Shaped cylinder 7 is keyed to shaft 1 and rotates about fixed axis A. Its rotation is transmitted by balls 2 to shaped cylinder 3 which is keyed to shaft 8 and rotates about fixed axis C. The direction of the axes of rotation of balls 2 and, therefore, the transmission ratio from the driving to the driven shaft depends upon the angle of inclination of axes B of guide rollers 4. When worm 5, keyed to shaft 9 is turned, worm wheels 6 are turned through a certain angle and thereby change the angle of inclination of axes B of rollers 4. The axes of the rollers remain, however, in planes passing through axes A and C.
$3477$CF,IV$