| 摘要 |
PROBLEM TO BE SOLVED: To avoid trouble in unexpectedly lifting and lowering an implement without causing deterioration of assembling properties, etc., when positional control after automatic lifting control can be performed. SOLUTION: A structure for lifting and lowering operation of the implement is composed as follows. The structure is designed to perform the positional control for lifting and lowering the implement 7 to a height and position corresponding to an operation position of a height setting lever 15, the automatic lifting control for automatically lifting the implement 7 by operation of an electric actuator 35 and the automatic lowering control for automatically lowering the implement 7 by the operation of the electric actuator 35. A controlling means 39 determines an output target value of a lever position detecting means 49 corresponding to the output of a height and position detecting means 38 on the basis of the output of the height and position detecting means 38 and a correlation between the output and the output of the lever position detecting means 49. The automatic lowering control is performed when the output value of the lever position detecting means 49 coincides with the output target value. COPYRIGHT: (C)2007,JPO&INPIT
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