Image forming apparatus
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jul 21, 2011
app pub date -
Jan 21, 2011
filing date -
Jan 21, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An image forming apparatus includes: a photosensitive drum; a development roller; a transfer roller; a drum driving unit that includes a forwardly and reversely rotatable motor; a forward transport unit; a reverse transport unit; and a transfer potential control unit that is configured to control a surface potential of the transfer roller to have a reverse polarity to that of the developer on the photosensitive drum during the forward rotation of the motor and control the surface potential of the transfer roller to be a potential that has the same polarity as the developer on the photosensitive drum and is equal to or higher than a surface potential of the photosensitive drum during the reverse rotation of the motor.
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