Rotation transmission between two skew shafts with rope belt.

By moving the yellow bar it is possible to adjust angle between the shafts (from 0 to 360 deg.) and their axle distance.

The belt wraps 1 rev. around the blue pulley.

Two belt branches connecting to the pink pulley can be crossed to increase arc of contact or to reverse output direction.

To some extent it is a constant velocity joint.