Pulleys 1 and 6 are of equal diameter. Pulley 1 rotates about fixed axis A and, through flexible link 5, rotates pulley 6 about fixed axis B. Links 7 and 3 are connected by turning pairs C and D to flexible link 5, by turning pairs E and F to link 4 and by turning pairs G and H to link 2. When pulley 1 rotates about axis A, and phoints C and D are travelling along a straight portion of their path, links 2, 3, 4 and 7 have dwells with respect to flexible link 5. When either point C or D passes over to a circular portion of its path, links 2, 3, 4 and 7 turn with respect to flexible link 5.
$1925$FL,D$