and the platen roller 9 to be drawn out to the wedge-shaped member 13, and as shown in FIG. The base film 21 of the unattached portion 42 of the master 20 described above
Between the transport roller 11 and the wedge-shaped member 13.
The initial setting of the master 20 is performed by sandwiching the heat-sensitive stencil films 22 of the second embodiment.

Next, when a plate making start key (not shown) is pressed, a plate making command is sent to a step motor (not shown), and the platen roller 9 starts rotating, and both are processed by an A / D converter and a plate making controller (not shown). According to the digital image signal transmitted and transmitted, the resistance heating element of the thermal head 8 which is in pressure contact with the platen roller 9 across the master 20 is selectively heated, and the master 20 is selectively melted and perforated. Then, the pierced master 20 is conveyed to the upstream side of the peeling means 15.

The plate making command is sent to the feed roller 10 and the transport roller 11, and the feed roller 10 and the transport roller 11 rotate. As the rollers 10 and 11 rotate, the base film 21 is peeled off from the master 20 at the end 13 a of the wedge-shaped member 13. Thereafter, 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 down by its own weight, and is sent out to the expanded clamper 2.

Next, as shown in FIG. 4, the leading end of the thermosensitive stencil film 22 is locked by closing the clamper 2 at a predetermined timing, and at the same time as this clamping operation, the plate cylinder 1 is moved in the arrow X direction. By being rotated, 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 around 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 generate heat. As shown in FIG. The stencil film 22 is blown. Immediately after the thermal stencil film 22 is blown, the rotation of the platen roller 9 stops. Thereafter, as shown in FIG. 6, the blown thermosensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1. As described above, since the heater wire 12 is disposed slightly downstream of the nip portion n between the lower surface of the wedge-shaped member 13 and the transport roller 11, the heat-sensitive stencil film 22 is blown off by the heater wire 12. Also heat-sensitive stencil film 22
Are held by the transport rollers 11. After the heat-sensitive stencil film 22 is blown, the transport roller 11 slightly rotates to feed the next leading end of the heat-sensitive stencil film 22 to the initial set position.

After the thermosensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1, a printing process is started. First, paper feeder 6
The printing paper 59 placed on the registration roller pair 60 is separated by a paper distribution roller 62 and a separation roller 63 one by one.
Conveyed toward. The registration roller pair 60 inserts the conveyed printing paper 59 into a 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. Then, the press roller 3, which has been 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 printing drum 1, the ink is released from the apertures 1 of the plate cylinder 1.
a, It passes through the perforated portion of the thermosensitive stencil film 22 and is 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 separated from the plate cylinder 1 by a peeling nail (not shown).
Is peeled off from the outer peripheral surface, and the so-called printing is completed by the first printing of the first sheet. Next, a predetermined number of prints are sequentially and continuously performed by the same operation as the above operation.

When printing is completed and the image of the next original is to be printed, the previously used heat-sensitive stencil film (not shown) is used before newly wrapping the heat-sensitive stencil film 22 on 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 direction of the arrow X, and stops at a position where the plate discharge roller 4a is pressed against the rear end of the heat-sensitive stencil film. At the same time, the plate discharge rollers 4a and 4b are moved in the direction of the arrow X and the arrow X, respectively. The plate discharge roller 4a is pressed against the used heat-sensitive stencil film rear end on the outer peripheral surface of the plate cylinder 1 to start peeling. At this time, the plate cylinder 1 resumes rotation in the direction opposite to the arrow X direction. The used master peeled from the outer peripheral surface of the plate cylinder 1 is discarded into the plate discharge box 64. Thereafter, the plate cylinder 1 stops at a predetermined position,
The machine enters the plate feeding standby state.

In the above-described embodiment, the base film 21 peeled off by the peeling means 15 is removed from the pair of discharge rollers 16a, 1a.
The base film cutter 18 cuts the base film 21 for each plate between the pair of discharge rollers 16a, 16b and the peeling means 15, as shown in FIG.
And a waste box 64 for storing the cut base film 21 and guide roller pairs 16c and 16d for guiding the cut base film 21 into the waste box 64 to cut the base film 21 for each plate. May be discarded. According to this configuration, more base films 21 can be discarded in a waste box of the same size as in the above-described embodiment. Reference numeral 17 denotes a jam cutter that cuts the master 20 when the jam occurs.

