Electrophotography – Internal machine environment – Particle or contaminant control
Reexamination Certificate
2011-07-12
2011-07-12
Royer, William J (Department: 2852)
Electrophotography
Internal machine environment
Particle or contaminant control
C399S129000
Reexamination Certificate
active
07978998
ABSTRACT:
There is a charge member which charges secondary transfer remaining toner on an intermediate transfer member to a polarity opposite to a normal charge polarity. The transfer remaining toner charged by the charge member is moved in the direction opposite to that of normal toner by a transfer bias and moved from the intermediate transfer member onto an image bearing member. A BK station is arranged on the downstream of other stations. In a continuous BK monochromatic mode, by applying a reverse bias to transfer portions of the other stations and applying the transfer bias only to the BK station, waste toner can be collected into the BK station (simultaneously with the transfer). In a full-color mode, since each transfer bias is applied to all stations, the waste toner is collected into the station on the uppermost stream. Thus, the image bearing member for collecting the transfer remaining toner on the intermediate transfer member is made different according to the mode, thereby suppressing that the collection of the waste toner is concentrated on one image bearing member.
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Chinese Office Action dated May 15, 2009 in Chinese Application No. 200810004841.4, and an English-language translation therefor.
Akizuki Tomoo
Kanari Kenji
Nakagawa Ken
Shimada Takashi
Shimura Masaru
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Royer William J
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