| 摘要 |
An abutment module is provided to enable an abutment member to move downward with low power. An abutment module comprises an abutment member(16) and a guide member(48). The abutment member is displaced between an abutment position on a plane(18) and a non-abutment position below the plane by a setting member. The guide member has at least one guide track such that the abutment member is guided at a first point between the abutment position and the non-abutment position. The abutment member is pivotally connected with a setting element at a second point spaced apart from the first point. When the abutment member moves from the abutment position to the non-abutment position, the abutment member is pivoted in the working direction.
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