JPH0919996A - Offset press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating efficiency by providing an operating member for conducting the contact or separate operation of a water transfer roller and a dampening roller at a water rolling roller. SOLUTION: An operating lever 92 is rotated from the position II to the position I. Then, cams 47, 15, 26 are rotated counterclockwise, but since rolls 48, 31 remain riding on the cams 47, 26, a water transfer roller 42, a water rolling roller 33 and a dampening roller 25 are separate from each other. On the other hand, when the lever 92 is positioned at the position I, a roll 22 is dropped in the lower part 15b of the cam 15, and hence the roller 25 is brought into contact with a plate cylinder l. In this state, a printing plate can be mounted at the cylinder 1 while retaining the printing plate by the roller 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing machine, and more particularly to a contact / separation drive mechanism for each roller in a water supply section.

[0002]

2. Description of the Related Art Generally, printing is performed by supplying water and ink to a plate cylinder on which a printing plate is wound, transferring the ink to the blanket cylinder, and then conveying a printing paper between the blanket cylinder and the impression cylinder. Offset printing machines are widely known.

In such an offset printing machine, the water supply section includes a swimsuit roller in contact with the plate cylinder, a water roll roller in contact with the swimsuit roller, and a water transfer roller in contact with the water roll roller. The water transfer roller is in contact with the water transfer roller.

However, in Japanese Patent Application Laid-Open No. 1-280556, if both the water roll roller and the swim suit roller are lipophilic rollers, there is no problem even if the swim suit roller and the water roll roller are in constant contact with each other. When the roll roller is hydrophilic and the swimsuit roller is lipophilic, water is supplied to the water roll roller when, for example, the printing machine is driven to finish printing and start printing again. Before printing, the ink on the swimwear roller is transferred to the water roll roller, water may not adhere to the water roll roller, and water may not be able to be supplied. It had to be wiped, and the work was complicated.

Therefore, there has been proposed a structure in which the water overturning roller and the swimsuit roller can be brought into contact with and separated from each other so that the swimsuit roller is brought into contact after the water transfer roller is brought into contact with the water overturning roller. There is.

[0006]

However, in the offset printing machine as described above, the contact / separation drive of the swimsuit roller and the water transfer roller with respect to the water roll roller is performed by a separate and independent drive mechanism such as a lever or an air. The operation is complicated and the structure is complicated because the swimsuit roller is brought into and out of contact with the water roll roller and the water transfer roller is brought into and out of contact with the water roll roller by operating the cylinder and the hydraulic cylinder, respectively. There was a point.

The present invention has been made in view of the above-mentioned problems, and provides an offset printing machine capable of performing a contacting / separating operation of a water transfer roller and a swimsuit roller with respect to a water roll roller with a single operating member. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plate cylinder around which a printing plate is wound, a swimsuit roller that is provided so as to be able to come in contact with and separate from the plate cylinder, and that is made of an elastic body, and a swimsuit roller that comes into contact with the swimsuit roller are provided. The water tumbling roller which is provided so as to be separable and which has been subjected to a hydrophilic surface treatment, the water tumbling roller which is provided so as to be able to come into contact with and separate from the water tumbling roller, and which is formed of an elastic body, and the water tumbling roller described above. A first contact / separation drive mechanism for performing contact / separation drive of the water transfer roller, a second contact / separation drive mechanism for contact / separation drive of the swimsuit roller with respect to the water roll roller, and a contact / separation drive of the swimsuit roller with respect to the plate cylinder. A third contact / separation drive mechanism for carrying out the above, an operation member for operating the first contact / separation drive mechanism, the second contact / separation drive mechanism, and the third contact / separation drive mechanism; When winding the When the swimsuit roller is moved away from the water roll roller so that the swimsuit roller is kept in contact with the plate cylinder and the printing plate is wound around the plate cylinder; An inking roller is provided, and the inking roller is driven to move toward and away from the plate cylinder by a third contacting and separating drive mechanism.

