JPH0619224A - Planographic plate making device - Google Patents

Abstract

PURPOSE:To provide a planographic plate making device capable of making a planographic printing plate without degrading the quality of a print. CONSTITUTION:The first supporting base 430 of rotary cutting devices 422 and 424 is freely movably supported in an axial direction with a spline axis 418. On the first supporting base 430, a second supporting base 440 is freely rotatably supported. On the second supporting base 440, side edge part guiding rollers 448-454 abutted on the side edge part 15 of a direct printing plate 14 to keep a relative position to a carbide cutter constant are provided. On the other hand, the first supporting base 430 and the second supporting base 440 are energized by tension coil springs, respectively, and the side edge part guiding rollers 448-454 can press the side edge part 15. Chamfering is always executed with a prescribed dimension, toner stuck to the side edge part is removed, and even if ink is stuck to the toner of the side edge part at the time of printing, the ink of the side edge part is hardly stuck to the print.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithographic printing apparatus which develops a lithographic printing plate with a liquid developer and then fixes and elutes it.

[0002]

2. Description of the Related Art Conventionally, there is a planographic printing apparatus for developing a planographic printing plate with a liquid developer and fixing and eluting the planographic plate after development processing. In this type of planographic printing apparatus, a planographic printing plate is developed with a liquid developer composed of toner particles and a carrier liquid in a development processing section. In this developing step, the toner particles adhere to the image portion of the lithographic printing plate to visualize the electrostatic latent image.
The developed lithographic printing plate is heated in the fixing processing section so that the toner particles are melted and fixed to the lithographic printing plate. The lithographic printing plate that has undergone the fixing process elutes the non-image area in the next elution processing section.

By the way, in this type of planographic printing apparatus, the surplus liquid developer adhering to the non-image portion of the planographic printing plate is blown off by the air blown from the blower after the development processing. The liquid developer adhering to the side end portion of may not be completely blown off by the air from the blower. The toner used in the lithographic printing machine is oleophilic so that the ink easily sticks during printing, so if you print with a lithographic printing plate with toner on the side edges, the ink will not be the toner image. Instead, it also adheres to the toner adhered to the side edges. Further, in the reversal developing method, the amount of toner attached to the side end portion is particularly large. Therefore, when printing on a sheet that is larger than the printing plate, such as newspaper printing, the ink adhering to the toner at the side edges is transferred to the printed matter, resulting in linear smearing, which reduces print quality. Occurs.

In order to solve the above-mentioned drawbacks, a method of forming a water-soluble polymer layer on the side edge of the lithographic printing plate and removing the water-soluble polymer layer together with the toner in the elution-treated portion (Japanese Patent Laid-Open No. 2-62654). Issue).

However, in the method of forming the water-soluble polymer layer on the side surface of the printing plate, the work is complicated because the water-soluble polymer material is applied. In addition, when the water-soluble polymer material is applied, the water-soluble polymer material may ooze out to the surface of the photoconductor layer of the printing plate. There is a risk of poor development.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention provides a lithographic printing apparatus capable of making a lithographic printing plate that does not deteriorate the quality of printed matter without complicating the work. Is the purpose.

[0007]

The invention according to claim 1 is
A lithographic printing apparatus that develops a lithographic printing plate with a liquid developer, then performs fixing and elution processing, and is provided on the downstream side of the fixing processing unit in the lithographic printing plate transport direction, and intersects the lithographic printing plate transport direction. Direction side and a chamfering means for chamfering a corner on the image forming surface side, and at least two points of the side end of the lithographic printing plate connected to the chamfering means or abutting for a predetermined length to contact the side end. A first guide that maintains a constant relative position to the chamfering means, and a first guide that is connected to the first guide and rotatably supports the first guide around a predetermined rotation axis, and is in contact with and separated from the side end portion. It is characterized by comprising guide support means for movably supporting the direction, and biasing means for biasing the first guide to the side end portion.

According to a second aspect of the present invention, in the planographic printing apparatus according to the first aspect, it occurs when the planographic printing plate is chamfered on the image forming surface side of the planographic printing plate and near the chamfering means. It is characterized in that a suction port of suction means for sucking the chamfered waste is provided.

According to a third aspect of the invention, in the planographic forming apparatus according to the first or second aspect, the guide means is moved in a direction in which the guide means is brought into contact with and separated from the side end portion, and the chamfering means is moved. The moving means to be brought into contact with and separated from the side end portion and the predetermined dimension from both end portions in the transport direction of the lithographic printing plate have the chamfering means spaced from the side end portion, and the predetermined range of the intermediate portion in the transport direction of the lithographic printing plate is Control means for controlling the operation of the moving means so that the chamfering means is brought into contact with the side end portion to chamfer the side end portion.

[0010]

According to the planographic printing apparatus of the invention described in claim 1,
When the lithographic printing plate after fixing is conveyed, the chamfering means chamfers the corners of the image forming surface on the side intersecting the conveying direction of the lithographic printing plate and adheres to the corners of the side edges. The removed toner is removed.

In this planographic printing apparatus, the chamfering means abuts at least two points on the side edge of the planographic printing plate or for a predetermined length to keep the relative position of the side edge and the chamfering means constant.
The first guide is connected to a guide, and the first guide is connected to a guide support means that supports the first guide so as to be rotatable about a predetermined rotation axis and is movable in a direction in which the side end is moved toward and away from the side end. The first guide is biased toward the side end by the biasing means.

Therefore, even if there is a dimensional error in the planographic printing plate, the planographic printing plate is displaced in the direction intersecting the conveying direction, or the side end portion is inclined with respect to the conveying direction, it is applied by the biasing means. The urged first guide rotates about a predetermined rotation axis, moves in a direction of coming close to and away from the side end, and comes into contact with at least two points or a predetermined length of the side end to be chamfered with the side end. Keep the relative position to and constant. For this reason,
The chamfering means can chamfer the corner portion on the image forming surface side with a constant size.

When printing is performed using the lithographic printing plate thus chamfered, even if the ink adheres to the toner adhering to the side edges, the ink adhering to the toner at the side edges will be chamfered. It does not come into contact with printed matter because it goes through. Therefore, a high-quality printed matter can be obtained by using the planographic printing plate produced by the planographic printing apparatus of the present invention.

Further, since the entire side edges are not cut, the dimensions (width and length) of the lithographic printing plate do not change, and positioning can be performed with reference to the side edges of the lithographic printing plate. .

Further, according to the lithographic printing apparatus of the second aspect of the invention, chamfering scraps generated when chamfering the lithographic printing plate are sucked on the image forming surface side of the lithographic printing plate and in the vicinity of the chamfering means. Since the suction duct is provided, the chamfer debris can be surely sucked and removed, and the chamfer debris does not adhere to the image forming surface. Therefore, the chamfered planographic printing plate can maintain a high-quality image forming surface without introducing chamfered scraps, which poses a quality problem, to the subsequent processing steps.

