Image forming apparatus with residual toner transfer...

Details Image forming apparatus with residual toner transfer... Image forming apparatus with residual toner transfer...

2006-09-12

2008-12-23

Brase, Sandra L (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

Reexamination Certificate

active

07469109

ABSTRACT:
A printer20includes a photosensitive drum1, a charge roller2for electrically charging the photosensitive drum1, a developing device4for developing an electrostatic latent image on the photosensitive drum1into a toner image, a transfer roller5for transferring the toner image onto a recording material, and a transfer residual toner charging member8for electrically charging toner remaining on the photosensitive drum1. In the printer, a DC voltage substantially identical to a potential on the photosensitive drum1before the photosensitive drum1reaches the charge roller2is applied to the charge roller2together with application of a voltage of an identical polarity to a charge polarity of toner to the transfer residual toner charging member8during a current measuring operation for measuring a value of AC current passing through the charge roller2, in order to set a condition of a voltage to be applied to the charge roller2during image formation, by applying an AC voltage to the charge roller2.

REFERENCES:
patent: 6532347 (2003-03-01), Watanabe et al.
patent: 6640063 (2003-10-01), Adachi et al.
patent: 2004/0013438 (2004-01-01), Watanabe et al.
patent: 2004/0086297 (2004-05-01), Watanabe
patent: 2004/0131385 (2004-07-01), Yoshikawa
patent: 2001-201921 (2001-07-01), None

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