Pulleys 1 and 4 are of equal diameter. Pulley 1 rotates about fixed axis A and, through flexible link 7, rotates pulley 4 about fixed axis B. Links 3 and 5 turn about fixed axes C and D and are connected by turning pairs E and G to links 2 and 6 which, in turn, are connected by turning pairs F and H to flexible link 7. When pulley 1 rotates about axis A, links 2 and 6 have complex motions and links 3 and 5 oscillate about axes C and D.
$1906$FL,ML$