Further, according to the invention of claim 3, in the planographic forming apparatus of claim 1 or 2, the chamfering means is provided by moving the guide means in a direction of approaching and separating from the side end portion. The moving means to be brought into contact with and separated from the side end portion and the chamfering means are separated from the side end portions by a predetermined dimension from both end portions in the conveying direction of the lithographic printing plate, and the predetermined range of the intermediate portion in the conveying direction of the lithographic printing plate is the chamfering means by the side. Since the control means for controlling the operation of the moving means so as to be in contact with the end portion and chamfer the side end portion is provided, chamfering is not performed to a predetermined size from both end portions in the transport direction of the planographic printing plate. Therefore, the four corners of the lithographic printing plate are not made to have sharp angles, and the risk of injury or the like can be prevented in the subsequent work.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the direct printing plate 14 as a lithographic printing plate used in this embodiment is a thin plate electrophotographic printing plate, and a photoconductive photosensitive layer is formed on one surface of the conductive support 28. The image forming surface 30 is formed. The conductive support 28 is made of an aluminum material and has a thickness of about 0.3 mm. In addition, the conductive support 28
Is subjected to a hydrophilic treatment on the interface with the photoconductive photosensitive layer 30. In addition, as the photoconductive photosensitive layer 30, for example,
An organic photoconductive photoreceptor is used.

As shown in FIG. 3, in the electrophotographic plate making apparatus 10 as the lithographic plate making apparatus to which the present invention is applied, the drawing section 16 is arranged on the upstream side of the direct printing plate 14 in the conveying direction, and the drawing is performed. In the direction of arrow B in FIG.
2 are provided. In the direction of the arrow A in FIG. 3 of the plate discharge unit 12, the developing and fixing processing unit 18, the elution processing unit 22, the standby unit 11
8 are arranged in order, and in the direction opposite to the direction of arrow B in FIG.
6 are provided.

(Drawing unit 16) As shown in FIG. 4, the drawing unit 16 is provided with a carrying table 32 on which the direct printing plate 14 is placed, and this carrying table 32 is shown in FIG. It can move in the direction of arrow A and in the direction opposite to the direction of arrow A. The direct printing plate 14 is placed on the carrier 32 along the direction of the arrow A and the direction opposite to the direction of the arrow A (see FIG. 3).

Direct printing plate 1 is provided on the upper side of drawing unit 16 in the direction of arrow A in FIG.
Charger 3 for positively charging the photoconductive photosensitive layer 30 of No. 4
4 is provided, and an exposure unit 36 is arranged on the side of the charger 34 in the direction of arrow A in FIG. The exposure section 36 is provided with a semiconductor laser (not shown), and a laser beam is applied to the image section of the photoconductive photosensitive layer 30 after charging to scan and expose the image. The drawing unit 16 is provided with a holding claw (not shown) that discharges the exposed direct printing plate 14 to the plate discharging unit 12.

(Plate Discharging Section 12) As shown in FIG. 3, the plate discharging section 12 is provided with a conveyor device (not shown).
The exposed direct printing plate 14 is conveyed to the developing and fixing processing section 18 in the direction of arrow A in FIG.

(Developing and Fixing Processing Section 18) Developing and Fixing Processing Section 1
8 is provided with a belt conveyor 126 (not shown in FIG. 3) that conveys the direct printing plate 14 in the direction of arrow A in FIG. The developing unit 38, the squeeze unit 40, the drying unit 42, the fixing unit 44, the rotary cutting processing unit 120, and the water cooling unit 300 as a water washing unit are sequentially arranged from the upstream side in the transport direction (the side opposite to the arrow A direction in FIG. 3). Has been done. The belt of the belt conveyor 126 is made of an insulating material so that the charged direct printing plate 14 does not escape.

The developing section 38 is a direct printing plate 1 after exposure.
A liquid developer is applied to 4 to make the electrostatic latent image of the direct printing plate 14 visible. The liquid developer used here is generally dispersible in a pigment such as carbon black, polarity controllability,
Toner 19 adsorbing a resin that imparts characteristics such as fixability
Particles are dispersed in a carrier liquid. The development in the developing unit 38 is performed by reversal development, and the positively charged direct printing plate 14 is developed with toner having a positive charge. Further, the portion of the direct printing plate 14 to which the toner 19 is attached becomes lipophilic.

The squeeze section 40 is provided with a blower (not shown), and blows air to the direct printing plate 14.

The dryer 42 is equipped with a dryer (not shown), and the dryer blows warm air to the direct printing plate 14.

The fixing unit 44 is provided with a plurality of heating lamps (not shown), and the toner particles adhered to the direct printing plate 14 are fused and fixed by the heat of the heating lamps.

As shown in FIG. 1, the belt conveyor 126
The width dimension BW is smaller than the width dimension DW of the direct printing plate 14 by a predetermined dimension. Therefore, when the direct printing plate 14 is placed on the belt conveyor 126, the side end portion 15 of the direct printing plate 14 is protruded outward by a predetermined dimension from the side end portion 126A of the belt conveyor 126.

The fixing unit 4 is provided above the belt conveyor 126.
A sensor 128 is provided immediately after the downstream side of the sheet No. 4 to move the direct printing plate 14 from the fixing unit 44 to the rotary cutting processing unit 12
It is detected whether or not it has been loaded into 0, and a detection signal is transmitted to a control device (not shown).

(Rotation Cutting Processing Unit 120) As shown in FIG. 1, on the conveying end portion side of the belt conveyor 126, the side wall 18A is provided at the upper end of the side walls 18A on both sides intersecting with the conveying direction (direction of arrow A). A frame 400 traversing the space is attached. The frame 400 has leg plates 400A extending in the vertical direction and parallel to each other.
A lateral plate 400B extending outward is provided at the lower end of 0A. The horizontal plate 400B is fixed to the upper end of the side wall 18A by a screw (not shown). A positioning pin 408 is fixed to the upper end of the side wall 18A, and the mounting position of the frame 400 is determined by engaging the positioning pin 408 with a hole 410 formed in the lateral plate 400B.

The horizontal portion 400C of the frame 400 has a U-shaped cross section, and a pair of bearing portions 41 extending downward on the developing and fixing processing portion side (direction opposite to the arrow A direction).
Two are provided.

As shown in FIGS. 1 and 5, the bearing portion 41
A shaft 414 is attached to the shaft 2 so as to connect the lower end portions thereof, and four bearings 416 are rotatably attached to the intermediate portion of the shaft 414 at predetermined intervals. The lower end portions of the bearings 416 are located above the conveying surface of the belt conveyor 126 by a predetermined dimension, and have a role of suppressing the deformation of the direct printing plate 14.

