Gear 1 rotates about fixed axis A and meshes with gear 2 which rotates about fixed axis B. Round eccentrics 4 and 5 are each rigidly attached to (or integral with) gears 1 and 2. Eccentric 4 is connected by a turning pair, designed as collar a encircling the eccentric, to link 3. Link 3 is connected by turning pair C to link 6 which, in turn, is connected by a turning pair, designed as collar b encircling eccentric 5, to this eccentric. Gears 1 and 2 have the same pitch diameter, and eccentrics 4 and 5 are of the same diameter. When driving gear 1 rotates, link 3 has a complex motion and point D of this link describes a complex connecting-rod curve.
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