JPH03128249A - Method and device to clean guide roller - Google Patents

Abstract

PURPOSE: To rapidly, effectively clean guide rollers by injecting a printing ink solvent in a given length of a sheet by nozzles, passing it on the rollers to dissolve the ink, and wiping off the ink from the rollers by a part of the sheet in which the ink is not injected. CONSTITUTION: A take-up sheet 2 is injected along a length adapted to a cylindrical surface of downstream guide rollers, number of the rollers and the degree of dirts of the rollers. The injection is conducted when a piston rod 8 continuously longitudinally moves nozzles 4, 5 along an injection unit 3 of a cleaning substance 6. The substance 6 constituted by a solvent for a printing ink not to weaken the sheet 2 is transferred to the rollers 11 based on a sinusoidal curve shape of an injected area, and part of the ink on the roller 11 moistened by the substance is substantially immediately wiped by a non-moistened part of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and method for cleaning the guide rollers of a stamping machine.

[Prior Art] In conventional printing machines, the web of printing paper is printed on one or both sides of the paper from a feed roller through the printing machine, and then when the printing is completed, one It moves over these guide rollers to a paper folding device, where the printed web is cut and folded. The guide rollers are either free rotating or motor driven for rotation. Dozens of such rollers are provided to guide each web between the printing machine and the folding device.

These L''-colors are continuously smeared from printing ink from printing on the paper. It is therefore necessary to periodically remove these ink deposits from the guide rollers to prevent folds in the web and transfer of ink deposits onto the web. Various methods are known for manually cleaning such guide rollers. For example, following removal of the web, the guide rollers are stripped of such deposits, with or without the aid of cleaning substances. This method of cleaning is labor intensive and time consuming, and is also very expensive.

Methods of mechanically removing printing ink from printing rollers are also known. An example of such a method is tJs4058
059. US4344361. EP0257818,S
Hi455396.5E417298, LIS312
0805. It is shown in Lno.82731916. In principle, the methods disclosed in these publications involve attaching a movable cleaning device to a dirty printing roller. The printing ink solvent is transferred from the cleaning device to the printing roller by spraying or brushing.

The molten printing ink is wiped off from the roller with a piece of paper or paper that is placed in the form of a roll in a cleaning device.
Alternatively, it may be removed by a brush or knife on the device. However, the above method is only suitable for cleaning printing rollers. Cleaning units of the above type are very bulky, relatively small and very expensive for use in cleaning relatively large numbers of guide rollers. In history,
In many cases, the use of such cleaning units requires that the web be removed from the guide roller.

[Invention tries to solve: 1! The present invention provides a method and apparatus for cleaning a guide roller, which avoids the above-mentioned problems, etc., so that the guide roller can be cleaned by any conventional method or method without removing the web. The device is cleaned more quickly and effectively.

[Example] The web 2 passes from the printing device 1 past the jetting device 3,
The injection device 3 includes one or more nozzles, two of which
．． 5 is shown and is operative to spray a cleaning substance 6 onto the web 2. For this purpose, the injection device may alternatively be arranged adjacent to a part of the web 2 which is arranged in front of the printing device Tl11. The cleaning substance 6 is composed of a substance which does not weaken the web 2 and may, for example, consist of a distillate of the minerals which constitute the solvent for many printing inks. When the web 2 has a narrow convergence, the cleaning device operates with only one nozzle 4.5. When the web is wide, the cleaning device operates with several nozzles 4.5.

The nozzles 4, 5 are fixedly attached to the piston rod 8. In operation, the nozzles 4.5 are held apart at a constant mutual spacing. However, advantages are obtained when the nozzle spacing can be changed when no injection is achieved. When the injector is in operation, the nozzle 4.5 can have a fixed position with respect to the 111ti4 inlet 3 or can be moved intermittently or continuously in the longitudinal direction by the piston rod 8 in different ways over almost the entire length of the injector 3. can be moved along.

In the case of a first preferred embodiment, the web 2 is jetted along its length which is adapted to the cylindrical surface of each of the downstream guide rollers, the number of such rollers present and the degree of kneading with which the rollers are soiled. . For injection, the piston rod 8 is connected to the nozzle 4.
This is done when moving the injector 5 continuously back and forth along the injector 3. The jetted area of the web 2 therefore has a sinusoidal shape, as indicated by 9 and 10.

When the jetted part of the web 2 reaches the guide roller 11, the roller is subsequently braked in a pulsed manner, and the tangential speed of the roller increases while applying the braking pulse to the web 2.
It is different from 1 degree. The rotation speed of roller 11 is till
The best effect is achieved when the roller 11 comes to a complete standstill in a pulsed manner. Said pulses are preferably variable in duration to suit the desired cleaning effect.

Alternatively or complementarily, the guide roller 11
may be displaced back and forth in a direction perpendicular to the direction of movement of the web 2 while in contact with the jetted portion of the web 2. In such a case, the cleaning substance 6 is transferred to the roller 11 on the basis of the sinusoidal shape of the sprayed area, so that the part of the ink on the roller 11 wetted by the cleaning substance or solvent 6 is It is wiped off almost immediately by the unwetted portion of the web. This allows the printing ink on the guide loaf-11 to be wetted and wiped off in a single step with minimal paper consumption.

