Pulley 1 rotates about fixed axis B and transmits rotation through flexible links 2 and 3 to pulleys a and b. Since link 3 is crossed and link 2 is open, pulleys a and b rotate in opposite directions about fixed axis A. Rigidly attached to pulleys a and b are internal gear 4 and external gear 5 which mesh with planet idler gear 6. Gear 6 is connected by turning pair C to carrier 7 which rotates about axis A. The speeds n₁ and n₇ of pulley 1 and carrier 7 (in rpm) are related by the equation n₇=n₁*(R₁/(R_a*R_b))*((R_b*z₄-R_a*z₅)/(z₄+z₅)) where z₄ and z₅ are the number of teeth of gears 4 and 5, and R₁, R_a and R_b are the radii of pulleys 1, a and b.
$3568$CFL,DF$