Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1976-04-28
1977-04-12
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360104, G11B 2122, G11B 554, G11B 548
Patent
active
040178986
ABSTRACT:
The apparatus includes a transducer carrying frame having a spine and arms extending from the spine. A transducer is mounted at the foot of the spine and two sled bearings are mounted at the outer ends of the arms, to form a sled assembly which can slide over the recording surface of a magnetic recording disc with the contact face of the transducer and the bearing faces of the sled bearings contacting the recording surface. The sled assembly is attached to the outer, non-supported end of a cantilever leaf spring. When this cantilever leaf spring is undeflected it holds the sled assembly near the recording surface of the recording disc but out of contact with it. A presser foot is provided to press upon the sled assembly and thus deflect the first cantilever leaf spring and bring the sled assembly into recording and reproducing contact with the recording surface of the recording disc. The presser foot is mounted on a second cantilever leaf spring. A third cantilever leaf spring deflects the second cantilever leaf spring and urges the presser foot against a presser foot bearing mounted on the sled assembly, thus causing the transducer and the sled bearings to remain in contact with the recording surface of the recording disc. A lifting bar is provided which can forceably deflect the second cantilever leaf spring against the urging of the third cantilever leaf spring, thus withdrawing the presser foot from the sled assembly and allowing the first cantilever leaf spring to return to its undeflected position and withdraw the sled assembly from the recording surface of the disc. For recording or reproducing information on the recording surface, the lifting bar is withdrawn and the second cantilever leaf spring is deflected by the third cantilever leaf spring, thus depositing the sled assembly on the recording surface and very lightly pressing the sled assembly against the recording surface, the total head pressure against the disc being as little as 1.5 grams.
REFERENCES:
patent: 3349384 (1967-10-01), Kohn
patent: 3368210 (1968-02-01), Zimmer
patent: 3637928 (1972-01-01), Poulett
Sullivan Royce R.
Toombs Harold G.
Redlake Corporation
Tupper Robert S.
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