JPH1199618A - Multicolor printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multicolor printer capable of preventing the generation of stain in printed matter. SOLUTION: An ink supply region 275a having to supply black ink and an ink supply region 275b having to supply magenta ink are made slightly wider than the respective image regions 67a, 67b in a printing plate P. The damping water supply region 276a to the image region 69a to which damping water must be supplied by a damping water supply device and the damping water supply region 276b to the image region 67b to which damping water must be supplied by the damping water supply device are made further wider than the respective ink supply regions 275a, 275b and have an overlap region 277 where both of them are mutually overlapped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor printing apparatus for printing by supplying inks of different colors to a plurality of image areas on a printing plate held by a plate cylinder.

[0002]

2. Description of the Related Art A plate cylinder having a plurality of printing plates mounted on its outer periphery, and a plurality of ink supplies for supplying inks of different colors to image areas of the plurality of printing plates held by the plate cylinder. 2. Description of the Related Art A multi-color printing apparatus that includes an apparatus and performs printing with a plurality of colors of ink using a single plate cylinder or impression cylinder is known.

For example, Japanese Patent Application Laid-Open No. 3-143634 discloses a plate cylinder having two printing plates mounted on the outer periphery thereof, and a method for supplying inks of different colors to the respective printing plates on the plate cylinder. It has two ink supply units, a single dampening solution supply unit for supplying dampening solution to each printing plate on the plate cylinder, and an impression cylinder having a half diameter of the plate cylinder. A multicolor printing apparatus is described in which printing paper is supplied with two colors of ink by supplying the printing paper every time the impression cylinder makes two rotations.

[0004]

Problems to be Solved by the Invention
In the multicolor printing apparatus described in Japanese Patent Application Laid-Open No. 4 (1999) -1995, a fountain solution is supplied by a single fountain solution supply device to printing plates to be printed with inks of different colors.
However, in the case of such a configuration, the ink to be originally supplied to each image area of the printing plate is formed by emulsifying and adhering ink to a roller such as a dampening roller in the dampening solution supply device. Ink of a different color from the above-mentioned ink adheres, and a problem occurs that a printed matter is stained.

On the other hand, in the multicolor printing apparatus described in JP-A-3-143634, two printing plates are mounted on the outer periphery of a single plate cylinder. For this reason, it is necessary to arrange grippers for respectively holding the leading end and the trailing end of the two printing plates on the outer peripheral portion of the plate cylinder, which complicates the configuration of the plate cylinder. In addition, since it is necessary to execute an operation of mounting two printing plates on the outer periphery of the plate cylinder, it takes time for the mounting operation.

In order to solve such a problem, a single printing plate is mounted on the outer periphery of the plate cylinder, and printing is performed on the printing plate with inks of different colors from each other. The first and second dampening water supply devices for individually supplying dampening water to the first and second image areas may be provided.

However, when dampening water is simply supplied to the first image area by the first dampening water supply device and dampening water is supplied to the second image area by the second dampening water supply device. In the first embodiment, the first image region and the second image region of the printing plate are caused by a threading phenomenon of ink that occurs when ink is supplied by an ink supply device for supplying inks of different colors to the first and second image regions. A new problem arises in that ink adheres to an area between the image area and the printed area, causing stains on printed matter.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a multicolor printing apparatus capable of preventing the occurrence of stains on printed matter.

[0009]

According to the first aspect of the present invention, there is provided a plate for holding a printing plate having first and second image areas to be printed with inks of different colors on an outer peripheral portion thereof. Watering device capable of reciprocating between a drum and a supply position for supplying dampening water to the first image area, which is in contact with a surface of the printing plate, and a retracted position separated from the surface of the printing plate. A first dampening solution supply device having a roller, a supply position for supplying dampening water to the second image area, and a retreat position separated from the surface of the printing plate. A watering roller capable of reciprocating between
A fountain solution supply device, and the first plate on the printing plate surface.
The first and the second so that the rear end of the dampening water supply region by the dampening water supply device and the front end of the dampening water supply region by the second dampening water supply device overlap each other. (2) A dampening roller moving mechanism for reciprocating a dampening roller of the dampening water supply device between the supply position and the retreat position.

According to a second aspect of the present invention, in the first aspect of the present invention, the dampening roller moving mechanism includes a cam provided on the plate cylinder and the first and second dampening water supply units. An arm that supports a watering roller in the device, a cam follower that contacts the cam, and by swinging each of the arms, the watering roller in the first and second dampening water supply devices, Each further includes an arm swing mechanism for reciprocating between the supply position and the retreat position.

[0011]

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

The multicolor printing apparatus includes a first and a second plate cylinder 1.
After printing an image on a printing plate on which the images held by the images 1 and 12 are not recorded and making a plate, the ink supplied to the printing plate is applied to the impression cylinder via the first and second blanket cylinders 13 and 14. The printing is performed by transferring the image to the printing paper held by the printer 15.

