Pulleys 1 and 2 are of equal diameter. Pulley 1 rotates about fixed axis A and, through flexible link 5, rotates pulley 2 about fixed axis B. Link 3 is connected by turning pairs C and D to flexible link 5 and to link 4 which turns about axis B. When pulley 1 rotates about axis A, link 3 has a complex motion and link 4 oscillates about axis B.
$1889$FL,6L$