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:
Aug. 17, 1999
Filed:
Apr. 06, 1998
Mark A Gould, Ipswich, MA (US);
Robert G Berry, Danvers, MA (US);
Teijin Seiki Boston, Inc, Peabody, MA (US);
Abstract
A phasing differential gear assembly is arranged in a housing, for the speed adjustment of an output shaft which shaft may be utilized to control tension in a web on a drum being driven by the output shaft. A driven input shaft having a second end imparts a first rotational speed to a co-axially arranged first end of the output shaft. A first external toothed gear is arranged on the first end of the input shaft, and a second external gear is disposed between the second end of the input shaft and the first end of the output shaft. A third external toothed gear is disposed on the first end of the output shaft. A first flexible gear is arranged radially outwardly of the first and second external gears, and a second flexible gear is arranged radially outwardly of the second and third external gears. A first wave generator is arranged radially outwardly of the first flexible gear, and a second wave generator is arranged radially outwardly of the second flexible gear. The input shaft and the output shaft are arranged to rotate at a common speed through a coupling of the second external gear and first and second flexible gears. The first wave generator is actuatable to vary the output speed of the output shaft from the input speed of the input shaft.