JP2003118220A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein a work is hard to be done caused by the work to be performed by avoiding a sharp distal end of a release pawl when a wind-up occurs or at cleaning a pressing roller or the like. SOLUTION: A stencil printer comprises a plate cylinder 1 for winding a plate-made master 8, the pressing roller 15 for relatively pressing a sheet 29 to the master 8 on the plate cylinder 1, and the release pawl 50 selectively occupying a release position for releasing the sheet 29 from the plate cylinder 1 by approaching to the outer peripheral surface of the plate cylinder 1 at the distal end 50a and a non-release position separated from the release position. The printer further comprises a guide storing member 54 for protruding the distal end 50a when the pawl 50 occupies the release position at the time of printing and storing the distal end 50a when the pawl 50 occupies the non-release position at the time of non-printing. The guide storing member 54 has a function of linearly guiding the pawl 50 and is fixed on the printer body side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus including a stencil printing apparatus and the like. More specifically, the present invention relates to a technique for accommodating the tip (tip) of a peeling member of a paper discharge device in a printing apparatus or the tip (tip) of a peeling member provided for each of a plurality of plate cylinders in a multicolor printing apparatus or the like. Is.

[0002]

2. Description of the Related Art A stencil master having a laminated structure in which a thermoplastic resin film and a porous support made of Japanese paper fibers or synthetic fibers, or a mixture of Japanese paper fibers and synthetic fibers are laminated (hereinafter, simply referred to as "master"). ")
By contacting the heating element of the thermal head with the heat
Plate-making, and this plate-making master (hereinafter sometimes referred to as "plate-making master") is wound around a rotatable plate cylinder with a structure in which a mesh screen made of resin or metal mesh is wound around multiple layers. Ink is supplied from the ink supply member provided inside the plate cylinder, and the paper is continuously pressed against the master on the plate cylinder by a pressing means such as a press roller to open the plate cylinder. A heat-sensitive digital stencil printing device is known in which ink is bleeding from a perforated portion to perform printing.

In such a stencil printing machine, the ink that has passed between the fibers of the porous support of the master is transferred from the perforated portion of the thermoplastic resin film to the exudation paper and printing is performed. Due to the adhesive force of the ink, the paper easily sticks to the plate cylinder, and a problem called "rolling up" in which the paper sticks to the plate-made master on the plate cylinder and is not discharged tends to occur. Therefore, a peeling claw (peeling member), which is also called a paper discharge claw or a separation claw, is provided on the outer peripheral surface of the plate cylinder, and the above-mentioned is provided between the plate-making master on the plate cylinder and the leading edge of the sheet that has just floated. A paper forced peeling method of forcibly peeling a paper is mainly used in a mode of inserting a peeling claw.

[0004]

However, since the floating of the paper from the master on which the plate has been made depends on the stiffness of the paper itself, the floating amount of the paper is very small. Therefore, the tip of the peeling claw that is inserted into the gap created by the floating of the paper has to be thin and sharp. There is no problem if there is no trouble when performing the peeling operation of the paper with the peeling claw having such a shape, but for example, when the viscosity of the ink decreases in a high temperature environment or the like, the ink is removed from the opening portion of the plate cylinder. Due to the large amount of ink that oozes out and transfers to the paper, and in the case of printing where there is a solid plate-making image on the plate cylinder, especially at the leading edge of the plate-made master, the increased ink sticking on that part Due to the force, the leading end of the paper easily sticks to the master on the plate cylinder, which has already been prepressed, and the rolls are likely to occur.

When such winding occurs,
An operator or a user (hereinafter referred to as “user”) pulls out the plate cylinder from the printing apparatus main body (hereinafter referred to as “apparatus main body”) and inserts a hand or the like to remove the plate cylinder. Since the tip gives anxiety, it was troublesome to work while avoiding it. Also, when cleaning the press roller and the like, the work is difficult to do because the work is performed while avoiding the tip of the peeling claw.

On the other hand, in the paper forced peeling method of the type that assists the floating of the paper by using air or the like, the amount of the floating of the paper can be increased, so that the sharpness of the tip of the peeling claw to be inserted can be reduced, but it is compressed and discharged. As the air (air) that is generated easily causes the problem that the thermoplastic resin film part of the master is torn, the air pressure cannot be increased too much, and the sharpness of the tip of the peeling claw cannot be reduced so much. It was

Therefore, the present invention has been made in view of the above circumstances, and it is not necessary to pay attention to the tip portion of the peeling claw at the time of trouble handling such as winding up or cleaning the inside of the printing apparatus. An object is to provide a printing device.

[0008]

In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention has the following features in the invention as set forth in each claim. . According to a first aspect of the present invention, a plate cylinder around which a master made by plate making is wound, pressing means for relatively pressing a sheet against the master on the plate cylinder, and the tip of the plate cylinder being close to the outer peripheral surface of the plate cylinder, In a printing device comprising a peeling member for selectively peeling a peeling position for peeling a sheet from a cylinder and a non-peeling position separated from the peeling position, when the peeling member occupies the peeling position during printing, It is characterized in that it has a storage member which projects the tip and stores the tip when the peeling member occupies the non-peeling position during non-printing.

According to a second aspect of the invention, in the printing apparatus according to the first aspect, the storage member has a function of guiding the peeling member between the peeling position and the non-peeling position. To do.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the printing apparatus described above, the storage member is fixed to the apparatus main body side.

The invention according to claim 4 is the invention according to claim 1 or 2.
In the printing apparatus described above, the storage member can be displaced in association with a displacement operation of the peeling member between the peeling position and the non-peeling position.

According to a fifth aspect of the present invention, a plate cylinder around which the master made by plate making is wound, pressing means for relatively pressing a sheet against the master on the plate cylinder, and a tip of the plate cylinder close to the outer peripheral surface of the plate cylinder. In a printing apparatus having a peeling member for selectively peeling off a sheet from the plate cylinder and a non-peeling position separated from the peeling position, the peeling member occupies the peeling position during printing. When protruding the tip,
When the peeling member occupies the non-peeling position during non-printing, the peeling member is movably guided so as to accommodate the leading end, and the peeling member between the peeling position and the non-peeling position. Of the guide accommodating member displaceable in conjunction with the displacement operation of the separating member and the peeling member occupying the peeling position during the printing, supply air to the peeling member in a direction in which the tip is projected from the guide accommodating member. And an urging means for urging the leading end in the guide storing member when the peeling member occupies the non-peeling position during the non-printing. I am trying.

According to a sixth aspect of the present invention, a plate cylinder around which the master made is wound, pressing means for relatively pressing a sheet against the master on the plate cylinder, and a tip of the plate cylinder close to the outer peripheral surface of the plate cylinder. In a printing apparatus having a peeling member for selectively peeling off a sheet from the plate cylinder and a non-peeling position separated from the peeling position, the peeling member occupies the peeling position during printing. When protruding the tip,
When the peeling member occupies the non-peeling position at the time of non-printing, the guide accommodating member fixed to the apparatus main body side, which guides the peeling member movably so as to accommodate the leading end, and the peeling member. An air supply unit that supplies air to the peeling member in a direction in which the tip is projected from the guide storage member when the peeling position is occupied during printing, and the non-peeling position when the peeling member is not printing. Urging means for urging the inside of the guide storage member in a direction in which the tip is stored.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the printing apparatus described above, when the peeling member occupies the peeling position during the printing, a discharge port to which a part of the air from the air supply unit is supplied is provided in the peeling member near the tip. It is characterized by

Structure of "pressing means for pressing paper relative to the master on the plate cylinder" in claims 1, 5 and 6
As a method, a press roller method that presses a press roller as a pressing means that can be brought into contact with and separated from the outer peripheral surface of the plate cylinder via a master that has been prepressed, and a press roller that presses the outer peripheral surface of the plate cylinder through a master that has been prepressed. There are an impression cylinder contact / separation method in which the impression cylinder is pressed for printing, a plate cylinder contact / separation method in which the plate cylinder is pressed against the impression cylinder for printing via a master that has already been prepressed, and a combination of these methods. . The plate cylinder contact / separation method includes the entire drum contact / separation method in which the entire plate cylinder is pressed toward the impression cylinder, and the medium press roller in the plate cylinder is extruded toward the impression cylinder so that only the plate cylinder (print drum drum plate cylinder) is pressed. There is a plate cylinder extrusion method of pressing. As a plate cylinder extrusion method, for example, Japanese Patent Laid-Open No. 1-2
No. 04781, Japanese Patent Laid-Open No. 3- 197078, Japanese Patent Laid-Open No. 3-259484, etc., a metal screen is bulged from the inside to the outside.
A so-called middle-pressing roller system (including one also serving as an ink supply roller) can be used.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention including examples with reference to the drawings (hereinafter, simply referred to as "embodiments")
Will be explained. Throughout the embodiments and modified examples, components such as members and components having the same function and shape are designated by the same reference numerals, and the description thereof will be omitted once described. In order to simplify the drawing and the description, even the constituent elements that should be represented in the drawing may be appropriately omitted without special description in the drawing. When a configuration, an operation example, or the like is described by citing an open patent publication or the like, reference numerals of constituent elements or the like that have been quoted are referred to by parentheses to distinguish them.

(Embodiment 1) First, the overall construction of a stencil printing machine as an example of the printing machine according to the first embodiment will be described with reference to FIG. As shown in FIGS. 1 and 2, the stencil printing apparatus generally includes a plate making apparatus 14 for making a master 8 which is arranged on the upper right side of FIG.
1, a plate cylinder 1 around which a master 8 arranged in the substantially left central portion in FIG. 1 (hereinafter, sometimes referred to as “master 8 that has already been plate-made”) is wound, and a plate cylinder 1 on the plate cylinder 1. The press roller 15 as a pressing unit that presses the paper 29 against the master (not shown) that has been plate-formed, and the paper 29 that is placed below the plate-making device 14 and is stacked on the paper feed tray 28 as the paper feed tray. A sheet feeding device 30 that feeds between the plate cylinder 1 and the press roller 15, and a printed sheet 29 from the plate-made master 8 on the plate cylinder 1 whose front end is close to the outer peripheral surface of the plate cylinder 1. 2 includes the air knife 31 as a peeling member that selectively occupies the peeling position shown in FIG. 2 and the like and the non-peeling position shown in FIG.
And a paper discharge device 45 which is arranged at a position facing the paper supply device 30 via the press roller 15 and discharges the printed paper 29 to a paper discharge tray (not shown) as a paper discharge tray.

In addition to the above-mentioned devices and components, the stencil printing device reads the image of a document which is publicly known and which is arranged above the plate cylinder 1 and the plate-making device 14 and is transferred from the document receiving tray. Document reading device and paper discharge device 45
And a document discharge device, which is disposed near the left side of the plate cylinder 1 and discharges a used master 8 peeled off from the outer peripheral surface of the plate cylinder 1 to a plate discharge box (not shown). is doing. The document reading device and the plate discharging device are disclosed in, for example, Japanese Patent No. 2756224 (Japanese Patent Laid-Open No. 7-5).
No. 2515), the same configuration as that shown in FIG. 1 is provided.

The plate making apparatus 14 includes a master supporting member 8c as a master supporting means for supporting the master 8 so that the master 8 can be drawn out in the master conveying direction X1, and a thermal head 10 for heating and plate making the master 8 drawn out according to image information. , The platen roller 9 that conveys the master 8 while rotating the master 8 downstream in the master conveyance direction X1 while pressing the master 8 against the thermal head 10, and cuts the plate-making master 8 or the plate-making master 8 to a predetermined length. A pair of conveying rollers 12 and 12 (hereinafter, referred to as "conveying roller pair 1" that conveys the master 11 conveyed by the cutter 11 and the platen roller 9 toward the clamper 7 that has expanded the plate cylinder 1 while applying an appropriate tension.
2 ") and the like.

