JP2904465B2 - Printing cylinder cleaning device - Google Patents

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 various printing cylinders such as a blanket cylinder and an impression cylinder of an offset printing press.

[0002]

2. Description of the Related Art When printing with an offset printing machine,
Foreign matter such as ink, paper powder, powder, and dust may adhere to the surface of the printing cylinder. Such foreign matter may degrade the quality of the printed matter, and in order to maintain high print quality, the printing cylinder surface is occasionally washed during preparation for printing work or during operation, and the above-described surface adhering to the surface is removed. Foreign matter must be removed. After the printing operation is completed, the surface of the printing cylinder must be completely cleaned in order to completely remove the attached ink.

[0003] The prior art will be described by taking as an example the cleaning of a blanket cylinder, one of the printing cylinders. As a conventional apparatus for cleaning a blanket surface, for example, Japanese Utility Model Application Laid-open No.
There is one shown in JP-A-8943. According to this technology,
A bristle-implanted brush belt which is disposed parallel to the central axis of the blanket cylinder and is detachable from the surface of the blanket cylinder, and is movable in the tangential direction thereof; and a cleaning liquid for supplying a cleaning liquid to the brush belt. The apparatus includes an injection device and a scraper device that bites into bristles on the surface of the brush belt and scrapes off cleaning waste liquid and foreign matter attached thereto.

[0004] However, in this prior art, since bristles are implanted in the brush belt, the liquid retention of the cleaning liquid is poor.
Therefore, there is a problem that a large amount of the cleaning liquid is consumed. Also, the bristles are damaged because the scraper is pressed against the bristles of the brush belt.

Furthermore, in order to obtain a sufficient cleaning effect, it is necessary to strongly press the brush belt against the blanket cylinder, and a force for pushing the brush belt in the width direction acts upon contact with the rotating blanket cylinder. In addition, it becomes sturdy, and the driving power also increases. As a result, when the space near the blanket cylinder is narrow, it is difficult to dispose the blanket cylinder, and there is a problem that it is not preferable for performing maintenance work.

As another prior art, Japanese Patent Publication No. 2-66
No. 29 discloses a nonwoven fabric supply roll and a take-up roll, and a blanket cylinder is provided between the supply roll and the take-up roll via an expansion member in which the nonwoven fabric wetted with a cleaning liquid is expanded by compressed air. A device for contacting over the entire length of the device and wiping foreign matter or the like is shown. According to this technique, the consumption of the cleaning liquid is small.

However, when the pressure pad passes through the gap portion of the blanket cylinder, there is a problem that foreign matter adhering to the nonwoven fabric may be pushed into the gap and deteriorate printing performance. For this reason, after the cleaning of the blanket cylinder is completed, it is necessary to stop the rotation of the blanket cylinder and manually wipe off the foreign substances adhering with a cloth or the like. Further, it is necessary to strongly press the nonwoven fabric against the blanket cylinder in order to improve the cleaning effect. For this reason, an accident of cutting the nonwoven fabric may occur. In this case, there is a problem that the broken end of the nonwoven fabric is caught in the rotating direction of the rotating blanket cylinder, causing a large accident. Further, since the nonwoven fabric is discarded as a consumer good after the wiping, the cost for the nonwoven fabric increases. In addition to this, since a large space is taken up structurally, it is difficult to dispose it in an allowed narrow space, which is not preferable in terms of maintenance.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and is structurally simple, does not require a large space, consumes less power, and has a long cleaning time. Is short, consumes a small amount of cleaning liquid, does not require expensive consumables such as nonwoven fabric, does not require foreign substances to be pushed into the gap of the blanket cylinder, has good cleaning liquid retention properties, is easy to operate, and has low maintenance. An object of the present invention is to provide an easy cylinder cleaning device for a printing apparatus.

[0009]

According to the present invention, a cleaning head, which is arranged parallel to the central axis of a printing cylinder and is detachable over the entire width of the printing cylinder, can rotate the printing cylinder. In a cleaning device of a printing device that performs cleaning by pressing against the surface of a printer, a cleaning member for supplying and cleaning the cleaning liquid, a lip for scraping the cleaning waste liquid, a slit for discharging the cleaning waste liquid, and a wind box. Comprising a cleaning head, wherein the wind box has an inner bottom surface inclined in the direction of the flow of the cleaning waste liquid, and a discharge port for the cleaning waste liquid is provided at a lower portion of the end thereof.
An air outlet is provided at the front of the terminal.

