Link 1, rotating 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, between the arms. Arm Md of link 2 moves in slider 3 which rotates about fixed axis F. Centre F is placed at one focus of an ellipse and centre A on the axis 0y, passing through the centre 0 of the ellipse, so that the distance A͞0 equals A͞0=0͞F/tan(ϕ) and length A͞M of link 1 is taken equal to A͞M=a/sin(ϕ) where a is the major semiaxis of the ellipse. Then, the straight line Mf envelops ellipse q-q when link 1 rotates about axis A.
$1046$LG,Ge$