Electrophotography – Diagnostics – Image forming component
Reexamination Certificate
2007-12-04
2007-12-04
Royer, William J. (Department: 2852)
Electrophotography
Diagnostics
Image forming component
C399S051000, C399S055000, C399S066000, C399S069000
Reexamination Certificate
active
11151462
ABSTRACT:
An image forming apparatus is provided which can form an image without defective transfer even if a resistance value of a transfer device is so high that defective transfer tends to occur. Before starting operation of printing an image on a sheet, a transfer current is passed to a transfer roller so as to detect a voltage value V of a transfer voltage. When it is determined that the detected voltage value V does not exceed a reference voltage value Vr (resistance value of the transfer roller does not exceed a reference limiting value), an operation mode of the printing operation is set to a first printing mode. When it is determined that the detected voltage value V exceeds a reference voltage value Vr (resistance value of the transfer roller exceeds a reference limiting value), the operation mode of the printing operation is set to a second printing mode.
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patent: 6542703 (2003-04-01), Jung
patent: 7050732 (2006-05-01), Bae et al.
patent: 7062186 (2006-06-01), Kyung
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patent: 2000-221810 (2000-08-01), None
patent: 2002-014551 (2002-01-01), None
patent: 2003-295636 (2003-10-01), None
Banner & Witcoff Ltd
Brother Kogyo Kabushiki Kaisha
Royer William J.
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