JPH0425336Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for cleaning cylinders in printing machines, and more specifically, the present invention relates to a device for cleaning cylinders in printing machines. The present invention relates to an improvement in a device for automatically cleaning the surface of a printing cylinder such as a printing cylinder.

[Prior art] When printing with an offset printing machine, dry ink and
Various foreign substances such as paper powder and dust may adhere.
Therefore, in order to maintain high printing quality, it is necessary to occasionally clean the surface of the brush cylinder during preparation for printing or during operation to remove attached foreign matter. Of course, once the printing operation is completed, the surface of the printing cylinder must be cleaned to completely remove the adhering ink.

As a device for cleaning the surface of such a printing cylinder, a cleaning device for printing cylinders has already been developed and used. A conventional cleaning device for a printing cylinder of this type is a cleaning device that is arranged parallel to the central axis of a printing cylinder such as a blank cylinder, and is movable in the tangential direction of the surface of the printing cylinder. It is known that it is equipped with a brush belt, a cleaning liquid injection device that sprays a cleaning solution into the brush belt, and a scraper device that brushs off the cleaning waste or foreign substance that adheres into the brush vert surface. The brush belt is usually an endless belt with bristles planted on the outer circumferential surface of the belt, and is driven to rotate along a tangent to the printing cylinder, and is supported so that it can move toward and away from the printing cylinder. be done.

When cleaning, a cleaning liquid is sprayed onto the surface of the brush belt, and the brush belt is brought into contact with the printing cylinder while rotating, thereby cleaning the surface of the printing cylinder. The spray time and number of sprays of the cleaning liquid are appropriately controlled depending on the degree of contamination, usage conditions, and the like. The printing cylinder surface is cleaned by the brush belt moistened with cleaning liquid rotating and coming into contact with the printing cylinder surface, and foreign matter such as ink and paper dust dissolved in the cleaning liquid is transferred from the printing cylinder to the brush belt. will be done.

A scraper device is provided to scrape off cleaning waste liquid, foreign matter, etc. transferred to the brush belt side in this manner. In the conventional technology, the scraper device is a so-called fixed type that is always installed slightly biting into the surface of the brush belt, and is configured to scrape off waste liquid, foreign matter, etc. adhering to the brush belt. It was hot.

[Problems to be Solved by the Invention] However, this configuration has the disadvantage that the cleaning liquid sprayed onto the brush belt is not efficiently transferred from the brush belt to the printing cylinder side. In other words, although a portion of the cleaning liquid sprayed onto the brush belt is transferred to the printing cylinder side, the remaining portion is immediately scraped off by the scraper device. In terms of quantity, it should be sufficient to spray the cleaning liquid two or three times for 2 to 3 seconds each, but since the cleaning liquid is not effectively transmitted to the printing cylinder side, the number of times the cleaning liquid is sprayed or the time taken is longer than necessary. There tended to be a lot of In other words, the amount of cleaning fluid used increases, resulting in a large economic loss, and the amount of waste fluid also increases, requiring waste fluid processing equipment with a large processing capacity, resulting in higher processing costs. be. Also,
When the scraper device digs deeper into the brush belt surface, it improves the efficiency of scraping off cleaning waste liquid, increases the amount of cleaning waste liquid, etc. transferred from the printing cylinder to the brush belt side, and allows the printing cylinder to dry quickly. If this is done, as mentioned above, the scraper device scrapes off the clean cleaning liquid that has not yet been transferred to the printing cylinder, so there is a conflicting problem in that the scraper device cannot penetrate deeply into the brush belt. It was happening.

In other words, the conventional technology had various drawbacks, such as not only the amount of cleaning liquid used and the amount of cleaning waste liquid also increasing, but also the time required for cleaning, which reduced the usage efficiency of the printing press. It is.

The purpose of the present invention is to eliminate the drawbacks of the prior art as described above, and to be able to clean the printing cylinder inexpensively and efficiently using the minimum necessary amount of cleaning fluid.
The amount of cleaning waste liquid is reduced, and waste liquid treatment equipment and processing costs are also reduced.In addition, in the cleaning process, cleaning liquid is efficiently transferred from the brush belt to the printing cylinder side, and from the printing cylinder to the brush belt side. An improved printing cylinder cleaning device that can combine these various effects to improve the usage efficiency of the printing press and operate the printing press extremely cheaply and efficiently as a total system. Our goal is to provide the following.

[Means for Solving the Problems] The present invention, which can achieve the above object, is a printing cylinder cleaning device in which the scraper device is particularly improved. The main feature is that the brush belt is not fixed, but has a movable structure that can move toward and away from the brush belt.

