JPH06305232A - Stencil printer - Google Patents

Abstract

PURPOSE:To provide a stencil printer which prevents creases from occurring on a master in winding the master around a plate cylinder even though the master consisting of a thermoplastic resin film is used. CONSTITUTION:A stencil printer is equipped with the following an engaging means 50 which is provided on an outer peripheral surface of a plate cylinder and pinches a tip part of a film 10; a thermal head 14; a platen roller 12 which is freely separably provided to the thermal head 14, carries the film so as to wind the film 10 on the outer peripheral surface of the plate cylinder 1 while, pressing the film 10 onto the thermal head 14, and composes a process means 60 together with the thermal head 14; a cutting means 70 which cuts the film 10 by a specific length; and a carrying sheet 21 which reciprocates between the engaging means 50 and the process means 60 and carries the film 10 so as to be engaged with the engaging means 50 while being piled on the tip part of the film 10 at its tip part.

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 printing by winding a master punched with a heating element such as a thermal head.

[0002]

2. Description of the Related Art A conventionally used master is a laminate of a thin thermoplastic resin film (thickness of about 2 to 8 μm) and a porous support made of Japanese paper, synthetic fiber, or a mixture of Japanese paper and synthetic fiber. It is structured. This master is heated and perforated with a heating element such as a thermal head, wound around the plate cylinder, ink is supplied from the inside of the plate cylinder, and pressed by a pressing member such as a press roller, and the plate cylinder opening and the master perforation part are used. Printing is performed by bleeding out the ink and transferring it to the printing paper. Since the ink passes through fibers such as Japanese paper, which is the porous support of the master, there were parts in which the fibers were intricately entangled (damaged parts), or the fibers crossed the perforated part. In that case, there is a problem that the permeation thereof is obstructed and a so-called fiber pattern is generated such that a fiber pattern appears in a solid portion, fine lines are cut or faint.

Therefore, an attempt is made to reduce the defects due to the fiber grain by thinning the porous substrate such as Japanese paper which causes the fiber grain or printing only with the thermoplastic resin film without using the porous substrate. Has been done. However, the apparent strength of the conventional master is taken care of by the porous support, and when the porous support is thinned or when printing is performed with a master consisting of only a thermoplastic resin film, the master becomes a thin thermoplastic resin film. The strength (waist) will be significantly reduced.

On the outer peripheral surface of the plate cylinder of the conventional stencil printing machine, there is provided a locking member for holding the leading end of the master, which is composed of a stage section parallel to the axis of the plate cylinder and a clamper member. The clamper member is opened and closed by the opening and closing member every time a new master is wound, and the master tip portion is clamped.

Generally, the master is conveyed to the locking member by a platen roller or a feed roller provided on the downstream side of the master conveying direction. However, since the plate cylinder rotates, a guide plate or a feed roller for guiding the master is used. Since they may collide with the stage part and the clamper member, they cannot be provided so close to the plate cylinder. Therefore, it does not matter if the master is elastic like a master having a porous support, but the porous support is thin or has substantially no thermoplastic support. In the case of the master, when it reaches the locking member from the feed roller, it will be wrapped around the feed roller due to static electricity, etc. The phenomenon occurs. If clamped in this state, there was a problem that wrinkling would cause wrinkles on the plate cylinder, resulting in defective printing. Therefore, Japanese Patent Publication No. 62-2997 discloses a technique in which a master is pressed against the plate cylinder by wind pressure and clamped even without a waist without generating wrinkles.

[0006]

However, Japanese Patent Publication No. 62-
In the technique disclosed in Japanese Patent No. 2997, there is a problem that the tip portion of the master is swayed during air blowing, and if it is clamped as it is, wrinkles are further promoted.

