Cloth-pattern sensing device for a sewing machine

Details Cloth-pattern sensing device for a sewing machine Cloth-pattern sensing device for a sewing machine

1988-12-21

1990-04-17

Nerbun, Peter

Sewing

Special machines

Darning

112314, 112320, 250205, D05B 1900, D05B 2706, D05B 2708, G01J 128

Patent

active

049170317

ABSTRACT:
A device for performing an initial setting of a photosensor of a sewing machine including a light-emitting element and a light-receiving element. The device adjusts the strength of light emitted by the light-emitting element so that the output of the light-receiving element responding to the emitted light falls within a preset normal range. Thus the output from the light-receiving element is normalized and the photo-sensor can correctly discriminate various levels of reflectance, i.e., between a pattern signal and a cloth-edge signal, or among pattern signals of various brightnesses.

REFERENCES:
patent: 4565140 (1986-01-01), Martell et al.
patent: 4612867 (1986-09-01), Rosch et al.
patent: 4732095 (1988-03-01), Saito et al.
patent: 4757773 (1988-07-01), Nomura et al.
patent: 4766828 (1988-08-01), Nomura et al.
patent: 4769532 (1988-09-01), Kawakami

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