Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – With particular drive
Patent
1992-07-01
1995-04-04
Stodola, Daniel P.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
With particular drive
226 44, 226111, G11B 1528
Patent
active
054029562
ABSTRACT:
In a capstan driven tape transport, placing the tape into a "zero" tension condition before it engages the first of two tape speed metering capstans of the transport. "Zero" tape tension is a negligible tension relative to the tape tensions normally present in the drive, and substantially approaches a value of zero tension. "Zero" tape tension is attained by the tape passing from the tape supply over an auxiliary capstan located upstream from the first tape speed metering capstan, and the tape segment emerging from the auxiliary capstan is configured to hang in a very loose loop. The loop is maintained at "zero" tension by sensing the loop position either by a slight pressure differential in a vacuum column or by a very light arm resting on the loop, and the sense signal is used to servo the speed of the auxiliary capstan to maintain "zero" tension in the loop. The zero tension tape segment sequentially engages the first of two speed metering capstans, the recorder's record/playback heads and then a second tape speed metering capstan before being wound onto a takeup spool. The invention is applicable to a linear tape motion transport or to a helical scan transport, and in a less sophisticated version is applicable to a simplified two capstan helical scan transport.
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"Magnetic Recording Handbook", Editors: Mee & Daniel, McGraw Hill Pub. Co., 1990; pp. 1107-1112.
Darling John P.
Stodola Daniel P.
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