JP2796721B2 - Offset sheet-fed printing press impression cylinder cleaning device - Google Patents

Description

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

[Conventional technology]

Development of a blanket cylinder cleaning device for an offset printing press has been progressing, and some devices that can withstand practical use have appeared. However, as shown in FIG. 4, a claw for gripping paper is provided on an impression cylinder 1 of an offset sheet-fed printing press. Since the pawl 3 attached to the pawl shaft 2 provided in the mechanism mounting recess 1a is provided so as to protrude from the surface of the impression cylinder 1, the cleaning cloth is pressed against the impression cylinder between the magazine roll and the take-up roll. Even if you try to clean the dirt, the nail 3 is in the way and it is difficult to clean the impression cylinder automatically.
The impression cylinder was cleaned manually.

In addition, the space around the impression cylinder was narrow, and work had to be performed from the center. In addition to this, it is necessary to perform cleaning while rotating the impression cylinder at least at a low speed, which is dangerous. In addition, cleaning is difficult due to sticking of dirt, and a long cleaning time is required, which has been one of the causes of lowering the production efficiency of the printing press.

For this reason, a cleaning apparatus as disclosed in Japanese Patent Application Laid-Open No. 63-92456 has been devised. To explain this,
As shown in FIG. 3 as a side sectional view showing a state of being pressed against the impression cylinder of the cleaning device, the magazine roll 5 and the take-up roll 6 of the cleaning cloth 4 are attached to the frame 3, and As a wire crimping device, a blade 8 is provided at one end of a mountain-shaped support 7 also attached to the frame 3, and the cleaning cloth 4 sent out from the magazine roll 5 is linearly pressed against the impression cylinder 1 to take up a roll. After the other end located on the side is a guide portion 9, the cleaning cloth 4, which is linearly pressed against the impression cylinder 1 by the blade 8, is pressed and guided so as to form an arc-shaped press contact portion 10 along the circumference of the impression cylinder. ,
It is configured to be wound by a winding roll 6. That is, a cleaning cloth 4 for directly removing dirt from the impression cylinder 1 and a magazine roll 5 from which the cleaning cloth 4 is unrolled step by step;
A take-up roll 6 for winding and holding the cleaning cloth, a blade 8 for pressing the cleaning cloth against the impression cylinder, and a nozzle 12 provided in a cleaning liquid supply pipe 11 as a means for moistening near the cleaning cloth.
And a mountain-shaped support 7 having a guide portion 9 for holding the blade 8 and the cleaning liquid supply pipe 11 and holding the cleaning cloth on the side to be wound in contact with the impression cylinder surface; The claw mechanism mounting recess 1a of the impression cylinder 1 is provided with a claw shaft 2 and a claw 3 attached thereto. 2 is provided with a pawl escape cam 14. In addition, in order to prevent contact with the impression cylinder at least during high-speed rotation, the cleaning apparatus includes an air cylinder as a moving system for detaching the apparatus from the impression cylinder and a cleaning cloth that is moved step by step. And a one-way clutch and air cylinder for winding. The press-contact movement of the cleaning cloth 4 to the cylinder 1 by the blade 8 is performed by appropriate means. In the drawings, reference numeral 15 denotes a rotation support shaft for moving the frame 13 toward and away from the impression cylinder 1. Further, in order to prevent the cleaning cloth 4 from coming into contact with the impression cylinder claw 3, a mechanism may be employed in which the frame 13 is rotated around the support shaft 15 by a cam or the like instead of providing a claw relieving cam.

[Problems to be solved by the invention]

However, in the cleaning apparatus disclosed in Japanese Patent Application Laid-Open No. 63-92456, the impression cylinder is cleaned at the arcuate contact portion while pressing the cleaning cloth with a doctor. Adjusting to make uniform contact with the impression cylinder surface through the press is not only a difficult task because it requires mounting accuracy, but also when this device is mounted on the lower side of the impression cylinder, In addition, the task had to be difficult.

[Means for Solving the Problems] In the present invention, the blade that presses the cleaning cloth from the back surface to the impression cylinder side is elastically pressed so that the blade can slide on the support 7 toward the impression cylinder side. By providing the pressing mechanism, the blade 8 can surely bring the cleaning cloth 4 into uniform contact with the arc surface of the impression cylinder.

Further, a planar pressing member acting to press the cleaning cloth against the surface of the impression cylinder on the back side of the blade, that is, a pad, an air pad, a sponge roller, etc. In addition to the cleaning by the cleaning, the cleaning action using the surface contact of the cleaning cloth by the planar pressing member is also used.

[Action]

In the present invention, since the blade 8 is elastically pressed against the support 7 of the blade 8 by slidably moving the blade 8 toward the impression cylinder, the mounting accuracy of the blade 8 to the support 7 is improved. Even when the blade is not good, the blade 8 always comes into contact with the surface of the impression cylinder uniformly through the cleaning cloth 4, so that the mounting adjustment of the impression cylinder cleaning device to the impression cylinder becomes easy.