At the start of printing, the operation member is operated to operate the first contact / separation drive mechanism so that the water transfer roller comes into contact with the water overturning roller. As a result, water is supplied from the water transfer roller to the water tumbling roller. After that, the second contact / separation drive mechanism operates and the swimsuit roller contacts the water roll roller. At this time, since the water has already been supplied from the water transfer roller to the water tumbling roller, the ink attached to the swimsuit roller does not adhere to the water tumbling roller, and the water can be stably supplied. Further, the third contact / separation drive mechanism operates, and the swimsuit roller contacts the plate cylinder. With this, by inserting only the operating member into the body part of the water section roller,
It can be done and water is supplied to the plate cylinder. Further, by operating the third contact / separation drive mechanism, the inking roller can be brought into contact with or separated from the plate cylinder.

Further, at the time of plate change, the first contact / separation drive mechanism and the second contact / separation drive mechanism do not operate, and the water transfer roller and the water roll roller are separated from each other, and the water roll roller and the swimsuit roller are separated from each other. The third contact / separation drive mechanism operates and the swimsuit roller contacts the plate cylinder. In this state, plate work is performed. At this time, since the swimsuit roller and the water roll roller are separated from each other, the ink is not transferred to the water roll roller, and good printing can be performed immediately after the printing plate is applied.

[0011]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic sectional view of an offset printing machine according to the present invention. In the figure, reference numeral 1 is a plate cylinder, and a water supply unit 2 and an ink supply unit 3 are in contact with the plate cylinder 1. Further, the blanket cylinder 4 is in contact with the plate cylinder 1, and the blanket cylinder 4 is in contact with the impression cylinder 5. And
Printing is performed by passing the printing paper 6 between the blanket cylinder 4 and the impression cylinder 5.

FIG. 2 is a partially enlarged view of a part of the plate cylinder 1, the water supply unit 2 and the ink supply unit 3, and the reference numeral 7 in the drawing indicates an operation shaft. 3 to 5 respectively show various mechanisms of the water supply unit 2 on a cross section taken along the axial direction of the operation shaft 7. As is clear from FIGS. 2 and 3, the operation shaft 7 is horizontally stretched between a pair of ink frames 16 which are parallel to each other and perpendicular to each other, and an operation lever 92 is attached to one end thereof (FIG. 1). reference). Also,
Collars 8 and 9 are coaxially and integrally rotatably attached to the operation shaft 7 so as to correspond to the respective ink frames 16. Three arms 8a, 8b, 8c are attached to the collar 8, and these three arms 8a, 8b, 8c are the links 1
1, 12 and 13 are rotatably connected respectively. On the other hand, the collar 9 is provided with two arms 9a and 9b,
These arms 9a and 9b are rotatably connected to other links 11 and 12, respectively. Link 11 is removable cam 1
5 is rotatably connected. It should be noted that FIG. 2 shows only the detachable cam 15 on one ink frame 16 side.

As shown in FIGS. 2 and 6, a plate cylinder shaft 14 is provided between the ink frames 16, 16 and the plate cylinder 1 is coaxially and rotatably supported on the plate cylinder shaft 14. The detachable cams 15 are attached to both ends of the plate cylinder shaft 14. Each attachment / detachment cam 15 is rotatable with respect to the plate cylinder shaft 14 within an angle range limited by the elongated hole 15a. That is, the end plate 16a is attached to the ink frame 16 by screwing the bolts 16c and 16c into the two support rods 16b and 16b fixed to the ink frame 16. Then, the bolts 16c are inserted into the elongated holes 15a, whereby the rotation angle of the detachable cam 15 is limited as described above.

As shown in FIGS. 2, 4 and 7, each ink frame 16 is provided with a mounting hole 16d, and a holder 17 is inserted into the mounting hole 16d. The size of the mounting hole 16d will be described later. A stop collar 18 is connected to each holder 17, and thereby each holder 17 is prevented from coming off from the ink frame 16 in the axial direction (left and right direction in FIG. 4). The holder 17 has a pin 19
Is attached, and one end of an arm 20 is rotatably connected to the pin 19. Further, the other end of the arm 20 is supported by a support shaft 21 that is stretched between the ink frames 16, 16. Further, each pin 19 is provided with a roller 22 capable of contacting the detachable cam 15.

