JPH02187336A - Water feeder for printing machine - Google Patents

Abstract

PURPOSE:To make the circumferential speed of a water application roller equal to that of a plate cylinder, to prevent the slippage of peripheries and to protect the periphery of the water application roller and the surface of a plate from being worn by setting the tooth number of gears between the plate cylinder including differential gears and the water application roller so that the circumferential speed of the plate cylinder and that of the water application roller become nearly equal when a gear shaft is stopped. CONSTITUTION:The tooth number of each gear and the change gear ratio of the differential gears 33 and 38 are set so that the plate cylinder 3 and the water application roller 55 can rotate at the sane circumferential speed when the plate cylinder 3 rotates, with the gear shaft 22 stopped. Therefore, the circumferential speed of the water application roller 55 becomes equal to that of the plate cylinder 3, and both of than do not slip, whereby their surfaces are not worn even after they rotate for a long time. When dust such as paper powder or ink residue attaches to the surface of the plate 2, a motor 20 is started, with the plate cylinder 3 rotating. Then, the gear shaft 22 rotates to vary the change gear ratio of the differential gears 33 and 36; therefore the circumferential speed of the water application roller 55 becomes different from that of the plate cylinder 3 to make slippery the periphery of the water application roller and that of the plate 2. As a result, the dust attaching to the surface of the plate 2 can be removed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a printing press in which dampening water in a °C1 water tank is transferred between a plurality of rollers and then supplied to the plate surface on a plate cylinder by a dampening roller. The present invention relates to a water supply device, and particularly to a water supply device that is also used as a dust removal device for a plate cylinder.

(Prior Art) In a lithographic printing press, an image is formed on the surface of a plate mounted on the circumferential surface of a plate cylinder using ink and dampening water (hereinafter referred to as water) supplied by an inking device and a water supply device. This image is then transferred directly or via a blanket cylinder to a sheet of paper passing between the cylinders for printing.

In such printing operations, the dried film of the ink mixes with the ink and sticks to the plate surface, and paper dust generated when cutting the supplied paper scatters and adheres to the plate surface. Continuing to do this will result in a printing failure in which white dots appear in the printed area.

In order to prevent this printing failure from occurring, various types of dust removal devices have been proposed and used to remove dust such as ink scum and paper dust.

Conventional dust removal devices of this type have a dust removal rod that is movable forwards and backwards and is inserted between the inking device and the water supply device, and a doctor blade at the tip of the rod is pressed against the plate surface on the rotating plate cylinder. A device that removes dust, or a cloth wrapped around a drum instead of a doctor blade, which is pressed against the plate surface and wound up each time dust is removed, is used.

However, with such conventional dust removal devices, each time a print problem occurs, the dust removal rod must be moved back and forth in a narrow work space while searching for the spot where the dust has adhered, which is cumbersome to operate and reduces work efficiency. Not only is this a problem in terms of safety, but it also requires specialized equipment, which increases equipment costs and occupies more space.

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

[Problems to be Solved by the Invention] However, since the conventional water supply device that is also used as such a dust removal device constantly keeps the plate cylinder and the swimsuit roller at different speeds, There was a problem in that the plate continued to slip between the roller and the swimsuit roller, accelerating the wear of the plate.

In addition, a method has been proposed in which the swimsuit roller is driven by a motor separate from the plate cylinder and the speed is changed only when removing dust, but in this case, a high-output motor is required because the torque to drive the swimsuit roller is large. However, there are problems in that the cost is high and the machine motor for the plate cylinder and the motor for the bathing roller have to be rotated synchronously, resulting in poor operability. Furthermore, in all of these devices, although the circumferential speed ratio between the plate cylinder and the swimsuit roller is constant, there is a problem in that when the speed of the machine changes, the difference in circumferential speed between the plate cylinder and the swimsuit roller changes. .

[Means to solve the problem]

In order to solve this problem, the present invention has a driving gear connected to the plate cylinder and a driven gear connected to the swimwear roller at intervals on a gear shaft rotationally driven by a motor. A plurality of sets are freely rotatably mounted on the gear shaft between the driving gear and the driven gear, and the rotation of the driving gear is changed in speed and transmitted to the driven gear, and the gear ratio changes according to the rotation speed of the gear shaft. In addition to installing a differential device, the gear between the plate cylinder and the swimsuit roller including the differential device is installed so that the circumferential speed of the plate cylinder and the swimsuit roller are the same speed when the gear shaft is stopped. The number of teeth was set.