The multi-color printing apparatus includes a first plate cylinder 11 movable between a first printing position indicated by a solid line in FIG. 1 and an image recording position indicated by a two-dot chain line; And a second plate cylinder 12 movable between the indicated 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.

Further, the multicolor printing apparatus includes a first plate cylinder 1
1st blanket cylinder 13 provided so as to be in contact with 1
A second blanket cylinder 14 provided in contact with the second plate cylinder 12, a first and second blanket cylinder 13,
14, an impression cylinder 15, which is provided so as to be able to abut on the impression cylinder 15 at a position different from each other; It has a paper discharge cylinder 17 around which a chain 19 for discharging printed printing paper to a paper discharge unit 28 and a blanket cleaning device 29.

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 multi-color printing apparatus according to this embodiment, the movement of the first and second plate cylinders 11 and 12 between the image recording positions and the first and second printing positions is accompanied. Therefore, even if 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 move to the image recording position, the transmission roller 78 is driven by the driving roller 76.
The drive roller 78 is moved to a drive transmission position where the drive roller 78 comes into pressure contact with both the
6, 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 transmission roller 78, the driving roller 76 and the driven roller 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,
A plate feeding section 23 and a plate discharging section 24 are arranged.

The plate supply 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 of the printing plate pulled out from the supply cassette 63. A guide member 64 and a guide roller 65 for guiding 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 are provided. It is arranged. The first and second plate cylinders 11 and 12 are provided with a pair of holding claws (not shown) for holding the leading and trailing ends of the printing plate supplied from the plate supply unit 23. .

After the printing is completed, the plate discharging section 24 moves the first plate cylinder 1
It has a claw mechanism 73 for peeling the printing plate held on the first or second plate cylinder 12 and a conveyor mechanism 69 for transporting the printing plate peeled by the action of the claw mechanism 73 to the discharge cassette 68. .

The leading end of the printing plate pulled out of the supply cassette 63 in the plate supplying section 23 is guided by a guide roller 65 and a guide member 64, and one of the first plate cylinder 11 and the second plate cylinder 12 is held. It is added to the nail. Then, the first plate cylinder 11 or the second plate cylinder 12 is rotated by the drive of the plate cylinder rotating mechanism 30, and the printing plate is moved to the first plate cylinder 11.
Alternatively, it is wound around the outer peripheral portion of the second plate cylinder 12. Then, the rear end of the printing plate cut by the cutter 66 is held by the other holding claw. In this state, as described above, while the first plate cylinder 11 or the second plate cylinder 12 is rotated at a low speed by driving the plate cylinder rotation mechanism 30,
The image recording device 25 irradiates a modulated laser beam onto the surface of the printing plate held on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12 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. Further, as shown in FIG. 10B, 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, 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.

Referring again to FIG. 1, as described above, around the first plate cylinder 11 moved to the first printing position, the ink supply devices 20a and 20b are provided. 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 swing operation by the action of a cam 241 and the like described later. Then, by the swinging operation, the ink roller 71 of the ink supply device 20a is applied to the image region 67a of the two image regions 67a and 67b formed on the printing plate P held on the outer peripheral portion of the first plate cylinder 11. But also the image area 67b
When the ink rollers 71 of the ink supply device 20b come into contact with each other, ink can be supplied to each of the image areas 67a and 67b. Similarly, the ink rollers 71 of the ink supply devices 20c and 20d also perform a swing operation by the action of a cam 241 and the like described later. Then, by this swinging operation, the ink roller 71 of the ink supply device 20c is applied to the image region 67c 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. However, the ink supply device 20 is located in the image area 67d.
When the ink rollers 71 of d come into contact with each other, ink can be supplied to each of the image areas 67c and 67d.

Referring again to FIG. 1, the 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.
Is configured to supply a dampening solution to the image region 67c of the printing plate P, and the dampening solution supply device 21d is configured to supply dampening solution to the image region 67d of the printing plate P.

That is, the dampening water supply devices 21a, 21
b, 21c and 21d are provided in the ink supply device 20.
The same number is provided corresponding to a, 20b, 20c, and 20d.

Hereinafter, the configuration of the dampening water supply device 21 will be described. FIG. 11 is a schematic diagram of the dampening solution supply device 21a as viewed from the front side, and FIG. 12 is a schematic diagram of the dampening solution supply device 21a as viewed from the back side. In the following description, among the dampening solution supply devices 21a, 21b, 21c, and 21d, the dampening solution supply device 21a will be particularly described. However, the other dampening solution supply devices 21b, 21c, and 21d also have the same configuration. It has the same configuration as the dampening water supply device 21a.

As shown in FIG. 11, the dampening water supply device 21a includes a watercraft 242 for storing dampening water and a watercraft 242.
A fountain roller 243 that pumps up the dampening water by immersing it in the dampening water in 42, and a damping roller 244 that contacts the surface of the printing plate P and supplies the damping water to the image area 67a.
And an intermediate roller 245 disposed between the water source roller 243 and the watering roller 244.

