| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage from being produced owing to dried grains and hence improve durability by accurately detecting starting time of revolutions of a drum and completion time with a descending detection sensor and an ascending detection sensor, and highly accurately detecting the revolutions of the drum to accurately detecting a grain feed amount. SOLUTION: Onoce a drum 16 provided on an upper portion of a machine is unwound, a cord 15 is unwound successively, and a weight 14 mounted on a lower end of the cord 15 makes contact with an upper surface of fed grains. Thereupon, the cord 15 is loosened, and a weight descending detection spring 21 is actuated to switch on the descending detection sensor 22, and then descending completion of the weight 14 is detected, and finally rotation of the drum 16 is interrupted. Then, as the drum 16 is wound up, looseness of the loosened cord 15 is removed and becomes tense into a vertical state. Thereupon, the weight descending detection spring 21 is actuated to bring the descending detection sensor 22 to off. Further, detection of wind-up revolutions of the drum 16 is started to wind up the weight 14 successively and ascend the weight 14 to an upper limit position, and once the ascending detection sensor 20 is on, it is judged wind-up of the weight 14 is completed to interrupt the rotation of the drum 16.
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