JPH11198338A - Method and apparatus for driving form-dampening roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a hicky while continuing an operation without shortening a plate life of a printing plate. SOLUTION: The apparatus for driving a form-dampening roller comprises a water fountain roller 3 rotating in a water tank 3 for storing a dampening water to feed the water, a smoothing roller 4 for uniformly smoothing the water received by contact rotating with the roller 3, and the form-dampening roller 5 rotating in contact with the roller 4 to give the received water to a plate surface. A same speed driving route for rotatably driving the roller 5 at the same speed as a surface speed of a plate cylinder 1 and a decelerating speed driving route for rotatably driving the roller 5 at a slower speed than the surface speed of the cylinder 1 are provided at a driving route of the roller 5. These two driving routes are selectively switched to generate a wiping action between the cylinder 1 and the roller 5, thereby removing a hicky.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a dampening roller applied to a damping device of an offset printing press, and a driving device for the dampening roller using the method.

[0002]

2. Description of the Related Art In an offset printing press, dampening water is supplied to a plate surface of a plate cylinder by a dampening device. The dampening water supply system of this dampening device uses a separate system from ink supply. There are a conventional method for directly supplying dampening water to the plate surface, and a simultaneous supply method for simultaneously supplying ink and dampening water. In both the conventional system and the simultaneous supply system, such a dampening device includes a water tank that stores dampening water, a water roller that rotates in the water tank and sends out dampening water, and a water tank that receives water from the water roller. It comprises a leveling roller for leveling the dampening solution uniformly, a dampening roller for applying the dampening solution received from the leveling roller to the printing plate, and a drive / control device for these rollers.

FIGS. 6 and 7 show a conventional driving device of the dampening roller 5 in such a dampening device.
As shown in FIGS. 6 and 7, the water setting roller 5
The rotation power is transmitted from the gear 11 to the gear 24 of the watering roller 5 via the intermediate gear, and the rotation is driven at the same surface speed as the plate cylinder 1. Although not shown, the former roller and the drive device of the leveling roller are independently driven by a single variable speed motor, so that the rotation speed can be changed steplessly according to printing conditions. The latter is driven to rotate while reciprocating in the axial direction via an oscillation mechanism. In addition,
In the figure, 16 to 18 are gears, 22 is a drive shaft, and 23 is a gear.

In the conventional offset printing, when a foreign matter such as a dried film of ink, paper dust, or other dust adheres to the plate surface, a stain called a "hickey", which causes partial white spots and stains in a non-image area, occurs. The phenomenon occurs. When this hickey occurs, printing is performed after removing foreign substances adhering to the plate surface by manual operation during operation or temporarily stopping the machine and leveling the surface. When hickeys were constantly generated, the ink was replaced and the operation was performed. For such a hickey, it belongs to a simultaneous feeding type dampening device, and the wiper generated between the plate cylinder and the damper roller is always driven by rotating the damper roller at a lower surface speed than the plate cylinder. There is one that removes Hickey by action.

[0005]

However, the above-described conventional dampening devices include a conventional system and a conventional system.
The simultaneous supply method also has the following disadvantages. (1) Since a conventional watering roller such as a conventional system is driven to rotate at the same surface speed as the plate cylinder, it is not possible to remove foreign substances adhering to the plate surface by the wiping action of the watering roller. For this reason, when a hickey occurs, it is necessary to manually remove foreign substances adhering to the plate surface during operation, or to temporarily stop the operation to level the surface, thereby increasing the load on the operator. Thus, the work efficiency was significantly impaired. (2) On the other hand, in the system in which the dampening roller employed in the simultaneous supply type dampening device is always driven to rotate at a surface speed lower than that of the plate cylinder, foreign matters adhering to the plate surface can be removed by the plate cylinder and the dampening roller. It is removed by the wiping action that occurs in between, and the generation of hickey is suppressed. On the other hand, the plate surface is constantly rubbed by a wet roller, so that the life of the plate is shortened.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to solve the conventional problems and to reduce the printing durability of a plate and to make it easy to continue operation. It is an object of the present invention to provide a method for driving a wetting roller applied to a dampening device for a printing press, which is capable of removing a hickey, and a driving device therefor.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a water tank for storing dampening water, and a water roller which rotates in the water tank to feed the dampening water. And a leveling roller for uniformly leveling the dampening solution received by contacting with the fountain roller and a dampening roller for contacting and rotating the fountain solution and receiving the dampening solution to the plate surface. In the driving method of the dampening roller applied to the dampening device of the printing press, the drive path of the dampening roller, the same speed drive path to rotate the dampening roller at the same speed as the surface speed of the plate cylinder, A deceleration drive path for rotating the dipping roller at a speed lower than the surface velocity of the plate cylinder when a hitkey occurs is provided. By selectively switching between these two drive paths, the plate cylinder and the dipping roller are switched. Followed by removal of hickeys by causing effect wiping between. In addition, the switching of the drive path is automatically performed based on output information of a quality inspection device attached to the printing press, or the speed of the water roller in the drive path switching process is automatically adjusted when the drive path is switched. It is also possible to make a correction.

