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:
Jun. 19, 2012
Filed:
Jan. 12, 2009
Shinya Karasawa, Kawasaki, JP;
Takatsugu Fujishiro, Tokyo, JP;
Takaaki Tawada, Yokohama, JP;
Hiromichi Ninomiya, Yokohama, JP;
Takeshi Tabuchi, Sagamihara, JP;
Naohiro Kumagai, Machida, JP;
Akira Fujimori, Fujisawa, JP;
Shinya Karasawa, Kawasaki, JP;
Takatsugu Fujishiro, Tokyo, JP;
Takaaki Tawada, Yokohama, JP;
Hiromichi Ninomiya, Yokohama, JP;
Takeshi Tabuchi, Sagamihara, JP;
Naohiro Kumagai, Machida, JP;
Akira Fujimori, Fujisawa, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A charging device includes a charging roller, a drive transmission device, and a charging roller cleaner. The charging roller opposes an image carrier driven to rotate and rotates to charge the image carrier. The charging roller cleaner contacts the charging roller to clean the charging roller. The drive transmission device transmits torque from the image carrier to the charging roller, and includes an image carrier gear and a driven gear. The image carrier gear and the driven gear form a gear train to drive the charging roller in response to rotation of the image carrier. The charging roller cleaner is disposed facing a rear surface of the charging roller to prevent displacement of the charging roller due to a force generated by a pressure angle formed between the image carrier gear and the driven gear when the charging roller rotates in response to rotation of the image carrier.