The immersion roller 244 is shown in FIGS.
As shown in FIG. 2, it is pivotally supported by a pair of left and right first arms 253 that can swing about a shaft 251. The water source roller 243 is pivotally supported by a pair of left and right second arms 254 that can swing about a shaft 252. Further, as shown in FIG. 13, the intermediate roller 245 is connected to the water roller 243 by a pair of left and right support plates 255, and is supported by the second arm 254 via the support plate 255.

Further, as shown in FIG.
43 is provided with a gear 246, and the wetting roller 244 is provided with a gear 2.
47, and a gear 248 is attached to the intermediate roller 245, respectively. The gear 246 and the gear 248 are connected to each other, and are driven by driving means (not shown). The gear 247 attached to the water setting roller 244 meshes with the gear 51 provided on the first plate cylinder 11 at the drive transmission position shown in FIG. For this reason, the dipping roller 244 is rotated by being driven by the first plate cylinder 11, and the water source roller 243 and the intermediate roller 245 are rotated by the dipping roller 24.
4 and rotate independently.

The dampening water stored in the watercraft 242 is supplied to a water source roller 243, a watering roller 244, and an intermediate roller 245.
With the rotation of the water source roller 243 and the intermediate roller 24.
5 to the wetting roller 244 via the first plate cylinder 1
1 on the printing plate P.

Further, the dampening water supply device 21a has a dampening roller moving mechanism 256 for bringing the dampening roller 244 into contact with only a necessary area of the printing plate P, and the dampening roller moving mechanism 256 A contact pressure adjusting mechanism 257 for maintaining a constant contact pressure between the water adhering roller 244 and the intermediate roller 245 when the adhering roller 244 moves;
And a gear retreat mechanism 258 for moving the gear 247 attached to the watering roller 244 from the drive transmission position to the retreat position when the plate cylinder 11 moves to the first printing position.

First, the structure of the water moving roller moving mechanism 256 will be described. FIGS. 14 to 16 show the dampening roller moving mechanism 25 from the dampening water supply device 21a shown in FIG.
It is a schematic diagram which extracts and shows six parts.

The watering roller moving mechanism 256 moves the watering roller 244 via the first arm 253, and the tip of the watering roller 244 comes into contact with a cam 241 attached to the first plate cylinder 11. A lever 263 having a cam follower 261 and swinging about a shaft 262 is provided. The lever 263 is urged by a spring 264 in a direction (clockwise) in which the cam follower 261 contacts the cam 241. On this lever 263, a solenoid 265 and a shaft 266 are arranged.
The first arm 253 is moved in a direction (clockwise direction) in which the contact roller 244 comes into contact with the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11 by a contact pressure adjusting mechanism 257 described later. Being energized.

A shaft 262 as a swing center of the lever 263
Has a contact portion 259 of the first arm 253 at its tip.
A lever 268 provided with a contact member 267 which comes into contact with
A lever 271 having a pin 269 is fixed to the end thereof. This lever 268 is urged counterclockwise by a spring 273. The shaft 262 extends from the front side shown in FIGS. 11 and 14 to the rear side shown in FIG. Also on the rear side shown in FIG. 12, the shaft 262 has a lever 26 provided with a contact member 267 that comes into contact with the contact portion 259 of the first arm 253.
8 is fixed. Further, the shaft 26 on the lever 263
6 is provided with a lever 272, one end of which is connected to the solenoid 265 and the other end of which contacts the pin 269.

FIG. 17 is a side view showing the cam 241 attached to the first plate cylinder 11. In FIG. 17, a cam 241 indicated by a solid line is an image area for printing with magenta ink, which is opposite to the angular position corresponding to the image area 67a for printing with black ink shown in FIG. In the angular position corresponding to 67b, the first plate cylinder 11
It is attached to the front side of. The cam 241 rotates together with the first plate cylinder 11 and contacts the cam follower 261 of the wetting roller moving mechanism 256 in the dampening water supply device 21a to swing the lever 263 around the shaft 262.

The cam 2 indicated by a virtual line in FIG.
41 is a dampening roller 2 in the dampening water supply device 21b.
Used to move 44. This cam 241 is
At an angular position corresponding to the image area 67a for printing with black ink, which is opposite to the angular position corresponding to the image area 67b for printing with magenta ink shown in FIG. Is attached to the plate cylinder 11. The second plate cylinder 12 is also provided with a pair of cams 241 similar to the above.

The moving operation of the dampening roller 244 in the dampening roller moving mechanism 256 of the dampening water supply device 21a is as follows.

