JPH0739175B2 - Offset sheet-fed press Impressor cleaning device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cleaning device for an impression cylinder of an offset sheet-fed printing press.

[Prior Art] A blanket cylinder cleaning device for an offset printing machine is under development, and a device that can be put to practical use has appeared.
As shown in the figure, the impression cylinder 1 of the offset sheet-fed printing press has
Claw shaft 2 provided in claw mechanism mounting recess 1a for gripping paper
Since the claws 3 attached to the claw 3 are provided so as to project from the surface of the impression cylinder 1, even if the cleaning cloth is pressed against the impression cylinder between the magazine roll and the take-up roll to clean dirt, It became difficult to clean the impression cylinder automatically, and the impression cylinder was cleaned manually.

However, the space around the impression cylinder was small, and I was forced to work on the middle waist. In addition to this, it is necessary to perform cleaning while rotating the impression cylinder at least at low speed, which is dangerous. Further, since dirt is stuck to the surface, it is difficult to clean it, and a long cleaning time is required, which is one of the factors that reduce the production efficiency of the printing machine.

[Problems to be solved by the invention]

The reason why the blanket cylinder cleaning device of the printing machine cannot be used for impression cylinder cleaning is that there is no escape mechanism for the claw portion (claw and claw shaft as a mechanism attached to the claw) of the pressure cylinder, and therefore the present invention In order to avoid the direct contact between the claw portion and the cleaning device, the problem is solved by providing a claw escape means.

[Means for solving problems]

Until now, there was no device for cleaning the impression cylinder of the offset sheet-fed printing press because there was a problem in how to deal with the nail part, so the cleaning cloth pressure contact part so that the cleaning cloth does not contact the nail part. To solve this problem by providing a claw escape means for lifting the claw, it is necessary to press the blade with a blade so that it can clean the vicinity of the claw part that is protruding and difficult to clean without leaving a gap, and keep the cleaning cloth in contact with the surface of the impression cylinder. Therefore, it is intended that the cleaning be effectively performed.

[Action]

According to the present invention, when the claw portion of the impression cylinder is washed, the claw relief means for lifting the pressure contact portion of the cleaning cloth is provided so that the pressure contact portion of the cleaning cloth is lifted, so that the cleaning cloth is prevented from being damaged by the nail. Together with this, by using a blade as a means for crimping the cleaning cloth to the impression cylinder,
The vicinity of the claw, which is the protrusion, can be cleaned, and the guide part provided on the take-up roll side keeps the cleaning cloth in contact with the impression cylinder and holds dirt, so you can eliminate unwiping. The effect is improved.

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view showing a state in which the cleaning device according to the present invention is pressed against an impression cylinder, and FIG. 2 is a side sectional view of a claw portion of the impression cylinder. The magazine roll 5 and the take-up roll 6 of the cleaning cloth 4 are The structure is similar to that of the conventional device, but instead of the pad as the crimping device, the blade 8 is attached to one end of the mountain-shaped support 7.
The cleaning cloth 4 delivered from the magazine roll 5 is linearly pressed against the surface of the impression cylinder 1 along the generatrix line, and the other end located on the take-up roll side serves as the guide portion 9 and the impression cylinder 1 is formed by the blade 8. The cleaning cloth 4 pressed against the wire in an arc shape along the circumference of the impression cylinder.
It is constructed so that it is pressed and guided so that a pressure contact portion is formed on 10 and then wound by a winding roll 6. That is, the cleaning apparatus according to the present invention includes a cleaning cloth 4 for directly removing dirt on the impression cylinder 1, a magazine roll 5 from which the cleaning cloth 4 is unwound in a stepwise manner, and a cleaning cloth is wound and held. Take-up roll 6 and blade 8 for pressing the cleaning cloth onto the impression cylinder
And holding the nozzle 12 provided in the cleaning liquid supply pipe 11 as a means for wetting near the cleaning cloth, the blade 8 and the cleaning liquid supply pipe 11, and holding the cleaning cloth on the winding side in contact with the impression cylinder surface. The guide 7 is provided with a mountain-shaped support 7, a magazine roll 5, a take-up roll 6 and a frame 13 for supporting the support 7. The claw mechanism mounting recess 1a of the impression cylinder 1 has a claw. A shaft 2 and a claw 3 attached to the shaft 2 are provided, and a claw escape cam 14 is further provided on the claw shaft 2. Further, in order to prevent the cleaning device from coming into contact with the impression cylinder at the time of high-speed rotation, at least the air cylinder as a moving system for removing the device from the impression cylinder and the cleaning cloth are moved stepwise. In addition, a one-way clutch and an air cylinder are used for winding and winding, but the mechanism is well known, so the illustration is omitted. The pressing movement of the cleaning cloth 4 to the body 1 by the blade 8 may be performed by an appropriate means. In the figure, reference numeral 15 is a rotary support shaft for bringing the frame body 13 into and out of contact with the impression cylinder 1.

The respective components of this embodiment will be specifically described as follows.

Cleaning cloth 4 A cloth that directly contacts the impression cylinder to remove dirt from the impression cylinder. It has the ability to retain solvent and water and uses a non-woven fabric that is lipophilic and hydrophilic.

