Blue outter disk and pink fork rotate around a fixed axis.
Green inner disk rotates idly on the pink fork.
The arrows show which link is the driving at different times.

1. When the blue outter disk is driving, its anticlockwise rotation is transmitted to the green inner disk by wedging of the yellow rollers between the blue outter disk and the green inner disk.
Clockwise rotation of the blue outter disk can not be transmitted to the pink fork.

2. When the fork is driving, its rotation of both directions is transmitted to the green inner disk by flexible contact via yellow rollers, red bushes and springs (for clockwise direction) or by direct contact between the fork and the green inner disk (for anticlockwise direction).
The rotation can not transmitted to the blue outter disk because the wedging does not happen.

3. When the green inner disk is driving, its clockwise rotation is transmitted to the blue outter disk by wedging of the yellow rollers between the blue outter disk and the green inner disk. Anticlockwise rotation of the green inner disk can not be transmitted to the blue outter disk.
The rotation of the green inner disk is transmitted to the pink fork by flexible contact via springs, red bushes and yellow rollers (for anticlockwise direction) or by direct contact between the green inner disk and the fork (for clockwise direction)