Sewing machine drive device

Details Sewing machine drive device Sewing machine drive device

1986-07-21

1988-08-23

Nerbun, Peter

Sewing

Elements

Starting or stopping

D05B 6922

Patent

active

047652675

ABSTRACT:
This invention relates to sewing machine drive devices, and more particularly to a sewing machine drive device which, in order to stop the sewing needle at a desired position, drives the sewing machine at an ultra low speed and changes the speed of the sewing machine to a desired value immediately before the needle is stopped. The device comprising a sewing machine drive mechanism having an induction motor (14) and a braking unit (18), and a position detector (24) coupled to the output side of the induction motor, for detecting a sewing needle's position, the induction motor being subjected to variable speed driving by a motor speed control circuit (32) including an inverter circuit, and the braking unit (18) being operated with the aid of a detection signal from the position detector (24).

REFERENCES:
patent: 4195582 (1980-04-01), Novick
patent: 4530297 (1985-07-01), Fujikawa
VS-610 Thyristor Inverter Drive, Yoshida, Iwakane, and Kume, Yasukawa Denki, 36, No. 138 (No. 2, 1972), (pp. 165-183).

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