| 摘要 |
A cat and mouse type device includes at least one rod fixed to a shaft with at least one planetary gear rotatably attached to an end of the rod. Bars extending away from the planeatary gear ride in grooves on the faces of two rotors. The planetary gear rotates around a fixed sun gear attached to the housing, so that the two rotors rotate with respect to one another and with respect to the housing in a predetermined manner. Protuberances may be provided to extend away from the rotors and the planetary gear to interact with one another during rotation, preventing the rotors from deadlocking.
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