Speed setting arrangement for sewing machines

Details Speed setting arrangement for sewing machines Speed setting arrangement for sewing machines

1985-01-31

1986-03-25

Miska, Vit W.

Electricity: motive power systems

Motor-reversing

Field circuit control

318139, 318342, 318348, 318439, 112277, 338 12, 338 32R, H02K 122

Patent

active

045786240

ABSTRACT:
A speed setting arrangement for a sewing machine comprises a permanent magnet mounted for unitary rotation with the foot pedal of the sewing machine, and a magnetic sensor including a plurality of magnetoresistors arranged in pairs to form a bridge circuit on a stationary plane spaced a distance from the plane of rotation of the magnet. The magnetic sensor provides an output signal which is exclusively a function of the magnetic orientation of the magnet and thus serves as a valid indication of the amount of pedal depression. An analog to digital converter is coupled to the magnetic sensor to convert its output into a digital signal for speed control purposes.

REFERENCES:
patent: 3419731 (1968-12-01), Wheable et al.
patent: 3988710 (1976-10-01), Sidor et al.
patent: 4132970 (1979-01-01), Masuda et al.
patent: 4499449 (1985-02-01), Shinozaki et al.

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