That is, as shown in FIG. 14, the wet roller 244 faces the image area 67 a for printing with black ink, and the cam 24 attached to the first plate cylinder 11.
1 and cam follower 2 disposed at the tip of lever 263
In a state where the first plate cylinder 11 is at an angular position where the first plate cylinder 61 is not engaged with the first plate cylinder 61, the first arm 253 swings by the urging force of a contact pressure adjusting mechanism 257 described later, so that the wetting roller 244 is in the third position. It has been moved to a dampening solution supply position in contact with the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11. For this reason, the wetting roller 244 serves as an image area 67 for printing with black ink shown in FIG.
Contact with a.

In this state, when the first plate cylinder 11 rotates, the dipping roller 244 rotates by being driven by the first plate cylinder 11, and the water source roller 243 and the intermediate roller 245 are not shown. By rotating by driving of the driving means, the dampening water stored in the watercraft 242 is transferred from the water source roller 243 to the watering roller 244 via the intermediate roller 245, and is transferred onto the first plate cylinder 11. It is supplied to the entire image area 67a of the printing plate P.

On the other hand, as shown in FIG. 15, the wetting roller 244 is opposed to the image area 67b for printing with magenta ink, and the cam 24 attached to the first plate cylinder 11 is provided.
1 and cam follower 2 disposed at the tip of lever 263
When the first plate cylinder 11 rotates to the angular position where the first plate cylinder 61 faces the cam 61, the cam follower 261 rides on the cam 241, and the lever 263 swings counterclockwise about the shaft 262. As the lever 263 swings counterclockwise, the solenoid 2 disposed on the lever 263 is rotated.
The lever 65 and the lever 272 move, and the lever 272 presses the contact pin 269 provided at the end of the lever 271. The pressing force on the contact pin 269 causes the lever 2
71 rotates with the shaft 262, thereby causing the lever 268 to rotate.
Swings counterclockwise about the axis 262.

Then, with the swing of the lever 268, a contact member 267 provided at the tip of the lever 268 is provided.
Presses the contact portion 259 of the first arm 253, whereby the first arm 253 swings counterclockwise against a biasing force of a contact pressure adjusting mechanism 257 described later.
As a result, as shown in FIG.
Moves to a retracted position separated from the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11. For this reason, the wetting roller 244 in the dampening water supply device 21a is
It does not come into contact with the image area 67b for printing with magenta ink shown in FIG.

The watering roller 244 is connected to the first plate cylinder 1
The movement amount of the watering roller 244 when moving to the retreat position separated from the surface of the printing plate P held on the outer peripheral portion of
Gear 24 attached to watering roller 244 shown in FIG.
7 and the gear 51 attached to the first plate cylinder 11
Is smaller than the total value of the tooth addendum. For this reason, as shown in FIG. 15, even when the watering roller 244 moves to the retracted position, the gear 247 attached to the watering roller 244 and the gear 51 attached to the first plate cylinder 11 Is maintained. Therefore, even when the watering roller 244 moves to the retracted position, the watering roller 244 rotates by receiving the drive from the first plate cylinder 11.

In the dampening water supply device 21b,
A watering roller moving mechanism 256 similar to the above is provided. However, the cam follower 261 of the dampening roller moving mechanism 256 in the dampening water supply device 21b comes into contact with the cam 241 indicated by a virtual line in FIG.
The dampening roller 244 in the dampening water supply device 21b is brought into contact with the image area 67b for printing with magenta ink shown in FIG.

FIG. 18 shows an image area 67 of the printing plate P.
It is explanatory drawing which shows the relationship between a, 67b, the ink supply area | region 275a, 275b, and the dampening water supply area | region 276a, 276b. Here, as described above, the image area 67a
Is an image area to be printed with black ink, and an image area 67b is an image area to be printed with magenta ink. Further, an ink supply area 275a indicated by a broken line in this figure is an area for supplying black ink by the ink supply apparatus 20a, and an ink supply area 275b is an area for supplying magenta ink by the ink supply apparatus 20b. Further, the dampening solution supply area 276a indicated by a solid line in this figure is
The dampening water is supplied by the dampening water supply device 21b, and the dampening water is supplied from the damping water supply region 276b.

As shown in this figure, each ink supply area 2
75a and 275b are areas slightly wider than the image areas 67a and 67b. On the other hand, the dampening solution supply region 276a for the image region 67a indicated by the solid line and the dampening solution supply region 276b for the image region 67b indicated by the two-dot line are wider than the ink supply regions 275a and 275b, and Overlap area 2 where both overlap each other
77.

For this reason, the dampening solution is reliably supplied to the entire area between the image area 67a to which the black ink is to be supplied and the image area 67b to which the magenta ink is to be supplied in the printing plate P. And the ink supply device 2
Even when the ink stringing phenomenon or the like occurs when the ink is supplied to the printing plate P according to the image areas 0a and 20b, the image area 6
It is possible to prevent the occurrence of contamination with ink in an area between the area 7a and the image area 67b.