[For production]

During printing, water in the water tank is transferred between a plurality of rollers and then supplied to the printing plate by the water roller. in this case,
Since the motor is stopped and the gear shaft is stopped, the speed change by the gear and differential allows the circumferential speed of the swimsuit roller that is in contact with the printing plate to be at the same speed as the circumferential speed of the printing cylinder, so that the circumferential surfaces are at the same speed. will not slip, and the circumferential surface of the swimwear roller and printing surface will not wear out.

When dust adheres to the printing plate, when the motor is rotated, the peripheral speed of the swimsuit roller is changed by the action of the differential to a speed that is different from the peripheral speed of the printing cylinder, so the peripheral surfaces may slip against each other and the dust can be removed. The difference in circumferential speed between the plate cylinder and the swimwear roller does not change whether the machine is rotating at high speed or low speed.

〔Example〕

1 to 3 show an embodiment of the water supply device for a printing press according to the present invention, FIG. 1 is an expanded longitudinal sectional view thereof, FIG. 2 is a cylinder arrangement diagram, and FIG. 3 is a diagram of a differential gear. It is an enlarged longitudinal cross-sectional view. In the figure, a plate cylinder 3 with a plate 2 attached to its circumferential surface is rotatably driven and supported by the left and right frames l from the driving side, and a plate cylinder gear 4 is mounted on the shaft end of the plate cylinder 3. has been
On the side of the plate cylinder 3, a water cannon 6 in which dampening water 5 (hereinafter referred to as water 5) is stored is supported between the left and right frames 1. A roller arm 7 is rotatably supported on the left and right frames l, and at the free ends of these left and right roller arms 7, a water base roller 8 that is rotationally driven from the driving side is mounted inside the water boat 6. The lower part is immersed in water 5 and is rotatably supported. In addition, a lever 1 is connected between the stud 9 that is bolted to the left and right frames l and the roller arm 7.
Another roller arm 11 connected at 0 is rotatably supported, and a metering roller 12 is mounted on a bearing portion at its free end, with its circumferential surface facing the circumferential surface of the water base roller 8. It is rotatably supported.

A base 13 is supported by a plurality of stays 14, 15, 16 and projects from the frame 1 on one side, and a motor stand 17 is fixed to the outer surface of the base 13 with bolts 19 via a bearing retainer 18. There is.

A motor 20 is bolted to the motor stand 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. This gear shaft 22 includes a ball bearing 24 fitted into a hole in the base 13 and held down by a bearing holder 18, and a frame l.
Both ends are rotatably supported by ball bearings 26 fitted into inner holes of the bearing case 25 on the side, and a driving gear 27 and a driven gear 28 are mounted on the gear shaft 22. and the base 13, respectively, via ball bearings 29 and 30 so as to be freely rotatable. Reference numeral 31 denotes a joint that is divided in the axial direction and joined with bolts, and is located in the middle of both gears 27 and 28, and rotates on the gear shaft 22 via a ball bearing 32 and a member of a differential device to be described later. A differential device, generally designated by the reference numeral 33, is interposed between the joint 31 and the drive gear 27. This differential device 33 includes a plug 34 whose peripheral surface is formed into an elliptical shape and is key-fixed to the gear shaft 22, and an outer ring which is formed into an elliptical shape from an elastic material and is fitted and fixed onto the elliptical peripheral surface of the plug 34. a pair of ball bearings 35, an externally toothed gear 36 which is formed into an annular shape from thin-walled special steel having elasticity and has external teeth, and is fitted into the ball bearing 35 in a state of elastic deformation into an oval shape; An annular drive-side internal tooth gear 37A having internal teeth that mesh with the external teeth of the gear 36 and fixed to the drive gear 27 with bolts; It is a differential device formed by an annular driven internal gear 37B fixed with a bolt, and the external gear 36 and the driven internal gear 37B are of the same pitch as the driving internal gear 37A. It has two fewer teeth than the 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 elliptical long shaft portion meshes with the drive gear 27. External gear 36
rotates, the driven internal gear 37B that meshes with the long sleeve portion of the external gear 36 rotates, and the joint integral therewith rotates.

In this embodiment, the number of external and internal teeth is set such that when the drive gear 27 rotates once while the gear shaft 22 is stopped, the joint 31 rotates 81/80 times.

From this state, by rotating the gear shaft 22 with the motor 20, the gear ratio of the differential device 33 changes from 81/80 to 81/80 according to the rotation speed X. It is configured to change by +X/80.

Furthermore, a differential device 3 is provided between the joint 31 and the driven gear 28.
A differential bag M38 having the same configuration as 3 is provided on the gear shaft 22, and in this embodiment, when the joint 31 rotates once with the gear shaft 22 stopped by setting the number of external and internal teeth, The driven gear 28 is configured to rotate 51,150 times.

Then, by rotating the gear shaft 22 with the motor 20, the gear ratio of the differential device 38 changes from 51150 to 51150+X150 according to the rotation speed X. 39
．． 40 is a thrust bearing, and 41 is a transmission gear fitted on the stay 14 to transmit the rotation of the plate cylinder gear 4 to other devices.

On the other hand, an intermediate gear 44 that meshes 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. A coupling 48 is attached to the bearing holder 47 bolted to the plane of the intermediate gear 44.
are fixed concentrically. A transmission shaft 49 is inserted into a hole of the coupling 48 and fixed with a key, and is rotatably supported via a bearing 51 by a bearing 50 fitted into a bearing hole of the frame l. A roller arm 52 is fitted into the protrusion from the frame l with a nut 53 to restrict its movement in the axial direction. A bearing 54 fixed to the free end of this roller arm 52 and a roller arm on the other frame side (not shown) has a swimsuit roller 55 whose circumferential surface is in contact with the circumferential surface of the metering roller 12.
is rotatably supported with its circumferential surface removably in contact with the plate 2 of the plate cylinder 3, and by swinging the roller arm 52 with a cam mechanism (not shown) or the like, the swimsuit roller 55 is attached to and detached from the plate. It is configured as follows. An intermediate gear 56 and a roller gear 57 that mesh with each other are respectively attached to the transmission shaft 49 and the end shaft of the swimsuit roller 55.
It is configured such that 90 rotations are transmitted to the swimsuit roller 55.

A roller lever 58 is rotatably fitted to the shaft of the bearing 54, and a bridge roller that is in contact with the swimwear roller 55 is attached to the free end of the roller lever 58 and the roller lever on the other frame side. 59 is pivotally supported.

The number of teeth of each gear and the gear ratio of the differential device 33 to 38 are adjusted so that when the plate cylinder 3 rotates while the gear shaft 22 is stopped, the plate cylinder 3 and the swimsuit roller 55 rotate at the same circumferential speed. In this embodiment, these are set as follows.

Plate cylinder gear 4...98T Drive gear 27...40T Differential device 33...81/80 Differential device 38...51150 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 is
When rotated, the swimsuit roller 55 is 96/40 x 81/8
0 x51150 x43/36 x39/40ζ2.
Since it rotates nine times, if the ratio of the diameter of the plate cylinder 4 and the diameter of the swimsuit roller 55 is 2.9, the plate cylinder 4 and the swimsuit roller 55 rotate at the same circumferential speed. In reality, the diameter ratio is determined first, and the number of teeth is determined from this.

The operation of the water supply device configured as described above will be explained. When the motor (not shown) is started, the printing cylinders such as the plate cylinder 3 and the impression cylinder (not shown) and the blanket cylinder (not shown) rotate, and the water source roller 8 and metering roller rotate. 12 rotates.

Furthermore, the rotation of the plate cylinder 3 is controlled by the plate cylinder gear 4. Drive gear 27, differential device 33. Differential device 38. Driven gear 28° Intermediate gear 4
4. Intermediate gear 56. Swimsuit roller 5 via roller gear 57
5, which rotates.

