Needle thread stitch formation monitor

Details Needle thread stitch formation monitor Needle thread stitch formation monitor

1994-02-17

1995-01-24

Crowder, Clifford D.

Sewing

Elements

Thread sensing

D05B 5100

Patent

active

053834178

ABSTRACT:
This invention relates to a method and apparatus for instantaneously monitoring the presence of properly and improperly formed needle thread stitches for all sewing machines with one or more needles at all operating speeds. An electronic control circuit connected to a high-speed synchronizer sensor and a high-speed thread sensor is provided which yields an instantaneous output of a desired duration when improper stitch formation occurs. The output from the electronic control circuit may be used to alert sewing machine operators in various ways of defective needle thread stitches.

REFERENCES:
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patent: 3587497 (1971-06-01), Beazley
patent: 4102283 (1978-07-01), Rockerath et al.
patent: 4426948 (1984-01-01), Olasz et al.
patent: 4438718 (1984-03-01), Hanyu
patent: 4602582 (1986-07-01), Rawson
patent: 4735161 (1988-04-01), Brocklehurst
patent: 4754722 (1988-07-01), Rohr et al.
patent: 4841890 (1989-06-01), Tancs
patent: 4939159 (1990-07-01), Shibata

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