JPH082645B2 - 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 being developed, and a device that can be put to practical use is appearing.
As shown in the figure, the impression cylinder 6 of the offset sheet-fed printing press has
Since the claws 11 for gripping the paper are provided in a state of protruding from the surface of the impression cylinder, this hinders automatic cleaning of the impression cylinder, and the impression cylinder is manually cleaned.

However, the space around the impression cylinder 6 was small, and the work of the middle waist was forced. 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 because there is no escape mechanism for the claw part (claw and claw shaft as a mechanism attached to the claw) of the impression cylinder.
In the present invention, in order to avoid direct contact between the claw portion and the cleaning device, a claw escape cam is provided to solve this problem.

[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 nail shaft was nailed so that the cleaning cloth did not touch the nail part. An attempt is made to solve this by providing an escape cam.

[Action]

In the present invention, when cleaning the claw portion of the impression cylinder,
Since the pressure contact portion of the cleaning cloth is lifted by the cam provided on the nail shaft from the claw and the body, the cleaning cloth is prevented from being damaged by the claw. At this time, if the cleaning cloth is pressed against the impression cylinder by a blade as a pressure-bonding member for pressing the cleaning cloth against the impression cylinder, the contact area with the impression cylinder is small, so that the vicinity of the claw portion, which is the protrusion, can be cleaned. It is possible and almost all of the unwiping residue can be eliminated.

〔Example〕

 An embodiment 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 2 and the take-up roll 3 of the cleaning cloth 1 are configured in the same manner as the conventional ones, but an example is shown in which a blade 7 is used instead of the pad as the pressure bonding device. That is, the cleaning device includes a cleaning cloth 1 for directly removing dirt on the impression cylinder 6, a magazine roll 2 from which the cleaning cloth 1 is unwinding step by step, and a winding cloth for winding and holding the cleaning cloth. For holding the take-up roll 3, the blade 7 for pressing the cleaning cloth to the impression cylinder, the nozzle 5 provided in the cleaning liquid supply pipe 4 as a means for wetting near the cleaning cloth, and the blade 7 and the cleaning liquid supply pipe 4. Holding body 8, magazine roll 2, winding roll 3, and frame body 9 for supporting the holding body 8.
The claw mechanism mounting recess 6a of the impression cylinder 6 is provided with a claw shaft 10 and a claw 11 attached to the claw shaft 10, and the claw shaft 10 is further provided with a claw escape cam 12. Further, in order to prevent the cleaning device from coming into contact with the impression cylinder at least during high-speed rotation, an air cylinder as a moving system for removing the device from the impression cylinder and a 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 1 to the body 6 by the blade 7 may be performed by an appropriate means.

Specifically, each component of this embodiment will be described below.

Cleaning cloth 1 A cloth that directly contacts the impression cylinder and removes dirt from the impression cylinder. It has a solvent-retaining ability and uses a non-woven fabric having lipophilicity and hydrophilicity.

Magazine roll 2 Equipped with a mechanism that allows the cloth to be easily put on and taken off as it is on the roll, and when the cleaning cloth is unwound gradually from the magazine roll,
It has a braking mechanism to prevent it from loosening.

Take-up roll 3 The used roll can be easily attached and detached, and the winding direction is against the rotation of the impression cylinder.

Cleaning cloth pressure-bonding member 7 In this embodiment, a blade-shaped member is used, but other members may be used.

Means (nozzle) 5 for squeezing the cleaning cloth with the cleaning liquid 5 A mechanism is provided for improving the cleaning effect by moistening the cleaning cloth with the cleaning liquid, and for preventing the cleaning liquid from being sprayed other than on the impression cylinder.

Holding body 8 The blade is held, and the blade is pressed against the cleaning cloth with a constant pressure and a constant angle. Further, the cleaning liquid nozzle is held and the cleaning liquid is sprayed onto the cleaning cloth at a constant angle.

Claw escape cam 12 At least two claw escape cams 12 having a larger surface contour than the claws are fixed to the claw shaft 10 near the claw 11. As the material, reinforced plastic and light metal are used. Further, the cam may be such that the cleaning cloth 1 can smoothly pass over the claw portion even if only the tip of the claw 11 comes into contact.

Since the cleaning apparatus according to the present invention is configured as described above, in cleaning the impression cylinder, the cleaning cloth 1 pressed by the blade 7 is guided along the surface of the nail escape cam 12 in the nail portion. In this case, the nail 11 is not contacted.

〔The invention's effect〕

In the present invention, by providing the claw escape cam on the claw shaft of the impression cylinder, the cleaning cloth moves over the claw portion without contacting, so that it is possible to prevent the cleaning cloth from being damaged by the claw. It is possible to automate the impression cylinder cleaning, which had to be performed in step 1, and it is possible to shorten the cleaning time and improve the production efficiency of the printing machine. further,
By using a blade as a crimping device (means) for the cleaning cloth, the contact area between the cleaning cloth and the impression cylinder can be reduced, so that the claws of the impression cylinder can be cleaned without wiping.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which the cleaning apparatus 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 ... cleaning cloth, 2 ... magazine roll 3 ... winding roll, 4 ... cleaning liquid supply pipe, 5 ... nozzle, 6 ... impression cylinder, 7 ... blade, 8 ... holding body, 9 ... Frame body, 10 …… claw shaft, 11 …… claw, 12 …… claw escape cam.

Claims (1)

[Claims] 1. A cleaning cloth for removing dirt from an impression cylinder, a magazine roll in which the cleaning cloth is unwound in a stepwise manner, a winding roll for winding the cleaning cloth, and an unwinding operation from the magazine roll. A cleaning liquid supply means for squeezing the washed cleaning cloth with a cleaning liquid; a pressure-bonding member for pressing the cleaning cloth against the impression cylinder; and a pressing shaft of the cleaning cloth on the claw shaft of the impression cylinder to contact the claw of the impression cylinder. An offset sheet-fed printing press impression cylinder cleaning apparatus, which is provided with a pair of claw escape cams that guide the user to move without movement.