Two identical pulleys 2 and 3 rotate about axes A and B of slide 1 which reciprocates in fixed guide D. Flexible link 4 runs over pulleys 2 and 3, and is rigidly attached to the base at point C. When slide 1 is moved, the pulleys roll along the flexible link. When one of the pulleys is turned, the displacement of slide 1 is s=Rφ, where R is the radius of the pulleys and φ is the angle through which the pulley is turned.
$3481$SFL,4L$