JPS63188050A - Device for removing paper powder on blanket cylinder of printing press - Google Patents

Abstract

PURPOSE:To automatically remove paper powder accumulated on a printing press blanket cylinder, by a method wherein a cleaning liquid, such as water, is directly jetted on the printing press blanket cylinder, and a cloth, brush, or roller is pressed against the surface of the blanket cylinder. CONSTITUTION:In the cleaning of a printing press blanket cylinder by using water as a cleaning liquid, the water is directly jetted onto the surface of the blanket cylinder out of jet nozzles 9 and, simultaneously, paper powder accumulated on the surface of the blanket cylinder is made to adhere to a cloth 15 which is pressed against the blanket cylinder by a cloth presser 8, whereby the powder is removed from the blanket cylinder and the water is also wiped off. A water jet device 7 consists of two or more nozzles, horizontally arranged in the width direction of the printing press blanket cylinder, and a pipe arrangement therefor. The cloth presser 8 consists of the cloth 15, a cloth pressing mechanism pressing the cloth against the printing press blanket cylinder by a cloth pressing roller 14 etc. by the aid of an air cylinder 13, and a cloth feeding mechanism which feeds the cloth from a new cloth take-up roll 16 to an old cloth take-up roll 17, for example, by actuating a motor for a fixed period of time just when the cloth pressing roller 14 is separated from the blanket cylinder. The automatic removing can completely eliminate a manual operation preformed by operators, which has conventionally taken more than 10 minutes, and realize a shorter interruption of printing time, a higher productivity, and a reduced labor of operators.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention provides a device for automatically removing paper dust attached to the blanket cylinder of an offset printing machine! It is related to.

[Prior Art] As a conventional device for cleaning the blanket cylinder of an offset printing machine, there is a device that presses a brush, roller, or cloth against the blanket cylinder surface to remove ink, paper dust, etc. adhering to the blanket cylinder surface.

Brush-type devices operate by rotating a roll or belt-shaped brush impregnated with cleaning liquid and rubbing it against the printing press blanket cylinder. Roller-type devices operate by rubbing one or more rubber rollers impregnated with a cleaning liquid against the printing press blanket cylinder.

Further, cloth type devices operate by rubbing a cleaning cloth impregnated with a cleaning liquid against the blanket cylinder of the printing press.

[Problems to be Solved by the Invention] However, the cleaning devices according to the above-mentioned prior art are mainly intended for cleaning ink adhering to the blanket cylinder of a printing press, and cannot remove paper powder adhering to the blanket cylinder. could not.

Therefore, workers manually remove the paper dust accumulated on the rubber cylinder of the printing press using cleaning liquid, cloth, and a metal spatula every time the printing item changes. During this work, printing was interrupted for more than 10 minutes, and this work was hard work that placed a burden on the operator.

[Means for Solving the Problems] The present invention was invented as a result of research to solve the above problems, and it sprays cleaning liquid such as water directly onto the blanket cylinder of the printing press, and at the same time sprays cleaning liquid such as water onto the blanket cylinder of the printing press. Alternatively, the above-mentioned problem has been solved by a method in which a sliding member such as a roller is pressed against the rubber cylinder using a device. That is, the paper dust removal device for a printing press blanket cylinder of the present invention includes a cleaning liquid injection device that directly sprays cleaning liquid in the form of fine particles onto the blanket cylinder surface of an offset printing press;
The rubbing body pressing method involves pressing a rubbing body such as a cloth, a brush, or a roller against the blanket cylinder to scrub away paper powder, etc. that has adhered to the blanket cylinder surface, and to wipe off the cleaning liquid sprayed on the blanket cylinder surface. It is characterized by consisting of a device.

[Function] The present invention sprays a cleaning liquid such as water directly onto the printing press blanket cylinder,
By pressing a cloth, brush, or roller against the blanket cylinder surface, it is possible to automatically remove paper dust accumulated on the blanket cylinder of the printing machine, and spraying more cleaning liquid onto the blanket cylinder than necessary may affect printing or print quality. to cause problems,
When spraying printing blanket cylinder cleaning liquid, avoid printing by avoiding the blanket cylinder gap, or by recognizing the paper dust position on the blanket cylinder by inputting the paper size and making the spraying position of cleaning liquid variable. This makes it possible to automatically remove paper dust accumulated on the machine blanket cylinder, greatly reducing printing interference time, and at the same time reducing the labor of the printing operator.

[Example] The present invention will be explained below based on examples.

Fig. 1 shows an offset sheet-fed printing press. In the figure, 1 is a paper feed section, and printing paper is transferred from the paper feed section 1 to printing units 2a and 2.
The sheets are fed one by one through the paper paths b, 2c, and 2d, and are ejected at the paper ejecting section 3. Each printing unit includes a plate cylinder 4, a blanket cylinder 5, an impression cylinder 6, an inking device (not shown), a dampening water device, etc.