[0007]

The invention according to claim 1 is
It is provided on the outer peripheral surface of a plate cylinder that is porous and rotatable.
Locking means for holding the tip of the master, a thermal head for selectively heating and punching the master according to image information, and a thermal head that is provided so as to be able to come into contact with and separate from the thermal head, and presses the master against the thermal head. While conveyed to be wound on the outer peripheral surface of the plate cylinder, a stencil printing apparatus comprising a platen roller that constitutes plate making means with the thermal head, and a cutting means that cuts the master into a certain length, A sheet member that reciprocates between the locking means and the plate making means, and the sheet member overlaps with the leading end of the master at its leading end while engaging the master with the locking means It is characterized in that it is transported to do so.

According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the cutting means further includes a heating member for cutting the master, and a heating member provided so as to come into contact with and separate from the heating member. When the sheet member is reciprocating between the locking means and the plate making means, the sheet member overlaps with the leading end portion of the master at its leading end portion, The platen roller and the pressing member are respectively retracted from the thermal head and the heating member.

According to a third aspect of the present invention, in the stencil printing apparatus according to the first aspect, a pressure-sensitive adhesive for polymerizing the sheet member and the master is further provided at a tip portion of the sheet member. And

According to a fourth aspect of the present invention, in the stencil printing machine according to the second aspect, the master and the sheet member are further sandwiched by the heating member and the pressing member, and the leading ends of the master and the sheet member. It is characterized in that the parts are fused by heating.

[0011]

According to the first aspect of the present invention, the sheet member reciprocating between the locking means and the plate-making means conveys the master until the tip of the master reaches the locking means in a state of overlapping with the master. To do.

According to the invention of claim 2, the master is
During the transportation, the thermal head for plate making and the heating member for cutting the master do not come into contact with each other.

According to the third aspect of the present invention, the adhesive is provided on the tip of the sheet member to surely polymerize the master on the sheet member, and the master is conveyed until the tip of the master reaches the locking means. .

According to the fourth aspect of the present invention, the master is surely polymerized on the sheet member without using an adhesive, and the master is conveyed until the leading end of the master reaches the locking means.

[0015]

1 and 2 showing a first embodiment of the present invention.
In FIG. 1, the plate cylinder 1 which is rotationally driven in the counterclockwise direction by a motor (not shown) has a stage portion 2 on its outer peripheral portion, which is parallel to its own axis and receives the leading end portion of the master. The clamper 3 that constitutes the locking means 50 together with the stage portion 2 and is provided in parallel with the stage portion 2 has a shaft 4 and a plate cylinder 1
It is pivotally attached to the outer peripheral surface of and is rotated by transmitting a driving force by an opening / closing member (not shown). As shown in FIG. 2, the rotating tip of the clamper 3 is formed in a comb tooth shape.

Inside the plate cylinder 1, an ink roller 5 that rotates in synchronization with the plate cylinder 1 and supplies ink to the plate cylinder 1 is provided so as to come into contact with the inner peripheral surface of the plate cylinder, and a doctor roller 6 is provided. Supplies the ink in the ink reservoir 7 formed in the wedge-shaped space between the ink roller 5 and the doctor roller 6 uniformly to the surface of the ink roller 5. Ink is supplied to the ink reservoir 7 through an ink pipe 8 by an external ink supply device.

A press roller 9 that is rotatable and presses the printing paper against the outer peripheral surface of the plate cylinder 1 is provided below the plate cylinder 1 so that the outer peripheral surface of the press roller 9 can be brought into contact with and separated from the outer peripheral surface of the plate cylinder 1. ing.

On the upper right side of the plate cylinder 1, a roll-shaped film 10 made of a thermoplastic resin as a master is rotatably supported by a support shaft 11. In the vicinity of the film 10, plate making means 60 including a platen roller 12 and a thermal head 14 having a heating element 13 incorporated therein is arranged. The platen roller 12 is supported at both ends by arms 15 and is driven to rotate counterclockwise by a stepping motor (not shown). One end 15a of the arm 15 having a substantially L shape
Supports the platen roller 12 and the opposite end
15b is engaged with the plunger of the solenoid 16. The arm 15 is rotatably supported by an arm shaft 17 that is inserted through the bent portion 15c, and is normally a compression spring whose one end is fixed to its end 15a and whose other end is fixed to the printer main body. The platen roller 12 is urged by 18 in a direction in which it is pressed against the thermal head 14.

