Image forming apparatus using intermediate transfer member

Details Image forming apparatus using intermediate transfer member Image forming apparatus using intermediate transfer member

1998-06-24

1999-10-26

Smith, Matthew S.

Electrophotography

Control of electrophotography process

Control of transfer

399302, 399308, 399310, G03G 1516, G03G 1501

Patent

active

059742810

ABSTRACT:
The present invention provides an image forming apparatus for forming an image on a transfer material by using an intermediate transfer member, having a first transfer bias power supply for applying transfer bias to a first transfer unit to generate first transfer bias between a photosensitive member and an intermediate transfer member, when toner images are successively firstly-transferred onto the intermediate transfer member, and a second transfer bias power supply for providing constant current to generate second transfer bias between the intermediate transfer member and the secondary transfer electrode, and wherein the second transfer bias power supply applies, in an overlap fashion, transfer bias of current having a current value greater than a current value of the transfer bias to be applied to an upstream image area of the transfer material and having the same polarity as that of the latter transfer bias to at least a non-image area of the transfer material at an end portion thereof in a transfer material conveying direction, thereby preventing the toner images from scattering.

REFERENCES:
patent: 5438398 (1995-08-01), Tanigawa et al.
patent: 5598256 (1997-01-01), Kimura et al.
patent: 5884121 (1999-03-01), Kyung
patent: 5893661 (1999-04-01), Sakai et al.
patent: 5905013 (1999-05-01), Seto

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