Link 1 has slot b which slides along fixed block 3 of the base. Gear rack a of link 1 meshes with gear 2 which rotates about fixed axis B. Links 4 and 5 are connected together by turning pair A, and by turning pairs C and D to gear 2 and link 1. When driving link 1 reciprocates, links 4 and 5 have complex motions and point A describes a complex connecting-rod curve.
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