Importance

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Abstract

A drum, such as a drum for an electrostatic photocopying unit, is given a uniform coating of a liquid coating composition, such as an organic photoconductor, by arranging the drum on a vertical axis coaxially with a vessel containing a body of the coating composition of a depth generally equal to the vertical length of the drum, bringing the drum and vessel into substantially telescoping relation to dip the drum substantially into the coating composition, and causing the drum and vessel to undergo relative vertical displacement along the vertical axis by the sole force of gravity to thereby bring about a progressive vertical separation of the drum from the vessel leaving a coating of the composition on the drum surface. The separation is preferably controlled at a uniform rate by means e. g. of a hydraulic cylinder supporting a movable one of the drum and vessel in opposition to the force of gravity while the gravitational force can be augmented by increasing the effective mass of the movable one.

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First Claim