JPH1177966A - Printing plate-holding mechanism of printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the printing plate-holding mechanism of a printing apparatus, with which a printing plate can be held by means of a simple constitution. SOLUTION: A tip part claw mechanism 131 has a claw seat 148 provided near the surface of a first plate cylinder 11 or a second plate cylinder 12, a lever 152 rockable about a shaft 151 provided in the first plate cylinder 11 or the second plate cylinder 12 and a claw 153 provided on the lever 152. Further, a claw opening and closing mechanism 132 has an air cylinder 157 provided near the first plate cylinder 11 or the second plate cylinder 12 moved to an image recording position and a block 159 provided at the cylinder rod 158 of this air cylinder 157. The lower end part 161 of this block 159 presses the bearing 155 at the second arm 150 of the lever 152 during the movement of the claw 153 in the tip part claw mechanism 131 to the release position of the claw 153.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a printing plate holding mechanism for a printing apparatus.

[0002]

2. Description of the Related Art In such a printing plate holding mechanism,
Conventionally, the printing plate to be mounted on the outer peripheral portion of the plate cylinder is sandwiched between a pawl seat provided on the plate cylinder and a pawl that can abut the pawl seat to thereby hold the printing plate on the plate cylinder. It is attached to the outer periphery.
When the printing plate is mounted on the outer periphery of the plate cylinder, an operator operates a claw opening / closing mechanism having a cam mechanism, so that the end of the printing plate is held between the claw and the claw seat.

[0003]

In such a conventional printing plate holding mechanism, the operator has to operate the claw opening / closing mechanism, and there is a problem that the printing operation cannot be automated.

For this reason, when the printing plate is automatically supplied to the plate cylinder by the printing plate supply device, the cam mechanism is operated by an actuator such as an air cylinder in order to automate the mounting operation of the printing plate. The pawl opening / closing mechanism is driven to selectively position the pawl at a clamping position where the pawl and the pawl seat abut and a release position where the pawl is separated from the pawl coordinate plane.

However, in order to drive the pawl opening / closing mechanism having the cam mechanism to selectively move the pawl between the holding position and the releasing position, it is necessary to employ an actuator having a complicated mechanism and a pawl opening / closing mechanism. is there. Further, when an actuator having such a complicated mechanism and a pawl opening / closing mechanism are provided on the plate cylinder, the plate cylinder itself becomes large and heavy, and the printing cylinder is rotated at a high speed during printing. It becomes necessary to use a motor with output.

An object of the present invention is to provide a printing plate holding mechanism of a printing apparatus capable of holding a printing plate with a simple configuration.

[0007]

According to a first aspect of the present invention, there is provided a printing plate holding mechanism of a printing apparatus for holding an end of a printing plate to be mounted on an outer peripheral portion of a plate cylinder. A claw seat disposed near the surface, a claw for holding the printing plate between the claw seat, and a lever connected to the claw; A claw means capable of swinging between a clamping position at which the claw abuts the surface of the claw seat and a release position at which the claw is separated from the surface of the claw seat; and Urging means for urging toward the plate cylinder, and pressing the lever of the claw means with a pressing portion provided in the reciprocating portion thereof in the vicinity of the plate cylinder, thereby holding the claw means in the holding position. And a reciprocating drive means for moving the reciprocating member to the release position.

According to a second aspect of the present invention, in a printing plate holding mechanism of a printing apparatus for holding an end of a printing plate to be mounted on an outer peripheral portion of a plate cylinder, printing is performed by using the printing plate held on the outer peripheral portion. A printing cylinder that can reciprocate between a printing position for performing printing, and a mounting / removing position of the printing plate for attaching / detaching the printing plate to an outer peripheral portion thereof, and a claw seat disposed near a surface of the plate cylinder; A claw for holding the printing plate between the claw seat and a lever connected to the claw, wherein the claw contacts the surface of the claw seat around a shaft disposed on the plate cylinder; Claw means capable of swinging between a contacting holding position and a release position where the claw is separated from the surface of the claw seat; biasing means for biasing the claw means toward the clamping position; It is disposed near the plate cylinder that has been moved to the attachment / detachment position. By pressing the lever, characterized in that a reciprocating drive means for moving said pawl means to said release position from the clamping position.

According to a third aspect of the present invention, in a printing plate holding mechanism of a printing apparatus for holding an end of a printing plate to be mounted on an outer peripheral portion of a plate cylinder, printing is performed by using the printing plate held on the outer peripheral portion. And a printing plate held on the outer periphery of the first plate cylinder, which is reciprocally movable between a first printing position for performing the printing operation and a printing plate attaching / detaching position for attaching / detaching the printing plate to / from the outer periphery thereof. A second printing cylinder capable of reciprocating between a second printing position for performing the first printing cylinder and the attachment / detachment position, a first claw seat disposed near a surface of the first printing cylinder, A claw for clamping the printing plate between the first claw seat and a lever connected to the claw, wherein the claw is disposed around a shaft disposed on the first plate cylinder, A first position swingable between a clamping position in contact with the surface of the first claw seat and a release position in which the claw is separated from the surface of the first claw seat; Means, biasing means for biasing the first claw means in the direction of the clamping position, a second claw seat disposed near a surface of the second plate cylinder, A claw for holding the printing plate between the claw seat and a lever connected to the claw, and wherein the claw is attached to the second plate cylinder around a shaft provided on the second plate cylinder. A second claw means capable of swinging between a clamping position in contact with the surface of the claw seat of the second claw and a release position in which the claw is separated from the surface of the second claw seat; and the second claw means. An urging means for urging in the direction of the holding position, and a pressing portion disposed near the first plate cylinder or the second plate cylinder moved to the attaching / detaching position and disposed in a reciprocating portion thereof By pressing the lever of the first claw means or the second claw means with the first claw means or the second claw means
Reciprocating drive means for moving said claw means from said holding position to said release position.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a printing apparatus to which a printing plate holding mechanism according to the present invention is applied.

This printing apparatus comprises a first and a second plate cylinder 11,
After recording an image on a printing plate having no image recorded on the plate 12 and making a plate, the ink supplied to the printing plate is applied to the impression cylinder 15 via the first and second blanket cylinders 13 and 14. The printing is performed by transferring the image to the held printing paper.

As will be described later, according to this printing apparatus, an image recording apparatus and a development processing apparatus used in a plate making process of a printing plate and an ink supply apparatus and a dampening solution supply apparatus used in a printing process are used. And so on can be arranged at different positions where they do not interfere with each other, and the degree of freedom of the arrangement relationship can be improved. Further, since an image can be recorded on the printing plate held by the first and second plate cylinders 11 and 12 using a single image recording device, the device can be simplified, and the entire device can be simplified. Prices can be lowered.

This printing apparatus includes a first plate cylinder 11 movable between a first printing position shown by a solid line in FIG. 1 and an image recording position shown by a two-dot chain line, and a first printing cylinder 11 shown by a solid line in FIG. And a second plate cylinder 12 movable between the second printing position and the image recording position.

The first plate cylinder 11 moved to the first printing position
Around the printing plate, an ink supply device 20a for supplying black (K) ink to the printing plate, an ink supply device 20b for supplying magenta (M) ink to the printing plate, and a printing plate. The dampening water supply devices 21a and 21b for supplying dampening water are arranged. Further, around the second plate cylinder 12 moved to the second printing position, an ink supply device 20c for supplying, for example, cyan (C) ink to the printing plate, and a yellow (Y) ink to the printing plate, for example.
An ink supply device 20 d for supplying the ink of the present invention, a dampening solution supply device 21 c for supplying a dampening solution to the printing plate,
21d. Further, around the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, a plate feeding unit 23, a plate discharging unit 24, and an image recording device 25 are provided.
And a developing device 26 are disposed.

The printing apparatus includes a first blanket cylinder 13 provided so as to be in contact with the first plate cylinder 11 and a second blanket cylinder provided so as to be in contact with the second plate cylinder 12. The impression cylinder 1 provided so as to be able to contact the cylinder 14 and the first and second blanket cylinders 13 and 14 at different positions.
5, a paper feed cylinder 16 for passing the print paper supplied from the paper feed unit 27 to the impression cylinder 15, and a chain 1 for discharging the printed print paper received from the impression cylinder 15 to the paper discharge unit 28.
9 and a blanket cleaning device 29
And

The first and second plate cylinders 11 and 12 are connected to first and second plate cylinder moving mechanisms 31 and 32, respectively, which will be described later. 31,3
By the drive of No. 2, it reciprocates between the above-described first or second printing position and the image recording position.

Further, as will be described later, gears 51 arranged concentrically with the first and second plate cylinders 11 are attached to the sides of the first and second plate cylinders 11, respectively. In addition, gears 52 arranged concentrically with the first and second blanket cylinders 13 and 14 are attached to the sides of the first and second blanket cylinders 13 and 14, respectively. Then, when the first plate cylinder 11 moves to the first printing position, the first plate cylinder 1
A gear 51 attached to the first blanket cylinder 13 and a gear 52 attached to the first blanket cylinder 13 are configured to mesh with each other. Similarly, when the second plate cylinder 12 moves to the second printing position, the gear 51 attached to the second plate cylinder 12 and the gear 52 attached to the second blanket cylinder 14
Are configured to mesh with each other.

For this reason, the first plate cylinder 11 rotates synchronously with the first blanket cylinder 13 at the first printing position. Similarly, the second plate cylinder 12 rotates synchronously with the second blanket cylinder 14 at the second printing position.

Further, a traction type plate cylinder rotating mechanism 30, which will be described later, is provided near the image recording position, and the first and second plate cylinders 11 and 12 are both moved to the image recording position. In this state, the plate cylinder rotating mechanism 30
Rotates by the drive of

FIG. 2 is a front view of the above-described first and second plate cylinder moving mechanisms 31 and 32, and FIG. 3 is a side sectional view showing the vicinity of the bearing portion 33 in the first plate cylinder moving mechanism 31. . Since the first and second plate cylinder moving mechanisms 31 and 32 have the same configuration which is symmetrical to each other, the members common to the first and second plate cylinder moving mechanisms 31 and 32 are the same. Are given.

