Link 4, designed as a bent lever, turns about fixed axis B and is connected by turning pairs D and E to pulleys 5 and 6, of equal diameter. Flexible link 7 runs over the pulleys and is connected by turning pairs C and G to links 1 and 2. Link 1 turns about fixed axis A and link 2 is connected by turning pair F to link 3 which turns about axis B. When link 1 turns about axis A, link 2 has a complex motion and links 3 and 4 oscillate about axis B.
$2030$FL,Sa$