The lengths of the links comply with the conditions: A͞B=0͞A=a, 0͞C=C͞E=d and tan(α)=b/a, where α is fixed angle COf and b =sqrt(d²-a²). Link 1 has the form of a bent lever with angle COf equal to a. Link 1 turns about fixed axis 0 and is connected by turning pair C to link 5 and by a sliding pair to slider 3. Slider 3 is connected by turning pair B to link 4 which turns about fixed axis A. Slider 3 is also connected by turning pair B to link 7 which moves in cross-shaped slider 2 whose guides are perpendicular to each other. Link 5 is connected by turning pair E to slider 6 which moves along fixed guides p-p whose axis coincides with axis 0y. When link 1 turns about point 0, point D of slider 2 describes virtual parabola of Vincent io q-q with the equation y=sqrt(2ax)-sqrt(4b²-(2b²/a)*x).
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