| 摘要 |
PROBLEM TO BE SOLVED: To aim at the improvement of accuracy by using an usual dead zone width Vr in descending from the ascended position of e.g. a rotary plowing implement 12 until a position becoming a state of making a contact with ground, using a wider than usual dead zone width 3Vr after making the contact with the ground for delaying the descend of the implement 12 so as to suppress the rapid descend to an objective plowing depth and also make an initial plowing work state well by setting a pile of the soil A at an initial state of the plowing as small. SOLUTION: This ascendance and descend-controlling device of the implement 12 equipped at a machine body as freely ascending and descending is provided by installing the variable dead zone width Vr of a controlling mechanism 60 for descend-controlling the implement 12. COPYRIGHT: (C)2005,JPO&NCIPI
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