The master 8 is in the form of a continuous sheet, and is wound around a synthetic resin roll core 8b to form a master roll 8a.
Is formed. The roll core 8b projects from both end surfaces of the master roll 8a and is formed to be longer than the width of the master 8. In the master roll 8a, the roll cores 8b on both ends are rotatably supported in the counterclockwise direction by a master support member 8c, and are removable from the master support member 8c. The master support members 8c on both end sides are slidably attached to plate-making side plate pairs (not shown) disposed on both left and right sides of the plate-making apparatus 14 along the master transport direction X1. The plate making side plate pair is fixed to the apparatus body. Therefore, the master 8 is supported by the master support member 8c so as to be able to be fed out from the master roll 8a in the master transport direction X1.

The master 8 has a laminated structure in which, for example, a thermoplastic resin film having a thickness of 1 to 5 μm and a porous support made of synthetic fiber are bonded together. Note that the master is not limited to this, for example, a laminate of a porous support and a thermoplastic resin film made of Japanese paper fibers, or a mixture of Japanese paper fibers and synthetic fibers, or a so-called substantially thermoplastic resin. A master made of only a resin film is also used.

The thermal head 10 includes a platen roller 9
It is provided to extend parallel to the platen roller axis of
By a contacting / separating mechanism including a cam, a spring member, and the like (not shown), the platen roller 9 can be contacted and separated via the master 8. The thermal head 10 is urged by the spring member in a direction in which it contacts the platen roller 9. In the main scanning direction of the thermal head 10, the platen roller 9
A large number of heat generating elements (not shown) are arranged at the portions that come into contact with each other via the master 8. The thermal head 10 selectively heats and melts the master 8 by selectively heating the heating element based on a digital image signal which is processed and sent by an A / D converter and a plate-making control device (both not shown). -Has a well-known function as plate making means for plate making.

The platen roller 9 is formed integrally with the platen roller shaft via a metal cored bar. The platen roller 9 is rotatable in the clockwise direction because both ends of the platen roller shaft are rotatably supported by the plate making side plate pair. The platen roller 9 is connected to a stepping motor (not shown) as a platen roller driving means via a rotation transmission member (not shown) such as a timing belt or a gear, and is rotationally driven clockwise by this. As described above, the master 8 is pulled out from the master roll 8a by driving the platen roller 9 to rotate clockwise by the stepping motor.

The conveying roller pair 12 is provided in such a manner that it is pressed against each other by an appropriate pressing force by a biasing means such as a spring, and both ends of each roller shaft are rotatably supported by the plate making side plate pair. Therefore, they can rotate in opposite directions. The conveyance roller pair 12 includes a rotation transmission member such as a plurality of gears (not shown) so that the upper conveyance roller 12 rotates at a peripheral speed (conveyance speed) slightly higher than the peripheral speed (conveyance speed) of the platen roller 9. And is connected to the stepping motor via, for example, a powder type electromagnetic clutch (not shown). The powder type electromagnetic clutch applies a front tension between the platen roller 9 and the conveying roller pair 12 as a predetermined tension so as not to force the master 8 out of the nip portion between the platen roller 9 and the thermal head 10. It has a function of giving to the master 8. As described above, the pair of transport rollers 12
While sliding with the master 8, an appropriate front tension is applied to the master 8 that has been prepressed. It should be noted that instead of the electromagnetic clutch, a stepping motor independent of the stepping motor is used to convey the conveying roller pair 12
May be driven independently.

Master transport direction X adjacent to the transport roller pair 12
A curved guide plate 13 for guiding the tip of the plate-making master 8 to the clamper 7 of the plate cylinder 1 is provided on the downstream side of the drawing roller 1 so as to extend in each axial direction of the conveying roller pair 12.

The cutter 11 is a well-known guillotine type which is provided above and below the master conveyance path between the platen roller 9 and the conveyance roller pair 12 and has a fixed blade 11b and a movable blade 11a. The cutter 11 is not limited to the guillotine type, but may be a rotary blade moving type in which the movable blade moves while rotating in the master width direction orthogonal to the master transport direction X1.

The plate cylinder 1 is composed of a porous cylindrical support cylinder and a mesh screen (not shown) made of resin or metal mesh wound around a plurality of layers so as to cover the outer periphery of the support cylinder. It has a two-layer structure. The plate cylinder 1 has a well-known configuration including an opening portion 1a (printable area) having a large number of ink-permeable openings and a non-opening portion (non-printable area) provided with a clamper 7 and the like. Have. Plate cylinder 1
Is wound around and fixed to an outer peripheral portion of an end plate flange (not shown), and is rotatably supported around a support shaft that also serves as an ink pipe 5 described later. The plate cylinder 1 is connected to an electric motor (not shown) via a drive transmission means such as a gear or a belt (not shown), and is rotationally driven by the electric motor in the arrow direction (clockwise direction). As the electric motor, for example, a control DC motor is used.

Inside the plate cylinder 1, an ink side plate (not shown) fixed to the ink pipe 5 is rotatably supported, and the rotational driving force of the electric motor is transmitted by drive transmission means such as a gear (not shown). And the ink roller 2 which is driven to rotate in the direction of the arrow (clockwise direction) in the drawing in synchronization with the plate cylinder 1 and contacts the inner peripheral surface of the plate cylinder 1 to supply ink, and a small gap between the ink roller 2 and the ink roller 2. A doctor roller 3 which is placed parallel to each other and forms an ink reservoir 4 having a wedge-shaped cross section with the ink roller 2, and an ink pipe 5 which supplies ink to the ink reservoir 4 are disposed. Ink roller 2,
The doctor roller 3 and the ink pipe 5 form ink supply means. The ink in the ink pool 4 is sucked by an ink pump (not shown) provided outside the plate cylinder 1 by an ink pump (not shown), and is supplied from a supply hole of the ink pipe 5 to be kneaded. The ink in the ink reservoir 4 is supplied in a thin film on the outer peripheral surface of the ink roller 2 while being metered by the doctor roller 3, and the outer peripheral surface of the ink roller 2 comes into contact with the inner peripheral surface of the support cylinder of the plate cylinder 1. It is supplied to the opening portion 1a of the plate cylinder 1.

A part 6 of the plate cylinder 1 on the outer peripheral surface of the non-opening part is provided with a stage 6 made of a ferromagnetic material along one generatrix of the plate cylinder 1 and at both ends of the stage 6. Further, a clamper 7 which is rotatably attached to the clamper shaft and has a rubber magnet that can be opened and closed with respect to the flat surface portion of the stage 6 is provided. The clamper 7 is opened and closed at a predetermined position by an opening / closing device (not shown) provided on the device body side (not shown). The plate cylinder 1 is arranged so that the clamper 7 is stopped in a state in which the clamper 7 is located substantially on the right side of FIG. 1, that is, at the plate feeding position. The plate cylinder 1 is configured as a plate cylinder unit integrally formed with the ink pack, the ink pump, and the like, and can be inserted into and removed from the apparatus body in the axial direction of the ink pipe 5, that is, can be attached and detached. ing. As an attaching / detaching means for detachably attaching the plate cylinder unit as described above, for example, Japanese Patent Laid-Open No. 2001-2001
An example of the configuration disclosed in FIG.

A press roller 15 is disposed in the vicinity of the lower side of the outer peripheral surface of the plate cylinder 1 facing the ink roller 2 so as to come into contact with and separate from the outer peripheral surface of the plate cylinder 1. The press roller 15 presses the paper 29 against the master 8 on the plate cylinder 1 which has been prepressed.
And a second position (which is also the initial position shown in FIG. 1) apart from the first position. Displacement means for displacing the press roller 15 between the first position and the second position is provided at the end of the press roller 15 on the far side as viewed in FIG. The displacement means is mainly composed of an arm shaft 16a, press roller arm pairs 16 and 16 (hereinafter abbreviated as "press roller arm pair 16"), a pressure arm 17, a cam follower 18, a pressure spring 19 and a cam 20. It is configured.

The arm shaft 16a is rotatably supported by a casing side plate (not shown) fixedly provided on the apparatus body side. The press roller 15 is formed so that its lateral width is substantially the same as the lateral width of the plate cylinder 1, and a press roller shaft 15a is fixedly inserted through the center thereof. Both ends of the press roller shaft 15a are rotatably supported by the other end of the press roller arm pair 16 whose one end is fixed to the arm shafts 16a arranged on the front side and the back side of the paper surface in FIG. , Paper 29 on the master that has been prepressed on the plate cylinder 1
It is configured so as to be driven to rotate when pressed through.

The pressure arm 1 is attached to the end of the arm shaft 16a.
One end of 7 is fixed. A cam follower 18 is rotatably held by a shaft at a substantially central portion of the pressure arm 17. At the other end of the pressure arm 17, one end of a pressure spring 19 (tensile spring) for constantly urging the press roller 15 in a direction of being pressed against the outer peripheral surface of the plate cylinder 1 is locked. The other end is locked to the housing side plate side. The other end of the pressure arm 17 is biased by the pressure spring 19 in such a direction as to swing clockwise around the arm shaft 16a. The other end of the pressure arm 17 has a notch (not shown) capable of engaging with a locking member of a locking means (not shown).
Are integrally formed, and the notch can be engaged with and disengaged from the locking member.

On the other hand, a cam shaft 20a, to which a cam 20 that rotates in synchronization with the rotation of the plate cylinder 1 is fixed, is rotatably supported on the housing side plate near the cam follower 18. The cam 20 is, for example, a plate cam having a small diameter portion and a large diameter portion. A belt pulley, a gear or the like (not shown) is fixedly mounted on the cam shaft 20a, and is connected to the electric motor for rotating the plate cylinder 1 through a drive transmission means such as a belt and a gear (not shown). As a result, the cam 20 rotates in synchronization with the rotation of the plate cylinder 1. The cam follower 18 is biased by the pressure spring 19 in such a direction as to always contact the cam 20. The locking means is a known one that holds the press roller 15 at the second position shown in FIG. 1 (strictly, at a position slightly further apart from the second position) except when the paper is being passed (during printing). And includes the above-mentioned locking member, a support shaft, a solenoid, a tension spring (both not shown), and the like. The control means equipped with a microcomputer (not shown) for controlling the operation of the stencil printing apparatus turns on the solenoid based on a sheet passing signal for passing the sheet 29 from a sheet leading edge detecting sensor (not shown) described later. The displacement means is controlled to operate, that is, the press roller 15 is swung / displaced to the first position so that the sheet 29 is pressed against the master 8 on the plate cylinder 1 and the printing operation is performed. Has become.

The paper feeding device 30 includes a paper feeding tray 28 on which papers 29 are stacked so that they can be drawn out and which can be raised and lowered, and a paper feeding tray 2.
The pair of registration rollers 17, 17 in contact with the paper 29 on
A sheet feeding roller 26 and a separating member 27 as a separating / conveying unit that separates and conveys the sheets 29 one by one toward a nip portion (hereinafter abbreviated as “registration roller pair 17”).
And a registration roller pair 17 as registration means for feeding the sheet 29 at a timing between the outer peripheral surface of the plate cylinder 1 and the press roller 15.

