Flexible link 2 runs over pulleys 1, 5, 6 and 7 of equal diameter. Link 3 is connected by turning pair E to flexible link 2 and by turning pair F to slider 4 which moves along fixed guide a with its axis parallel to lines AB and CD. When point E travels along the horizontal straight portions of its path, the velocities of points E and F are equal, i.e. link 3 has translational motion. When point E travels along the circular portions of its path, the motions of links 3 and 4 are equivalent to those of a slider-crank mechanism in which the length of the crank equals the radius of the pulleys.
$1868$FL,6L$