Link 1, turning about fixed axis A, is connected by turning pair M to link 2 which has the form of a bent lever with the angle dMf equal to ϕ. Arm Md of link 2 moves in slider 3 which turns about fixed axis F. Centre F is placed at one of the foci of a hyperbola, centre A is placed on axis Oy, passing through the centre of the hyperbola, at the distancen A͞0=0͞F/tan(ϕ) and the length A͞M of link 1 is taken equal to A͞M=a/sin(ϕ), where a is the transverse semiaxis of the hyperbola. Then, when link 1 turns about axis A, straight line f-f envelops hyperbola q-q.
$1085$LG,Ge$