Circular pinion 1 rotates about fixed axis A and meshes with complex gear 2. The pitch line of gear 2 consists of two semicircles of radius r and two circular arcs of radii r' and r". The dimensions of gear 2 comply with the condition: r''-r'=2r. Gear 2 is connected by turning pair B to link 3 which turns about fixed axis C. When pinion 1 rotates at constant velocity, link 3 has a complex oscillating motion.
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