Connecting rod 4 is connected by turning pair A to link 2 of four-bar linkage BCDE and by turning pair F to slider 5 which moves along fixed guides a-a. Point A of link 2 describes connecting-rod curve b which is self-intersecting. As a result, slider 5 has two double strokes of different length, h₁ and h₂, to each complete revolution of cranks 1 and 3 about fixed axes B and E.
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