In the paper feed tray 28, the top of the stacked papers 29 is always fixed to the paper feed roller 26 by a drive unit (not shown) equipped with a paper feed tray lifting motor and a wire type lifting mechanism (not shown). So that they come into contact with each other with the pressing force of the sheet 29 (the sheet 29 can be conveyed).
The paper 29 is moved up and down while being kept in contact with the pressing force within a transportable range in association with the increase and decrease of Paper feed tray 28
Has a structure capable of using many paper types and paper sizes, and has a structure suitable for a stencil printing apparatus capable of stacking 500 or more sheets of paper 29 having a paper size A3 or A4, for example.

The paper feed roller 26 is integrally formed with a metal paper feed roller shaft 26a, and the paper feed roller shaft 26a is formed.
Has one end rotatably supported by the housing side plate.
The separation member 27 has a member called a separation pad which is made of rubber or resin having a high friction coefficient with respect to the paper 29 and which can contact the paper feed roller 26. The separation pad is biased in a direction in which it is pressed against the paper feed roller 26 by a compression spring (not shown) as a biasing means.
The paper feed roller 26 is connected to a stepping motor (not shown), which is a motor driven by pulse input, via a toothed pulley and a toothed belt, and is rotationally driven in the clockwise direction by the stepping motor.

The registration roller pair 17 is rotatably supported by the housing side plate with a shaft. The upper registration roller 17 is provided so as to come into contact with and separate from the lower registration roller 17 at a predetermined timing. The lower registration roller 17 is connected to a stepping motor (not shown), which is a motor driven by pulse input, via a toothed pulley and a toothed belt, and is rotationally driven counterclockwise by the stepping motor. .

The driving means for rotating the paper feed roller 26 and the registration roller pair 17 is not limited to the above stepping motors, and the rotational driving force from the electric motors is transmitted to the driving force provided with a belt, a gear and a cam. There is also one that is driven in synchronization with the rotation of the plate cylinder 1 through the synchronization means.

In the paper conveyance path from the plate cylinder 1 and the press roller 15 to the nip portion of the registration roller pair 17,
A sheet leading edge detection sensor (not shown) is provided as a sheet leading edge detecting unit that detects the leading edge of the sheet 29 fed from the registration roller pair 17. The paper edge detection sensor is, for example, a reflective optical sensor including a light emitting unit and a light receiving unit.

The paper discharge device 45 is the air knife 3 described above.
1 and when the air knife 31 occupies the peeling position at the time of printing, the tip 31a (hereinafter, referred to as “tip 31a”) is projected, and when the air knife 31 occupies the non-peeling position at the time of non-printing, The printed sheet 29 separated and separated from the plate-finished master 8 on the plate cylinder 1 shown in FIG. 2 by the air knife 31 and the housing member 36 for housing the pointed end 31a are conveyed to the paper ejection tray while being sucked. It is mainly composed of a discharged sheet conveying device 37 for discharging and the above-mentioned sheet discharging tray.

The sheet discharging and conveying device 37 is rotatably supported by the pair of casing side plates and is rotatable in the counterclockwise direction in FIGS. 1 and 2, and is also rotatable by the pair of casing side plates. 1 and 2, a paper discharge roller rear 39 which is driven in a counterclockwise direction in FIG. 1 and FIG. 2 and driven to rotate by a motor (not shown), and a porous paper discharge stretched over the paper discharge roller front 38 and the paper discharge roller rear 39. A belt 40 and a suction fan 41 arranged below the upper paper discharge belt 40 for sucking the peeled and separated printed paper 29 are provided.

The air knife 31 has its tip 31a in the vicinity of the downstream of the printing portion (nip portion) formed by the press roller 15 being pressed against the master 8 on the plate cylinder 1 via the paper 29. It is arranged so that it can be swung and displaced between the peeling position and the non-peeling position. Compared with, for example, the one shown in FIG. 1 and FIGS. 4 to 6 of JP 2001-10195 A, the air knife 31 has a paper guide portion 35 integrally formed in the lower portion of the air knife 31. It is mainly different. That is, the air knife 31 has the paragraph numbers (0025) and (0050) in the specification of JP 2001-10195 A.
Through (0054) and the like.

Specifically, as shown in FIGS. 1 to 4, the air knife 31 has a tip 31a in order to reliably prevent the paper 29 from sticking to the outer peripheral surface of the plate cylinder 1 and rolling up. In addition to having the structure and function of a peeling claw which is also called a separating claw having a pointed portion, a nozzle 33 shown only in FIG. A compressed air flow is discharged from the nozzle 33 at a high speed in synchronization with the conveyance of the leading edge of the paper 29 from a pump of an air pressure generator (not shown), and the paper 29 is pressed against the plate cylinder 1.
It is a well-known thing which sprays between the front-end | tip part and the outer peripheral surface of the plate cylinder 1. More specifically, for example, a third embodiment described later.
For example, compressed air from the air supply means 64 shown in FIG. 12 which operates in synchronization with the rotation of the plate cylinder 1 may be used.

The air knife 31 fixes the base portion of the air knife 31 via an air knife arm 34 and supports the air knife 31 so as to be swingable.
It is connected and fixed to 2. Both ends of the air knife shaft 32 are rotatably supported by the housing side plate pair by a predetermined angle. At the lower portion of the air knife 31, the sheet guide portion 3 having a thin plate shape and a substantially fan shape from the tip 31a to the base end side.
5 is integrally formed. The paper guide unit 35 is shown in FIG.
As shown in (b), when the air knife 31 occupies the peeling position, the paper contact surface 35a having a curved surface shape in which the front end surface of the printed paper 29 separated by the tip 31a thereof is slightly depressed. Storage member 36
It has a role of guiding and handing over the paper discharge belt 40 of the paper discharge conveying device 37 in an orderly manner without causing a jam or the like due to collision with or catching on. From this point of view, the shape of the sheet contact surface 35a of the sheet guide portion 35 is formed as described above in order to maintain the reliable peeling performance while leaving the pointed portion 31a of the air knife 31 as sharp as possible. .

The air knife 31 is, for example, the above-mentioned Japanese Patent Laid-Open No. 20.
No. 01-10195, the separating member displacing means (17a and 17) shown in FIGS.
Any one of b) (hereinafter, separation member displacement means (17a)
Will be described as a typical example), so that the tip 31a has the peeling position (separation position) about the air knife shaft 32.
And the non-separation position (non-separation position). The peeling position is preferably such that the tip 31a of the air knife 31 does not interfere with the recessed outer peripheral surface of the plate cylinder 1 when the outer peripheral surface of the press roller 15 and the outer peripheral surface of the plate cylinder 1 are pressed against each other. The plate cylinder 1 is optimal for separating and separating the leading end of the paper 29 from the outer peripheral surface of the plate cylinder 1.
The position displaced from the outer peripheral surface to the position having the minimum gap in the centrifugal direction. The non-peeling position is a position where the tip 31a of the air knife 31 is displaced to a position where it does not interfere with the outer peripheral protruding portion of the plate cylinder 1 such as the clamper 7 arrangement portion. Further, for example, the separating member retreating means (70a, 70b) disclosed in JP 2001-10195 A mentioned above.
In the case of not having such a structure, the peeling position means that the tip 31a of the air knife 31 does not interfere with the outer peripheral surface of the plate cylinder 1 and the paper is transferred from the outer peripheral surface of the plate cylinder 1. 29
A position displaced from the outer peripheral surface of the plate cylinder 1 to a position having a minimum gap in the centrifugal direction, which is optimum for peeling and separating the leading end of the plate.

The separating member displacing means (17a) includes the air knife arm 34 described above and the air knife shaft 3 described above.
2 and the support shaft 5 of the plate cylinder 1 so as to be attachable to and detachable from each other, and are driven to rotate in synchronization with the rotation of the plate cylinder 1 and between the peeling position and the non-peeling position. Point 3
Peeling cam (75) for selectively displacing 1a
And a peeling claw cam (7
5) A roller (77) that constitutes a cam follower that follows.
a) and the cam follower arm (76) that rotatably supports the roller (77a) at one free end, and the roller (77a) of the cam follower arm (76) is pressed against the contour peripheral surface of the peeling claw cam (75). The spring (78) (tensile spring) is provided as a biasing means for biasing in the direction to move.
In the technique described in JP 2001-10195 A, paragraph numbers (0025) and (0
055) to (0057), and FIGS.
Through the separation member retracting means (70a, 70b) peculiar to the technology shown in FIG. 6 to FIG. 6, the paragraph number (0
086) to (0089), the characteristic operation is performed, but in the present invention, the configuration and the operation are not the gist thereof, and thus the description thereof will be omitted.

A pressure arm (not shown) is fixed to one end of the air knife shaft 32. The pressure arm is integrally formed with a notch (not shown) capable of engaging with a locking member of an air knife locking means (not shown), and the notch is disengageable from the locking member. Has become. The air knife locking means is the air knife 3 except when the paper is being passed (when printing).
1 is a well-known device that holds 1 at the non-peeling position (strictly, a position slightly further apart than the non-peeling position) shown in FIG. 1, the air knife locking member, the support shaft, the solenoid, and the tension spring ( Both are not shown) and the like. The control means controls to operate the separating member displacing means (17a) by turning on the solenoid based on the sheet passing signal from the sheet leading edge detection sensor, that is, the air knife 31 is moved to the peeling position. Printed paper 2 from the master 8 that has been prepressed on the plate cylinder 1 by rocking and displacing
The sheet 9 is peeled off, and a paper discharging / peeling operation is performed. When in the non-printing state or when the plate cylinder 1 constitutes the plate cylinder unit and occupies the home position where it separates from the apparatus main body, the air knife 31 is held at the non-peeling position by the air knife locking means. At the same time, the sharp end 31a is retained inside the storage member 36 in a retracted state.

As shown in detail in FIG. 4, the accommodating member 36 is integrally formed to have a U-shaped cross section by bending a stainless steel thin plate or sheet metal material or an appropriate resin, for example. As shown in FIGS. 1 to 3, it is attached and fixed to a stationary member (not shown) fixedly mounted on the side plate of the housing in a state of being inclined downward to the right.
A guide groove 36 a into which the paper guide portion 35 of the air knife 31 is loosely fitted is formed in the lower bottom wall of the storage member 36.

Next, the operation of the stencil printing machine will be described. A user sets a document (not shown) on the document receiving tray of the document reading apparatus, and before and after this, a paper 29 of a paper type and a paper size to be used for printing is replenished and stacked on the paper feed tray 28 as appropriate. Next, when a plate making start key (not shown) on the operation panel (not shown) is pressed, a start signal is generated, and by inputting this to the control means, a series of operations from plate discharge to sheet discharge is automatically performed. Done. First, the plate making operation is performed in parallel with the plate discharging operation.

First, the plate cylinder 1 is rotated by rotationally driving the electric motor, and the used master 8 wound on the plate cylinder 1 is peeled off by the plate discharge device (not shown) to remove the used master 8 from the plate discharge box. To be discarded. Next, plate cylinder 1
Causes the clamper 7 to rotate to the plate feeding position, which is located substantially right beside in FIG. When the plate cylinder 1 stops at the plate feeding position, the clamper 7 is opened by the opening / closing device to enter the plate feeding standby state.

