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:
Feb. 19, 2019
Filed:
Sep. 06, 2017
Yuuki Tsuchiya, Tokyo, JP;
Masayuki Yamane, Kanagawa, JP;
Keiichi Yoshida, Kanagawa, JP;
Atsushi Kurokawa, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
Tatsuya Ohhira, Kanagawa, JP;
Yuuki Tsuchiya, Tokyo, JP;
Masayuki Yamane, Kanagawa, JP;
Keiichi Yoshida, Kanagawa, JP;
Atsushi Kurokawa, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
Tatsuya Ohhira, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A developing device includes a casing to contain developer, a developer bearer, an upper and lower developer conveyors to convey the developer to one side in an axial direction of rotation shafts thereof, a communicating portion disposed on a first end side on which an input gear is disposed, to fall the developer from the upper developer conveyor to the lower developer conveyor, bearings to receive end portions the upper and lower developer conveyors, and first and second end seals to seal gaps in the bearings on the upper and lower developer conveyors, respectively. The first end seals and the second end are disposed on the first end side and a second end side, respectively. A sliding friction between the rotation shaft and at least one of the first end seals is smaller than a sliding friction between the rotation shaft and the second end seal.