Sewing – Elements – Thread sensing
Patent
1990-09-07
1992-08-25
Nerbun, Peter
Sewing
Elements
Thread sensing
D05B 6936
Patent
active
051409208
ABSTRACT:
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.
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Arauo Richard K.
Bellio Stephen L.
Nerbun Peter
The Charles Stark Draper Laboratory Inc.
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