Device for detecting the variation of thickness of a fabric and

Details Device for detecting the variation of thickness of a fabric and Device for detecting the variation of thickness of a fabric and

1986-06-03

1989-05-09

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250571, 356434, G01M 2186

Patent

active

048291943

ABSTRACT:
A device for detecting a thickness variation of a piece of fabric passing under the presser foot of a sewing machine. The device includes a transmitter and receiver between which the fabric passes. The receiver stores maximum and minimum signals in memory units generated when the fabric passes between the transmitter and receiver. A computing unit calibrates the thresholds as a function of the stored maximum and minimum signals. A comparator compares the incoming signals with the calibrated thresholds and sends a signal to a logic unit to control the sewing operations accordingly.

REFERENCES:
patent: 3609373 (1971-09-01), Desai
patent: 4237378 (1980-12-01), Jones
patent: 4248168 (1981-02-01), Hoffman
patent: 4380390 (1983-04-01), Arndt et al.
patent: 4696246 (1987-09-01), Rohr et al.

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