The lengths of the links comply with the conditions: D͞K=K͞E=a, K͞C=F͞B=c, K͞F=C͞B=b and A͞B=a+b+c. Crank 1 turns about fixed axis A and is connected by turning pairs B to links 6 and 7. Sliders 2 and 3 move along fixed guides p. Links 5 and 4 are connected by turning pairs D and E to sliders 2 and 3, and by turning pairs C and F to links 7 and 6. Links 5 and 4 are connected together by turning pair K. When crank 1 turns about axis A, point K describes an ellipse with the equation (x²/(a-2b)²)+(y²/a²)=1.
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