| 摘要 |
PROBLEM TO BE SOLVED: To provide a rice transplanter capable of regulating switching sensitivity of elevating/lowering switching means against vertical movement of a float so as to keep the seedling planting depth of a planting device constant.SOLUTION: In a rice transplanter 1 provided by connecting a planting device 3 at the rear side of a travelling body 2 to be freely elevated and lowered through an elevating/lowering mechanism 4, there are provided a hydraulic cylinder 33 (elevating/lowering actuator) elevating and lowering a planting device 3, a hydraulic switching valve 34 (elevating/lowering switching means) performing elevating/lowering control of the hydraulic cylinder 33 (elevating/lowering actuator), and a switching operation arm 35 switching the hydraulic switching valve 34 (elevating/lowering switching means) are equipped on the elevating/lowering mechanism 4, and vertical movement detecting means 71 detecting vertical movement of a float 70 set on the planting device 3 and a speed change arm 55 changing the travelling speed of the travelling body 2 are connected and linked to a switching operation arm 35, and when the travelling speed is changed to the acceleration side, the hydraulic switching valve 34 (elevating/lowering switching means) is operated to the deeper side of the planting depth according to the acceleration of the speed. |
