JP2762361B2 - Printing press water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printing press, in which a dampening solution in a watercraft is transferred between a plurality of rollers and then supplied to a plate surface on a plate cylinder by a swimsuit roller. The present invention relates to a water supply device, and more particularly to a water supply device used also as a dust removal device for a plate cylinder.

[Conventional technology]

In a lithographic printing press, an image is formed on a surface of a plate mounted on a peripheral surface of a plate cylinder with ink supplied by an inking device and a water supply device and dampening water (hereinafter, referred to as water). Is transferred to a paper passing between the cylinders directly or via a blanket cylinder and printed.

In such a printing operation, a dried film of the ink mixes with the ink and sticks to the plate surface, or paper powder generated during cutting of the supplied paper is scattered and adheres to the plate surface. , A printing failure occurs in which the printed portion is missing in some places as white spots.

Therefore, conventionally, in order to prevent the occurrence of this printing failure,
Various refuse removing apparatuses for removing refuse such as ink residue and paper dust have been proposed and used. As this type of conventional dust removing device, a dust removing rod provided so as to be able to move forward and backward is inserted from between the inking device and the water supply device, and a doctor blade at the tip thereof is pressed against a plate surface on a rotating plate cylinder to remove dust. There is used a material to be removed or a material in which a cloth wound with a drum is provided in place of the doctor blade, and the cloth is pressed against the plate surface to be wound every time dust is removed.

However, in such a conventional refuse removing apparatus, every time a print failure occurs in a printed matter, it is necessary to search for a place where the refuse is attached and move the refuse removing rod in a narrow work space, so that operation is troublesome and work efficiency is reduced. Bad
Not only is there a problem in terms of safety, but there is also a problem that the cost of equipment increases and the occupied space increases because a dedicated device is required.

Therefore, conventionally, it has been proposed to use a swimsuit roller of the water supply device that supplies water to the plate surface in contact with the plate cylinder, and that the peripheral speed of the water supply device is different from the peripheral speed of the plate cylinder to remove dust by sliding. .

[Problems to be solved by the invention]

However, in the conventional water supply device that is also used as such a dust removal device, the plate cylinder and the swimsuit roller are always kept at different speeds, so that the printing plate and the swimsuit roller keep slipping during the printing operation. Therefore, there is a problem that wear of the plate is accelerated. In addition, there has been proposed a type in which the swimsuit roller is driven by a motor different from the plate cylinder to change the speed only at the time of dust removal, but in this case, a large output motor is required due to a large torque for driving the swimsuit roller. However, there is a problem that operability is poor because the machine motor for the plate cylinder and the motor for the swimsuit roller must be rotated periodically. Further, in all of these apparatuses, the peripheral speed ratio between the plate cylinder and the swimsuit roller is constant, but there is a problem that if the speed of the machine changes, the peripheral speed difference between the plate cylinder and the swimsuit roller changes. .

[Means for solving the problem]

In order to solve such a problem, in the present invention, a driving gear connected to a plate cylinder and a gear and a driven gear connected to a swimsuit roller and a gear are spaced apart on a gear shaft that is driven to rotate by a motor. A differential gear that is freely rotatably mounted on the gear shaft between the drive gear and the driven gear, the speed of the drive gear is changed and transmitted to the driven gear, and the speed ratio changes according to the rotation speed of the gear shaft. The number of gear teeth between the plate cylinder and the swimsuit roller, including the differential, is set so that the peripheral speed of the plate cylinder and the swimsuit roller are almost the same when the gear shaft is stopped. It was set.

[Action]

During the printing operation, the water in the watercraft is transferred between the plurality of rollers and then supplied to the printing plate by the swimsuit rollers. In this case, since the motor is stopped and the gear shaft is stopped,
Due to the speed change by the gears and the differential device, the peripheral speed of the swimsuit roller and the peripheral speed of the plate cylinder that are in contact with the plate surface are the same speed, the peripheral surfaces do not slip, and the peripheral surface of the swimsuit roller and the plate surface do not wear.

If dirt adheres to the plate surface, rotate the motor,
The peripheral speed of the swimsuit roller is changed by the action of the differential device to a speed different from the peripheral speed of the plate cylinder, so that the peripheral surfaces slide and dust is removed. The peripheral speed difference between the plate cylinder and the swimsuit roller does not change regardless of whether the rotation speed of the machine is high or low.