In the plate feeding standby state, one original is sent to the reading section by the operation of the original separating / conveying device (not shown) provided in the original reading device, and the image of the original is sent by the operation of the scanner (not shown). Is read as optical information, the optical information is converted into an analog electric signal by an image sensor such as a CCD (charge coupled device), and further processed through the A / D converter and the plate-making control device. By the sent digital image signal, the heating elements of the thermal head 10 are pulsed in the main scanning direction to selectively generate heat. At the same time, as the stepping motor is rotationally driven, the platen roller 9 and the conveying roller pair 12 start to rotate, and the master 8 is pulled out from the master roll 8a while the master scanning direction is orthogonal to the sub scanning direction. However, plate making is performed in which the thermoplastic resin film portion of the master 8 is selectively heated and punched according to image information while being conveyed in the master conveying direction X1.

The leading end of the master 8 is the guide plate 13
Is guided between the clampers 7 which are widened with respect to the stage 6 and the conveying roller pair 12 and the like rotate by a predetermined angle, and the stepping motor has a certain number of steps corresponding to this rotation. When it is judged that the tip of the plate-made master 8 has reached between the stage 6 and the clamper 7, the clamper 7 is closed by the opening / closing device, and the tip of the plate-made master 8 is clamped to the stage 6 and the clamper 7. It is adsorbed and held between 7 and. After clamping the front end of the plate-making master 8, the plate cylinder 1 is restarted to rotate in the direction of the arrow shown in FIG. Is a pair of transport rollers 12
And is fed to be wound around the outer peripheral surface of the plate cylinder 1.

When it is determined that the plate making to the master 8 and the conveyance of the set amount of the plate-made master 8 are completed by the rotational driving of the stepping motor by the predetermined number of steps, the cutter 11 is operated to make the plate-making master. When 8 is cut and the rotation drive of the stepping motor is stopped, the platen roller 9 and the conveying roller pair 12 stop rotating. Then, the cut rear end of the plate-making master 8 is pulled out from the plate-making device 14 by the rotation of the plate cylinder 1, and is completely wound around the outer peripheral surface of the plate cylinder 1 to make the plate on the plate cylinder 1. The winding of the completed master 8 is completed.

When the winding of the plate-making master 8 on the plate cylinder 1 is completed, the plate cylinder 1 starts to rotate in the direction of the arrow in FIG. 1 at a predetermined peripheral speed to start the paper feeding / printing process. .
It should be noted that until the leading edge of the sheet of paper 29 crosses / passes the sheet leading edge detection sensor, in other words, until the leading edge of the sheet of paper 29 is detected ON by the sheet leading edge detection sensor, the control means operates the locking means. Since the solenoid is controlled to remain off, the displacing means is in an inoperative state, whereby the press roller 15 is held in the second position, that is, the initial position separated from the outer peripheral surface of the plate cylinder 1. There is.

Next, at a predetermined timing according to the rotational position of the plate cylinder 1, the stepping motor is activated to rotate the sheet feeding roller 26 in the clockwise direction, so that the sheet feeding roller 26 is in contact with the sheet feeding roller 26. The uppermost sheet 29 on the sheet tray 28 is separated into one sheet by the cooperation of the separating member 27 while being conveyed, and is delivered toward the nip portion of the registration roller pair 17 on the downstream side in the sheet conveying direction X2. .

It is determined from the predetermined pulse number (predetermined step number) to the stepping motor that the leading edge of the sheet 29 is normally conveyed toward the nip portion of the registration roller pair 17 by the rotation of the sheet feeding roller 26. Then, the rotation of the paper feed roller 26 is stopped. Until the stepping motor is stopped, the paper 29 is held in a state in which the front end of the paper 29 comes into contact with the nip portion of the registration roller pair 17 and then a predetermined curved bend is formed at the front end of the paper 29. To be done.

Next, the plate cylinder 1 further rotates in the direction of the arrow in FIG. 1, and at the predetermined timing in accordance with the plate-making image leading end position of the plate-making master 8 on the plate cylinder 1, the registration roller pair 17 side. When the above stepping motor is activated, the leading edge of the sheet of paper 29 which is in contact with the nip portion of the registration roller pair 17 and stands by is timed by the registration roller pair 17 and the plate cylinder 1 and the press roller 15 are timed.
It is sent out between and. After that, the stepping motor on the registration roller pair 17 side is rotationally driven by a predetermined number of pulses (a predetermined number of steps) and then stops.

Then, when the leading edge of the sheet 29 is detected ON by the sheet leading edge detecting sensor within the predetermined number of pulses supplied to the stepping motor on the registration roller pair 17 side, the solenoid of the locking means. When the solenoid is turned on, the displacement means is operated. In other words, when the solenoid is turned on, the pressure arm 17 is released from its locked state and rocks clockwise around the arm shaft 16a by the urging force of the pressure spring 19. When the pressure arm 17 swings, the outer peripheral surface of the cam follower 18 contacts the contour peripheral surface of the cam 20, and the outer peripheral surface of the cam follower 18 faces the peripheral surface of the small-diameter portion of the cam 20 and is in the non-contact state. At the rotational position, the press roller arm pair 16 swings clockwise and rises around the arm shaft 16a by the urging force of the pressure spring 19.

As a result, the outer peripheral surface of the press roller 15 is displaced to the first position in which the sheet 29 is pressed against the master 8 on which the plate has been made on the plate cylinder 1, and the press roller 15 is driven to rotate. Paper 29 on master plate 8
By continuously pressing, the so-called plate-making printing for bringing the master 8 which has been plate-formed into close contact with the outer peripheral surface of the plate cylinder 1 and filling the ink into it. In this stencil printing, stencil printing is performed by the ink bleeding from the opening portion of the opening 1a of the plate cylinder 1 to the perforated portion of the master 8 that has been plate-made and transferred to the surface of the paper 29. At this time, the ink roller 2 also rotates in the same direction as the rotation direction of the plate cylinder 1. The ink in the ink reservoir 4 is attached to the surface of the ink roller 2 by the rotation of the ink roller 2, and its amount is regulated when passing through the gap between the ink roller 2 and the doctor roller 3, and the inner peripheral surface of the plate cylinder 1 Is supplied to.

At this time, when the leading edge of the sheet 29 is detected by the sheet leading edge detecting sensor, the solenoid of the air knife locking means is energized, thereby operating the separating member displacing means (17a). Will be made. That is, when the solenoid is turned on, the separating claw cam (75) of the separating member displacing means (17a) is operated together with the plate cylinder 1 at the home position (the clamper 7 When it is rotated slightly clockwise from the rotational position of the plate cylinder 1 which is located substantially right below, the small diameter portion of the separating claw cam (75) and the roller (77a) of the cam follower arm (76) face each other. As shown in FIG. 2, the cam follower arm (76), the air knife arm 34, and the air knife 31 all swing in the counterclockwise direction about the air knife shaft 32 and are stored as shown in FIG. 3 (a). Member 3
As shown in FIGS. 2 and 3 (b), the tip 31a of the air knife 31 housed in the plate 6 occupies the peeling position in the vicinity of the outer peripheral surface of the plate cylinder 1, so that the plate-making on the plate cylinder 1 is completed. The front end of the printed paper 29 is reliably peeled off from the master 8. The tip of the printed paper 29 separated by the tip 31 a of the air knife 31 is
While being in contact with the sheet contact surface 35a below the pointed edge 31a, the sheet is guided to the sheet discharge belt 40 of the sheet discharge transport device 37 along the sheet contact surface 35a.

The peeled paper 29 is delivered to the paper delivery / transport device 37.
When the sheet is discharged and stacked on the sheet discharge tray while being sucked and adsorbed on the sheet discharge belt 40 and conveyed. Although the description goes back and forth, when the plate cylinder 1 rotates in the direction of the arrow in FIG. 1 and the clamper 7 reaches the vicinity of the press roller 15 which is in pressure contact with the plate cylinder 1, it synchronizes with the rotation of the plate cylinder 1. Since the cam 20 that has been rotationally driven is rotating its large-diameter portion peripheral surface to a position in contact with the outer peripheral surface of the cam follower 18, the press roller 15 is arranged with the clamper 7 protruding outward from the outer peripheral surface of the plate cylinder 1. As a result, the press roller 15 and the clamper 7 are prevented from interfering with each other.

Similarly, when the clamper 7 reaches the vicinity of the tip 31a of the air knife 31 which occupies the peeling position, the separation claw cam (7) which has been rotationally driven in synchronization with the rotation of the plate cylinder 1.
5) has a cam follower arm (76) on the peripheral surface of the large diameter portion.
Since the roller (77a) is rotated to a position in contact with the outer peripheral surface of the roller (77a), it is separated from the clamper 7 arrangement portion of the plate cylinder 1. At the same time, the two-dot chain line in FIG.
As shown in (a), the air knife 31 swings clockwise around the air knife shaft 32, so that the paper guide portion 35 protruding downward in the air knife 31 is inserted into the guide groove 36 a of the storage member 36. Since the tip 31a of the air knife 31 is housed in the housing member 36 while being guided, interference between the tip 31a of the air knife 31 and the part of the clamper 7 can be avoided.

On the other hand, from the time when the press roller 15 comes into contact with the outer peripheral surface of the plate cylinder 1, the plate cylinder 1 makes about three quarters, and the cam 20
If the energization to the solenoid is cut off at the time point when the peripheral surface of the large diameter portion of the vehicle and the cam follower 18 come into contact with each other, that is, at the time point when the locking member and the notch of the pressure arm 17 can be locked, the above-mentioned engagement is interrupted. When the stop member is in the locked state, the press roller 15 returns to and is held at the second position (initial position) apart from the outer peripheral surface of the plate cylinder 1, and enters the print standby state. Similarly, by holding the air knife 31 at the non-peeling position, the paper guide portion 35 is held deep in the guide groove 36a of the storage member 36, and the tip 31a thereof is stored and retracted in the storage member 36. Will be retained.

After the completion of the plate-making printing, the user appropriately views the printed matter discharged to the paper discharge tray to determine whether or not the normal printing operation may be performed. When the number of prints is set with a ten key (not shown) and a print start key (not shown) on the operation panel is pressed, the same paper feeding, normal printing, and paper discharging operations as described above are sequentially performed. The number of sheets of the printed sheet 29 is not counted as a regular number of normal prints. Compared with the plate-printing operation, the normal print operation is performed depending on that the number of sheets 29 of the plate-printed as described above is not counted as a regular normal print number, and the set print speed desired by the user. The only difference is that the feeding, printing, and discharging operations are performed at different speeds.

Therefore, according to the first embodiment, the paper 2
It is not necessary to pay any particular attention to the tip 31a of the air knife 31 at the time of trouble handling when the sheet 9 is rolled up on the plate cylinder 1 or when cleaning around the press roller 15 inside the stencil printing apparatus. Further, even if the air knife 31 is accidentally touched, its tip 31a is housed in the housing member 36, so that the hand or the like is not damaged. In addition, the tip 31a of the air knife 31
Can be sharpened in the same manner as in the conventional case, so that even if the gap (lifting) between the master 8 on the plate cylinder 1 and the leading end of the paper 29 is small, it can be securely inserted between them. This makes it possible to deal with the paper 29 that is likely to be rolled up.

As described above, the first embodiment according to claims 1 and 3 of the present invention and the above-mentioned JP 2001-101A.
The essential difference from the configuration around the air knives 7a and 7b shown in FIG. 1 and FIGS. Has a storage member 36 for storing the tip 31a when the air knife 31 occupies the non-peeling position when the air knife 31 does not print. It can be said that the air knife 31 is simply provided with the paper guide portion 35 that does not hinder the movement of the front end portion including the front end surface and the front end edge of the stripped and printed paper 29.

