Electric sewing machine driving apparatus

Details Electric sewing machine driving apparatus Electric sewing machine driving apparatus

1981-07-21

1983-09-13

Nerbun, Peter P.

Sewing

Elements

Starting or stopping

D05B 6922

Patent

active

044035632

ABSTRACT:
An electric sewing machine driving apparatus includes a clutch coil of an electromagnetic clutch for transmitting a driving motor torque to a sewing machine, a brake coil of an electromagnetic brake for braking the sewing machine, a needle position signal generator for generating a signal indicative of a position where a needle of the sewing machine is to stop, a DC power supply for energizing the clutch coil and the brake coil, voltage generating means for generating a DC voltage higher than the supply voltage of the DC power supply and a capacitor disposed to be charged by the voltage generated by the voltage generating means, whereby an electric charge stored in the capacitor discharges through the brake coil in response to the needle position signal from the needle position signal generator, thereby improving the needle positioning accuracy of the sewing machine.

REFERENCES:
patent: 4161921 (1979-07-01), Nishida et al.
patent: 4195582 (1980-04-01), Novick
patent: 4351254 (1982-09-01), Brown

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