Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Patent
1974-07-01
1976-06-29
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
1375253, 13754315, 13753311, G11B 1558, G11B 1548
Patent
active
039673197
ABSTRACT:
This abstract describes apparatus for improving the operation of magnetic tape decks which have two parallel wall vacuum columns and two tapered wall vacuum columns, in which means are provided to minimize the tape excursion in the tapered columns. Because of the small mass of the tape in the tapered colUmns, the tape can accelerate very rapidly, and when doing so may cause a reversal of air flow from the vacuum columns acting like an air pump, for example, when the tape is moving outwardly. In the tapered column, with wide excursiOns of the tape, there is danger of flutter and oscillation when the tape force varies in a pulsating manner and a resonance can be set up. A check valve is applied between the tapered vacuum column and the vacuum plenum, so that when there is an outward excursion of the tape the check valve will close and there will be an increasing vacuum in the column. This will provide a greater force restricting outward movement of the tape.
REFERENCES:
patent: 2451626 (1948-10-01), Marshall, Jr.
patent: 3170045 (1965-02-01), Baumeister et al.
patent: 3286728 (1966-11-01), Stephenson
patent: 3289693 (1966-12-01), Scaramucci
patent: 3766940 (1973-10-01), Mason
Eddleman Alfred H.
Telex Computer Products, Inc.
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