The first and second plate cylinder moving mechanisms 31 and 32
In order to move a bearing portion 33 including a pair of bearings 34 for supporting the support shafts 36 of the first and second plate cylinders 11 and 12, a slot 38 formed in a side plate 37 is provided (see FIG. 2, only the slot 38 is shown, and the side plate 37 is not shown.) The bearing 33 is connected to a slide holder 41 that can move along a guide member 39. The slide holder 41 is provided with a nut 42. The nut 42 is screwed with a ball screw 44 connected to a drive shaft of the motor 35.

For this reason, the first plate cylinder 11 is provided with a motor 35
Is movable together with the slide holder 41. The first plate cylinder 11 is provided with a guide member 39.
Along with the ball screw 44, a solid line in FIG.
Further, a first printing position indicated by a two-dot chain line in FIG.
It moves between an image recording position indicated by a two-dot chain line in FIG. 1 and a solid line in FIG. Similarly, the second plate cylinder 12 is driven by the motor 35 to move the slide holder 41.
It can be moved with. And the second plate cylinder 1
2 along the guide member 39 and the ball screw 44,
A second printing position indicated by a solid line in FIGS. 1 and 2,
It moves between an image recording position indicated by a two-dot chain line in FIG. 1 and a solid line in FIG.

A fixing member 43 for fixing the bearing 33 is provided near the first and second printing positions on the side plate 37. The first plate cylinder 11 is positioned and fixed at the first printing position by the fixing member 43, and the second plate cylinder 12 is positioned and fixed at the second printing position by the fixing member 43.

The first and second plate cylinders 11 and 12 respectively have
First and second plate cylinder moving mechanisms 31 and 32 for the first and second plates
When the first and second plate cylinders 1 and 12 are moved,
A rotation preventing mechanism, described later, for preventing rotation of the first and second motors 12 is provided.

The rotation of the first and second plate cylinders 11 and 12 is prevented by using the rotation preventing mechanism for the following reason. In other words, when the rotational positional relationship between the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 and other members is deviated, the positional deviation of printing and the part This positional relationship needs to be constant at all times because a problem of collision occurs. At this time, at the image recording position, when recording an image on the printing plate held by the first and second plate cylinders 11 and 12 by the image recording device 25 described later, the first and second plates are used. The rotation angle positions of the trunks 11 and 12 are monitored by a photocoupler 87 and a rotary encoder, which will be described later. However, when moving from the image recording position to the first and second printing positions, the first and second plate cylinders 11 and 12 rotate, and the first and second plate cylinders 1 and 2 are rotated.
In some cases, the rotational positional relationship between the first and second blanket cylinders 13 and 14 and the like may be shifted. Therefore, the first and second plate cylinders 1 are rotated by using the rotation preventing mechanism.
First and second plate cylinders 11 and 12 when the first and second plates 12 and 12 move.
It prevents rotation of.

The anti-rotation mechanism comprises first and second plate cylinders 1.
A disk-shaped rotary plate 46 connected to the first and second support shafts 36 and having a cutout in a part of the outer periphery thereof, and the rotation of the rotary plate 46 is regulated by engaging with the cutout of the rotary plate 46. A rotation preventing member 47 and a releasing member disposed near the first and second printing positions for releasing the engagement of the rotation preventing member 47 with the notch of the rotating plate 46 at the first and second printing positions. 48, and a release member 49 disposed near the image recording position to release the engagement of the rotation preventing member 47 with the notch of the rotary plate 46 at the image recording position.

FIG. 4 shows the rotation preventing member 47 provided on the first plate cylinder 11 and the releasing member 4 provided at the first printing position.
FIG. 8 is a schematic diagram showing a relationship with the reference numeral 8. This rotation preventing member 47
Are a lever 54 swingable about a shaft 53 provided in the bearing portion 33, an engaging pin 55 erected on the front side of the lever 54, and a back surface of the engaging pin 55 with respect to the lever 54. The guide pin 56 erected on the side and the guide pin 5
6 and a spring 58 for urging the engaging pin 55 in the direction of the rotating plate 46 by swinging the lever 54. On the other hand, the release member 48
It is composed of a cam member having an inclined surface 59 for guiding the guide pin 56.

The second plate cylinder 12 is provided with a rotation preventing member 47 similar to the above, and the second printing position is also provided with a releasing member 48 similar to the above.

FIG. 7 is a schematic diagram showing the relationship between the rotation preventing member 47 and the release member 49 disposed at the image recording position when the first plate cylinder 11 has moved to the image recording position. The release member 49 is provided on the pressing pin 5 of the rotation preventing member 47 of the first plate cylinder 11 moved to the image recording position.
There is provided a pressing plate 62 which is reciprocated by an air cylinder 61 for pressing the lower side 7.

When the second plate cylinder 12 moves to the image recording position, the pressing pin 57 of the rotation preventing member 47 provided on the second plate cylinder 12 is pressed by the pressing plate 62 of the release member 49. Pressed.

FIG. 8 is a front view of the vicinity of the above-described plate cylinder rotating mechanism 30, and FIG. 9 is a side sectional view showing a main part thereof.
The plate cylinder rotating mechanism 30 is provided with a first,
For rotating the second plate cylinders 11 and 12,
The first and second plate cylinders 11 and 12 are provided on the opposite side of the above-described rotation preventing mechanism. In FIG. 9, the transmission rotor 78 and its moving mechanism are not shown.

The plate cylinder rotating mechanism 30 is connected to a driving roller 76 which is rotated by the drive of a motor 75 and a support shaft 36 of the first plate cylinder 11 or the second plate cylinder 12 to thereby form the first plate cylinder. First and second driven rollers 77 arranged concentrically with the cylinder 11 or the second plate cylinder 12, and a drive roller 76 concentrically arranged with the first plate cylinder 11 or the second plate cylinder 12. And a transmission roller 78 for transmitting drive to one of the first and second driven rollers 77 (hereinafter simply referred to as “driven roller 77”).

The lower end of the drive roller 76 is
9 is immersed in the oil stored therein. Further, as described above, the driven roller 77 is concentric with the first plate cylinder 11 or the second plate cylinder 12 through the support shaft 36 of the first plate cylinder 11 or the second plate cylinder 12. The first printing drum 11 and the second printing drum 12 rotate in synchronization with each other. Further, the transmission roller 78 is rotatably supported by a distal end of a cylinder rod of an air cylinder 80 whose base end is swingably connected to a support member 91 via a shaft 92. Accordingly, it is possible to move between a drive transmitting position in which both the driving roller 76 and the driven roller 77 are brought into pressure contact with each other and a retracted position separated from the surfaces of the driving roller 76 and the driven roller 77.

For this reason, by moving the transmission roller 78 to the drive transmission position and rotating the drive roller 76 at a constant speed by driving the motor 75, the rotation of the drive roller 76 is transmitted through the transmission roller 78. Driven roller 7
7, the first plate cylinder 11 rotates at a constant speed.
At this time, the driving force of the motor 75 is
Is transmitted to the first plate cylinder 11 or the second plate cylinder 12 by a traction-type drive transmission mechanism utilizing the frictional force between the roller and the driven roller 77 and the transmission roller 78. Alternatively, the second plate cylinder 12 can be accurately rotated without causing rotation unevenness.

At this time, in particular, in the above-described embodiment, since the transmission roller 78 is movable between the drive transmission position where it is pressed against both the drive roller 76 and the driven roller 77 and the retracted position. After the first and second plate cylinders 11 and 12 have moved to the image recording position,
8 is brought into pressure contact with both the driving roller 76 and the driven roller 77 so that the transmission roller 78, the driving roller 76 and the driven roller 77 do not slip, and
The second plate cylinders 11 and 12 can be accurately rotated.

Accordingly, as in the printing apparatus according to this embodiment, the movement of the first and second plate cylinders 11 and 12 between the image recording position and the first and second printing positions is performed as follows. Even when the driven roller 77 has a configuration in which the driven roller 77 moves in a different direction from each other, after the first and second plate cylinders 11 and 12 have been moved to the image recording positions, the transmission roller 78 is driven by the driving roller 76 and the driven roller 77. By moving the transmission roller 78 to the drive transmission position in pressure contact with both of them, the transmission roller 78 can be securely pressed not only to the drive roller 76 but also to each driven roller 77 moved to the image recording position. The first and second plate cylinders 11 and 12 can be accurately rotated without causing slippage between the driven rollers 77.

The driven roller 77 has four positioning members 8 each composed of a V block for positioning and fixing the first and second plate cylinders 11 and 12 at predetermined angular positions.
1a, 81b, 81c and 81d are provided. The positioning members 81 a, 81 b, 81 c, and 81 d engage with a locking pin 85 provided at the end of a lever 84 that swings about a shaft 83 by driving the air cylinder 82, thereby causing the driven roller 77 to move. First and second plate cylinders 1 through
It is used for positioning and fixing 1, 12 at a predetermined rotation angle position.

The driven roller 77 is provided with a detection plate 86 which is used to detect the rotational angle position of the driven roller 77, and the side plate 37 detects the detection plate 86. Photocoupler 87 is provided. The rotation angle position of the driven roller 77, that is, the rotation angle position of the first and second plate cylinders 11 and 12, is determined by the detection signal of the detection plate 86 by the photocoupler 87 and
The first and second plates are connected to the support shafts 36 of the second plate cylinders 11 and 12.
And a rotary encoder (not shown) that generates a pulse signal with the rotation of the plate cylinders 11 and 12.

Further, a light-shielding plate 88 is attached to the support shaft 36 of the first and second plate cylinders 11 and 12.

