Lever 1 turns about fixed axis A. Link 2 is hinged to lever 1 by turning pair B. The straight edge a-a of link 2 is in contact with contour b-b of fixed cam 3. When lever 1 is turned counterclockwise point C of link 2 travels to position C' . Various paths CC' of point C can be obtained by changing the contour b-b of cam 3. Spring 4 holds link 2 against the cam.
$134$SL,L$