Link 2, designed as a bent lever, is connected by turning pairs C, D and G to pulleys 6 and 5, of equal diameter, and to link 3. Flexible link 7 runs over the pulleys and is connected by turning pairs E and F to links 1 and 4. Links 1, 4 and 3 turn about fixed axes A and B. When link 1 turns about axis A, link 2 has a complex motion and links 3 and 4 oscillate about axis B.
$2090$FL,Sa$