JP2986138B2 - 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 substances may degrade the quality of the printed matter, and in order to maintain high quality, the printing cylinder surface is occasionally washed during preparation for printing operation 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. For this reason, cleaning methods such as a brush cleaning type, a nonwoven fabric wiping type and a cleaning head type have been adopted as conventional techniques. Among them, the cleaning head system has been disclosed by the present applicant in Japanese Patent Laid-Open No. 5-7741.
No. 2 has been published as an application, and further improvements have been made thereafter.
No. 21206 and Japanese Patent Application No. 5-54471.

[0003] The above-mentioned Japanese Patent Application No. 5-13381 is an invention having many advantages, and is extremely effective particularly when it is hardly soluble in a cleaning solution, for example, when UV ink is used. However, when used for ordinary inks and the like which are relatively soluble in the cleaning liquid, there is a problem that the exhaust amount is increased, the equipment cost is increased, the structure of the cleaning head is complicated, and the installation space is large.

Further, in order for the cleaning liquid to be uniformly distributed over the entire surface of the cleaning member, the interval between the supply pipes must be small, and the amount of the cleaning liquid needs to be reduced as much as possible due to cost considerations. In some cases, the supply pressure to the supply pipe is close to no pressure, and in this case, it is extremely difficult to make the amount of liquid injected from the supply pipe uniform over the entire surface. In order to avoid this, it is necessary to reduce the inner diameter of the supply pipe (for example, 0.2 mm or less).

[0005]

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, has a small displacement, and has a small facility cost. An object of the present invention is to provide a printing cylinder cleaning device for a printing device that requires less power consumption and is easy to maintain.

The present invention also provides a cleaning liquid supply means in which the cleaning liquid uniformly spreads over the entire surface of the cleaning member even when the supply pressure to the supply pipe is close to no pressure in the printing cylinder cleaning apparatus of the printing apparatus described in the preceding paragraph. Aim.

[0007]

SUMMARY OF THE INVENTION A printing cylinder cleaning apparatus of a printing apparatus according to the present invention rotates 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. In a cleaning device of a printing device that performs cleaning by pressing against the surface of the printing cylinder in the inside, a cleaning member for supplying and performing cleaning and a lip for scraping the cleaning waste liquid, a slit for discharging the cleaning waste liquid, and A washing head comprising a wind box, the washing head including a washing case and an air inlet, and the inside of the washing case is divided into a front part and a rear part with respect to the rotation direction of the printing cylinder, and the front part has A cleaning member is mounted, a lip is mounted on the rear portion, pressing 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 cleaning member on the front portion. A cleaning liquid supply means, and the air inlet means for introducing the air provided from the air inlet, between and below the rear portion of the said lip and said front are respectively formed the upper and lower slits leading to 該風 box.

Further, according to the present invention, the cleaning liquid supply means comprises a supply pipe composed of an elastic member having a circular cross section, and a small diameter nozzle hole is pierced at predetermined intervals to change the supply pressure of the cleaning liquid. Is to be adjusted.

[0009]

When the cleaning head of the cleaning device comes into contact with the printing cylinder, foreign matters such as ink, paper powder, dust, and powder adhered to the surface of the printing cylinder are introduced between the cleaning member mounted on the front of the cleaning case. . 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. Cleaning is first performed at the front of the cleaning case, and then the cleaning waste liquid containing foreign matters obtained by the cleaning is scraped off by the lip at the rear, and is sent from the intake port opened at the top of the cleaning case. The incoming air is sent to the wind box through the upper slit. On the other hand, a part of the cleaning waste liquid scraped off by the lip and remaining at the front edge of the notch of the printing cylinder, when the lip passes through the printing cylinder notch, due to the flow of air sent through the notch, It is sent to the wind box through the lower slit. Thus, the air and the washing waste liquid collected in the wind box are sucked and collected by the vacuum device, and the printing cylinder is sufficiently washed with the washing liquid in a short time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in a sheet-fed printing press will be described below with reference to FIGS.

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is an elevation view, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is an enlarged sectional view of the cleaning head portion of FIG. Show. In these figures, the printing cylinder cleaning device moves the cleaning head 3 which is arranged parallel to the central axis 2 of the printing cylinder 1 and which can be separated from and separated over the entire width of the printing cylinder 1 to the surface of the rotating printing cylinder 1. It is configured to perform cleaning by pressing against the surface.