The dampening water supply area 276a,
In order to set 276b at a desired position and to form a predetermined overlapping region 277, the shape of the cam 241 and the arrangement of the dampening water supply devices 21a and 21b may be appropriately adjusted.

Further, this wetting roller moving mechanism 257
In FIG. 16, as shown in FIG. 16, the lever 272 is moved to the shaft 2 by the action of a solenoid 265 disposed on the lever 263.
When swinging clockwise about the center 66, the engagement between the lever 272 and the contact pin 269 provided at the end of the lever 271 is released. For this reason,
The lever 26 is placed on a cam 241 attached to the first plate cylinder 11.
Even if the lever 263 swings counterclockwise about the shaft 262 by the cam follower 261 disposed at the tip of the third climbing, unlike the case shown in FIG. The hit pin 269 is not pressed. Therefore, since the first arm 253 does not swing, the watering roller 244 is provided on the printing plate held on the outer peripheral portion of the first plate cylinder 11 regardless of the rotation angle position of the first plate cylinder 11. Stop at the supply position abutting the surface of P.

Therefore, for example, in the case of supplying the dampening solution to both the image areas 67a and 67b in the printing plate P by the dampening solution supply device 21a in the monochromatic printing described later, as shown in FIG. By stopping the dampening roller 244 at the supply position by the action of the solenoid 265, it becomes possible to supply dampening water to both image areas 67a and 67b in the printing plate P by the dampening water supply device 21a.

Next, the configuration of the contact pressure adjusting mechanism 257 will be described. FIGS. 19 and 20 are schematic diagrams showing a contact pressure adjusting mechanism 257 portion extracted from the dampening solution supply device 21a shown in FIG.

This contact pressure adjusting mechanism 257 is for keeping the contact pressure between the watering roller 244 and the intermediate roller 245 constant when the watering roller 244 is moved by the watering roller moving mechanism 256 described above. Water roller 2
It has a first contact member 278 and a second contact member 279 for maintaining the distance between the shaft and the intermediate roller 245 constant.

The first contact member 278 is formed by the first contact member 278 described above.
On the arm 253. The first contact member 278 has a circular shape formed concentrically with the watering roller 244. Note that the first arm 253 is
The spring 281 urges the shaft 251 counterclockwise about the axis 251. The first arm 253 is provided with a contact member 282 for restricting the swing amount in the counterclockwise direction by contacting the stopper 283.

The second contact member 279 is formed by the second contact member 279 described above.
The arm 254 is disposed at the distal end. The second contact member 279 has an arc surface concentric with the intermediate roller 245. The second arm 254 is urged counterclockwise about the shaft 252 by the action of the pressing spring unit 284. The urging force of the pressing spring unit 284 on the second arm 254 is set to be larger than the urging force of the spring 281 on the first arm 253. Further, the second arm 254 is connected to the air cylinder 285.

In the contact pressure adjusting mechanism 257, the urging force of the pressing spring unit 284 on the second arm 254 is set larger than the urging force of the spring 281 on the first arm 253. For this reason, as described above, the first arm 253 is moved by the contact pressure adjusting mechanism 257 in the direction in which the wet roller 244 comes into contact with the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11 ( Clockwise). Therefore, as shown in FIG.
A cam 241 and a lever 263 attached to the first plate cylinder 11
When the cam follower 261 disposed at the end of the first plate cylinder is not engaged, the dampening roller 244 contacts the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11 with dampening water. To the supply position.

In this state, if the cam follower 261 provided at the tip of the lever 263 rides on the cam 241 attached to the first plate cylinder 11, as shown in FIG. Move to a retracted position separated from the surface of the printing plate P held on the outer peripheral portion of the first plate cylinder 11. With the movement of the wetting roller 244, the first
The contact member 278 moves in the direction of pressing the second contact member 279. At this time, the first contact member 278
Has a circular shape formed concentrically with the wetting roller 244, and the second contact member 279 has an arc surface concentric with the intermediate roller 245.
Is moved, the axial distance between the watering roller 244 and the intermediate roller 245 is maintained constant, and the contact pressure between the watering roller 244 and the intermediate roller 245 can be maintained constant. .

A water source roller 243 that pumps up the dampening water by immersing it in the dampening water in the watercraft 242 and an intermediate roller 245 that supplies this dampening water to the dampening roller 244 is composed of a pair of left and right support plates. Since they are connected by 255, the contact pressure is constant. Further, the contact pressure between the wetting roller 244 and the intermediate roller 245 is kept constant by the contact pressure adjusting mechanism 257 as described above.
Therefore, the dampening water in the watercraft 242 can be accurately supplied onto the printing plate P.

