Electrophotographic copying apparatus including transfer charge corona and shield

摘要

In an electrophotographic copier, a dielectric shield is provided extending from a point adjacent the corona discharge device to a point close to the entry of the charged surface sheet of paper into the transfer nip area. The ion shield is formed of a sheet of dielectric material which extends from the cover of the corona discharge device to a point only slightly displaced to the entry side of the transfer nip. The ionic shield is biased to press against the surface of the paper so that air flow leakage to the surface of the photoconductive drum is minimized. The air flow which is naturally created by the movement of the paper is channelled out to the sides of the dielectric shield and is disbursed in an area away from the photoconductive drum.