JP4590445B2 - Offset printing machine and operation control method thereof - Google Patents

Description

  The present invention relates to an offset printing press and an operation control method thereof.

The offset printing press is provided with an impression cylinder and a rubber cylinder arranged so as to sandwich the supply line of the substrate to be printed, the plate cylinder is circumscribed by the rubber cylinder, and the ink supply device's roller and the water supply device's water roller are connected to the plate cylinder. The ink of a predetermined concentration is supplied by supplying ink from the ink supply device and water from the water supply device to the plate attached to the outer peripheral surface of the plate cylinder. Is transferred to a blanket provided on the outer peripheral surface of the rubber cylinder, and transferred from the rubber cylinder to a printed material in a backup state on the impression cylinder.
As described above, many printing presses having a plurality of cylinders for printing on a printing material have a mechanism for separating both the ink supply device and the water supply device from the plate cylinder for maintenance during non-printing. ing. As a method of separating the ink supply device and the water supply device, a method of separating the ink supply device and the water supply device along the axial direction of the plate cylinder (for example, see Patent Document 1) and a method of separating the ink supply device and the water supply device in the radial direction of the plate cylinder (for example, Patent Document 2) See).

In addition, as a means of operation, the ink supply device and the water supply device are separated from the plate cylinder as described above for the reason that the ink supply to the plate cylinder is stopped, such as when it takes time for maintenance or a break. was there.
JP 2007-38675 A JP 2007-21858 A

As described above, the structure in which the ink supply device and the water supply device are separated from the plate cylinder is large and complicated because each of these devices has a large number of rollers. This greatly affects the configuration of the system and causes various inconveniences regarding installation and cost.
Further, when the ink supply device is separated from the plate cylinder for the purpose of stopping the ink supply to the plate cylinder, the water supply device is also separated from the plate cylinder at the same time, so that it is impossible to supply water to the plate cylinder. For this reason, the ink adhering to the plate cylinder dries, and there is a problem that it takes time to remove and clean the dried ink the next time printing is resumed.

  The present invention has been made in view of the above circumstances, and can suppress the increase in size and complexity of the structure of the printing press as a whole, and also stops ink supply to the plate cylinder during maintenance or during breaks. An object of the present invention is to provide an offset printing machine and an operation control method thereof that can easily and quickly resume the next printing.

In order to achieve the above object, the present invention has taken the following measures.
That is, the offset printing press 1 according to the present invention includes an impression cylinder 5 and a rubber cylinder 6 arranged so as to sandwich a supply line of the substrate W, and a plate cylinder 7 is circumscribed by the rubber cylinder 6 and an ink supply device 10 is provided. The form roller 12 and the water roller 13 of the water supply device 11 are provided so as to circumscribe the plate cylinder 7, and the plate cylinder 7 is circumscribed simultaneously with the rubber cylinder 6 and the form roller 12 for printing. To the idling position in which the rubber cylinder 6 and the form roller 12 are separated from each other at the same time and idle in a non-printing state, and the water roller 13 of the water supply device 11 is moved to the water roller 13. set to be follow the movement of the plate cylinder 7 so as to circumscribe the plate cylinder 7 located and the printing position and the idling position by circumferential movement concentrically around the water supply source roller 62 supplies water Is, the water supply device 11 includes tracking means 65 which produces a spring force in a direction to press the water roller 13 to the plate cylinder 7 is provided.

In this way, the plate cylinder 7 is configured to be moved from the printing position to the idling position as necessary, and the ink supply device 10 does not need to be moved, so that an increase in size and complexity of the structure can be suppressed.
Moreover, the water roller 13 follows the movement of the plate cylinder 7 by moving concentrically around a water supply roller 62 that supplies water to the water roller 13, and the following means 65 is provided with a water roller. A spring force is generated in a direction in which 13 is pressed against the plate cylinder 7. Thus, after moving the plate cylinder 7 to the idle position (a state of being away from the form roller 12 of the ink supply device 10) also, since the water roller 13 of the water supply device 11 holds the bounding state between the plate cylinder 7, the plate The barrel 7 can always maintain a moderate wet state. Therefore, the ink adhering to the plate cylinder 7 is not dried during idling, and there is an advantage that the next printing can be resumed easily and quickly.

