Identical pulleys 1 and 5 rotate about fixed axes A and C. Driven pulley 3 rotates about axis B of movable bearing housing 6. Identical guide pulleys 2 and 4 rotate about axes D and E of bearing housing 6. Endless flexible link 7 runs over pulleys 1, 2, 3, 4 and 5. When pulley 1 rotates about axis A, all the other pulleys rotate about their axes, and bearing housing 6 can be moved to any position along fixed guide a.
$3579$CFL,DF$