Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1985-02-07
1987-06-30
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 97, 360 71, G11B 1700, G11B 5012
Patent
active
046775102
ABSTRACT:
An apparatus for data transfer with a magnetic disk having a metal made hub attached centrally thereto, with the hub having a first opening defined centrally therein and a second opening defined eccentrically therein. The apparatus includes a turntable mounted on a drive spindle which is engageable in the first opening in the hub of the magnetic disk loaded on the turntable. A retractable drive pin is mounted eccentrically on the turntable so as to be sprung into engagement in the second opening in the disk hub upon register therewith. In order to assure engagement of the drive pin in the second opening in the disk hub immediately upon loading of the magnetic disk on the turntable, a disk drive motor for driving the turntable via the drive spindle is connected to a supply terminal via a power control switch. When the magnetic disk is loaded on the turntable while power is being supplied from the supply terminal, a switch control circuit closes the power control switch, for causing the rotation of the turntable relative to the magnetic disk, for a preassigned length of time sufficient for the drive pin to become engaged in the second opening in the disk hub. The magnetic disk can therefore be set into rotation for immediate commencement of data transfer upon delivery of a "motor on" signal from host equipment to the power control switch.
REFERENCES:
patent: 4376293 (1983-03-01), Teramura et al.
patent: 4445155 (1984-04-01), Takahashi et al.
patent: 4547820 (1985-10-01), Saito
Hiraki Kazuhiro
Morita Tsutomu
Shoji Makoto
Toma Shozo
Tsuyuguchi Hiroshi
Busson Matthew J.
Teac Corporation
Wolff John H.
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