In the above-mentioned example of the first embodiment, the air knife 31 which is capable of swinging displacement selectively occupying the peeling position and the non-peeling position around the air knife shaft 32 is fixed to the apparatus main body side. Although the storage member 36 is applied, the present invention is not limited to this, and instead of the air knife 31, for example, Japanese Patent No. 2856622 (Japanese Patent Laid-Open No. 6-2).
Japanese Laid-Open Patent Publication No. 47029) discloses a separation claw (15) as a separation member capable of oscillating displacement that selectively occupies the separation position and the non-separation position around a separation claw shaft (34). The storage member 3 fixed to the device body side
6 can be applied, and for example, Japanese Patent No. 29680.
It can also be applied to a peeling claw (6) as disclosed in Japanese Patent Publication No. 98 (Japanese Patent Laid-Open No. 5-50737). In that case,
The above-described paper guide portion 35 may be attached to the lower part of the separation claw (15) or the peeling claw (6) integrally or separately.

If the current layout of the air knife 31, the air knife arm 34, the air knife shaft 32, etc. can be changed, the following can be easily carried out. That is, the air knife shaft 32 is moved further upward than the position shown in FIG. 1 and the like, and the air knife arm 34 is extended longer than that shown in FIG. If it is fixed to the position of the guide storing member 54 as described above, the tip 31a of the air knife 31 is moved to perform an approximate linear movement (a tip with a larger radius around the air knife shaft 32 than in the first embodiment). 31a can be swung) so that the paper guide portion 35 of the air knife 31 can be removed.

(Second Embodiment) FIGS. 5 to 7 show a second embodiment. The second embodiment is different from the first embodiment in that
As shown in FIG. 5 and FIG. 6, it is different only in having a paper discharge device 45A in place of the paper discharge device 45. Paper ejection device 45
Compared to the sheet discharging device 45, A is a peeling claw 50 as a peeling member capable of advancing and retracting which selectively occupies the peeling position shown in FIG. 6 and the non-peeling position shown in FIG. 5 in place of the air knife 31.
When the peeling claw 50 occupies the peeling position at the time of printing, instead of the housing member 36, the tip 50a (hereinafter, referred to as "tip 50a") is fixed. When the protruding claw 50 occupies the non-peeling position during non-printing, the peeling claw 50 is provided between the peeling position and the non-peeling position as well as having the function / structure for accommodating the tip 50a. The main difference is that the guide storage member 54 is provided as a storage member having a configuration.

The second embodiment shows the invention according to claims 1 and 2 in, for example, FIGS. 1, 2 and 4 of Japanese Patent No. 2856622 (Japanese Patent Laid-Open No. 6-247029). To a sheet discharging device (30) having a separating claw (15) as a separating member that is swingably displaced to selectively occupy the peeling position and the non-peeling position around the separating claw shaft (34). It is applied. In short, in the second embodiment, a guide housing member 54 having a rectangular parallelepiped guide space fixed at a predetermined position on the apparatus body side is newly added in place of the separation claw (15) capable of swinging displacement described in the above publication. And the peeling claws 50 are provided to enable linear movement in the guide storage member 54.

The peeling claw 50 and the guide storing member 54 are
The vicinity of the downstream side of the printing portion (nip portion) formed by the press roller 15 coming into pressure contact with the plate-making master 8 on the plate cylinder 1 via the paper 29 (the plate cylinder 1 shown in FIGS. 5 and 6).
On the lower left side).

As shown in FIGS. 5 to 7, the peeling claw 50 is shown in FIGS. 1, 2 and 4 of the above-mentioned Japanese Patent No. 2856622 (Japanese Patent Laid-Open No. 6-247029). The separation claw (15) has a rectangular cross section similar to that of the separation claw (15) and a thin pointed tip 50a shape, and a protrusion 50b protruding downward is integrally formed. The base side of the peeling claw 50 is connected to the free end of the peeling claw arm 51 via a pin 53. In this way, the base side of the peeling claw 50 and the free end of the peeling claw arm 51 are pin-coupled by the pin 53, and the free end of the peeling claw arm 51 can move around the pin 53. The base end of the peeling claw arm 51 is
Is connected and fixed to the peeling claw arm shaft 52 that swingably supports the free end of the. Both ends of the peeling claw arm shaft 52 are rotatably supported by the pair of housing side plates by a predetermined angle.

Peeling claw arm shaft 52 and peeling claw arm 5
1 is, for example, the cam (22L), the roller (35), and the separating claw drive arm (36) shown in FIG. 1 of Japanese Patent No. 2856622 (JP-A-6-247029).
Also, a swinging mechanism including a tension coil spring (38) and the like causes the swinging motion to be synchronized with the rotation of the plate cylinder 1.

At the free end of the peeling claw arm 51, a notch (not shown) which can be engaged with the peeling claw arm locking member of the peeling claw locking means (not shown) is integrally formed. It is detachable from the locking member. Similar to the first embodiment, the peeling claw locking means holds the peeling claw 50 at the non-peeling position (strictly, a position slightly further apart from the non-peeling position) except when the paper is being passed (during printing). The peeling claw arm locking member, the support shaft, the solenoid, the tension spring (both not shown), and the like are provided. A control means (not shown) controls to operate the swing mechanism by turning on the solenoid on the basis of a sheet passing signal from the sheet leading edge detection sensor, that is, guides the peeling claw 50 to the guide storing member 54. While performing the linear movement to the peeling position, the sheet discharging / peeling operation for stripping the printed sheet 29 from the plate-making master 8 on the plate cylinder 1 is performed. In the non-printing state or when the plate cylinder 1 constitutes the plate cylinder unit and occupies the home position where it separates from the apparatus main body, the peeling claw locking means holds the peeling claw 50 at the non-peeling position. At the same time, the tip 50a is retained inside the storage member 36 in a retracted state.

As shown in detail in FIG. 7, the accommodating member 36 is made of, for example, a material having a small frictional resistance and a good abrasion resistance in relation to the material of the peeling claw 50 and has a substantially U-shaped cross section. It is integrally molded. Thereby, the storage member 3
A guide space in the shape of a rectangular parallelepiped is formed in the interior of 6 for allowing the peeling claw 50 to move linearly. Guide storage member 5
4 is attached and fixed to an immovable member (not shown) fixedly mounted on the housing side plate on the apparatus main body side in an inclined state of descending to the right as shown in FIGS. 5 and 6. A guide groove 54a for loosely fitting and positioning the convex portion 50b of the peeling claw 50 is formed on the lower bottom wall of the guide storage member 54.

The operation of the second embodiment will be described focusing on the paper discharge operation different from that of the first embodiment. When plate printing or ordinary printing similar to that of the first embodiment is performed, the leading edge of the sheet 29 is detected to be ON by the sheet leading edge detection sensor, so that the solenoid of the peeling pawl locking means is energized. The swing mechanism is operated by turning on the solenoid. That is, when the solenoid is turned on, the cam (22L) moves together with the plate cylinder 1 under the biasing force of the tension coil spring (38) to the home position of the plate cylinder 1 (the plate cylinder 1 in which the clamper 7 is located substantially directly below). A little clockwise from the rotation position) of the cam (22L) and the separation claw drive arm (3).
The roller (35) of 6) faces each other, whereby the peeling claw arm 51 swings counterclockwise about the peeling claw arm shaft 52, as shown by the chain double-dashed line in FIG. At this time, since the peeling claw 50 is connected to the free end of the peeling claw arm 51 via the pin 53, the tip 50a of the peeling claw 50 slides in the guide storage member 54.
As shown by the two-dot chain line in FIG. 6 while sliding, it is linearly guided toward the peeling position and occupies the peeling position in the vicinity of the outer peripheral surface of the plate cylinder 1. The leading end of the printed paper 29 is reliably peeled off from the completed master 8. The leading end of the printed paper 29 that has been peeled off by the tip 50a of the peeling claw 50 is guided to the paper discharge belt 40 of the paper discharge conveying device 37 along the inclined surface of the tip 50a of the peeling claw 50.

When the clamper 7 approaches the plate cylinder 1 and reaches the vicinity of the tip 50a of the peeling claw 50 which occupies the peeling position, the cam which is rotationally driven in synchronization with the rotation of the plate cylinder 1 ( 22L) rotates the large-diameter portion peripheral surface thereof to a position in contact with the outer peripheral surface of the roller (35) of the separation claw drive arm (36), so that it is separated from the clamper 7 arrangement portion of the plate cylinder 1. . At the same time, as shown by the solid line in FIG.
The peeling claw arm 51 swings clockwise around the peeling claw arm shaft 52. At this time, the peeling claw 50 has the pin 5
By being connected to the free end portion of the peeling claw arm 51 via 3, the tip 50a of the peeling claw 50 slides and slides in the guide storage member 54, as shown by the solid line in FIG. Since the tip 50a is linearly guided toward the non-peeling position and is housed in the guide housing member 54,
Interference between the tip 50a of the peeling claw 50 and the part of the clamper 7 can be avoided. Then, in the printing standby state or at the home position where the plate cylinder 1 is detached from the apparatus main body, the peeling claw 50
The pointed end 50a is stored and retracted in the guide storage member 54.

Therefore, according to the second embodiment, the paper 2
It is not necessary to pay particular attention to the tip 50a of the peeling claw 50 during trouble handling when the sheet 9 is rolled up on the plate cylinder 1 or during cleaning around the press roller 15 inside the stencil printing apparatus. Further, even if the peeling claw 50 is accidentally touched, the tip 50a of the claw 50a is not guided by the guide storage member 54.
Since it is stored inside, it will not scratch your hands. In addition, the tip 50a of the peeling claw 50 can be made thinner than in the first embodiment as in the conventional case, so that the gap between the plate-finished master 8 on the plate cylinder and the tip of the sheet 29 can be reduced. Even if the gap (lifting) is small, it can be reliably inserted between them, and it is possible to more reliably cope with the paper that is likely to be rolled up.

(Third Embodiment) FIGS. 8 to 12 show a third embodiment. The third embodiment is different from the first embodiment only in that a sheet discharge device 45B is used instead of the sheet discharge device 45 as shown in FIGS. 8 and 10. The paper discharge device 45B is different from the paper discharge device 45 in that the air knife 3
1 instead of the peeling position shown in FIGS.
And a movable peeling claw 60 as a peeling member that selectively occupies the non-peeling position shown in FIG.
Instead of the above, when the movable peeling claw 60 occupies the peeling position during printing, the tip 60a of the movable peeling claw 60 (hereinafter,
The "peeling point 60a" is projected, and the movable peeling claw 6
When 0 occupies the non-peeling position during non-printing, the movable peeling claw 60 is movably guided so as to house the tip 60a, and the movable peeling claw 60 between the peeling position and the non-peeling position. Has a guide accommodating member 61 that can be displaced in conjunction with the moving operation of the movable peeling claw 60. When the movable peeling claw 60 occupies the peeling position at the time of printing, the movable peeling claw is in a direction in which the tip 60a projects from the guide storing member 61. A direction for accommodating the tip 60a inside the guide accommodating member 61 when the air supply means 64 shown in FIG. 12 for supplying compressed air to the 60 and the movable peeling claw 60 occupy the non-peeling position during the non-printing. The main difference is that it has a spring 63 (compression spring) as a biasing means for biasing to.