As shown in FIGS. 4 and 7, the arm 20
The coil spring 23 is connected to one end thereof, and the other end of the coil spring 23 is connected to the ink frame 16. The force of the coil spring 23 urges the roller 22 in a direction in which it comes into contact with the removable cam 15. A roller shaft 24 is provided between the two holders 17, and a swimsuit roller 25 is coaxially provided on the roller shaft 24. The outer circumference of the swimsuit roller 25 has elasticity. To get such elasticity,
The outer circumference of the swimsuit roller 25 is made of rubber, for example. Further, the holder 17 has a mounting hole 16d for the ink frame 16.
Is loosely inserted against. That is, the mounting hole 16d
The diameter of the swimsuit roller 25 is set to be larger than that of the insertion portion 17a of the holder 17 for that.
It is possible to approach and separate from. Then, by the force of the coil spring 23, the swimsuit roller 25 is urged to come into contact with the plate cylinder 1.

As shown in FIGS. 3 and 7, a cam 26 is rotatably connected to the other end of the link 13, and the cam 26 is
Is rotatable about a pin 27 attached to the ink frame 16. The water throw-in roll roller 28 is in contact with the swimsuit roller 25. In addition, the ink frame 16,
A shaft 29 is rotatably provided around the axis between 16 and the first arm 3 is provided at one end of the shaft 29.
0 is fixed. A roller 31 is provided at the tip of the first arm 30, and the roller 31 can contact the cam 26 according to the rotation of the cam 26. Further, second arms 32, 32 are arranged on the inner surface side of each ink frame 16, and the second arms 32 are attached to the shaft 29 so as to be integrally rotatable. The second arm 32 can come into contact with the cutout portion 18 a of the stop collar 18.

Since the holder 17 is loosely inserted in the mounting hole 16d of the ink frame 16, the swimsuit roller 25 can be brought into contact with and separated from the water roll roller 33 as well. In FIG. 7, when the cam 26 rotates counterclockwise around the pin 27, the cam 26 comes into contact with the roller 31, whereby the first arm 30 is pushed and the shaft 29 rotates counterclockwise around the axis. Rotate. As a result, the second arm 32 rotates so as to come into contact with the cutout portion 18 a of the stop collar 18, and the swimsuit roller 25 is separated from the water roll roller 33. The water overturning roller 33 has hydrophilicity on its outer surface. In order to obtain such properties, the water roll roller 3
The outer surface of 3 is plated with chrome, for example.

As shown in FIGS. 4 and 7, the water roll roller 33 is supported by slide bearings 33b and 33b held by holders 33a and 33a (not shown in FIG. 7).
The holders 33a and 33a are attached to the ink frame 16. As a result, the water roll roller 33 can slide in the axial direction while contacting the swimsuit roller 25 as shown by imaginary lines L1 and L2 in FIG. Such a sliding operation is effective for making the thickness of the water film surrounding the swimsuit roller 25 uniform.

The water roll roller 33 is connected to an engaging member 33d at one end thereof, and the engaging member 33d is engaged with a reciprocating drive mechanism (not shown) for reciprocating the water roll roller 33 in the axial direction. . The two rollers 25, 33 are
Coil spring 3 suspended between holders 17a and 33a
The forces of 4, 34 are urged to contact each other.
The rollers 25, 33 are respectively coupled with gears G1, G2 for transmitting rotational movement between the rollers 25, 33.

As shown in FIGS. 5 and 8, a water frame 36 is rotatably attached to the ink frame 16 via a fulcrum pin 35. A water source roller 37 is provided concentrically with the fulcrum pin 35. This Mizumoto roller 37
Is immersed in the water in the water boat 54 as shown in FIG. FIG.
And as shown in FIG. 9, the water frame 36 has pins 38,
A pair of arms 39 </ b> A and 39 </ b> B are provided to face each other via 38. A metering roller 41 is stretched between the arms 39A and 39A, and a water transfer roller 42 is stretched between the arms 39B and 39B. Each roller 41,
42 is held by a holding member 40 fixed to each arm 39A, 39B with a bolt.

