Flexible link 1 runs over pulleys 2 and 7, of equal diameter, and oscillates about fixed axis A. Link 3, designed as a bent lever, is connected by turning pairs D and E to pulleys 2 and 7 and by turning pair F to link 4 which turns about fixed axis B. Link 5 is connected by turning pairs F and G to links 3 and 4 and to link 6 which turns about fixed axis C. When flexible link 1 turns about axis A, links 3 and 5 have complex motions and links 4 and 6 oscillate about axes B and C.
$1990$FL,TC$