The mechanism is based on four-bar linkage BCEF in which point M of connecting rod 6 describes curve q-q. Sliders 7 and 8 are connected together by turning pair P and move along axes Bb and Ff of links 2 and 3. Link 4 is connected by turning pair M to link 6 and by a sliding pair to slider 5 . Slider 5 is connected by/ turning pair P to sliders 7 and 8. Point P describes curve p-p which is the space centrode of link 6. Straight line tMt, belonging to link 4, is always tangent to connecting-rod curve q-q. Link 9, turning about fixed axis A, is connected by a sliding pair to cross-shaped slider 10 which has guides perpendicular to each other. Point D of slider 10 describes curve r-r which is the pedal curve of connecting rod curve q-q, with respect to centre A.
$1205$LG,Ge$