Sewing – Elements – Starting or stopping
Patent
1991-09-13
1993-08-10
Crowder, Clifford D.
Sewing
Elements
Starting or stopping
112278, 112197, D05B 6936
Patent
active
052339360
ABSTRACT:
Apparatus and method for detecting skipped stitches for chainstitch sewing machines having a looper assembly using a needle thread movement sensor and/or a looper thread movement sensor in combination with a shaft rotation sensor. Needle thread movement is correlated with needle shaft rotation per stitch cycle to detect instances when there is no needle thread movement during a stitch cycle. Similarly, looper thread movement may be correlated with needle shaft rotation per stitch cycle to detect instances when there is no looper thread movement during a stitch cycle. The invention includes methods for detecting needle loop and triangle skips by detecting instances of substantially no needle thread or looper thread movement during certain respective portions of the stitch cycle.
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Crowder Clifford D.
Izaguirre Ismael
The Charles Stark Draper Laboratory Inc.
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