JPH1148593A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printer in which a very thin and soft master having low rigidity, e.g. a synthetic fiber base master, is prevented from being wound around a print drum while creasing by eliminating a state where the air enters easily between the outer circumferential surface of the print drum and the master to be wound due to free behavior of the rear end part of the master. SOLUTION: When the rear end part of at least a processed master is wound through rotation of a print drum 2, the rear end part of the master 6 is matched along the outer circumferential surface of the print drum 2 by means of a master rear end matching member 13. The master rear end matching member 13 is arranged on the outer circumferential surface of the print drum 2 along the generator thereof such that it can touch the rear end part of the master. The master rear end matching member 13 has a pectinate shape comprising trench-like deaeration parts 14 and comb tooth parts 15 arranged over the noneffective image region 2C and the ink nonpermeable region 2D on the outer circumferential surface of the print drum 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a printing device such as a stencil printing device.

[0002]

2. Description of the Related Art A digital thermosensitive stencil printing apparatus has been well known as a simpler printing method. In this apparatus, a thermal head in which a plurality of fine heating elements are arranged in the main scanning direction is pressed against a platen roller via a heat-sensitive stencil master (hereinafter, simply referred to as a “master”), and the heating elements of the thermal head are pulsed. After the master is conveyed in the sub-scanning direction (hereinafter, sometimes referred to as the “master conveying direction”) orthogonal to the main scanning direction by the platen roller while generating heat, the plate is heated and melted and perforated based on the image information. The master made by the master conveying means such as a plate feeding roller pair is automatically supplied to the outer peripheral surface of the printing drum, and the leading end of the master made by the master conveying means is supplied to the porous cylindrical printing drum. After being locked to the outer peripheral surface, the master that has been made is automatically wound around the outer peripheral surface of the print drum by rotation of the print drum, and a press roller or the like is wound around the master. And it is adapted to form a printed image by printing paper pressure means pressing continuously to transfer the printing paper is passed through an ink from the perforated portion.

A master used in such a thermosensitive stencil printing machine is a very thin thermoplastic resin film such as polyester (hereinafter sometimes simply referred to as "film").
It has a laminate structure in which synthetic fibers, Japanese paper, or a mixture of Japanese paper and synthetic fibers are laminated as an ink-permeable porous support (hereinafter, referred to as “base”).

[0004]

However, in recent years,
In particular, in order to secure a good print image with high resolution, the thickness is very thin (about 10 to 30 μm) and thinner than the conventional master (the thickness is about 40 to 50 μm). Contains 100% of synthetic fibers or has a high mixing ratio of thin synthetic fibers to natural fibers (including yarns having a wire diameter of 6 μm or less, and a mixing ratio of synthetic fibers of 40 or less).
%) Attempt to use a master, that is, a synthetic fiber base master having a thickness that is very thin compared to a conventionally used master and that includes a thermoplastic resin film and an ink-permeable base containing at least synthetic fibers. Has been made. Such a synthetic fiber base master has a lower rigidity and a lower rigidity than a conventionally used master whose base is made of natural fibers (see the description based on FIGS. 4 and 5 described later). .

Therefore, for example, as shown in FIG. 18, a synthetic fiber base master 6 (hereinafter sometimes simply referred to as “master 6” and distinguished from “conventional master 6”) is used.
Consider a case in which the master 6 made by the plate making section 90 is automatically conveyed to the outer peripheral surface of the print drum 2 and the master 6 already made is automatically wound around the outer peripheral surface of the print drum 2 by rotation of the print drum 2. View. In the plate making section 90,
The master 6 is pressed against the platen roller 92 by the thermal head 91, and the heating element (not shown) of the thermal head 91 is pulsed to generate heat so that the master 6 is transported in the master transport direction Y by rotation of the platen roller 92. Thus, after the master 6 is perforated and made based on the image information,
Due to the rotation of the tension roller pairs 93a and 93b, the sheet is transported while being guided by the guide plate 96a in the master transport direction Y, and the tension roller pairs 93a and 93b and the reversing roller pairs 94a and
18 is forcibly formed on the stencil master 6 which is provided on the master conveyance path between the master roller 94b and the master stock means (not shown in FIG. 18). The rotation of 94b further transports the master 6 in the master transport direction Y, and changes the direction of the transported stencil master 6 downward by the reversing guide plate 96b. Then, in the printing drum unit 1, the leading end of the master 6, which has been made and conveyed from the pair of reversing rollers 94 a and 94 b, is locked on the outer peripheral surface of the printing drum 2 by the master clamper 11, and then the printing drum 2 is moved in the direction of arrow A. The master 6 that has been made is automatically wound around the outer peripheral surface of the printing drum 2 by rotation (clockwise).

[0008] At the end of winding by the rotation of the printing drum 2, the rear end of the prepressed master 6 has a small rigidity and a low waist and is soft, so that the solid line is shown in FIG. 18 and the virtual line is shown in FIG. As shown in FIGS. 19A and 19B, when the roller comes out of the nip portion of the pair of reversing rollers 94a and 94b and becomes free, as shown in FIG. 19A, on the outer peripheral surface of the supporting cylindrical body 3 constituting the printing drum 2. The rear end of the mesh screen 4 and the master screen 1
(1) In the vicinity of the razor portion 5 connected to the support cylinder 3 of the mounting portion, the ramming 6B occurs in a free state in the vicinity of the razor portion 5, and between the outer peripheral surface of the printing drum 2 and the master 6 which has been made and wound around it. The air enters the state. Preplated master 6
Is the mesh screen 4 in the printing drum 2
The reason why the warp 6B is easily generated near the rear end portion and the vicinity of the leather portion 5 is that when the roll-shaped master 6 stored for a long time in a high temperature state is used, in addition to the characteristic that the master 6 has a small rigidity and a low waist. Since the curl due to the curling becomes large, and the rear end of the master 6 having the prepress made in such a state in which the curl is large is free, the rear end of the master 6 which has been made is free to move and easily move. In this case, air is easily introduced between the outer peripheral surface of the printing drum 2 and the plate-making master 6 wound around the printing drum 2 for the following reason.

That is, as shown in FIG. 20, the outer peripheral surface of the printing drum 2 has an ink-ineffective non-effective image area 2C.
Area 2A including ink and effective image area 2B
(A portion corresponding to the support cylinder 3 having a large number of openings 3a having ink passage) and a leather portion 5 including an ink impervious region 2D that is impermeable to ink. There is a so-called ink trailing-edge leak region where several millimeters of band-like ink I is likely to accumulate along the generatrix direction on the mesh screen 4 at the boundary between the portion 2C and the leather portion 5, and the plate-making operation is free and free. 18 and FIGS. 19 (a) and 19 (b), the rear end of the master 6 adheres to the ink I accumulated in the tail leakage area of the ink.

[0008] Techniques for preventing such tail leakage of the ink are disclosed, for example, in Japanese Patent Publication No. 28670/1985, 4-8 of the Japanese Utility Model Application.
No. 7262 or Japanese Patent Application Laid-Open No. 8-150768, various methods have been proposed. However, even if these techniques completely prevent the trailing edge of the ink, the free movement of the rear end of the master 6 having been made into a plate causes a problem. It is not possible to completely eliminate the state in which air easily flows between the outer peripheral surface of the printing drum 2 and the master 6 that has been made and wound around it.

When the printing drum 2 completes the winding of the prepressed master 6, the printing drum 2 shifts to the next rotating operation for so-called "printing", and the rear end of the prepressed master 6 is air-knife. When passing through the fan 12, the air 12a blown by the air knife fan 12
As a result, when the printing paper 62 is fed and the printing is completed, the bending 6B is crushed by the pressing force of the press roller 103 via the printing paper 62 and becomes wrinkled 6C. The wrinkles 6C generated in this manner grow to reach the effective image area 2B on the mesh screen 4 in the generatrix direction and the rotation direction of the print drum 2, so that finally the print image quality is adversely affected. . Note that the air blowing operation of the air knife fan 12 needs to be performed before the rear end of the master 6 that has been made has passed through the air knife fan 12 in order to prevent the printing paper 62 from winding up on the printing drum 2. .

In FIG. 18, reference numeral 95 denotes a cutter for cutting the master 6, and in the same figure, the length of the rear end of the master 6 after plate making is exaggerated so that the state of the deflection 6B can be easily understood. It does not represent the actual length of one master plate 6 which has been drawn and has been made, and the positional relationship between the deflection 6B and the master clamper 11 is different from the actual one. In FIG. 20, reference numeral 37 denotes a counter roller, which will be described in detail later, and reference numerals 29a and 29b denote a pair of plate making side plates disposed on the front side and the back side of the master transport path, respectively. In FIG. 20, illustration of the mesh screen 4, the reversing guide plate 96b, and the like is omitted. Hereinafter, the master 6 that has been subjected to plate making may be appropriately indicated by a virtual line in order to simplify the drawing.

