| 摘要 |
The invention relates to a rack and pinion rotary drive. The drive comprises at least two racks (10,20) adapted to reciprocate linearly between first and second position. A pinion (1) is provided having at least one rack engaging member (2) over an arcuate part of the periphery of the pinion and at least one non- rack engaging member (3) over the other arcuate part of the periphery of the pinion. In use the racks being aligned around the pinion such that each rack sequentially is adjacent with and engages a rack engaging member to rotate the pinion as the rack moves from the first to the second position, and disengages from the rack engaging member as the pinion rotates and is adjacent a non-rack engaging member as the rack moves from the second to the first position. |