In the contact pressure adjusting mechanism 257, the second arm 25 is driven by driving the air cylinder 285.
When the second arm 254 starts to swing clockwise against the urging force of the pressing spring unit 284 by pulling the second arm 254, The first contact member 278 is the second contact member 2
It moves along the 79 arc surface. Then, along with the movement of the first contact member 278, the first arm 253
Moves counterclockwise due to the action of the spring 281, and FIG.
As shown in FIG. 0, the wetting roller 244 is connected to the first plate cylinder 11.
Is moved to a retracted position separated from the surface of the printing plate P held on the outer peripheral portion of the printing plate P.

In the swinging operation of the first arm 253, in the first arm 253 on the front side shown in FIG. 20, the contact member 282 provided on the first arm 253 comes into contact with the stopper 283. Stop when you do. On the other hand, in the first arm 253 on the rear side shown in FIG. 12 and FIG. 21 to be described later, the contact portion 288 formed at the end of the first arm 253 Stops when it comes into contact with the pressing portion 289. In this state, as in the case described above, the amount of movement of the gear 247 regulated by the pressing portion 289 of the air cylinder 286 when the watering roller 244 moves to the retracted position is attached to the watering roller 244. The gear 24 is smaller than the total value of the gear addendum of the gear 247 and the gear addendum of the gear 51 attached to the first plate cylinder 11.
The meshing state between the gear 7 and the gear 51 attached to the first plate cylinder 11 is maintained.

Then, the air cylinder 285 is further
When the second arm 254 further swings clockwise by pulling the second arm 254, the intermediate roller 245 further moves together with the second arm 254. At this time, the watering roller 244 is stopped together with the first arm 253 by the action of the stopper 283 described above. For this reason, as shown in FIG.
45 will be separated from each other.

Therefore, when it is not desired to send dampening water to the dampening roller 244 before printing, the air cylinder 2
85, the second arm 254 is swung to the position shown in FIG.
By preventing the transfer of the dampening solution to the dampening roller 45, the supply of the dampening solution to the dampening roller 244 can be shut off. By separating the watering roller 244 and the intermediate roller 245 in this way, it is possible to prevent loss of synchronism when a driving unit (not shown) for driving the intermediate roller 245 is started.

Next, the structure of the gear retracting mechanism 258 will be described. FIG. 21 to FIG. 22 are schematic diagrams showing the gear retracting mechanism 258 extracted from the dampening water supply device 21a shown in FIG.

The gear retracting mechanism 258 is provided for the first plate cylinder 1.
1 to move the gear 247 attached to the watering roller 244 from the drive transmission position to the retracted position when the first arm 253 moves to the first printing position. Among them, an air cylinder 286 having a pressing portion 289 abutting on a contact portion 288 of the first arm 253 disposed on the back side is provided.

With the movement of the first plate cylinder 11 by the first plate cylinder moving mechanism 31, the gear retracting mechanism 25 is moved.
8 operates as follows.

First, in a state where the first plate cylinder 11 has been moved to the first printing position, the above-mentioned contact pressure adjusting mechanism 257 is described.
When the watering roller 244 is moved to the retracted position, the gear 51 attached to the first plate cylinder 11 and the gear 247 attached to the watering roller 244 mesh with each other as shown in FIG. doing. More specifically, as described above, when the watering roller 244 moves to the retracted position, the movement amount of the gear 247 regulated by the pressing portion 289 of the air cylinder 286 is determined by the gear attached to the watering roller 244. The gear 247 attached to the watering roller 244 and the first plate cylinder are smaller than the sum of the tooth addendum of the gear 247 and the gear addendum of the gear 51 attached to the first plate cylinder 11. The meshing state with the gear 51 attached to 11 is maintained.

In this state, the first plate cylinder 1
1 starts moving from the first printing position to the image recording position, as described with reference to FIGS.
1 is a gear 52 attached to the first blanket cylinder 52.
Moves toward the image recording position while rotating. Therefore, the gear 51 attached to the first plate cylinder 11
The gear 247 attached to the watering roller 244 is disengaged from each other while rotating with each other.

On the other hand, when the first plate cylinder 11 moves from the image recording position to the first printing position, the pressing portion 289 is driven by the air cylinder 286 to push the first arm 253 as shown in FIG. Is moved in a direction away from the contact portion 288. Accordingly, the first arm 253 further swings clockwise, and stops at a position where the contact member 282 contacts the stopper 287. In this state, the wetting roller 244 has moved further away from the first plate cylinder 11 than the retracted position. For this reason, as shown in FIG. 22, the gear 247 attached to the watering roller 244 is attached to the first plate cylinder 11 even when the first plate cylinder 11 is moved to the first printing position. Gear 51
Are arranged at a position separated from.

In this state, the first plate cylinder 11 is moved from the image recording position to the first printing position. Then, as shown in FIG. 5, a gear 51 attached to the first plate cylinder 11 is provided.
When the gear and the gear 52 attached to the first blanket cylinder 13 start meshing with each other, the contact portion 288 of the first arm 253 arranged on the rear side is pressed by the pressing portion 289 by driving the air cylinder 286. Press to set the watering roller 2
The gear 247 attached to 44 is moved.

