Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1983-04-11
1985-07-23
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 742, 242186, 318 7, G11B 1554, G11B 1920
Patent
active
045311668
ABSTRACT:
An improved drive for a magnetic data storage tape is described which features direct coupling of the tape from a machine to a file reel without interposition of vacuum buffers or spring loaded tension control devices. Control of the current supplied to motors driving the file and machine reels is performed by a microprocessor in response to information derived during an initialization routine performed at first mounting of a reel of tape upon the drive and in response to continuously generated velocity information generated by tachometers on the motor shaft. The absolute position of the tape can at all times be known to the microprocessor and the tension of the tape can be controlled by control of the supply of current to the motors. In a preferred embodiment, a solid state buffer memory is provided to accept data from a host computer during the time the tape drive comes up to speed. By use of the initialization routine to determine motor losses, windage, brush and bearing wear, and the moment of inertia of the motor/reel systems, and the instantaneous tachometer data, direct sensing of tape tension can be avoided, thus eliminating mechanical parts in favor of sophisticated electronic control means.
REFERENCES:
patent: 3809335 (1974-05-01), Mantey
patent: 3910527 (1975-10-01), Buhler et al.
patent: 3982160 (1976-09-01), Goldschmidt et al.
patent: 4156257 (1979-05-01), Roberts
patent: 4232371 (1980-11-01), Kamoto
patent: 4278213 (1981-07-01), Rubruck
Storage Technology Corporation
Wolff John H.
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