Next, the first, second rotation preventing mechanism
Anti-rotation operation for the second plate cylinders 11, 12, and
The rotation driving operation of the first and second plate cylinders 11 and 12 by the above-described traction type plate cylinder rotation mechanism 30 will be described. In the following description, the rotation prevention operation and the rotation driving operation for the first plate cylinder 11 will be described. However, the rotation prevention operation and the rotation driving operation for the second plate cylinder 12 are also performed by the same process.

As shown in FIG. 4, the first plate cylinder 11 is
In the printing position of the first plate cylinder 11
The gear 51 arranged concentrically with the first blanket cylinder 13 and the gear 52 arranged concentrically mesh with each other.

In this state, when the first plate cylinder 11 starts moving from the first printing position to the image recording position by the first plate cylinder moving mechanism 31, as shown in FIG. The gear 51 arranged coaxially with the cylinder 11 and the gear 52 arranged coaxially with the first blanket cylinder 13 are gradually disengaged. In addition, the rotation preventing member 4
7, the guide pin 56 slides along the inclined surface 59 of the release member 48, and the lever 54 swings about the shaft 53, so that the engagement pin 55 starts moving into the notch in the rotating plate 46. .

At this time, the gear 51 disposed coaxially with the first plate cylinder 11 and the gear 52 disposed coaxially with the first blanket cylinder 13 completely mesh with each other. The first plate cylinder 1 has not been released and has been rotated by the rotation preventing member 47.
Since the rotation of 1 is not yet performed, the first plate cylinder 11 moves toward the image recording position while rotating counterclockwise in the state shown in FIG. Therefore, it is possible to prevent the gears 51 and 52 from being damaged by collision.

Then, as shown in FIG. 6, the first plate cylinder 1
1 further moves toward the image recording position, and the first plate cylinder 1
In a state where the gear 51 arranged coaxially with the gear 1 and the gear 52 arranged coaxially with the first blanket cylinder 13 are released, the guide pin 56 of the rotation preventing member 47 is released.
Is completely disengaged from the inclined surface 59 of the release member 48, and the engagement pin 55 is completely housed in the notch in the rotating plate 46. Therefore, rotation of the first plate cylinder 11 is prevented.

In this state, the first plate cylinder 11 is moved to the image recording position by driving the first plate cylinder moving mechanism 31, as shown in FIG. Then, as shown in FIG. 8, the transmission roller 78 of the plate cylinder rotating mechanism 30 is driven by the air cylinder 80 so that the driving roller 76 and the driven roller 77 are driven.
Are moved to the drive transmission position in pressure contact with both. Thereafter, the pressing plate 62 of the release mechanism 49 is moved from the position indicated by the solid line to the position indicated by the two-dot line in FIG. This allows
When the pressing pin 57 of the rotation preventing member 47 moves downward and the lever 54 swings about the shaft 53, the engaging pin 55 is disengaged from the notch in the rotating plate 46.
Accordingly, the first plate cylinder 11 becomes rotatable.

In this state, the first plate cylinder 11 is rotated at a low speed by the traction type plate cylinder rotating mechanism 30, and a printing plate is mounted on the first plate cylinder 11. Record the image on the printing plate. Then, after the recording of the image on the printing plate is completed, the printing plate is developed by the developing device 26. When the recording and development processing of the image on the printing plate is completed, the first plate cylinder 11 is returned to the origin position using the detection values of the detection plate 86 and the photocoupler 87 and the like. Then, the transmission roller 78 of the plate cylinder rotating mechanism 30 is moved to the retracted position by driving the air cylinder 80, and the air cylinder 82 shown in FIG. 8 is driven to engage the positioning member 81a with the engagement pin 85. Thus, the first plate cylinder 11 is positioned and fixed at a predetermined rotation angle position via the driven roller 77.

Thereafter, the pressing plate 6 in the release mechanism 49
2 is moved from the position indicated by the two-dot chain line in FIG. 7 to the position indicated by the solid line in FIG. As a result, the pressing pin 57 of the rotation preventing member 47 moves upward and the lever 54 swings about the shaft 53 so that the engaging pin 55 of the rotation preventing member 47 Engage. Accordingly, rotation of the first plate cylinder 11 is prevented. Thereafter, the air cylinder 82 is driven so that the positioning member 81a and the engaging pin 85
Disengage with.

Subsequently, by driving the first plate cylinder moving mechanism 31, the first plate cylinder 11 is moved from the image recording position to the first printing position. Along with the movement of the first plate cylinder 11, the rotation preventing member 47 is operated in a reverse operation to the movement of the first plate cylinder 11 from the first printing position to the image recording position shown in FIGS. The engagement between the engagement pin 55 and the notch in the rotary plate 46 is released.

That is, with the movement of the first plate cylinder 11 from the position shown in FIG. 6 to the position shown in FIG.
7, the guide pin 56 slides along the inclined surface 59 of the release member 48, and the lever 54 swings about the shaft 53, so that the engaging pin 55 moves outward from inside the cutout portion of the rotary plate 46. I do. At the same time, the first plate cylinder 11
The meshing operation of the gear 51 arranged concentrically with the first blanket cylinder 13 and the gear 52 arranged concentrically is started.

At this time, the gear 51, which is arranged concentrically with the first plate cylinder 11, and the gear 52, which is arranged concentrically with the first blanket cylinder 13, start the meshing operation. Accompanying
The prevention of rotation of the first plate cylinder 11 by the rotation preventing member 47 is released, and the first plate cylinder 11 moves toward the first printing position while rotating clockwise in the state shown in FIG. I do. Therefore, it is possible to prevent the gears 51 and 52 from being damaged by collision.

Then, as shown in FIG. 4, the first plate cylinder 1
1 is returned to the first printing position, the gear 51 and the first blanket cylinder 1 arranged concentrically with the first plate cylinder 11
The gear 3 and the coaxially arranged gear 52 completely mesh with each other.

Referring again to FIG. 1, around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position,
As described above, the image recording device 25, the plate feeding unit 23, and the plate discharging unit 24 are arranged.

FIG. 10 is a schematic side view showing the image recording apparatus 25, the plate feeding section 23 and the plate discharging section 24, and FIG. 11 is a schematic plan view of the image recording apparatus 25.

The above-described image recording device 25 uses a laser beam in the main scanning direction with respect to a printing plate that moves in the sub-scanning direction by rotation of the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position. The image is recorded by scanning the beam 89. The image recording device 25 includes a laser beam 8 as a recording beam modulated based on an image signal.
9, a cylindrical lens 94, a collimating lens 95, a polygon mirror 96 as a deflecting device, an fθ lens 97, two folding mirrors 98, these semiconductor laser 93, and a cylindrical lens 94. , A collimating lens 95, a polygon mirror 96, an fθ lens 97, and a housing 99 for housing a folding mirror 98.

The laser beam 89 emitted from the semiconductor laser 93 is deflected by the action of the polygon mirror 96 to become a scanning beam directed in the main scanning direction, and scans the entire printing plate as the printing plate moves in the sub-scanning direction. By doing
Record the desired image on the printing plate.

The plate supplying section 23 includes a supply cassette 63 for storing a long roll-shaped printing plate on which no image is recorded in a light-tight state, and a leading end portion of the printing plate pulled out from the supply cassette 63. Member 64 and a guide roller 65 for guiding the printing plate to the surface of the first plate cylinder 11 or the second plate cylinder 12, and a cutter 66 for cutting a long printing plate into a sheet-shaped printing plate. And In addition, the above-described plate discharge unit 24 is peeled off by the action of the claw mechanism 73 and the claw mechanism 73 for peeling the printing plate held on the first plate cylinder 11 or the second plate cylinder 12 after printing is completed. A conveyor mechanism 69 for transporting the printing plate to a discharge cassette 68 (see FIG. 1).

Further, around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position, as shown in FIG. 12, the first plate cylinder 11 or the second plate cylinder The printing plate guided on the surface of the plate cylinder 12 is transferred to the first plate cylinder 1.
A pressing roller 130 for pressing the outer peripheral portion of the first or second plate cylinder 12 and a pawl opening / closing mechanism 132 for driving a front end pawl mechanism 131 for holding and holding the front end of the printing plate.
And a rear end claw mechanism 13 for holding the rear end of the printing plate.
A claw opening / closing mechanism 134 for driving the opening / closing of the printing plate 3 and a guide roller mechanism 135 for pressing the printing plate when discharging the printing plate are provided.

The above-described guide member 64 and pressing roller 130 are configured to move synchronously by driving the air cylinder 136.

That is, as shown in FIGS.
The guide member 64 is supported so as to swing about a shaft 137. The guide member 64 is provided in the air cylinder 1.
It is connected via a link 139 to a moving plate 138 which is connected to the 36 cylinder rods. For this reason, the guide member 64 is driven by the air cylinder 136 so that its tip shown in FIG. 13 and FIG.
15 reciprocates between a guide position close to the surface of the plate cylinder 12 and a retracted position separated from the surface of the first plate cylinder 11 or the second plate cylinder 12 shown in FIG.

On the other hand, the pressing roller 130 is connected to the cylinder rod of the air cylinder 136 via a connecting member 147.
And a standby position in which the tip shown in FIG. 14 is separated from the surface of the first plate cylinder 11 or the second plate cylinder 12 and the surface of the first plate cylinder 11 or the second plate cylinder 12 shown in FIG. It reciprocates between adjacent pressing positions.

The tip claw mechanism 131 for holding the tip of the printing plate described above is disposed on the first plate cylinder 11 and the second plate cylinder 12, respectively. This tip claw mechanism 131
As shown in FIGS. 13 to 15, a pawl seat 148 arranged near the surface of the first plate cylinder 11 or the second plate cylinder 12 is provided.
And a lever having a first arm 149 and a second arm 150 extending in different directions from each other and capable of swinging about a shaft 151 provided on the first plate cylinder 11 or the second plate cylinder 12. 152 and the first arm 1 of the lever 152
And a claw 153 disposed on the 49 side. The lever 152 and the pawl 153 constitute a pawl means according to the present invention.

