Gear 1 rotates about fixed axis C and meshes with gear 2 which rotates about fixed axis D. Gear 1 is connected by turning pair A to slotted link 3. Roller 4 is connected by turning pair B to gear 2 and slides along slot a of link 3. When gear 1 rotates, various points of slotted link 3 describe complex connecting-rod curves whose shape depends upon the dimensions of the links and the shape of slot a in link 3.
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