Sewing machine individually driving needle bar and looper

Details Sewing machine individually driving needle bar and looper Sewing machine individually driving needle bar and looper

1990-11-07

1992-02-18

Nerbun, Peter

Sewing

Elements

Starting or stopping

112220, 112221, D05B 6910

Patent

active

050884298

ABSTRACT:
A sewing machine having separate drives for the needle bar and looper includes initialization routines to place the needle bar and looper in predetermined starting positions prior to the start of a sewing operation. Position detectors comprise photoelectric cells and interrupters mounted on the motor shafts of the needle bar drive motor and the looper drive motor. The position of the needle bar is initialized first, by movement in a reverse direction, if necessary, to prevent undesired engagement with the looper. Thereafter, the looper position is initialized. A sewing operation is enabled once the needle bar and looper are set in predetermined starting position.

REFERENCES:
patent: 3425376 (1969-02-01), Brynge et al.
patent: 3875489 (1975-04-01), Von Brimer
patent: 4620497 (1986-11-01), Sano
patent: 4690081 (1987-09-01), Castagna et al.

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