At the ends of the first and second arms 149 and 150 of the lever 152, bearings 154 and
55 is attached. Also, as shown in FIG. 22, the lever 152 is a coil spring 1 disposed around the shaft 151.
The coil spring 156 is urged in the direction of the arrow shown in FIG. For this reason, the claw 153 disposed on the side of the first arm 149 of the lever 152 has, as shown in FIG.

As shown in FIGS. 13 to 15, the pawl opening / closing mechanism 132 for driving the front end pawl mechanism 131 to open / close the first plate cylinder 11 or the second plate cylinder 1 moved to the image recording position.
The air cylinder 157 has an air cylinder 157 disposed in the vicinity of the air cylinder 2 and a block 159 disposed at the tip of a cylinder rod 158 of the air cylinder 157. As will be described later, the lower end 161 of the block 159 is used to move the claw 153 of the tip claw mechanism 131 to the release position during the supply of the printing plate.
It functions as a pressing portion for pressing the bearing 155 at the leading end. Further, as described later, the lever 1 is used to move the claw 153 of the tip claw mechanism 131 to the release position when the printing plate is discharged, as described later.
The bearing 15 at the tip of the first arm 149 at 52
4 is formed with a concave portion 162 functioning as a traction portion for traction.

The rear end claw mechanism 133 for holding the rear end of the printing plate described above is disposed on the first plate cylinder 11 and the second plate cylinder 12, respectively. This rear end claw mechanism 133
As shown in FIGS. 16 to 18, a pawl seat 164 rotatable about a shaft 163 provided on the first plate cylinder 11 or the second plate cylinder 12 and a pawl seat 164 are provided on the pawl seat 164. Installed shaft 16
And a coil spring 167 disposed on the claw seat 164 and biasing the claw 166 to rotate counterclockwise as shown in FIG. And the first plate cylinder 11 or the second plate cylinder 12
And a pin 171 for urging the pawl seat 164 to rotate clockwise, and the first plate cylinder 11
Alternatively, a cam mechanism including a cam 173 rotatable about a shaft 172 provided on the second plate cylinder 12 and a cam follower 170 connected to the claw seat 164 is provided. In addition,
The lever 1169 and the pawl 166 constitute a pawl means according to the present invention.

The pawl opening / closing mechanism 134 for driving the opening / closing of the rear end pawl mechanism 133 includes a first plate cylinder 11 or a second plate cylinder 1 moved to an image recording position, as shown in FIGS.
The air cylinder 174 includes an air cylinder 174 disposed in the vicinity of the air cylinder 2 and a contact member 176 disposed at a tip of a cylinder rod 175 of the air cylinder 174. Further, as shown in FIG. 23, the first and second pressing portions 177 having different heights in the reciprocating movement direction of the contact member 176 by the air cylinder 174 are provided at the tip of the contact member 176,
178. As will be described later, the first pressing portion 177 is driven by the air cylinder 174 to move the lever 16.
9, and the second pressing portion 178 comes into contact with the pin 171 of the cam 173 by driving the air cylinder 174.

Next, the first plate cylinder 11 or the second plate cylinder 1
The mounting operation of the printing plate P for mounting the printing plate P on the outer peripheral portion of FIG. 2 will be described with reference to FIGS.

When the printing plate P is mounted on the first plate cylinder 11 or the second plate cylinder 12, the first plate cylinder 11 or the second plate cylinder is rotated by the traction type plate cylinder rotating mechanism 30 described above. 13, the pawl 153 and the pawl seat 148 of the distal-end pawl mechanism 131 are moved to a position facing the guide member 64 and the pressing roller 130, as shown in FIG. At this time, the positioning member 81c disposed on the driven roller 77 shown in FIG. 8 moves to a position facing the engaging pin 85, and in this state, the positioning member 81c and the engaging pin 85 are driven by the air cylinder 82. By engaging the first plate cylinder 11 with the driven roller 77
Alternatively, the second plate cylinder 12 is positioned and fixed at a supply position for holding the leading end of the printing plate P by the leading end pawl mechanism 131.

As shown in FIG. 14, by driving the air cylinder 157 in the pawl opening / closing mechanism 132, the block 159 disposed at the tip of the cylinder rod 158 is moved to the first plate cylinder 11 or the second plate cylinder 12. Move in the direction. As a result, the lower end 161 of the block 159 presses the bearing 155 at the end of the second arm 150 of the lever 152. Accordingly, the lever 152 swings counterclockwise as shown in FIG. 14 against the urging force of the coil spring 156 shown in FIG. 22, and is accordingly disposed on the first arm 149 side of the lever 152. The claw 153 moves to a release position separated from the surface of the claw seat 148. Note that the movement of the block 159 is such that the lower end 161 is moved to the first position.
Stops when it comes into contact with the contact member 181 disposed on the plate cylinder 11 or the second plate cylinder 12.

In this state, the pair of nip rollers 1
The printing plate P is pulled out of the supply cassette 63 by the driving of 79 (see FIG. 10). The leading end of the printing plate P pulled out from the supply cassette 63 is guided by a guide roller 65 and a guide member 64, and the first plate cylinder 11 or the second plate cylinder
Move toward the outer peripheral portion of the plate cylinder 12. The rear end of the printing plate P is cut by the cutter 66.

Then, as shown in FIG. 14, if the leading end of the printing plate P is guided by the guide member 64 and enters between the claw 153 of the leading end claw mechanism 131 and the claw seat 148,
The driving of the air cylinder 157 causes the cylinder rod 15
The block 159 disposed at the end of the first plate cylinder 11
Alternatively, it is moved in a direction away from the second plate cylinder 12.
This causes the lever 152 to swing clockwise as shown in FIG. 14 by the urging force of the coil spring 156 shown in FIG. 22, and accordingly, the claw 153 provided on the lever 152 on the first arm 149 side. Move to the pinching position where it comes into contact with the surface of the pawl seat 148 via the printing plate P, as in the case shown in FIG.
1 is held.

In this state, the moving plate 138 and the connecting member 147 are moved downward by driving the air cylinder 136. Accordingly, as shown in FIG. 15, the guide member 64 moves from the guide position shown in FIGS. 13 and 14 to the retracted position, and the pressing roller 130 moves from the standby position shown in FIGS. 13 and 14 to the pressing position. .

Then, the engagement between the positioning member 81c and the engaging pin 85 is released by driving the air cylinder 82 shown in FIG. 8, and the first plate cylinder 11 or the second plate cylinder 12 is rotated by the plate cylinder rotating mechanism 30. Is rotated counterclockwise. With the rotation of the first plate cylinder 11 or the second plate cylinder 12, the printing plate P whose leading end is held by the leading end pawl mechanism 131 is
It is spread on the first plate cylinder 11 or the second plate cylinder 12.
At this time, the pressing roller 130 transfers the printing plate P to the first plate cylinder 1.
Since the printing plate P is pressed toward the outer peripheral portion of the first or second plate cylinder 12, the printing plate P is not sagged, and the printing plate P is moved around the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. Can be reliably extended to the part.

As described above, the air cylinder 13
The configuration in which the guide member 64 is moved to the retreat position and the pressing roller 130 is moved to the pressing position by the drive of No. 6 is as follows.

That is, in order to surely convey the leading end of the printing plate P to the leading end pawl mechanism 131, it is preferable that the leading end of the guide member 64 and the leading end pawl mechanism 131 be as close as possible. Further, in order to reliably spread the printing plate P on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12,
It is possible to press the printing plate P, the tip of which is held by the tip claw mechanism 131, from a position immediately after the tip claw mechanism 131 toward the outer periphery of the first plate cylinder 11 or the second plate cylinder 12. preferable. Therefore, by adopting a configuration in which the guide member 64 is moved to the retracted position and the pressing roller 130 is moved to the pressing position, it is possible to prevent the guide member 64 and the pressing roller 130 from interfering with each other and to hold the printing plate P at the front end claw. The first plate cylinder 11 is surely transported toward the mechanism 131 and
Alternatively, it can be surely spread on the outer peripheral portion of the second plate cylinder 12.

By rotating the first plate cylinder 11 or the second plate cylinder 12 by the traction type plate cylinder rotating mechanism 30, the printing plate P is transferred from the first plate cylinder 11 or the second plate cylinder 1 to the first plate cylinder 11 or the second plate cylinder 1.
2 and the rear end of the printing plate P is located above the rear end claw mechanism 133 as shown in FIG.
Of the plate cylinder 11 or the second plate cylinder 12 is stopped.
At this time, the positioning member 81d disposed on the driven roller 77 shown in FIG. 8 has moved to a position facing the engagement pin 85, and in this state, the positioning member 81d and the engagement pin 85 are driven by the air cylinder 82. And the rotation angle for holding the first plate cylinder 11 or the second plate cylinder 12 via the driven roller 77 at the rear end of the printing plate P by the rear end claw mechanism 133. Position and fix in position.

Then, the claw opening / closing mechanism 134 for opening / closing the rear end claw mechanism 133 is driven by the rear end claw mechanism 133.
Is opened and closed, and the rear end portion of the printing plate P is held by the rear end claw mechanism 133. This operation is performed as follows.

That is, when the pawl opening / closing mechanism 134 is not operated, as shown in FIG. 16, the pawl seat 164 of the rear end pawl mechanism 133 is placed at a position rotated clockwise by being biased by the spring 168. The pawl 166 is urged by the coil spring 167 so that the tip of the pawl 166 comes into contact with the surface of the pawl seat 164.

In this state, when the contact member 176 is moved in the direction of the first plate cylinder 11 or the second plate cylinder 12 by driving the air cylinder 174, first, as shown in FIG. Second pressing portion 17
8 presses the pin 171 of the cam 173. As a result, the cam 173 rotates around the shaft 172 and presses the cam follower 170. For this reason, the pawl seat 164 is
It rotates counterclockwise as shown in FIG.