Also, as shown in FIG.
A take-up roller 19 for the base film 21 may be provided downstream of 6a and 16b so that the base film 21 is taken up. According to this configuration, as compared with the example shown in FIG. 7, the base film cutter 18 and the disposal box 64 become unnecessary, and the number of parts is reduced.

FIG. 9 shows an example of another master 120. The master 120 has an unattached portion 42 where the heat-sensitive stencil film 22 and the base film 21 are not bonded to one end of the master 120 and a heat-sensitive stencil film 22 and the base film 21 which are parallel to the conveying direction of the master 120. It is formed by the stuck part 41 stuck. Reference numeral 43
Indicates the boundary between the unattached portion 42 and the attached portion 41. Master 1
20 is formed as shown in FIG.
If the master 20 is jammed and the master 120 is cut halfway, the base film 21 can be easily peeled off from the master 120, and the initial setting and the like can be simplified. Further, the unattached portion 42 is moved in parallel with the transport direction of the master 120 so that the master 1
20 may be provided at both ends.

FIG. 10 shows a modification of the embodiment shown in FIGS. The peeling means 150 shown in this embodiment is different from the embodiment shown in FIGS.
a peeling rollers 25 and 26 disposed downstream of the a and 7b to peel 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 disposed 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, is transferred to the clamper 2. Third plate feeding roller 65 conveyed toward
And a heater wire 66 that is disposed between the third plate feeding roller 65 and the clamper 2 and that blows the thermosensitive stencil film 22. The heater wires 66 extend in a direction crossing the heat-sensitive stencil film 22, and are supported at both ends by insulating holders 66a.
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 (not shown).

The operation of the peeling means 150 will be described with reference to FIG.
Only the differences from the embodiment shown in FIG. 9 to FIG. 9 will be described. First, the master 20 is pulled out to a position slightly downstream of the platen roller 9, and the leading end 20 a thereof is initially set in a state of being aligned substantially parallel to the platen roller 9. As shown in FIG. 11A, the leading end 20a of the master 20 on which the perforated image has been written in the same manner as in the above-described embodiment is moved to a position slightly passing through the peeling rollers 25 and 26, as shown in FIG.
The sheet is conveyed by plate feeding rollers 7a and 7b. At this time, the sensor 67 detects the master 20 and sends a detection signal to the control means 68.
To enter. The control means 68 controls a driving means (not shown) of the peeling roller 26 based on this signal to rotate the peeling roller 26 in the reverse direction. Thereafter, as shown in FIG. 11B, the heat-sensitive stencil film 22 starts to be peeled from the base film 21. With further rotation of the peeling roller 26, the leading end 22a of the heat-sensitive stencil film 22 is completely pushed out to the upstream side of the peeling roller 26, hangs down by its own weight, is sandwiched by the third plate feeding roller 65, and is clamped by the third plate feeding roller 65. Transported to

As described in the above embodiment, the heat-sensitive stencil film 22
Is wound around the outer peripheral surface of the plate cylinder 1 for a predetermined length, and the heater wire 66 is energized from a power supply source (not shown).
6 generates heat. At the same time, a signal command based on this length is sent to a swinging means (not shown), and the insulating holder 66a
Then, the heated heater wire 66 is swung from the position shown by the solid line in the drawing to the position where it contacts the heat-sensitive stencil film 22 (shown by the two-dot chain line in the drawing), and the heat-sensitive stencil film 22 is blown. Thereafter, 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 20 of the master 20 is
It is not necessary to form the unattached portion 42 on a, and the cost is reduced. Further, the initial setting of the master 20 is simplified.