A bearing case 21 that rotatably holds the rotating shaft 7a of the plate cylinder 7 is rotatably fitted in a case housing 23 provided in the apparatus frame 22 so that the position of the plate cylinder 7 can be moved. Therefore, it is preferable that the rotation axis 7a of the plate cylinder 7 and the rotation axis P2 of the bearing case 21 with respect to the case housing 23 are eccentric from each other.

Employing such a configuration is preferable because the structure can be made compact and simple.
On the other hand, the operation control method according to the present invention supplies the printing material W between the impression cylinder 5 and the rubber cylinder 6 and applies the form roller of the ink supply device 10 to the plate cylinder 7 circumscribing the rubber cylinder 6. 12 relates to an offset printing machine that supplies ink from water 12 and water from a water roller 13 of a water supply device 11 to print a printing material W. The plate cylinder 7 is moved from the rubber cylinder 6 and the form roller 12 during non-printing. At the same time , the water roller 13 is concentrically moved around the water supply roller 62 that supplies water to the water roller 13, thereby bringing the water supply roller 62, the water roller 13, and the plate cylinder 7 into a circumscribed state. Along with the idle rotation of the plate cylinder 7 that is maintained and separated from the rubber cylinder 6 and the form roller 12 at a lower speed than the rotation speed during printing, the water roller 13 that circumscribes the plate cylinder 7 also rotates. Slow , It is maintained by the water roller 13 in a state for supplying the water in the water supply source roller 62 to the plate cylinder 7 in the idle rotation.

In this way, even during non-printing, the plate cylinder 7 is in contact with the water roller 13 of the water supply device 11 to supply water . In addition, since the rotation of the water roller 13 that circumscribes the plate cylinder 7 is also reduced as the plate cylinder 7 is idled at a lower speed than the rotation speed during printing, the water roller 13 to the plate cylinder 7 are also rotated at a low speed. While the amount of water supplied to the plate cylinder 7 is suppressed to the minimum necessary , the plate cylinder 7 can maintain an appropriate wet state, and the ink adhering to the plate cylinder 7 can be prevented from drying. Therefore, there is an advantage that the next printing can be resumed easily and quickly.
When the plate cylinder 7 is idle-rotated at a lower speed than the printing speed at the time of non-printing, and when the non-printing state is changed to the printing state, the plate cylinder 7 is simultaneously circumscribed by the rubber cylinder 6 and the form roller 12. What is necessary is just to control so that it may be idling at a higher speed than idle rotation.

  By doing so, the rotation of the water roller 13 circumscribing the plate cylinder 7 at the time of idling can also be slowed, and accordingly, the amount of water supplied from the water roller 13 to the plate cylinder 7 is minimized. Will be able to control. In a state where the plate cylinder 7 is simultaneously circumscribed by the rubber cylinder 6 and the dosing roller 12, the plate cylinder 7 is returned to a high speed rotation, and the idle operation is temporarily performed to adjust the condition and resume printing.

  The offset printing press and the operation control method thereof according to the present invention can suppress the increase in size and complexity of the entire printing press, and can also be used when ink supply to the plate cylinder is stopped during maintenance or breaks. The next printing can be resumed easily and quickly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 8 show an embodiment of an offset printing machine 1 according to the present invention. This offset printing press 1 is called a so-called small intermittent offset printing press that is capable of not only moving forward but also stopping and backing when the substrate W is supplied. For example, as shown in FIG. As described above, a plurality of units are installed along the supply line of the substrate W and different colors are assigned to configure a multicolor printing process, or only one unit is installed to configure a single color printing process.