When the contact member 176 is further moved in the direction of the first plate cylinder 11 or the second plate cylinder 12 by driving the air cylinder 174, as shown in FIG. The pressing portion 177 presses the tip of the lever 169 connected to the pawl 166. As a result, the pawl 166 connected to the lever 169 is
18, and is disposed at a position where the tip of the claw 166 is separated from the surface of the claw seat 164. At this time, the printing plate P spread on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12 is pressed toward the surface of the first plate cylinder 11 or the second plate cylinder 12 by the pressing roller 130. As shown in FIG. 18, the rear end of the printing plate P is pressed by the pressing action of the pressing roller
6 and between the claw seat 164.

When the rear end of the printing plate P does not easily enter between the claw 166 and the claw seat 164, the rear end of the printing plate P may be pressed by high-pressure air or an actuator. Good.

Next, by driving the air cylinder 174,
The contact member 176 is connected to the first plate cylinder 11 or the second plate cylinder 1.
When the coil spring 167 is moved in a direction away from
The claw 166 rotates counterclockwise by the action of, and becomes the same state as the state shown in FIG. For this reason, the rear end of the printing plate P is sandwiched between the pawl 166 and the pawl seat 164.

When the contact member 176 is further moved in the direction away from the first plate cylinder 11 or the second plate cylinder 12 by driving the air cylinder 174, the spring 1
The action of 68 causes the pawl seat 164 to rotate clockwise to a state similar to the state shown in FIG. For this reason, the printing plate P whose front end is held by the front end claw mechanism 131 and whose rear end is sandwiched by the claw 166 and the claw seat 164 of the rear end claw mechanism 133 rotates the claw seat 164. Accordingly, tension is applied.

Therefore, by setting the urging force of the spring 168 to an appropriate value, the pawl seat 16
By rotating the printing plate P in the direction of applying tension to the printing plate P of No. 4,
It is possible to apply a tension to the printing plate P that can withstand printing. That is, the rear end claw mechanism 133
Functions not only as a holding mechanism for holding the printing plate P but also as a tension applying mechanism for applying tension to the printing plate P.

When the mounting of the printing plate P on the first plate cylinder 11 or the second plate cylinder 12 is completed by the above operation, the positioning member 81d and the engaging pin 8 are driven by driving the air cylinder 82.
After disengaging the first plate cylinder 11 or the second plate cylinder 12 at a low speed by driving the plate cylinder rotation mechanism 30, the first plate cylinder 11 or the second plate cylinder 11 is rotated by the image recording device 25. The surface of the printing plate P held on the outer peripheral portion of the second plate cylinder 12 is irradiated with the modulated laser beam 89 to record an image.

The printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 is attached to the printing plate P by the image recording device 25 as shown in FIG.
As shown in (a), an image area 67a for printing with black ink and an image area 67b for printing with magenta ink are recorded. As shown in FIG. 24B, the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12 has an image area 67c for printing with cyan ink by the image recording device 25, as shown in FIG. And an image area 67d for printing with yellow ink. The image area 67a and the image area 67b are equally distributed in a state where the image area 67a and the image area 67b are attached to the outer peripheral portion of the first plate cylinder 11 (that is, 180 degrees apart from each other).
It is recorded at the position where Similarly, the image area 67c and the image area 67d are recorded at positions where they are equally distributed (that is, 180 degrees apart from each other) when mounted on the outer peripheral portion of the second plate cylinder 12. You.

In the above-described embodiment, in order to simplify the configuration of the first plate cylinder 11 or the second plate cylinder 12, etc., the first plate cylinder 11 or the second plate cylinder 12
Are provided with two image areas 67a, 67b or 67c, 67d, respectively, on one printing plate P held on the outer peripheral portion.
However, each of the first plate cylinder 11 and the second plate cylinder 12 has two sets of the front claw mechanism 131 and the rear end claw mechanism 13.
By disposing 3, the first plate cylinder 11 or the second plate cylinder 12 may be configured to hold two printing plates P. Also in this case, the image area of each printing plate P is equally distributed (that is, 18
Two printing plates P so as to be separated by 0 degrees).
Must be held on the first plate cylinder 11 or the second plate cylinder 12 in a state of being evenly distributed.

Next, the first plate cylinder 11 or the second plate cylinder 1
An operation of discharging the printing plate P from the outer peripheral portion of the printing plate P will be described with reference to FIGS.

In discharging the printing plate P used for printing from the first plate cylinder 11 or the second plate cylinder 12,
The first plate cylinder 11 or the second plate cylinder 12 moved to the printing position by the traction type plate cylinder rotating mechanism 30 described above.
Is rotated to the position shown in FIG.
The block 159 is moved in the direction of the first plate cylinder 11 or the second plate cylinder 12 by driving the air cylinder 157 in 2. Thereafter, the first cylinder 11 or the second cylinder 12 is slightly rotated clockwise by the cylinder rotation mechanism 30.

As a result, as shown in FIG. 20, the first arm 14 of the lever 152 of the tip claw mechanism 131 is moved.
Nine tip bearings 154 are housed in recesses 162 in block 159.

In this state, the positioning member 81b disposed on the driven roller 77 shown in FIG. 8 has moved to a position facing the engaging pin 85, and in this state, the positioning is performed by driving the air cylinder 82. By engaging the member 81b with the engagement pin 85, the driven roller 77
The first plate cylinder 11 or the second plate cylinder 12 is positioned and fixed at a discharge position for detaching the leading end of the printing plate P from the leading end pawl mechanism 131 via.

Thereafter, as shown in FIG. 21, the block 159 disposed at the tip of the cylinder rod 158 is driven by the driving of the air cylinder 157 in the pawl opening / closing mechanism 132.
Is moved in a direction away from the first plate cylinder 11 or the second plate cylinder 12. As a result, the concave portion 162 of the block 159 is connected to the first arm 149 of the lever 152.
The tip bearing 154 is pulled.

Therefore, the lever 152 swings counterclockwise as shown in FIG. 21 against the urging force of the coil spring 156 shown in FIG. 22, and accordingly, the lever 152 moves toward the first arm 149 of the lever 152. The pawl 153 provided is adapted to hold the pawl seat 14.
8 to a release position remote from the surface. Thereby, the printing plate P held by the tip claw mechanism 131 is
Is released. The swing of the lever 152 is caused by the contact member 18 provided at the tip of the second arm 150 on the first plate cylinder 11 or the second plate cylinder 12.
It stops when it comes into contact with 2.

Next, the guide roller mechanism 13 shown in FIG.
5, the guide roller 185 is moved to a position where the guide roller 185 comes into contact with the printing plate P on the first plate cylinder 11 or the second plate cylinder 12 by driving the solenoid 186. Further, the pawl portion 183 of the pawl mechanism 73 is moved from the standby position indicated by the solid line in FIG. 12 to the peeling position of the printing plate P indicated by the two-dot line in FIG.
Is separated from the tip claw mechanism 131, and the claw 1 of the tip claw mechanism 131 is driven by driving the air cylinder 157.
53 is returned to a position where it comes into contact with the surface of the claw seat 148.
Thereafter, the positioning member 81 is driven by driving the air cylinder 82.
b and the engagement pin 85 are released, and then the first plate cylinder 11 or the second plate cylinder 12 is driven by the plate cylinder rotation mechanism 30.
Is rotated counterclockwise at low speed.

At the position where the claw portion 183 moves between the standby position and the peeling position, the claw portion 183 is connected to the first plate cylinder 11.
A notch (not shown) is provided on the first plate cylinder 11 so as not to interfere with the surface of the first plate cylinder. Therefore, the operation of moving the claw portion 183 to the standby position is also performed at the same position of the first plate cylinder 11.

As a result, the leading end of the printing plate P held on the outer periphery of the first plate cylinder 11 or the second plate cylinder 12 is moved by the pawl 183 of the pawl mechanism 73 to the first plate cylinder 11 or the second plate cylinder. After being peeled off from the outer peripheral portion of the second plate cylinder 12, it is guided onto the conveyor mechanism 69 with the rotation of the first plate cylinder 11 or the second plate cylinder 12. The conveyor mechanism 69 is driven at the same speed as the first plate cylinder 11 or the second plate cylinder 12 by a driving device (not shown).

When the rear end claw mechanism 133 holding the rear end of the printing plate P moves to a position facing the claw opening / closing mechanism 134, the first plate cylinder 11 or the second plate cylinder 12 and the conveyor are moved. The driving of the mechanism 69 is stopped, and the pawl 166 of the rear end pawl mechanism 133 is rotated by the pawl opening / closing mechanism 134, thereby releasing the pawl 166 and the pawl seat 164 from nipping the printing plate P. At this time, the leading end of the printing plate P is
Are inserted in the pair of opposed rollers. Accordingly, by subsequently restarting the driving of the conveyor mechanism 69, the printing plate P separates from the first plate cylinder 11 or the second plate cylinder 12, and is conveyed to the discharge cassette 68 (see FIG. 1) by the conveyor mechanism 69. Is done.

Referring again to FIG. 1, as described above, the ink supply devices 20a and 20b are provided around the first plate cylinder 11 moved to the first printing position. An ink supply device 20c and an ink supply device 20d are arranged around the second plate cylinder 12 moved to the second printing position. These ink supply devices 20a, 20
Each of b, 20c, and 20d (hereinafter, collectively referred to as “ink supply device 20”) has a plurality of ink rollers 71 and ink fountains 72.