〔Example〕

1 to 3 show an embodiment of a water supply device for a printing press according to the present invention. FIG. 1 is an exploded vertical sectional view, FIG. 2 is a cylinder arrangement diagram, and FIG. It is an expanded longitudinal sectional view. In the figure, a plate cylinder 3 having a plate 2 mounted on its peripheral surface is rotatably driven from the driving side to be supported on the left and right frames 1, and a plate cylinder gear 4 is mounted on its shaft end. And a dampening solution 5 (hereinafter referred to as water 5) is provided beside the plate cylinder 3.
Is stored between the left and right frames 1. Roller arms 7 are rotatably supported by the left and right frames 1. At the free ends of these left and right roller arms 7, a water source roller 8 driven to rotate from the driving side is provided.
The lower part is immersed in the water 5 in the watercraft 6, and is rotatably supported. Further, another roller arm 11 connected to the roller arm 7 by a lever 10 is pivotally supported on a stud 9 implanted in the left and right frames 1 by bolting. The free end bearing has a metering roller
Numeral 12 is rotatably supported with its peripheral surface in contact with the peripheral surface of the water source roller 8.

From the frame 1 on one side, the base 13 has a plurality of stays.
It is supported and protruded at 14,15,16, and on its outer surface,
The motor base 17 is fixed with a bolt 19 via a bearing retainer 18. Reference numeral 20 denotes a motor bolted to the motor base 17, and a gear shaft 22 extending in the direction of the frame 1 is connected to the motor shaft 21 by a coupling 23. The gear shaft 22 is fitted into the hole of the base 13 and
Ball bearing 24 held by the above, and the ball bearing fitted in the inner hole of the bearing case 25 of one frame
26 and both ends are rotatably supported by the gear shaft 22.
On the upper side, a driving gear 27 and a driven gear 28 are provided with ball bearings adjacent to the bearing case 25 and the base 13, respectively.
It is fitted rotatably via 29,30. Reference numeral 31 denotes a joint which is divided in the axial direction and joined by bolts,
7 and 28, it is rotatably fitted on the gear shaft 22 via a ball bearing 32 and a member of a differential device described later, and between the joint 31 and the drive gear 27. , A differential device indicated by reference numeral 33 is interposed. This differential
Reference numeral 33 denotes a plug 34 having a peripheral surface formed in an elliptical shape and fixed to the gear shaft 22 by a key, and a pair of outer rings formed in an elliptical shape by an elastic material and fitted and fixed to the elliptical peripheral surface of the plug 34. A ball bearing 35, an external gear 36 formed in an annular shape of thin special steel having elasticity, having external teeth, and fitted to the ball bearing 35 in an elastically deformed state into an elliptical shape;
An annular drive-side internal gear 37A having internal teeth engaged with the external teeth of the external gear 36 and fixed to the drive gear 27 with bolts, and internal teeth engaged with the external teeth of the external gear 36, and the joint 31 is bolted. A differential device formed by a fixed annular driven internal gear 37B, wherein the external gear 36 and the driven internal gear 37B are a driving internal gear 37A.
And the number of teeth is two less than that of the same pitch. With this configuration, when the drive gear 27 rotates and the drive-side internal gear 37A rotates while the gear shaft 22 is rotating or stopped, the drive gear 27 meshes with this at the elliptical long axis portion. The external gear 36 rotates, and the driven internal gear 37B that meshes with the long axis portion of the external gear 36 rotates, and the joint integrally formed with the driven internal gear 37B rotates. In the present embodiment, the drive gear 27 is set to 1 while the gear shaft 22 is stopped by the setting of the number of external teeth and internal teeth.
When rotated, the joint 31 is configured to rotate 81/80. In this state, the gear ratio is changed from 81/80 to 81/80 + X / 80 from 81/80 by rotating the gear shaft 22 by the motor 20 in accordance with the rotation speed X from this state.