According to the present invention, a cleaning head which is arranged in parallel with the central axis of the printing cylinder and which can be separated from and separated over the entire width of the printing cylinder is pressed against the surface of the rotating printing cylinder. In a cleaning apparatus of a printing apparatus for performing cleaning, the cleaning head includes a cleaning case, an air inlet, and a wind box, and the cleaning case partitions an inside into a front part, a rear part, and an intermediate part in a rotation direction of a printing cylinder. A cleaning member mounted on each of the front and rear portions, a lip mounted on an intermediate portion, means for pressing the cleaning member together with the tip of the lip against a printing cylinder surface, and a cleaning device for cleaning the front and rear portions; A cleaning liquid supply means for supplying a cleaning liquid to the member, and a means for introducing air from the suction port and the lower part of the cleaning case are provided, and an upper part communicating with the wind box is provided between the lip and the front part and below the rear part. Passing It is formed with the lower slit.

[0011]

[0012]

When the cleaning head of the cleaning device comes into contact with the printing cylinder, foreign substances such as ink, paper powder, dust, and powder adhered to the surface of the printing cylinder are introduced between the cleaning member attached to the front and rear of the cleaning case. Is done. On the other hand, a cleaning liquid is supplied to the cleaning member from a cleaning liquid supply device, and the cleaning is performed here. In the cleaning, first, preliminary cleaning is performed at the front of the cleaning case. By this washing, the washing waste liquid containing most of the foreign matter is scraped off by the lip, and is sent to the wind box through the upper slit by the inflow air sent from the air inlet opened at the upper part of the washing case. Next, the cleaning waste liquid containing foreign matter that has not been scraped off by the lip is sent to the rear, and the final cleaning is performed by supplying new cleaning liquid.
The washing waste liquid is sent to the wind box through the lower slit by the inflow air sent from the gap between the lower portion of the washing case and the printing cylinder. The air and the washing waste liquid collected in the wind box are sucked and collected by a vacuum device. The printing cylinder is thus thoroughly cleaned in a short time by the cleaning liquid.

[0013]

An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1, 2, 3 and 4,
A cleaning head 3 arranged parallel to the central axis 2 of the printing cylinder 1 and capable of coming and going over the entire width of the printing cylinder 1 is pressed against the surface of the rotating printing cylinder 1 to perform cleaning. ing.

Air cylinders 6 operated by compressed air are respectively mounted on brackets 5 fixed to the printing machine body frames 4 on both sides, and the air cylinders 6 operate the cleaning head 3 via gussets 7. Thereby, it is possible to contact and separate from the surface of the printing cylinder 1. The contact pressure on the surface of the printing cylinder 1 can be appropriately adjusted by an adjusting device (not shown). The cleaning head 3 is
It comprises a washing case 9 having an intake port 8 at the top and a wind box 10. The inside of the cleaning case 9 is partitioned into a front part 11, a rear part 12 and an intermediate part 13 in the rotation direction of the printing cylinder 1, and the front part 11 and the rear part 12 are provided with cleaning members 14, 15 each composed of a sponge. A lip 16 that is housed and is made of an elastic member such as rubber is attached to the intermediate portion 13. When the entire width of the cleaning case 9 is long, the lip 16 may be provided with an adjusting mechanism for uniformly applying the tip of the lip 16 to the surface of the printing cylinder. Slits 17 and 18 having appropriate gaps are respectively formed between the lip 16 and the front part 11 and below the rear part 12, and both slits penetrate the wind box 10.

A cleaning liquid supply port 19 is provided at an upper portion of the cleaning case 9. The cleaning liquid sent from a cleaning liquid supply device (not shown) is supplied to cleaning members 14 and 15 via supply pipes 20 and 21, respectively. . Thus, printing cylinder 1
Foreign substances such as ink, paper powder, and powder that have adhered to the surface and are introduced into the cleaning head 3 are cleaned by the cleaning liquid.

The wind box 10 has a structure in which both side surfaces are removable as blind plates 22 so as to be convenient for maintenance. The air collected in the wind box 10 through the slits 17 and 18 is sucked by a not-shown vacuum device from an outlet 23 at the center front. If the width of the cleaning head 3 is short, a discharge port 23 may be provided on one of the cleaning heads 3. The one-sided flow of the air from the slits 17 and 18 in the width direction worsens the discharge of the cleaning waste liquid, leading to a reduction in the cleaning effect. The one-sided flow increases as the width of the cleaning head 3 increases, but also depends on the flow rate of the air in the wind box 10. For this reason, the cross-sectional area of the wind box 10 is selected so as to suppress this flow rate so as not to affect the cleaning effect.

Further, the bottom inclined plate 2 inside the wind box 10
5 is inclined from both sides toward the center bottom, and the washing waste liquid collected in the wind box 10 through the slits 17 and 18 is blown off by air in addition to gravity lowering, and It is collected at the outlet 24 and is sucked together with air by the above-mentioned vacuum device (not shown).

