Process and device for recognizing missed stitches during the op

Details Process and device for recognizing missed stitches during the op Process and device for recognizing missed stitches during the op

1991-09-24

1992-04-28

Nerbun, Peter

Sewing

Elements

Thread sensing

1122621, 200 6118, D05B 6936

Patent

active

051077795

ABSTRACT:
To recognize missed stitches during the operation of a sewing machine, a function, which represents the tensile force of a thread fed into a stitch-forming device depending on the angle of rotation of the main shaft, is scanned in its entirety during each revolution period of the main shaft for selected characteristics without regard to the location of this characteristic within the revolution period. The characteristics found are measured in order to obtain for each characteristic an analytical value that is compared with the corresponding analytical value from at least the last preceding revolution period to form the difference of the two analytical values. If this difference exceeds a predeterminable value, a decision corresponding to a missed stitch is made.

REFERENCES:
patent: 4170951 (1979-10-01), Dobrjanskyj
patent: 4328757 (1982-05-01), Inaba et al.
patent: 4628847 (1986-12-01), Rydborn
patent: 4763588 (1988-08-01), Rydborn

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