Complex gear 1 rotates about fixed axis A and meshes with circular pinion 2. Pinion 2 has pin b which slides along slot a of gear 1. The slot and the pitch curve of gear 1 are of similar complex shape. Portions of slot a, d-d and e-e, describe circular arcs of radii r and r'. Pinion 2 is connected by turning pair D to link 3 which turns about fixed axis B. When gear 1 rotates at uniform velocity, link 3 has a complex oscillating motion with two long dwells during the periods when pin b slides along circular portions d-d ana e-e.
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