FIG. 12 shows another embodiment. The master supply device 110 shown in this embodiment is different from the embodiment shown in FIGS. 1 to 11 in that the heat-sensitive stencil film 22 is disposed on the conveyance path P of the master 20 on the upstream side of the second plate-feed rollers 7a and 7b.
A heater wire 36 provided at a position facing the heater wire 36 to press the master 20 against the heater wire 36, and a heat sensitive stencil film 22 provided along the generatrix on the outer peripheral surface of the plate cylinder 1. Locking means 6 constituted by a thin plate-like holding member 31 for holding by force or suction force
9 and the tip 20 of the master 20 on which the perforated image is written
a pressing means 32 for selectively pressing a to the holding member 31;
A discharge unit that includes discharge rollers 34 a and 34 b disposed near the downstream side of the pressing unit 32 in the conveyance direction of the base film 21 and conveys the base film 21 in a direction other than the holding member 31 and the take-up roller 19; Plate roller 7b
And a holding member 3 disposed near the outer peripheral surface of the plate cylinder 1.
Only the configuration having a cleaning roller 37 that can be separated from and separated from the cleaning roller 37 is different.

The holding member 31 is made of soft urethane rubber, viscous synthetic rubber, or a sheet on which a number of micro suction cups are formed, and is attached to the surface of the plate cylinder 1 with an adhesive. Holding member 31 and heat-sensitive stencil film 2
2 is set 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 as to be able to contact and separate from the holding member 31, and is formed of a water-retaining substance such as a sponge. The pressing means 32 is configured to be able to selectively press the master 20 against the holding member 31 by a contact / separation mechanism (not shown).

The operation of this embodiment will be described with reference to FIGS.
Only the differences from the embodiment shown in FIG.
First, the master 20 is pulled out to the take-up roller 19,
The heat-sensitive stencil film 22 is peeled off from the master 20, and the base film 21 is locked on the take-up roller 19. Thereafter, as shown in FIG. 12, the 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.

As shown in FIG. 12, the leading end 22a of the heat-sensitive stencil film 22, on which the perforated image is written, is connected to the plate cylinder 1 and the pressing means in the same manner as in the operation of the embodiment shown in FIGS.
To between the pressing member 32 as a second plate feed rollers 7a, 7
b, and are conveyed by the discharge rollers 34a and 34b. At a predetermined timing, a contact / separation mechanism (not shown) of the pressing member 32 operates, and the pressing member 32 descends as shown in FIG.
The master 20 is pressed against the holding member 31. At the same time, the plate cylinder 1 starts rotating in the direction of the arrow Y, and the front end portion 22 a of the thermosensitive stencil film 22 is held on the surface of the holding member 31.

The adhesive force or suction force acting between the holding member 31 and the heat-sensitive stencil film 22 is
14 is stronger than the sticking force acting between the base member 21 and the base film 21, the plate cylinder 1 and the discharge rollers 34 a and 34 b are further rotated in a state where the pressing member 31 is pressed against the master 20. As shown in (1), the thermosensitive 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 supplied with electricity from a power supply source (not shown) to generate heat, so that only the heat-sensitive stencil film 22 is blown. You. Thereafter, the blown heat-sensitive stencil film 22 is wound around the outer peripheral surface of the plate cylinder 1, and when the leading end portion 22a of the next heat-sensitive stencil film 22 reaches the above-described initial 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 stops. 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 plate discharging, the cleaning roller 37 is brought into contact with the holding member 31 by a mechanism (not shown), and the rotation of the plate cylinder 1 removes dirt from the holding member 31. Note that the cleaning roller 37 may be constituted by a brush.

Further, the discharge rollers 34a and 34b may be omitted, the discharge means may be constituted only by the take-up roller 19, and the take-up roller 19 may be arranged near the downstream side of the pressing means 32.