Accordingly, the present invention has been developed to solve the above-mentioned problems, when a master having a very small thickness, such as a synthetic fiber base master, and having a small rigidity and a low rigidity is wound around a printing drum. A printing device that eliminates the condition that makes it easy for air to enter between the outer peripheral surface of the printing drum and the master that is wound around the outer peripheral surface of the printing drum due to the free behavior of the rear end of the master, and prevents the winding from being caused by wrinkles The purpose is to provide.

[0012]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a printing drum on which an outer peripheral surface is wound with a master, and a printing plate arranged near the outer peripheral surface of the printing drum. Master conveying means for supplying the master to the outer peripheral surface of the printing drum, and locking the leading end of the master supplied from the master conveying means to the outer peripheral surface of the printing drum. In a printing apparatus in which the master is wound around the outer peripheral surface of the print drum by rotation, when at least the rear end of the master is wound by rotation of the print drum, the rear end of the master is moved along the outer peripheral surface of the print drum. It is characterized by having master rear end matching means for matching.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the master rear end aligning means is capable of contacting the rear end of the master and along the generatrix of the printing drum. It is a master rear end alignment member provided with an air vent portion provided on the outer peripheral surface of the printing drum.

According to a third aspect of the present invention, in the printing apparatus of the second aspect, the master rear end alignment member has a substantially comb shape in which the air vent portion is formed in a substantially groove shape. .

The invention according to claim 4 is the invention according to claim 2 or 3.
In the printing apparatus described above, the printing drum outer peripheral surface is provided with an ink-permeable region including an ink-impermeable non-effective image region and an ink-impermeable ink-impermeable region, and the master rear end. The alignment member is provided over the non-effective image area on the outer peripheral surface of the printing drum and the ink impermeable area.

According to a fifth aspect of the present invention, in the printing apparatus according to the first aspect, the master rear end aligning means is arranged so that the master transport means approaches the outer peripheral surface of the printing drum and the master conveying means moves along the outer peripheral surface of the printing drum. A master plate feeding unit configured to be displaceable between a guide position for guiding the rear end of the master plate supply unit and a separation position separated from the guide position, and moving the master plate supply unit between the guide position and the separation position. And a unit displacing means for displacing the unit.

According to a sixth aspect of the present invention, in the printing apparatus according to the first aspect, the master rear end aligning means is provided near the outer peripheral surface of the printing drum and moves closer to the outer peripheral surface of the printing drum. A master rear end holding member that can be displaced between a contact alignment position that contacts an end portion and aligns the rear end portion of the master and a separation position that is separated from the contact alignment position; It is characterized by comprising a pressing member displacing means for displacing between the contact alignment position and the separated position.

The invention according to claim 7 is the invention according to claims 1 to 6
Wherein the master is a synthetic fiber-based master comprising a thermoplastic resin film and an ink-permeable porous support containing at least synthetic fibers.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention including embodiments with reference to the drawings (hereinafter, simply referred to as "embodiments").
Will be described. For components and the like having the same function and shape over the conventional technology and each embodiment,
The description is omitted as much as possible by attaching the same reference numerals. Components that are configured as a pair and do not need to be specifically distinguished and described in the drawings will be replaced with the description by appropriately describing one of them for the sake of simplification of description.

First, the overall configuration of a stencil printing apparatus as an example of a printing apparatus to which the present embodiment is applied, the configuration around the printing drum unit 1, and the operation thereof will be described with reference to FIG.

In FIG. 17, reference numeral 50 denotes an apparatus body frame. A portion indicated by reference numeral 80 on the upper portion of the apparatus main body frame 50 constitutes a document reading unit, a portion indicated by reference numeral 90 below the plate reading unit, and a portion indicated by reference numeral 1 on the left side thereof is a porous cylindrical printing drum. A printing drum portion on which a printing plate 2 is arranged, and a portion indicated by reference numeral 70 on the left side thereof is a plate discharging portion and a plate making portion 9.
The part indicated by reference numeral 110 below 0 is the paper feeding unit, the part indicated by reference numeral 120 below the print drum 2 is the printing pressure unit, and the part indicated by reference numeral 130 at the lower left of the apparatus body frame 50 is the paper discharge unit. Is shown.

As shown in FIG. 17, an ink supply pipe 7 is driven by a main motor (not shown) as shown in FIG.
The printing drum 2 is rotated around a support shaft 7 which also serves as a printing drum. As the main motor, a DC motor which is a control motor is used. On the printing drum 2, a master clamper 11 for locking the leading end of the master 6 having been made is arranged along one bus line of the outer peripheral portion of the printing drum 2. The master clamper 11 is pivotally attached to the outer peripheral portion of the printing drum 2 with a clamper shaft 11a, and is capable of swinging and opening and closing.
The master clamper 11 has a rubber magnet, and when the printing drum 2 occupies the plate feeding position, the apparatus main body frame 5
The stage 11b made of a ferromagnetic material and provided on the outer periphery of the printing drum 2 by a well-known opening / closing means disposed on the 0 side.
Is opened and closed.

The operation of the stencil printing machine will be described below. First, a document 6 having an image to be printed is placed on a document table (not shown) arranged above the document reading unit 80.
0 is placed, and a plate making start key (not shown) is pressed. With the press of the plate making start key, a plate discharging process is first executed. That is, in this state, the printing drum unit 1
The used master 6 used in the previous printing remains mounted on the outer peripheral surface of the printing drum 2.

The rotation of a main motor (not shown) for rotating the printing drum 2 rotates the printing drum 2 in a counterclockwise direction, and the rear end of the used master 6 on the outer peripheral surface of the printing drum 2 discharges the plate. Plate discharge roller pair 71 in section 70
a, 71b, the pair of rollers 71a, 71b rotates and scoops up the rear end of the used master 6 with one of the plate discharging / separating rollers 71b.
The plate discharge box 74 is conveyed in the direction of arrow Y1 by plate discharge conveyance belt pairs 72a, 72b stretched between plate discharge roller pairs 73a, 73b and plate discharge peeling roller pairs 71a, 71b disposed to the left of 71b. And the used master 6 is peeled off from the outer peripheral surface of the printing drum 2 to complete the plate discharging process. At this time, the printing drum 2 continues to rotate counterclockwise. The used master 6 that has been peeled and discharged is thereafter compressed inside the plate discharge box 74 by the compression plate 75.

In parallel with the plate discharging process, the original reading section 80 reads the original. That is, the original 60 placed on the original placing table (not shown) is moved in the direction from the arrow Y2 to the arrow Y3 by the rotation of the separation roller 81, the front original transport roller pairs 82a and 82b, and the rear original transport roller pairs 83a and 83b. While being conveyed, it is subjected to exposure reading. At this time, if there are many originals 60, the separation blade 84
Only the lowermost document is conveyed. Manuscript 60
In the image reading of the image sensor, the reflected light from the surface of the document 60 illuminated by the fluorescent lamp 86 is reflected by the mirror 87 while being conveyed on the contact glass 85, passes through the lens 88, and passes through the lens 88. 89. The original 60 from which the image has been read is discharged onto the original tray 80A. The electric signal photoelectrically converted by the image sensor 89 is converted into an analog / digital (A /
D) It is input to a conversion board and converted into a digital image signal.

On the other hand, in parallel with this image reading operation,
A plate making and plate feeding process is performed based on the digital signalized image information. In the prepress process, a prepress master mode, which will be described later, executes a prepress mode in which a prepress is forcibly formed on the prepressed master 6. The master 6 is set at a predetermined portion of the plate making section 90 so as to be able to be fed out, pulled out from a master roll 6A formed by being wound around a core tube 6a in a roll shape, and passed to the thermal head 91 via the master 6 via the master 6. Platen roller 92 and a pair of tension rollers 93a, 93
Due to the rotation of b, it is transported downstream in the master transport direction Y. A plurality of minute heating elements (not shown) arranged in a line in the main scanning direction of the thermal head 91 are sent from the A / D conversion board to the master 6 conveyed in this manner. Heat is selectively generated in accordance with the digital image signal, and the thermoplastic resin film of the master 6 that is in contact with the heat generating element is melt-punched. As described above, the image information is written as a punching pattern by the position-selective fusion punching of the master 6 according to the image information.

The platen roller 92 is connected to a master transport motor (not shown) composed of a stepping motor, and is rotated by the master transport motor. The rotational driving force of the master transport motor is transmitted to a tension roller 93a, which is a driving side of the pair of tension rollers 93a and 93b, via a rotation transmitting member such as a gear. Furthermore, the rotational driving force of the master transport motor is:
Rotation transmitting member such as gear and electromagnetic clutch (not shown)
Is transmitted to a pair of reversing rollers 94a and 94b as master transport means in contact with each other and provided on the downstream side in the master transport direction Y near the outer peripheral surface of the print drum 2. The upper reversing roller 94a is a driving roller, and the lower reversing roller lower 94b is a reversing roller 94.
Each of the driven rollers is configured to be rotated with a, and an appropriate pressing force is applied by urging means such as a spring (not shown).