Movable peeling claw 60 and guide storage member 61
Is disposed in the vicinity of the downstream side of the printing section (nip section) (lower left side of the plate cylinder 1 shown in FIGS. 8 and 10) as in the first embodiment. As shown in detail in FIGS. 9 and 11, the movable peeling claw 60 includes a tip 60 a in addition to the tip 60 a described above.
A discharge hole 60 formed near the upper part of a for discharging compressed air
b, a circular pressure wall surface 60c formed at the left end in the drawing for receiving compressed air from the air supply means 64, and a spring 63 formed at the upper part of the discharge hole 60b and accommodating the guide accommodating member 6
1. Stopper portion 60 that regulates the amount of protrusion of the tip 60a from 1
d and a convex portion 60e which is formed below the movable peeling claw 60 and which determines the position of the movable peeling claw 60 with respect to the guide storage member 61 and has a function of preventing rotation. The movable peeling claw 60 is integrally formed with the above. In the vicinity of the tip 60a of the movable peeling claw 60, that is, at the right end in the drawing of the discharge hole 60b in the movable peeling claw 60, a discharge port to which part of the compressed air from the air supply means 64 is supplied is formed.

As shown in FIGS. 9 to 11, the guide storage member 61 is integrally formed with a support shaft 62 rotatably supported between the pair of housing side plates. As shown in detail in FIGS. 9 and 11, the guide storage member 61 has a bottomed cylindrical shape capable of storing the movable peeling claw 60. The guide accommodating member 61 has a groove portion 61a formed in the lower part of the drawing, which loosely fits the convex portion 60e of the movable peeling claw 60 to allow the movable peeling claw 60 to slide, and a movable peeling claw 60 formed at the left end of the groove portion 61a. In the figure, a groove stop 61b that restricts the movement to the left, and a ventable connection port 61c that connects a tube 65 that allows compressed air from the air supply means 64 to pass therethrough,
The guide accommodating member 61 is provided with a stopper portion 61d which is formed on the upper portion thereof and cooperates with the stopper portion 60d of the movable peeling claw 60 to regulate the protruding amount of the tip 60a. The guide storage member 61 is integrally formed with the above.

As described above, the movable peeling claw 60 is made of a material having a small frictional resistance and a good wear resistance in relation to the material of the guide storage member 61. The convex portion 60e of the movable peeling claw 60 is loosely fitted and is prevented from rotating, so that the movable peeling claw 60 can slide smoothly on the cylindrical inner wall surface of the guide storage member 61 without rotating. .

The air supply means 64 is, for example, Japanese Patent No. 29680.
This is the same as that shown in FIG. 2 of Japanese Patent Publication No. 98 (Japanese Patent Laid-Open No. 5-59737). That is, the air supply means 64
Is a cylinder 66 that is connected and communicated with the connection port 61c of the guide storage member 61 and a tube 65 for air supply, and a cylinder 66 that is mounted in the cylinder 66 and that smoothly moves between the top dead center and the bottom dead center in the cylinder 66. A slidable piston 67, a link 68 whose one end is connected to the piston 67 through a pin and the other end is connected to a crank pulley 69 through a pin, and which rotates in synchronization with the plate cylinder 1 and rotationally drives it. It is mainly composed of a crank pulley 69 that transmits a force to the link 68.
The piston 67 is provided with a vent hole 67a that connects the inside and the outside of the cylinder 66, and the vent hole 67a is also provided.
A valve plate (not shown) for opening and closing is provided. As a result, a positive pressure is generated by the compressed air during the forward movement / compression stroke of the piston 67, and a negative pressure is not generated during the backward movement / return.

Movable peeling claw 60 and guide storage member 61
Is, for example, the separating member displacing means (17 shown in FIG. 1 and FIGS. 4 to 5 of JP 2001-10195 A).
a) A swing mechanism similar to that of (a) (specifically, compared with the separating member displacing means (17a) of the first embodiment, the air knife shaft 3).
2 is replaced by a spindle 62, the air knife 31 is replaced by a guide accommodating member 61 accommodating the movable peeling claw 60, the air knife arm 34 is removed, and the guide accommodating member 61 is replaced by the spindle 6
2) except that the plate cylinder 1 is fixed). That is, the control means (not shown) turns on the solenoid of the locking means, which is substantially the same as that of the first embodiment, on the basis of the sheet passing signal from the sheet leading edge detection sensor during sheet passing (at the time of printing). The rocking mechanism is controlled to operate. Specifically, the movable peeling claw 60 is guided linearly to the peeling position while guiding the movable peeling claw 60 to the guide storage member 61 by the operation described later, and the printed sheet 29 is peeled off from the plate-made master 8 on the plate cylinder 1. paper·
The peeling operation is performed. Further, the control means (not shown) controls the guide storage member 6 except when the paper is passed (when printing).
The locking means is controlled so as to hold the movable peeling claw 60 together with 1 at the non-peeling position (strictly, at a position slightly further apart than the non-peeling position).
In the non-printing state or when the plate cylinder 1 constitutes the plate cylinder unit and occupies the home position where it is separated from the apparatus main body, the movable peeling claw 60 is held at the non-peeling position by the locking means. In addition, the tip 60a is retained inside the guide storage member 61 in a retracted state.

In the third embodiment, the invention according to claims 5 and 7 is applied to a peeling claw as shown in FIGS. 1 and 2 of Japanese Patent No. 2968098 (Japanese Patent Laid-Open No. 5-59737), for example. A peeling claw (6) capable of swinging displacement so as to selectively occupy the peeling position and the non-peeling position around an axis and ejecting compressed air from the air supply means (11) at the peeling position. The present invention is applied to a paper discharge device equipped with. In short, in the third embodiment, instead of the peeling claw (6) described in the above publication, the compressed air from the air supply means 64 is discharged at the peeling position, and the third embodiment moves by the compressed air from the air supply means 64. The peeling claw 60 can be moved into the guide storage member 61.

The operation of the third embodiment will be described focusing on the paper discharge operation different from that of the first embodiment. When plate printing or normal printing similar to that of the first embodiment is performed, the leading edge of the sheet 29 is detected to be ON by the sheet leading edge detection sensor, and the operation similar to that of the first exemplary embodiment is performed. As shown by the solid line, the guide storage member 61 that stores the movable peeling claw 60 swings counterclockwise around the support shaft 62.

On the other hand, in parallel with the above operation, the air supply means 64
The crank pulley 69 is rotated in synchronization with the rotation of the plate cylinder 1, and the movement of the link 68 causes the piston 67 to start moving from its bottom dead center to top dead center.
The compressed air generated by the movement of the movable peeling claw 6 shown in FIG.
By being supplied to the pressure wall surface 60c of 0, the tip 60a of the movable peeling claw 60 is pushed and moved in a direction projecting from the inside of the guide storage member 61 against the urging force of the spring 63, and FIG.
And occupies the peeling position shown in FIG. At the same time, a part of the compressed air is discharged from the discharge port through the discharge hole 60b, so that the front end of the printed sheet 29 is reliably separated from the plate-making master 8 on the plate cylinder 1. . The tip 60a of the movable peeling claw 60 and the leading end of the printed paper 29 peeled by the compressed air are guided to the paper discharge belt 40 of the paper discharge conveying device 37.

The tip 60a of the movable peeling claw 60, in which the clamper 7 is close to the plate cylinder 1 and occupies the peeling position, is shown.
When it reaches the vicinity of, the guide storage member 61 storing the movable peeling claw 60 moves clockwise around the support shaft 62 as shown by the chain double-dashed line in FIG. By swinging, it separates from the clamper 7 arrangement part of the plate cylinder 1. At the same time, the crank pulley 69, which was rotated in synchronization with the rotation of the plate cylinder 1, positions the piston 67 at the top dead center, so that the cylinder 6
Since the pressure of the air in 6 is reduced and the tip 60a of the movable peeling claw 60 is pulled into the guide storage member 61 by the urging force of the spring 63 and occupies the non-peeling position, the tip 60a of the movable peeling claw 60 is Interference with the clamper 7 part can be avoided. Then, in the printing standby state or at the home position where the plate cylinder 1 is detached from the apparatus main body, the tip 60a of the movable peeling claw 60 is stored / retracted and held in the guide storage member 61.

Therefore, according to the third embodiment, the paper 2
It is not necessary to pay particular attention to the tip 60a of the movable peeling claw 60, for example, when the trouble of winding the sheet 9 onto the plate cylinder 1 is dealt with, or when cleaning around the press roller 15 inside the stencil printing machine. . Further, even if the movable peeling claw 60 is accidentally touched, the tip 60a is stored in the guide storage member 61, so that the hand or the like is not scratched. In addition, since it can be used in a conventional air-projecting type peeling member, the structure is simple and the cost can be reduced. Further, since it is not necessary to increase the air amount, the master 8 will not be broken by the air pressure. In this example as well, the tip 60a of the movable peeling claw 60 can be made thinner than in the first embodiment, as in the conventional case. Even if the gap (lifting) between the sheet and the sheet is small, the sheet can be reliably inserted between them, and it is possible to more reliably cope with the sheet 29 that is likely to be rolled up.

8 to 11, a swinging mechanism and a support shaft 62 similar to the separating member displacing means (17a) shown in FIGS. 1 and 4 to 5 of JP 2001-10195A, for example. And the like, and, for example, the guide storage member 61 shown in FIG. 8 is moved slightly upward and then fixed to the apparatus main body side, and the position of the tip 60a from the movable peeling claw 60 main body is reached. It is also possible to adopt a paper discharge device configuration in which the dimension of is slightly extended (see claim 6). In such a paper discharge device, the movable peeling claw 60 and the tip 60a move in the guide storage member 61 against the biasing force of the spring 63 by the compressed air from the air supply means 64 at the predetermined timing as described above. Occupy the peeling position, and at other times, the non-peeling position is occupied by the urging force of the spring 63.

(Fourth Embodiment) FIGS. 13 to 17 show a fourth embodiment. The fourth embodiment is different from the first embodiment only in that it has a paper discharge device 45C in place of the paper discharge device 45, as shown in FIGS. 13 and 15. The paper discharging device 45C is different from the paper discharging device 45 in that the peeling member selectively occupies the peeling position shown in FIGS. 15 and 16 and the non-peeling position shown in FIGS. 13 and 14 in place of the air knife 31. Has a movable peeling claw 70 as described above, and instead of the storage member 36, when the movable peeling claw 70 occupies the peeling position during printing, the tip 70a of the movable peeling claw 70 is provided.
When the movable peeling claw 70 occupies the non-peeling position during non-printing, the movable peeling claw 70 is movably guided so as to house the tip 70a, and Having a guide storage member 73 that can be displaced in association with the movement operation of the movable peeling claw 70 between the peeling position and the non-peeling position, when the movable peeling claw 70 occupies the peeling position during the printing. , The movable peeling claw 70 in the direction in which the tip 70a is projected from the guide storage member 73.
When the air supply means 64 shown in FIG. 12 and the movable peeling claw 70 occupy the non-peeling position during the non-printing, which is similar to the third embodiment for supplying compressed air to the guide storage member 7,
3 mainly has a biasing means (for example, a compression spring 63 similar to that of the third embodiment) that biases the tip 70a in a direction to store the tip 70a.

Compared to the first embodiment, the fourth embodiment is different from the first embodiment in that the storage member 36 fixed to the apparatus main body side.
Guide storage member 7 (in which the movable peeling claw 70 is stored)
3 can be regarded as configured to be displaceable in association with the displacement operation of the movable peeling claw 70 between the peeling position and the non-peeling position (see claim 3). In addition, Embodiment 4
Compared with the third embodiment, the guide storage member 61 has a structure in which the guide storage member 73 is fixed to the arm shaft 72 via the arm 71, instead of the structure in which the guide storage member 61 is directly fixed to the support shaft 62. It can be seen that there are mainly differences.

