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:
Apr. 20, 1993
Filed:
May. 06, 1991
Yasuhiro Sawada, Chofu, JP;
Yusaku Azuma, Yokohama, JP;
Takeo Tanita, Yokohama, JP;
Yasuo Karube, Inashiki, JP;
Teiji Ohsaka, Ushiku, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A planetary roller speed reducer includes a sun roller mounted rotatably on a pedestal and a plurality of planetary rollers having a central portion with a narrowed diameter and mounted rotatably on the pedestal. The sun roller circumscribes large-diameter portions of the planetary rollers which work as a first reduction part, and an outer ring working as an output shaft circumscribes a small-diameter portion working as a second reduction part. A rotary driving system comprises a support fixed to the pedestal and disposed within the outer ring on an extension of the sun roller, and a turning angle detector fixed to the outer ring detects a turning angle between the support and the outer ring.