Method and apparatus for detecting improper stitches for a chain

Details Method and apparatus for detecting improper stitches for a chain Method and apparatus for detecting improper stitches for a chain

1989-03-31

1991-02-12

Nerbun, Peter

Sewing

Elements

Thread sensing

112197, 1122621, D05B 6936

Patent

active

049915282

ABSTRACT:
A method and apparatus for detecting an improper stitch for a Class 400 chainstitch sewing machine. A monitor assembly determines the consumption per stitch of the looper thread during the formation of the chainstitches. A processor identifies times when the monitored consumption is indicative of looper thread consumption per stitch below a predetermined threshold value. Since the consumption per stitch for looper thread is nominally a predetermined multiple of the stitch length, those identified times correspond to times when improper stitches have occurred.

REFERENCES:
patent: 3785308 (1974-01-01), Brandriff et al.
patent: 3843883 (1974-10-01), De Vita et al.
patent: 4102283 (1978-07-01), Rockerath et al.
patent: 4186672 (1980-02-01), Burton
patent: 4192243 (1980-03-01), Blessing et al.
patent: 4196685 (1980-04-01), Tamura
patent: 4602582 (1986-07-01), Rawson

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