The present invention relates to a blanket cylinder 5 of a printing press, and as shown in FIG. It is. The cleaning liquid is supplied from the cleaning liquid tank 11 to the injection nozzle 9 via the valve 10.

In this embodiment, a case where water is used as the cleaning liquid will be described below. To clean the blanket cylinder of the printing press, water is directly injected from the spray nozzle 9 onto the blanket cylinder surface, and at the same time, the cloth pressing device 8 attaches paper dust that has accumulated on the blanket cylinder surface to the cloth 15 pressed against the blanket cylinder. This is accomplished by removing paper dust from the rubber cylinder and wiping off water as well.

Further, by using not only water but also an ink solvent as the cleaning liquid to be sprayed, it is possible to remove both paper dust and ink at the same time.

Further, in this embodiment, a case is described in which cloth is used as the object to be pressed against the rubber cylinder, that is, the rubbing body, but a brush or a roller may be used instead of cloth.

According to this embodiment, the water injection device 7 is composed of a plurality of nozzles arranged horizontally in the width direction of the blanket cylinder of the printing press and piping thereof. Further, as shown in FIG. 3, the device 8 for pressing the cloth uses a cloth 15 and an air cylinder 13 to press the cloth against the blanket cylinder of the printing press using a roller 14 or the like. At the moment when the pressing roller 14 is separated from the blanket cylinder, that is, by the air cylinder, the pressing is constant until the roller is separated from the blanket cylinder and pressed against the blanket cylinder again, or while the roller is in the blanket cylinder gap area. It is constituted by a cloth feeding mechanism that feeds the cloth from the new cloth winding roll 16 to the old cloth winding roll 17 by operating a timer motor or the like.

Another embodiment of the present invention is such that the water injection device of the above embodiment is equipped with a movable injection nozzle 25 that is movable in the width direction with respect to the blanket cylinder of the printing press.

In this embodiment, as shown in FIG. 4, if the dimensions of the printing paper are input in advance through the input unit 22 before cleaning, the control unit 21 performs calculations to determine the movable range, and during cleaning, the movable jet nozzle 25 is Water is injected within a predetermined range by controlling the valve lO while appropriately moving along a guide rod 19 in the width direction of the barrel 5 by a motor 18 and a feed screw 20. The reason why such a jetting method is used is that it is known from experience that paper dust is deposited at the position where the end of the sheet hits the blanket cylinder. By doing so, the number of water injections to unnecessary areas can be minimized, and the number of injection nozzles can be reduced to 1 or 2.
This makes it possible to spray water over the entire width of the rubber cylinder.

By reducing the amount of water to be ejected in this manner, it is possible to prevent deterioration in printing quality, paper curling, etc. caused by water remaining on the blanket cylinder.

Furthermore, in another embodiment shown in FIG.
The device is capable of spraying water only on areas where paper dust has accumulated.

According to this embodiment, by inputting the printing paper dimensions in advance in the input section 22 before cleaning, the control section 21 selects the nozzles to be activated and sprays water within the range to be sprayed during cleaning. It is possible to activate only the nozzle. Furthermore, the opening/closing of the valve 10 is controlled by inputting signals from the printing machine rotating shaft to the control unit 21 using the encoder 23 or the like to avoid spraying water into the gap portion of the blanket cylinder 5, and to avoid spraying paper on the surface of the blanket cylinder. It is also possible to spray water only on the paper dust that has accumulated in the area where the end touches and the area around that area.

For example, if the paper dust 24 is accumulated as shown in FIG. 6, the nozzles 9a and 9f will not spray water, and the nozzles 9b and
The nozzle 9e sprays water from the edge of the paper to the part corresponding to the butt end, and the nozzles 9c and 9d spray water only to the part corresponding to the butt end of the paper. This is because it is known from experience that the areas where paper dust accumulates are mainly limited to the area where the edge of the paper comes into contact with the blanket cylinder.

According to this embodiment, cleaning is performed efficiently, the amount of water sprayed is kept to the minimum necessary, and elements that interfere with printing can be significantly reduced. Another embodiment shown in FIG. 7 is a conventional blanket cylinder cleaning device that cleans the blanket cylinder of a printing press by pressing a cloth, brush, or roller impregnated with cleaning liquid into the blanket cylinder cleaning device described in the previous embodiment. It is equipped with a water injection device.

In this embodiment, while cleaning ink adhering to the blanket cylinder with a conventional blanket cylinder cleaning device, a cleaning liquid such as water is injected from the jet nozzle to remove paper dust, and the conventional blanket cylinder cleaning device along with the ink using a cloth pressed against the
This makes it possible to completely remove paper dust.

This method is advantageous in terms of space and cost because both ink and paper powder can be removed by simply attaching the water jet device 7 equipped with the water jet nozzle 9 to the conventional blanket cylinder cleaning device 26. .

