Electrophotography – Internal machine environment – Particle or contaminant control
Patent
1998-03-04
1999-11-23
Pendegrass, Joan
Electrophotography
Internal machine environment
Particle or contaminant control
399302, G03G 1501, G03G 2100
Patent
active
059915676
ABSTRACT:
The present invention provides an image forming apparatus in which, after secondary transferring, secondary transferring residual toner remaining on an intermediate transfer member can be cleaned effectively. A cleaning roller 5g is contacted with an intermediate transfer belt 5a and bias is applied from a power source 5h to the cleaning roller 5g, thereby charging secondary transferring residual toner remaining on the intermediate transfer belt 5a with polarity opposite to normal polarity of toner in a developing means 4. In this case, a rectangular wave of alternate voltage having a duty ratio of 50% or more is used as the bias. Whereby, the secondary transferring residual toner can be charged uniformly, the cleaning ability for the secondary transferring residual toner can be improved.
REFERENCES:
patent: 5099286 (1992-03-01), Nishise et al.
patent: 5457487 (1995-10-01), Sakaki et al.
patent: 5722015 (1998-02-01), Tombs
Kobayashi Tatsuya
Suzuki Takehiko
Tsuruya Takaaki
Canon Kabushiki Kaisha
Pendegrass Joan
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