Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Signalling – indicating – or display means
Patent
1976-11-29
1979-10-09
Rolla, Joseph J.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Signalling, indicating, or display means
209550, 209565, 209577, 209582, 250226, 356 51, 356407, B07C 5342
Patent
active
041703065
ABSTRACT:
A control apparatus for processing the electrical signals generated by an optical ratiometric color sorting scanner, said apparatus generating signals to cause the rejection of articles which differ in color and/or size from predetermined limits. In the scanner, two electrical signals are generated which are responsive to two different spectral regions or pass bands of the radiant energy reflected by the product being sorted. These signals are superimposed on a slowly varying signal responsive to the standing background light. The control circuitry processes the signals to delete the standing light signal and spurious noise signals and determines if the ratio between the signals is greater than or less than a predetermined value, or alternatively, determines when the ratio between the signals is not within a predetermined acceptable range and generates a delayed reject signal thereafter. Other circuits provide signals to a meter for displaying the present reject rate and particle feed rate. Also generated is a reject signal responsive to small unwanted foreign articles passing through the optical scanner, and an alarm circuit for signaling when the passage for articles is blocked or when the control apparatus fails to reject articles within a specified time interval. Two or more such scanners and control apparatus may be operated in tandem while processing the same type of articles, the control apparatus arranged as master and slaves, with the slave reject criteria servoed to that of the master.
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Arild Tor
Marshall William F.
Rolla Joseph J.
Ultra-Sort Corp.
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