Below the frame 400, below the carrying surface of the direct printing plate 14, a spline shaft which crosses between the side walls 18A and constitutes guide supporting means for a linear motion bearing so as to be orthogonal to the carrying direction. 418 is provided. Both ends of the spline shaft 418 are fixed to blocks 420 screwed to the inner surface of the leg plate 400A.

The spline shaft 418 is provided with rotary cutting devices 422 and 424 on both sides in the axial direction. The rotary cutting devices 422 and 424 are provided with a bearing support block 426 which constitutes a guide support means, and a linear motion bearing (not shown) in which the spline shaft 418 is inserted is incorporated in the bearing support block 426.
The linear motion bearing can move only in the axial direction of the spline shaft 418 and cannot rotate with respect to the spline shaft 418.

On the upper surface of the bearing support block 426, a first support base 430 which constitutes a guide support means is horizontally attached. As shown in FIG. 6, a bearing 434 whose axial direction is a vertical direction is attached to an end portion of the first supporting base 430 on the developing and fixing processing portion side (the side opposite to the arrow A side). This bearing 4
34 rotatably supports a rotating shaft 436.

Above the first support base 438, a second support base 440, which constitutes a guide support means formed of a thick resin plate (Duracon plate in this embodiment), is horizontally arranged. There is.

The upper portion of the rotary shaft 436 is fixed to the substantially central portion of the second support base 440. As a result, the second support base 440 is rotatable about the rotation shaft 436.

As shown in FIG. 1, the second support base 440.
Is the developing and fixing processing section side (the side opposite to the arrow A direction)
In addition, a substantially rectangular notch 442 is formed in a corner portion on the side facing the other second support base 440. The corner portion of the side surface of the notch 442 along the side wall 18A is inclined, and the upper side corner portion of the side surface facing the developing and fixing processing portion side (direction opposite to the arrow A direction) is largely chamfered.

Further, the second support base 440 has the side wall 18
The side wall 18A side is a lower step surface 440A which is lowered by one step with an extension line of the side surface of the notch 442 along A as a boundary, and the opposite side is an upper step surface 440B.

The upper surface of the upper surface 440B, the upper surface of the belt conveyor 126 and the upper surface of the side wall 18A are all set to the same height.

As shown in FIG. 7A, the lower surface 440A
The side end guide rollers 444, 446, 448, 4
50, 452, 454 are arranged in order from the upstream side in the transport direction of the direct printing plate 14. The side end guide rollers 444, 446, 448, 450, 452, 454 are rotatably supported by a support shaft (not shown) provided upright on the lower surface 440A.

As shown in FIG. 8, the side end guide roller 4
Reference numeral 44 has a structure in which a ball bearing 456 with seals on both ends is covered with a stainless dust-proof cap 458 so that dust such as cutting dust does not enter the bearing and affects rotation (others). Side end guide rollers 446, 448, 450, 452, 454 have the same structure).

More specifically, as shown in FIG. 7A, the end guide rollers 450, 452, 454 are provided with a lower surface 440.
The end guide rollers 444, 44 are arranged in a straight line along the extension line of the step surface 440C between the A and the upper surface 440B.
6 and 468 are arranged so as to approach the side wall 18A side toward the developing and fixing processing section side (direction opposite to the arrow A direction). The end guide roller 45
0, 452, 454 are end guide rollers 444, 44
The diameter is set smaller than 6, 468. Further, the end guide rollers 448, 450, 452, 454 have the end portions on the conveyance path side on the same straight line, and are located closer to the side wall 18A with a predetermined size than the step portion 440C between the upper step surface 440B and the lower step surface 440A. ing.

As shown in FIG. 1, the lower surface 440A includes
Side wall 18A of the end guide rollers 450, 452, 454
A mounting plate 460 having an L-shaped cross section is mounted on the side. As shown in FIG. 7A, the mounting plate 460 is
The longitudinal direction is arranged along the step portion 440C, and one end of a shaft 462 extending to the transport path side is fixed to the vertical surface. As shown in FIGS. 1, 7, and 8, two shafts 462 are fixed to a vertical surface, which are parallel to each other and also to the upper step surface 440B.

As shown in FIG. 8, at the tip of the shaft 462,
An upper surface pressing roller 468 is rotatably attached.
As shown in FIG. 8, the upper surface pressing roller 468 is configured such that the outer ring of the ball bearing 470 is connected to the stainless ring 472.
In addition, donut-shaped seal washers 474 are provided at both ends so that dust such as cutting dust does not enter the bearing and affects rotation. In addition, the upper surface pressing roller 468 is the upper step surface 440B.
Of the direct printing plate 14 when the direct printing plate 14 is placed on the upper surface 440B.
It is attached so as to be located on the upper side by a predetermined dimension (0.5 to 0.7 mm) from the upper surface of the.

As shown in FIG. 9, the second support base 440.
A motor mounting bracket 476 is mounted on the lower surface of the so as to be positionally adjustable. This motor mounting bracket 476,
The second support base 440 is sandwiched between the moving block 478 and the moving block 478 placed on the lower surface 440A.
A screw 480 penetrating a through hole (not shown) of 78 and a through hole (not shown) of the second support base 440 is screwed into a female screw formed on the motor mounting bracket 476. Since the through hole (not shown) of the second support base 440 is formed larger than the outer diameter of the screw 480, the screw 4
If 80 is loosened, the position of the motor mounting bracket 476 can be adjusted in the horizontal direction.

The motor mounting bracket 476 includes the motor 4
82 is attached. The motor 482 is attached so as to be inclined with respect to the second support base 440. As shown in FIG. 9, the axis 483 of the rotating shaft 482A forms an angle θ1 with the second support base 440 of 50 ° in this embodiment, and further, as shown in FIG. 7 (A),
The tip end side of the stepped surface 440C is inclined toward the conveyance path side with respect to the perpendicular 441, and the accuracy θ between the axis 483 and the perpendicular 441 is formed.
2 is set to 10 °. The inclination angle of the rotation shaft 482A may be an angle other than these.

As shown in FIG. 9, a chuck 484 is fixed to the tip of the rotary shaft 482A.
Reference numeral 84 denotes a columnar cemented carbide cutter 48 as a chamfering means.
No. 6 (for example, a carbide cutter Z171 for rotary Anglon manufactured by Minitor Co., Ltd.) is attached.
The rotation direction of the carbide cutter 486 of the rotary cutting device 422 is opposite to the clockwise direction when viewed from the tip,
The rotation direction of the carbide cutter 486 of the rotary cutting device 424 is
Clockwise when viewed from the tip.

