Apparatus and method for tape velocity and tension control in a capstanless magnetic tape transport
US5012989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Nov 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/43
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a capstanless tape transport, practice of the invention provides substantially constant tape tension when tape is spooled from a supply reel to a take up reel over the tape's entire length, for either direction of tape travel. The tape velocity is maintained constant by a closed loop velocity servo controlling the current applied to one of the reeling motors, and the tape tension is maintained substantially uniform by applying a current derived in an open loop manner to the other motor, such that the sum of the currents to the two reeling motors equals a constant. The invention may be implemented either utilizing analog control or digital control of the reeling apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.