Printing – Printing members – Plate mountings
Patent
1976-02-27
1977-11-01
Kinsey, Russell R.
Printing
Printing members
Plate mountings
1014151, 269 21, 271276, B41F 2712, B25B 1100
Patent
active
040560570
ABSTRACT:
An improved form of vacuum-operated printing cylinder for a printing press, providing a practical means for holding the printing plate on the cylinder by vacuum alone. The cylinder comprises a hollow supporting shaft forming a pre-evacuation chamber. A plurality of axially spaced support rings are secured to the shaft and support a hollow cylinder sleeve. The cylinder sleeve, support rings and shaft form a hollow printing cylinder structure having a plurality of vacuum chambers. Each of the vacuum chambers is provided with independently valved air passage means for communication between the chamber and the pre-evacuation chamber. The cylinder sleeve is provided with a plurality of appropriately distributed radial passages for vacuum communication between the vacuum chambers and the exterior surface of the printing cylinder. The pre-evacuation chamber is connected by piping to a vacuum source and kept evacuated. To particular advantage, the vacuum effect of the pre-evacuation chamber can be immediately applied to the cylinder surface, by opening the appropriate valves, to effect a preliminary gripping of the printing plate.
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Hirsch Paul J.
Kinsey Russell R.
Livermore and Knight Co., Inc.
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