| 摘要 |
PROBLEM TO BE SOLVED: To provide a working machine such as a rice planting machine for transplanting seedlings, constituted so as not to cause mud pushing, etc., by float without setting up hunting of an operation device when grounding the operation device to a field and returning sensitivity of oil pressure from insensitive side to a set value. SOLUTION: When carrying out sensitivity control by lowering the operation device, detecting grounding of a planting part (a body to be detected) to a field and controlling opening of a hydraulic valve, the position of a detection wire is set to 11/11 (insensitive side) when lowering of the operation device is started and after detecting grounding of the body to be detected is detected, sensitivity is slowly changed for a 1.5 sec (1-2 sec) to an intermediate position between a set detection sensitivity on insensitive side and a detection sensitivity 1/11 (on sensitive side) at the time of operation and for 3 sec (2-4 sec) to a detection sensitivity 1/11 at the time of operation to prevent induction of hunting and mud pushing by changeover of detection sensitivity. COPYRIGHT: (C)2006,JPO&NCIPI
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