In this way, the platen roller 92 and the pair of tension rollers 93a and 93b are rotated by the rotation of the master transport motor, and the reversing roller 94a is rotated by turning on the electromagnetic clutch. It is transported downstream in the transport direction Y. At this time, it is not shown that the leading end of the stencil master 6 is guided by the guide plate 96a, is conveyed to the pair of reversing rollers 94a and 94b, and is nipped by the pair of reversing rollers 94a and 94b due to the number of steps of the master conveying motor. When the determination is made by the control device, the rotation of the reversing roller 94a is stopped by turning off the electromagnetic clutch according to a command from the control device, and the pair of reversing rollers 94a, 94b
Rotation stops.

The unprinted portion of the stencil master 6 having its leading end sandwiched between the pair of reversing rollers 94a and 94b is subsequently subjected to perforating stencil making by the thermal head 91. The plate-making master 6 having its leading end sandwiched between the pair of reversing rollers 94a and 94b has its subsequent portion placed on the platen roller 92.
By being conveyed by the tension roller pairs 93a and 93b, the intermediate portion thereof is bent upward in an inverted U shape from above the guide plate 96a, and is conveyed from the opening of the deflecting box 97 into the deflecting box 97. At this time,
The suction fan 98 rotates in response to a command from the control device, causing the air inside the deflecting box 97 to flow from the inside to the outside.
Is introduced into the inside of the deflecting box 97 so as to go around the front end of the deflecting box 97, and is stored inside the deflecting box 97.

When the plate discharging process, which has been proceeding in parallel with the plate making process, is completed and the printing drum 2 stops at the plate feeding position shown in FIG. 17, the plate feeding process is started immediately. At this time,
In the thermal head 91, the plate making operation for the master 6 continues. Then, when the deflection detection sensor 99 including the light reflection type photo sensor is turned on,
When it is confirmed by the master 6 that has been made that a predetermined amount of deflection has been formed inside the deflection box 97,
The reversing roller pair 94a, 94b stopped by a command from the control device starts to rotate again, and the master 6 after the plate making is changed its traveling direction downward by the reversing guide plate 96b, and is in the plate feeding position state. The print drum 2 hangs down toward the expanded master clamper 11 (indicated by a virtual line). At this time, the used master 6 has already been removed from the printing drum 2 by the plate discharging process. Then, the leading end of the master 6 having been made is conveyed to the master clamper 11, and the leading end is locked on the outer peripheral surface of the printing drum 2 by closing the master clamper 11 at a predetermined timing.
After the master clamper 11 is closed, the electromagnetic clutch is turned off by a command from the control device.

Next, when the electromagnetic clutch is turned off by a command from the controller, the main motor is driven to rotate again, so that the printing drum 2 rotates in the direction A (clockwise) in FIG. Is gradually wound around the master 6. This printing drum 2
Is carried out while the electromagnetic clutch is turned off, that is, the pair of reversing rollers 94a and 94b are rotated and driven by the tension of the master 6 having been made by the rotation of the print drum 2 and the reverse rollers 94a and 94b. At this time,
The suction fan 98 is operating, and the master 6 after the plate making in the deflecting box 97 is continuously applied with an appropriate tension, so that the occurrence of jam is suppressed.
The master winding operation by the printing drum 2 progresses, and the plate-making master 6 stored in the deflection box 97 is completed.
Is transported to the printing drum 2 and the deflection detection sensor 99 is turned off, the rotation of the printing drum 2 and the pair of reversing rollers 94a and 94b is temporarily stopped by a command from the control device. During this time, the master 6
And the platen roller 92 and the pair of tension rollers 93a and 93b are rotating, so that the master 6 having been made on the guide plate 96a is again conveyed to the inside of the deflection box 97. Then, the deflection detection sensor 99 is turned on. When the deflection detection sensor 99 is turned on, the print drum 2 and the reversing roller pair 94 which have been stopped are stopped by a command from the control device.
The a and 94b rotate again, and the master 6 after plate making stored in the deflection box 97 is wound around the outer peripheral surface of the printing drum 2. Thus, the on / off of the deflection detection sensor 99
Along with the OFF operation, the printing drum 2 and the pair of reversing rollers 94a and 94b rotate intermittently in response to a command from the control device, and the plate feeding operation of the master 6 having finished making the plate on the outer peripheral surface of the printing drum 2 is started. proceed.

From the number of steps of the master transport motor,
When the control device determines that the master 6 for which one plate has been made has been made, the operation of the platen roller 92 and the tension roller pair 93a, 93b is stopped by a command from the control device. When the control device determines that the master 6 having been made and stored in the deflection box 97 has been transported to the printing drum 2 from the number of steps of the master transport motor, the control device determines , The rotation of the pair of reversing rollers 94a and 94b, the printing drum 2 and the suction fan 98 is stopped, and the rotary blade, which is the movable blade of the cutter 95, is moved to set the rear end of the master 6 on which the plate has been made. Cut to length. Thereafter, in response to a command from the control device, the reversing roller pairs 94a and 94b and the printing drum 2 are operated again, and the printing drum 2 is rotated in the direction A in FIG. Then, the plate feeding process is completed.

As described before and after, the master stock means is mainly composed of a deflecting box 97, a suction fan 98, a deflecting detection sensor 99 and a suction fan drive motor (not shown) for rotating the suction fan 98. The master stock means has a well-known function of forming a deflection in the perforated master 6 and making a temporary storage of the deflection.

Next, a printing process is started. First, the uppermost one of the printing papers 62 loaded on the paper feed table 51 is selected.
The sheet is fed by the feed roller 111 and the separation roller pair 112a, 11
The printing paper 2 is fed by the pair of registration rollers 113a and 113b in the direction of arrow Y4, and further sent to the printing pressure unit 120 by the registration rollers 113a and 113b at a predetermined timing synchronized with the rotation of the printing drum 2. The sent printing paper 62 is printed by the printing drum 2 and the press roller 1.
03, the press roller 103, which has been separated below the outer peripheral surface of the print drum 2, is moved upward, and is pressed against the plate-making master 6 wound around the outer peripheral surface of the print drum 2. Is done. In this way, the ink oozes out from the porous portion of the printing drum 2 and the perforated pattern portion of the master 6 having been made, and the oozed ink is transferred to the surface of the printing paper 62 to form a print image.

At this time, on the inner peripheral side of the printing drum 2, ink is supplied from an ink supply pipe 7 to an ink reservoir 10 formed between the ink roller 8 and the doctor roller 9,
The ink is supplied to the inner peripheral side of the print drum 2 by the ink roller 8 which rotates in the same direction as the rotational direction of the print drum 2 and in synchronization with the rotational speed of the print drum 2 while rolling on the inner peripheral surface. .

The printing paper 62 on which the print image has been formed in the printing pressure unit 120 is peeled off from the printing drum 2 by the blowing air from the air knife fan 12 in the paper discharging unit 130, and is suctioned and discharged while being suctioned by the suction fan 118. Due to the counterclockwise rotation of the transport belt 117 wrapped around the paper inlet roller 115 and the suction paper outlet roller 116, the paper is conveyed toward the paper discharge unit 130 as indicated by an arrow Y5, and is sequentially placed on the paper discharge table 52. Discharged and loaded. Thus, the so-called trial printing is completed. Note that, depending on the model, a paper discharge peeling claw (not shown) may be used instead of the air knife fan 12, or both of them may be provided with these paper discharge peeling means.

Next, when the number of prints is set using a numeric keypad (not shown) and the print start key (not shown) is pressed, the steps of paper feeding, printing, and paper discharging are set in the same steps as in the test printing. This process is repeated for the number of prints, and the entire stencil printing process is completed.

(Embodiment 1) A first embodiment (hereinafter, simply referred to as "Embodiment 1") will be described with reference to FIGS. In the first embodiment, as shown in FIGS. 1 to 3, at least the rear end of the stencil-completed master 6 is attached to the printing drum 1 of the conventional stencil printing apparatus shown in FIG. At the time of winding, the air release section 14 as a master rear end aligning means for aligning the rear end of the plate-making master 6 along the outer peripheral surface of the printing drum 2.
Is provided at a specific portion on the outer peripheral surface of the printing drum 2 and the above-mentioned synthetic fiber base master 6 can be used.

The master rear end aligning member 13 is used to
Is provided on the outer peripheral surface of the printing drum 2 along the generatrix of the printing drum 2 so as to be able to contact the rear end of the master 6 having been made and wound around the outer peripheral surface of the printing drum 2 by the rotation of. A plurality of air vents 14 formed in a groove shape
And a plurality of comb teeth portions 15. The master rear end alignment member 13 is disposed such that the groove-shaped opening side of the air vent portion 14 faces the downstream side of the print drum 2 in the direction of arrow A, and the air vent portion 14 is located on the outer peripheral surface of the print drum 2. The non-effective image area 2C and the ink impermeable area 2D are provided. As shown in FIG. 2, the plurality of air vents 14 of the master rear end aligning member 13 are formed by the free movement of the rear end of the master 6 on which printing has been performed. And serves as a gap for removing air air entering between the master 6 and the air master. The master rear end aligning member 13 reduces the portion stuck to the ink accumulated in the above-mentioned ink trailing edge leaking area, and reduces the ineffective image area 2
It also contributes to the prevention of the trailing edge of the ink existing in the band-like area of several mm along the generatrix direction on the mesh screen 4 at the boundary between the C and the leather portion 5 for the reason described later.

