B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
B05C 1/08 (2006.01) B05C 11/04 (2006.01) B41F 23/08 (2006.01) D21H 23/58 (2006.01)
Patent
CA 2094694
ABSTRACT A coating apparatus for use in a sheet-fed or web-fed, offset rotary or flexographic printing press to apply a protective and/or decorative coating to the surface of freshly printed sheets includes a doctor blade coating unit coupled to a pickup roller for supplying liquid material from a remote supply drum to sheets transported on the surface of a transfer/delivery cylinder mounted on a press delivery drive shaft. Liquid material is circulated through the reservoir of the doctor blade unit by suction flow produced by a return pump. This prevents the buildup of positive pressure within the doctor blade reservoir. The doctor blade reservoir is maintained at below ambient pressure level, thereby inhibiting leakage through the end seals. A vacuum sensor assembly provides a visual indication of air vacuum pressure in the doctor blade reservoir chamber, and a vacuum sensor switch applies electrical power to an audio transducer. The audio transducer produces an audible alarm in response to an increase in doctor blade chamber pressure, thereby providing advance warning of an impending end seal failure or a worn doctor blade condition.
Demoore Howard Warren
Person Steven M.
Demoore Howard Warren
Moffat & Co.
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