PURPOSE: To improve the grading performance of the vibration grader for winnowing the threshed product from the threshing chamber.
CONSTITUTION: An auxiliary air blower 7 is set in order to blow the wind toward the rear end between the feed pan 5 constituting the top end side of the vibrator grader 3 winnowing the threshed product from the threshing room l and the fan case 6 of the winnower, and the inhale side of the wind duct 8 for the auxiliary blower 7 is turned to the exhaustion duct of the hot air from the engine E. Further, the outlet of winnowing wind which is sent between the threshing chamber 1 and the top end of the vibrator grader 3 and the outlet of the duct feeding air to the rice stem-feeding inlet are opened so that the wind from the winnowing fan 4 may be selectively switched to the winnowing duct or to the feeding duct. When the rice stem sensor detects 'yes', the winnowing fan case 6 is connected to the winnowing duct and it is switched, when the sensor detects 'no'.
KOMATSU MASAYA
ODA MASAAKI
ODATE MAKOTO