The master rear end alignment member 13 is, for example, integrally formed of a synthetic resin such as acrylonitonyl butadiene styrene resin (ABS), polycarbonate (PC) or the like, as shown in FIG. , Printing drum 2
The thickness of one end side fixed to the leather portion 5 side is, for example, 1 to
A substantially comb-shaped sheet member is formed in a range of 3 mm, and its thickness gradually decreases toward the other end. The master rear end alignment member 13 has, for example, a back surface on one end side adhered to the leather portion 5 side with a double-sided adhesive tape or an adhesive.
Fixed.

Air release section 1 of master rear end alignment member 13
4 and the shape, size and arrangement of the comb teeth 15
Rotation speed of the print drum 2 when the master is wound, the print drum 2
In consideration of the shape and dimensions of the synthetic fiber base master 6 and / or the detailed specifications of the synthetic fiber base master 6 to be used, the details are omitted because they belong to items that can be appropriately designed based on data such as experiments.

As shown in FIG. 4, the master 6 is made of, for example, polyethylene terephthalate (PE).
T) Base 6 containing 100% thin synthetic fibers
2 (porous support) and a polyethylene terephthalate (PET) -based thermoplastic resin film 6-1 having a thickness t1 of 1.5 μm and a thickness t2 of 25 to 30 μm
m synthetic fiber base master 6 is used. Base 6
2, the diameter of the polyethylene terephthalate yarn is
The base 6-2 is formed so that thin polyethylene terephthalate-based yarns are woven in the vertical and horizontal directions exactly, using a material having a range of 4 to 6 μm and having a uniform thickness. .

Here, regarding the conventional master 6 and the synthetic fiber base master 6, the bending stiffness (also referred to as stiffness) as a representative characteristic is measured by an L & W stiffness tester (Lorentz).
en & Wettre). The L & W stiffness tester constitutes a test device as schematically shown in FIGS. 5A and 5B. The procedure for measuring the stiffness of the master 6 in the L & W stiffness tester will be schematically described. As shown in
The longitudinal direction of the master 6 as a rectangular (50 mm × 32 mm) test piece 48 is made horizontal, one end of the master 6 is clamped by a clamp device 45, and the other end of the master 6 is attached to the knife edge 46 by the film of the master 6. Set the surface side. Then, the clamp device 45 is rotated by 30 ° around the pivot axis 44 which is a vertical rotation axis, and the test piece 4 at that time is rotated.
8 (master 6) is received by the knife edge 46 by bending and converted and measured by a transducer 47 having a screw for adjusting the position of the knife edge 46.

The measurement was carried out under the following conditions. Test piece = 50 mm × 32 mm Measurement span = 1 mm Bending angle = 30 ° Bending speed = Measurement time: 5 ° / sec In FIG. 5 (a), the measurement span = 1 mm is longer than the actual one to make the figure easier to see. It is exaggerated in size. The results obtained by measuring the vertical stiffness and the horizontal stiffness of the conventional master 6 and the synthetic fiber base master 6 with the above-described L & W stiffness tester and comparing the results are as follows. Note that the classification of the vertical stiffness and the horizontal stiffness will be described.
In a state where the above test piece is set in parallel to the master transport direction Y, the bending rigidity in the master transport direction Y is referred to as vertical rigidity, and the bending rigidity in the master width direction X is referred to as horizontal rigidity. The specifications of the conventional master 6 include a base containing 60% hemp and polyethylene terephthalate (PET).
The thickness of the system was measured by using a laminate of a thermoplastic resin film having a thickness of 1.5 μm and a thickness of 43 to 47 μm.

Conventional master 6: about 128/70
mN (vertical / horizontal, unit: millinewton) Synthetic fiber base master 6 ... about 35/22 mN (vertical /
Next, the operation of the first embodiment will be described focusing on differences from the operation of the stencil printing apparatus shown in FIG. In the plate feeding step, the rear end of the stencil master 6 at the end of the winding by the rotation of the printing drum 2 is free as described above, and has a lower rigidity and less rigidity than the conventional stencil 6. As shown by the solid line in FIG. 2, as shown by the solid line in FIG.
Air air enters between the outer peripheral surface of the printing drum 2 and the master 6 that has been made and wound around the printing drum 2. At this time, the plurality of comb teeth portions 1 of the master rear end alignment member 13 are formed.
5 prevents the ink from adhering due to the trailing edge of the ink, and air air that has entered between the outer peripheral surface of the printing drum 2 and the plate-making master 6 wound around the printing drum 2 forms a master rear end alignment member. By the action of the plurality of air vents 13, the air is vented from the air vents 14 in the direction indicated by the arrow in the figure while being ordered, and the deflection 6B is extremely small.

At the time of printing in such a state, when the rear end of the master 6 that has been made passes through the air knife fan 12, the air 1
Even if it works so as to enlarge the deflection 6B in 2a, the growth of the deflection 6B is suppressed by the action in the master width direction X of the plurality of air vent portions 14 of the master trailing end alignment member 13 similar to the above described. . Then, by the pressing operation of the press roller via the printing paper 62 and the pre-made master 6, air air entering between the outer peripheral surface of the printing drum 2 and the pre-made master 6 wound around the printing drum 2.
Finally, the plurality of air vents 14 of the master rear end alignment member 13 are neatly pulled out from the air vents 14 in the direction indicated by the arrow in the figure while the flow is being ordered, so that the plate making is completed. The base surface of the rear end portion of the master 6 comes into contact with the upper surface of the plurality of comb teeth portions 15 of the master rear end alignment member 13 without adhering to the ink.

In this way, the rear end of the stencil master 6 at the end of winding at the time of stencil printing is stored for a long time in a high temperature state by the above-described operation of the master rear end alignment member 13, and the curl due to the curl is large. The resulting synthetic fiber base master 6 can be wound neatly without being wrinkled or bent while being aligned along the outer peripheral surface of the printing drum 2.

The pressing operation of the press roller 103 at the time of finishing the winding of the rear end portion of the master 6 having finished making the plate will be described with reference to FIG. 17. When the other end side of the master rear end alignment member 13 is pressed by the press roller 103, the plurality of comb teeth portions 15 are elastically bent and deformed by being provided at a specific portion on the outer peripheral surface of the printing drum 2. As a result, the volume of the air vent 14 is reduced as compared to before the pressing. For this reason, the ink accumulated in the air vent 14 is returned to the inside of the print drum 2 from the opening of the print drum 2, and the ink accumulated in the air vent 14 leaks onto the master rear end alignment member 13. Disappears. The master rear end alignment member 13 is made of the above-mentioned synthetic resin or the like having a shape restoring property, and is restored to the original shape when the press roller 103 is separated from the outer peripheral surface of the printing drum 2. You will be back. Therefore, the air bleeding part 14 of the master rear end alignment member 13 is formed of a band-shaped area of several mm along the generatrix direction on the mesh screen 4 at the boundary between the non-effective image area 2C and the leather part 5. It can be said that it has also contributed to the prevention of buttocks leakage to some extent.

Air bleeding part 1 of master rear end alignment member 13
The shape of No. 4 is not limited to this, and may be, for example, a triangular shape or a through-hole shape having an air venting structure (specifically, for example, a cover member from the structure shown in FIG. 1 of JP-A-8-150768). 32 or the protrusion 55 of the structure shown in FIGS.
Is formed as a through hole and the covering member 58 is removed).

The material of the air vent portion 14 is formed of the above-mentioned synthetic resin for ease of production and low cost. However, the material is not limited to this, and any material having ink resistance and having a certain shape resilience can be used. Anything may be used, for example, a spring steel material or the like.

(Embodiment 2) A second embodiment (hereinafter, simply referred to as "Embodiment 2") will be described with reference to FIGS. In the second embodiment, when the printing drum 2 is rotated to wind at least the rear end of the stencil master 6, the rear end of the stencil master 6 is aligned along the outer peripheral surface of the printing drum 2. The third embodiment is characterized in that a master rear end aligning means 17 different from that of the first embodiment is provided. The master rear end aligning means 17 guides the rear end of the master 6 on which the plate has been made along which the pair of reversing rollers 94a and 94b as master conveying means approaches the outer peripheral surface of the printing drum 2 along the outer peripheral surface of the printing drum 2. 8 and a master plate feeding unit 30 (FIG. 8) configured to be displaceable between a guide position shown in FIG.
And a unit displacement means 55 (shown in FIGS. 8 to 10) for displacing the master plate feeding unit 30 between the guide position and the separated position.

