| 摘要 |
PURPOSE:To gyrate a field-working machine when a rear working part is deviated from the center of the machine to left or right, by providing a driving machine part with a supporting shaft acting as a gyration center of the machine by thrusting the lower end of the shaft into the ground of a field, making the shaft to be freely movable along lateral direction and correcting the position of the supporting shaft. CONSTITUTION:A cylinder 13 is extended by the operation of a gyration operation lever 22 to thrust a thrusting head 15 into the ground of a field and the machine 1 is gyrated around the supporting shaft 16. The thrusting head 15 is attached to a base laterally movable by the extending and contracting motion of another cylinder and the position of the movable base is corrected based on the calculated result of the lateral deviation of a planting part 2 from the center of the machine.
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