The ink rollers 71 of the ink supply devices 20a and 20b perform a swinging operation by the action of a cam or the like (not shown). Then, by this swinging operation, the two image areas 6 formed on the printing plate P held on the outer peripheral portion of the first plate cylinder 11 are formed.
When an ink roller 71 of the ink supply device 20a or 20b comes into contact with an arbitrary image area of 7a and 67b, ink can be supplied only to a necessary image area. Similarly, the ink supply device 20
The ink rollers 71 of c and 20d also swing by the action of a cam or the like (not shown). And, by this swinging operation,
The ink roller 71 of the ink supply device 20c or 20d comes into contact with an arbitrary image region of the two image regions 67c and 67d formed on the printing plate P held on the outer peripheral portion of the second plate cylinder 12. With this configuration, ink can be supplied only to a necessary image area.

Referring again to FIG. 1, dampening solution supply device 21
a, 21b, 21c and 21d (when these are collectively referred to as “fountain solution supply device 21”), before the ink is supplied to the printing plate P by the ink supply device 20,
The dampening solution is supplied to the printing plate P. Of these dampening water devices 21, the dampening water supply device 21a is in the image area 67a of the printing plate P, the dampening water supply device 21b is in the image region 67b of the printing plate P, and the dampening water supply device 21c.
Supplies the dampening solution to the image region 67c of the printing plate P, and the dampening solution supply device 21d supplies the dampening solution to the image region 67d of the printing plate P.

Below the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, the above-described developing device 26 is provided. The developing device 26 has a developing unit, a fixing unit, and a diaphragm unit, and is configured to be able to move up and down between a standby position indicated by a two-dot chain line and a developing position indicated by a solid line in FIG.

When developing the printing plate P on which an image is recorded by the image recording device 25 by the developing device 26, the first plate cylinder 11 or the second plate cylinder is driven by the plate cylinder rotating mechanism 30. The developing unit, the fixing unit, and the squeezing unit are sequentially brought into contact with the printing plate P rotating together with the printing plate P.

The first and second blanket cylinders 13 and 14, which are provided so as to be able to contact the first and second plate cylinders 11 and 12,
It has the same diameter as the first and second plate cylinders 11 and 12, and a blanket for ink transfer is mounted on the outer periphery thereof. Then, the first and second blanket cylinders 13, 1
Reference numeral 4 designates a configuration in which the first and second plate cylinders 11 and 12 and the impression cylinder 15 can be freely contacted and separated by a cylinder insertion mechanism described later.

FIG. 25 shows the first blanket cylinder 13.
FIG. 2 is a schematic diagram showing a body insertion mechanism. The mechanism for inserting the second blanket cylinder 14 has the same configuration as the mechanism for inserting the first plate cylinder 13 shown in FIG.

An eccentric shaft 102 having a center different from that of the shaft 101 is continuously provided beside the shaft 101 that rotatably supports the first blanket cylinder 13. Further, around the eccentric shaft 102, an eccentric bearing 103 whose center is further different from the shafts 101 and 102 is provided. Therefore, as shown in FIG. 25, the center 104 of the shaft 101 (that is, the center of the first blanket cylinder 13), the center 105 of the eccentric shaft 102,
The centers 106 of the eccentric bearings 103 are arranged at different positions.

A fixed plate 107 fixed to the eccentric shaft 102 and a fixed plate 108 fixed to the eccentric bearing 103 are connected by two connecting plates 111 and 112 constituting a link mechanism. The connecting portion between the two connecting plates 111 and 112 has a cylinder rod 114 of the air cylinder 113.
The tip is connected. The main body of the air cylinder 113 is connected to one end of a rotation plate 116 that rotates around a shaft 115. Further, the other end of the rotating plate 116 is
It is connected to a fixed plate 118 fixed to the eccentric bearing 103 via a rod 117.

Further, the rotating plate 116 and the shaft 120 of the eccentric member 119 are connected to the two connecting plates 12 constituting the link mechanism.
1, 122. The distal end of a cylinder rod 124 of an air cylinder 123 fixed to the apparatus main body is connected to a connecting portion between the two connecting plates 121 and 122. Further, the worm wheel 125 connected to the eccentric member 119 is screwed with a worm gear 127 rotated by driving of the motor 126.

In such a configuration, when the cylinder rods 114 and 124 of the air cylinders 113 and 123 are extended, as shown in FIG. 25, the surface of the first blanket cylinder 13 and the first plate cylinder 11 And impression cylinder 1
5 are separated by a small distance.

In this state, when the cylinder rod 114 is contracted by driving the air cylinder 113, the first blanket cylinder 13 is moved to the first blanket cylinder 13 by the action of the link mechanism by the two connecting plates 111, 112 and the like. It moves in the direction of the plate cylinder 11 and the cylinder is inserted into the first plate cylinder 11.

In this state, when the cylinder rod 124 is contracted by driving the air cylinder 123, the first blanket cylinder 13 is moved by the action of the link mechanism constituted by the two connecting plates 121, 122 and the like. It moves in the direction of the impression cylinder 15, and is inserted into the impression cylinder 15.
At this time, since the rotating plate 116 also rotates clockwise about the shaft 115, the first blanket cylinder 13 is
It moves not only in five directions but also in the direction of the first plate cylinder 11. Therefore, the first plate cylinder 1 in the first blanket cylinder 13
1 is maintained.

When the eccentric member 119 is rotated, the shaft 120 of the eccentric member 119 moves slightly. For this reason,
The contact pressure between the impression cylinder 15 and the first plate cylinder 11 and the first blanket cylinder 13 is adjusted by rotating the worm wheel 125 connected to the eccentric member 119 by driving the motor 126 and finely moving the shaft 120. can do.
Therefore, the printing pressure at the time of printing using the first blanket cylinder 13 can be adjusted.

Referring again to FIG. 1, the blanket cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 is connected to the take-up roll from the unwind roll via a plurality of press rollers. The cleaning liquid is supplied to a long cleaning cloth stretched along the path to the first path, and the cleaning cloth is brought into contact with the first and second blanket cylinders 13 and 14 and then slid, whereby the first and second cleaning cloths are slid. This is for cleaning the surfaces of the second blanket cylinders 13 and 14. The cleaning cloth was applied to the impression cylinder 1
The surface of the impression cylinder 15 may also be cleaned by contacting the surface of the impression cylinder 5.

The impression cylinder 15 provided so as to be able to contact the first and second blanket cylinders 13 and 14 is provided with the first and second plate cylinders 1.
1, 12 and first and second blanket cylinders 13, 14
直径 of the diameter of Further, the impression cylinder 15 has a gripper (not shown) for holding and transporting the leading end of the printing paper.

The paper feed cylinder 16 arranged adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper feeding cylinder 16 holds and transports the leading end of the printing paper supplied one by one from the paper feeding unit 27 by a gripper (not shown) by a suction board 74 that reciprocates. The leading end of the printing paper held by the gripper is held by the gripper of the impression cylinder 15 when the printing paper is transferred from the paper feed cylinder 16 to the impression cylinder 15.

The paper discharge cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper discharge cylinder 17 has a structure in which a pair of chains 19 is wound around both ends, and grippers are provided on connecting members (not shown) that connect the pair of chains 19. The leading end of the printing paper held by the gripper of the impression cylinder 15 is
When the printing paper is transferred from the impression cylinder 15 to the discharge cylinder 17,
It is held by one of the grippers of the paper discharge cylinder 17. Then, the printing paper is conveyed onto the paper discharge unit 28 as the chain 19 moves and is discharged.

The paper feed cylinder 16 is connected to a drive motor via a belt (not shown). And the paper feed cylinder 1
6, the impression cylinder 15, the paper discharge cylinder 17, and the first and second blanket cylinders 13 and 14 are respectively connected by gears attached to their ends. Further, the first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 14 and the second plate cylinder 12 moved to the second printing position, As described above, they are connected by the gears 51 and 52 attached to their ends, respectively. Accordingly, by the driving of a drive motor (not shown), these paper feed cylinder 16, impression cylinder 15, discharge cylinder 17, first and second blanket cylinders 13, 14, and first and second plate cylinders 11, 12 are moved. Rotate in synchronization with each other.

FIG. 26 is a block diagram showing a main electrical configuration of the printing apparatus. This printing apparatus has a ROM 141 storing operation programs necessary for controlling the apparatus.
And a RAM 1 in which data and the like are temporarily stored during control.
And a control unit 140 including a CPU 143 for executing a logical operation. The control unit 140 controls the ink supply device 20, the image recording device 25, the development processing device 26, the blanket cleaning device 2 via the interface 144.
9, first and second plate cylinder moving mechanisms 31, 32, first and second
Of the blanket cylinders 13 and 14 and the drive circuit 145 for generating a drive signal of a drive unit of the claw opening / closing mechanisms 132 and 134 and the like. The printing apparatus is controlled by the control unit 140, and executes a plate making operation and a printing operation described later.

Next, plate making and printing operations by this printing apparatus will be described. FIG. 27 is a flowchart showing an outline of a plate making and printing operation by this printing apparatus. Note that the printing and plate making operations are performed when multicolor printing is performed on printing paper with four color inks of yellow, magenta, cyan, and black.

First, a prepress process for recording an image on the printing plate P on the first and second plate cylinders 11 and 12 and performing a developing process is executed (step S1). This plate making process is executed according to the process shown in the flowchart of FIG. 28 as a subroutine.

That is, first, the first plate cylinder 11 is moved to the position shown in FIG.
Is moved to the plate making position indicated by the two-dot chain line (step S11). The movement of the first plate cylinder 11 is performed by moving the slide holder 41 along the guide member 39 by driving the motor 35 of the first plate cylinder moving mechanism 31 shown in FIG.

Next, the printing plate P is supplied to the outer periphery of the first plate cylinder 11 (step S12). The supply of this printing plate P is
As described above, the leading end of the printing plate P pulled out of the supply cassette 63 and the rear end of the printing plate P cut by the cutter 66 are connected to the leading end pawl mechanism 131 and the rear end pawl mechanism 133.
It is executed by holding by.

