Low bobbin thread detection system including photodetector holde

Details Low bobbin thread detection system including photodetector holde Low bobbin thread detection system including photodetector holde

1979-06-04

1980-07-29

Hunter, H. Hampton

Sewing

Elements

Thread sensing

B65H 6302

Patent

active

042145422

ABSTRACT:
A holder containing the light detector of the low bobbin thread detection system of a sewing machine and including a light admitting aperture through which light may pass to a photodetector is provided with a plastic tubular collar which extends over the aperture and serves both as a shield to keep lint out of the aperture and as a lens to focus light on a light sensitive surface in the photodetector.

REFERENCES:
patent: 3599586 (1971-08-01), Newman
patent: 3738296 (1973-06-01), Mackenzie et al.

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