As shown in FIGS. 7A and 9, the second support base 440 has a rectangular through hole 488 formed between the side end guide roller 450 and the side end guide roller 452. . The carbide cutter 486 has a rectangular through hole 488.
Through diagonally upward, and the leading end is located above the transport surface of the direct printing plate 14. Carbide cutter 486
When the side edge portion 15 of the direct printing plate 14 abuts at least both the side edge portion guide roller 450 and the side edge portion guide roller 452, the side edge portion 15 abuts on the corner portion of the image forming surface of the side edge portion 15, It can be chamfered to a predetermined size.

As shown in FIG. 9, the upper surface 440B includes
A fixed block 490 is fixed to the side wall 18A side of the moving block 478. A female screw is formed on the fixed block 490, and a screw 492 protruding toward the moving block 478 is screwed onto the female screw. The axial direction of the screw 492 is the second support base 44.
When 0 is viewed from above, it coincides with the axis of the rotary shaft 482A of the motor 482 (see FIG. 7A). Therefore, by tightening the screw 492, the moving block 478 can be pressed and moved to adjust the position of the cemented carbide cutter 486 and change the chamfer dimension. The motor 482 is connected to the control device (not shown) to control the operation.

As shown in FIG. 7A, the spline shaft 4
In FIG. 18, a first stopper ring 494 is fixed to the bearing support block 426 on the side of the conveyance path, and a second stopper ring 496 is fixed to the side wall 18A side of the bearing support block 426.

As for the position of the first stopper ring 494, the bearing support block 426 is located at the first stopper ring 4 position.
Direct printing plate 1 conveyed when it comes into contact with 94
The leading end corner portion of the conveyance direction 4 is positioned so as to contact the conveyance path side with respect to the rotation center of the side end guide roller 444,
Further, the position of the second stopper ring 496 is set such that when the bearing support block 426 abuts on the second stopper ring 496, the cemented carbide cutter 486 is set to the direct printing plate 14.
It is located at a position away from the side end portion 15 of a predetermined dimension or more.

Further, on the spline shaft 418, a ring 498 is arranged closer to the conveyance path than the first stopper ring 494.
Is fixed. One of the tension coil springs 502 as an urging means is locked to the ring 498. The other side of the tension coil spring 502 is locked to a corner portion of the first support base 438 on the transport path side. The tension coil spring 502 allows the first support base 43
8 is always pulled toward the transport path.

An air cylinder fixing block 506 is fixed to the spline shaft 418 between the first stopper ring 494 and the ring 498. An angle 508 is fixed to the air cylinder fixing block 506, and an air cylinder 510 forming a part of the moving means is fixed to the angle 508.

This air cylinder 510 is connected to a compressor (not shown) which constitutes a part of the moving means via a tube 512 which also constitutes a part of the moving means and a solenoid valve (not shown), and the cylinder rod 510A is splined. It is adapted to move in and out along the axial direction of the shaft 418. The cylinder rod 510A is retracted by a built-in spring (not shown) (not shown) when air is not supplied, and protrudes when predetermined air is supplied. The operation of the solenoid valve is controlled by a control device (not shown) as control means.

Beyond this cylinder rod 510A,
A contact plate 514 fixed to the side surface of the first support base 438.
Is located. When the cylinder rod 510A projects, the rotary cutting devices 422 and 424 are pushed to move to the side end portion 15 side, and the bearing support block 426 moves to the second position.
It abuts on the stopper ring 496 and stops. On the other hand, when the cylinder rod 510A retracts, the rotary cutting devices 422 and 424 are pulled by the tension coil spring 502, and the bearing support block 426 moves to the first position.
It abuts on the stopper ring 494 (see FIG. 7A).

On the upper surface of the first support base 438,
A rotation stopper 516 is fixed on the downstream side (arrow A direction) in the transport direction with respect to the end surface of the second support base 440 on the downstream side in the direct plate transport direction. One of tension coil springs 518 as a biasing means is locked to the lower surface of the corner of the second support base 440 on the upstream side in the direct plate transport direction (the side opposite to the direction of arrow A) on the transport path side. The other of the tension coil springs 518 is locked to the lower surface of the corner portion of the first support base 430. With this tension coil spring 518, the rotary cutting device 424
The second supporting base 440 of the rotary cutting device 422 is urged in the clockwise direction about the rotation axis 436, and the second supporting base 440 of the rotary cutting device 422 is urged in the direction opposite to the clockwise direction about the rotation axis 436 as the rotation center. Normally, this is the state of FIG. 7A in which the second support base 440 is in contact with the rotation stopper 516. The rotary shaft 436 is located closer to the conveying path than the side end guide rollers 444, 446, 448, 450, 452, 454.

The tension coil spring 502 and the tension coil spring 518 are connected to the end guide roller 44.
When the 4, 446, 448, 450, 452, 454 contact the direct printing plate 14, the direct printing plate 14 is not deformed, and the carbide cutter 168 prevents the direct printing plate 14 from being deformed.
The spring constant is set so that the chamfer can be reliably made.

As shown in FIGS. 5, 6, and 7 (A), the side end guide rollers 448, 450, and 45 are located above the cemented carbide cutter 486, with the tip of the cemented carbide cutter 486 substantially at the center.
2, 454 and a suction nozzle 520 as a suction port whose lower surface is opened so as to cover the upper pressing roller 468.
Is arranged (in FIG. 7B, the suction nozzle 520
The area surrounded by is indicated by a chain double-dashed line). Suction nozzle 520
The lower end of the direct printing plate 14 placed on the upper surface 440B of the second support base 440 is positioned with a slight gap therebetween. As shown in FIGS. 1 and 10, the suction nozzle 520 has a duct 522 on the side surface on the arrow A direction side.
However, the duct 524 is provided on the side surface opposite to the arrow A direction side.
However, the duct 526 is connected to the side surface on the transport path side, the duct 528 is connected to the side surface on the side wall 18A side, and the duct 530 is connected to the upper side surface so as to communicate with the inside of the suction nozzle 520 (in FIG. 1, the duct is Illustration is omitted.)

The other ends of the ducts 522, 528 and 530 are connected to a cutting waste recovery blower which constitutes an intake means through a filter (not shown), and the ducts 524 and 52.
A blower blower (not shown) is connected to the other end of 6. Therefore, when the blower blower and the cutting dust collecting blower are operated, the cutting dust of the direct printing plate 14 cut by the cemented carbide cutter 168 receives the air blow from the ducts 524 and 526, and is illustrated via the ducts 522 and 528 and the duct 530. Not collected in the filter. As the filter, a paper filter of a general household vacuum cleaner can be used.