On the downstream side of the thermal head 14 in the film transport direction, there is provided a heat generating roller 19 as a heating member which is rotatable and has a heat source inside, and below the heat generating roller 19.
A pressing roller 20 as a pressing member that can be brought into and out of contact with the heating roller 19 by pressing means (not shown).
Are rotatably arranged. The heating roller 19 and the pressing roller 20 constitute a cutting means 70, and the film 10
Is cut by the heat of the heating roller 19.

The film 10 is placed on the upper surface of the film transport path between the platen roller 12 and the thermal head 14 and between the heat roller 19 and the pressing roller 20, and the film 10 is used as the locking means 50. A conveyance sheet 21 as a sheet member that is conveyed to be locked is arranged. A rack 23 that is engaged with a pinion 22 that drives the transport sheet 21 is fixed to the lower surface of the end 21a of the transport sheet 21 that is opposite to the film transport direction.
The reciprocating drive is performed between a standby position and a locking position, which will be described later, by the rotational force of. The width of the transport sheet 21 is set larger than the width of the plate cylinder 1 in the axial direction, and the end portion 21b on the film transport direction side has a comb-teeth shape that meshes with the leading end portion of the clamper 3. And the tip portion thereof overlaps the tip portion of the film 10 being conveyed. When the conveying sheet 21 reciprocates between the standby position and the locking position, the conveying sheet 21
The guide 21 is positioned by being guided by guide plates 24 and 25 fixed to the printer body. On the upper surface of the guide plate 24,
Apertures 24a, 24b, 24c for passing the irradiation light from the position sensor described later are formed.

1 and 3 show a state of waiting for plate making. The film 10 is disposed on the downstream side in the transport direction,
The sheet is conveyed by a pair of feed rollers 26 which is rotated by a drive motor (not shown), and is guided by a guide shaft 27 arranged on the downstream side of the pair of feed rollers 26 in the film conveying direction. In the state of waiting for plate making, the leading end of the film 10 overlaps with the end 21b of the transport sheet 21 and is below the home position sensor 28 provided above the heat generating roller 19, and the heat generating roller 19 and the pressing roller are provided. Located between 20 and. This position is the home position of the transport sheet 21, and when the transport sheet 21 is at this home position, the platen roller 12 is pressed by the thermal head 14.

When a signal for starting the plate making is inputted, the solenoid 16 is energized to move the arm 15 downward against the compression spring 18 and retract the platen roller 12 from the thermal head 14. The plate cylinder 1 is stopped at the locking position where the locking means 50 is almost right above, and the clamper 3 is rotated counterclockwise. At the same time, the feed roller pair 26 and the pinion 22 rotate at the same speed by separate drive motors (not shown). Then, the film 10 and the conveying sheet 21 are superposed and conveyed along the guide plates 24 and 25 shown in FIG. 2, and the film 10 and the conveying sheet 21 eventually reach between the stage section 2 and the clamper 3. Transport sheet 21
The amount of conveyance of is detected by a locking position sensor 29 provided above the clamper 3. When the leading end of the transport sheet 21 superposed with the translucent film 10 passes under the locking position sensor 29, the locking position sensor 29 detects the leading end of the transport sheet 21 by the irradiation light, and the feed roller 26 And stop the drive motors of both pinion 22. This position is the locking position of the transport sheet 21, and its state is shown in FIG.