Arms 39A, 39 centering around the pin 38
By the swinging motion of B, the metering roller 41 and the water transfer roller 42 can be brought into contact with and separated from the water source roller 37. Also,
Coil spring 43 provided between arms 39A and 39B
As a result, the two rollers 41 and 42 are urged to come into contact with the water source roller 37. The arms 39A and 39B come into contact with the screw-shaped pressure adjusting members 44A and 44B, respectively. The pressure adjusting members 44A and 44B are supported by the water frame 36 such that their positions can be adjusted in the respective axial directions. Pressure adjusting member 44
The pressing force of each roller 41, 42 against the water source roller 37 is adjusted according to the position of A, 44B.

The water transfer roller 42 can be brought into contact with or separated from the water horizontal roller 33 as the water frame 36 rotates about the fulcrum pin 35. Further, the water transfer roller 42 is urged to come into contact with the water tumbling roller 33 by the force of the coil springs 45, 45 provided between the water frame 36 and the ink frame 16 (see FIG. 5).

As shown in FIGS. 3, 5 and 8, each ink frame 16 is provided with a cam 47 rotatable about a pin 46, and each cam 47 has each cam 12 provided with each link 12.
Is rotatably connected. When the cam 47 rotates about the pin 46 in the counterclockwise direction in FIG. 8, the cam 47 comes into contact with the roller 48 provided on the water frame 36. In this state, the water frame 36 cannot rotate counterclockwise in FIG. 8, and as a result, the water transfer roller 42 is held at a position away from the water tumbling roller 33.

The shaft 4 is provided between the water frames 36, 36.
9, and cam plates 50 are attached to both ends thereof so as to be integrally rotatable. A lever 51 for rotating the shaft 49 is fixed to the shaft end of the shaft 49. When the cam plate 50 is rotated to come into contact with the pin 52 fixed to the ink frame 16, the water frame 3
6 rotates clockwise around the fulcrum pin 35 in FIG.
Further, the water frame 36 is formed with a latch portion 36a.

As shown in FIGS. 5 and 9, the shaft 4
Cams 53 and 53 are provided on the plate 9 so as to correspond to the pairs of arms 39A and 39B, respectively. The cams 53 can come into contact with and separate from the arms 39A and 39B as the shaft 49 rotates. When the cam 53 hits the arms 39A and 39B, the arm 39 is resisted against the force of the coil spring 43.
A and 39B rotate opposite to each other, whereby the metering roller 41 and the water transfer roller 42 are separated from the water source roller 37. As shown in FIG. 5, the water source roller 37 and the swimsuit roller 25 are respectively coupled to gears G3 and G4 for transmitting rotational movement therebetween. Mizumoto roller 37
Is rotationally driven by a motor (not shown).

FIG. 10 is a partially enlarged sectional view of the ink supply section 3. A detachable lever 56 is attached to the shaft 55, and an arm 57 is attached to the shaft 55. Arm 5
7 is formed with a notch 57a, and a pin 60 of a bracket 59 provided on the ink frame 16 via a pin 58 is engaged therewith. The plate cylinder 1 (see FIG. 1) is in contact with an inking roller 61, and the inking roller 61 is in contact with an ink throwing roller 62. The delivery roller 63 is in contact with the ink delivery roller 62, and the support portion 62 of the ink delivery roller 62 and the delivery roller 63 is provided.
The a and 63a are engaged in the groove 59a formed in the bracket 59. Further, the bracket 59 is provided with a pressing member 65 which is pressed by a spring 64, and the pressing member 65 presses the supporting portion 63 a of the transfer roller 63, so that the transfer roller 63 always contacts the ink throwing roller 62. I am letting you. Further, the cam plate 66 is attached to the bracket 59.
The bracket 59 is rotated around the pin 58, and when the water frame 36 is rotated counterclockwise, the water frame 36 is supported by contacting the cam plate 66. The water transfer roller 42 is configured so as not to contact the water overturning roller 33. In addition, between the bracket 59 and the ink frame 16,
A spring 67 is interposed, and the urging force of the spring 67 urges the bracket 59 counterclockwise in FIG. 10 about the pin 58. On the other hand, a switch cam 68 is attached to the shaft 55.
The switch 69 is configured to be turned on and off by 8.

