Pinion 1 rotates about fixed axis A. Link 2 reciprocates along axis B-B in fixed guides a-a. Pinion 1 has its teeth arranged along one half of its pitch circle. Link 2 has duplex toothed rack c. When pinion 1 rotates continuously in one direction its teeth alternately engage the two sides of rack c, imparting a sliding motion to link 2 in the right and left directions. To avoid impacts at the instants of reversal of link 2, pinion 1 has pin d which slides along profiled cams e of link 2.
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