Speed detector for sewing machines

Details Speed detector for sewing machines Speed detector for sewing machines

1981-07-30

1984-03-13

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

310156, G01R 104

Patent

active

044370610

ABSTRACT:
A speed detector comprises a rotary shaft for rotation with a sewing machine, a ring-shaped permanent magnet uniformly magnetized in a direction parallel to the axis of the rotary shaft, at least one ring-shaped, internally toothed ferromagnetic member or stator and an externally toothed ferromagnetic circular member or rotor which is secured to the rotary shaft inside the stator to form a varying air gap between the opposing teeth. The permanent magnet and the two ferromagnetic members are disposed to form a closed loop magnetic circuit in which a ring-shaped coil is disposed. The air gap and hence the reluctance of the magnetic circuit changes periodically with the revolution of the rotary shaft so that a voltage is generated in the coil which varies at a frequency proportional to the operational speed of the sewing machine.

REFERENCES:
patent: 3970935 (1976-07-01), Beery
Darling; "Magnetic Pulse Emitter"-IBM Tech. Disclosure Bulletin-Mar. 1969-p. 1362.

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