Electrophotography – Control of electrophotography process – Responsive to number of copies or passage of time
Patent
1998-12-17
2000-03-07
Chen, Sophia S.
Electrophotography
Control of electrophotography process
Responsive to number of copies or passage of time
399 66, 430126, G03G 1500, G03G 1516
Patent
active
060351519
ABSTRACT:
An image forming system wherein a predetermined monitor signal is applied to a transfer roll for estimating a resistance value of the transfer roll between one sheet of recording paper passing through the contact portion between a photosensitive drum and the transfer roll and the next sheet of recording paper being introduced into the contact portion and the transfer bias applied to the transfer roll is updated in response to the estimated resistance value. In the image forming system, if the time between one sheet of recording paper passing through the contact portion and the next sheet of recording paper being introduced into the contact portion is less than a predetermined time, updating of the transfer bias is inhibited, and further if updating of the transfer bias is inhibited successively a predetermined threshold value of the number of times or more, introduction of the next sheet of recording paper is delayed a predetermined time.
REFERENCES:
patent: 5717980 (1998-02-01), Oka et al.
patent: 5761568 (1998-06-01), Haragakiuchi et al.
patent: 5887220 (1999-03-01), Nagaoka
patent: 5903798 (1999-05-01), Yokogawa et al.
Mitsuhashi Toshihiko
Ono Akinori
Saitou Kanou
Chen Sophia S.
Fuji 'Xerox Co., Ltd.
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