Pulleys 1 and 6 are of equal diameter. Pulley 1 rotates about fixed axis A and, through flexible link 2, rotates pulley 6 about fixed axis B. Links 3 and 7 are connected together by turning pair E, and to flexible link 2 by turning pairs C and D. Links 4 and 5 are connected together by turning pair H and to links 3 and 7 by turning pairs F and G. When pulley 1 rotates about axis A and points C and D are travelling along a straight portion of their path, links 3, 7, 4 and 5 have dwells with respect to flexible link 2. When points C and D pass over to a circular portion of their path, links 3, 7, 4 and 5 turn with respect to one another and with respect to flexible link 2.
$1922$FL,D$