Driving device for a sewing machine

Details Driving device for a sewing machine Driving device for a sewing machine

1991-09-24

1993-12-21

Nerbun, Peter

Sewing

Elements

Driving mechanisms

112277, D05B 6912

Patent

active

052713466

ABSTRACT:
In a sewing machine, a judgment is made whether a needle speed is above or below a threshold speed. When the needle speed is above the threshold speed, meaning the machine is sewing normally, a constant power is supplied at a level associated with a foot pedal setting. When the needle speed drops below the threshold, the power is alternated between power on and power off states to drive the needle in a manner similar to a hammer driving a nail. The indication of needle speed may be obtained by measuring the rotating speed of the sewing machine motor, judging the load applied to sewing machine motor, or by detecting the driving current supplied to the sewing machine motor.

REFERENCES:
patent: 4364001 (1982-12-01), Heidt et al.
patent: 4490656 (1984-12-01), Arnold
patent: 4541349 (1985-09-01), Inoue
patent: 4883008 (1989-11-01), Hiramatsu
patent: 5018466 (1991-05-01), Hasegawa

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