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 3, 4 and 7 are connected by turning pairs D and C to flexible link 5. Link 7 is connected by turning pairs E and F to links 4 and 2. Link 2 is connected by turning ipair G to link 3. When pulley 1 rotates about axis A, and points C and D are travelling along a straight portion of the 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.
$1928$FL,D$