Flexible link 1 runs over pulleys 2 and 5, of equal diameter, and oscillates about fixed axis A. Link 3 is connected by turning pairs B and C to pulleys 2 and 5. Link 4 turns about fixed axis E and is connected by turning pair D to extension a of pulley 5. When flexible link 1 turns about axis A, link 3 has a complex motion and link 4 oscillates about axis E.
$1988$FL,TC$