As shown in FIG. 3, the offset printing machine 1 is provided with a pressure cylinder 5 and a rubber cylinder 6 in an arrangement that sandwiches a supply line of the substrate W, and a plate cylinder 7 is circumscribed by the rubber cylinder 6. An ink supply device 10 and a water supply device 11 are provided around the plate cylinder 7.
The impression cylinder 5, the plate cylinder 7 and the rubber cylinder 6 have their rotation shafts 5 a, 6 a, 7 a parallel to each other, the plate cylinder 7 and the rubber cylinder 6 are in a reverse rotation relationship with each other, and the rubber cylinder 6 and the impression cylinder 5 Are rotated in conjunction with each other so that they are in a reverse rotation relationship with each other.
On the outer peripheral surface of the plate cylinder 7, a plate having an image line portion (a portion to be a printing surface) and a non-image line portion (portion on which ink is not placed) formed between the image line portions is provided. A blanket made of leather, rubber or the like is provided on the outer peripheral surface.

The ink supply device 10 has a plurality of (four in the illustrated example) rotating rollers 12 that rotate while circumscribing the plate cylinder 7, and the water supply device 11 rotates while circumscribing the plate cylinder 7. A water roller 13 is provided. An intermediate roller 14 is provided in a circumscribed state so as to straddle one of the form rollers 12 in the ink supply device 10 and the water roller 13 of the water supply device 11. Water is also supplied from the water roller 13 to the landing roller 12 through the water roller 13.
The intermediate roller 14 can adjust the distance between the shafts of the water roller 13 and the dosing roller 12 by a driving tool (not shown) such as a fluid pressure cylinder. Pressure) and on / off switching of water supply.

As shown in FIGS. 5 and 6, the rotating shaft 7 a of the plate cylinder 7 protrudes at both end sides of the plate cylinder 7 and is rotatably held by a bearing case 21 via bearings 20. The bearing cases 21 on both sides are rotatably fitted to a case housing 23 provided on the device frame 22.
The bearing case 21 is formed in a double case structure in which the inner case 27 is rotatably and axially movable in the outer case 26, and the outer surface of the outer case 26 is the inner surface of the case housing 23. The inner peripheral surface of the inner case 27 and the outer peripheral surface of the bearing 20 are in sliding contact with the peripheral surface.

In the present embodiment, the case housing 23 is fixed to the device frame 22 via the fixing ring 28, but may be provided integrally with the device frame 22.
A rotation axis P1 where the rotation shaft 7a of the plate cylinder 7 is held with respect to the bearing case 21 (inner case 27), and a rotation axis P2 where the bearing case 21 (outer case 26) is held with respect to the case housing 23. Is an eccentric relationship with each other.
A shaft movement adjusting bolt 30 is connected to one bearing case 21 (FIG. 5 side) in a state of being relatively rotatable with respect to the inner case 27, and the shaft movement adjusting bolt 30 is connected to the apparatus frame 22. It is penetrated by the internal thread part 32 of the fixed adjustment cradle 31 by screwing. The axis of the shaft movement adjusting bolt 30 is concentric with the rotation axis P2 of the bearing case 21 (outer case 26).

A lock nut 33 is screwed onto the shaft movement adjusting bolt 30 and an adjustment dial 34 is fixed to the protruding end of the bolt. By rotating the adjustment dial 34 with the lock nut 33 loosened, The adjustment receiving base 31 is screwed forward / backward, so that the axial movement of the plate cylinder 7 with the inner case 27, that is, the lateral register adjustment of the plate cylinder 7 at the time of printing is enabled.
A rotating shaft 7a (on the side of FIG. 6) protruding on one side of the plate cylinder 7 is attached so as to be integrally rotatable. The rotating gear 6a of the rubber cylinder 6 and the rotating shaft 5a of the impression cylinder 5 are respectively attached. Rotational power is transmitted from a driving motor 38 (shown only in FIG. 3) via a driven gear (not shown) attached to the same side.

The bearing case 21 is provided with a flange portion 40 projecting radially outward from the outer case 26 at the end on the outer side of the device frame 22. A bracket 41 that protrudes radially outward at a predetermined angle is attached. As shown in FIG. 4, one end 42 a of a connecting rod 42 is connected to the bracket 41.
In the same manner that the flange portion 40 is provided in the pair of bearing cases 21 that hold the plate cylinder 7, the rubber cylinder 6 is provided with a pair of bearing cases 45 that rotatably hold the rotating shaft 6 a. The bearing case 45 is provided with a flange portion 46.