As shown in FIG. 1, the direct printing plate 14 is downstream of the suction nozzle 520 in the conveying direction (direction of arrow A).
A pair of blower nozzles 540 are arranged in the. Figure 6
As shown in FIG. 4, these blower nozzles 540 are formed in a thin box shape in the vertical direction, and have slit-shaped openings 5 parallel to the direct printing plate 14 on the rotary cutting devices 422, 424 side.
42.

As shown in FIG. 1, these blower nozzles 540 are supported at their opposite ends by a pair of shafts 544 suspended from a horizontal portion 400C of the frame 400. The blower nozzle 540 is installed in the duct 54.
6 is connected to a blower blower (not shown),
As shown in FIG. 11, air is jetted obliquely outside from the center side of the transport path of the direct printing plate 14 and toward the suction nozzle 520. That is, in this embodiment, since the cutting dust mainly scatters to the downstream side in the transport direction due to the rotation direction of the cemented carbide cutter 168, the air is blown from the blower nozzle 520, so that the lower end of the suction nozzle 520 and the direct printing plate are ejected. Cutting chips are prevented from jumping out of the gap between the cutting edge 14 and the groove 14.

A lower surface support plate 450 that supports the lower surface of the direct printing plate 14 extends from the tray 312 of the water cooling unit 300, which will be described below, to the vicinity of the rear end of the belt conveyor 126 in the transport direction.

As shown in FIG. 12, a saucer 312 is arranged below the cooling unit 300.
Two spray beds 314 for guiding the direct printing plate 14 conveyed from the fixing unit 44 in the direction of arrow A in FIG. These spray beds 3
Each of the 14 has an L-shaped cross section with a vertical wall portion 314A on the upstream side in the transport direction of the direct printing plate 14, and is arranged in parallel with each other with a predetermined gap in the transport direction of the direct printing plate 14. ing.

A sensor 316 is provided above the cooling section 300 on the upstream side, and detects whether or not the direct printing plate 14 has been carried into the cooling section 300 from the fixing section 44.
The detection signal is transmitted to the control device 317.

Further, a water absorption pipe 318 is erected from the bottom of the tray 312. This water absorption pipe 318
Is bifurcated near the bottom of the saucer 312,
One is further branched into three, and the tip portion 318A of each branch portion
Are arranged along the lower portions of the three spray beds 314, respectively. The other side of the water absorption pipe 318 is branched into two at the upper part of the three spray beds 314,
The tip portions 318B of the respective branch portions are arranged along the gaps between the three spray beds 314, respectively.

Circular through holes 320 are formed at predetermined intervals along the axial direction (the direction perpendicular to the paper surface of FIG. 12) on the upper surface of the tip portion 318A of the water absorption pipe 318, and the upper wall portion of the spray bed 314 is formed. A circular through hole 322 is formed in 314B coaxially with the through hole 320. On the other hand, circular through holes 324 are formed at predetermined intervals in the lower portion of the tip end portion 318B of the water absorption pipe 318 along the axial direction (the direction perpendicular to the paper surface of FIG. 12), which serves as a spray nozzle. A squeeze roller 326 is provided on the downstream side of the cooling unit 300.
Are provided, and the direct printing plate 14 passes between the squeeze rollers 326.

The water absorption pipe 318 penetrates the bottom of the tray 312 and extends downward, and the cooling water tank 328.
Has reached. Cooling water is filled in the cooling water tank 328, and this cooling water is pumped up into the water absorbing pipe 318 by the pump 330. The operation of the pump 330 is controlled by the control device 317.

On the other hand, one end of the recovery pipe 332 is connected to the bottom of the tray 312, and the recovery pipe 3
The other end of 32 reaches the cooling water tank 328, and the cooling water of the tray 312 can be collected in the cooling water tank 328. A filter 334 is provided in the middle of the recovery pipe 332 to remove foreign matter in the cooling water.

(Elution processing section 22) As shown in FIG.
An alkaline solution is applied to the direct printing plate 14 in the elution processing section 22 to elute the photoconductive photoreceptor layer in the non-image portion (that is, the non-image portion other than the portion where the toner image is formed) of the direct printing plate 14. Elution part 48, squeeze part 50 for removing the excess alkaline solution adhering to direct printing plate 14, water washing part 52 for washing the squeezed direct printing plate 14 with water to remove the alkaline solution, water-washed direct printing plate 1
4, a gum solution applying section 54 for applying the gum solution, a drying section 117 for drying the direct printing plate 14 coated with the gum solution, and a plurality of carrying rollers 56, 58, 60 for nipping and carrying the direct printing plate 14, 62, 64, 66 are provided.

The carrying roller 56 is arranged on the upstream side of the elution processing section 22 (on the side opposite to the direction of the arrow A in FIG. 13), and on the downstream side of the carrying roller 56 in the carrying direction of the direct printing plate 14 ( The elution portion 48 is located on the arrow A direction side in FIG.
Are arranged. The elution section 48 is provided with an elution tank 68, and the elution tank 68 is provided with conveyance rollers 58, 60 and a plurality of guide rollers 88. The direct printing plate 14 is transported to the transport rollers 58 and 60 and the guide roller 88 and immersed in the alkaline solution in the elution tank 68. A circulation pump 84 is connected to the elution tank 68, and the alkaline solution in the tank is sucked to spray the alkaline solution from the nozzle 86 onto the direct printing plate 14.

Further, the direct printing plate 14 in the elution tank 68
A roller-shaped brush 90 is arranged at a position corresponding to the photoconductive photosensitive layer 30. The brush 90 is connected to a rotation driving means such as a motor (not shown), and the rotation driving means rotates the brush 90. A drain pipe 82 is connected to the lower end of the elution tank 68, and the deteriorated alkaline solution in the tank can be discharged to the outside of the tank through the drain pipe 82.

A squeeze portion 50 is disposed downstream of the elution tank 68 in the transport direction of the direct printing plate 14 (direction of arrow A in FIG. 13), and a transport roller 62 is disposed in the squeeze portion 50. There is. The squeeze section 50 is provided with a receiving section 94, and the direct printing plate 14 is sandwiched by the transport rollers 62 to remove the alkaline solution adhering to the surface thereof. A roller 96 is disposed on the receiving portion 94 side of the transport roller 62 so as to be in close contact with the transport roller 62, and the alkaline solution removed by the transport roller 62 falls onto the receiving portion 94 via the roller 96. Also, the receiving portion 94
A pump 98 for returning the removed alkaline solution to the elution tank 68 is connected to the.

