Coating apparatus for sheet-fed, offset rotary printing presses

Details Coating apparatus for sheet-fed, offset rotary printing presses Coating apparatus for sheet-fed, offset rotary printing presses

1993-04-26

1994-08-09

Eickholt, Eugene H.

Printing

Inkers

Roller

101351, 101367, 101147, 118261, B41F 3100

Patent

active

053355962

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 reservoir to the surface of a pickup roller 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 a positive pressure differential within the doctor blade reservoir. The doctor blade reservoir is maintained at below ambient pressure level, thereby preventing leakage through the end seals. A vacuum sensor circuit 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.

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