Image forming apparatus with transfer bias inverting function
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United States of America Patent
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Dec 7, 2004
Grant Date -
Mar 18, 2004
app pub date -
May 30, 2003
filing date -
Sep 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.
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