When the leading edge of the transport sheet 21 stops at the locking position, the clamper 3 is closed at the same time and the film
The tip of 10 is clamped by the stage 2. Then, the pinion 22 is rotated clockwise by a drive motor (not shown), and the transport sheet 21 moves to the right in the figure. When the leading edge of the conveying sheet 21 is detected by the standby position sensor 30 arranged between the feed roller pair 26 and the plate making means 60, the rotation of the pinion 22 is stopped and the movement of the conveying sheet 21 is stopped. This position is the standby position for the transport sheet 21, and its state is shown in FIG. Even in this state, the solenoid 16 is still energized, and the platen roller 12 is retracted from the thermal head 14. By the above series of operations, the locking means
Attachment of the film 10 to the 50 is completed.

When the attachment of the film 10 to the locking means 50 is completed, plate making is next performed. When the signal from the standby position sensor 30 is sent to the solenoid 16, the energization of the solenoid 16 is cut off and the platen roller 12 moves to the thermal head 14.
Then, it is pressed by the compression spring 18. Next, a stepping motor (not shown) that drives the platen roller 12 and a drive motor (not shown) that drives the plate cylinder 1 rotate counterclockwise at the same speed,
The film 10 is wound around the outer peripheral surface of the plate cylinder 1 while the heating element 13 built in the thermal head 14 performs a heating and punching operation based on the information of the printed original on the film 10. At this time, the transport sheet 21 is stopped at the standby position. This state is shown in FIG.

When the stepping motor driving the platen roller 12 determines that the film 10 has been conveyed for a predetermined length by the number of steps, the stepping motor is stopped and the rotation of the platen roller 12 is stopped. At the same time, energization of the heating roller 19 is started, and the pressing roller 20 is pressed by the pressing means (not shown) against the heating roller 19 that has generated heat due to energization, and the film 10 is cut. The state is shown in FIG. After the plate making is completed, the film 10 cut into a predetermined length is wound around the plate cylinder 1 and the winding is completed.

After the completion of the plate making operation and before the winding of the film 10 around the plate cylinder 1 is completed, the solenoid 16 is energized, the platen roller 12 retracts from the thermal head 14 and is not shown. By releasing the pressing means, the pressing roller 20 retracts from the heat generating roller 19. After that, the pinion 22 rotates counterclockwise, and the transport sheet 21 is moved to the left in the drawing. The state is shown in Figure 8.
Shown in.

When the transport sheet 21 moves and the home position sensor 28 detects the leading edge of the transport sheet 21, the rotation of the pinion 22 is stopped and the transport sheet 21 is positioned at the home position. When the rotation of the pinion 22 is stopped, the power supply to the solenoid 16 is cut off at the same time, and the platen roller 12
Is pressed by the thermal head 14 to enter the plate making waiting state shown in FIG. The plate making operation is completed by the series of operations described above.

After the plate making is completed, printing on the printing paper is performed. The sheet feeding device 31 disposed below the plate cylinder 1 is a printing sheet.
It has a paper feed table 33 on which 32 is loaded. The stacked printing papers 32 are fed by a paper feeding roller 34 arranged above the paper feeding device 31.
Then, the sheets are fed one by one by the feeding roller 35 and the feeding roller 35, and fed to the plate cylinder 1 by the feed roller 36. Printed paper sent
When 32 is guided by the guide plate 37 and reaches below the plate cylinder 1, the press roller 9 retracted from the plate cylinder 1 is pressed against the outer peripheral surface of the plate cylinder 1 by pressing means (not shown). At this time, the printing paper nipped between the plate cylinder 1 and the press roller 9
The ink that has passed through the perforated portion of the film 10 wound around the outer peripheral surface of the plate cylinder 1 is transferred to the 32, and printing is performed.

The printing paper 32 to which the ink has been transferred is a paper discharge device provided downstream of the press roller 9 in the paper feeding direction.
Delivered to 38. The paper discharge device 38 includes a belt conveyor device and a suction device, and uses the suction device to remove the ink-transferred printing paper 32 separated by the paper discharge claw 39 provided near the outer peripheral surface of the plate cylinder 1. While sucking, it is conveyed to the paper discharge table 40 by the belt conveyor device.