Further, the rotation axis P3 in which the rotation shaft 6a of the rubber cylinder 6 is rotated and held with respect to the bearing case 45 and the rotation axis P4 in which the bearing case 45 is rotated and held are in an eccentric relationship. .
A bracket 47 is attached to the flange portion 46 of the bearing case 45 so as to project radially outward from the outer peripheral portion at a predetermined angle. The other end portion 42b of the connecting rod 42 is connected to the bracket 47. ing. Further, the flange portion 46 is provided with a partial arc-shaped third gear 48 on an outer peripheral portion different from the bracket 47.

The impression cylinder 5 is also provided with a pair of bearing cases 50 for rotatably holding the rotary shaft 5a, and a flange portion 51 is provided on the bearing case 50. Further, the rotation axis P5 in which the rotation shaft 5a of the impression cylinder 5 is rotated and held with respect to the bearing case 50 and the rotation axis P6 in which the bearing case 50 is rotated and held are in an eccentric relationship. .
A flange portion 51 of the bearing case 50 is provided with a partial arc-shaped second gear 52 at a position where the flange portion 51 meshes with the third gear 48 on the rubber barrel 6 side, and an outer periphery different from the second gear 52. An arc-shaped first gear 53 is provided at the portion.

A driving gear 55 is engaged with the first gear 53 via an intermediate gear 54. The driving gear 55 can be rotated forward and backward by a predetermined angle by a rotary drive 56 such as an air actuator. ing.
That is, when the rotary drive 56 is rotated forward or backward at a predetermined angle, the drive is transmitted from the driving gear 55 to the first gear 53 via the intermediate gear 54, and the bearing case 50 of the impression cylinder 5 is rotated at a predetermined angle. Rotate. Then, driving is transmitted from the second gear 52 to the third gear 48, and the bearing case 45 of the rubber cylinder 6 rotates by a predetermined angle.

In the bearing case 50 of the impression cylinder 5 and the bearing case 45 of the rubber cylinder 6, the rotational directions are relatively opposite. Upon receiving the rotation of the bearing case 45 of the rubber cylinder 6, the connecting rod 42 is pushed and pulled, whereby the bearing case 21 of the plate cylinder 7 rotates by a predetermined angle. The bearing case 45 of the rubber cylinder 6 and the bearing case 21 of the plate cylinder 7 have the same rotational direction.
The rotation axis P5 of the impression cylinder 5 and the rotation axis P6 of the bearing case 50 are eccentric, the rotation axis P3 of the rubber cylinder 6 and the rotation axis P4 of the bearing case 45 are eccentric, and the plate cylinder 7 Since the rotation axis P1 and the rotation axis P2 of the bearing case 21 are eccentric, the bearing case 50, the bearing case 45, and the bearing case 21 are rotated by a predetermined angle as described above. At this time, the impression cylinder 5 is moved around the rotation axis P6, the rubber cylinder 6 is moved around the rotation axis P4, and the plate cylinder 7 is moved around the rotation axis P2. become.

FIG. 4 shows the state before the rotation of the rotary driving device 56, where the impression cylinder 5 and the rubber cylinder 6 can sandwich the substrate W, the plate cylinder 7 circumscribes the rubber cylinder 6, and at the same time, the ink supply device 10 It also circumscribes the form roller 12 (see FIG. 3) and is ready for printing. That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all arranged at the printing position.
On the other hand, FIG. 1 shows the state after the rotation of the rotary driving device 56, and the impression cylinder 5 and the rubber cylinder 6 are separated from each other, and the plate cylinder 7 is separated from the rubber cylinder 6 and the attaching roller 12 simultaneously. In other words, the idle rotation of each cylinder is possible (non-printing state). That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all arranged at the idle position.

