Electronic size and color sorter

Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means

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Details

209558, 209586, 209582, 250560, 356 73, 356398, 356407, 356425, B07C 510, B07C 5342

Patent

active

041323149

ABSTRACT:
Disclosed is apparatus for sorting objects, e.g. tomatoes, according to both size and color. A preferred embodiment can sort the objects into fourteen size/color categories and yet requires only two photodetectors. The objects travel on a conveyor belt past a sensing station having a light source to illuminate an object and a pair of phototransistors for receiving light reflected from the object in two different color bands, e.g. red and green. The phototransistors produce a pair of output electrical signals. An analog divider forms a ratio of the electrical signals and the peak value is stored and compared with preset limits to produce a color category signal. A size category signal is derived on the basis of the time duration of the signal produced by the summation of the phototransistors' signals. The size and color category signals are decoded to produce a size/color category signal which is fed through a shift register in synchronism with the speed of the conveyor belt to actuate an associated ejection mechanism.

REFERENCES:
patent: 3750883 (1973-08-01), Irving et al.
patent: 3781554 (1973-12-01), Krivoshiev et al.
patent: 4011950 (1977-03-01), McLoughlin et al.
patent: 4057146 (1977-11-01), Castaneda et al.

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