Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1996-01-19
1998-04-07
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 555, G11B 2108
Patent
active
057371539
ABSTRACT:
A positioning mechanism positions a transducer along a linear axis relative to a support structure and includes a movable mount for the transducer, a rotatable cam element with camming structure that is maintained in contact with the movable mount and a rotatable drive to rotate the cam element. The cam element is preferably a wheel with angularly spaced openings with spherical balls of different diameters disposed in respective ones of the openings to define the camming structure. Alternatively, the camming structure may be a continuous or a stepped annular ramp around the surface of a disc-shaped member. The movable mount is a shaft and a shuttle that support the transducer with the shaft slideably received between two opposed pieces of a yoke-shaped support arm. The shaft is spring biased against the cam element. The drive is a servo motor, a stepper motor or a solenoid, and an encoder operates to sense the rotational orientation of the cam element.
REFERENCES:
patent: 3370131 (1968-02-01), Reed
patent: 3705270 (1972-12-01), Huber
patent: 3839737 (1974-10-01), Vogel
Henson Michael R.
Martin Timothy J.
Tupper Robert S.
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