Air cylinders 6 operated by compressed air are respectively mounted on brackets 5 fixed to the printing machine body frames 4 on both sides.
By operating the cleaning head 3 via the gusset 7, the cleaning head 3 can be moved toward and away 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 includes a cleaning case 9 having an air inlet 8 at an upper portion and a wind box 10. The inside of the cleaning case 9 is partitioned into a front part 11 and a rear part 12 in the rotation direction of the printing cylinder 1, and a cleaning member 13 formed of a sponge or the like is mounted or housed in the front part 11, and the rear part 12 is made of hard rubber. A lip 14 composed of such an elastic member is mounted. An upper slit 15 and a lower slit 16 each having an appropriate gap are formed between the lip 14 and the front part 11 and below the rear part 12, both of which penetrate the wind box 10. A lower lip 17 for preventing air from flowing in from below is attached to a lower portion of the lower slit 16 so as to be adjustable by a holding metal fitting or the like.

A cleaning liquid supply port 18 is provided in the upper part of the cleaning case 9. A cleaning liquid sent from a cleaning liquid supply device (not shown) is supplied to the cleaning member 13 from a supply nozzle 19 through the cleaning liquid supply port 18. Is done. Thus, foreign substances such as ink, paper powder, and powder that have adhered to the surface of the printing cylinder 1 and have been introduced into the cleaning head 3 are cleaned by the cleaning liquid.

The wind box 10 may have a structure in which the rear surface can be removed as a holding plate for convenience of maintenance. The air collected in the wind box 10 through the upper slit 15 and the lower slit 16 is discharged to the outlet 20 on one side.
It is sucked by a vacuum device (not shown).

Next, the operation will be described. During printing and in a state where printing is completed, the cleaning head 9 is in a state of being separated from the surface of the printing cylinder 1. 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, activate the vacuum device and the cleaning liquid supply device. 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 broken arrow in FIG. 4, and the waste liquid scraped off by the lip 14 is discharged. , Is pneumatically transported to the wind box 10 through the upper slit 15.

Referring to FIGS. 6, 7 and 8, a second embodiment of the cleaning liquid supply means will be described. In FIG.
1 includes a cleaning member 13, a sponge case 22 for accommodating the cleaning member 13, and the above-described cleaning liquid supply means. A cleaning liquid supply means and a supply pipe 23 having a circular cross section for supplying a cleaning liquid to the cleaning member 13 are provided.
And a fastener 25 for mounting the cleaning member 13. The supply pipe 23
Is formed of an elastic member such as rubber, and is provided with a large number of small-diameter (about 0.2 mm or less) nozzle holes 26 at predetermined intervals over the entire width of the printing cylinder 1 on the width direction side of the printing cylinder 1.
Are perforated in one or more rows. The supply pipe 23
Is held by the holding fitting 24, and the holding fitting 24
Is fixed to the sponge case 22 with bolts or the like. The end of the cleaning member 13 is
And secured by a fastening bolt 25 and a fastening fitting 25. A cleaning liquid supply port 18 is provided at one end of the supply pipe 23, and the cleaning liquid is supplied from a cleaning liquid supply unit (not shown).

Next, the operation of the second embodiment will be described. The cleaning liquid supplied from the cleaning liquid supply unit is introduced into the supply pipe 23 through the supply port 18. The supply pipe 23
Is expanded by the supply pressure of the cleaning liquid, whereby the nozzle hole 26 is also enlarged, and the cleaning liquid is sprayed. When the supply of the cleaning liquid is stopped, the pressure in the supply pipe 23 decreases, and the supply pipe 23 contracts to its original state, whereby the nozzle hole 26 also contracts, and the supply of the cleaning liquid stops.

In the second embodiment, when the supply of the cleaning liquid is stopped, the nozzle hole 26 is reduced, and the injection of the cleaning liquid is stopped. However, depending on the viscosity of the cleaning liquid and the supply pressure, the inlet of the supply pipe 23 may be closed. A stop valve may be provided. The supply of the cleaning liquid is preferably of an intermittent type, but may be of a continuous type. In addition, it is preferable that the nozzle hole 26 is formed in a state where an internal pressure is applied to the supply pipe 23 with compressed air or the like.

Next, the flow of air in the cleaning head 3 will be described with reference to FIGS. As shown in FIG. 4, when the lip 14 is in contact with the printing cylinder 1 and the cleaning operation is being performed, the flow of air flows from the portion a (the intake port 8) as indicated by the arrow indicated by the broken line in FIG. And the cleaning waste liquid is pneumatically transported to the wind box 10 through the upper slit 15.
On the other hand, since the flow of air from below the cleaning case 9 is blocked by the lower lip 17, there is almost no flow of air.