At this time, as described with reference to FIGS. 4 to 6, the first plate cylinder 11 is rotated to the first printing position by the action of the gear 52 attached to the first blanket cylinder 52. Moving towards. For this reason, the gear 51 and the gear 247 start meshing while rotating with each other,
When the plate cylinder 11 is placed at the first printing position, the meshing operation is completed. Therefore, it is possible to prevent the damage caused by the collision between the tooth tip of the gear 51 and the tooth tip of the gear 247.

Referring to FIG. 1 again, below the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position,
The development processing device 26 described above is provided. The development processing device 26 has a development unit, a fixing unit, and a diaphragm unit,
In FIG. 1, it is configured to be able to move up and down between a standby position indicated by a two-dot chain line and a development processing position indicated by a solid line.

When the printing plate P on which an image is recorded by the image recording device 25 is developed by the developing device 26, the first plate cylinder 11 or the second plate cylinder is driven by driving 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. 23 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 also 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 for rotatably supporting 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. 23, 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. 23, 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 to FIG. 1 again, the blanket cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 moves from the unwinding roll to the winding roll via a plurality of pressure rollers. The cleaning liquid is supplied to a long cleaning cloth stuck on the path leading to the first and second blanket cylinders 13 and 14, and then the cleaning liquid is slid. , The surfaces of the second blanket cylinders 13 and 14 are cleaned. 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 in contact with 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 disposed 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. 24 is a block diagram showing a main electrical configuration of the multicolor printing apparatus. This multicolor printing device
ROM in which operation programs required for controlling the device are stored
141 and R in which data and the like are temporarily stored during control.
The control unit 140 includes an AM 142 and a CPU 143 that executes 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 29, the first and second plate cylinder moving mechanisms 31, 32, the first and the second via the interface 144. A drive circuit 145 that generates a drive signal for a drive unit or the like in a mechanism for inserting the second blanket cylinders 13 and 14 and the like.
Is connected to The multi-color 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 the multicolor printing apparatus will be described. FIG. 25 is a flowchart showing an outline of a plate making and printing operation by this multicolor 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 performed in accordance with a subroutine shown in the flowchart of FIG.

That is, first, the first plate cylinder 11 is
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
This operation is performed by holding the leading end of the printing plate P pulled out from the supply cassette 63 and the rear end of the printing plate P cut by the cutter 66 with a pair of holding claws (not shown).

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 a modulated laser beam 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 the 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. 25, 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 multicolor 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, the first plate cylinder 11 is rotated counterclockwise by the plate cylinder rotation mechanism 30, and the end of the printing plate P held on the first plate cylinder 11 is peeled off by the claw mechanism 73. The printing plate P is guided by the conveyor mechanism 69, and the discharge cassette 6
Discharge into 8. Then, after returning the first plate cylinder 11 to the first printing position, the second plate cylinder 12 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 printing plate P discharging process 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 insertion 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 multicolor printing apparatus in the above printing process will be described. FIGS. 27 to 32 are explanatory diagrams showing the printing operation of this multicolor printing apparatus. In these figures, for convenience of explanation, the length of the printing paper S and the peripheral lengths of the impression cylinder 15, 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 shorter than the circumferential length of the impression cylinder 15, the paper feed cylinder 16 and the paper discharge cylinder 17.

The printing operation described below is for the case where multicolor printing is performed on printing paper with four ink colors of yellow, magenta, cyan, and black, as described above. 27 to 32, for convenience of explanation,
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. 10B, 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
The black ink is supplied to 0a, the magenta ink is supplied to the ink supply device 20b, the cyan ink is supplied to the ink supply device 20c, and the yellow ink is supplied to the ink supply device 20d, as shown in FIG. 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 with only 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 edge 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. 28, the leading end of the printing paper S comes into contact with the end of the region on 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 insertion 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. 29, the leading end of the printing paper S
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. 30, 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 of 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 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. 32, the pair of chains 19 are conveyed together with the gripper of the paper discharge cylinder 17 to a position above the paper discharge unit 28 and discharged.

As described above, in this multicolor printing apparatus, the impression cylinder 15 has a diameter 1/1/2 of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
2, the first and second plate cylinders 11, 1
The impression cylinder 15 makes two revolutions while the second and first and second blanket cylinders 13, 14 make one revolution. Then, while the impression cylinder 15 rotates twice, printing of four colors of yellow, magenta, cyan, and black is performed on the printing paper S held on the outer peripheral portion of the impression cylinder 15. For this reason, by supplying new printing paper S from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice, it is possible to continuously execute printing of four colors.

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

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.

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.

