The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2007
Filed:
Dec. 01, 2004
Toshiki Takiguchi, Yamatokoriyama, JP;
Hiroshi Tachiki, Yamatokoriyama, JP;
Hirokazu Yamauchi, Uji, JP;
Hiroyuki Murai, Gose, JP;
Yoshiaki Masuda, Nara, JP;
Fumio Shimazu, Nara, JP;
Masashi Hirai, Katano, JP;
Toshiki Takiguchi, Yamatokoriyama, JP;
Hiroshi Tachiki, Yamatokoriyama, JP;
Hirokazu Yamauchi, Uji, JP;
Hiroyuki Murai, Gose, JP;
Yoshiaki Masuda, Nara, JP;
Fumio Shimazu, Nara, JP;
Masashi Hirai, Katano, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A timer clocks and accumulates time periods during each of which a recording sheet is transported or transfer bias is applied as transfer execution periods. When the accumulated value reaches a predetermined value, the timer outputs a time-up signal to a CPU and then clears the accumulated value. The CPU executes a cleaning operation at the time the time-up signal is inputted from the timer. In the cleaning operation, the CPU causes a high-voltage power source to apply cleaning bias to a transfer electrode roller while causing a high-voltage power source to apply delivery bias to an auxiliary cleaning roller, in order to return toner attracted to the auxiliary cleaning roller to a photosensitive drum via a transfer belt.