The guide position is a position where the master plate supply unit 30 is closest to the outer peripheral surface of the printing drum 2 so as not to interfere with the outer peripheral surface of the printing drum 2. Preparing master 6 while guiding
Refers to a position where the rear end of the print drum 2 can be wound around the outer peripheral surface of the print drum 2 without wrinkling or bending. The separated position refers to a position that is separated outward from the outer peripheral surface of the printing drum 2 to such an extent that the master plate supply unit 30 does not interfere with the protruding portions such as the master clamper 11 and the razor portion 5 provided on the printing drum 2.

As shown in FIG. 8, the master plate supplying unit 30 includes a pair of reversing rollers 94a and 94b, two plate supplying pulleys 32, a reversing roller pulley 33, an electromagnetic clutch 34, a reversing roller gear 35, a belt 33A, an idle counter gear. 36, counter roller 37, counter gear 38,
It is mainly composed of a connecting member 40, a pair of unit side plates 42a and 42b, and a support shaft 41.

The configuration around the master roll 6A and around the master transport mechanism 18 for transporting the thermal head 91 and the master 6, together with the above configuration of the master plate supply unit 30, will be described. As shown in FIG. 6, the master roll 6A is not shown in FIG. 6, and is provided on both sides of the master roll supporting member 6b provided on the pair of plate making side plates 29a and 29b shown in FIGS. Core tube 6
By attaching and detaching a, it becomes detachable.

As shown in FIGS. 8 to 10, the plate making side plate pairs 29a and 29b are provided with tension roller pairs 93a and 93b.
b extends to the downstream side in the master transport direction Y up to a position where it rotatably supports b. An L-shaped bent portion 29c is provided at an upper portion of the downstream end, and an L-shaped portion is provided at a lower portion of the downstream end. Each of the stopper portions 29d is formed to be bent. In the vicinity of each shaft support of the pair of tension rollers 93a, 93b of the pair of plate making side plates 29a, 29b, spring locking portions 29e are cut and bent.

The thermal head 91 has a platen roller 9
The platen roller 92 extends parallel to the second shaft 92a, and can be freely moved toward and away from the platen roller 92 via the master 6 by a contacting / separating means having a spring, a cam, and the like, not shown.

As shown in FIGS. 6 and 8, the master transport mechanism 18 includes a master transport motor 19 and a motor pulley 2.
2, timing belt 23, drive pulley 24, drive gear 25, platen roller 92, platen roller gear 26,
Idle gear 27, tension roller gear 28, tension roller pair 93a, 93b, tension roller pulley 28A, belt 31, two plate feeding pulleys 32, reversing roller pulley 33, belt 33A, electromagnetic clutch 34, reversing roller pairs 94a, 94b, It mainly comprises a reversing roller gear 35, an idle counter gear 36, a counter gear 38 and a counter roller 37.

As shown in FIG. 6, the platen roller 92 is formed integrally with a platen roller shaft 92a.
By being rotatably supported by a and 29b, it is rotatable clockwise as indicated by the arrow in the figure. The platen roller gear 26 is fixedly provided at the end of the platen roller shaft 92a on the front side of the platen roller 92.

A master transport motor 19 having a toothed motor pulley 22 fixed to an output shaft (not shown) is fixed to the plate making side plate 29a on the front side near the platen roller 92. A toothed drive pulley 24 is disposed near the platen roller 92, and the drive pulley 24 is attached to the plate making side plate 29 on the front side.
a and is integrally attached to a shaft 24a rotatably supported by the shaft 24a. A timing belt 23 is stretched between the motor pulley 22 and the drive pulley 24. on the other hand,
Between the master transport motor 19 and the platen roller 92, a drive gear 25 fixed to the drive pulley 24 and coaxially 24a and meshing with the platen roller gear 26 is provided.

As shown in FIGS. 6 and 8, the upper tension roller 93a is made of foamed polyurethane rubber or silicone rubber, and constitutes a drive roller formed integrally with the shaft. The tension roller 93a is
Since both ends of the shaft are rotatably supported by the pair of plate making side plates 29a and 29b, the shaft is rotatable clockwise as indicated by the arrow in the figure. Lower tension roller 93
b denotes a driven roller which is a metal roller. The tension roller 93b is configured such that both ends of the shaft have the plate making side plate pair 29.
By being rotatably supported by a and 29b, it is rotatable in a counterclockwise direction in the figure. The tension roller pairs 93a and 93b are provided with an appropriate pressing force by a biasing means such as a spring and pressed against the tension roller, and apply tension to the master 6 located on the downstream side of the platen roller 92 in the master transport direction Y. Has functions. A tension roller gear 28 is provided at the front end of the shaft of the tension roller 93a.
And a tension roller pulley 28A are fixedly provided.

Platen roller 92 and tension roller 9
As shown in FIGS. 6 and 8, a shaft 27a rotatably supported by a plate making side plate 29a on the front side is integrally mounted between the shaft 3a and the platen roller gear 26 and the tension roller gear 28. The idle gear 27 is provided rotatably in a counterclockwise direction in the figure.

As shown in FIGS. 8 to 10, the unit side plate pairs 42a and 42b are provided separately from the plate making side plate pairs 29a and 29b on the near side and the back side of the master transport path. . The unit side plate pairs 42a and 42b are substantially integrally connected to a support shaft 41 that is loosely fitted and penetrated at the downstream end in the master transport direction Y of the plate making side plate pairs 29a and 29b. It is swingable with 41. In other words, both end portions of the support shaft 41 pass through the downstream end portions of the pair of plate making side plates 29a and 29b in the master transport direction Y, and are supported by the plate making side plate pairs 29a and 29b so as to be rotatable by a predetermined angle. Both ends of the support shaft 41 are fixed to the pair of unit side plates 42a and 42b. An L-shaped bent portion 42c is formed at the upper end of the unit side plate pair 42a, 42b on the upstream side in the master transport direction Y, and a stopper portion 42d is formed at the lower end of the downstream side. An L-shaped spring locking portion 42e is formed below each locked portion 42c of the pair of unit side plates 42a and 42b. The upper portion of the pair of unit side plates 42a, 42b is connected by a connecting member 40 to reinforce the master plate supply unit 30.

At the lower part of the unit side plate 42a on the front side, 2
A series of plate feed pulleys 32 are rotatably provided. A toothed belt 31 is stretched between the tension roller pulley 28A and the near side of the two plate feed pulleys 32.

At the front end of the shaft of the reversing roller 94a,
A reversing roller gear 35 and a reversing roller pulley 33 are fixedly mounted, respectively.
4 are provided. Between the back side of the two plate feeding pulleys 32 and the reversing roller pulley 33, a toothed belt 33A is provided.
Has been passed over.

The electromagnetic clutch 34 is interposed between the shaft of the reversing roller 94a and the reversing roller pulley 33, and connects or disconnects the rotational driving force transmitted from the master transport motor 19 to the reversing roller 94a. Has functions.

The counter roller 37 is shown in FIGS.
As shown in FIG. 0, it is composed of a plurality of skewered rollers made of metal arranged to bite into the reversing roller 94a. The counter roller 37 is mounted integrally with a shaft rotatably supported by the pair of plate-making side plates 29a and 29b, and is arranged in the same direction as the rotation direction (clockwise in the drawing) of the reversing roller 94a and at the same time as the peripheral speed. The gear ratio of a gear train described later is set so that the gear train is also rotated at a high peripheral speed. The counter roller 37 is held between the nip portions of the pair of reversing rollers 94a and 94b in a low humidity state or the like.
The master 6 that has been prepressed and conveyed by the rotational drive of a
However, it has a well-known function of preventing the reversing roller 94a from electrostatically attracting and winding up.

At the front end of the counter roller 37,
A counter gear 38 is fixed. Reversing roller 94
The idle counter gear 36, whose shaft is rotatably supported by the unit side plate 42a on the front side and meshes with the reversing roller gear 35 and the counter gear 38, is provided between the counter roller 37 and the counter roller 37.

The master plate feeding unit 30 is always positioned between the spring locking portions 29e of the plate making side plate pairs 29a and 29b and the spring locking portions 42e of the unit side plate pairs 42a and 42b so as to always occupy the separated position. The springs 59 (tensile springs) that are energized are respectively stretched.

As shown in FIGS. 8 to 10, the pair of reversing rollers 94a and 94b are provided on the downstream side in the master transport direction Y near the outer peripheral surface of the printing drum 2, and are in contact with each other, and are not shown. An appropriate pressing force is applied by a biasing means such as a spring.

The upper reversing roller 94a is made of foamed polyurethane rubber, and constitutes a driving roller integrally formed with its shaft. The reversing roller 94a is rotatable in a clockwise direction indicated by an arrow in the drawing because both ends of the shaft are rotatably supported by the pair of unit side plates 42a and 42b.

The lower reversing roller 94b is a metal roller and is configured as a driven roller that rotates together with the reversing roller 94a. The reversing roller 94b is shown in FIGS.
As shown in FIG.
In the state where the master 6 having the plate-making finished is stretched between the master 6a and 94b, the master 6 is arranged to receive the back tension of the master 6 having the plate-making finished.