As shown in FIG. 2, a roller-like cam follower 94 is provided on the cam surface of the removable cam 15, and the cam follower 94 is rotatably connected to one ends of the two arms 93A and 93B. The other end of the arm 93A is connected to the central shaft 61a of the inking roller 61, and the other end of the arm 93B is rotatably connected to the ink frame 16 via a pin 93C. Therefore, when the operation shaft 7 rotates,
The cam follower 94 moves up and down so as to bring the inking roller 61 into and out of contact with the plate cylinder 1.

As shown in FIGS. 3 and 11, the collar 9
A positioning cam 70 having a wavy cam surface 70a is attached to the shaft, and a collar 71 having three switch cams 71a, 71b, 71c is attached to the shaft end of the operation shaft 7. The cam surface 70 a of the cam 70 contacts a roller 74 attached to one end of the lever 73. The lever 73 is attached to the ink frame 16 via the pin 73a,
It can be rotated around the pin 73a. Lever 73
The other end of the coil spring 75 is connected to one end of the coil spring 75, and the other end of the coil spring 75 is connected to the ink frame 16. Therefore, the lever 73 is biased to rotate clockwise about the pin 73a in FIG.
4 is pressed against the cam surface 70a and stops at any of positions I to VIII on the cam surface 70a as the operation shaft 7 rotates. By engaging the roller 74 with the cam surface 70a of the cam 70, the operation lever 92 is positioned at any of the positions I to VIII. Positions I to VIII in FIG. 11 correspond to positions I to VIII of the operating lever 92 shown in FIG. 1, respectively.

As shown in FIG. 3, the switch cam 71a,
71b and 71c correspond to the switches 72a, 72b and 72c, respectively.
c is a switch cam 71a, as the operation shaft 7 rotates.
It is turned on / off by 71b and 71c, respectively. The controller (not shown) of the offset printing machine uses switches 72a, 72b, 72c for several devices and mechanisms in the offset printing machine, such as a motor for rotating the water roller 37, a suction pump of a suction foot, and a paper feeding mechanism. Control according to the output signal of. Switch 72
The a, 72b, and 72c are supported by a bracket 76 fixed to the ink frame 16.

In the above-mentioned structure, the cams 15, 26 and 47 rotate as the operating shaft 7 rotates. And
The swimsuit roller 25 comes into contact with and separates from the plate cylinder 1 as the cam 15 rotates. Further, the roller 25 comes into contact with and separates from the water roll roller 33 as the second arm 32 rotates, and the second arm 32 rotates as the cam 26 rotates. further,
The water transfer roller 42 comes into contact with and separates from the water horizontal roller 33 as the water frame 36 rotates about the fulcrum pin 35, and the water frame 36 rotates as the cam 47 rotates. Therefore, the contact / separation operation of the rollers 25 and 42 with respect to the plate cylinder 1 and the water roll roller 33 can be controlled by operating the common operation lever 92. Further, for example, cams 15 and 2
By adjusting the contours 6 and 47, the timing of each contact / separation operation can be set appropriately. A suitable adjustment example is described below.

In the offset printing machine constructed as described above, a procedure for carrying out cylinder insertion will be described with reference to FIG. Note that positions I to VIII in FIG. 12 are positions I in FIG.
~ Corresponds to VIII respectively.

In order to insert the body, first, the operation lever 9
Rotate 2 from position II to III. In response to this rotation, the cam 47 rotates in the clockwise direction in FIG. 8 around the pin 46 and is separated from the roller 48, and the water frame 36 is rotated in the counterclockwise direction around the fulcrum pin 35 by the force of the coil spring 45. Rotate. As a result, the water transfer roller 42 becomes the water overturning roller 3
3, the water in the water boat 54 is supplied from the water source roller 37 to the water tumbling roller 33 via the water transfer roller 42.