As shown in FIG. 3, the water supply device 11 includes a water tray 60, a first water supply source roller 61 that is rotatably held in a state where the lower peripheral surface is sunk in the water tray 60, and the first water supply device 11. A second water supply source roller 62 that is rotatably held in a state of being separated from the supply source roller 61 by a predetermined distance and having a rotation axis parallel to each other, and the first and second water supply source rollers 61 and 62 are circumscribed simultaneously. The squeezing roller 63 is rotatably held in the state, and the water roller 13 described above is provided in a state of circumscribing the second water supply source roller 62 and the plate cylinder 7 at the same time.
The first and second water supply source rollers 61 and 62 are metal rollers, and the squeezing roller 63 and the water roller 13 are rubber rollers.

The water roller 13 and the second water supply source roller 62 are driven to rotate by obtaining power from the plate cylinder 7 side when the water roller 13 is circumscribed by the plate cylinder 7.
On the other hand, the squeezing roller 63 and the first water supply source roller 61 are driven to rotate by obtaining power from a drive motor (not shown) provided on the first water supply source roller 61. The rotational speed of the drive motor provided on the first water supply source roller 61 can be adjusted manually.
Further, the water supply device 11 moves the water roller 13 around the second water supply source roller 62 so that the circumscribed state is maintained even when the plate cylinder 7 moves to the printing position and the idling position. Follower 65 is provided.

As shown in FIG. 7, the follower 65 holds the water roller 13 by a support arm 66 that is swingably provided with the rotation axis of the second water supply source roller 62 as a fulcrum. The elastic member 67 is connected to the support arm 66 so as to move concentrically around the second water supply source roller 62 and to generate a spring force in the direction of pressing the water roller 13 against the plate cylinder 7. It has a structure.
In the present embodiment, a coil spring is used as the compression spring as the elastic member 67, but a ring spring may be attached around the rotation axis of the second water supply source roller 62. Also, with other structures, it is possible to generate a spring force that presses the water roller 13 against the plate cylinder 7, and in some cases, it is possible to adopt a structure that does not involve a spring force.

In this embodiment, a positive cam 68 that contacts the support arm 66 is provided, and the positive cam 68 is rotated by a fluid pressure drive type or electric rotary actuator 69 as necessary. 70 is provided.
For example, by operating the forced water stop device 70 at the time of cleaning or maintenance, the positive cam 68 swings the support arm 66 so as to push it away in the direction against the spring force of the spring 67, and the water roller 13 is forcibly separated from the plate cylinder 7.
The squeezing roller 63 forms a water amount adjusting device 73 for adjusting the amount of water supplied from the first water supply source roller 61 to the second water supply source roller 62 as shown in FIG.

  In addition to the squeezing roller 63, the water amount adjusting device 73 includes an operating shaft 77 provided with an adjusting handle 75 at one end and a worm gear 76 provided at the other end so that they can rotate integrally, and the operating shaft 77. A pinion gear 78 meshed with the worm gear 76, a first slip ring 79 provided eccentric to the rotation shaft 78 a with respect to the pinion gear 78, and a swingable connection around the first slip ring 79. The swinging arm 80 has a second slip ring 81 rotatably held at the tip of the swinging arm 80, and the rotation shaft 63 a of the squeezing roller 63 is eccentric to the second slip ring 81. It is held in a state to do.

Therefore, when the adjustment handle 75 is rotated, the pinion gear 78 is rotated via the worm gear 76, and the first slip ring 79 is caused to move circumferentially in accordance with the eccentric amount.
As a result, a swing driving component is given to the swing arm 80, but the outer periphery of the first slip ring 79 is accompanied by the circumscribing of the squeezing roller 63 to the first and second water supply source rollers 61 and 62. And the outer peripheral surface of the second slip ring 81 are each slipped from the swing arm 80. As a result, the squeezing roller 63 has a shaft with respect to the first and second water supply source rollers 61 and 62. The distance (external pressure) is adjusted, whereby the amount of water transmitted from the first water supply source roller 61 to the second water supply source roller 62 is adjusted.