That is, the printing cylinder cleaning device according to the present invention serves as a scraper device for scraping cleaning waste liquid, foreign matter, etc. that bites into the brush belt surface and adheres to it, and is a scraper device that operates perpendicularly to the moving direction of the brush belt and in contact with the brush surface. A scraper body that is positioned to face each other and has a length comparable to the width of the brush belt, a support mechanism that supports the scraper body so that it can move toward and away from the brush belt, and a drive that drives the scraper body toward and away from the brush belt. The scraper body is configured to prevent the scraper body from digging into the surface of the brush belt at least during the period when the brush belt is in contact with the printing cylinder and the cleaning liquid is being sprayed onto the brush belt from the cleaning liquid spraying device. It constitutes a structure.

[Function] According to the present invention, during the cleaning process, the scraper body is in a non-contact state with the brush belt during the period when the brush belt is in contact with the printing cylinder and the cleaning liquid is sprayed from the cleaning liquid injection nozzle. Almost all of the cleaning liquid sprayed onto the brush belt is smoothly transferred to the printing cylinder, contributing to dissolving ink, removing paper dust, etc., and cleaning the surface. Since it is designed to bite into the surface of the brush belt during a period of time, it can dig deeply into the brush belt, thus efficiently removing cleaning waste liquid, paper dust, etc. transferred from the printing cylinder from the brush belt. It is possible.

[Example] Hereinafter, the present invention will be explained in more detail based on the drawings. FIG. 1 is an explanatory diagram showing an embodiment of a printing cylinder cleaning device according to the present invention. This printing cylinder cleaning device has an overall elongated structure and is arranged parallel to and close to the central axis of the printing cylinder 1. And inside it,
A brush belt 3 located parallel to the printing cylinder 1 and rotatably supported by two pulleys 2a and 2b so as to be movable in the tangential direction thereof, and a spray nozzle 4 for spraying cleaning liquid onto the brush belt 3.
and a scraper device 5 for scraping off cleaning waste liquid, foreign matter, etc. adhering to the brush belt.

The scraper device 5 is attached to an elongated support member 6 extending parallel to the brush belt 3 (see FIG. 3), and these devices are covered by a cover 7. The entire cleaning equipment is
The printing cylinder 1 is moved so that one side of the brush belt 3 can freely approach and separate from the surface of the printing cylinder 1.
The structure is mounted and driven so as to be movable in a direction.

The brush belt 3 has a structure in which numerous bristles 9 are implanted on the outer surface of the endless belt 8 which is rotatably supported by the two pulleys 2a and 2b as described above, and extends in the direction of the arrow (i.e. in the direction of the arrow in FIG. It can be rotated (counterclockwise).
The cleaning liquid spray nozzle 4 is installed above the brush belt 3 and can spray the cleaning liquid sent through the cleaning liquid supply pipe 10 toward the brush belt 3 as shown in FIG. It's becoming like that.

Now, the scraper device 5 is constructed as follows. Two hydraulic cylinders 11a11b are mounted on the opposite side of the support member 6, which is arranged parallel to the axial direction of the printing cylinder 1, and both scraper shafts are connected to the movable member 12 thereof. A scraper plate 14 is installed between the tips of the scraper plates 13, and four scraper bodies 15 are arranged in parallel on the inner surface of the scraper plate 14. Each scraper main body 15 has a blade shape with a protruding tip, and its length is approximately the same as the width of the brush belt 3. The bristles 9 are opposite to each other. A spring 17 is wound around the outer periphery of the piston 16 inside the hydraulic cylinders 11a, 11b, and the resiliency of the spring 17 constantly acts on the scraper shaft 13 in the protruding direction.

The operation of this device is as follows. First, the present invention is significantly different from the prior art in that the scraper device 5 is movable as described above, and the scraper body 15 is not in constant contact with the brush belt 3. Even at the beginning of the cleaning process, the scraper main body 15 is in a state separated from the brush belt 3. During cleaning, a cleaning liquid is sprayed from a spray nozzle 4 onto the surface of the rotating brush belt 3, so that the surface of the brush belt 3 is appropriately moistened with the cleaning liquid. In this state, the entire cleaning device is driven in the direction of the printing cylinder 1 (moves in the direction of the white arrow in FIG. 2), the surface of the brush belt 3 comes into contact with the surface of the printing cylinder 1, and cleaning is performed. At that stage, the cleaning liquid is further supplied to the brush belt 3 from the cleaning liquid spray nozzle 4 as required. Almost all of the cleaning liquid sprayed onto the brush belt 3 by this operation is transferred to the printing cylinder 1, dissolving the adhering ink, and removing foreign substances such as dissolved ink and paper dust. The waste liquid flows backwards from the printing cylinder 1 to the brush belt 3.
Move on to

