Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-04-20
1977-07-12
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2091117T, G01D 2104, G06M 700, H01J 3912
Patent
active
040356361
ABSTRACT:
Apparatus for successively projecting a light beam through articles of produce on a moving conveyor. The apparatus is useful in an internal quality produce grader for grading agricultural products according to one or more internal characteristics.
The apparatus is comprised of two cylinders positioned on opposite sides of a conveyor which carries uniformly spaced articles of produce in a single row past an inspection position. The cylinders have a plurality of equiangularly spaced apertures in their walls. The apertures are at the same vertical height as the produce on the conveyor. A bellows-like, tubular light shield of opaque, flexible, elastomeric material is disposed in each aperture and extends radially therefrom. The cylinders rotate in synchronism with the movement of the produce on the conveyor and when each article of produce is at the inspection position a pair of light shields, one from each cylinder, is aligned along an axis with the article. The light shields yieldingly engage the article.
A light source on one side of the conveyor directs a light beam along the axis and through the aligned light shields and article. A photodetector on the other side of the conveyor receives light transmitted through the aligned light shields and article.
REFERENCES:
patent: 3206022 (1965-09-01), Roberts, Jr. et al.
patent: 3580380 (1971-05-01), Phillips
patent: 3930994 (1976-01-01), Conway et al.
patent: 3981590 (1976-09-01), Perkins
AMF Incorporated
Gallagher John H.
Moore David K.
Price George W.
Smith Alfred E.
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