Pulleys 1 and 2 are of equal diameter, as are pulleys 7 and 6. Pulley 1 rotates about fixed axis A and, throug flexible link 5, rotates pulley 2 about fixed axis C. Link 3 is connected by turning pairs D and E to flexible links 5 and 4. Flexible link 4 runs over pulleys 7 and 6 which rotate about fixed axes B and C. When pulley 1 rotates about axis A, pulleys 7 and 6 rotate about axes B and C, imparting complex motion to link 3.
$1920$FL,ML$