FIG. 15 shows another example of the master 121. The master 121 has a sticking portion 4 which is an area where a perforated image in which the thermosensitive stencil film 22 and the base film 21 are stuck to the master 120 shown in FIG. 9 is written.
1 and an unattached portion 42 in which the heat-sensitive stencil film 22 and the base film 21 are not attached to the leading end of the attached portion 41 in the master transport direction. Not yet
The sticking section 42 has a band shape in a direction crossing the master,
Is set to 1 cm or more in order to peel the base film 21 from the master 121 in the length direction . The sticking part 41 and the non-sticking part 42 are
It is formed alternately and repeatedly in the length direction. Master 12
If 1 is jammed in the stencil printing machine, the master 12
1 is cut by a cutter or the like in a direction crossing the master 121 from a slightly upstream side of the boundary 43 on the leading end side of the unattached portion 42 in the transport direction of the master 121 on the upstream side from the jammed position. Should be set initially. According to the master 121, the base film 21 can be easily peeled 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 manner, the detection of the unattached portion 42 becomes easy.

Further, as shown in FIG.
2, a row of holes 44 for cutting the master 121a may be provided in a direction crossing the master 121a. According to this configuration, when the master 121a is jammed, the master 121a can be easily cut off at the hole row 44.

FIGS. 17 to 21 show still another embodiment. The master supply device 111 shown in this embodiment has the configuration shown in FIG.
14 to the embodiment shown in FIG. 14, a sticking portion 41 which is a region where a perforated image in which the heat-sensitive stencil film 22 and the base film 21 are stuck together is written, and a transfer direction of the master 122 of the sticking portion 41. Heat-sensitive stencil film 22 at the tip
And the base film 21 are not bonded to each other, and an opening (opening) for peeling the base film 21 from the thermosensitive stencil film 22 in a part of the base film 21 of the non-bonding part 42. Master 12 having 45
2 (see FIG. 18) through the opening 45 of the heat-sensitive stencil film 22.
Is depressed downward to start peeling of the base film 21 from the heat-sensitive stencil film 22, and the heat-sensitive stencil film 22 from which the base film 21 has been peeled off by the pre-peeling means 151 is moved between the wedge-shaped member 13 and the transport roller 11. The only difference is the configuration having a guide plate 52 for guiding between them.

The pre-peeling means 151 is provided with the second plate feeding roller 7.
a, a compressor (not shown) which has an air outlet 51 at a position near the base film 21 between the a and 7b and the wedge-shaped member 13 and opposed to an opening 45 formed in the conveyed base film 21; And selectively blows air from the air outlet 51 to the thermosensitive stencil film 22 through the opening 45.

With respect to the operation of the pre-peeling means 151 of this embodiment, only 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 from the second plate feeding rollers 7a and 7b, and the leading end 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 wedge-shaped member 1
3, the air outlet 51 of the pre-peeling unit 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 pre-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 off from the heat-sensitive stencil film 22. Further, as shown in FIG. 21, the rotation of the second plate feeding rollers 7a and 7b causes the base film 21 to be located between the delivery roller 10 and the wedge-shaped member 13, and the heat-sensitive stencil film 22 to be moved between the transport roller 11 and the wedge-shaped member 13. Between each other. Other operations are the same as 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.
As shown in FIG. 3, the boundary 4 between the unattached portion 42 and the attached portion 41
3 may be provided with a row of holes 44 for cutting the master 122 in a direction crossing the master 122. According to this configuration, when the master 122 is jammed, the sticking portion 41 becomes a waist at the time of cutting, and it is easy to cut.

FIGS. 24 to 27 show another pre-peeling means 15.
2 shows an example. The pre-peeling means 152 is inserted into the opening 45 of the base film 21 with respect to the pre-peeling means 151 shown in FIGS.
Is depressed downward to release the base film 21 from the heat-sensitive stencil film 22, and a diagram in which the release pin 54 is selectively rocked to a position separated from the base film 21 and to a position for pressing the heat-sensitive stencil film 22 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 from the second plate feeding rollers 7a and 7b, and the leading end 122a is pulled out of the second plate feeding rollers 7a and 7b.
Initially set in a state where they are aligned substantially parallel to. The master 122 on which the perforated image is written in the same manner as in the above-described embodiment is shown in FIG.
4. As shown in FIG. 26, the sheet is transported toward the wedge-shaped member 13 by a predetermined length, and the peeling pin 54 of the front peeling means 152 and the opening 45 of the base film 21 face each other. At the same time, a swinging mechanism (not shown) is operated, and 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 downward, and the heat sensitive stencil film is moved. The base film 21 is peeled off from the base film 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 rotations of a and 7b. . Other operations are the same as those of the embodiment shown in FIGS. In addition, the configuration of the pre-peeling unit 151 and the configuration of the pre-peeling unit 152 described above are used in combination, and a swing mechanism is provided in the air outlet 51 so that the air outlet 51 is connected to the opening 4 of the base film 21.
5 may be inserted.

