Pulleys 1 and 4 are of equal diameter. Pulley 1 rotates about fixed axis A and, through flexible link 5, rotates pulley 4 about fixed axis B. Links 2 and 3 are connected together by turning pair D and to flexible link 5 by turning pairs C and E. When pulley 1 rotates about axis A, and points C and E are travelling along a straight portion of their path, links 2 and 3 have dwells with respect to flexible link 5. When either point C or E passes over to a circular portion of its path, links 2 and 3 turn with respect to flexible link 5.
$1927$FL,D$