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Abstract

An electrographic copier has a moveable dielectric member, a developing station for applying toner to selected areas of the dielectric member, and cleaning apparatus for removing residual toner from the dielectric member. The cleaning apparatus includes wall structure defining a cavity open to the dielectric member, and having close-clearance gap regions between the wall structure and the dielectric member magnetically permeable cleaning fluid fills the cavity. Magnetic field producing structure magnetically coupled through the cleaning fluid in the gap regions forms a magnetic seal in the gap regions, thereby inhibiting leakage of the cleaning fluid from the cavity through the gap regions.

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First Claim