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:
Mar. 30, 2004
Filed:
Sep. 04, 2002
James Mitchell Karp, Tucson, AZ (US);
John Alexander Koski, Livermore, CA (US);
Steven Carter Wills, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Dynamic tension control for tape transported along a tape path between supply and take-up reels, driven by supply and take-up reel motors. Rotational angular velocities of the supply and take-up reels are determined from tachometers, and therefrom a linear speed for the tape at the supply reel, and a linear speed for the tape at the take-up reel are each determined. The tape linear speeds at the reels are compared to determine a delta velocity between the linear speeds. The motors are operated in accordance with a function of the delta velocity to provide a torque to at least one of the reels tending to reduce the delta velocity.