JPH1067100A - Method and apparatus for washing guide roller of printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and optimally wash a guide roller for guiding a web in a printing press. SOLUTION: In a printing press, a web 2 is provided so as to be guided on guide rollers 3 and, in order to wash these rollers, the positions of the respective rollers are determined and, at this time, a washing soln. is applied to the continuously operated web over the longitudinal direction thereof by an applicator 5 and the washing soln. over the longitudinal direction is transferred to the rollers and, when the rollers reach the proper part of the washing soln. over the longitudinal direction, the respective rollers are braked in a pulse like manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning a guide roller for guiding a web in a printing press.

[0002]

Printing presses are often provided with a number of guide rollers for guiding the web for further processing after printing. In many cases, the total number of such rollers is many times larger than an appropriate number for a certain application.

A roller that has been used for a certain period of time is contaminated with printing ink residue, paper fibers, etc., causing a set-off problem, and necessitating cleaning of the roller.

Conventionally, webs have been removed from printing presses and the used rollers have been manually cleaned with a cleaning liquid. Of course, such manual cleaning takes time, splashes,
After washing, it is necessary to guide the web again to the printing press by hand.

[0005]

According to the present invention, the position of each roller (3) to be cleaned is determined, and the cleaning liquid is spread longitudinally at a position separated from the roller of the continuously operating web (2). A guide roller on which the web (2) of the printing press is guided on the rollers, which feeds the longitudinal cleaning liquid to each roller and brakes each roller in a pulsed manner when it reaches the appropriate part of the longitudinal cleaning liquid. A method for cleaning (3) is provided.

More specifically, the position of each roller to be cleaned (x and y coordinate values in the printing machine's coordinate system), the diameter of the roller and the speed of the web are sent to a computer for optimal cleaning. A suitable roller braking sequence to obtain a result is determined.

[0007] As the web slides on the braked rollers, the web tension increases and ultimately the web breaks and wins. Therefore, only a certain number of rollers need to be braked simultaneously.

As described above, the operation sequence for obtaining the best cleaning result is determined, and this sequence can handle more than the maximum number of rollers described above. However, in order to avoid breakage of the web, braking is performed simultaneously. Limit the number of rollers.

The X, Y coordinate values and the diameter of each roller of the printing press together with the corresponding ordinal are pre-input to a computer. In one embodiment, only the ordinal rollers of the rollers used are entered into the computer in the order in which they contact the web.

[0010] The length of the cleaning liquid on the web is preferably arranged to be applied by an applicator provided at a distance from the rollers of the printing press.

The above-mentioned procedure means that a cleaning liquid having a predetermined length is applied to a roll of paper and transferred to each roller to be cleaned. The rotating roller is supplied with cleaning liquid from the web.

[0012]

According to the above construction, the roller is braked in a pulsed manner to cause friction to be washed, thereby greatly improving the washing action. If necessary, the roller may be braked in a pulsed manner when the dry portion of the web reaches the roller in order to enhance the cleaning and drying properties of the roller.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS An example of a printing press is shown in the drawings. If the printing press is an offset printing press, it has a number of printing units 1 such as an ink train section, a dampening component, a plate cylinder and a blanket cylinder. (On the other hand, it is to be understood that the invention is applicable to other types of printing presses.) The web 2 passes through a blanket cylinder in the printing unit 1 at the point of printing.

After printing, the web is continuously moved from a very large number of guide rollers all provided in the printing press to a smaller number of guide rollers. The selected path of the web is determined according to different alternative processes in the printing press.

In one application, a braking device 4 is provided on each roller 3 through which the web 2 passes, the braking device 4 stopping the rollers. This braking device 4 can be actuated electrically or hydraulically, for example, mechanically. Other configurations can be used for this.

An applicator 5 for the cleaning liquid is arranged on the web 2 preferably upstream or downstream of the printing unit 1. For a detailed description of this applicator, see Applicant's co-pending application Ser.
Since it is described in No. 4660-3, it will not be described in detail here. On the other hand, the cleaning liquid is transferred from the applicator 5 to the web 2 by a roller driven by the applicator 5. If there is no movement of the cleaning liquid, the roller is retracted without contacting the web 2.

The printing press is provided with a computer-based control system, and executes a cleaning sequence described below.

