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US 4,814,796 AGranted
Direct electrostatic printing apparatus and toner/developer delivery system therefor
AssigneeXerox Corporation
InventorFred W. Schmidlin
Life of this patent
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AssigneeXerox Corporation
InventorFred W. Schmidlin
Estimating the term…
Direct electrostatic printing apparatus including structure for delivering developer or toner particles to a printhead forming an integral part of the printing device. The printing device includes, in addition to the printhead, a conductive shoe which is suitably biased during a printing cycle to assist in the electrostatic attraction of developer through apertures in the printhead onto the copying medium disposed intermediate the printhead and the conductive shoe. The structure for delivering developer or toner is adapted to deliver toner containing a minimum quantity of wrong sign and size toner. To this end, the developer delivery system includes a conventional magnetic brush which delivers toner to a donor roll structure which, in turn, delivers toner to the vicinity of apertures in the printhead structure.
Printing apparatus including a toner delivery system, a printhead structure containing a plurality of apertures adapted to transport toner therethrough which toner is supplied by said delivery system to the vicinity of said apertures and means for supporting copy substrates for movement past said printhead, said supporting means being adapted to attract toner transported from said delivery system through said printhead whereby said toner is deposited in image configuration on said copy substrate, the improvement comprising:
Toner delivery apparatus for presenting toner to a printhead structure, said toner delivery system comprising:
Dependencies are inferred from the claim text.