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. 11, 1978
Filed:
Sep. 20, 1976
Nelson Kay Arter, Longmont, CO (US);
Clarence Howard Hammond, Longmont, CO (US);
Daniel James Pedersen, Longmont, CO (US);
Marvin Edward Prahl, Longmont, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
During a search operation in a rotating magnetic head tape transport, the tape is transported from a supply spool via guides and a vacuum column past the rotating head read/write station to a take-up spool. As the tape is wound onto the take-up spool in layer-by-layer convolutions, air is entrapped between the layers. The entrapped air forms a layer of air film and as a result the tape is loosely wound on the take-up spool. A 'Hard Step' voltage is generated and is applied to the capstan motor at the end of the search operation to tighten any loose wraps caused by the air entrapment during the search.