Patent ID: 6013887
Filing Date: 2000-01-11
Classification: B07C,Y10S

Abstract:
A color-sorting machine for granular materials comprising: means for supplying raw material grains; transport means for dropping the raw material grains fed from the supplying said supplying means in a substantially fixed path; at least one optical detection device for optically detecting the falling raw material grains and outputting detection signals, said optical detection device comprising an optical detection unit provided along the drop path of the raw material grains, a background, and illumination units, said optical detection unit comprising a condenser lens for collecting light from the falling raw material grains, a plurality of optical filters for separating the light passing through said lens, a plurality of light-receiving sensors corresponding to said filters and a prism disposed between said condenser lens and said light-receiving sensors, said light-receiving sensors being formed in a unit body to lie side by side on the same plane, said prism having light path diffraction surfaces of the same number as said light-receiving sensors so that said light-receiving sensors receive light of the same point of view; sorting means for removing no-good grains from the falling raw material grains in response to the output signal from said optical detection device; and control means connected to said supplying means, said optical detection device and said sorting means for control operation.