The lengths of the links comply with the conditions: 0͞A=A͞B=a. Link 1, turning about fixed axis 0, is connected by turning pair A to slider 3 which moves along cross-piece Cd of slider 4. Slider 4 moves along fixed guides p-p whose axis coincides with axis 0y. Link 1 is connected by a sliding pair to cross-shaped slider 2 which has guides perpendicular to each other. Link 5 is connected by turning pair B to slider 3 and by a sliding pair to slider 2. When link 1 turns about axis 0 , point D of link 2 describes cardioid q-q with the equation ρD=0͞D=a(1+cos(ϕ)) where ϕ is the polar angle between vector ρD and polar axis 0x.
$1147$LG,Ge$