The washing section 5 is located downstream of the elution section 48 in the transport direction of the direct printing plate 14 (on the side of arrow A in FIG. 13).
2 is arranged, and a transport roller 64 is attached to the washing section 52.
Are arranged. The water washing unit 52 is provided with a roller-shaped brush 100 and a water receiving tank 102. Water tank 10
Wash water is stored in 2 and this wash water is pump 1
It is sucked up by 04 and sprayed from the nozzle 106 to the direct printing plate 14. The brush 100 is arranged at a position corresponding to the photoconductive photosensitive layer 30 of the direct printing plate 14, and the photoconductive photosensitive layer 30 of the direct printing plate 14 can be washed.

A gum solution application section 54 is arranged downstream of the water washing section 52 in the transport direction of the direct printing plate 14 (direction of arrow A in FIG. 13). The gum solution applying section 54 is provided with a gum solution tank 110.
The gum solution is stored in. The gum solution in the gum solution tank 110 is sucked up by the pump 112 and sprayed from the nozzle 114 to the direct printing plate 14.

(Drying Section 117) The drying section 117 includes a pair of rollers 1 for conveying the direct printing plate 14 to the standby section 118.
15 and a dryer 116 for blowing warm air are provided, and this dryer 116 dries the direct printing plate 14 after the gum treatment.

(Standby Unit 118) As shown in FIG. 3, the standby unit 118 is provided with a conveyor device (not shown), which conveys the direct printing plate 14 in the direction of arrow B in FIG. Transport in the opposite direction.

(Puncher 24) In the puncher 24, a punch (not shown) for forming a notch for positioning the direct printing plate 14 during plate mounting and the direct printing plate 14 are provided.
A conveyor device (not shown) that conveys the sheet to the plate bending section 26 is provided.

(Plate Bending Section 26) The plate bending section 26 is provided with a folding device (not shown) that bends both ends of the direct printing plate 14 in the longitudinal direction by a predetermined dimension.

The operation of this embodiment will be described below. First,
When the main power of the electrophotographic plate making device 10 is turned on,
A solenoid valve (not shown) opens and air is supplied to the air cylinder 5.
The cylinder rod 510A of 10 projects, the rotary cutting devices 422 and 424 are moved to the side wall 18A side, and the cemented carbide cutter 168 is brought into a position where it does not contact the direct printing plate 14.

As shown in FIG. 4, in the drawing section 16, the unexposed direct printing plate 14 has a photoconductive photosensitive layer 30 (not shown in FIG. 4) facing upward and a longitudinal direction along the carrying direction. The transport table 32, which is placed on 32 and on which the direct printing plate 14 is placed, is moved in the direction of arrow A in FIG. 4 by a driving device (not shown). During this movement, the photoconductive photosensitive layer 30 of the direct printing plate 14 on the carrier 32 is positively charged by the charger 34. When the direct printing plate 14 is conveyed directly below the exposure unit 36, the surface of the photoconductive photosensitive layer 30 is irradiated with a laser beam corresponding to an original image emitted from a semiconductor laser (not shown). As a result, the incident portion where the laser beam is incident becomes conductive, and the positive charges move from the surface of the incident portion of the photoconductive photosensitive layer 30 to form an electrostatic latent image corresponding to image information. .

Direct printing plate 14 on which an electrostatic latent image is formed
The sheet is clamped at its end by a clamping claw (not shown), conveyed to the plate discharge section 12, and then discharged from the plate discharge section 12 to the developing and fixing processing section 18.

In the developing and fixing processing section 18, in the direct printing plate 14, the positively charged toner particles in the liquid developer in the developing section 38 are attached to the exposed portions of the photoconductive photosensitive layer 30.

When the direct printing plate 14 reaches the squeeze portion 40, air from a blower (not shown) is blown to both surfaces of the direct printing plate 14 to remove the excess liquid developer adhering to both surfaces. After that, direct printing plate 14
Is conveyed to the drying unit 42, and the toner wet with warm air from a dryer (not shown) is dried.

The direct printing plate 14 thus developed is conveyed to the fixing section 44. In the fixing unit 44, the toner attached to the direct printing plate 14 is melted and fixed by the heat of a heating lamp (not shown) and fixed.

Thereafter, the direct printing plate 14 is conveyed to the rotary cutting processing section 120. When the direct printing plate 14 is conveyed to the rotary cutting processing unit 120, the sensor 128 detects the direct printing plate 14, and the motor 482,
Cutting waste collection blower (not shown) and air cylinder 510
Is activated.

Here, the routine for controlling the motor 482, the cutting waste collecting blower and the air cylinder 510 will be described with reference to the flowchart shown in FIG. Step 6
At 00, as described above, the main power source of the electrophotographic plate making apparatus 10 is turned on.

In step 602, the solenoid valve is opened and air is supplied to the cylinder rod 510A of the air cylinder 510.
Is projected, the rotary cutting devices 422 and 424 are moved to the side wall 18A side, and the cemented carbide cutter 168 is moved to the direct printing plate 14
The bearing support block 4
26 contacts the second stopper ring 496).

At step 604, the front end of the direct printing plate 14 in the carrying direction is detected by the sensor 128.
It is determined whether or not the vehicle has passed before 8, and if it is determined that the vehicle has passed, the process proceeds to step 606.

In step 606, it is judged whether or not a predetermined time (T1) has elapsed since the sensor 128 detected the leading end of the direct printing plate 14 in the carrying direction, and the predetermined time (T
If it is determined that 1) has passed, the process proceeds to step 608.
The predetermined time (T1) referred to here is the sensor 12
8 is a predetermined time shorter than the time when the tip of the direct printing plate 14 that has passed in front of 8 reaches the cemented carbide cutter 168.

In step 608, the motor 482 and the cutting waste collecting blower are activated. In step 610, it is determined whether or not a predetermined time (T2) has elapsed since the sensor 128 detected the leading end of the direct printing plate 14 in the transport direction, and if it is determined that the predetermined time (T2) has elapsed, step 612. Go to. The predetermined time (T2) mentioned here is the time during which the leading edge of the direct printing plate 14 can pass the side edge guide roller 452 by a predetermined dimension.

In step 612, as shown in FIG. 16, the cylinder rod 510A of the air cylinder 510 is retracted, and the urged rotary cutting devices 422 and 424 are moved to the conveyance path side of the direct printing plate 14 and the side end portions thereof are moved. The guide rollers 448, 450, 452, 454 contact the side end portion 15 of the direct printing plate 14, and chamfering is performed in a state where the distance between the cemented carbide cutter 168 and the direct printing plate 14 is kept constant. Further, the chamfering is performed after the front end of the direct printing plate 14 passes through the side end guide roller 452 by a predetermined dimension, so that the direct printing plate 14 is not chamfered by a predetermined dimension from the front end. Note that the dimension not chamfered is calculated from the transport speed of the direct printing plate 14 and the distance from the sensor 128 to the side end guide roller 452, and is predetermined.