Further, a differential 38 having the same configuration as the differential 33 is provided on the gear shaft 22 between the joint 31 and the driven gear 28. In this embodiment, the number of teeth of the external teeth and the internal teeth is set. When the joint 31 makes one rotation while the gear shaft 22 is stopped, the driven gear 28
It is configured to make zero rotation. Then, by rotating the gear shaft 22 by the motor 20, the gear ratio of the differential device 38 changes from 51/50 to 51/50 + X / 50 according to the rotation speed X. 39 and 50 are thrust bearings, and 41
Is a transmission gear which is fitted on the stay 14 and transmits the rotation of the plate cylinder gear 4 to other devices.

On the other hand, an intermediate gear 44 meshing with the driven gear 28 is rotatably fitted to a stud 43 inserted into the shaft hole of the base 13 and fixed with a nut 42 via a bearing 45. Bearing presser 47 bolted to the plane of
, A coupling 48 is fixed concentrically with the intermediate gear 44. Reference numeral 49 denotes a conduction shaft inserted into the hole of the coupling 48 and fixed by a key. The conduction shaft 49 is rotatably supported via a bearing 51 by a bearing 50 fitted in a bearing hole of the frame 1. A roller arm 52 is fitted to a protruding portion from the frame 1 while being restricted from moving in the axial direction by a nut 53. The roller arm 52 and a bearing 54 fixed to the free end of the roller arm on the other frame side (not shown) include a swimsuit roller 55 whose peripheral surface is in contact with the peripheral surface of the metering roller 12. The peripheral surface is pivotally supported so as to be detachably attached to the plate 2 of the plate cylinder 3, and the roller arm 52 is swung by a cam mechanism or the like (not shown) so that the swimsuit roller 55 is detachably attached to the plate surface. It is configured. An intermediate gear 56 and a roller gear 57 that mesh with each other are respectively mounted on the transmission shaft 49 and the end shaft of the swimsuit roller 55 so that the rotation of the transmission shaft 49 is transmitted to the swimsuit roller 55. Have been. A roller lever 58 is rotatably fitted on the shaft portion of the bearing 54, and a bridge roller contacting the swimsuit roller 55 is provided at a free end of the roller lever 58 and a roller lever on the other frame side. 59 are supported.

When the plate cylinder 3 rotates with the gear shaft 22 stopped, the number of teeth of each gear and the gear ratio of the differential devices 33 and 38 are adjusted so that the plate cylinder 3 and the swimsuit roller 55 rotate at the same peripheral speed. Are set, and in the present embodiment, these are set as follows.

Plate gear 4 ... 98T Drive gear 27 ... 40T Differential device 33 ... 81/80 Differential device 38 ... 51/50 Driven gear 28 ... 43T Intermediate gear 44 ... 36T Intermediate gear 56... 39T Roller gear 57... 40T As a result, when the gear shaft 22 is stopped, the plate cylinder 3
When rotated, the swimsuit roller 55 is 96/40 × 81/80 × 51/50 × 43 /
It rotates 36 × 39/40 ≒ 2.9 times, so if the ratio of the diameter of the plate cylinder 4 to the diameter of the swimsuit roller 55 is 2.9, the plate cylinder 4 and the swimsuit roller 5
5 rotates at the same peripheral speed. Actually, the diameter ratio is determined in advance, and the number of teeth is set from this.

The operation of the water supply device configured as described above will be described.
When a motor (not shown) is started, the plate cylinder 3 and a printing cylinder (not shown) such as an impression cylinder and a blanket cylinder rotate, and the water supply roller 8 and the metering roller 12 rotate. Further, the rotation of the plate cylinder 3 includes the plate cylinder gear 4, the drive gear 27, the differential 33, the differential 38, the driven gear 28,
Swimsuit roller via intermediate gear 44, intermediate gear 56, roller gear 57
It is transmitted to 55, which rotates. As the respective rollers rotate, the water 5 in the watercraft 6 is pulled up by the rotating water source roller 8 and adheres to the surface thereof, and the adhered water 5 is transferred to the metering roller 12. After being metered, it is transferred to the swimsuit roller 55 and supplied to the surface of the plate 2 by the swimsuit roller 55. During such a printing operation, since the motor 20 is stopped and the gear shaft 22 is stopped, the swimsuit roller 55 rotates approximately 2.9 times per rotation of the plate cylinder 3 as described above. The peripheral speed of the roller 55 is the same as the peripheral speed of the plate cylinder 3 and does not slip with each other.
The surfaces of the swimsuit roller 55 and the plate 2 do not wear.

When dust such as paper dust or ink residue adheres to the surface of the plate 2, when the motor 20 is started while the plate cylinder 3 is rotating, the gear shaft 22 rotates and the gear ratio of the differential devices 33, 38 Changes, the peripheral speed of the swimsuit roller 55 becomes different from the peripheral speed of the plate cylinder 3, and the peripheral surface of the swimsuit roller 55 and the surface of the plate 2 slide, so that the dirt adhering to the surface of the plate 2 is removed. You. In this embodiment, when the gear shaft 22 makes an X rotation, the swimsuit roller 55 is rotated by ｛(96/40 × 81/80 ± X / 80) × 51/50 per rotation of the plate cylinder 3.
Rotate ± X / 50｝ × 43/36 × 39/40 times.

In this case, since the motor 20 only drives the external gear 36 to rotate, the output may be small, and if the rotation of the motor 20 is constant regardless of whether the rotation of the machine is high or low, the plate cylinder 3 and the swimsuit The peripheral speed difference with the roller 55 is also constant.

The difference between the peripheral speeds of the plate cylinder 3 and the swimsuit roller 55 is required to be 10 m / min or more according to experiments. Therefore, two or more sets of differentials are required as in the embodiment. Further, the motor 20 may be a motor that rotates at a constant speed or a motor that can change the speed.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in a water supply device for a printing press, a driving gear that is gear-connected to a plate cylinder and a driven gear that is gear-connected to a swimsuit roller on a gear shaft that is driven to rotate by a motor. Gears are rotatably mounted at intervals, and on the gear shaft between these drive gears and the driven gears, the speed of the drive gear is changed and transmitted to the driven gears, and according to the rotation speed of the gear shaft. A plate cylinder / swimsuit including a differential device, in which a differential device having a variable gear ratio is interposed, and the peripheral speed of the plate cylinder and the peripheral speed of the swimsuit roller are substantially the same when the gear shaft is stopped. By setting the number of gear teeth between rollers, if the motor is stopped during printing work, the peripheral speed of the plate cylinder and the peripheral speed of the swimsuit roller will be the same speed and will not slip each other. Not only improves durability but also Of the deposit when the slip becomes only the plate cylinder and the circumferential speed is different speeds from one another with the dampening roller to rotate the other of the motor do not need to be synchronized with the motor of the machine,
Since dust can be removed, a motor with a small output is sufficient, and equipment and power costs can be reduced, installation space can be reduced, and the control circuit can be simplified. Further, since the peripheral speed difference between the plate cylinder and the swimsuit roller does not change regardless of the rotation speed of the machine, the operability is improved.

[Brief description of the drawings]

1 to 3 show an embodiment of a water supply device for a printing press according to the present invention. FIG. 1 is an exploded vertical sectional view, FIG. 2 is a cylinder arrangement diagram, and FIG. It is an expanded longitudinal sectional view. 3 ... plate cylinder, 4 ... plate cylinder gear, 20 ... motor, 22 ... gear shaft, 27 ... drive gear, 28 ... driven gear, 31 ... joint,
33,38… Differential device, 34… Plug, 35… Ball bearing, 36… External gear, 37A… Driving internal gear, 37B
… Driven internal gears, 44, 56… intermediate gears, 55… swimsuit rollers, 57… roller gears.

Claims (1)

(57) [Claims] A drive gear connected to a plate cylinder and a gear and a driven gear connected to a swimsuit roller and a gear are rotatably mounted on a gear shaft rotatably driven by a motor at an interval. On the gear shaft between the drive gear and the driven gear, a differential device in which the speed of the rotation of the drive gear is changed and transmitted to the driven gear to change the gear ratio according to the rotation speed of the gear shaft, and The number of teeth of the gear between the plate cylinder and the swimsuit roller including the differential device was set so that the peripheral speed of the plate cylinder and the peripheral speed of the swimsuit roller became substantially the same when the gear shaft was stopped. A water supply device for a printing press, characterized in that: