JPH05200994A - Cylinder cleaning apparatus for printing machine - Google Patents

Abstract

PURPOSE:To miniaturize the entire structure of the title apparatus and to make therewith smooth operation possible for winding and prevention of unwinding of a cleaning cloth by providing an operating member that operates a holding member to release the engagement between the holding member and a ratchet wheel while operating a member for making the cleaning cloth wound up with a winding shaft. CONSTITUTION:During operation for cleaning a rubber blanket cylinder 2, an air cylinder 25 is actuated and a rod 26 thereof is thrusted out, making a rocking lever 18 turn clockwise for supporting. Since the lever 18 is engaged with a one-way clutch 15 during such operation, a cleaning cloth 6 wound round a winding shaft 14 is taken up without being drawn toward the rubber blanket cylinder by occurrence of ink tack or the like to the cylinder. When the lever 18 is turned counterclockwise, a roller 20 makes a holding lever 30 swing counterclockwise, and a claw 30a is separated. As a result, engagement of the claw 30a and a claw 10a is released, enabling a ratchet wheel 10 to rotate. When the claw 30a and the claw 10a are engaged with each other, the ratchet wheel 10 does not turn by virtue of a one-way clutch 11, and the cleaning cloth 6 is not unwound. The cleaning cloth 6 can be unwound only when the engagement is released, and a new part of the cleaning cloth is unwound while making the used part wound up by the winding shaft 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a cylinder of a printing machine by pressing a cleaning cloth against the cylinder.

[0002]

2. Description of the Related Art Generally, a device of this type includes a pair of roll-shaped cloth guides which are rotatably supported by contacting with a peripheral surface of a cylinder, a cloth supply shaft for supplying a cleaning cloth to the cloth guides, and a cloth guide. A cloth take-up shaft having a take-up drive means for taking up the wash cloth from the cloth, and the take-up drive means intermittently takes up the wash cloth from the cloth supply shaft to the cloth take-up shaft and slides on the circumferential surface of the cylinder. This cleans the peripheral surface of the cylinder. In this case, when the cleaning cloth is wound on the downstream side of the cylinder, the cleaning cloth may be caught in the cylinder, and it is necessary to take measures on the cloth supply side so that the cleaning cloth is not pulled out except during winding.

Japanese Laid-Open Patent Publication No.
There is a device disclosed in 20349. The device disclosed herein includes a ratchet wheel attached to the shaft end of the cloth supply shaft, a claw that engages with the ratchet wheel, an air cylinder that attaches and detaches the ratchet wheel to and from the ratchet wheel, and the claw wheel is separated from the ratchet wheel. A rotation stop mechanism including a spring that biases the cloth supply shaft is provided on the cloth supply shaft. When the cleaning cloth is wound on the cloth winding shaft, the winding drive means of the winding shaft is driven to wind the cloth while the pawl is separated from the ratchet wheel by the urging force of the spring. Other than the above, the claw is engaged with the ratchet wheel against the biasing force of the spring by the operation of the air cylinder, and the rotation of the cloth supply shaft is blocked to prevent the cleaning cloth from being pulled out.

[0004]

However, in the above-mentioned conventional apparatus, in addition to the winding drive means, an air cinder as a dedicated drive means for driving the rotation stopping mechanism is required, and these devices are required. Since both driving means operate individually, means for interlocking them are required, and there are drawbacks that the entire device becomes large and the operation becomes complicated, and smooth operation cannot be obtained. Therefore, the present invention has been made in view of the above-described conventional drawbacks, and an object of the present invention is to reduce the size of the entire apparatus and obtain a smooth operation for preventing the cleaning cloth from being wound and pulled out. To provide a cleaning device for a cylinder of a printing machine.

[0005]

In order to achieve this object, a cylinder cleaning device for a printing machine according to the present invention comprises a cleaning cloth which comes into contact with a peripheral surface of a cylinder and slides, and a cloth winder for winding the cleaning cloth. A take-up shaft, a cloth supply shaft for supplying a cleaning cloth, a ratchet wheel coaxially mounted on the cloth supply shaft, a locking member for engaging and disengaging the ratchet wheel, and the cloth take-up shaft And a driven member which is coupled to the winding shaft by the one-way clutch and is coaxially mounted on the winding shaft, and the operating member is operated to wind the cleaning cloth around the cloth winding shaft and to activate the locking member. It is composed of a locking member and an actuating member which disengages the ratchet wheel.

[0006]

In the present invention, the locking member is normally locked to the ratchet wheel to prevent the cleaning cloth from being caught by the cylinder, and the rotation regulation of the cloth supply shaft is released in accordance with the operation of the operating member. At the same time, the cleaning cloth is wound by the cloth winding shaft.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show a cylinder cleaning device for a printing machine according to the present invention, FIG. 1A is a side view, FIG. 1B is a view showing a winding state of a cleaning cloth, FIG. It is a figure which shows the winding start of a cleaning cloth, and (b) is a figure which shows the winding completion of a cleaning cloth. In these drawings, reference numeral 2 is a blanket cylinder which is in contact with an impression cylinder (not shown), and a roll-shaped cloth guide 3 rotatably supported between frames (not shown) is provided on the peripheral surface of the blanket cylinder 2. 4 is in contact. A cleaning cloth 6 is stretched between the cloth guides 3 and 4 so as to be pressed against the peripheral surface of the blanket cylinder 2. The cleaning cloth 6 is supplied from a cloth supply shaft 8 and is wound by a winding device (not shown). The cloth is wound on the cloth winding shaft 14 which is rotationally driven by the driving means.

Reference numeral 10 denotes a ratchet wheel having a pawl 10a formed on its peripheral surface, which is mounted coaxially with the cloth supply shaft 8 and prevents the cloth supply shaft 8 from rotating in the direction in which the cleaning cloth 6 is fed. Is connected to the cloth supply shaft 8 by a one-way clutch. With the shaft 14a of the cloth winding shaft 14 as the swing shaft,
An approximately V-shaped swing lever 18 is swingably supported, and the swing lever 18 and the cloth winding shaft 14 are coupled by a one-way clutch 15 to form a cloth winding shaft 14.
Can be rotated only in the winding direction of the cleaning cloth 6.

A contact block 19 is attached to one end of the swing lever 18, and a roller 20 is provided on the rear surface of the other end. A tip of a rod 26 of an air cylinder 25 as an actuator is connected to the contact block 19, and the swing lever 18 is moved by the rod 26 that is driven to move back and forth from the air cylinder 25.
It swings around the shaft 14a.

Reference numeral 30 is a substantially T-shaped locking lever, which is a shaft 3
1 is swingably supported and has the ratchet wheel 1 at one end.
The claw portion 3 that engages with the claw 10a of 0 and prevents the cleaning cloth 6 of the claw wheel 10 from being rotated in the direction of feeding, that is, the counterclockwise direction in the drawing.
0a is provided, and a cam surface 30b on which the roller 20 of the rocking lever 18 slides is provided on the upper end surface. The compression spring 33 causes the locking lever 30 to move the shaft 3
1 in the clockwise direction in the figure, that is, the claw portion 30a
Is oscillated in a direction to engage with the claw 10a of the ratchet wheel 10.

Reference numeral 34 is a swing lever which is swingable about a shaft 34a. A stopper pin 35 and a roller 36 are mounted on one end of the lever so that the roller 36 is always in the opposite position so as to come into contact with the cloth winding shaft 14. When the cloth winding shaft 14 has a large winding diameter, the swinging lever 34 swings counterclockwise, and the stopper pin 35 moves counterclockwise. The swing amount of the swing lever 18 is regulated to be small, and the winding amount is adjusted so that a constant cleaning cloth can be wound regardless of the winding diameter.

The cylinder cleaning device for a printing machine according to the present invention is configured as described above, and its operation will be described below. During cleaning of the blanket cylinder 2, in order to wind the dirty cleaning cloth through the cloth guides 3 and 4 and to feed a new cleaning cloth,
The air cylinder 25 is operated and the rod 26 is advanced. When the rod 26 advances, the swing lever 18 swings counterclockwise. At this time, the swing lever 18 is
Since the take-up shaft 14 is coupled by the one-way clutch 15 so as to be rotatable in the counterclockwise direction, the cleaning cloth 6 wound around the take-up shaft 14 is not pulled out by the blanket cylinder 2 due to ink tack or the like. It is designed to be wound up.

When the swing lever 18 swings counterclockwise, the roller 20 slides on the cam surface 30b of the locking lever 30 and the locking lever 30 resists the urging force of the compression spring 33. By swinging clockwise, as shown in FIG. 2A, the pawl 30a is separated from the pawl portion 10a of the pawl wheel 10, the engagement between the pawl 30a and the pawl portion 10a is released, and the pawl wheel 10 is released. Can be rotated. The ratchet wheel 10 includes a cloth supply shaft 8
Is non-rotatably counterclockwise coupled by the one-way clutch 11, and when the claw 30a and the claw portion 10a are engaged, the cleaning cloth 6 is not pulled out, and when the engagement is released, the cleaning cloth 6 is supplied. The shaft 8 rotates in the counterclockwise direction together with the ratchet wheel 10, the cleaning cloth 6 is drawn out, new cleaning cloth is supplied, and the shaft 8 is wound around the winding shaft 14.

When the rod 26 has finished advancing, FIG. 2 (b)
, The swing lever 18 contacts the stopper pin 35 to complete the winding of the cleaning cloth 6, and then the rod 26
Starts to retreat, the swing lever 18 swings clockwise, and with this, the locking lever 30 also starts swinging clockwise due to the restoring force of the compression spring 33. When the roller 20 is disengaged from the cam surface 30b, the pawl portion 10a of the ratchet wheel 10 is engaged with the pawl 30a of the locking lever 30, and the ratchet wheel 10 is unidirectionally coupled so as to be unable to rotate counterclockwise. Clutch 11
Thus, the rotation of the cloth supply shaft 8 is stopped, and the cleaning cloth 6 cannot be pulled out except for winding the cloth. The above operation is repeated by intermittently advancing and retreating the rod 26.

In the present embodiment, the cylinder to be cleaned with the cleaning cloth 6 is the blanket cylinder 2, but the cylinder is not limited to this and can be applied to other printing cylinders or rotating rollers. In addition, the cleaning cloth 6 is provided with a pair of roll upper cloth guides 3,
Although it is made to abut on the peripheral surface of the blanket cylinder 2 by 4, it is not limited to this and may be made to abut by a pad, for example, and various design changes are possible. Further, although the rocking lever 18 and the locking lever 30 are interlocked with each other by the roller 20 and the cam surface 30b, the invention is not limited to this. For example, a link mechanism may connect the both, or the rocking lever may be used. Instead of 18, for example, a pinion may be mounted on the cloth winding shaft 14, a rod 26 may be provided with a rack that meshes with the pinion, and the locking lever 30 may be directly connected to the rod 26. In this case, the pinion and Locking lever 30
Does not need to be swingable, and the spring 33 for urging the locking lever 30 is unnecessary. It goes without saying that a rotary actuator can be adopted as the actuator instead of the air cylinder 26 as the actuator. Further, although the ratchet wheel 10 is connected to the cloth supply shaft 8 via the one-way clutch 11, it is needless to say that the same action and effect can be obtained even if they are integrally connected.

[0016]

As described above, according to the present invention, a cleaning cloth that abuts and slides on the peripheral surface of the cylinder, a cloth winding shaft that winds the cleaning cloth, and a cloth supply shaft that supplies the cleaning cloth. A ratchet wheel coaxially mounted on the cloth supply shaft, a locking member that engages and disengages the ratchet wheel, and a one-way clutch that is coupled to the cloth take-up shaft and is coaxial with the take-up shaft. An actuated member axially mounted on the upper side, the actuated member is actuated to wind the cleaning cloth around the cloth winding shaft, and the locking member is actuated to disengage the locking member and the ratchet wheel. The operation member for winding the cloth on the cloth winding shaft is also used as the operation member for canceling the rotation regulation of the cloth supply shaft, so that a dedicated operation member is not required, so that the apparatus is large in size. A single actuating member Supply and take-up of the cleaning cloth in association with the operation is performed, Thus, the effect of the winding and withdrawal operation of the prevention of smooth cleaning cloth in association operation is obtained.

[Brief description of drawings]

1A and 1B show a cylinder cleaning device for a printing machine according to the present invention, in which FIG. 1A is a side view and FIG. 1B is a view showing a wound state of a cleaning cloth.

FIG. 2 shows an operating state of a cylinder cleaning device for a printing machine according to the present invention, in which (a) is an operation diagram of starting cleaning cloth winding;
FIG. 7B is an operation diagram of the completion of winding the cleaning cloth.

[Explanation of symbols]

 2 blanket cylinder 6 cleaning cloth 8 cloth supply shaft 10 claw wheel 14 cloth winding shaft 18 swing lever 20 roller 26 actuator 30 locking lever 30b cam surface

Claims (1)

[Claims] 1. A cleaning cloth that abuts and slides on a peripheral surface of a cylinder, a cloth winding shaft that winds the cleaning cloth, a cloth supply shaft that supplies the cleaning cloth, and a shaft mounted coaxially with the cloth supply shaft. A fixed ratchet wheel, a locking member that engages and disengages with the ratchet wheel, and an actuated member that is coupled to the cloth winding shaft by a one-way clutch and is coaxially mounted on the winding shaft. The operating member is operated to wind up the cleaning cloth on the cloth winding shaft, and the operating member is operated to disengage the engaging member from the ratchet wheel. Cylinder cleaning device for printing machines.