According to other embodiments, the web 2 is instead arranged in a fixed position with respect to the injector 3 and the nozzle 4.5
The cleaning substance 6 is thereby impregnated into the web 2 substantially across its entire width. In such a case, the guide roller 11 is first moistened with the cleaning substance 6 and then wiped clean in a separate step by the subsequent non-sprayed part of the web 2.

When the paper web 2 has passed all the guide rollers 11 present, the resulting soiled paper is discarded and printing is resumed without any delay.

Preferably, the guide roller 11 is completely stopped.
The braking of the roller 11 is controlled in a pulsed manner in the first embodiment only when the guide roller 11 comes into contact with the rolled paper 2, and in the second embodiment Alternatively, the number of guide rollers braked at the same time is controlled such that the amount of subsequent wiping of the rollers on the non-jetted part of the web 2 is controlled, preferably to a complete stop, until the web 2 is torn. No more than that number.

The invention has been described above with respect to cleaning the guide rollers of a printing press. However, this method also
It is obvious that the invention is also applicable to other cleaning devices that come into contact with miscellaneous materials, and that modifications can be made within the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of the printing press and the paths formed by the web between the different units incorporated in the printing press;
FIG. 2 is a perspective view showing the arrangement of the guide rollers in the printing press; FIG. 3 is a perspective view showing the arrangement of the guide rollers in the printing press; FIG. FIG. 4 is a schematic diagram showing the shape of a narrow web jetted according to a first embodiment of the invention; FIG. 5 is a longitudinal sectional view showing a first embodiment of the invention FIG. 2 is a schematic diagram showing the shape of a narrow web that is jetted according to an example; 1...Printing device, 2...Paper, 3...Ejection device, 4
．． 5... Nozzle, 6... Ink solvent, 11... Guide roller

Claims (8)

[Claims] (1) A method of cleaning a guide roller (11) forming part of a printing device having a printing device (1) and a printing paper (2), the paper (2) being printed in the printing device (1). After passing through the printing device (1), the paper passes through a jetting device (3) which in turn passes through one or more nozzles (4). , 5) by means of nozzles (4, 5) a defined length of the paper (2) is intermittently or continuously injected on one or both sides thereof with a printing ink solvent (6), e.g. mineral oil distillate. The paper is then passed through one or more guide rollers (11
), during which the solvent (6) is transferred to the roller and dissolves the printing ink deposited on the roller, which ink is then transferred to the paper (
2) is blown away from the roller (11) by the non-sprayed part of the paper (2), the part of the paper (2) moistened with solvent and stained with printing ink is discarded, and the part of the paper (2) that is untouched is printing can then be started without replacing the paper (2). (2) Guide roller (1) according to claim 1
1) is a method of cleaning paper (
2) the length is controlled manually or automatically depending on the number of guide rollers (11) present and the total area of their cylindrical surfaces and also on the degree to which they are soiled;
Method. (3) A method for cleaning a guide roller (11) according to any one of claims 1 and 2, which includes paper (
2) passes over the guide roller (2) to apply the solvent (6) onto said roller (11) or to wipe the printing ink from it, said roller is preferably pulsed and braked to remove the paper (2). A method characterized in that a tangential velocity different from the velocity of is achieved, said tangential velocity being preferably zero, and that said pulses are of variable duration and adapted to the desired cleaning effect. (4) A method for cleaning a guide roller (11) according to any one of claims 1 and 2, which includes paper (
2) passes over the guide roller (2) to apply the solvent (6) onto said roller (11) or wipe the printing ink from it, the guide roller moves the paper (2) in the same plane as the paper (2). The tangential speed of the guide roller (11) is equal to the speed of the paper (2), or the tangential speed of the guide roller (11) is
) deviates from the velocity of the paper (2) in pulses, said tangential velocity being preferably zero therewith, and said pulses being of variable duration to suit the desired cleaning effect. , a method characterized by: (5) A method for cleaning the guide roller (11) according to any one of claims 3 and 4, preferably by automatically controlling the braking force.
) is brought to a complete stop and the number of rollers (11) which are simultaneously braked and preferably brought to a complete stop does not tear the paper (2). (6) A method for cleaning a guide roller (11) according to any one of claims 1 to 5,
During the jetting of the paper (2), one or more nozzles (4, 5) are continuously moved back and forth along substantially the entire length of the jetting device (3), so that the solvent (6) is directed in a substantially sinusoidal path. And paper (
2) At the same time, the guide roller (11) is impregnated with the solvent (6) and then the guide roller (11)
A method in which a minimum (2) consumption is achieved for wiping off the printing ink dissolved from the guide roller (11) and cleaning the guide roller (11). (7) A device for cleaning a guide roller (11) installed in a printing machine having a printing device (1) and a printing paper (2), in which the injection device (3) has one or more nozzles (4,
5), the nozzles (4, 5) intermittently or continuously spray the printing ink solvent (6) onto a predetermined length of the paper (2), preferably onto the predetermined portion of the paper (2). A device that injects in a shape such as a sinusoidal shape. (8) Guide roller (1) according to claim 7
1), in which the nozzles (4, 5) are mounted on a piston rod (8) and the piston rod (8) is stationary with respect to the injector (3) or A device that moves back and forth along substantially its entire length, in which the nozzles (4, 5) are spaced apart constantly during the injection operation, and the nozzle spacing can be varied when no injection is taking place.