Optoelectronic scanner for sewing machine

Details Optoelectronic scanner for sewing machine Optoelectronic scanner for sewing machine

1984-06-27

1986-03-11

Reynolds, Wm. Carter

Sewing

Elements

Starting or stopping

112277, 250548, D05B 3500

Patent

active

045747199

ABSTRACT:
A workpiece fed to a stitching point of a sewing machine, consisting of one or more layers of fabric, is transluminated by a source of visible or infrared radiation which is intercepted by two photoelectric sensors following each other in the direction of motion. The sensors work into respective radiation/frequency converters whose output voltages, after rectification, are compared in a window discriminator to provide an indication of the passage of a leading or trailing edge of a fabric layer manifesting itself in a jump in one of the voltages. The jump is intensified by a threshold circuit in each converter, comprising a Zener diode which for highly light-transmissive fabric layers can be short-circuited by an optocoupler.

REFERENCES:
patent: 3867889 (1975-02-01), Conner, Jr.
patent: 4038931 (1977-08-01), Kosrow et al.
patent: 4359953 (1982-11-01), Martell et al.
patent: 4370059 (1983-01-01), Masuda
patent: 4403558 (1983-09-01), Martell et al.

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