PURPOSE:To reduce the content of wheat of the supplied unhulled rice by communicating a discharge port for receiving the unhulled rice concentrated on the swung-down side to a hulling device in the succeeding stage and a discharge port for receiving the wheat-contg. unhulled rice concentrated on the swung-up side to a gravity classifier. CONSTITUTION:The unhulled rice is supplied to a rocking classifier 1, separated and classified by the rocking of the classifying disks 2, 2,... mainly due to the difference in the grain diameter. The large-diameter mixed wheat is concentrated on the swung-down side and discharged to the gravity classifier 8 side through a discharge port 4 along with a part of the unhulled rice. The remaining part is mostly sent to the feed part of a hulling device 6 through a discharge port 3. The heavy wheat is collected at the lower part and the light unhulled rice at the upper part by the classifying air from the lower part, and the rice and wheat are separated in the rocking direction by the rocking of the classifying disk 9. The separated wheat from a discharge port 10 is discharged into a mixed wheat tank 12. The separated unhulled rice from a discharge port 11 is returned to the feed part, and classification is repeated.
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