Method and apparatus for detecting an aberrational stitch in rea

Details Method and apparatus for detecting an aberrational stitch in rea Method and apparatus for detecting an aberrational stitch in rea

1995-09-22

1997-03-04

Nerbun, Peter

Sewing

Elements

Starting or stopping

11247501, D05B 6936

Patent

active

056069260

ABSTRACT:
A method and apparatus for detecting an aberrational stitch, normally a skipped stitch, in real time in a sewing apparatus. Movement of thread is detected, and a signal is generated if the thread is moving. At the same time, revolution of the handwheel of the sewing machine is detected, and pulses representative of the revolution are generated. The pulses are accumulated so long as the thread is moving, and the accumulated pulses are compared with a minimum number of pulses for a period of time. After one revolution of the sewing machine handwheel, representative of one stitch, the results of the comparisons are used to determine an aberrational stitch, and if a malformed stitch is detected., the sewing apparatus is stopped.

REFERENCES:
patent: 3843883 (1974-10-01), DeVita et al.
patent: 4426948 (1984-01-01), Olasz et al.
patent: 4691648 (1987-09-01), Hirose
patent: 4993337 (1991-02-01), Matsubara
patent: 5018465 (1991-05-01), Hager et al.

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