Further, the cleaning effect can be improved by pressing the cleaning cloth against the surface of the impression cylinder so that the cleaning cloth comes into surface contact with a planar pressing member such as a pad, an air pad, a sponge roller, or the like.

〔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 perspective view of the cleaning device.

The embodiment shown in FIG. 1 is different from the cleaning device shown in FIG. 3 in that the blade 8 is turned outward by a spring 17 in a groove of a U-shaped guide plate 16 provided on the surface of the blade 8 support 7. A pressing mechanism 18 slidably biased is provided.

That is, a U-shaped guide plate 16 is provided at one end of the mountain-shaped support 7, and the blade 8 is slidably moved by a coil spring 17 in the groove. The blade 8 is designed so as to uniformly contact the impression cylinder surface by expansion and contraction of the coil spring 17.
The cleaning cloth 4 is linearly pressure-bonded to the impression cylinder surface by the blade 8. Further, the other end of the mountain-shaped support 7 is used as a guide portion 9,
The cleaning cloth 4 contacts the impression cylinder 1 in an arc shape. The blade 8 and the guide 9 may be separately mounted on the frame 13 without using the mountain-shaped support.

In place of the spring 17, an air cylinder, an oil cylinder, an air pad, an oil pad, or the like may be used, and a pressing mechanism for forcibly pressing the blade so that a uniform force is applied over the entire width of the blade may be used. Further, in addition to pressing the cleaning cloth by the blade, a planar pressing member, for example, a felt pad 19 is provided on the back side of the blade, whereby the cleaning cloth 4 is pressed against the surface of the impression cylinder to strongly press the surface. The transferability to the cleaning cloth can be further improved.

〔The invention's effect〕

In the conventional apparatus, the pressing of the cleaning cloth to the impression cylinder is performed by a blade, and the impression cylinder of the offset sheet-fed printing press can be cleaned by combining with a nail escape mechanism. In addition, since it is necessary to maintain high contact accuracy between the blade tip and the impression cylinder surface, a great deal of labor, time, and introduction cost are required when introducing the cleaning device or replacing the blade. For this reason, as a method of automatically adjusting the contact accuracy between the blade and the impression cylinder surface, an optical or ultrasonic sensor is attached to several points at the tip of the blade assembled on the guide rail and the like, and the distance is adjusted. A method of measuring and applying feedback from the measured distance data to move the blade little by little is also conceivable, but such a device has to be complicated as an apparatus.

On the other hand, in the present invention, these problems were solved by providing the blade with the function of automatically adjusting the hitting accuracy of the blade itself, so that the introduction of the apparatus, maintenance, and the like can be easily performed.

This makes it possible to easily automate the cleaning of the impression cylinder, which had to be performed manually in the past, to save labor and improve productivity, and it is necessary to adjust the contact accuracy between the conventional blade and the impression cylinder. In such a case, it was practically impossible to attach a cleaning device to the lower side of the impression cylinder where there is no space, but as in the present invention, it was implemented by providing the blade itself with an automatic accuracy adjustment function. It became possible, and the constraints of the device were significantly reduced.

In addition to this, by providing a planar pressing member such as a felt pad on the back side of the blade, it is possible to make the cleaning cloth more strongly contact the surface of the impression cylinder with a felt pad in addition to the line contact with the blade. So you can
The cleaning effect can be improved.

[Brief description of the drawings]

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, FIG. 2 is a perspective view of the cleaning device, FIG. 3 is a side sectional view of a conventional example, and FIG. It is a sectional side view of a part. DESCRIPTION OF SYMBOLS 1 ... impression cylinder, 2 ... claw shaft, 3 ... claw, 4 ... cleaning cloth, 5 ... magazine roll, 6 ... take-up roll, 7 ... mountain-shaped support, 8 ... blade ... Guide part, 10 ... Arc contact part, 11 ... Cleaning liquid supply pipe, 12 ... Nozzle, 13 ... Frame body, 14 ... Claw escape cam, 15 ... Support shaft, 16 ... U-shaped guide Plate, 17 ... Coil spring, 18 ... Pressing mechanism, 19 ... Felt pad.

Claims (2)

(57) [Claims] 1. A cleaning cloth for cleaning an impression cylinder is moved step by step from a magazine roll to a take-up roll, and at the same time, the cleaning cloth is line-pressed to the impression cylinder by a blade from the back side while supplying a cleaning liquid. A mechanism for causing the cleaning cloth between the blade and the cleaning cloth guide portion to partially contact the impression cylinder in an arc shape and further preventing the cleaning cloth from coming into contact with a claw portion of the impression cylinder gripping a sheet. In sheet-fed printing press impression cylinder cleaning equipment,
An apparatus for cleaning an impression cylinder of an offset sheet-fed printing press, wherein the blade is attached via a pressing mechanism that elastically slidably presses the blade from the back side of the cleaning cloth toward the impression cylinder. 2. The offset sheet according to claim 1, wherein a planar pressing member that acts to further press the cleaning cloth in arc contact with the impression cylinder against the surface of the impression cylinder is disposed near the back surface of the blade. Leaf printing machine impression cylinder cleaning device.