Device for detecting an overlapping edge of material on a sewing machine
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United States of America Patent
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Sep 29, 1987
Grant Date -
N/A
app pub date -
May 29, 1986
filing date -
Jun 1, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for detecting an overlapping edge of material on a sewing machine has, in combination, a signal-level discriminator and an optical waveguide. The optical waveguide has a light-receiving end on the sewing machine for receiving light through the overlapping edge of the material. The optical waveguide may be an optic fiber which, because of its small, flexible size can be accommodated easily even in the crowded sewing head or bed of an industrial sewing machine. The other end of the optical waveguide is remote from the light-receiving end for providing the received light to the signal-level discriminator which, therefore, is also remote from the crowded sewing head or bed of the sewing machine which, in addition, could interfere with its operation. For operation, the signal-level discriminator has an electro-optic sensor responsive to the light from the optical waveguide and a detector electrically responsive to light sensed by the electro-optic sensor for determining an absolute, light-intensity value of the sensed light which, therefore, detects the overlapping edge of the material accurately the corresponding change in determined light intensity.
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