Next, the operating lever 92 is moved from position III to position IV.
Rotate to. Then, the cam 26 rotates around the pin 27 in the clockwise direction in FIG. 7 and separates from the roller 31. Therefore, the first arm 30, the shaft 29, and the second arm 3
2 can freely rotate in the clockwise direction in FIG. 7 about the axis of the shaft 29, so that the swimsuit roller 2
5 moves by the force of the coil spring 34 so as to come into contact with the water overturning roller 33. As a result, water is transferred from the water overturning roller 33 to the swimsuit roller 25. At this time, the water overturning roller 33 is reciprocally driven in the axial direction in order to make the thickness of the water film on the swimsuit roller 25 uniform.

When the operating lever 92 is further rotated from the position IV to the position V, the cam 15 rotates around the axis of the plate cylinder shaft 14 in the clockwise direction in FIG. , So that the swimsuit roller 25 remains in contact with the water roll roller 33 and the plate cylinder 1
Contact with. As a result, water is supplied to the plate cylinder 1.

After supplying water, move the operating lever 92 from the position V
Rotate to VI. Then, the inking roller 61 follows the operation of the arms 93A and 93B and the cam follower 94.
2 (see FIG. 2) contacts the plate cylinder 1, which supplies ink to the printing plate on the plate cylinder 1.

Then, the operating lever 92 is moved from position VI to position VII.
When rotated to, the plate cylinder 1 comes into contact with the blanket cylinder 4 (see FIG. 1) and the image is transferred to the outer surface of the blanket cylinder 4. Further, when the operation lever 92 is rotated from the position VII to the position VIII, the printing paper 6 is supplied between the blanket cylinder 4 and the impression cylinder 5, and the image is transferred to the printing paper 6.

As described above, in the present embodiment, the swimsuit roller 25 and the water roll roller 33 are configured so that they can be brought into contact with and separated from each other, and the water transfer roller 42 and the water roll roller 33 are separated when putting the body into the body. Since the swimsuit roller 25 and the water overturning roller 33 contact each other after the outer surfaces of the water overturning rollers 33 are in contact with each other and are covered with water, the ink on the swimwear roller 25 does not adhere to the water overturning roller 33. Water is surely supplied to the plate cylinder 1.

Next, the operation of mounting the printing plate on the plate cylinder 1 will be described. In this work, position the operation lever 92
Rotate from II to I. Then, each cam 47, 15,
26 rotates counterclockwise in FIG. 2, but during this time, the rollers 48 and 31 remain on the cams 47 and 26, respectively.
3 and the swimsuit roller 25 are spaced apart from each other as shown in FIG. On the other hand, when the operating lever 92 is positioned at the position I, the roller 22 moves to the lower portion 15 of the cam 15.
b (see FIG. 2), for which swimsuit roller 25
Contacts the plate cylinder 1. In this state, the printing plate can be attached to the plate cylinder 1 while being pressed by the swimsuit roller 25.
At this time, since the swimsuit roller 25 and the water overturning roller 33 are separated from each other, ink does not adhere to the water overturning roller 33. Therefore, it is not necessary to wipe the water roll roller 33 after the printing plate is mounted on the plate cylinder 1, and therefore the working efficiency can be improved.

In the above-described embodiment, the operation shaft 7 can be rotated by a motor or an actuator equivalent thereto instead of manually operating the operation lever 92. Less than,
Another embodiment in which the operating shaft 7 is rotated by an actuator will be described with reference to FIG. Note that, in the following, the description of the common parts with the above will be omitted.

As shown in FIG. 13, the offset printing machine has a solenoid 76 for advancing. This solenoid 76
Is to drive the rod 76a in the axial direction by turning on and off an electromagnet (not shown) incorporated therein. The rod 76a is coaxially connected to one end of the link 77, and the other end of the link 77 is rotatably connected to the lever 79 via the pin 77a. The lever 79 is rotatably attached to the ink frame 16 (see FIGS. 1 to 3) via a pin 78. Further, the offset printing machine is provided with a solenoid 80 for retreat having the same configuration as the solenoid 76, and a rod 86 a thereof is coaxially connected to one end of a link 81. The other end of the link 81 is connected to the lever 83 via the pin 81a. The lever 83 is rotatably attached to the ink frame 16 via a pin 82.

A coil spring 84 is provided between the levers 79 and 83.
, Which biases the lever 79 to rotate in the counterclockwise direction in FIG. 13 about the pin 78, and the lever 83 in the clockwise direction about the pin 82.
The rotation of these levers 79 and 83 is caused by the pins 85a and 85b.
Limited by.

An arm 86 is rotatably mounted on the operation shaft 7. The arm 86 is provided with feed claws 87, 88 rotatable around the pins 86a, 86b. The feed pawl 87 is biased by a spring (not shown) to rotate counterclockwise about the pin 86a, and the feed pawl 88 is biased to rotate clockwise about the pin 86b by another spring (not shown). It The feed claws 87 and 88 are provided with pins 87a and 88a, respectively.
8a contacts levers 79 and 83, respectively. This limits the rotation of the feed pawls 87, 88.

A ratchet wheel 89 is mounted on the operating shaft 7.
Are rotatably attached together. The arm 86 is rotatably connected to one end of the link 90 via a pin 90a, and the other end of the link 90 is connected to the output shaft 9 of the drive motor 91.
It is rotatably connected via 1a and a pin 91b. Therefore, the arm 86 swings around the shaft 7 by a predetermined angle each time the output shaft 91a makes one rotation. Solenoids 76, 80
The drive motor 91 can be attached to the ink frame 16.

In such a structure, the operation shaft 7 is shown in FIG.
When rotating in the counterclockwise direction of 3, the solenoid 76 is driven so as to pull the link 77 downward. This causes the lever 79 to rotate around the pin 78 in the clockwise direction in FIG. Then, the feed pawl 87 rotates around the pin 86 a in the counterclockwise direction and meshes with the tooth portion 89 a of the ratchet wheel 89. When the drive motor 91 is operated in this state, the arm 86 swings around the operation shaft 7 via the link 90, and in response thereto, the ratchet wheel 89 moves counterclockwise by the feed pawl 87 together with the operation shaft 7. It is driven to rotate.

On the other hand, when the operation shaft 7 is rotated clockwise in FIG. 13, the solenoid 80 is driven so as to pull the link 81 downward. As a result, the lever 83 rotates around the pin 82 in the counterclockwise direction in FIG. Then, the feed claw 88 rotates clockwise around the pin 86b and meshes with the tooth portion 89b of the ratchet wheel 89. When the drive motor 91 is operated in this state, the arm 86 swings around the operation shaft 7 via the link 90,
The ratchet wheel 89 moves together with the operating shaft 7 and the feed pawl 88.
Is driven to rotate clockwise by.

By combining the above driving mechanism, it can be used in a multicolor printing machine. That is, in the case of a multicolor offset printing machine, the mechanism of FIG. 13 can be provided for each printing unit corresponding to each color. Drive motor 91
Alternatively, the operation shaft 7 may be driven by another actuator of the offset printing machine or a rotary member, for example, a drive motor of the water source roller 37. The mounting angles of the arms 8a, 8b, 8c with respect to the operation shaft 7, the detachable cams 15,
The cam shapes of the cam 26 and the cam 47 are set appropriately.