Subsequently, an image is recorded on the printing plate P held on the outer periphery of the first plate cylinder 11 (step S13). This image is recorded on the first plate cylinder 11 by the plate cylinder rotation mechanism 30.
Is rotated at a low speed, and the modulated laser beam 89 is emitted from the image recording device 25 to the printing plate P held on the outer periphery of the first plate cylinder 11.

Next, the printing plate P on which the image has been recorded is developed (step S14). In this developing process, the developing device 26 is raised from the standby position indicated by the two-dot chain line in FIG. 1 to the developing position indicated by the solid line, and then rotated together with the first plate cylinder 11 by driving the plate cylinder rotating mechanism 30. This is performed by sequentially bringing the developing unit, the fixing unit, and the diaphragm unit into contact with the printing plate P.

When the developing process is completed, the first plate cylinder 1
1 is moved to a first printing position indicated by a solid line in FIG. 1 (step S15).

Subsequently, a plate making process for the printing plate P held on the outer periphery of the second plate cylinder 12 is executed by the same operation as in steps S11 to S15 (steps S16 to S2).
0). Then, when the plate making on the printing plate P held on the outer periphery of the first and second plate cylinders 11 and 12 is completed, the plate making process is completed.

Referring again to FIG. 27, when the plate making process is completed, a printing process for performing printing on printing paper using the printing plate P on the first and second plate cylinders 11 and 12 is executed (step). S2). The operation of the printing apparatus in this printing step will be described later in detail.

When the printing process is completed, the printing plate P used for printing is discharged (step S3). In order to discharge the printing plate P, first, the first plate cylinder 11 is moved to a plate making position indicated by a two-dot chain line in FIG. Then, as described above, the first plate cylinder 11 is rotated by the plate cylinder rotating mechanism 30.
Is rotated counterclockwise, and the end of the printing plate P held on the first plate cylinder 11 is peeled off by the claw mechanism 73. Then, the printing plate P is guided by the conveyor mechanism 69, and the discharge cassette is discharged. Discharge into 68. Then, after returning the first plate cylinder 11 to the first printing position, the second plate cylinder 1
2 is moved from the second printing position to the plate making position, and by performing the same operation as described above, the printing plate P held on the second plate cylinder 12 is discharged into the discharge cassette 68.

When the discharging step of the printing plate P is completed, first,
The second blanket cylinders 13, 14 are cleaned (Step S4). At the time of cleaning the first and second blanket cylinders 13 and 14, the first and second blanket cylinders 13 and 14 are moved to the first and second plate cylinders 1 by the cylinder inserting mechanism shown in FIG.
After separating from the first and second and the impression cylinder 15, the first and second
Are rotated. In this state, the cleaning cloth supplied with the cleaning liquid in the blanket cleaning device 29 is supplied to the first and second blankets 13 and 14.
First, by contacting the surface and sliding
The second blanket cylinders 13, 14 are cleaned.

When the cleaning of the first and second blanket cylinders 13 and 14 is completed, it is confirmed whether or not another printing work is to be performed (step S5). To perform another printing operation, the operations of steps 1 to 4 are repeated.

When the printing operation has been completed, the ink is washed (step S6). The cleaning of the ink is performed by removing and cleaning the ink adhered to the ink roller 71 and the ink fountain 72 in each ink supply device 20 by an ink cleaning device (not shown) provided in each ink supply device 20. .

When the ink washing step is completed, all the steps are completed.

Next, the operation of the printing apparatus in the above-described printing process will be described. FIG. 29 to FIG. 34 are explanatory diagrams showing the printing operation of this printing apparatus. In these figures, the length of the printing paper S and the impression cylinder 1 are shown for convenience of explanation.
5, the circumferential lengths of the paper feed cylinder 16 and the paper discharge cylinder 17 are expressed as being the same, but in actuality, the length of the printing paper S is the impression cylinder 15, the paper feed cylinder 16, and the paper discharge cylinder 17. 17 is shorter than the circumference.

The printing operation described below is for the case where multicolor printing is performed on the printing paper with four colors of yellow, magenta, cyan, and black as described above. 29 to 34, for convenience of description,
In the first plate cylinder 11 and the first blanket cylinder 13, the area K on the side used for printing black ink is denoted by K.
Further, the region of the first plate cylinder 11 and the first blanket cylinder 13 on the side used for printing magenta ink is denoted by the symbol M, and the second plate cylinder 12 and the second The area C on the side of the blanket cylinder 14 that is used for printing cyan ink is denoted by C, and the second plate cylinder 12 and the second blanket cylinder 14 on the side that is used for printing yellow ink. The region is denoted by the symbol Y.

In the plate making process prior to the printing process, as described above, the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11, as shown in FIG. An image area 67a for printing with magenta ink and an image area 67b for printing with magenta ink are recorded, and the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12 has As shown in FIG. 24B, an image area 67c for printing with cyan ink and an image area 67d for printing with yellow ink are recorded.

Also, as described above, the ink supply device 2
24a, black ink is supplied to the ink supply device 20b, magenta ink is supplied to the ink supply device 20c, cyan ink is supplied to the ink supply device 20c, and yellow ink is supplied to the ink supply device 20d. The image area 67a of the printing plate P receives black ink from the ink supply device 20a, the image region 67b receives magenta ink from the ink supply device 20b, the image region 67c receives cyan ink from the ink supply device 20c. , Image area 67
d is yellow ink from the ink supply device 20d,
Each is supplied.

First, each dampening solution supply device 21 and each ink supply device 20 are brought into contact only with the corresponding image area of the printing plate P held on the first and second plate cylinders 11 and 12. . Thereby, each image area 67a, 67b, 67
c and 67d have corresponding dampening water supply devices 21a and 21d respectively.
While the dampening solution is supplied from b, 21c, and 21d,
The image area 67a is received from the ink supply device 20a, and the image area 67b is received from the ink supply apparatus 20b.
c, from the ink supply device 20c, and the image area 67d from the ink supply device 20d, black, magenta,
Cyan and yellow inks are supplied. Then, this ink is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

By repeating this operation, ink is supplied to the printing plate P on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
This ink supply operation is repeatedly performed until the printing process is completed.

The printing plate P on the first and second plate cylinders 11 and 12
When the supply of the ink to the first and second blanket cylinders 13 and 14 is completed, the printing paper S is supplied to the paper supply cylinder 16 as shown in FIG. The printing paper S is passed from the paper feed cylinder 16 to the impression cylinder 15.

Then, the impression cylinder 15 is further rotated, and the impression cylinder 1 is rotated.
When the leading end of the printing paper S held on the outer periphery of the first blanket cylinder 5 moves to a position facing the first blanket cylinder 13, the first blanket cylinder 1 is moved by the operation of the cylinder insertion mechanism shown in FIG.
3 is set in a cylinder-inserting state in which it comes into contact with the impression cylinder 15. In this state, as shown in FIG. 30, the leading end of the printing paper S comes into contact with the end of the area of the surface of the first blanket cylinder 13 on the side used for printing black ink.
Then, the black ink is transferred from the image area 67 a of the printing plate P held by the first plate cylinder 11 to the area of the surface of the first blanket cylinder 13 on the side used for printing black ink. I have. Therefore, the first
The black ink is transferred to the printing paper S by further rotating the blanket cylinder 13 and the impression cylinder 15.

When the impression cylinder 15 further rotates and the leading end of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the operation of the cylinder inserting mechanism shown in FIG. As a result, the second blanket cylinder 14 is brought into the cylinder insertion state in which the second blanket cylinder 14 comes into contact with the impression cylinder 15. In this state, as shown in FIG. 31, the leading end of the printing paper S is
Abuts the edge of the area of the surface of the blanket cylinder 14 on the side used for printing cyan ink. Then, the cyan ink is transferred from the image area 67c of the printing plate P held by the second plate cylinder 12 to the area of the surface of the second blanket cylinder 14 on the side used for printing the cyan ink. I have. Therefore, when the second blanket cylinder 14 and the impression cylinder 15 are further rotated, cyan ink is further transferred to the printing paper S on which black ink has already been transferred.

In this state, the impression cylinder 15 is
Continue rotating with the blanket cylinders 13 and 14 of
As shown in FIG. 32, the printing paper S is completely wound around the outer peripheral portion of the impression cylinder 15. Since the impression cylinder 15 has a half diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14, the impression cylinder 15 is wound around the outer periphery of the impression cylinder 15. In the second rotation, the printed printing paper S comes into contact with the area of the surface of the first blanket cylinder 13 on the side used for printing magenta ink.
Then, magenta ink is transferred from the image area 67b of the printing plate P held on the first plate cylinder 11 to the area of the surface of the first blanket cylinder 13 on the side used for printing magenta ink. I have. Therefore, the first
The blanket cylinder 13 and the impression cylinder 15 further rotate, so that the magenta ink is further transferred to the printing paper S on which the black and cyan inks have already been transferred.

When the impression cylinder 15 is further rotated, the printing paper S comes into contact with the end of the area on the surface of the second blanket cylinder 14 on the side used for printing yellow ink. In the area on the surface of the second blanket cylinder 14 that is used for printing the yellow ink,
Yellow ink is transferred from the image area 67d of the printing plate P held by the second plate cylinder 12. For this reason, the second blanket cylinder 14 and the impression cylinder 15 are further rotated, so that the yellow ink is further transferred to the printing paper S on which the black, cyan and magenta inks have already been transferred, and the four-color printing is performed. Is completed.

The leading end of the printing paper S on which the printing of four colors has been completed is transferred from the impression cylinder 15 to the paper discharge cylinder 17 as shown in FIG. Further, after the printing paper S to be printed next is supplied to the paper feed cylinder 16, it is transferred from the paper feed cylinder 16 to the impression cylinder 15.

The printing paper S on which the printing of four colors has been completed
As shown in FIG. 34, by driving a pair of chains 19, the paper is conveyed to a discharge unit 28 together with the gripper of the discharge cylinder 17 and discharged.

