| 摘要 |
PURPOSE:To prevent the overflowing of bag content and thus improve operational efficiency by providing a position sensing means for sensing the position of a reciprocating actuator and by completing bag closing operation upon a reduction in the change amount per unit time of sensed values in the neighborhood of one terminal position. CONSTITUTION:When an actuator 52 normally reaches a terminal position P2 and a shutter 32 is fully opened, a chain motor M1 is reversely rotated until the actuator 52 reaches a stand-by position P5. Grains are discharged from a hopper 31 into a unhulled rice bag 2 and, when the bag is filled with the grains and an unhulled rice sensor S5 provided at a discharge outlet 33 is turned on, the chain motor M1 is reversely rotated. The reverse rotation of the chain motor M1 continues until the output values of a potentiometer 56 becomes VR3 after reaching VR7, i.e. until the change amount dVR/dt in the output value thereof drops below a preset value K. Here, the output values VR3 and VR7 are the standard values of the potentiometer 56 when the actuator 52 moves in the respective terminal position P3 and position P7. |
