Apparatus for sensing a characteristic of a traveling yarn

Details Apparatus for sensing a characteristic of a traveling yarn Apparatus for sensing a characteristic of a traveling yarn

1988-12-22

1990-10-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356429, G01N 2186

Patent

active

049637576

ABSTRACT:
An apparatus for sensing characteristics of a traveling yarn in response to the shadow cast by the yarn includes a light emitting element and a pair of light sensing elements in opposed relation to the light emitting element. The yarn travels through a slot between the light emitting element and the pair of light sensing elements and is guided such that only a selected one of the light sensing elements is shadowed. An aperture assembly can be positioned between the light emitting element and the slot to channel the emitted light. The aperture assembly includes a plurality of apertures increasing in area in the direction away from the light emitting element and being framed by surfaces inclined away from the light emitting element and decreasingly inclined from frame to frame in the direction away from the light emitting element.

REFERENCES:
patent: 2438365 (1948-03-01), Hepp et al.
patent: 3401267 (1968-09-01), Engle et al.
patent: 3582661 (1971-06-01), Emmasingel
patent: 3712743 (1973-01-01), Harris et al.
patent: 3840869 (1974-10-01), Pugh
patent: 4021119 (1977-05-01), Stauffer

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