FIG. 5 shows a state in which the lip 14 passes through the notch 21 of the printing cylinder 1. a part (inlet)
4 is the same as that in FIG. 4, but when entering the position of the notch 21, the surrounding outside air flows from both ends of the notch 21 into the upper slit 15 and the lower slit 16 as arrows b. . Thus, most of the cleaning waste liquid scraped off by the lip 14 is pneumatically conveyed to the wind box 10 through the upper slit 14, and some of the cleaning waste liquid leaking from the tip of the lip 14 is also removed from the lower slit 16. The air is transported to the wind box 10 on the flow of the air generated inside. The cleaning waste liquid sucked from the inside of the wind box 10 by the above-described 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 3 from the printing cylinder 1. Then, the vacuum device is stopped, and the cleaning operation is completed.

Although the embodiment has been described with reference to a sheet-fed printing press, the present invention can be applied to a rotary printing press. In this case, it is desirable that the gap between the lower lip 17 and the surface of the printing cylinder 1 has a small gap instead of being fully closed. Although a sponge is used for the cleaning member 13, a brush may be used.

[0023]

According to the present invention, as compared with the conventional cleaning head type printing cylinder cleaning apparatus of a printing apparatus, it is structurally simple and does not require a large space, and the exhaust volume of the vacuum apparatus is small and the power consumption is small. And maintenance is easy. Therefore, it is suitable for application to a printing cylinder cleaning apparatus in which an installation space cannot be sufficiently obtained, and has an advantage that equipment costs can be reduced. Further, as compared with the conventional example, it is particularly effective for cleaning ordinary ink and the like which are easily dissolved in the cleaning liquid. Further, since the amount of the cleaning liquid remaining on the surface of the printing cylinder is small, it is advantageous for reducing waste paper and preventing paper breakage.

Also, in the present invention, the nozzle hole having a small diameter can be easily formed in a short time, the installation is easy, the cost is low, and the supply pressure of the cleaning liquid is increased because an elastic member is used for the supply pipe. The supply amount can be adjusted by changing. In addition, depending on the viscosity of the cleaning liquid and the supply pressure to the cleaning pipe, if the supply of the cleaning liquid is stopped, the injection of the cleaning liquid from the nozzle holes also stops, but this is particularly effective when the supply of the cleaning liquid is intermittent. It is.

[Brief description of the drawings]

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

FIG. 2 is an elevation view showing an embodiment of the printing cylinder cleaning device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

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

FIG. 5 is an explanatory diagram showing the flow of air when a lip passes through a notch of a printing cylinder.

FIG. 6 is a sectional view showing a cleaning liquid supply unit according to a second embodiment.

FIG. 7 is a diagram showing the left side by a BB section in FIG. 6 and the right side by a side view.

8 is a diagram showing the left side as viewed in the direction of arrows CC in FIG. 7, and the right side as a plane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Printing cylinder 2 ... Center axis 3 ... Cleaning head 4 ... Printing machine main body frame 5 ... Bracket 6 ... Air cylinder 7 ... Gusset 8 ... Intake port 9. ..Cleaning case 10 ・ ・ ・ Wind box 11 ・ ・ ・ Front 12 ・ ・ ・ Rear 13 ・ ・ ・ Cleaning member 14 ・ ・ ・ Lip 15 ・ ・ ・ Top slit 16 ・ ・ ・ Bottom slit 17 ・ ・ ・ Bottom lip 18 cleaning liquid supply port 19 supply nozzle 20 discharge port 21 notch 22 sponge case 23 supply pipe 24 holding metal fitting 25 fastening metal fitting 26 ... Nozzle hole 27 ... Tightening bolt

Continuation of the front page (56) References JP-A-5-77412 (JP, A) JP-A-51-217811 (JP, A) JP-A-6-226959 (JP, A) Japanese Patent Publication No. Sho 30-8543 (JP) , B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B41F 35/00-35/06

Claims (2)

(57) [Claims] 1. A printing apparatus for performing cleaning by pressing a cleaning head, which is arranged in parallel with a 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. The cleaning device includes 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, and the cleaning head includes a cleaning head. The cleaning case includes a case and an air inlet, and the inside of the cleaning case is divided into a front part and a rear part with respect to the rotation direction of the printing cylinder, the front part is provided with a cleaning member, and the rear part is provided with a lip. Pressing means for pressing the member against the surface of the printing cylinder together with the tip of the lip; cleaning liquid supply means for supplying a cleaning liquid to the front cleaning member; and air inflow means for flowing air from an air inlet. And an upper and lower slit communicating with the wind box are formed between the lip and the front part and below the rear part, respectively. 2. A cleaning liquid supply means comprising a supply pipe composed of an elastic member having a circular cross section, a small and small diameter nozzle hole is pierced at predetermined intervals, and the supply amount of the cleaning liquid is adjusted by changing the supply pressure of the cleaning liquid. The printing cylinder cleaning apparatus according to claim 1, wherein: