APPARATUS FOR DETECTING SKIPPED STITCHES

摘要

Apparatus for detecting skipped stitches for sewing machines having a bobbin-type assembly using a thread movement sensor for continuous monitoring of the presence of a needle thread in a beam path. Needle thread movement is correlated with needle shaft rotation per stitch cycle to detect instances when there is no thread movement during a stitch cycle. The apparatus may also include a bobbin thread monitor system to detect residual bobbin thread.