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US 2006/0230960 A1Published application
Apparatus and method for pressing a covering onto a printing-unit cylinder for a rotary press
AssigneeMAN Roland Druckmaschinen AG
InventorsSteffen Klauss, Gunter Koppelkamm, Reinhard Naumann, Frank Oertel
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Abstract
A plurality of longitudinal channels for supplying pressure medium are arranged within a carrier having a closed profile. A plurality of operating cylinders have pressure spaces which are flow-connected to the channels for moving the pressure rollers inward and outward in order to press coverings onto a printing unit cylinder.
Claims16
An apparatus for pressing a covering onto a printing unit cylinder of a rotary press, the apparatus comprising:
- a carrier having a closed profile;
- a plurality of longitudinal channels within said closed profile;
- an operating cylinder having a first pressure space and a second pressure space flow-connected to said channels;
- and
- a pressure roller connected to said operating cylinder so that said pressure roller can be set against the printing unit cylinder by supplying pressure medium to said operating cylinder.
2 more elements
A method for pressing a covering onto a printing unit cylinder of a rotary press, said method utilizing an apparatus comprising:
- a carrier having a closed profile;
- a plurality of longitudinal channels within said closed profile, said channels comprising a first flow channel and a second flow channel;
- a plurality pressure rollers which can be set against the printing unit cylinder;
- and
- a plurality of operating cylinders, each operating cylinder having a first pressure space and a second pressure space, said first channel flow-connected to the first pressure spaces for moving the pressure rollers inward, said second channel flow-connected to the second pressure spaces for moving the pressure rollers outward in order to set the coverings on the printing unit cylinder;
- the method comprising:
- (a) holding the pressure rollers inward by feeding a pressure medium to the first pressure space with a pressure which produces a pulling-in force F1;
- (b) moving the pressure rollers outward by feeding a pressure medium to the second pressure space with a pressure which produces a pushing-out force F2, the force F2 being greater than the force F1;
- and
- (c) moving the pressure rollers inward by switching off the pressure medium at the second channel connected to the second pressure spaces of the operating cylinders for the pressure rollers which are to be moved inward.
7 more elements
Dependencies are inferred from the claim text.