Further, in the present invention, a water tank for storing dampening water, a water supply roller rotating in the water tank to feed out the water, and a dampening water received by rotating the water supply roller in contact with the water supply roller. Roller drive unit applied to a damping device of a printing press, which has a smoothing roller for uniformly smoothing the printing plate, and a dampening roller for rotating the contacting roller with the smoothing roller to apply the received dampening solution to the plate surface. In the drive path of the watering roller, the same speed driving path for rotating the watering roller at the same speed as the surface speed of the plate cylinder, and the watering roller at a speed lower than the surface speed of the plate cylinder at the time of occurrence of hitkey. A deceleration drive path for rotating at a low speed and drive path switching means for selectively switching between these two drive paths are provided. In addition, the drive path switching means may be provided with an automatic switching control means for automatically switching the drive path based on output information of a quality inspection device attached to the printing press, or the drive path switching means may be provided with a drive path. It is also possible to add a speed correcting means for automatically correcting the speed of the water supply roller in the process of switching.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is a layout view showing the entirety of a dampening device for a printing press according to a first embodiment of the present invention, FIG. 2 is a front view showing a driving device of a wetting roller of the first embodiment, and FIG. FIG. 2 is a side view showing the driving device.

1 to 3, reference numeral 1 denotes a plate cylinder of an offset sheet-fed printing press; 2, a water tank for storing dampening solution; 3, which is rotationally driven by a single variable speed motor; A water roller 4 which is immersed and rotates in the water tank 2 to send out dampening water, contacts the water roller 3 while reciprocating in the axial direction via an oscillation mechanism, and rotates. A leveling roller 5 for uniformly leveling the dampening solution received from 3 is rotated by a gear from the plate cylinder 1 and rotates in contact with the leveling roller 4 to remove the dampening solution received from the leveling roller 4. It is a roller that gives water to the plate.

The driving device for the watering roller 5 of the present embodiment is applied to the damping device of the offset sheet-fed printing press configured as described above, and is provided on the driving path of the watering roller 5. The same speed drive path for driving the dipping roller 5 to rotate at the same speed as the surface speed of the plate cylinder 1; and a deceleration for driving the dipping roller 5 to rotate at a speed lower than the surface speed of the plate cylinder 1 when removing the hickey. A drive path and drive path switching means for selectively switching between these two drive paths are provided.

As shown in FIGS. 2 and 3, the same speed drive path is fixed to the shaft inner end of the drive shaft 22 from the gear 17 meshing with the gear 11 of the plate cylinder 1 through the intermediate gear 18 to the gear 16. Gear 2 of watering roller 5 from gear 23 provided
4, the number of teeth of each gear in the same-speed drive path is determined by setting the wet roller 5 to the plate cylinder 1
It is formed so as to rotate at the same speed as the surface speed. The drive shaft 22 is rotatably provided in a frame (not shown).

As shown in FIGS. 2 and 3, the deceleration drive path extends from the gear 12 meshing with the gear 11 of the plate cylinder 1, through the intermediate gear 13, the gear 14, the gear 15, the gear 16, and the drive shaft 22. 2 fixed to the inner shaft end of the frame
3 is a drive path for transmitting rotational power to the gear 24 of the water setting roller 5. The number of teeth of each gear in this reduction drive path rotates the water setting roller 5 at a speed lower than the surface speed of the plate cylinder 1. It is formed as follows.