As described above, the rotational driving force of the master transport motor 19 is controlled by the motor pulley 22 and the timing belt 2.
3, while being sequentially transmitted to the drive pulley 24, the drive gear 25, the platen roller gear 26, and the platen roller 92, the idle gear 27, the tension roller gear 28, the pair of tension rollers 93a and 93b, the tension roller pulley 28A, the belt 31, A double plate feed pulley 32, a belt 33A, a reversing roller pulley 33, an electromagnetic clutch 34,
It is sequentially transmitted to the pair of reversing rollers 94a and 94b, the reversing roller gear 35, the idle counter gear 36, the counter gear 38 and the counter roller 37.

FIG. 8 to FIG.
0, the support shaft 41 and the bracket 5
6, a solenoid 57 fixed to a stationary member (not shown) fixed between the unit side plate pair 42a, 42b,
The lower end is connected to the plunger 57a of the solenoid 57 via a pin 57b so as to be rotatable by a predetermined angle, and the upper end is mainly penetrated by the support shaft 41 and fixed to the support shaft 41 by screws 58. It is configured.

Next, the operation of the second embodiment will be described with reference to FIGS. 11 to 14, focusing on differences from the operation of the stencil printing machine shown in FIG. The plate discharging process which has been proceeding in parallel with the plate making process is completed, and the printing drum 2 is moved to the position shown in FIGS.
When the plate is stopped at the plate feeding position shown in FIG. 1, the plate feeding process is started immediately. At this time, the plate making operation for the master 6 is continued in the thermal head 91 (see FIG. 7), and the master plate feeding unit 30 occupies the separated position. Then, the master 6 after the plate making forms a predetermined amount of deflection and is stored in the deflection box 97, and when the deflection detection sensor 99 is turned on, a command signal is transmitted to the electromagnetic clutch 34 from a control device (not shown). As a result, the stopped reversing roller pair 94a, 94b starts to rotate again, and the stencil master 6 completes the reversing guide plate 96.
The traveling direction is changed downward by b, and the print drum 2 hangs down toward the expanded master clamper 11 in the plate feeding position state. At this time, the used master 6 has already been removed from the printing drum 2 by the plate discharging process. And
The rotation of the pair of reversing rollers 94a and 94b causes the master transport motor 19 to rotate when the master 6 having a predetermined length of plate-making is sent.
When the master clamper 11 is closed, the leading end of the stencil master 6 is locked on the outer peripheral surface of the printing drum 2. After the master clamper 11 is closed, the electromagnetic clutch 34 is turned off by a command from the control device.

Next, at the same time as the electromagnetic clutch 34 is turned off by a command from the control device, the main motor is driven to rotate again, so that the print drum 2 is moved in the direction A (clockwise direction) as shown in FIG. ), The stencil master 6 is gradually wound around the outer peripheral surface while rotating. When the master is wound by the printing drum 2, the electromagnetic clutch 34 is in the off state, so that the pair of reversing rollers 94a and 94b are rotated and driven to rotate by the tension of the stencil master 6 due to the rotation of the printing drum 2. It is done while. In addition, at this time, the suction fan 98 is operating, and a suitable tension is continuously applied to the stencil master 6 inside the deflection box 97, so that the occurrence of jam is suppressed.

The master winding operation by the rotation of the printing drum 2 proceeds, and the master clamper 11 on the outer peripheral surface of the printing drum 2
However, when the print drum 2 is rotated to a position where it does not interfere with the master plate feeding unit 30 when it occupies the guide position,
The solenoid 57 of the unit displacement means 55 is turned on by a command from the control device. As a result, as shown in FIG. 10, the plunger 57a of the solenoid 57 is sucked in the right direction of the arrow in the drawing against the urging force of the spring 59, and the pair of unit side plates integrally forming the master plate feeding unit 30 is formed. 42
a, 42b, the support shaft 41 and the bracket 56 are shown in FIG.
As shown in the figure, the unit 41 swings about the support shaft 41 in the direction of the arrow (counterclockwise) in the figure, and
a, 42b are the plate making side plate pairs 29.
By engaging with each stopper part 29d of a and 29b,
The master plate feeding unit 30 occupies the guide position and is held at this guide position. The holding state of the master plate feeding unit 30 at the guide position is continued at least until the plate feeding operation state (immediately before finishing the winding of the rear end of the plate-making master 6) shown in FIG.

In the state where the master plate feeding unit 30 occupies the guide position, the reversing roller 94b of the master 6 having been made plate.
The distance L2 shown in FIG. 10 from the contact portion of the master 6 to the winding contact portion of the stencil master 6 around the outer peripheral surface of the printing drum 2.
(Corresponding to the length of the free end of the rear end of the master 6 having been made) is shorter than the same distance L1 (L1> L2) by the conventional stencil printing apparatus shown in FIG. Is the distance D2 in the radial direction between the outer peripheral surface of the printing drum 2 and the reversing roller 94b in the state where the guide position is occupied (air enters between the outer peripheral surface of the printing drum 2 and the stencil master 6 wound therearound). Is shorter than the same distance D1 (D1> D2) by the conventional stencil printing apparatus shown in FIG.

When the solenoid 57 is turned on and the master plate feeding unit 30 is displaced to the guiding position, the master plate 6 is finished in a stretched state in which the slack of the master plate 6 is extended by L1-L2. In order to wind the master 6 around the outer peripheral surface of the print drum 2, it is desirable to control the main motor so as to increase the rotational peripheral speed of the print drum 2.

When the plate-making master 6 stored in the deflection box 97 is conveyed to the printing drum 2 and the deflection detection sensor 99 is turned off, the printing drum 2 and the pair of reversing rollers 94a, 94a, 94b
The rotation of is paused. During this time, the thermal head 9
1, the plate making for the master 6 is continuously performed, and the platen roller 92 and the tension roller pair 93 are provided.
Since the plates a and 93b are rotating, the plate-making master 6 conveyed on the guide plate 96a again receives the deflectable box 97.
And turns on the deflection detection sensor 99. When the deflection detection sensor 99 is turned on, the stopped printing drum 2 and the pair of reversing rollers 94a and 94b are rotated again by a command from the control device, and the master 6 after plate making stored in the deflection box 97 is removed. It is wound around the outer peripheral surface of the printing drum 2. As described above, according to the ON / OFF operation of the deflection detection sensor 99, the print drum 2 and the pair of reversing rollers 94a,
The plate 94b rotates intermittently, and the plate feeding operation of the master 6 after the plate making onto the outer peripheral surface of the printing drum 2 proceeds.

From the number of steps of the master transport motor 19,
When the control device determines that the master 6 for which one plate has been made has been made, the operation of the platen roller 92 and the tension roller pair 93a, 93b is stopped by a command from the control device. Then, the rotary blade of the cutter 95 moves to cut the rear end of the master 6 having been made into a predetermined length.

The plate feeding operation of the plate-making master 6 on the outer peripheral surface of the printing drum 2 further proceeds, and the plate-making operation state shown in FIG. 14 is passed. In the vicinity of the free end after passing through the nip portions 94a and 94b, the master 6 for which a predetermined amount of plate making has been performed is wound around the outer peripheral surface of the printing drum 2 based on a signal from a rotation position sensor of the printing drum 2 not shown. It is determined by the control unit that the rear end of the master 6 for which one plate has been made has just been wound, and the solenoid 57 of the unit displacement means 55 is turned off by a command from the control unit. Thus, as shown in FIGS. 8 and 9, the master plate feeding unit 30 swings clockwise about the support shaft 41 by the urging force of the spring 59, and the unit side plate pair 42a,
Each locked portion 42c of the plate making 42b is a pair of plate making side plates 29a, 29b.
The master plate feeding unit 30 occupies the separated position by being engaged with each of the locking portions 29c, and is held at this separated position. Since the master plate supply unit 30 occupies the separated position, the master plate supply unit 30 does not interfere with the master clamper 11 and the like even when printing is started. When the printing drum 2 rotates in the direction A in the drawing and finishes winding the stencil master 6 for one plate, the plate feeding process is completed.

Therefore, according to the second embodiment, the master plate feeding unit 30 occupies the guide position until immediately before the completion of the winding of the plate-making master 6 around the printing drum 2, so that the plate making operation is completed. The rear end of the master 6 is in a free regulation state sandwiched between the nip portions of the pair of reversing rollers 94a and 94b, and air is supplied between the outer peripheral surface of the printing drum 2 and the master 6 which has been made and wound around the printing drum 2. In addition, since the length of the free end of the rear end of the stencil master 6 is short, the occurrence of deflection can be suppressed to a very small value. Even if the synthetic fiber base master 6 is weak and soft, or even if the synthetic fiber base master 6 is stored for a long time in a high temperature state and the curl due to its curling becomes large, While it is aligned along the printing drum 2 the outer peripheral surface without generating wrinkles or bending or the like, can be wrapped neatly.

The unit displacement means 55 is not limited to the structure having the solenoid 57 and the spring 59 and the like. Instead of the solenoid 57, for example, a means provided with a drive motor, a cam and a biasing means, or a drive motor direct connection type It may be driven by a motor.

