| 摘要 |
<p>@ A sorting machine for sorting objects by examining light reflected or transmitted by the objects in at least two different parts of the spectrum, said sorting machine comprising feeding means (10-141 for feeding objects (11) to be sorted to a viewing zone (15); illuminating means (23, 24) for effecting illumination in at least two different parts of the spectrum of objects (11) passing through the viewing zone (15); viewing means (27) arranged to view objects (11) passing through the viewing zone (15); at least one background means (35) against which the objects (111 are viewed by the viewing means (27); discriminator means (42), controlled by the output from the viewing means (27), for determining whether objects (11) which have been so viewed are desired or undesired; and object separation means (43), controlled by said discriminator means (42), for effecting relative separation between desired and undesired objects (11), characterised by at least first and second lighting means (33, 34) for each background means (35), the said first and second lighting means (33, 34) being separate from the said illuminating means (23, 24) and being respectively arranged in operation to cause the respective background means (35) to emit light in said at least two different parts of the spectrum.</p> |
