Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1983-09-06
1986-12-23
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 78, G11B 558, G11B 2108
Patent
active
046316116
ABSTRACT:
The present invention employs, in a preferred embodiment, a pair of pulleys, one of which is fixed and the other of which is movable and each of which has substantially the same diameter. The pulleys each have an axial aperture which holds a bearing arrangement including a shaft. Mounted across the two shafts is a pair of plates which are interconnected and therefore act together as a rigid body. The rigid body, or rigid member, is movable in a rotary fashion. In addition, there is a flexible band member which loops a substantial section of the movable pulley and, in a preferred embodiment, is disposed to come in frictional contact with the movable pulley and the fixed pulley. The ends of the band are secured to the fixed pulley and are held in tension. Accordingly, as the plates (the rigid body) are moved in a rotary fashion around the center of the fixed pulley, the movable pulley is moved, relative to its associated shaft, in a counter direction in response to the friction force between the band and the movable pulley. Hence, in the preferred embodiment, the movable pulley effects a curvilinear translation. A read/write head assembly is secured to the movable pulley and in response to the curvilinear translation, the read/write head assembly is moved radially across a plurality of tracks of a magnetic disk. In this way, the change in yaw, or skew, between the read/write head and the tracks on the magnetic disk is held to a minimum.
REFERENCES:
patent: 3867762 (1975-02-01), Koenuma
patent: 4221056 (1980-09-01), Hirano
patent: 4310863 (1982-01-01), Kohl et al.
patent: 4399477 (1983-08-01), Bryer
patent: 4419707 (1983-12-01), Woodier
Wheeler, "Tensioning System to a Band Access Mechanism", Dec. 1974, IBM TDB, vol. 17, No. 7, pp. 2088-2089.
Cleaver William E.
Digital Equipment Corporation
Severin David J.
Wolff John H.
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