Next, based on the movement of the offset printing machine 1, the operation control method according to the present invention will be described.
As shown in FIG. 4, while supplying the printing material W between the impression cylinder 5 and the rubber cylinder 6, the ink is applied from the form roller 12 of the ink supply device 10 to the plate cylinder 7 circumscribing the rubber cylinder 6. Then, water is supplied from each of the water rollers 13 of the water supply device 11 to print the substrate W.
At the time of non-printing such as during maintenance or a break, first, the ink supply by the ink supply device 10 is stopped, and then, as shown in FIG. 1, the rotation driving device 56 is rotated counterclockwise by a predetermined angle. Then, driving force is transmitted from the driving gear 55 to the first gear 53 via the intermediate gear 54, and the bearing case 50 of the impression cylinder 5 rotates counterclockwise by a predetermined angle.

Further, the driving force is transmitted from the second gear 52 to the third gear 48, the bearing case 45 of the rubber cylinder 6 rotates clockwise by a predetermined angle, and the connecting rod 42 moves downward by receiving the rotation of the bearing case 45. The bearing case 21 of the plate cylinder 7 is also rotated clockwise by a predetermined angle.
Accordingly, as the bearing cases 50, 45, and 21 are rotated, the impression cylinder 5 moves around the rotation axis P6 (about 2 mm on the outer peripheral surface), and the rubber cylinder 6 moves around the rotation axis P4. A position movement (about 1.5 mm on the outer peripheral surface) is caused, and the plate cylinder 7 causes a position movement (about 1 mm on the outer peripheral surface) around the rotation axis P2.

That is, the impression cylinder 5, the rubber cylinder 6, and the plate cylinder 7 are all in a state of being separated from each other and not circumscribed. However, the driven gears (see the driven gear 37 of the plate cylinder 7 shown in FIG. 6) provided on the rotary shafts 5a, 6a and 7a of the pressure cylinder 5, the rubber cylinder 6 and the plate cylinder 7 are mutually connected with the pitch circle. However, since the meshing state between the gear teeth is not released, the interlocking rotation state is maintained.
At this time, in the water supply apparatus 11, as shown in FIG. 7, the follower 65 moves the water roller 13 around the second water supply source roller 62 to maintain the circumscribed state to the plate cylinder 7. . Therefore, the plate cylinder 7 can always maintain an appropriate wet state even during the non-printing.

In this manner, the plate cylinder 7 is simultaneously separated from the rubber cylinder 6 and the form roller 12 of the ink supply device 10, but is in an idle position that maintains a circumscribed state with the water roller 13 of the water supply device 11.
Here, the driving motor 38 is controlled, and the plate cylinder 7 is idle-rotated at a lower speed than the rotation speed at the time of printing. In this case, since the rotation of the water roller 13 circumscribing the plate cylinder 7 is also reduced, the amount of water supplied from the water roller 13 to the plate cylinder 7 is suppressed to the minimum necessary.
If necessary, the adjustment handle 75 of the water amount adjusting device 73 (see FIG. 8) is operated to adjust the interaxial distance (external pressure) between the squeeze roller 63 and the first and second water supply source rollers 61 and 62. Or by decelerating and controlling a drive motor (not shown) that drives the first water supply roller 61 to rotate, from the first water supply roller 61 to the second water supply roller 62. The amount of water transmitted may be adjusted.

When changing from the non-printing state to the printing state, the impression cylinder 5, the rubber cylinder 6 and the plate cylinder 7 are returned to the mutually circumscribed state, and at the same time, the plate cylinder 7 is brought into the circumscribed state with the form roller 12 of the ink supply device 10. Then, the ink supply by the ink supply device 10 is restarted, and the condition is adjusted by temporarily running the impression cylinder 5, the rubber cylinder 6 and the plate cylinder 7 at a speed higher than the idle rotation.
Thereafter, the printing material W may be supplied between the impression cylinder 5 and the rubber cylinder 6 to start printing. Since the plate cylinder 7 is kept in an appropriate wet state during non-printing (during idling), the ink adhering to the plate cylinder 7 is not dried, and printing can be resumed easily and quickly.

  By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment. For example, a pair of water rollers 13 are provided across a horizontal line passing through the rotation axis P1 of the plate cylinder 7, and a follower 65 for pulling the pair of water rollers 13 in the opposite inward direction is provided. The plate cylinder 7 may be caused to follow the movement of the plate cylinder 7 by moving in the perspective direction with respect to the horizontal line passing through the rotation axis P <b> 1 while simultaneously circumscribing the roller 62 and the plate cylinder 7.

