Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1981-05-01
1983-12-27
Truhe, J. V.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
310 92, 310118, 318 9, 318491, B65H 5938
Patent
active
044233590
ABSTRACT:
An electric motor for a magnetic tape recorder comprises an electrically insulating disk-shaped stator with a plurality of flatwise coils, a rotary shaft rotatably extending through the stator, and a first disk-shaped rotor of soft iron with a multi-pole annular magnet and a second disk-shaped rotor of soft iron rotatably extending through the shaft on both sides of the stator. A pulley is fixed on the shaft below the first rotor to drive capstans, and a reel disc or a pinion is coaxially connected to the second rotor to drive a take-up reel for forward play. In a fast forward feed mode, the first and second rotors can be mechanically interlinked. Alternatively, an electromagnetic solenoid may be used to take out a torque from the first rotor by engaging an idle roller with a roller fixed to the rotary a shaft above the pinion or to apply a pressure to the second rotor to increase the friction between the second rotor and an adjacent shoulder on the shaft.
REFERENCES:
patent: 4007390 (1977-02-01), Muller et al.
patent: 4181867 (1980-01-01), Muller
Evans A.
Mitsubishi Denki & Kabushiki Kaisha
Truhe J. V.
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