Method and apparatus for detecting skipped stitches for a lockst

Details Method and apparatus for detecting skipped stitches for a lockst Method and apparatus for detecting skipped stitches for a lockst

1990-07-05

1991-12-03

Nerbun, Peter

Sewing

Elements

Thread sensing

D05B 6936

Patent

active

050691511

ABSTRACT:
The invention is a method and apparatus for detecting a skipped stitch for a Class 301 lockstitch sewing machine. A monitor assembly determines the passage of the needle thread about the bobbin assembly during formation of lockstitches. A second monitor assembly determines the reciprocal movement of the needle by detecting rotation of a shaft which drives the needle. A processor identifies times when the rotational movement of the shaft does not correlate with passage of the needle thread about the bobbin assembly.

REFERENCES:
patent: 3785308 (1974-01-01), Brandriff et al.
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patent: 4558654 (1985-12-01), Schilling et al.
patent: 4602582 (1986-07-01), Rawson
patent: 4934292 (1990-06-01), Mardix et al.
patent: 4938159 (1990-07-01), Shibata

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