Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
Patent
1977-10-11
1979-03-27
Rolla, Joseph J.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Condition responsive means controls separating means
209546, 209565, 209577, 209586, 250226, 356407, 356448, B07C 5342
Patent
active
041461355
ABSTRACT:
An on-line detector for peach pits and peach pit fragments and the like remaining in peach halves following a pitting operation includes a sealed housing bordered on one side by an inclined view plate disposed between a feeding belt and a take-away belt. A peach half, pit cavity down, is passed by a viewing line above the view plate. Two different wavelengths of light are directed toward the viewing line and are reflected by a passing fruit section toward an array of light sensors. One of the wavelengths of light is controlled in on-off condition by a clock, being turned on during only a portion of each clock cycle. Output from each one in the array of light sensors is sampled during the portion of each clock cycle that the one wavelength is on, and differenced with the light sensor output from that sensor when the other wavelength only is on. Differencing occurs during each clock cycle and a difference output appears only in the presence of a pit or a pit fragment. Difference signals are summed to provide an indication of the size of a detected pit or pit fragment, and the summation is used to control accept/reject mechanism on-line downstream of the viewing line.
REFERENCES:
patent: 2823800 (1958-02-01), Bliss
patent: 2933613 (1960-04-01), Powers
patent: 3005550 (1961-10-01), Flanders et al.
patent: 3467254 (1969-09-01), Simmons
patent: 3628657 (1971-12-01), Billett
patent: 3910701 (1975-10-01), Henderson et al.
Chamberlin Donald W.
Sarkar Subhash C.
FMC Corporation
Kelly R. S.
Rolla Joseph J.
Stanley H. M.
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