The position of each roller 3 used in a particular embodiment is provided to the computer as a reference point in the printing press, for example, an X, Y coordinate value with respect to the applicator 5 as a reference point. It is also necessary to input the position of a roller or a bar member which guides the rolled paper but is not a cleaning target to the computer. Other data sent to the computer are the speed of the web 2 and the diameter of each roller 3 that moves the web 2. The winding angle of the web 2 moving around each roller 3 is calculated by a computer.

Based on the computer data generated in this way, the control system operates the mechanism of the printing press in the following manner to clean each roller 3 used in a specific embodiment, Removes adhering paper fibers, printing ink residues and the like.

That is, the web 2 is moved at a predetermined speed in the printing press structure. The applicator 5 applies a cleaning liquid to the web over a predetermined length, and the supply length of the cleaning liquid can be fixed or suitably changed according to the number of rollers to be cleaned. Based on the data entered and braking only a predetermined number of rollers at a time to prevent breakage of the web, the computer determines a predetermined braking sequence for the roller braking device to obtain optimal cleaning results. . When a suitable portion of the cleaning liquid over the length reaches the rotating roller 3, the cleaning liquid is transferred to that roller. In order to greatly improve the cleaning effect of the roller by the friction effect, it is preferable to brake the roller in a pulse shape by the braking device 4.

Next, the washing liquid is removed together with dirt by the next drying portion of the web 2. Although the cleaning and drying effect can be improved by pulsing the rollers at this stage, it will be understood that the main cleaning effect is obtained in the first stage with the cleaning liquid.

[0022]

According to the present invention, the position of each roller (3) to be cleaned is determined, and the cleaning liquid is applied to a portion of the web (2) that is continuously operated and separated from the roller, and the cleaning liquid is applied over the length. A guide roller (3) on which the web (2) of the printing press is guided over the rollers, transferring the cleaning liquid to each roller and braking each roller in a pulsed manner when it reaches the appropriate part of the longitudinal cleaning liquid; Washing method can be realized simply,
Optimal cleaning effect can be realized.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of a printing press embodying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing unit 2 Web paper 3 Roller 4 Braking device 5 Applicator

Claims (10)

[Claims] 1. A position of each roller (3) to be cleaned is determined, a cleaning liquid is applied to a portion of the web (2) which is continuously operated and separated from the roller, and the long cleaning liquid is transferred to each roller. A method for cleaning the guide rollers (3), on which the web (2) of the printing press is guided on rollers, wherein each roller is braked in a pulsed manner when it reaches the appropriate part of the longitudinal cleaning liquid. 2. A computer is provided with the position of each roller (3) to be cleaned, the diameter of the roller, and the speed of the web (2), which are expressed as X and Y coordinate values in the coordinate system of the printing press,
The method of claim 1 wherein a suitable roller braking sequence that provides optimal cleaning results is determined. 3. The method according to claim 1, wherein the maximum number of rollers which are simultaneously braked is determined so as to avoid breaking of the web due to an increase in the pulling force of the web. 4. The method according to claim 3, further comprising the step of determining an operating sequence which gives the best cleaning result, said sequence being able to handle more than the maximum number of rollers which are not simultaneously braked. 5. First, the X and Y coordinate values of the printing press and the diameter of each roller (3) are entered into a computer together with the corresponding ordinal number, and in one setting example only the ordinal number of the roller used is taken into the web (2). The method according to any one of claims 1 to 4, wherein the input is made to the computer in the order of engagement. 6. The method as claimed in claim 1, wherein the cleaning liquid is applied over the length of the web by means of an applicator remote from the rollers of the printing press. 7. The method according to claim 1, wherein the roller to be cleaned is braked by a braking device. 8. An applicator (5) that is disposed apart from a roller (3) to be cleaned and that applies a cleaning liquid to a continuously operating web (2) over a longitudinal direction; A computer for inputting data relating to the position and data relating to the diameter of each roller to control the operation of the apparatus, and a braking device for applying a pulse-like braking to the corresponding roller when an appropriate portion of the cleaning liquid over the length passes over each roller. (4) a device for cleaning a guide roller (3) on which a web (2) of a printing press is guided on a roller. 9. Apparatus according to claim 8, wherein the applicator (5) is provided with an application roller which is brought into contact with the web (2) when applying the cleaning liquid to the web. 10. Apparatus according to claim 8, wherein the braking device (4) of the applicator is electrically controlled, braked hydraulically and actuated mechanically.