Strand responsive electrical switch

Details Strand responsive electrical switch Strand responsive electrical switch

1977-01-31

1979-10-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

28187, 250229, G01N 2130

Patent

active

041699815

ABSTRACT:
In combination with apparatus for advancing at least one individual tensioned textile strand along a predetermined path of travel, an electrical switch capable of signalling a need for stopping of the apparatus in response to the occurrence of an improper operating condition of an individual strand. The switch device has a housing for mounting adjacent the path of travel of a strand, a guide for engagement with the strand and for movement relative to the housing in response to strand conditions such as breakage or excessive slack, a light actuated electrical switch within the housing, a light source within the housing for illuminating the switch, and a shutter mounted for movement in response to movement of the guide and optically interposed between the switch and the light source for controlling the electrical signalling of the switch in response to occurrence of improper operating conditions.

REFERENCES:
patent: 2233483 (1941-03-01), Metcalf
patent: 3010273 (1961-11-01), Bailey
patent: 3800162 (1974-03-01), Lueck

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