[0060]

As described above, according to the first aspect of the present invention, the feeding roller transports the base film except when the master is initially set and when the master is jammed again. Since the base film is peeled from the master at the leading end of the wedge-shaped member while the roller sends out the thermosensitive stencil film, it is not necessary to peel off the leading end of the master every time a perforated image is written.

According to the second aspect of the present invention, the heat-sensitive stencil film and the base film are reliably separated from each other by rotating the pair of peeling rollers holding the leading end of the master in reverse, so that the heat-sensitive stencil film is removed from the plate cylinder. It is conveyed toward the locking means on the outer peripheral surface and wound around the outer peripheral surface of the plate cylinder.

According to the third aspect of the present invention, since the locking means is constituted by 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. And noise is reduced. Further, the peeling of the base film from the master becomes easy.

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 leading end of the bonding portion in the master transport direction, an unbonded portion is provided.
When the master is initially set again due to a jam of the master or the like, the base film can be peeled from the unattached portion of the cut master by cutting the master at the unattached portion. Easy to set.

According to the fifth aspect of the present invention, since an opening is provided in a part of the unattached portion of the base film, the base film is separated from the heat-sensitive stencil film by pressing the heat-sensitive stencil film through the opening. Becomes easier.

According to the sixth aspect of the present invention, a master having an opening 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 peeling of the base film from the heat-sensitive stencil film, and the peeling by the peeling means is ensured.

[Brief description of the drawings]

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

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

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

FIG. 4 is a side view of a main part of the peeling means shown in FIG. 3,
The state which the front-end | tip part of the heat sensitive stencil film was locked by the locking means is shown.

5 is a side view of a main part of the peeling means shown in FIG. 3,
This shows a state where the heat-sensitive stencil film is wound around the plate cylinder .

6 is a side view of a main part of the peeling means shown in FIG. 3,
2 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 modification of the embodiment shown in FIGS. 1 to 6;

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

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

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

11A is a side view of a main part of the peeling unit shown in FIG. 10, showing a state in which a master is initially set; FIG.
(B) is a side view of a main part of the peeling means shown in FIG. 10, showing a state where 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 machine shown in FIG. 12, showing a state where the master is pressed by a pressing means and held on a plate cylinder.

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

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 pre-peeling means of a stencil printing machine showing still another embodiment of the present invention.

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

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

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

21 is a side view of a main part of the peeling means of the stencil printing machine 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 modification of the pre-peeling means.

25 is a side view of a main part of the pre-peeling unit of the stencil printing machine shown in FIG. 24, showing a state where a master is initially set.

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

27 is a side view of a main part of the pre- peeling means of the stencil printing machine shown in FIG. 24, showing a state in which the heat-sensitive stencil film has begun to be peeled off from the master by the wedge-shaped member.

[Explanation of symbols]

Reference Signs List 1 plate cylinder 2 clamper as locking means 14 plate making means 15, 150 peeling means 8 thermal head 9 platen roller 10 feed roller 11 transport roller 13 wedge member 20 master 21 base film 22 heat sensitive stencil film 25, 26 peeling roller 32 pressing means Pressing member 41 as sticking part 42 Non-sticking part 59 Sensors 151 and 152 as detecting means for printing paper 67 Pre-peeling means P Transport path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41L 13/14 B41L 13/04

Claims (6)

(57) [Claims] 1. A means for locking a heat-sensitive stencil film of a plate cylinder while pulling out a roll-shaped heat-sensitive stencil master in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are peeled off and rolled out. In the stencil printing apparatus for writing a perforated image in accordance with the original image information by the stencil making means and wrapping it around the outer circumference of the stencil cylinder for printing while being conveyed toward the stencil making means, provided in the transfer path of the master between the means, have a peeling means for peeling the base film from the master, the release means is a said conveying path, said heat-sensitive stencil off
At the boundary between the film and the base film.
Placed, directing the heat-sensitive stencil film to the locking means,
Peeling the base film in a different direction from the locking means
A wedge-shaped member to be pressed and peeled by pressing against one surface of the wedge-shaped member.
Transport the released heat-sensitive stencil film to the locking means
A conveying roller for feeding, and the above-mentioned belt which comes into pressure contact with the other surface of the above-mentioned wedge-shaped member and is peeled off.
A stencil printing apparatus having a feed roller for conveying a base film . 2. A means for locking a heat-sensitive stencil film of a plate cylinder while pulling out a heat-sensitive stencil master which is releasably bonded to a base film supporting the heat-sensitive stencil film and wound in a roll. In the stencil printing apparatus for writing a perforated image in accordance with the original image information by the stencil making means and wrapping it around the outer circumference of the stencil cylinder for printing while being conveyed toward the stencil making means, And a peeling unit provided on a conveyance path of the master between the master and the base, the peeling unit peeling the base film from the master, the peeling unit includes a pair of peeling rollers for nipping a leading end of the master, and the peeling. Detecting means for detecting the nipping of the master tip by a roller; and removing the pair of peeling rollers when the nipping of the master tip is detected by the detecting means. A stencil printing apparatus, comprising: control means for rotating each in the opposite direction. 3. A means for locking a heat-sensitive stencil film of a plate cylinder while pulling out a heat-sensitive stencil master which is releasably attached to a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film and wound in a roll. In the stencil printing apparatus which performs perforation, writing a perforated image in accordance with the original image information by the stencil making means in the course of the conveyance, and winding and printing only the thermosensitive stencil film on the outer peripheral surface of the plate cylinder, The locking means is provided on a part of the outer peripheral surface of the plate cylinder and holds the heat-sensitive stencil film by the adhesive force or the suction force, and the adhesive force or suction acting between the locking means and the heat-sensitive stencil film. A holding member whose force is stronger than the sticking force acting between the heat-sensitive stencil film and the base film; Pressing means, and discharging means arranged near the downstream side of the pressing means in the conveying direction of the base film and conveying the base film in a direction other than the holding member, and held on the holding member by the pressing means A stencil printing machine for peeling the heat-sensitive stencil film from the base film by the plate cylinder and the discharging means. 4. In a stencil printing machine master in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably bonded, a continuous heat-sensitive stencil film and a base film are bonded together.
Affixing part, which is the area where the
Is continuously formed at the tip of the master
With a non-adhered part in a band shape in the direction crossing the master.
The stuck part and the non-stuck part alternately in the master length direction.
Master of stencil printing machine formed repeatedly . 5. A master of a stencil printing machine in which a heat-sensitive stencil film and a base film supporting the heat-sensitive stencil film are releasably bonded, wherein the master is a perforated image obtained by bonding the heat-sensitive stencil film and the base film. And an unattached portion in which the heat-sensitive stencil film and the base film are not attached to each other at the leading end of the attached portion in the master transport direction. A master of a stencil printing machine, wherein an opening for separating the base film from the thermosensitive stencil film is provided in a part of the base film. 6. A stencil printing apparatus according to claim 1, wherein a sticking portion is a region where a perforated image obtained by sticking the heat-sensitive stencil film and the base film is written, and a tip portion of the sticking portion in the master transport direction. The heat-sensitive stencil film and the unattached portion where the base film is not attached to the base film, 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 machine provided with a pre-peeling means for pushing down the thermosensitive stencil film from the opening of the master downward to start peeling the base film from the thermosensitive stencil film.