Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1993-12-22
1995-04-25
Ro, Bentsu
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318 7, B65H 7700
Patent
active
054102243
ABSTRACT:
A magnetic tape transport having a pair of reel motors for bidirectionally driving a tape between a pair of reels within a cassette housing, and a pair of tension control transistors for controllably varying supply voltages across the respective reel motors. For holding the tape under tension when it is at rest, against the possibility of tape displacement regardless of varying tape roll diameters on both reels, the output pulses of a tape speed sensor are directed through a bidirectional counter into a digital to analog converter, so that the latter provides a voltage output that varies linearly in magnitude as the tape travels from one extremity toward the other. This variable voltage output from the converter is applied through a tension control circuit to the pair of tension control transistors whenever the tape is stopped. Standstill tape tension is thus controlled by varying the voltages impressed to both reel motors according to the current ratio of tape roll diameters on both reels.
REFERENCES:
patent: 4015799 (1977-04-01), Koski et al.
patent: 4072883 (1978-02-01), Beiter
patent: 4163532 (1979-08-01), Sakai
patent: 4448368 (1984-05-01), Skalko
patent: 4522351 (1985-06-01), Yessian et al.
patent: 4788558 (1988-11-01), Caldwell et al.
Ro Bentsu
Teac Corporation
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