At this time, the scraper body 15 is removed from the brush belt 3 without spraying the cleaning liquid from the spray nozzle 4.
It digs into the surface slightly. For that,
First, the hydraulic cylinders 11a and 11b are operated to remove their movable members 12 and the scraper shaft 1.
Pull 3. scraper shaft 13
is pulled in by the hydraulic pressure of the hydraulic cylinders 11a, 11b against the elastic force of the spring 17, and the force causes the scraper plate 14 to move inward in parallel, thereby being attached to its inner surface. The scraper body 15 bites into the tips of the bristles 9 on the surface of the brush belt 3 (third
(see figure). As a result, the cleaning waste liquid and foreign substances transferred to the brush belt 3 are scraped off, received by the waste liquid receiver 20, and flowed through there from the waste liquid nozzle to the waste liquid treatment equipment side (not shown). be discharged. During the period when the scraper main body 15 is biting into the tip of the bristles 9 of the brush belt 3, the cleaning liquid is not sprayed from the cleaning liquid injection nozzle 4, so that the cleaning liquid can be bitten quite deeply, thereby efficiently transferring it to the brush belt 3. It is possible to remove cleaning waste liquid etc.
Furthermore, if cleaning is incomplete at this stage,
The scraper main body 15 is separated from the brush belt 3, and the cleaning liquid is sprayed onto the brush belt 3 again to clean it. In order to separate the scraper body 15 from the brush belt 3, hydraulic cylinders 11a and 11 are used.
It is sufficient to release the hydraulic pressure applied to b. Then, the movable member 12 is pushed out by the elastic force of the spring 17, and the scraper shaft 13
The scraper plate 1 is retracted so that the scraper body 15 is separated from the brush belt 3.
This is because 4 moves in parallel.

In this way, the printing cylinder 1 is cleaned. Once the printing cylinder 1 has been completely cleaned,
The entire cleaning device moves backward (in the direction of the outlined arrow in FIG. 4), and cleaning of the printing cylinder 1 itself is completed. If the brush belt 3 is dirty at this time, the cleaning liquid is sprayed from the cleaning liquid injection nozzle 4 to moisten the surface, and at the same time or after that, the scraper main body 15 is driven to bring the brush belt 3 into contact and remove the adhered liquid. All you have to do is remove any foreign objects, etc.

[Other Possible Embodiments] Although a preferred embodiment of the present invention has been described in detail above, it goes without saying that the present invention is not limited to this configuration, and the shape of the scraper body, its support mechanism, etc. may be modified as appropriate. Needless to say, it can be changed. In the above embodiment, the scraper main body can move toward and away from the brush belt by a reciprocating mechanism, but it may also be configured to move toward and away from the brush belt by using, for example, a swinging mechanism or a rotating mechanism such as a link. You can also do it. In addition, the driving source may be not only a hydraulic cylinder but also an air cylinder, etc.
In some cases, it may be possible to move it by electrical methods such as electromagnetic solenoids or motors.
Note that the period in which the scraper body is not in contact with the brush belt is the period in which the brush belt is in contact with the printing cylinder as described above and the cleaning liquid is not sprayed onto the brush belt from the cleaning liquid injection device, and at least any of the above As long as one or the other is not applicable, contact may be made.

[Effects of the invention] Since the present invention is a printing cylinder cleaning device configured as described above, the scraper body does not dig into the brush belt all the time, but can dig into the brush belt only when necessary. The new cleaning liquid deposited on the brush belt is efficiently and smoothly transferred to the printing cylinder, and as a result, the amount of cleaning liquid sprayed onto the brush belt can be kept to the minimum necessary, which can significantly reduce the amount of cleaning liquid consumed. As a result, the amount of cleaning waste liquid generated is reduced, making it possible to significantly reduce waste liquid processing equipment and processing costs.Also, since the scraper body can be deeply inserted into the brush belt, the brush belt can be accessed from the printing cylinder side. This greatly increases the amount of cleaning waste liquid and foreign matter transferred to the side, which helps in accelerating the drying of the printing cylinder, making it possible to construct a system that is extremely inexpensive overall, and greatly improving the efficiency of printing press usage. It can produce excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the cleaning device according to the present invention, and FIGS. 2, 3, and 4 are explanatory views showing its operation, respectively. 1... Printing cylinder, 3... Brush belt, 4
...Washing liquid injection nozzle, 5...Scraper device, 11a, 11b...Hydraulic cylinder, 13...
Scraper shaft, 14...Scraper plate, 15...Scraper body, 17
……spring.

Claims (1)

[Scope of utility model registration request] A brush belt that is arranged parallel to the printing cylinder and can move toward and away from the printing cylinder in a tangential direction thereof; a cleaning liquid spraying device that sprays cleaning liquid onto the brush belt; and a cleaning liquid injection device that bites into the surface of the brush belt and adheres to it. In the cleaning device for printing cylinders, the scraper device is located perpendicularly to the direction of movement of the brush belt and opposite to the brush surface of the brush belt. It consists of a scraper body having a length comparable to the width of the brush belt, a support mechanism that supports the scraper body so that it can move toward and away from the brush belt, and a drive mechanism that drives the scraper body toward and away from the brush belt. A cleaning device for a printing cylinder in which a scraper main body is prevented from biting into the brush belt during a period when the brush belt is in contact with the printing cylinder and cleaning liquid is being sprayed onto the brush belt from the cleaning liquid spraying device.