A second embodiment of the present invention is shown in FIG. In this embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

9 and 10 show a state of waiting for plate making. An adhesive 41 (acrylic rubber, styrene butadiene rubber, or the like) that polymerizes the transport sheet 21 and the film 10 is applied to the end portion 21b of the transport sheet 21, and the adhesive force causes the transport sheet 21 and the film 10 to adhere. Are reliably polymerized. The film 10 is guided by a guide shaft 27 arranged on the upstream side of the thermal head 14 in the film transport direction, and is transported by a platen roller 12 which is rotationally driven by a stepping motor (not shown). In the state of waiting for plate making,
The leading ends of the transport sheet 21 and the film 10 are in the position shown in the drawing in contact with the heat generating roller 19. This position is
When the transport sheet 21 is in this home position, the pressing roller 20 is retracted from the heat roller 19, but the platen roller 12
Is pushed upward by the urging force of the compression spring 18 and is in contact with the conveying sheet 21.

When a signal for starting plate making is input, the plate cylinder 1
Stops at the locking position where the locking means 50 is almost right above, and the clamper 3 rotates counterclockwise. At the same time, the platen roller 12 and the pinion 22 rotate at the same speed by a stepping motor and a drive motor (not shown). Then, the film 10 and the conveying sheet 21 are superposed and conveyed along the guide plates 24 and 25 shown in FIG.
And the clamper 3 are reached. The carry amount of the carrying sheet 21 is determined by the number of steps of the stepping motor, and when the number of steps reaches a set value, the stepping motor stops. This position is the locking position of the transport sheet 21, and its state is shown in FIG.

When the leading edge of the transport sheet 21 stops at the locking position, the clamper 3 is closed at the same time, and the film
The tip of 10 is clamped by the stage 2. Next, the solenoid 16 is energized, and the platen roller 12 retracts from the conveyance sheet 21. Then, the pinion 22 is rotated clockwise by a drive motor (not shown), and
21 moves to the right in the figure. When the leading edge of the transport sheet 21 is detected by the standby position sensor 30 arranged on the upstream side of the plate making means 60 in the sheet transport direction, the rotation of the pinion 22 is stopped, and the transport sheet 21 stops moving. This position is the standby position for the transport sheet 21, and its state is shown in FIG. By the series of operations described above, the attachment of the film 10 to the locking means 50 is completed.

When the signal from the standby position sensor 30 is sent to the solenoid 16, the power supply to the solenoid 16 is cut off,
The platen roller 12 is pressed against the thermal head 14 by the compression spring 18. Next, platen roller 12
The stepping motor (not shown) driving the plate cylinder 1 and the drive motor (not shown) driving the plate cylinder 1 rotate counterclockwise at the same speed, and the heating element 13 built in the thermal head 14 While performing the heat punching operation based on the information of the document to be printed on the film 10,
Is wound around the outer peripheral surface of the plate cylinder 1. At this time, the transport sheet
21 is stopped at the standby position. This state is shown in FIG.

The stepping motor driving the platen roller 12 determines the timing of starting the movement of the conveying sheet 21 based on the number of steps, and the pinion 22 is used to move the conveying sheet 21 at the same speed as the conveying speed of the film 10.
Starts rotating. The transport sheet 21 eventually moves between the rotating platen roller 12 and the thermal head 14, and as shown in FIG. 14, the film 10 is polymerized with the pressure of the platen roller 12 and the pressure sensitive adhesive 41. 10 is conveyed to the plate cylinder 1. When it is determined that the transport sheet 21 has reached the home position and the number of steps of the stepping motor has transported the film 10 for a predetermined length, the stepping motor is stopped and the rotation of the platen roller 12 is stopped. At the same time, energization of the heating roller 19 is started, and the pressing roller 20 is pressed by the pressing means (not shown) against the heating roller 19 that has generated heat due to energization, and the film 10 is cut. The state is shown in FIG. Transport sheet
21 is positioned at the home position and is in the plate-making waiting state shown in FIG. After the plate making is completed, the film 10 cut into a predetermined length is wound around the plate cylinder 1 and the winding is completed.

In each of the above-described embodiments, the clamper 3 and the end portion 21b of the conveying sheet 21 are in the shape of comb teeth which mesh with each other. By adopting this structure, since the clamper 3 and the conveying sheet 21 do not overlap each other when the film 10 is held by the locking means 50, the film 10 may be damaged when the conveying sheet 21 is pulled out. The film 10 is prevented from slipping out of the locking means 50 and the locking position of the film 10 shifting.

Further, in each of the above embodiments, when the thermal head 14 punches the film 10 by heating, the transport sheet 21 is returned to the standby position. Also, it is possible to prevent the heat generation energy from being dissipated from the thermal head 14 to the conveying sheet 21, the heat generation energy of the thermal head 14 can be reduced, and the life of the thermal head 14 and the conveying sheet 21 can be extended.

In each of the above embodiments, the transport sheet 21 is preferably a thin metal plate or a strong opaque resin plate. As a third embodiment of the present invention, a carrier sheet
The material of 21 is metal or conductive resin, and a high voltage power source is connected to this, and the film 10 is conveyed by the electric charge 21
Bind to static electricity. As a result, the film 10 and the transport sheet 21 can be reliably polymerized. In this case, an insulating member is provided on the rack 23 mounting surface on the lower surface of the transport sheet 21 so that the voltage is not transmitted to the rack 23.

As a fourth embodiment of the present invention, after the film 10 is cut by the heating roller 19 and the pressing roller 20 in the first embodiment (see FIG. 7), the film 10 is cut into a predetermined length. The solenoid 16 is energized until the winding of the platen roller 1 onto the platen roller is completed.
The pressing roller 12 is retracted from the thermal head 14 and the pressing means (not shown) is released, so that the pressing roller
20 retracts from heat roller 19. After that, the pinion 22 is rotated counterclockwise to move the transport sheet 21 leftward in the figure, and stopped at the home position. After this, the heating roller 19 is again energized to generate heat.
19 is heated, and at the same time, the pressing roller 20 is pressed against the conveying sheet 21 by pressing means (not shown),
The tip of 10 is welded to the conveying sheet 21. This allows
The film 10 and the transport sheet 21 can be reliably polymerized without using the adhesive 41. The material of the transport sheet 21 used in this embodiment is the thermal head 14
It is desirable to use a metal or heat resistant resin that does not deform when heated.

In each of the above-mentioned embodiments, since the conveying sheet 21 moves in a plane, it is necessary to take a large space for moving the conveying sheet 21. Therefore, as a fifth embodiment of the present invention, as shown in FIG. 16, a curved guide plate 43 for winding the upstream end portion of the transport sheet 42 in the film transport direction into a roll is provided, and the pinion 22 in the above embodiment is provided with the curved guide plate 43. Instead, the conveying sheet 42 is moved by the sheet roller pair 44 which is rotationally driven by a drive roller (not shown), and is guided by the guide plates 24 and 25, whereby the size of the apparatus can be reduced. The transport sheet
The movement timing of 42 is in accordance with each of the above embodiments, and the material is preferably a thin metal plate or a strong opaque flexible resin plate.

[0041]

According to the first aspect of the present invention, the sheet member conveys the master while overlapping with the master. Therefore, when the master is held by the locking means, the waviness and the flexure generated in the master are prevented. It is also possible to prevent wrinkles from being generated on the surface of the master during winding of the plate cylinder. Further, since the sheet member reciprocates between the locking means and the plate-making means, it is not necessary to provide a transportation roller or the like between the locking means and the plate-making means, and the distance between the locking means and the plate-making means is increased. Can be shortened, the apparatus can be downsized, and the time from the start of plate making to the end of plate making can be shortened.

