| 摘要 |
Apparatus is disclosed for imparting to a shaft either rotation or translation or both, by the rotation of one or both of two gears within the apparatus. Translation is provided by the rotation of a first gear having internal threads, which threads match a toothed rack superimposed upon a shaft which passes through the gear. Rotation of the shaft is provided by rotation of a second gear which is slotted to match the shaft and rack which passes through the second gear. The separate elements of first gear, second gear and racked shaft are each held in position relative to the other elements so as to allow desired movement of the elements while restraining all other movements.
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