Corona generator cleaning apparatus

An electrophotographic printing machine of the type having a photoconductive surface adapted to be sensitized by the application of a substantially uniform electrostatic charge from an ion source closely spaced to the photoconductive surface, wherein the improvement in said ion source includes:

• an elongated shield defining an open ended chamber, said shield being positioned to extend substantially transversely across the photoconductive surface;
• a pair of spaced substantially parallel conductive coronode wires mounted in said shield, said pair of coronode wires extending substantially in a longitudinal direction along the length of said shield;
• a plurality of spaced, substantially parallel conductive grid wires mounted in said shield and extending substantially in a longitudinal direction along the length thereof, said plurality of grid wires partially enclosing the open end of said shield with one of said coronode wires being disposed in the chamber therebeneath and the other of said coronode wires being disposed in the unenclosed portion of the chamber of said shield, said grid wires being interposed between the photoconductive surface and said shield;
• a wiper member positioned within said shield contacting said pair of coronode wires and the interior surface of said grid wires opposed from said pair of coronode wires;
• and
• means for moving said wiper member in substantially a longitudinal direction along the length of said pair of coronode wires and said grid wires.