Direct electrostatic printing apparatus and toner/developer...

Details Direct electrostatic printing apparatus and toner/developer... Direct electrostatic printing apparatus and toner/developer...

G - Physics

03

G

32/12.08, 32/12.

G03G 17/00 (2006.01) G03G 15/08 (2006.01) G03G 15/09 (2006.01) G03G 15/34 (2006.01)

Patent

CA 1302074

ABSTRACT OF THE DISCLOSURE 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.

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