Toner image transfer method and device for electrophotographic p

Details Toner image transfer method and device for electrophotographic p Toner image transfer method and device for electrophotographic p

1989-04-27

1992-12-01

Braun, Fred L.

Photocopying

Contact printing

Light boxes

G03G 1516

Patent

active

051683130

ABSTRACT:
A method and device of toner image transfer for an electrophotographic printing apparatus capable of obtaining stable high quality images regardless of the environmental conditions. The device includes a transfer roller having an outermost resistive layer; a flexible conductive layer inside the outermost resistive layer which is electrically connected to the resistive layer; an elastically deformable elastic sponge rubber layer inside the conductive layer; a metallic shaft inside the elastic sponge rubber layer to which a transfer bias voltage is applied; and an elastically deformable elastic conductive portion electrically connecting the metallic shaft and the conductive layer. In carrying out the method, the transfer bias voltage is applied in pulsed form. Also, an area to be transferred is detected by a sensor, so that toner is supplied only to the detected area, while controlling a leveling blade located around a sleeve of a developing device for limiting the amount of toner on the sleeve, such that an amount of the toner supplied from the sleeve is changed.

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