The direct printing plate 14 is formed by a folding device (not shown) of the plate bending portion 26, which will be described later. The length is about several mm to several tens of mm, which is equal to or less than the length of this bent portion. The cutting scraps generated by the chamfer scatter mainly on the downstream side of the direct printing plate 14 in the transport direction, but are sucked by the suction nozzle 520 without remaining. Moreover, since air is blown from the blower nozzle 540 and the blown air flows toward between the suction nozzle 520 and the direct printing plate 14, the cutting dust is not scattered to the outside of the suction nozzle 520.

In step 614, the sensor 128 causes the rear end of the direct printing plate 14 in the carrying direction to be detected by the sensor 12.
It is determined whether or not the vehicle has passed before 8, and if it is determined that the vehicle has passed, the process proceeds to step 616.

At step 616, it is judged whether or not a predetermined time (T3) has elapsed since the sensor 128 detected the rear end of the direct printing plate 14 in the carrying direction, and the predetermined time (T3) has passed.
If it is determined that 3) has passed, the process proceeds to step 618.
The predetermined time (T3) referred to here is the sensor 12
8 is a predetermined time shorter than the time until the rear end of the direct printing plate 14 that has passed before 8 passes the side end guide roller 448.

In step 618, a solenoid valve (not shown)
Is opened and air is supplied, the cylinder rod 510A projects, the rotary cutting devices 422, 424 move to the side wall 18A side, and the carbide cutter 168 is brought into a position where it does not contact the direct printing plate 14. This is because when the cemented carbide cutter 168 leaves the direct printing plate 14, it comes into contact with at least the side end guide roller 450 and the side end guide roller 452 at two points, and the direct printing plate 14 has the rear end. Chamfering is not performed for the predetermined dimension on the part side.

At step 620, it is judged whether or not a predetermined time (T4) has elapsed since the sensor 128 detected the trailing edge of the direct printing plate 14, and the predetermined time (T
When it is determined that 4) has passed, the process proceeds to step 622.
Here, the predetermined time (T4) means the above-mentioned step 61.
This is a time longer than the predetermined time (T3) referred to in 6.

At step 622, the motor 482 and the cutting waste collecting blower are stopped. In step 624, it is determined whether or not the main power source has been turned off. If it is determined that the main power source has been turned off, the processing ends,
If it is determined that the main power supply has not been turned off, the process returns to step 604 and the same processing is repeated.

The direct printing plate 14 chamfered by the cemented carbide cutter 486 is as shown in FIG. The chamfering dimension M of the direct printing plate 14 is about half of the wall thickness T.

During the chamfering process by the carbide cutter 486, the side end guide roller 450 and the side end guide roller 452 are urged to constantly contact the side end part 15 so as to move in the vertical direction (thickness). Change in the direction)
Since it is suppressed by 68, when there is a dimensional error of the direct printing plate 14 (when the side end portion 15 is not in a straight line), the direct printing plate 14 is displaced in the width direction (the arrow B direction and the direction opposite to the arrow B direction). In this case, the cemented carbide cutter 486 always keeps the predetermined position of the direct printing plate 14 at a constant position even if the sheet is conveyed while being inclined with respect to the conveying direction, or even if the sheet is deformed by heat during fixing. Can be chamfered in size.

The chamfered direct printing plate 14 is
It is conveyed to the cooling unit 300. As shown in FIG. 12, the direct printing plate 14 conveyed to the cooling unit 300 is conveyed along the spray bed 314 in the direction of arrow A in FIG. Further, the sensor 316 allows the direct printing plate 14
When is detected, the pump operates by the control device. As a result, the cooling water in the cooling water tank 328 is pumped up, and the cooling water is passed through the through hole 32 of the tip portion 318A.
From 0, it is sprayed on the direct printing plate 14,
The direct printing plate 14 is also sprayed from the through hole 324 of the tip portion 318B. Therefore, the direct printing plate 14 is quickly cooled.

The cooling water sprayed on the direct printing plate 14 is collected in the tray 312 and returned to the cooling water tank 328 via the filter 334 provided in the recovery pipe 332. After that, the direct printing plate 14 is squeezed by the squeeze roller 326 to squeeze the cooling water, and the elution processing unit 2
It is transported to 2. Since the direct printing plate 14 is sprayed with cooling water, it is quickly cooled.

As shown in FIG. 13, the direct printing plate 14 conveyed to the elution processing section 22 is nipped by the conveyance rollers 56, conveyed into the elution tank 68, and immersed in the alkaline solution. The direct printing plate 14 dipped in the alkaline solution has a photoconductive photoreceptor layer 30 on which toner is not attached.
, I.e., non-image areas are eluted. At this time, the photoconductive photoreceptor layer 30 of the direct printing plate 14 is rubbed by the brush 90 to promote the elution reaction. By this elution treatment, the surface of the direct printing plate 14 to which the toner is not attached exposes the surface of the conductive support 14 which has been subjected to the hydrophilic treatment.

After the elution treatment, the direct printing plate 14 is squeezed by the squeeze unit 50, which is sandwiched by the conveying rollers 62 and the alkaline solution adhering to the surface thereof is squeezed. The squeezed alkaline solution falls through the roller 96 and is collected in the receiving portion 94. The alkaline solution accumulated in the receiving portion 94 is returned to the elution tank 68 by the pump 90.

The squeezed direct printing plate 14 is conveyed to the water washing section 52, and washing water is sprayed from the nozzle 106. Further, the direct printing plate 14 is rubbed by the brush 100 to completely remove the attached alkaline solution.

When the direct printing plate 14 is conveyed and reaches the gum solution applying section 54, the gum solution is jetted from the nozzle 114 and the gum solution is applied to the direct printing plate 14. The direct printing plate 14 after the gum treatment is conveyed to the direct printing plate 1
When 4 reaches the drying section 117, the gum liquid adhering to the direct printing plate 14 is dried by the hot air of the dryer 116. As a result, the non-image portion of the direct printing plate 14 (portion to which toner is not attached) is made hydrophilic.

The direct printing plate 14 processed by the elution processing unit 22 is then temporarily waited by the waiting unit 118, and is sent to the puncher unit 24 after the plate inspection work and the like, and is positioned by a punch (not shown) for positioning during plate mounting. A notch is formed.

The direct printing plate 14 in which the notch for positioning is formed in the puncher portion 24 is bent at a predetermined size at both ends in the longitudinal direction of the direct printing plate 14 by a folding device (not shown) of the plate bending portion 26. Thus, the plate making process of the direct printing plate 14 is completed.

