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:
Oct. 14, 2003
Filed:
Sep. 18, 2001
Kenichi Ushikoshi, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A gear train has a sun gear with a tooth count e, n (where n is a natural number of 2 or more) planetary gears having a first gear part with a tooth count z meshing with the sun gear and a second gear part with a tooth count z , a fixed internal tooth gear with a tooth count I meshing with the first gear part of the planetary gears, and a movable internal tooth gear with a tooth count I meshing with the second gear part of the planetary gears, where tooth counts e, z , z , I and I are each a multiple of n. Even if the gear form of each gear has a small module, a planetary gear train mechanism can be configured without raising operating or assembly problems, and it can be miniaturized more than conventional gear trains while still have a sufficient gear reduction ratio.