Movable peeling claw 70 and guide storage member 73
Is in the vicinity of the downstream side of the printing section (nip section) as in Embodiments 1 and 3 (on the lower left side of the plate cylinder 1 shown in FIGS. 13 and 15).
It is installed in. The movable peeling claw 70 is shown in FIGS.
As shown in detail in FIG. 17 and FIG.
In addition, a discharge hole 70b formed near the top of the tip 70a for discharging compressed air, and a discharge hole 70b formed at the left end in the figure.
The movable peeling claw 70 for the guide accommodating member 73, which is formed to project below the circular pressure wall surface 70c that receives the compressed air from the air supply means 64 and the tip 70a of the movable peeling claw 70 shown in FIG.
And a stopper screw 74 for restricting the amount of protrusion of the tip 70a from the guide housing member 73 formed in the upper portion of the discharge hole 70b. Female screw portion 70e for
And a spring accommodating portion for accommodating a spring (not shown) that is formed above the discharge hole 70b and biases the movable peeling claw 70 in the direction to move to the left side in the drawing. The movable peeling claw 70 is integrally formed with the above. In the vicinity of the tip 70a of the movable peeling claw 70, that is, the movable peeling claw 70
A discharge port to which a part of the compressed air from the air supply unit 64 is supplied is formed at the right end of the discharge hole 70b in FIG.

The guide accommodating member 73 is shown in FIGS.
As shown in FIG. 5, the base of the movable peeling claw 70 is fixed via an arm 71, and is connected and fixed to an arm shaft 72 that swingably supports the movable peeling claw 70. Both ends of the arm shaft 72 are rotatably supported by the housing side plate pair by a predetermined angle. The guide storage member 73 is shown in FIGS.
As shown in detail in FIG. 6 and FIG. 17, it has a bottomed cylindrical shape capable of accommodating the movable peeling claw 70. Guide storage member 73
Is a groove portion 73a formed in the lower part of the figure for loosely fitting the guided portion 70d of the movable peeling claw 70 to allow the movable peeling claw 70 to slide, and the left part of the figure of the movable peeling claw 70 formed in the upper part of the figure. Groove 73b for restricting the movement in the direction and a stopper screw 74 screwed to the movable peeling claw 70 in cooperation with a groove 73b having a stopper 73e for restricting the protruding amount of the tip 70a, and an air supply means 64. A ventable connection port 73 for connecting a tube 65 through which compressed air from
It has c and the like. The guide storage member 73 is integrally formed with the above.

As described above, the movable peeling claw 70 is made of a material having a small friction resistance and a good wear resistance in relation to the material of the guide storage member 73, and the movable peeling claw 70 and the groove portion 73a of the guide storage member 73. Since the guided portion 70d is loosely fitted and prevented from rotating, it can slide smoothly on the cylindrical inner wall surface of the guide storage member 73 without rotating.

Movable peeling claw 70 and guide storage member 73
Similar to the third embodiment, for example, the above-mentioned Japanese Patent Laid-Open No. 2001-1
The swinging mechanism similar to the separating member displacing means (17a) shown in FIGS. 1 and 4 to 5 of FIG. 19 (specifically, as compared with the separating member displacing means (17a) of the first embodiment, An arm shaft 72 is used instead of the air knife shaft 32, a guide storage member 73 that stores the movable peeling claw 70 is used instead of the air knife 31, and an arm 71 is fixed to the arm shaft 72 instead of the air knife arm 34. (Due to the difference), the plate cylinder 1 swings in synchronization with the rotation of the plate cylinder 1. That is,
The control means (not shown) turns on the solenoid by turning on the solenoid of the locking means substantially similar to that of the first embodiment based on a paper passing signal from the paper leading edge detection sensor during paper passing (printing). Control to activate the mechanism. Specifically, the movable peeling claw 70 is guided linearly to the peeling position while guiding the movable peeling claw 70 to the guide storage member 73 by an operation described later, and the printed sheet 2 is printed from the plate-making master 8 on the plate cylinder 1.
The sheet 9 is peeled off, and a paper discharging / peeling operation is performed. Further, the control means (not shown) moves the movable peeling claw 70 together with the guide storage member 73 at the non-peeling position (strictly, a position slightly further apart from the non-peeling position) together with the guide storage member 73 except when the paper is passed (when printing). The locking means is controlled so as to hold it. In the non-printing state or when the plate cylinder 1 constitutes the plate cylinder unit and occupies the home position where it is separated from the apparatus body, the movable peeling claw 70 is held at the non-peeling position by the locking means. In addition, the tip 70a is retained inside the guide storage member 73 in a retracted state.

The fourth embodiment relates to the invention according to claim 1 and claim 4, for example, as shown in FIGS. 1 and 2 of Japanese Patent No. 2968098 (JP-A-5-59737). A peeling claw (6) capable of swinging displacement so as to selectively occupy the peeling position and the non-peeling position around an axis and ejecting compressed air from the air supply means (11) at the peeling position. The present invention is applied to a paper discharge device equipped with. In short, in the fourth embodiment, instead of the peeling claw (6) described in the above publication, the compressed air from the air supply means 64 is ejected at the peeling position, and the movable air is moved by the compressed air from the air supply means 64. The peeling claw 70 is movable in the guide storage member 73.

The operation of the fourth embodiment will be described focusing on the paper discharge operation different from that of the first embodiment. When plate printing or normal printing similar to that of the first embodiment is performed, the leading edge of the sheet 29 is detected to be ON by the sheet leading edge detection sensor, and the operation similar to that of the first exemplary embodiment is performed. As shown by the solid line, the guide housing member 73 housing the movable peeling claw 70 swings counterclockwise around the arm shaft 72.

On the other hand, in parallel with the above operation, the crank pulley 69 of the air supply means 64 shown in FIG. 12 is rotated in synchronization with the rotation of the plate cylinder 1, and the movement of the link 68 causes the piston 67 to bottom dead. Starting from the point toward the top dead center, the compressed air generated by the movement of the piston 67 is sent from the cylinder 66 through the tube 65 and supplied to the pressure wall surface 70c of the movable peeling claw 70 shown in FIG. As a result, the tip 70a of the movable peeling claw 70 is pushed and moved in a direction projecting from the inside of the guide storage member 73 against the biasing force of a spring (not shown), and occupies the peeling position shown in FIGS. 15 and 16. At the same time, a part of the compressed air is discharged from the discharge port through the discharge hole 70b, so that the front end of the printed sheet 29 is surely peeled from the plate-making master 8 on the plate cylinder 1. The leading end of the printed paper 29 peeled off by the tip 70 a of the movable peeling claw 70 is guided to the paper discharge belt 40 of the paper discharge conveying device 37.

The tip 70a of the movable peeling claw 70 in which the clamper 7 is close to the plate cylinder 1 and occupies the peeling position.
13A and 13B, the guide accommodating member 73 accommodating the movable peeling claw 70 moves clockwise around the arm shaft 72 through the same operation as that of the first embodiment, as shown by the chain double-dashed line in FIG. By swinging, it separates from the clamper 7 arrangement part of the plate cylinder 1. At the same time, the crank pulley 69 that has been rotating in synchronization with the rotation of the plate cylinder 1 positions the piston 67 at the top dead center, so that the pressure of the air in the cylinder 66 decreases and the spring The tip 70a of the movable peeling claw 70 is guided by the biasing force of the guide accommodating member 7
Since the non-peeling position is drawn into the inside of 3 and interference with the tip 70a of the movable peeling claw 70 and the clamper 7 site is avoided.

At the printing standby state or at the home position where the plate cylinder 1 is detached from the apparatus main body, the tip 70a of the movable peeling claw 70 is stored / retracted in the guide storage member 73. Therefore, according to the fourth embodiment, the same advantages as those of the third embodiment can be obtained.

In the third and fourth embodiments, the spring 63 as the urging means is provided between the movable peeling claw 60 and the guide storage member 61 or between the movable peeling claw 70 and the guide storage member 73 as described above. However, the present invention is not limited to this, and for example, in the fourth embodiment, a tension spring may be provided outside between the stopper screw 74 and the guide storage member 73 on the left side in the drawing. Good. In the third and fourth embodiments,
By providing the ventilation hole 67a of the piston 67 and the valve plate (not shown) in the air supply means 64, negative pressure is not generated when the piston 67 moves back and forth. For example, the ventilation hole 67a and the valve plate described above are not generated. It is also possible to remove and devise so that the tips 60a, 70a of the movable peeling claws 60, 70 may be returned toward the non-peeling position by the negative pressure when the piston 67 is moved back and forth. Further, when the movable peeling claws 60 and 70 occupy the non-peeling position, the space between the bottom wall surface and the pressure wall surface 60c of the guide storage member 61 as shown in FIG. 9 and the guide as shown in FIG. Storage member 73
There is no need to provide a space between the bottomed wall surface and the pressure wall surface 70c.

13 to 16, a swinging mechanism and an arm shaft 72 similar to the separating member displacing means (17a) shown in FIGS. 1 and 4 to 5 of JP 2001-10195 A, for example, are used. The arm 71 and the like are removed, and, for example, the position of the guide storage member 73 shown in FIG. 13 is moved slightly upward and then fixed to the apparatus main body side, and the tip 70a from the movable peeling claw 70 main body. The sheet discharge device configuration may be such that the dimension up to the position is slightly extended. In such a paper discharge device, the movable peeling claw 70 and the tip 70a move in the guide storage member 73 against the biasing force of the spring by the compressed air from the air supply means 64 at the above-described predetermined timing. Occupy the peeling position, and at other times, the non-peeling position is occupied by the urging force of the spring.

(Fifth Embodiment) FIG. 18 shows a fifth embodiment. Compared with the second embodiment, the fifth embodiment is similar to FIG.
As shown in FIG.
The only difference is having. Compared to the paper discharging device 45A, the paper discharging device 45D replaces the peeling claw 50 with L in front view.
Having a peeling claw 50A bent in a letter shape, a swinging mechanism as shown in FIGS. 1, 2 and 4 of Japanese Patent No. 2856622 (JP-A-6-247029), the peeling claw described above. The locking means, the peeling claw arm shaft 52 and the peeling claw arm 51 shown in FIGS. 5 and 6 are removed, and a driving means (driving source) for driving the peeling claw 50A in synchronization with the rotation of the plate cylinder 1. The main difference is that the solenoid 76 is provided and the plate cylinder rotation position sensor (not shown) that generates a signal for turning on / off the solenoid 76 is provided.

The solenoid 76 is a pull type and is fixed to the upper surface of the guide housing member 54. Solenoid 76
Between the apparatus main body on the opposite side and the base side of the peeling claw 50A, the peeling claw 50A is always urged in a direction in which the peeling claw 50A moves diagonally upward to the left in the figure, that is, the peeling claw 50A always occupies the non-peeling position. Tension spring 7 as a biasing means for
7 is stretched.

The plate cylinder rotation position sensor detects that the plate-making master 8 on the plate cylinder 1 has passed when the position of the clamper 7 on the plate cylinder 1 has passed the position facing the press roller 15.
It is an example of a plate cylinder rotational position detection means for detecting the optimum rotational position of the plate cylinder 1 for peeling off the front end of the printed paper 29 from. An end plate (not shown) on the back side of the plate cylinder 1 in FIG. 18 is provided with a light shielding plate (not shown) provided so as to project further to the back side from the end plate. The plate cylinder rotation position sensor is a transmission type optical sensor that generates an ON signal by selectively engaging with the light shielding plate, and is fixed to the apparatus main body side.

