Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1978-02-03
1980-09-23
Hecker, Stuart N.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 10, 360 70, G11B 1546
Patent
active
042246458
ABSTRACT:
A recording medium transport control precisely controls the movement of a recording medium such as magnetic tape at a desired velocity. A pulse drive control adapted for manipulation provides drive pulses to the transport. Each drive pulse is of a variable duration sufficient to drive the transport so that the medium is moved a predetermined distance. One embodiment of the present invention includes a velocity servo drive control, also adapted for manipulation, for providing an adjustable continuous drive signal to the transport and a switch for switching control of the transport from the pulse drive control to the velocity servo drive control when the velocity of the transport reaches a predetermined cross-over velocity.
REFERENCES:
patent: 3639688 (1972-02-01), Nelson
patent: 3699247 (1972-10-01), Moshima
patent: 3900890 (1975-08-01), Eibner
patent: 3913134 (1975-10-01), Sargunar
patent: 3921132 (1975-11-01), Baldwin
patent: 3931639 (1976-01-01), Arter
patent: 3943562 (1976-03-01), Opelt
patent: 4044389 (1977-08-01), Oldershaw
Ampex Corporation
Clay Robert G.
Faber Alan
Hecker Stuart N.
Mossino Ralph L.
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