Magazine roll 5 A mechanism is provided for easily attaching and detaching the cloth in a roll state, and a brake mechanism is provided so that the cleaning cloth does not come loose when it is unwound step by step from the magazine roll.

Take-up roll 6 The used roll can be easily attached and detached, and the winding direction is against the rotation of the impression cylinder.

Cleaning cloth pressing means In this embodiment, the blade 8 is attached to one end of the chevron-shaped support 7 and the other end of the cleaning cloth 4 is used as the guide portion 9.
The cleaning cloth 4 is kept in arc contact with the impression cylinder circumferential surface.
The blade 8 and the guide portion 9 may be separately mounted and fixed to the frame body 13 without using.

Means for squeezing the cleaning cloth with the cleaning liquid The cleaning liquid is supplied to the cleaning liquid supply pipe 11 and the nozzle 12 to improve the cleaning effect by moistening the cleaning cloth, and a mechanism for preventing the cleaning liquid from being sprayed on other than the impression cylinder is provided. In the embodiment, it is attached to the back surface of the mountain-shaped support 7, but it can be provided at an appropriate position.

Chevron-shaped support 7 holds the blade 8 at one end and uses the other end as a guide portion 9,
The cleaning cloth 4 is pressed against the impression cylinder 1, a cleaning liquid nozzle is attached, and the cleaning liquid is injected into the cleaning cloth.

Claw escape cam 14 Claw escape cam as a nail escape means for lifting the pressure contact portion of at least two cleaning cloths having a surface outer shape larger than a nail
14 is fixed to the claw shaft 2 near the claw 3. The material is reinforced plastic, light metal, etc. Further, the cam may be such that the cleaning cloth 4 can smoothly pass over the claw portion even if only the tip of the claw 3 is contacted.

Since the cleaning apparatus according to the present invention is configured as described above, in cleaning the impression cylinder, the cleaning cloth 4 pressed by the blade 8 is guided along the surface of the nail escape cam 14 in the nail portion. In other words, since the cleaning cloth 4 is not in contact with the claws 3 and the cleaning cloth 4 is kept in contact with the surface of the impression cylinder for a while, the risk of retransfer of dirt can be eliminated and the cleaning effect can be improved.

〔The invention's effect〕

In the present invention, the claw shaft of the impression cylinder is provided with the claw escape cam, and the blade is adapted to press the cleaning cloth linearly from the back surface of the cleaning cloth in the axial direction of the impression cylinder surface. Not only can the body surface be washed without leaving any portion, but since the cleaning cloth moves over the claw portion without contacting it, damage to the cleaning cloth by the nail can be prevented. To further explain, when the cleaning cloth is pressed against the impression cylinder only by the blade, even if the processing accuracy of the blade is increased, the pressing force uniformity in the width direction may be inevitable. Therefore, uneven press contact was inevitable, but in addition to pressing with the blade, the winding roll 6
Since the cleaning cloth comes into contact with the impression cylinder in an arc shape by the guide portion 9 provided on the side, the retention of cleaning liquid and dirt is improved, and the accuracy of wiping uniformity in the width direction is improved, and the cleaning effect is improved. improves. When the cleaning cloth is pressed along the surface of the impression cylinder with one or two rolls, a pad, or the like for cleaning, the frictional resistance is large and a large amount of power is required. However, according to the present invention, The cleaning cloth portion that is linearly pressed by the blade on the impression cylinder can reduce the total friction resistance because the pressing area is small, and the friction resistance is small at the portion where the cleaning cloth is in surface contact with the impression cylinder surface. Since the frictional resistance as a whole can be made smaller than the conventional one, the cleaning cloth 4 can be rolled up and moved while the cleaning device is being crimped onto the impression cylinder 1, and the cleaning time can be shortened, and a small, lightweight, inexpensive device can be obtained. To be

Therefore, it is possible to automate the impression cylinder cleaning, which conventionally had to be done manually, and it is possible to shorten the cleaning time and improve the production efficiency of the printing machine.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which the cleaning device according to the present invention is pressed against an impression cylinder, and FIG. 2 is a side sectional view of a claw portion of the impression cylinder. 1 ... impression cylinder, 2 ... claw shaft, 3 ... claw, 4 ... cleaning cloth, 5 ... magazine roll, 6 ... take-up roll, 7 ... chevron-shaped support, 8 ... blade, 9 ...... Guide part, 10 ...... arc pressure contact part, 11 …… cleaning liquid supply pipe, 12 …… nozzle, 13 …… frame body, 14 …… claw relief cam.

Claims (1)

[Claims] 1. A cleaning cloth for cleaning an impression cylinder is moved from a magazine roll to a take-up roll and, at the same time, while supplying a cleaning liquid, the cleaning cloth is linearly pressed against the impression cylinder by a blade, and is further wound with the blade. A cleaning cloth is stretched between the guide provided on the front side of the roll, and when cleaning the impression cylinder, the cleaning cloth also comes into surface contact along the surface of the impression cylinder. An offset sheet-fed printing press impression cylinder cleaning apparatus, which is provided with a claw escape means for lifting a pressure contact portion of the cleaning cloth in order to avoid contact between the portion and the cleaning cloth.