Further, as shown in FIGS. 2 and 3, the drive path switching means is an electromagnetic clutch attached to an output shaft end of an intermediate shaft 21A rotatably supporting the intermediate gear 18 of the same speed drive path. 20A, an electromagnetic clutch 20B attached to the output shaft end of an intermediate shaft 21B rotatably supporting the gear 14 of the deceleration drive path, and an operation panel for selectively switching between the two electromagnetic clutches 20A and 20B (FIG. (Not shown). The type of the clutch is not limited to the electromagnetic type, but may be an air type or a manual type.

The driving device for the wetting roller 5 of the present embodiment having the above-described configuration first sets the operation mode selection key (not shown) of the operation panel to the "same speed mode" to start the operation of the printing press. The printing operation start signal excites the electromagnetic clutch 20A of the same speed drive path,
Rotates from the gear 11 of the plate cylinder 1 via the gear 17 → intermediate gear 18 → gear 16 → gear 23 → gear 24 at the same speed as the surface speed of the plate cylinder 1, and from the water source roller 3 via the leveling roller 4 The fountain solution in the water tank 2 is supplied to the plate surface. After the start of the printing operation, if the occurrence of a hitkey on the stamp surface is found visually or by a quality inspection device, the operation mode selection key on the operation panel is switched to the "deceleration mode".
Then, the electromagnetic clutch 20A on the same speed drive path is demagnetized, and the electromagnetic clutch 20B on the deceleration drive path is excited.
Therefore, the water setting roller 5 is moved from the gear 11 of the plate cylinder 1 to the gear 12 → gear 13 → gear 14 → gear 15 → gear 16 →
It rotates at a speed lower than the surface speed of the plate cylinder 1 via the gear 23 → gear 24, and a wiping action occurs between the plate cylinder 1 and the water setting roller 5 to remove foreign matter adhering to the plate surface. become.

When the hickey is removed in this way,
Press the operation mode selection key on the operation panel again to “Same speed mode”.
Switch to Then, the electromagnetic clutch 2 of the same speed drive path
0A is excited and the electromagnetic clutch 20B on the deceleration drive path is demagnetized, so that the watering roller 5 returns to the same speed as the surface speed of the plate cylinder 1 again via each gear on the same speed drive path described above. And rotate.

As described above, the driving device for the wetting roller according to the first embodiment of the present invention includes the
And a driving path for rotating the dipping roller 5 at the same speed as the surface speed of the plate cylinder 1;
Is provided at a speed lower than the surface speed of the plate cylinder 1, and the two drive paths can be selectively switched by the drive path switching means. (1) Immediately after the occurrence of the hickey, by switching to the deceleration drive path, the dampening roller 5 rotates at a lower surface speed than the plate cylinder 1, and the foreign matter adhering to the plate surface is removed by the plate cylinder 1 and the dampening roller 5. Hickeys are immediately removed by the wiping action that occurs in between, eliminating the need to manually remove foreign substances during operation as in the past or to temporarily stop operation to level the surface, greatly improving work efficiency. Can be improved. (2) Since the wet roller 5 is always driven to rotate at the same surface speed as the plate cylinder 1 except when the hickey is removed, the water roller 5 is always driven to rotate at a lower surface speed than the plate cylinder 1. Unlike the method, the plate surface is not rubbed by the wet roller 5, so that the printing durability of the plate is not shortened, and the economic effect is large.

FIG. 4 is a flow chart showing the procedure for automatically switching the drive path of the watering roller according to the second embodiment of the present invention. In the first embodiment, the drive path switching of the driving device of the water landing roller 5 is performed by remote control using the operation panel. In the second embodiment, the drive path switching unit automatically switches the drive path. Automatic switching control means for performing this operation is added. The automatic switching control means includes, as shown in FIG. 4, a quality inspection device 30 attached to a discharge section of a printing press (not shown),
A clutch control circuit (not shown) for turning on and off the electromagnetic clutches 20A and 20B in response to an output signal indicating the presence or absence of a hitkey detected by 0. Other configurations are the same as those of the first embodiment.

