Patent Application
20080216694
This application claims the priority of German Patent Document No. 10 2007 010 761.9, filed Mar. 6, 2007, the disclosure of which is expressly incorporated by reference herein.
The invention relates to an apparatus and method for cleaning guide rollers of a printing unit, in particular of a 9-cylinder satellite printing unit of a web-fed printing press.
Printing units of web-fed printing presses known from practice have several printing couples, wherein each printing couple features a transfer cylinder, a plate cylinder, an inking system as well as, if applicable, a dampening system. The plate cylinders are also designated as engraving cylinders and the transfer cylinders are also called blanket cylinders. In addition, these types of printing units feature impression cylinders, wherein an impression cylinder can cooperate with one or more transfer cylinders of different printing couples. The impression cylinders are also designated as satellite cylinders, which is why printing units with at least one impression cylinder are also called satellite printing units. In addition to satellite printing units that have impression cylinders, printing units that do not have any impression cylinders are known, wherein, in the case of printing units without impression cylinders, the transfer cylinders of two printing couples roll off one another.
A printing unit of a web-fed printing press that is embodied as a 9-cylinder satellite printing unit has four printing couples and consequently four plate cylinders as well as four transfer cylinders, wherein the transfer cylinders of all four printing couples roll off a common impression cylinder. A total of four print positions are embodied between the impression cylinder and the four transfer cylinders, whereby a to-be-printed printing substrate is conveyed through these print positions to be printed.
Thus, a to-be-printed printing substrate of a first print position of a 9-cylinder satellite printing unit is fed via a feed roller, and a printing substrate printed in such a satellite printing unit is discharged from the satellite printing unit starting from a fourth and thus final print position via a discharge roller. The printed printing substrate thus proceeds off the discharge roller with its print side that has just been printed in the printing unit, whereby there is a danger that printing ink will collect on the discharge roller that will impede transport of the printing substrate in the region of the discharge roller. Therefore, it is necessary to clean at least the discharge roller. Until now no cleaning devices for guide rollers of a printing unit have been known from practice, which permit effective cleaning of the guider rollers, in particular the discharge roller.
Starting herefrom, the present invention is based on the objective of creating a novel satellite cleaning device for guide rollers of a printing unit of a web-fed printing press. The cleaning device according to the invention has a cleaning body fastened to an actuating grip, which body can be inserted between guide rollers of a printing unit, wherein a cleaning cloth that can be wetted with cleaning fluid can be fastened to the cleaning body, and wherein the cleaning body features cleaning surfaces on opposing sides that are adapted to the contour of the guide rollers. Effective cleaning of the guide rollers, particularly the discharge roller, of a printing unit is possible with the inventive cleaning device.
The actuating grip preferably engages on an upper section of the cleaning body, whereby the cleaning surfaces are embodied on a lower section of the cleaning body, and whereby a clamping device is allocated to the upper section of the cleaning body, in order to clamp the cleaning cloth on the cleaning body.
Preferred developments of the invention are yielded from the following description. Without being limited hereto, one exemplary embodiment of the invention is explained in greater detail on the basis of the drawings.
In order to convey a to-be-printed printing substrate in a defined manner through the print positions of the satellite printing unit 10, the printing unit has two guide rollers, namely a so-called feed roller 19 and a so-called discharge roller 20. A to-be-printed printing substrate is conveyed to the nip 17 via the feed roller 19 and, on the other hand, an already printed printing substrate is discharged from the printing unit 10 via the discharge roller 20 starting from the nip 18. In the process, the side of the printing substrate printed in the printing unit 10 rolls off the discharge roller 20, whereby the discharge roller can get contaminated by deposits of printing ink.
The present invention makes available a cleaning device 21 for cleaning the guider rollers of such a printing unit, particularly for cleaning the discharge roller 20 that is susceptible to contamination. The cleaning device 21 has a cleaning body 23 fastened to an actuating grip 22, which can be inserted between guide rollers 19, 20 of the printing unit 10 as shown in
The actuating grip 22 engages on an upper section of the cleaning body 23 in an articulated manner, and the cleaning surfaces 24 and 25 are embodied on a lower section of the cleaning body 23. An axis 26, around which the cleaning body 23 is fastened in an articulated manner to the actuating grip 22, extends perpendicularly to the longitudinal direction of the cleaning body 23 as well as to the longitudinal direction of the cleaning surfaces 24, 25 as shown in
To clean the guide rollers 19, 20, particularly the discharge roller 20, a cleaning cloth (not shown) that can be wetted with cleaning fluid can be fastened to the cleaning body 23, wherein a clamping device 27 allocated to the upper section of the cleaning body 23 is used for this. A cleaning cloth fastened to the cleaning body 23 with the aid of the clamping device 27 wraps around the cleaning body 23 in its longitudinal direction in such a way that the cleaning cloth covers the cleaning surfaces 24, 25 that are adapted to the contour of the guide rollers.
According to
In a first cleaning step, a first cleaning surface 24 is adjacent to the feed roller 19 and a second cleaning surface 25 is adjacent to the discharge roller 20, wherein by executing a swivel motion with the actuating grip 22, the cleaning body 23 can be moved in this position over the entire axial extension of the guide rollers 19, 20. This first cleaning step is used to loosen the contamination on the discharge roller 20.
Then the cleaning body 23 of the cleaning device 21 is pulled out from between the guide rollers 19, 20, rotated 180° and then re-inserted between the two guide rollers 19, 20 so that for a second cleaning step after rotating the cleaning device 21, the first cleaning surface 24 of the cleaning body 23 is adjacent to the discharge roller 20 and the second cleaning surface 25 is adjacent to the feed roller 19. During this second cleaning step, the already loosened contamination can be removed from discharge roller 20. In this case as well, the cleaning body 23 is moved along the entire axial extension of the guide rollers 19, 20 via the actuating grip 22.
The inventive cleaning device 21 is used accordingly to manually clean the guide rollers 19, 20, whereby according to
The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2007 010761.9 | Mar 2007 | DE | national |
