Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
Patent
1978-05-05
1982-08-17
Spar, Robert J.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Condition responsive means controls separating means
209582, 209587, 250226, 356407, B07C 5342
Patent
active
043445390
ABSTRACT:
A sorting apparatus universally applicable to any article sorting task without the necessity of changing a background member for each article type is characterized by first and second optically imposed "backgrounds" against which light reflected from the same portion of each article passing within a predetermined viewed area as defined by an optical frame is detected. Photodetectors associated with each "background" are operative to generate first and second electrical signal representations of the reflected light detected against each background. An electrical signal representative of the portion of the viewed area occupied by the article and functionally related to the difference between first and second signal representations is used to scale one of the first or second signals to provide a signal representation of the full-frame percentage reflectivity of the article. Additionally, a nulling circuit is operative while the articles are passing through the viewer to provide drift compensation.
REFERENCES:
patent: 2879407 (1959-03-01), Cox
patent: 3066797 (1962-12-01), Fraenkel
patent: 3382975 (1968-05-01), Hoover
patent: 3899415 (1975-08-01), Codding et al.
patent: 4147619 (1979-04-01), Wassmer et al.
Spar Robert J.
Wacyra Edward M.
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