In the above-described embodiment, the printing plate P having two image areas is mounted on the first and second plate cylinders and the first plate cylinder 11 moved to the first printing position.
And two dampening solution supply devices 21c and 21d are disposed around the periphery of the second plate cylinder 12 moved to the second printing position. The case has been described. However, a printing plate P having three or more image areas may be mounted on the first and second plate cylinders. In this case, three or more dampening solution supply devices are provided around the first printing cylinder 11 moved to the first printing position, and the second printing cylinder 12 moved to the second printing position. It is necessary to dispose three dampening water supply devices also on the outer peripheral portion.

[0153]

According to the first aspect of the present invention, a first and a second method for individually supplying dampening water to each of the first and second image areas to be printed with inks of different colors. Since the second dampening water supply device is provided, it is possible to prevent the occurrence of stains due to the attachment of ink of a different color from the ink to be originally supplied to each image area of the printing plate.
In addition, the first end of the dampening solution supply region by the first dampening solution supply device and the front end of the dampening solution supply region by the second dampening solution supply device overlap each other. A first image area and a second image area of the printing plate, since the second damping-water supply device has a watering roller moving mechanism for reciprocating the watering roller between the supply position and the retreat position. Can be prevented from being caused by the adhesion of the ink to the region between.

According to the second aspect of the present invention, the watering roller moving mechanism moves the watering roller between the supply position and the retracted position by using a cam follower that comes into contact with a cam provided on the plate cylinder. By using the rotation of the plate cylinder, the dampening roller can be brought into contact only with the required image area to supply dampening water by using the rotation of the plate cylinder. Can be

[Brief description of the drawings]

FIG. 1 is a schematic side view of a multicolor printing apparatus according to the present invention.

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

FIG. 11 is a schematic view of the dampening water supply device 21a as viewed from the front side.

FIG. 12 is a schematic view of the dampening water supply device 21a as viewed from the back side.

FIG. 13 is an explanatory diagram showing a connection state of an intermediate roller 245 and a water roller 243.

FIG. 14 is a schematic diagram showing a watering roller moving mechanism 256.

FIG. 15 is a schematic diagram showing a watering roller moving mechanism 256.

FIG. 16 is a schematic diagram showing a watering roller moving mechanism 256.

FIG. 17 is a side view showing a cam 241 attached to the first plate cylinder 11.

FIG. 18 shows image areas 67a and 67b, ink supply areas 275a and 275b, and dampening solution supply areas 276a and 276a.
It is explanatory drawing which shows the relationship with 76b.

FIG. 19 is a schematic view showing a contact pressure adjusting mechanism 257.

FIG. 20 is a schematic diagram showing a contact pressure adjusting mechanism 257.

FIG. 21 is a schematic view showing a gear retracting mechanism 258.

FIG. 22 is a schematic diagram showing a gear retracting mechanism 258.

FIG. 23 is a schematic diagram showing a mechanism for inserting the first blanket cylinder 13;

FIG. 24 is a block diagram illustrating a main electrical configuration of the multicolor printing apparatus.

FIG. 25 is a flowchart illustrating an outline of plate making and printing operations performed by the multicolor printing apparatus.

FIG. 26 is a flowchart showing a plate making process.

FIG. 27 is an explanatory diagram illustrating a printing operation of the multicolor printing apparatus.

FIG. 28 is an explanatory diagram illustrating a printing operation of the multicolor printing apparatus.

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

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

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

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

FIG. 33 is a configuration diagram illustrating an outline of a conventional multicolor 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 water 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 241 Cam 242 Water boat 243 Water roller 244 Water Forming roller 245 Intermediate roller 253 First arm 254 Second arm 256 Watering roller moving mechanism 257 Contact pressure adjusting mechanism 258 Gear retracting mechanism P Printing plate S Printing paper

Claims (2)

[Claims] 1. A plate cylinder for holding a printing plate on which first and second image areas to be printed with inks of different colors are formed on an outer peripheral portion thereof, and a dampening solution for the first image area. A first dampening solution supply device having a watering roller capable of reciprocatingly moving between a supply position in contact with the surface of the printing plate and a retracted position separated from the surface of the printing plate for supplying A watering roller capable of reciprocating between a supply position in contact with the surface of the printing plate for supplying dampening water to the second image area and a retracted position separated from the surface of the printing plate. A second dampening solution supply device; a rear end portion of a dampening solution supply region on the printing plate surface by the first dampening solution supply device; and a dampening solution supplied by the second dampening solution supply device. The first and second dampening solution supply devices so that the tip of the supply region overlaps with each other. A watering roller moving mechanism for reciprocating the watering roller between the supply position and the retreat position. 2. The multicolor printing apparatus according to claim 1, wherein the water transfer roller moving mechanism includes: a cam provided on the plate cylinder; and a water connection in the first and second dampening solution supply devices. An arm for supporting a roller, a cam follower for contacting the cam, and swinging each of the arms so that the watering rollers in the first and second dampening water supply devices are respectively supplied to the supply rollers. A multi-color printing apparatus, further comprising: an arm swinging mechanism that reciprocates between a position and the retracted position.