In the driving device of the watering roller 5 of the present embodiment, the electromagnetic clutch 20A of the same speed drive path is automatically excited by the signal of the operation start of the printing press, and the watering roller 5 is driven by the gear of the plate cylinder 1. 11 is rotated through the gear 17 → gear 18 → gear 16 → gear 23 → gear 24 at the same speed as the surface speed of the plate cylinder 1, and the water tank 2 sent out from the water supply roller 3 via the leveling roller 4 is rotated. Is supplied to the plate. When the quality inspection device 30 detects the occurrence of a hitkey during the printing operation, as shown in FIG. 4, a clutch control circuit (not shown) of the automatic switching control means demagnetizes the electromagnetic clutch 20A on the same speed drive path and decelerates. Electromagnetic clutch 20B for drive path
And automatically switches the drive path to the deceleration drive path. Therefore, the wetting roller 5 is provided with the gear 11 of the plate cylinder 1.
Gear 12 → gear 13 → gear 14 → gear 15 → gear 1
6 → the gear 23 rotates through the gear 24 at a speed lower than the surface speed of the plate cylinder 1, and removes foreign matter adhering to the plate surface by a wiping action generated between the plate cylinder 1 and the wet roller 5. become.

When the quality inspection device 30 confirms that the hitkey has been removed, the clutch control circuit excites the electromagnetic clutch 20A on the same speed drive path and demagnetizes the electromagnetic clutch 20B on the deceleration drive path based on the signal. , The drive path is automatically switched to the same-speed drive path,
It returns to the same speed as the surface speed of the plate cylinder 1 and enters a normal printing operation state. Therefore, in the present embodiment, the detection of the hickey and the removal of the hickey are all automatically performed.
The labor saving effect is great without requiring any additional manpower. Other functions and effects are the same as those of the first embodiment.

FIG. 5 is a flowchart showing the procedure for correcting the speed of the water roller according to the third embodiment of the present invention. In the second embodiment, only the driving path of the driving device of the watering roller 5 is automatically switched by the output signal indicating the presence or absence of the hitkey detected by the quality inspection device 30.
In the embodiment, in addition to the automatic switching of the drive path,
A speed correcting means for automatically correcting the speed of the water supply roller 3 is added. As shown in FIG. 5, the speed correcting means is driven by the electromagnetic clutches 20A and 20A of the drive path switching means by the quality inspection device 30 attached to the printing press.
A clutch control circuit (not shown) that turns B on and off
And a speed correction circuit (not shown) for correcting the speed of the water roller 3 operating on the deceleration drive path. Other configurations are the same as those of the second embodiment. In the third embodiment, the speed correction of the water roller 3 is automatically performed based on a signal from the quality inspection device 30. However, the quality inspection device 30 is not provided, and the correction is performed by remote control using an operation panel. It may be performed.

In the driving device of the dipping roller according to the present embodiment, the electromagnetic clutch 20A on the same speed drive path is excited by a signal for starting the operation of the printing press, and the dipping roller 5 is driven at the same speed as the surface speed of the plate cylinder 1. It rotates and supplies dampening water in the water tank 2 sent out from the water source roller 3 via the leveling roller 4 to the plate surface. The fountain roller 3 at the time of printing is rotating at a predetermined number of revolutions following the speed of the plate cylinder 1. Quality inspection device 30
When the printer detects the occurrence of a hitkey during printing, the drive path of the drive device of the watering roller 5 is automatically switched to the deceleration drive path by the automatic switching control means described above.
At the same time, the fountain roller 3 is decelerated by the preset rotation amount correction value, and the consumption reduction of the supply water amount due to the deceleration of the water setting roller 5 is corrected so that excessive dampening water is not supplied to the plate surface. ing.