The second embodiment is not limited to the above, and the master rear end alignment member 13 in the first embodiment of FIGS. 1 to 3 may be added to the configuration shown in FIGS. 6 to 14. . With this configuration, in addition to the above-described advantages of the second embodiment, the above-described specific advantages of the master rear end alignment member 13 can be obtained.

(Embodiment 3) A third embodiment (hereinafter, simply referred to as "Embodiment 3") will be described with reference to FIGS. In the third embodiment, when the printing drum 2 is rotated to wind at least the rear end of the stencil master 6, the rear end of the stencil master 6 is aligned along the outer peripheral surface of the printing drum 2. The third embodiment has a master rear end aligning means 65 different from the first and second embodiments. This master rear end alignment means 65
A contact alignment position shown in FIG. 16 which is provided near the outer peripheral surface of the printing drum 2 and which comes into contact with the outer peripheral surface of the printing drum 2 to contact the rear end of the stencil master 6 to align the rear end of the master 6. A master pressing roller 66 as a master rear end pressing member that can be displaced between a contact alignment position and a separation position shown in FIG. 15, and displaces the master pressing roller 66 between the contact alignment position and the separation position. And a pressing roller displacing means 71 as a pressing member displacing means.

The contact alignment position is defined as the master pressing roller 66.
Is a position where it can come in contact with the rear end of the prepressed master 6 so as not to interfere with the outer peripheral surface of the printing drum 2.
The printing drum 2 is formed along the outer peripheral surface without causing wrinkles, bending, etc., at the rear end of the master 6 after plate making.
It refers to the position where it can be wound around the outer peripheral surface. The separated position refers to a position that is spaced outward from the outer peripheral surface of the printing drum 2 to such an extent that the master pressing roller 66 does not interfere with the protruding portions of the master clamper 11 and the razor portion 5 provided on the printing drum 2.

The holding roller displacing means 71 has an arm support shaft 68 whose both ends are rotatably supported by the pair of plate making side plates 29a and 29b, and is integrally attached to both ends of the arm support shaft 68, and one end thereof. A pair of roller arms 67a, 67b rotatably supporting the master pressing roller 66 via a roller shaft 66a, a sector gear 67c formed at the other end of the roller arm 67a on the near side, and a sector gear 67c.
and a driving motor 69 having an output shaft 69a having a driving gear 70 that meshes with the driving gear c.

The master press roller 66 extends in the direction of the support shaft 7 of the print drum 2. The master pressing roller 66 is made of a sponge-like elastic member such as foamed polyurethane rubber and is formed integrally with the roller shaft 66a. The drive motor 69 includes, for example, a stepping motor.

Next, the operation of the third embodiment will be described focusing on differences from the operation of the second embodiment. When the plate discharging process, which has been proceeding in parallel with the plate making process, is completed and the printing drum 2 stops at the plate feeding position shown in FIG. 15, the plate feeding process is started immediately. At this time, the plate making operation for the master 6 is continued in the thermal head 91 (see FIG. 7).
The master press roller 66 occupies the separated position when the drive motor 69 is turned off. Then, in the same manner as in the operation of the second embodiment, when it is determined from the number of steps of the master transport motor 19 that the master 6 having a predetermined length of plate-making has been sent by the rotation of the pair of reversing rollers 94a, 94b, the master clamper By closing 11, the leading end of the master 6, which has been made, is locked on the outer peripheral surface of the printing drum 2. After the master clamper 11 is closed, the electromagnetic clutch 34 is turned off by a command from the control device.

Next, the electromagnetic clutch 34 is turned off by a command from the control device, and at the same time, the main motor is driven to rotate, so that the printing drum 2 is moved in the direction A (clock The stencil master 6 is wound around the outer peripheral surface while rotating in the circumferential direction.

The master winding operation by the rotation of the printing drum 2 progresses, and the printing drum 2 rotates to a position where the master clamper 11 on the outer peripheral surface of the printing drum 2 does not interfere with the master pressing roller 66 when the master drum occupies the contact alignment position. By the way, the drive motor 69 of the pressing roller displacement means 71 is driven to rotate forward by a command from the control device. As shown in FIG. 16, the sector gear 67c meshing with the drive gear 70 is rotated counterclockwise by a predetermined angle by the rotational drive of the drive motor 69, so that the master pressing roller 66 moves the arm support shaft 68. Arrow direction in the figure as the center (counterclockwise direction)
And occupies the contact alignment position and is held at this contact alignment position. The holding state of the master pressing roller 66 at the contact alignment position is maintained at least until immediately before the winding of the rear end of the master 6 having been made.

From the number of steps of the master transport motor 19,
After making a master for one plate, the rear end of the master 6 is cut by a cutter 95 to a predetermined length, and then the rear end of the master 6 is turned to a reversing roller pair 9.
In the vicinity of the free end after passing through the nip portions 4a and 94b, a master 6 for which a predetermined amount of plate has been made is wound around the outer peripheral surface of the printing drum 2 based on a signal from a rotation position sensor of the printing drum 2 not shown. It is determined by the control device that the rear end of the master 6 for which one plate has been made has just been wound, and the drive motor of the presser roller displacement means 71 is driven in reverse by a command from the control device. Thereby, each component of the press roller displacing means 71 operates in the opposite direction to the operation direction occupying the contact alignment position described above,
The master plate supply unit 30 does not interfere with the master clamper 11 and the like even when the printing is started by returning to the original separated position.

Incidentally, the roller arm pair 67a, 67b
When the master press roller 66 occupies the contact alignment position, the swing range may be regulated by a stopper member (not shown) for holding and stopping the master press roller 66 at the contact alignment position. Further, the roller arm pair 67a, 67
b may be urged by urging means (not shown) such as a tension spring in a direction in which the master pressing roller 66 occupies the separated position. In addition to the stopper member and the urging means, the roller arm 67a or the roller arm 6
A light-shielding filler (not shown) for detecting the contact alignment position of the master pressing roller 66 is attached to a portion near the sector gear 67c of 7b, and the light-shielding filler is selectively engaged with the plate making side plate 29a or the plate making side plate 29b. By providing a light transmission type photosensor, control may be provided such that when the master press roller 66 is displaced from the contact alignment position, the drive of the drive motor 69 is stopped as an error.

Therefore, according to the third embodiment, the master press roller 66 occupies the contact alignment position until immediately before the completion of the winding of the master 6 on the printing drum 2, so that the master making is completed. When the rear end of the master 6 has come out of the nip portion of the pair of reversing rollers 94a and 94b, the master 6 is in a free-regulated state. Air entry can be reduced, and generation of deflection can be suppressed to a very small level.
In contrast, even if the synthetic fiber base master 6 has a low rigidity and a low waist and is soft, or even if the synthetic fiber base master 6 has been stored for a long time in a high temperature state and curled by its curling, the printing drum 2 While being aligned along the outer peripheral surface, it can be wound neatly without generating wrinkles or bending.

The pressing roller displacement means 71 is not limited to the direct drive method using the drive motor 69, but may be a drive method using a solenoid and an urging means.

The third embodiment is not limited to the above, and the master rear end alignment member 13 in the first embodiment of FIGS. 1 to 3 may be added to the configuration shown in FIG. With this configuration, in addition to the above-described advantages of the third embodiment, the above-described unique advantages of the master rear end alignment member 13 can be obtained.

Master plate supply unit 3 in Embodiment 2
Timing of displacement to zero guide position, or Embodiment 3
The timing at which the master press roller 66 is displaced to the contact alignment position is not limited to the displacement timing in each of the plate feeding operations described above, but just before the end of the winding of the plate-making master 6 on the printing drum 2, in other words, the printing drum. The rotation may be performed when at least the rear end of the master 6 is wound by the rotation of the second rotation.

As described above, the present invention has been described with reference to the specific embodiments including the examples. However, the configuration of the present invention is not limited to the above-described first to third embodiments and the like. It will be apparent to those skilled in the art that various embodiments and examples may be configured according to the necessity and application within the scope of the present invention.

[0099]

As described above, according to the first and seventh aspects of the present invention, when at least the rear end of the master is wound by rotating the print drum, the rear end of the master is attached to the outer peripheral surface of the print drum. Has a master trailing edge aligning means that aligns along the line, making it difficult for air to enter between the outer peripheral surface of the print drum and the master wound around it, so that the rear end of the master is It is wound while being aligned along. Therefore, when a master having a very small thickness, such as a synthetic fiber base master, and having a small rigidity and a low stiffness is wound around the print drum, the free movement of the rear end of the master causes the outer peripheral surface of the print drum to be wrapped around the print drum. It is possible to provide a printing apparatus which eliminates a state in which air easily flows between the master and the master being wound around, and which does not wrinkle or bend and is wound around.

