Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1976-09-20
1978-04-11
Schaefer, Robert K.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318603, G05B 1928
Patent
active
040841162
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.
REFERENCES:
patent: 3730450 (1973-05-01), Hank
patent: 3809335 (1974-05-01), Martey
patent: 4030131 (1977-06-01), Beiter et al.
Arter Nelson Kay
Hammond Clarence Howard
Pedersen Daniel James
Prahl Marvin Edward
Cockburn Joscelyn G.
Feldhaus John J.
International Business Machines - Corporation
Schaefer Robert K.
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