The water source roller 3 is rotated at the corrected number of revolutions, the foreign matter adhering to the plate surface is removed by the wiping action generated between the plate cylinder 1 and the water setting roller 5, and the quality of removing the hitkey is high. When the inspection device 30 detects the signal, the signal is automatically switched to the same-speed drive path as described above. At the same time, the speed of the water supply roller 3 returns to the normal printing operation state. Note that the correction amount may vary depending on the material used or the like, and can be set by a correction circuit. Therefore, in the present embodiment, the correction of the speed of the water roller 3 in the process of removing the hickey is all automatically performed. Therefore, the removal of the hickey does not require any manual operation, and a printed matter having a stable density is always obtained. Thus, waste paper can be reduced. Other functions and effects are the same as those of the second embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the spirit of the present invention. What you get.

[0025]

As described above, the driving method of the watering roller according to the present invention is the same speed drive that drives the watering roller to rotate at the same speed as the surface speed of the plate cylinder in the driving path of the watering roller. Path, and a deceleration drive path for rotating the dipping roller at a speed lower than the surface speed of the plate cylinder when a hickey occurs, and by selectively switching between these two drive paths, the plate cylinder and the A wiping action is generated between the roller and the watering roller to remove the hickey. Further, the driving device for the watering roller according to the present invention includes a driving path for the watering roller, a driving path for rotating the watering roller at the same speed as the surface speed of the plate cylinder, A deceleration drive path for rotating the dipping roller at a speed lower than the surface speed of the plate cylinder, and drive path switching means for selectively switching between the two drive paths are provided. Therefore, according to the driving method and the driving device of the wetting roller of the present invention, it is possible to easily remove the hickey during the operation without shortening the printing durability of the plate and greatly reduce the work efficiency. It is possible to improve the cost and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the entire structure of a damping device for a printing press according to a first embodiment of the present invention.

FIG. 2 is a front view showing a driving device of the wetting roller according to the first embodiment of the present invention.

FIG. 3 is a side view showing a driving device of the wetting roller according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating a procedure for automatically switching a drive path of a wetting roller according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating a point of speed correction of a water roller according to a third embodiment of the present invention.

FIG. 6 is a front view showing a driving device for a conventional watering roller.

FIG. 7 is a side view showing a conventional driving device for a wetting roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Water tank 3 Water roller 4 Leveling roller 5 Watering roller 11-18 Gear 20A, 20B Electromagnetic clutch 21A, 21B Intermediate shaft 22 Drive shaft 23, 24 Gear 30 Quality inspection device

Claims (6)

[Claims] 1. A water tank for storing dampening water, a water supply roller rotating in the water tank to feed out the dampening water, and a water roller contacted with the water supply roller and rotated to uniformly receive the dampening water. A damp roller applied to a damping device of a printing press having a dampening roller and a dampening roller for applying dampening water received by rotating the contacting roller to the leveling roller. A driving path for the roller, a same-speed driving path for rotating the dipping roller at the same speed as the surface speed of the plate cylinder, and a drivable roller for rotating the dipping roller at a speed lower than the surface speed of the plate cylinder when a hickey occurs. A deceleration drive path to be provided is provided, and by selectively switching between these two drive paths, a wiping action is generated between the plate cylinder and the water setting roller to remove the hitkey. Water How to drive the wear roller. 2. The wetting roller according to claim 1, wherein the switching of the driving path is automatically performed based on output information of a quality inspection device attached to the printing press. Drive method. 3. The wetting roller according to claim 1, wherein the speed of the water roller in the process of switching the drive path is automatically corrected when the drive path is switched. Drive method. 4. A water tank for storing dampening water, a water roller which rotates in the water tank to feed out dampening water, and if the dampening water received by rotating in contact with the water roller is evened out. A damper roller and a damper roller applied to a dampening device of a printing press having a dampening roller for applying dampening water received by rotating the contact roller to the plate surface. A driving path for the roller, a same-speed driving path for rotating the dipping roller at the same speed as the surface speed of the plate cylinder, and a drivable roller for rotating the dipping roller at a speed lower than the surface speed of the plate cylinder when a hickey occurs. And a drive path switching means for selectively switching between the two drive paths. 5. An apparatus according to claim 4, wherein said drive path switching means further includes an automatic switching control means for automatically switching a drive path based on output information of a quality inspection device attached to a printing press. A driving device for the watering roller as described in the above. 6. The drive path switching means according to claim 4, further comprising a speed correction means for automatically correcting the speed of the water roller during the drive path switching process. Driving roller drive.