| 摘要 |
The bevel gear(42) for a claw clutch that is fixed to the upper part of the several vertical axises, is established with idling conditions and changes the clutch's rotational angle. A key(43) is fixed with an up-and-down compression spring(45) that is installed at the lower part of the slide-claw clutch(44). When a stone jams the pulling blade, the slide claw clutch(44) breaks away, cutting off the pulling power automatically.
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