| 摘要 |
A drive mechanism (20) including a first shaft (324) having a first fixed gear (328) and a second shaft (322) having second fixed gear (330) that engages the first fixed gear to cause the first shaft to rotate in an opposite direction than the second shaft. A first linkage (368) connecting the first shaft and the third shaft and includes a first one-way gear (336). A second linkage (366) connecting the second shaft and the third shaft and includes a second one-way gear (338). The third shaft outputs a unidirectional rotational motion.
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