The operation of the fifth embodiment will be described focusing on the paper discharge operation different from that of the second embodiment. When plate printing or normal printing similar to that in the second embodiment is performed, the leading edge of the sheet 29 is detected by the sheet leading edge detection sensor, and the solenoid is activated based on the ON signal from the plate cylinder rotation position sensor. When the solenoid 76 is energized, the solenoid 76 is turned on. As a result, the plunger 76a of the solenoid 76 is pulled diagonally downward to the right as shown in FIG. 18 against the urging force of the tension spring 77, so that the peeling claw 50A connected through the pin.
And its tip 50a slides inside the guide storage member 54.
While sliding, it is linearly guided to the peeling position and occupies the peeling position in the vicinity of the outer peripheral surface of the plate cylinder 1. As a result, the leading end of the printed sheet 29 is reliably peeled off from the plate-making master 8 on the plate cylinder 1. The front end portion of the printed paper 29 peeled off by the tip 50a of the peeling claw 50A has a discharge belt 40 of the paper discharge conveyance device 37.
Will be guided to.

From the time when the ON signal is generated from the plate cylinder rotational position sensor to the time when the plate cylinder 1 rotates by a predetermined rotation angle,
When the solenoid 76 is turned off, the tension spring 77
The tip 50a of the peeling claw 50A is linearly guided toward the non-peeling position while being slidably contacted and slid in the guide storage member 54 by the biasing force of, and is held at the non-peeling position. As described above, the fifth embodiment is also the second embodiment.
The same advantages as can be obtained, but the driving means (driving source), etc.
It goes without saying that not only the solenoid 76, but also an electric motor or the like can be used by combining appropriate mechanisms.

[0109]

As described above, according to the present invention,
A new printing apparatus can be provided by solving the problems of the conventional printing apparatus as described above. The effects of each claim are as follows. Claims 1 to 4
According to the invention described, when the peeling member occupies the peeling position at the time of printing, the tip of the peeling member is projected, and when the peeling member occupies the non-peeling position at the time of non-printing, the storage for storing the tip of the peeling member. Since the member is configured to have a member, particularly when the trouble such as winding up is performed or when the inside of the printing apparatus is cleaned, or when the plate cylinder is attached or detached for cleaning or maintenance, the tip portion including the tip of the peeling member is particularly preferable. You don't have to pay attention. Further, even if the peeling member is accidentally brought into contact with the peeling member, the tip of the peeling member is stored in the storage member, so that the hand or the like is not damaged. in addition,
Since the tip of the peeling member can be sharpened as in the conventional case, even if there is a small gap (lifting) between the plate-finished master on the plate cylinder and the leading edge of the paper, the peeling member can be surely placed between them. Since the front end can be inserted, it is possible to reliably deal with paper that easily rolls up.

According to the fifth and seventh aspects of the invention, when the peeling member occupies the peeling position during printing, the tip of the peeling member is projected, and when the peeling member occupies the non-peeling position during non-printing, The peeling member is movably guided so as to accommodate the tip of the peeling member, and the guide accommodating member that can be displaced in association with the displacement operation of the peeling member between the peeling position and the non-peeling position and the peeling member are printed. When the peeling position is occupied, the air supply means for supplying air to the peeling member in the direction in which the tip of the peeling member is projected from the guide storage member, and the guide when the peeling member occupies the non-peeling position during non-printing Since the storage member has a biasing means for biasing the tip of the peeling member in a direction to store the tip of the peeling member, it is possible to deal with troubles such as curling up, cleaning the inside of the printing apparatus, or cleaning or maintenance. In such when attaching and detaching the plate cylinder at the inspection or the like, it is not necessary pay particular attention to the distal end portion including the tip of the peeling member. Further, even if the peeling member is accidentally brought into contact with the peeling member, the tip of the peeling member is stored in the storage member, so that the hand or the like is not damaged. Also, since the tip of the peeling member can be sharpened as in the conventional case, even if there is a small gap (lifting) between the master on the plate cylinder and the tip of the paper, it is possible to reliably peel between them. It becomes possible to insert the leading end of the member, and it is possible to reliably deal with paper that easily rolls up. in addition,
Since it can be used for a conventional air protruding type peeling member, it can be supplied at a low cost with a simple structure.
Furthermore, since it is not necessary to increase the amount of air, the master will not be broken by the air pressure.

According to the sixth and seventh aspects of the invention, when the peeling member occupies the peeling position during printing, the tip of the peeling member is projected, and when the peeling member occupies the non-peeling position during non-printing, A guide accommodating member fixed to the main body of the apparatus for movably guiding the peeling member so as to accommodate the tip of the peeling member, and a peeling member from the guide accommodating member when the peeling member occupies the peeling position during printing. An air supply unit that supplies air to the peeling member in a direction in which the tip is projected, and when the peeling member occupies the non-peeling position during non-printing, urges the tip of the peeling member to be housed inside the guide housing member. Since it is configured to have a biasing means to operate, when handling troubles such as winding up or cleaning the inside of the printing apparatus,
Alternatively, for example, when the plate cylinder is attached or detached for cleaning or maintenance, it is not necessary to pay particular attention to the tip portion including the tip of the peeling member. Further, even if the peeling member is accidentally brought into contact with the peeling member, the tip of the peeling member is stored in the storage member, so that the hand or the like is not damaged. Also, since the tip of the peeling member can be sharpened as in the conventional case, even if there is a small gap (lifting) between the master on the plate cylinder and the tip of the paper, it is possible to reliably peel between them. It becomes possible to insert the leading end of the member, and it is possible to reliably deal with paper that easily rolls up. In addition, since it can be used in a conventional air-projecting type peeling member, the structure is simple and the cost can be reduced. Furthermore, since it is not necessary to increase the amount of air, the master will not be broken by the air pressure.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a main part of a stencil printing apparatus showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of an essential part showing a state where an air knife occupies a peeling position and performs a peeling operation or the like during printing of the first embodiment.

3A is a state where the air knife occupies the non-peeling position during non-printing of the first embodiment, and FIG. 3B is a state where the air knife occupies the non-peeling position during printing of the first embodiment. It is an enlarged front view of the essential part showing a state.

FIG. 4 is an exploded perspective view of a main part for explaining a shape relationship between a storage member and an air knife in the first embodiment.

FIG. 5 is a partial cross-sectional front view of a main part showing a state in which a peeling claw occupies a non-peeling position during non-printing of the second embodiment.

FIG. 6 is a partial cross-sectional front view of a main part showing a state in which a peeling claw occupies a peeling position during printing according to the second embodiment.

7 is an enlarged cross-sectional view taken along the line S7-S7 in FIG.

FIG. 8 is a partial cross-sectional front view of an essential part showing a state in which a tip of a movable peeling claw is stored in a guide storing member and occupies a non-peeling position in non-printing of the third embodiment.

9 is an enlarged cross-sectional front view of the main part of FIG.

FIG. 10 is a partial cross-sectional front view of the main part showing a state in which the tip of the movable peeling claw projects from the guide storage member and occupies the peeling position during printing according to the third embodiment.

11 is a cross-sectional front view showing an enlarged main part of FIG.

FIG. 12 is a front view of a main part showing a configuration example of an air supply unit.

FIG. 13 is a partial cross-sectional front view of an essential part showing a state in which a tip of a movable peeling claw is housed in a guide housing member and occupies a non-peeling position during non-printing according to the fourth embodiment.

FIG. 14 is a sectional front view showing an enlarged main part of FIG.

FIG. 15 is a partial cross-sectional front view of the main part showing a state in which the tip of the movable peeling claw projects from the guide storage member and occupies the peeling position during printing in the fourth embodiment.

16 is a sectional front view showing an enlarged main part of FIG.

FIG. 17 is an exploded perspective view of a main part for explaining the shape relationship between the guide storage member and the movable peeling claw in the fourth embodiment.

FIG. 18 is a partial cross-sectional front view of the main part showing a state in which the tip of the peeling claw projects from the guide housing member and occupies the peeling position during printing in the fifth embodiment.

[Explanation of symbols]

1 plate body 2 Ink roller 7 clamper 8 master 15 Press roller as pressing means 29 sheets 30 paper feeder 31 Air knife as peeling member 31a Air knife tip 33 nozzles 36 Storage member 37 Paper discharge transport device 40 paper ejection belt 45, 45A, 45B, 45C, 45D Paper discharge device 50,50A Stripping claw as stripping member 50a Tip of peeling claw 54 Guide storage member as storage member 60 Movable peeling claw as peeling member 60a Tip of movable peeling claw 61 Guide storage member 63 Spring as biasing means 64 Air supply means 70 Movable peeling claw as peeling member 70a Tip of movable peeling claw 73 Guide storage member 76 solenoid 77 Extension spring X2 Paper transport direction

Claims (7)

[Claims] 1. A plate cylinder around which a master made by plate making is wound, a pressing means for relatively pressing the paper against the master on the plate cylinder, and a front end of the plate cylinder being close to the outer peripheral surface of the plate cylinder. In a printing device comprising a peeling member for selectively peeling off a peeling position and a non-peeling position separated from the peeling position, when the peeling member occupies the peeling position during printing, the tip is projected. A printing apparatus, comprising: a storage member that stores the leading end when the peeling member occupies the non-peeling position during non-printing. 2. The printing apparatus according to claim 1, wherein the storage member has a function of guiding the peeling member between the peeling position and the non-peeling position. 3. The printing apparatus according to claim 1, wherein the storage member is fixed to the apparatus main body side. 4. The printing apparatus according to claim 1, wherein the storage member is displaceable in association with a displacement operation of the peeling member between the peeling position and the non-peeling position. Characteristic printing device. 5. A plate cylinder around which a master made by plate making is wound, a pressing means for relatively pressing the paper against the master on the plate cylinder, and a front end of the plate cylinder being close to the outer peripheral surface of the plate cylinder. In a printing device comprising a peeling member for selectively peeling off a peeling position and a non-peeling position separated from the peeling position, when the peeling member occupies the peeling position during printing, the tip is projected. When the peeling member occupies the non-peeling position during non-printing, the peeling member is movably guided so as to accommodate the tip, and the peeling is performed between the peeling position and the non-peeling position. When the peeling member occupies the peeling position at the time of printing, the guide accommodating member that can be displaced in association with the displacement operation of the member, and air is applied to the peeling member in a direction in which the tip is projected from the guide accommodating member. Companion And an urging means for urging the peeling member in the direction in which the tip is housed inside the guide housing member when the peeling member occupies the non-peeling position during the non-printing. Characteristic printing device. 6. A plate cylinder around which a master made by plate making is wound, a pressing means for relatively pressing the paper against the master on the plate cylinder, and the leading end of the plate cylinder comes close to the outer peripheral surface of the plate cylinder. In a printing device comprising a peeling member for selectively peeling off a peeling position and a non-peeling position separated from the peeling position, when the peeling member occupies the peeling position during printing, the tip is projected. A guide accommodating member fixed to the main body of the apparatus, which guides the peeling member movably so as to accommodate the tip when the peeling member occupies the non-peeling position during non-printing; Means for supplying air to the peeling member in a direction in which the tip is projected from the guide storage member when the occupying the peeling position during the printing, and the peeling member when the non-printing is performed. When accounting for peeling position, the printing apparatus characterized by having a biasing means for biasing in a direction in which is housed the front end inside said guide housing member. 7. The printing apparatus according to claim 5, wherein when the peeling member occupies the peeling position during the printing, a discharge port to which a part of the air from the air supply means is supplied, A printing apparatus provided on the peeling member near the tip.