| 摘要 |
PROBLEM TO BE SOLVED: To prevent the variation of a spring force caused by the displacement of a grounding part to cause the difficulty in the uniform control of the furrow depth on a field in a conventional fertilizing and sowing machine provided with a connection part to connect the machine to a traveling vehicle and a grounding part to move the machine in a manner following the undulation of the field surface, rotatably connecting both parts with a parallel link and placing a spring between the parts to enable the opening of a furrow by the following motion of the furrow-opening disk to the undulation of the field surface independent of the change of the posture of the traveling vehicle and the undulation of the field surface. SOLUTION: The fertilizing and sowing machine 1 is composed of a connection part 2 and a grounding part 3. The connection part 2 is connected to the grounding part 3 through parallel links 15, 16, the grounding part 3 is pressed against the field surface by rotatably pivoting both ends of a compression spring 24 to the connection part 2 and the grounding part 3 and the supporting axis 26 of the connection part of the compression spring 24 is positioned above the supporting axis 25 of the connection part and behind the grounding side axis relative to the moving direction of the machine 1.
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