Next, the operation will be described. During printing and after printing, the cleaning head 9 is attached to the printing cylinder 1.
In a state separated from the surface. In the cleaning operation, first, the printing cylinder 1 is rotated, the air cylinder 6 is extended, and the cleaning head 9 is brought into contact with the printing cylinder 1. At the same time, the vacuum device and the cleaning liquid supply device are operated. Thus, the supply of the cleaning liquid and the processing of the cleaning waste liquid are performed. Here, in the cleaning, the cleaning liquid and water may be supplied in an emulsion state, or the cleaning liquid and water may be supplied alternately. When the cleaning operation is started and the above-described vacuum device is operated, the outside air is sucked from the intake port 8 on the upper part of the cleaning case 9 as shown by the dashed arrow in FIG. , Is pneumatically transported to the wind box 10 through the slit 17. On the other hand, the outside air is also sucked from below the cleaning case 9 as shown by the dashed arrow in FIG. 4, and the cleaning waste liquid that has been cleaned in the rear part 12 is pneumatically transported to the wind box 10 through the slit 18. The waste liquid sucked by the vacuum device is collected by a waste liquid collecting device (not shown).

When the surface of the printing cylinder 1 becomes clean after an appropriate time, only the supply of the cleaning liquid is stopped, and the vacuum device is operated as it is to wipe off the remaining cleaning liquid sufficiently. Thereafter, the air cylinder 6 is operated to release the cleaning head 9 from the printing cylinder 1. Then, the vacuum device is stopped, and the cleaning operation is completed.

In the embodiment, a sponge is used for the cleaning members 14 and 15, but a brush may be used.

[0022]

The present invention is structurally simpler than a conventional printing cylinder cleaning apparatus, has few moving parts in the main body, does not require complicated control, is easy to operate, and requires less maintenance work. Is easy. Also, there is no need for expensive consumables such as non-woven fabric, and no large space is required.
There is an advantage that less driving power is required. Furthermore, by adopting the air inlet, a substantially constant amount of air flow can always be secured in the upper slit, even when the cleaning head passes through the gap of the printing cylinder, and the cleaning waste liquid in the gap is removed. The rest can be eliminated. In addition, the internal structure of the wind box can be modified to reduce variations in the wind speed in the width direction, and the washing case is divided into an upper part, a lower part, and an intermediate part, thereby performing two-stage cleaning of preliminary cleaning and finishing cleaning. Thereby, improvement in the cleaning effect and a significant reduction in the cleaning time can be expected.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a printing cylinder cleaning device.

FIG. 2 is a plan view showing the embodiment of FIG.

FIG. 3 is an enlarged view of an AA cross section of FIG. 1;

FIG. 4 is an enlarged sectional view of the cleaning head of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing cylinder 2 Central axis 3 Cleaning head 4 Printer body frame 5 Bracket 6 Air cylinder 7 Gusset 8 Inlet 9 Cleaning case 10 Wind box 11 Front part 12 Rear part 13 Intermediate part 14 Cleaning member 15 Cleaning member 16 Lip 17 Slit 18 Slit 19 cleaning liquid supply port 20 supply pipe 21 supply pipe 22 blind plate 23 discharge port 24 discharge port 25 bottom inclined plate

Claims (2)

(57) [Claims] 1. A printing apparatus for performing cleaning by pressing a cleaning head disposed parallel to a central axis of a printing cylinder and capable of coming and going over the entire width of the printing cylinder against the surface of the rotating printing cylinder. A cleaning device for supplying and cleaning a cleaning liquid, a lip for scraping the cleaning waste liquid, a slit for discharging the cleaning waste liquid, and a wind box; The printing device is characterized in that the inner bottom surface of the box is inclined in the direction of the flow of the cleaning waste liquid, a discharge port for the cleaning waste liquid is provided at the lower end of the box, and an air outlet is provided at the front of the terminal. Cylinder cleaning device. 2. A printing apparatus for performing cleaning by pressing a cleaning head, which is arranged in parallel with the central axis of a printing cylinder and is capable of coming and going over the entire width of the printing cylinder, against the surface of the rotating printing cylinder. In the cleaning apparatus, the cleaning head includes a cleaning case, an air inlet, and a wind box, and the cleaning case is internally partitioned into a front part, a rear part, and an intermediate part with respect to a rotation direction of a printing cylinder. A cleaning member is attached to each of the rear and rear parts, a lip is attached to the middle part, a means for pressing the cleaning member together with the tip of the lip against the surface of the printing cylinder, and a cleaning liquid is supplied to the front and rear cleaning members. Cleaning liquid supply means, and a means for introducing air from the suction port and the lower part of the cleaning case are provided, and upper and lower slits are formed between the lip and the front part and below the rear part to communicate with the wind box, respectively. A printing cylinder cleaning device for a printing device, comprising: