Image forming apparatus

Details Image forming apparatus Image forming apparatus

1998-06-29

2000-04-11

Chen, Sophia S.

Electrophotography

Control of electrophotography process

Of plural processes

399 50, 399 66, 399101, 399302, G03G 1500

Patent

active

060496819

ABSTRACT:
An image forming apparatus has an image bearing member, an image forming unit adapted to form a toner image on the image bearing member and having a first charge member for charging the image bearing member with the same polarity as normal polarity on toner, an intermediate transfer member, a voltage apply means for applying voltage to the intermediate transfer member to electrostatically transfer the toner image formed on the image bearing member by the image forming unit onto the intermediate transfer member at a first transfer station, a second charge member for charging residual toner remaining on the intermediate transfer member with polarity opposite to the normal polarity of the toner on the image bearing member, after the toner image on the intermediate transfer member is electrostatically transferred onto a transfer material at a second transfer station, and a controller for variably controlling voltage applied to the first charge member, and the voltage application generates an electric field for transferring the residual toner on the intermediate transfer member charged by the second charge member onto the image bearing member and at the same time transferring a next toner image on the image bearing member onto the intermediate transfer member, at the first transfer station, and, the control unit controls voltage applied to the voltage application in accordance with the voltage applied to the first charge member, when the electric field is generated at the first transfer station.

REFERENCES:
patent: 5512986 (1996-04-01), Toyomura et al.
patent: 5671462 (1997-09-01), Toyohara et al.
patent: 5732310 (1998-03-01), Hiroshima et al.
patent: 5754920 (1998-05-01), Tanaka et al.
patent: 5809373 (1998-09-01), Yoda et al.

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