Low bobbin thread detection system

Details Low bobbin thread detection system Low bobbin thread detection system

1979-01-25

1980-02-19

Nerbun, Peter P.

Sewing

Elements

Thread sensing

250239, D05B 6900, G01B 712

Patent

active

041889010

ABSTRACT:
A low bobbin thread detection system for sewing machines. A light source transmits a beam of light through a pair of passageways contained in the bobbin case and toward a photodetector enclosed in a shield to shelter it from stray light. The light shield contains a pair of spaced apertures whose axes are in optical alignment with the light source and the bobbin case passageways. The thread carrying bobbin lies intermediate the passageways and does not permit the transmission of light from the first to the second passageway while thread remains thereon. When sufficient thread has been consumed from the bobbin, light may pass from the light source to the photodetector. Light which is directed at the shield surrounding the photodetector from any angle other than that coincident with the optical axis formed by the two apertures is blocked from impinging on the photodetector and will not falsely trigger a low bobbin thread alarm.

REFERENCES:
patent: 1988255 (1935-01-01), Soons
patent: 3082968 (1963-03-01), Reichelt et al.
patent: 3599586 (1971-08-01), Newman
patent: 3845320 (1974-10-01), Winberg
patent: 4021119 (1977-05-01), Stauffer

Affiliated with

Also associated with

Rating

Low bobbin thread detection system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low bobbin thread detection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low bobbin thread detection system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-648780