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:
Jul. 06, 1976
Filed:
Aug. 14, 1975
Ernst P Hess, Castro Valley, CA (US);
Qume Corporation, Hayward, CA (US);
Abstract
Apparatus for driving a cartridge mounted rotatable ribbon capstan and take-up reel. A magnetic clutch assembly has a first gear driven by a motor for directly driving the capstan and a second gear magnetically driven by the first gear for driving the take-up reel through a gear train. The magnetic clutch assembly includes a magnetic drive ring secured to the first gear and having a plurality of inner peripheral teeth, a pair of annular magnetic members mechanically linked to the second gear, an annular magnet disposed between the magnetic members and a magnetic washer disposed below the lower magnetic member. The magnetic clutch assembly provides a yieldable driving force to the take-up reel which releases when the tension in the ribbon between the capstan and the take-up reel exceeds a predetermined threshold value. This threshold value may be adjusted by varying the dimension of the magnetic washer or the air gap between the drive ring and the annular magnetic members.