Although the four embodiments have been described above, the cleaning liquid spray nozzle and cloth pressing device provided on the outer periphery of the blanket cylinder or the conventional blanket cylinder cleaning device may be located anywhere on the blanket cylinder. In the drawings of this embodiment, the spray nozzle and cloth pressing device are separated, but they may be integrated.In that case, based on experience,
It is better to arrange a spray nozzle on the upstream side of the rotation of the blanket cylinder and a cloth pressing device on the downstream side to spray water onto the paper dust on the circumferential surface of the blanket cylinder and then rub the cloth against it.

[Effects of the Invention] Since the present invention is configured as described above, by using the present invention, it is possible to automatically remove paper dust accumulated on the rubber cylinder of a printing press, which takes more than 10 minutes in the past. It completely eliminates the manual work of the operator, reduces printing interruption time, improves productivity, and reduces the labor of the operator.

In addition, if the injection nozzle is moved during cleaning, or if the piping for multiple injection nozzles is separated and the opening and closing of the valves of each piping is controlled using signals from the printing press rotation shaft, it is possible to It is possible to minimize the amount of water sprayed on the printer, allowing efficient cleaning and preventing deterioration in print quality such as water dripping and printing problems such as paper wrapping.

Furthermore, when attaching a water jet device to a conventional blanket cylinder cleaning device that presses cloth, brushes, or rollers against the blanket cylinder, simply attaching the water jet device makes it possible to remove both paper dust and ink, and it takes up less space. It is extremely effective both in terms of performance and cost.

[Brief explanation of the drawing]

Figure 1 is an explanatory side view showing an offset sheet-fed printing press, Figure 2 is an explanatory side view showing an offset sheet-fed printing press;
The figure is a perspective view showing a basic embodiment of the present invention, FIG. 3 is a perspective view showing an example of a means for pressing cloth onto a blanket cylinder, and FIG. 4 is a perspective view showing an example of a means for pressing cloth onto a blanket cylinder. FIG. 5 is an explanatory perspective view showing an embodiment including a plurality of injection nozzles with individual piping in the width direction of the blanket cylinder, and FIG. 6 is an explanatory perspective view showing the operation of the plurality of injection nozzles. An explanatory diagram of the situation, FIG. 7 is a perspective view showing an embodiment in which a water injection device is attached to a conventional rubber cylinder cleaning device. 1... Paper feeding section, 2a, 2b, 2c, 2d... Printing unit, 3... Paper discharge section, 4... Plate cylinder, 5...
... Rubber cylinder, 6 ... Impression cylinder, 7 ... Cleaning liquid injection device, 8 ... Cloth pressing device, 9.9a~9
f...Injection nozzle, lO...Valve, 11...
Cleaning liquid tank, 12... Piping, 13... Air cylinder, 14... Roller for pressing cloth, 15... Cloth, 16... New take-up roll, 17...
・Heavy cloth take-up roll, 18...Motor, 19...
・Guide rod, 20...Feed screw, 21・
...control section, 22...input section, 23
... Encoder, 24 ... Paper powder, 25.
...Movable injection nozzle, 26...Rubber cylinder cleaning device.

Claims (5)

[Claims] (1) A cleaning liquid spraying device that sprays fine particles of cleaning liquid directly onto the blanket cylinder surface of an offset printing machine, and a cleaning liquid spraying device that scrapes off paper powder etc. adhering to the blanket cylinder surface and removes the adhesion, and A device for removing paper dust from a rubber cylinder of a printing press, comprising a cloth for wiping off cleaning liquid, and a rubbing body pressing device for pressing a rubbing body such as a brush or a roller against the blanket cylinder. (2) Claims characterized in that the cleaning liquid injection device has an injection nozzle that is movable in the width direction of the blanket cylinder so that the cleaning liquid injection position can be varied depending on the position of paper dust to be removed. 2. A device for removing paper dust from a rubber cylinder of a printing press according to item 1. (3) The cleaning liquid injection device is equipped with a plurality of injection nozzles that are fixed so that the cleaning liquid can be sprayed over the entire width of the blanket cylinder, and each injection nozzle is equipped with a plurality of injection nozzles that are fixed so that the cleaning liquid can be sprayed over the entire width of the blanket cylinder. 2. A paper powder removing device for a blanket cylinder of a printing press according to claim 1, wherein the piping is provided with a controllable valve. (4) Printing according to claim 1, characterized in that the sliding member pressing device is a blanket cylinder cleaning device of a type that presses a cloth, a brush, or a roller impregnated with a cleaning liquid onto the printing machine blanket cylinder. Paper powder removal device for machine rubber cylinder. (5) A paper powder removing device for a printing press blanket cylinder according to any one of claims 1 to 4, wherein the cleaning liquid is water.