As each roller rotates in this manner, the water 5 in the water boat 6 is pulled up by the rotating water base roller 8 and adheres to its surface, 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 printing work, since the motor 20 is stopped and the gear shaft 22 is stopped, the swimsuit roller 55 rotates 2.9 times for each rotation of the plate cylinder 3, as described above. Therefore, the circumferential speed of the swimsuit roller 55 is the same as the circumferential speed of the plate cylinder 3, so that they do not slip against each other, and even if they continue to rotate for a long time, the swimsuit roller 5
5 and the surface of plate 2 will not wear out.

When dust such as paper powder or ink scum is attached 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 device 33, 38 is changed. changes, and the circumferential speed of the swimsuit roller 55 becomes the plate 111;! 3
Since the circumferential speed of the swimsuit roller 55 and the surface of the plate 2 slide, dust adhering to the surface of the plate 2 is removed. In this embodiment, when the gear shaft 22 rotates by X, the swimsuit roller 55 rotates ((96/
40x 81/80±X/80)
±X150) X 43/36X Rotate 39/40 times.

In this case, since the motor 20 only rotates the external gear 36, a small output is required.Also, regardless of whether the machine rotates at high or low speed, if the rotation of the motor 20 is constant, the plate cylinder
The circumferential speed difference between the swimsuit roller 55 and the swimsuit roller 55 is also constant.

According to experiments, the difference in circumferential speed between the plate cylinder 3 and the swimsuit roller 55 is required to be 10 m/min or more, so 2&[1 or more differential devices are required as in the embodiment.

Further, the motor 20 may be one that rotates at a constant speed or may be one that can change speed.

[Effects of the Invention] As is clear from the above description, in the water supply device of a printing press according to the present invention, a drive gear connected to a plate cylinder and a swimsuit roller are mounted on a gear shaft rotationally driven by a motor. A gear-connected driven gear is freely rotatably mounted at intervals, and the rotation of the driving gear is transmitted to the driven gear at a variable speed on the gear shaft between the driving gear and the driven gear. In addition to interposing multiple sets of differential gears whose gear ratios change according to the rotation speed of the By setting the number of gear teeth between the plate cylinder including the device and the swimsuit roller, if the motor is stopped during printing, the circumferential speed of the plate cylinder and the swimsuit roller will be at the same speed, allowing them to move toward each other. Since they do not slip, they do not wear out, improving durability. In addition, when dust accumulates, the circumferential speed of the plate cylinder and swim roller can be adjusted by simply rotating a separate motor that does not need to be synchronized with the motor of this machine. Since they can slide at different speeds and remove dirt, a small output motor is required, reducing equipment and electricity costs, reducing installation space, and simplifying the control circuit. .

Furthermore, the difference in circumferential speed between the plate cylinder and the swimsuit roller does not change regardless of the rotational speed of the machine, improving operability.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the water supply device for a printing press according to the present invention, FIG. 1 is an expanded longitudinal sectional view thereof, FIG. 2 is a cylinder arrangement diagram, and FIG. 3 is a diagram of a differential gear. It is an enlarged longitudinal cross-sectional view. 3... Plate cylinder, 4... Plate cylinder gear, 20... Motor, 22... Gear shaft, 27... Drive gear, 2
8... Driven gear, 31... Joint, 33.38.
... Differential device, 34 ... Plug, 35 ... Ball bearing, 36 ... External gear, 37A ...
・Drive side internal gear, 37B... Driven side internal gear, 4
456...Intermediate gear, 55...Swimsuit roller, 5
7...Roller gear. Patent applicant: Komori Printing Machinery Co., Ltd. Agent: Masaki Yamakawa (and two others)

Claims (1)

[Claims] On a gear shaft rotationally driven by a motor, a driving gear connected to the plate cylinder and a driven gear connected to the swimwear roller are rotatably mounted at intervals, and these driving gear and driven gear A plurality of sets of differential devices are interposed on the gear shaft between the gear shaft and the gear shaft. The number of teeth of the gear between the plate cylinder and the swimsuit roller including the differential device is set so that the circumferential speed of the plate cylinder and the swimsuit roller are approximately the same speed when the shaft is stopped. Features of printing press water supply device.