It is the side view which showed the positional relationship of the plate cylinder, the rubber cylinder, and the impression cylinder at the time of non-printing (during idling). It is the perspective view which showed the example of the installation about one Embodiment of the offset printing machine which concerns on this invention. It is the perspective view which showed the internal structure in the offset printing machine of FIG. It is the side view which showed the positional relationship of the plate cylinder, the rubber cylinder, and the impression cylinder at the time of printing. FIG. 5 is a cross-sectional plan view showing the axial direction near one end corresponding to the line AA in FIG. 4. FIG. 5 is a plan sectional view showing the vicinity of the other end in the axial direction corresponding to the line AA in FIG. 4. It is a side view corresponding to the B section of FIG. It is a side view corresponding to the C section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Offset printing machine 5 Pressure cylinder 6 Rubber cylinder 7 Plate cylinder 7a Rotating shaft 10 Ink supply apparatus 11 Water supply apparatus 12 Forming roller 13 Water roller 21 Bearing case 22 Apparatus frame 23 Case housing 62 Water supply source roller 65 Follow-up means W Substrate

Claims (4)

An impression cylinder (5) and a rubber cylinder (6) are provided so as to sandwich a supply line of the substrate (W), and a plate cylinder (7) is circumscribed by the rubber cylinder (6), and an ink supply device (10). In the offset printing machine in which the form roller (12) and the water roller (13) of the water supply device (11) are provided so as to circumscribe the plate cylinder (7),
The plate cylinder (7) is in contact with the rubber cylinder (6) and the form roller (12) at the same time to be in a printing state, and is separated from the rubber cylinder (6) and the form roller (12) at the same time. It is possible to move to the idling position that rotates idle in the printing state,
The water roller (13) of the water supply device (11) is positioned at the printing position and the idling position by concentrically moving around a water supply roller (62) that supplies water to the water roller (13). movement of the plate cylinder plate cylinder so as to circumscribe a (7) (7) follows capable provided to,
An offset printing machine characterized in that the water supply device (11) is provided with a follower (65) for generating a spring force in a direction in which the water roller (13) is pressed against the plate cylinder (7) . A bearing case (21) that rotatably holds the rotating shaft (7a) of the plate cylinder (7) is rotatably fitted and held in a case housing (23) provided in the apparatus frame (22). ,
In order to enable the position movement of the plate cylinder (7), the rotation shaft (7a) of the plate cylinder (7) and the rotation axis (P2) of the bearing case (21) with respect to the case housing (23) are eccentric to each other. an offset printing machine according to claim 1 Symbol mounting, characterized in that are. While supplying the printing material (W) between the impression cylinder (5) and the rubber cylinder (6), the ink supply device (10) is attached to the plate cylinder (7) circumscribing the rubber cylinder (6). In the method of controlling the operation of the offset printing machine for printing the substrate (W) by supplying ink from the roller (12) and water from the water roller (13) of the water supply device (11), respectively.
At the time of non-printing, the plate cylinder (7) is simultaneously separated from the rubber cylinder (6) and the form roller (12) , and the water roller (13) is provided around the water supply roller (62) for supplying water to the water roller (13). ) Are moved concentrically around the water supply source roller (62) and the water roller (13)
Maintain the circumscribed state with the plate cylinder (7),
Water that circumscribes the plate cylinder (7) as the plate cylinder (7), which is simultaneously separated from the rubber cylinder (6) and the form roller (12), is idle-rotated at a speed lower than the rotation speed during printing. The roller (13) is also rotated at a low speed, and the water roller (13) maintains the state where the water of the water supply source roller (62) is supplied to the plate cylinder (7) during idle rotation. An operation control method for an offset printing press. The plate cylinder (7) is idle-rotated at a lower speed than the rotation speed during printing when not printing,
When changing from the non-printing state to the printing state, claim, characterized in that to idle operation plate cylinder (7) at a higher speed than idle speed while circumscribing simultaneously blanket cylinder (6) and form roller (12) 3 The operation control method of the offset printing machine as described.

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