电动机单向旋转，用曲柄摇杆机构换向，实现悬点的往复直线运动。
The prime motor rotates in a fixed direction and the alternating motion of the carrier bar is accomplished by the crank-rocker mechanism.
电动机单向旋转，用曲柄摇杆机构换向，实现悬点的往复直线运动。
The prime motor rotates in a fixed direction and the alternating motion of the carrier bar is accomplished by the crank-rocker mechanism.
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