According to the second aspect of the invention, during transportation,
Since the master does not come into contact with the thermal head and the heating member, the master does not come into contact with the obstacle during the transportation, so that the master can be transported without trouble.

According to the third aspect of the invention, by reliably polymerizing the master on the sheet member with the adhesive,
It is possible to prevent the master from floating from the sheet member during high-speed conveyance, and also to prevent the master from being rolled up by the conveyance rollers, etc., so that the master can be conveyed at high speed, and plate making can be completed from plate making to plate making. It is possible to shorten the time until.

According to the fourth aspect of the present invention, since the master is polymerized on the sheet member without using the adhesive, the master and the sheet member can be polymerized repeatedly without changing the adhesive. Therefore, the running cost can be reduced, the master can be conveyed at high speed, and the time from the start of plate making to the end of plate making can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic side view of a main part of a stencil printing apparatus adopting a first embodiment of the present invention.

FIG. 2 is a partial perspective view illustrating a part of a main part of a stencil printing apparatus that employs an embodiment of the present invention.

FIG. 3 is a side view illustrating the first embodiment of the present invention.

FIG. 4 is a side view illustrating the first embodiment of the present invention.

FIG. 5 is a side view illustrating the first embodiment of the present invention.

FIG. 6 is a side view illustrating the first embodiment of the present invention.

FIG. 7 is a side view illustrating the first embodiment of the present invention.

FIG. 8 is a side view illustrating the first embodiment of the present invention.

FIG. 9 is a schematic side view of a main part of a stencil printing apparatus that employs a second embodiment of the present invention.

FIG. 10 is a side view illustrating a second embodiment of the present invention.

FIG. 11 is a side view illustrating a second embodiment of the present invention.

FIG. 12 is a side view illustrating a second embodiment of the present invention.

FIG. 13 is a side view illustrating a second embodiment of the present invention.

FIG. 14 is a side view illustrating a second embodiment of the present invention.

FIG. 15 is a side view illustrating a second embodiment of the present invention.

FIG. 16 is a side view illustrating a fifth embodiment of the present invention.

[Explanation of symbols]

 1 plate cylinder 10 master (film) 12 platen roller 14 thermal head 19 heating member (heating roller) 20 pressing member (pressing roller) 21 sheet member (conveying sheet) 41 adhesive 50 locking means 60 plate making means 70 cutting means

Claims (4)

[Claims] 1. A locking means which is provided on the outer peripheral surface of a rotatable cylindrical plate cylinder and holds the tip of a master, and a thermal which selectively heats and punches the master according to image information. A platen roller which is provided so as to come in contact with and separate from the thermal head and conveys the master so as to be wound around the outer peripheral surface of the plate cylinder while pressing the thermal head, and constitutes a plate making means with the thermal head. And a stencil printing apparatus comprising cutting means for cutting the master into a predetermined length, having a sheet member reciprocating between the locking means and the plate making means, the sheet member comprising: A stencil printing machine, characterized in that the master is conveyed so as to engage with the locking means while being superposed on the front end of the master at the front end. 2. A stencil printing apparatus according to claim 1, wherein said cutting means comprises a heating member for cutting the master, and a pressing member which is provided so as to come in contact with and separate from said heating member and presses the master against said heating member. When the sheet member is reciprocating between the locking means and the plate making means while overlapping with the leading end portion of the master at the leading end portion thereof, the platen roller and the pressing member A stencil printing machine, wherein the thermal head and the heating member are respectively retracted. 3. The stencil printing apparatus according to claim 1, wherein the sheet member is provided at its tip end with an adhesive for polymerizing the sheet member and the master. 4. The heating member and the pressing member sandwich the master and the sheet member, and the tip portions of the master and the sheet member are fused by heating. Stencil printer.