| 摘要 |
PROBLEM TO BE SOLVED: To keep a seedling planting apparatus to a preset ground height in high accuracy in an automatic lift-control independent of the planting depth control without taking effort on the lay-out of parts or causing the increase of cost and the lowering of assembling work efficiency and maintainability. SOLUTION: The planting depth is adjusted by varying the height of a grounding member 17 relative to a planting mechanism 16 by an operation means 51, and the action of an actuator 2 for lifting and lowering a seedling planting apparatus by a controlling means 40 in a manner to coincide the detected angleθb of the grounding member 17 detected by a tilt angle detection means 54 with a preset controlling target angleθo to keep the seedling planting apparatus 4 to a preset ground height. The lift controlling structure of a planting work machine having the above structure is further provided with a correction means 64 to correct the detection angleθb of the tilt angle detection means 54 interlocked with the control of planting depth. COPYRIGHT: (C)2008,JPO&INPIT
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