According to the second and third aspects of the present invention, the master rear end aligning means is provided on the outer peripheral surface of the print drum along the generatrix of the print drum so as to be able to contact the rear end of the master. By being a substantially comb-shaped master rear end alignment member having an air vent formed in a substantially groove shape, the printing drum is freed when the rear end of the master is separated from the master conveying means and becomes free. At the rear end of the mesh screen and near the leather part, the free behavior causes a warp and the deflection occurs, and even if there is air trapped between the outer peripheral surface of the print drum and the master wound around it, By the action of the air vent portion of the end alignment member, the air is steadily removed from the air vent portion while the flow of the air is adjusted and adjusted, so that the deflection can be kept very small. At the time of printing in such a state, when the rear end of the master passes through the air knife fan, even if the air blows from the air knife fan acts to increase the deflection, the same master rear end alignment as described above is performed. By the action of the air vent portion of the member, the growth of deflection is suppressed. Therefore, it is possible to eliminate the state in which air easily enters between the outer peripheral surface of the printing drum and the master wound around the printing drum due to the free behavior of the rear end of the master, and the winding can be performed without generating wrinkles or bending. .

According to the fourth aspect of the present invention, the master rear end alignment member is provided at a so-called ink trailing edge portion over the non-effective image area and the ink impermeable area on the outer peripheral surface of the printing drum. As a result, the trailing edge of the master is prevented from adhering due to the ink leaking from the tail, so that the free movement of the trailing edge of the master causes air to flow between the outer peripheral surface of the printing drum and the master wound around it. It is possible to surely eliminate the condition that makes it easy to enter, and to more securely wind without causing wrinkles or bending.

According to the fifth and seventh aspects of the present invention, the master rear end aligning means includes a guide position at which the master conveying means approaches the print drum outer peripheral surface and guides the master rear end along the print drum outer peripheral surface. A master plate feeding unit configured to be displaceable between a separation position separated from the guide position,
A unit displacing means for displacing the master plate feeding unit between the guiding position and the separating position, so that when the master dispensing unit occupies the guiding position by the operation of the unit displacing means, the rear end of the master The section is in a free-regulated state by the master conveying means, so that air can be reduced from entering between the outer peripheral surface of the printing drum and the master wound around the printing drum, and the free state length of the rear end of the master can be reduced. Since the length is short, the generation of deflection can be suppressed to an extremely small value. As a result, even when the master having a very small thickness, such as a synthetic fiber base master, and a rigid, stiff, soft waist is wound around a print drum, the free movement of the rear end of the master is kept to a minimum. The present invention can provide a printing apparatus which eliminates a state in which air easily enters between the outer peripheral surface of the printing drum and the master wound around the printing drum, and which does not generate wrinkles and is wound around. it can.

According to the sixth and seventh aspects of the present invention, the master rear end aligning means is provided near the outer peripheral surface of the printing drum, approaches the outer peripheral surface of the printing drum, and comes into contact with the rear end of the master. A master rear end holding member displaceable between a contact alignment position for aligning the end portion and a separation position separated from the contact alignment position; and a master rear end holding member displaced between the contact alignment position and the separation position. When the master rear end pressing member occupies the contact alignment position by the operation of the pressing member displacing means, the rear end of the master is in a free regulated state by the master rear end pressing member. Air flow between the outer peripheral surface of the print drum and the master wound around the print drum can be reduced, and the free length of the rear end of the master is short. Also occurs can be suppressed extremely small. As a result, even when the master having a very small thickness, such as a synthetic fiber base master, and a rigid, stiff, soft waist is wound around a print drum, the free movement of the rear end of the master is kept to a minimum. The present invention can provide a printing apparatus which eliminates a state in which air easily enters between the outer peripheral surface of the printing drum and the master wound around the printing drum, and which does not generate wrinkles and is wound around. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a state in which a master rear end alignment member according to a first embodiment of the present invention is disposed on a printing drum.

FIG. 2 is a perspective view of a main part showing an operation of a master rear end alignment member according to the first embodiment.

FIG. 3 is a sectional view taken along S3-S3 in FIG. 2;

FIG. 4 is a sectional view of a synthetic fiber base master used in the first embodiment and the like.

FIG. 5A is a perspective view showing an outline of a tester for measuring the rigidity of a master, and FIG. 5B is a plan view showing the outline.

FIG. 6 is a perspective view showing a part of a master transport mechanism of a plate making unit according to a second embodiment.

FIG. 7 is a partial cross-sectional front view illustrating a main part around a master stock unit of a plate making unit according to a second embodiment.

FIG. 8 is a perspective view illustrating a part of a master plate supply unit, a unit displacement unit, and a master transport mechanism according to a second embodiment.

FIG. 9 is a front sectional view of a main part showing an initial operation of a master plate feeding unit and unit displacement means when a master leading end is locked in a second embodiment.

FIG. 10 is a front cross-sectional view of a main part showing operations of a master plate feeding unit and unit displacement means at the time of master winding in Embodiment 2.

FIG. 11 is a schematic partial cross-sectional front view illustrating an initial operation of a master plate supplying unit when a master leading end portion is locked in a second embodiment.

FIG. 12 is a schematic partial cross-sectional front view illustrating the operation of the master plate supply unit when the master is locked in the second embodiment.

FIG. 13 is a schematic partial cross-sectional front view illustrating the operation of the master plate feeding unit when the master is wound in the second embodiment.

FIG. 14 is a schematic partial cross-sectional front view illustrating the operation of the master plate supply unit immediately before the end of master winding in the second embodiment.

FIG. 15 is a partial cross-sectional front view of a main part illustrating operations of a master pressing roller and a pressing roller displacement unit when a master distal end portion is locked in a third embodiment.

FIG. 16 is a partial cross-sectional front view of a main part illustrating operations of a master pressing roller and a pressing roller displacement unit when a master is wound in a third embodiment.

FIG. 17 is a schematic front view of a conventional stencil printing apparatus to which an embodiment of the present invention is applied.

FIG. 18 is a schematic front view for explaining a conventional problem at the time of winding a rear end portion of a master by rotation of a printing drum.

19 (a) shows a problem at the time of winding the rear end portion of the master before printing in FIG. 18, and FIG. 19 (b) shows a problem in FIG.
7 is a perspective view of a main part for describing a problem of a rear end portion of the master after printing in FIG.

20 is a front cross-sectional view of a main part for describing an operation state at the time of winding the rear end portion of the master in the stencil printing apparatus of FIG. 17;

[Explanation of symbols]

2 Print Drum 6 Master 13 Master Rear End Alignment Member 14 Air Vent 17, 65 Master Rear End Alignment Means 18 Master Transport Mechanism 30 Master Plate Feed Unit 55 Unit Displacement Means 57 Solenoid Constituting Unit Displacement Means 66 Master Rear End Pressing Member Presser roller 71 as a presser roller displacing means 94a, 94b as a pressing member displacing means A pair of reversing rollers as a master conveying means X master width direction Y master conveying direction

Claims (7)

[Claims] A printing drum for winding a master around an outer peripheral surface;
A master transporter disposed near the outer peripheral surface of the print drum and supplying the master made by the plate making machine to the outer peripheral surface of the print drum, wherein the leading end of the master supplied from the master transporter is connected to the print drum. After locking to the outer peripheral surface,
In a printing apparatus for winding the master around the outer peripheral surface of the print drum by rotation of the print drum, when winding at least the rear end of the master by rotation of the print drum, the rear end of the master is connected to the outer periphery of the print drum. A printing apparatus comprising a master rear end aligning means for aligning along a surface. 2. The printing apparatus according to claim 1, wherein the master rear end aligning means is provided on the outer peripheral surface of the printing drum so as to be able to contact the rear end of the master and along a generatrix of the printing drum. A printing apparatus, comprising: a master rear end alignment member provided with an air vent. 3. The printing apparatus according to claim 2, wherein the master rear end alignment member has a substantially comb shape in which the air vent portion is formed in a substantially groove shape. 4. The printing apparatus according to claim 2, wherein the outer peripheral surface of the printing drum includes an ink-permeable area including an ink-ineffective non-effective image area, and an ink-impermeable ink-impermeable area. Wherein the master rear end alignment member is provided over the non-effective image area and the ink impermeable area on the outer peripheral surface of the printing drum. 5. The printing apparatus according to claim 1, wherein the master rear end aligning means guides the rear end of the master along the print drum outer peripheral surface by approaching the outer peripheral surface of the print drum. A master plate feeding unit configured to be displaceable between a guiding position to be moved and a separating position separated from the guiding position, and unit displacing means for displacing the master plate feeding unit between the guiding position and the separating position. A printing device comprising: 6. The printing apparatus according to claim 1, wherein the master rear end aligning means is provided near the print drum outer peripheral surface, approaches the print drum outer peripheral surface, and comes into contact with the master rear end portion. A master rear end pressing member that can be displaced between a contact alignment position that aligns the rear end of the master and a separation position that is separated from the contact alignment position; and And a pressing member displacing means for displacing the pressing device between the printing device and the printing apparatus. 7. The printing apparatus according to claim 1, wherein the master comprises a thermoplastic resin film and an ink-permeable porous support containing at least synthetic fibers. A printing device, which is a base master.