Patent ID: 7835662

Claim:
An apparatus for applying an electrical charge to a member to be charged, comprising: a bias roll member situated in contact with a surface of the member to be charged; means for applying an electrical bias to said bias roll member; and a cleaning mechanism for cleaning said bias roll member, said cleaning mechanism comprises an elongated web of cleaning cloth material being translated in respect to said bias roll member, cleaning mechanism further comprises a supply roll of said elongated web of cleaning cloth material, and a take-up roll for said elongated web of cleaning cloth material; a motor operatively coupled to said take-up roll to drive said take-up roll for selectively advancing of said elongated web of cleaning cloth material from said supply roll to said take-up roll to provide a clean portion of said elongated web of cleaning cloth material to clean said bias roll member, said supply roll includes a clutch mechanism coupled thereto said clutch mechanism providing a predefined drag force and wherein said clutch mechanism, said first and second idler members and said motor co-acts with each other so that said elongated web of cleaning cloth material generates a normal force on said bias roll member between 10 g/cm to 40 g/cm.