As described above, when printing is performed using the direct printing plate 14 made by the electrophotographic plate making apparatus 10, the toner 19 (see FIG. 15) attached to the side end portion 15 of the direct printing plate 14 is removed. It does not come into contact with the printed matter because it passes through the chamfered portion. Therefore, even if ink adheres to the toner on the side end portion 15, the ink is not transferred to the printed matter, and high-quality printing can be performed.

Further, in this embodiment, since the side end portion 15 is partially chamfered, the width dimension of the direct printing plate 14 does not change, and the printing can be accurately positioned with reference to the side end portion 15. it can. In this case, the toner adhering to the side end portion 15 has a practically negligible thickness.

17 to 19 below show a modification of the suction nozzle for sucking the cutting chips. A suction nozzle 550 as a suction port shown in FIG. 17 (A) is obtained by downsizing the above-mentioned suction nozzle 520 and omitting a duct on the side surface. As shown in FIG. 17B, this suction nozzle 55
The range surrounded by 0 is a rectangular range indicated by a chain double-dashed line 550A with the tip of the cemented carbide cutter 486 substantially at the center.

The suction nozzle 552 as a suction port shown in FIG. 18A has a columnar shape, and the internal hole is expanded downward. As shown in FIG. 18B, the range surrounded by the suction nozzle 550 is a circular range indicated by a chain double-dashed line 552A with the tip of the cemented carbide cutter 486 substantially at the center.

Suction nozzle 5 as a suction port shown in FIG.
Reference numeral 54 is a pipe having a small diameter that covers the tip of the cemented carbide cutter 486, and is arranged coaxially with the cemented carbide cutter 486.
In this case, since the cutting waste is sucked in the vicinity of the location where the cutting waste is generated, the cutting waste can be collected more reliably.

[0114]

As described above, the lithographic printing apparatus according to the first aspect has the above-mentioned structure, and therefore has an excellent effect that a lithographic printing plate can be produced without deterioration of the quality of printed matter. Further, since the planographic printing apparatus according to the second aspect has the above-mentioned configuration, it has an excellent effect that the chamfered dust can be surely sucked. Further, since the planographic printing apparatus invention according to claim 3 has the above-mentioned configuration, it is possible to prevent chamfering of predetermined dimensions on both end sides of the planographic printing plate in the conveying direction, and to prevent the four corners of the planographic printing plate from becoming acute angles. Has excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a rotary cutting processing unit of an electrophotographic plate making apparatus according to an embodiment of the present invention as viewed from a downstream side of conveyance.

FIG. 2 is a sectional view showing the structure of a direct printing plate used in the electrophotographic plate making apparatus according to an embodiment of the present invention.

FIG. 3 is a plan view showing an arrangement of processing units of an electrophotographic plate making apparatus according to an embodiment of the present invention.

4 is a cross-sectional view showing a drawing unit in FIG.

5 is a front view of the rotary cutting processing section shown in FIG. 1 as viewed from the downstream side of conveyance.

6 is a partial cross-sectional view of a rotary cutting device showing a connecting portion between a first support base and a second support base of the rotary cutting processor shown in FIG.

7A is a plan view showing one of the rotary cutting processing parts shown in FIG. 1, and FIG. 7B is a plan view of the rotary cutting processing part showing a range surrounded by a suction nozzle.

FIG. 8 is a cross-sectional view showing the structures of a side end guide roller and an upper surface pressing roller.

FIG. 9 is a front view showing the vicinity of a motor as seen from the downstream side of conveyance.

FIG. 10 is a perspective view showing a suction nozzle.

FIG. 11 is a plan view showing the orientation of the blowing nozzle.

12 is a cross-sectional view showing the cooling unit of FIG.

13 is a cross-sectional view showing an elution processing section and a drying section of FIG.

FIG. 14 is a flowchart showing a routine for controlling a motor, a cutting waste collecting blower, and an air cylinder.

FIG. 15 is a cross-sectional view showing a direct printing plate that has been chamfered.

FIG. 16 is a plan view of a rotary cutting unit showing a direct printing plate being chamfered.

17A is a perspective view showing a suction nozzle of another embodiment, and FIG. 17B is a plan view of a rotary cutting section showing a range surrounded by the suction nozzle shown in FIG.

FIG. 18A is a perspective view showing a suction nozzle of still another embodiment, and FIG. 18B is a plan view of a rotary cutting processing section showing a range surrounded by the suction nozzle shown in FIG. .

FIG. 19 is a partial cross-sectional front view showing a suction nozzle of still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electrophotographic plate making device (lithographic printing plate making device) 14 Direct printing plate (lithographic printing plate) 15 Side end part 38 Developing part 44 Fixing part 48 Elution part 418 Spline shaft (guide supporting means) 426 Bearing support block (guide supporting means) 430 First support base (guide support means) 436 Rotation shaft 440 Second support base (guide support means) 448 Side end guide roller (first guide) 450 Side end guide roller (first guide) 452 Side end guide roller (first Guide) 454 Side end guide roller (first guide) 486 Carbide cutter (chamfering means) 502 Extension coil spring (biasing means) 510 Air cylinder (moving means) 518 Extension coil spring (biasing means) 520 Suction nozzle (suction) Mouth) 550 Suction nozzle (suction port) 552 Suction nozzle (suction port) 54 suction nozzle (suction port)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Okutsu 1250 Takematsu, Minamiashigara City, Kanagawa Prefecture Fuji Kikai Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A lithographic printing plate forming apparatus which develops a lithographic printing plate with a liquid developer, and then performs fixing and elution processing, wherein the lithographic printing plate is conveyed downstream of the fixing processing unit in the conveying direction of the lithographic printing plate. A chamfering means for chamfering a corner portion on the image forming surface side on the side intersecting with the direction; and at least two points or a predetermined length of a side end portion of the lithographic printing plate connected to the chamfering means and contacting the chamfering means. A first guide that keeps a relative position between a side end portion and the chamfering means constant; a first guide connected to the first guide to rotatably support the first guide about a predetermined rotation axis; A lithographic printing apparatus comprising: a guide supporting unit that movably supports the unit in a direction of approaching and separating from the unit; and a biasing unit that biases the first guide toward the side end. 2. A suction port of suction means for sucking chamfering scraps generated when chamfering the planographic printing plate is provided on the image forming surface side of the planographic printing plate and in the vicinity of the chamfering means. The planographic printing apparatus according to claim 1. 3. A moving means for moving the guide means in a direction of moving toward and away from the side edge portion to move the chamfering means to and away from the side edge portion, and from both end portions in the transport direction of the planographic printing plate. The movement of the moving means is such that the chamfering means is separated from the side end portion by a predetermined dimension, and the chamfering means is brought into contact with the side end portion and chamfered in a predetermined range in the middle portion in the transport direction of the planographic printing plate. 3. The planographic printing apparatus according to claim 1, further comprising: a control unit that controls the.