Pulley 1 rotates about fixed axis A. Identical pulleys 3 rotate about fixed axes B. Crosspiece 5 reciprocates along fixed guides a and b, and carries pulley 4 which rotates about axis C. Endless flexible link 2 runs over pulleys 1, 3 and 4. When pulley 1 rotates, pulleys 3 and 4 rotate about their axes and crosspiece 5 with pulley 4 can travel with any kind of motion along guides a and b.
$3570$CFL,DF$