Apparatus for controlling and stopping a transport mechanism at

Details Apparatus for controlling and stopping a transport mechanism at Apparatus for controlling and stopping a transport mechanism at

1979-05-09

1981-05-12

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 73, 360 741, G11B 1548, G11B 1906

Patent

active

042675642

ABSTRACT:
Apparatus is disclosed for issuing commands for controlling the operation of a transport mechanism preferably of the type which transports a recording medium such as a magnetic tape for the purpose of stopping at a predetermined cue point location on the medium. The apparatus includes a counter which accumulates tachometer pulses that are generated by movement of the medium so that the instantaneous count of the counter always provides an indication of the distance from the cue point location. Division rate outputs of the tachometer rate are provided by the counter and means responsive to various predetermined counts selects one of the division rate outputs for application to an error detector which measures the period of the division rate signal and provides an overspeed indication when the period exceeds a predetermined value. The determination of an overspeed condition results in a deceleration command signal being generated. As the medium approaches the cue point location, various predetermined counts effectively cause different division rate signals to be applied to the error detector so that the velocity of the medium is reduced in stepped increments as the cue point location is approached.

REFERENCES:
patent: 3641504 (1972-02-01), Sidline
patent: 3812532 (1974-05-01), Crosser et al.
patent: 4062048 (1977-12-01), Weber
patent: 4095732 (1978-06-01), Merritt
patent: 4172231 (1979-10-01), d'Alayer de Costemore d'Arc

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