[0047]

As described above, according to the present invention, the first contact / separation drive mechanism, the second contact / separation drive mechanism, and the third contact / separation drive mechanism can be operated by one operating member. On the other hand, although the swimsuit roller and the water transfer roller have a structure capable of being brought into contact with and separated from each other, the mechanism is simple and the operation efficiency can be improved. Further, when the plate is applied, the swimsuit roller can be brought into contact with the plate cylinder in a state of being separated from the water roll roller, so that the ink attached to the swimsuit roller is not transferred to the water roll roller. Good printing can be performed. Further, since the second contact / separation drive mechanism and the third contact / separation drive mechanism can be operated by one operating member, the operation is easy and the operation efficiency of the plate hanging operation can be improved. Further, by operating the third contact / separation drive mechanism, the contact / separation drive of the swimsuit roller to / from the plate cylinder is performed, so that the operation efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of an offset printing machine according to the present invention.

FIG. 2 is a partially enlarged view of a part of a plate cylinder, a water supply section, and an ink supply section.

3 is a transverse cross-sectional view showing a configuration for driving each cam in response to an operation of an operation lever in the offset printing machine of FIG.

FIG. 4 is a cross-sectional view showing a configuration for supporting a swimsuit roller and a water roll roller in the offset printing machine of FIG.

5 is a cross-sectional view showing a configuration for supporting a water source roller, a water transfer roller, and a metering roller in the offset printing machine of FIG.

6 is a partial cross-sectional view showing a configuration for supporting a plate cylinder in the offset printing machine of FIG.

FIG. 7 is a partial enlarged view of a part of the water supply unit.

FIG. 8 is a partial enlarged view of a part of the water supply unit.

FIG. 9 is a partially enlarged view of a part of the water supply unit.

FIG. 10 is a partially enlarged sectional view of an ink supply unit.

FIG. 11 is a view showing a positioning mechanism portion of an operation shaft.

FIG. 12 is an explanatory diagram showing a contact / separation state between rollers.

FIG. 13 is a diagram showing a drive mechanism portion of an operation shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plate cylinder 11 ... Link (3rd contact / separation drive mechanism) 12 ... Link (1st contact / separation drive mechanism) 13 ... Link (2nd contact / separation drive mechanism) 15 ... Attachment / detachment cam (3rd contact / separation drive mechanism) 16 Ink frame 17 Holder (third contact / separation drive mechanism) 18 ... Stop collar (second contact / separation drive mechanism) 22 ... Roller (third contact / separation drive mechanism) 25 ... Swimsuit roller 26 ... Cam (second contact / separation drive mechanism) 29) Shaft (second contact / separation drive mechanism) 30 ... First arm (second contact / separation drive mechanism) 32 ... Second arm (second contact / separation drive mechanism) 33 ... Water roll roller 42 ... Water transfer roller 47 ... Cam (first contact / separation drive mechanism) 48 ... Roller (first contact / separation drive mechanism) 92 ... Operation lever (operation member)

Claims (3)

[Claims] 1. A plate cylinder around which a printing plate is wound, a swimsuit roller that is provided so as to be able to come into contact with and separate from the edition cylinder, and a swimsuit roller that is formed of an elastic body, and that is provided so as to be able to come into contact with and separate from the swimsuit roller and be hydrophilic. Of the water overturning roller that has been subjected to a hydrophilic surface treatment, and a water transfer roller that is provided so as to be able to come into contact with and separate from the water overturning roller, and that is made of an elastic body, and that the water transfer roller is brought into or out of contact with the water transverse roller. A first contact / separation drive mechanism, a second contact / separation drive mechanism that drives the swimsuit roller to and from the water roll roller, and a third contact / separation drive mechanism that drives the swimsuit roller to and from the plate cylinder. When,
An offset printing machine comprising: an operating member that operates the first contact / separation drive mechanism, the second contact / separation drive mechanism, and the third contact / separation drive mechanism. 2. When the printing plate is wound around the plate cylinder, the operating member is operated so that the swimsuit roller is separated from the water roll roller and the swimsuit roller is kept in contact with the plate cylinder. The offset printing machine according to claim 1, wherein the printing plate is wound around the plate cylinder. 3. An inking roller is provided on the plate cylinder so that it can come into contact with and separate from the plate cylinder, and the inking roller is driven by a third contact-separation drive mechanism.
3. The offset printing machine according to claim 1, wherein the offset printing machine is driven to approach and separate from the plate cylinder.