As described above, in this printing apparatus, the impression cylinder 15 has a diameter which is 1/2 of the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. , The impression cylinder 15 rotates twice while the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 make one rotation. Then, the printing paper S held on the outer peripheral portion of the impression cylinder 15 while the impression cylinder 15 rotates twice.
Are printed in four colors of yellow, magenta, cyan, and black. Therefore, every time the impression cylinder 15 rotates twice, a new print sheet S is supplied from the sheet supply cylinder 16,
Printing of four colors can be performed continuously.

In this printing apparatus, instead of performing the four-color printing as described above, it is also possible to perform a single-color printing or the like.

For example, when printing is performed using only black ink in this printing press, the first plate cylinder 11
Area 67a, 67b in printing plate P held in
To form the same image. Then, the ink supply device 20
a can supply black ink to both image areas 67a, 67b. Another ink supply device 2
0b, 20c and 20d are the first and second plate cylinders 11 and 12, respectively.
Keep away from In this state, the impression cylinder 15
A new printing paper S is supplied from the paper feed cylinder 16 every time it rotates. Thereby, each time the impression cylinder 15 makes one rotation, the impression cylinder 15
The image in black ink from the image area 67a or 67b on which the same image is formed is transferred to the printing paper S held on the outer periphery of the printing paper S, and monochrome printing can be performed.

Note that, in this case, the second plate cylinder 1
The second and second blanket cylinders 14 are not used. Therefore, the second blanket cylinder 14 may be set in the cylinder-extracted state by the cylinder insertion mechanism shown in FIG. While printing is performed using the first plate cylinder 11 and the first blanket cylinder 13, the second plate cylinder 12 is moved to the image recording position, and the second plate cylinder 12 is moved to the image recording position. The plate making process may be executed above.

[0148]

According to the first aspect of the present invention, when the lever is pressed by the reciprocating drive means disposed near the plate cylinder, the claw means urged in the direction of the holding position is moved to the release position. Since it has a configuration in which the printing plate is held by swinging toward the end, the configuration of the printing plate holding mechanism can be simplified.

According to the second aspect of the present invention, the lever is pressed in the direction of the clamping position by pressing the lever with the reciprocating drive means disposed near the plate cylinder moved to the mounting / detaching position of the printing plate. Since the pawl means is configured to swing toward the release position to hold the edge of the printing plate, the configuration of the printing plate holding mechanism can be simplified.

According to the third aspect of the present invention, the first pawl means or the reciprocating drive means disposed near the first plate cylinder or the second plate cylinder moved to the printing plate attaching / detaching position. By pressing the lever of the second claw means, the first claw means or the second claw means urged in the direction of the holding position is swung toward the release position to hold the end of the printing plate. With the configuration, the configuration of the printing plate holding mechanism can be simplified. At this time, since a common reciprocating drive unit can be used for the first and second plate cylinders, the configuration of the printing plate holding mechanism for the first and second plate cylinders is further simplified. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing apparatus to which a printing plate holding mechanism according to the present invention is applied.

FIG. 2 is a front view of first and second plate cylinder moving mechanisms 31 and 32;

FIG. 3 is a side sectional view showing the vicinity of a bearing section 33 in the first plate cylinder moving mechanism 31.

FIG. 4 is a rotation preventing member 47 provided on the first plate cylinder 11;
FIG. 5 is a schematic diagram showing a relationship between the image forming apparatus and a release member 48 provided at a first printing position.

FIG. 5 shows a rotation preventing member 47 provided on the first plate cylinder 11.
FIG. 5 is a schematic diagram showing a relationship between the image forming apparatus and a release member 48 provided at a first printing position.

FIG. 6 shows a rotation preventing member 47 provided on the first plate cylinder 11;
FIG. 5 is a schematic diagram showing a relationship between the image forming apparatus and a release member 48 provided at a first printing position.

FIG. 7 shows a rotation preventing member 47 provided on the first plate cylinder 11.
FIG. 4 is a schematic diagram illustrating a release member 49 disposed at an image recording position.

FIG. 8 is a front view of the vicinity of the plate cylinder rotating mechanism 30.

FIG. 9 is a side sectional view showing a main part of FIG. 8;

FIG. 10 is a schematic side view showing the image recording device 25, the plate feeding unit 23, and the plate discharging unit 24.

11 is a schematic plan view of the image recording device 25. FIG.

FIG. 12 is a schematic side view showing a printing plate supply and discharge mechanism.

FIG. 13 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 14 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 15 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 16 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 17 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 18 is an explanatory diagram showing a mounting operation of the printing plate P.

FIG. 19 is an explanatory diagram showing a discharging operation of the printing plate P.

FIG. 20 is an explanatory diagram showing a discharging operation of the printing plate P.

FIG. 21 is an explanatory diagram showing a discharging operation of the printing plate P.

FIG. 22 is a perspective view of the vicinity of a lever 152.

23 is a front view of the claw opening / closing mechanism 134. FIG.

FIG. 24 is an explanatory diagram showing an arrangement of an image area 67 on a printing plate P.

FIG. 25 is a schematic view showing a mechanism for inserting the first blanket cylinder 13;

FIG. 26 is a block diagram illustrating a main electrical configuration of the printing apparatus.

FIG. 27 is a flowchart illustrating an outline of plate making and printing operations performed by the printing apparatus.

FIG. 28 is a flowchart showing a plate making process.

FIG. 29 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 30 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 31 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 32 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 33 is an explanatory diagram illustrating a printing operation of the printing apparatus.

FIG. 34 is an explanatory diagram illustrating a printing operation of the printing apparatus.

[Explanation of symbols]

 Reference Signs List 11 first plate cylinder 12 second plate cylinder 13 first blanket cylinder 14 second blanket cylinder 15 pressure cylinder 16 paper feed cylinder 17 paper discharge cylinder 20 ink supply device 21 dampening solution supply device 23 plate supply unit 24 Plate discharging unit 25 Image recording device 26 Developing device 27 Paper feeding unit 28 Paper discharging unit 30 Plate cylinder rotating mechanism 31 First plate cylinder moving mechanism 32 Second plate cylinder moving mechanism 73 Claw mechanism 130 Press roller 131 Tip claw mechanism 132 Claw opening / closing mechanism 133 Rear end claw mechanism 134 Claw opening / closing mechanism 148 Claw seat 152 Lever 153 Claw 156 Coil spring 157 Air cylinder 164 Claw seat 166 Claw 167 Coil spring 169 Lever 174 Air cylinder P Printing plate S Printing paper

Claims (3)

[Claims] 1. A printing plate holding mechanism of a printing apparatus for holding an end of a printing plate to be mounted on an outer peripheral portion of a plate cylinder, wherein a claw seat disposed near a surface of the plate cylinder; A pawl for holding the printing plate between the pawl and a lever, and a lever connected to the pawl, wherein the pawl comes into contact with the surface of the pawl seat around a shaft disposed on the plate cylinder; Claw means capable of swinging between a holding position and a release position where the claw is separated from the surface of the claw seat; biasing means for biasing the claw means toward the holding position; and the plate A reciprocating drive unit that is disposed near the trunk and that presses a lever of the claw unit with a pressing unit provided in the reciprocating unit to move the claw unit from the holding position to the release position; A printing plate holding mechanism for a printing apparatus, comprising: 2. A printing plate holding mechanism of a printing apparatus for holding an end of a printing plate to be mounted on an outer peripheral portion of a plate cylinder, wherein a printing position at which printing is performed by the printing plate held on the outer peripheral portion; A plate cylinder reciprocally movable between a printing plate mounting / detaching position for attaching / detaching the printing plate to / from an outer peripheral portion, a pawl seat provided near the surface of the plate cylinder, and printing between the pawl seat A claw for pinching the plate, and a lever connected to the claw, and a pinch position at which the claw contacts the surface of the claw seat and the claw around a shaft provided on the plate cylinder. A claw means capable of swinging between a release position separated from the surface of the claw seat, a biasing means for biasing the claw means toward the clamping position, and a plate cylinder moved to the attachment / detachment position The lever of the pawl means is pressed by a pressing portion provided near the reciprocating portion. Accordingly, the printing plate holding mechanism of the printing apparatus, characterized in that the pawl means with and a reciprocating drive means for moving the release position from the gripping position. 3. A printing plate holding mechanism of a printing apparatus for holding an edge of a printing plate to be mounted on an outer peripheral portion of a plate cylinder, wherein a first printing position at which printing is performed by the printing plate held on the outer peripheral portion. And a first plate cylinder reciprocally movable between a printing plate attaching / detaching position for attaching / detaching the printing plate to / from the outer peripheral portion thereof, and a second printing position for performing printing by the printing plate held at the outer peripheral portion thereof. A second plate cylinder reciprocally movable between the first plate cylinder, a first pawl seat disposed near a surface of the first plate cylinder, and a first pawl seat. And a nail for holding the printing plate with
A lever connected to the pawl; and a pinch position at which the pawl abuts on a surface of the first pawl seat around a shaft disposed on the first plate cylinder; A first claw means capable of swinging between a release position separated from the surface of the claw seat, a biasing means for biasing the first claw means toward the holding position, A second pawl seat disposed near the surface of the second plate cylinder; and a pawl for holding the printing plate between the second pawl seat and the second pawl seat;
A lever connected to the pawl; and a pinch position where the pawl abuts on a surface of the second pawl seat around a shaft provided on the second plate cylinder, and A second claw means capable of swinging between a release position separated from the surface of the claw seat, an urging means for urging the second claw means toward the clamping position, The first or second plate cylinder moved to the position is disposed in the vicinity of the first or second plate cylinder, and the lever in the first or second pawl means is pressed by a pressing portion provided in the reciprocating portion thereof. A reciprocating drive means for moving the first claw means or the second claw means from the nipping position to the release position.