The first one is a double planetary drive where the input shaft provides turning capacity to the ring. This one and the input gear of the second planetary stage are coupled. Becouse of that, the input gear turns in opposite direction comparing the first input gear. In this second stage the ring is fixed, therefore the carrier turns at same direcction than input gear two.
We might consider that both carriers are fixed, the last one provides the torque and the first one the initial turning direction.
Gear scheme:
Turning directions:
Image 1:
Image 2( Rear view):
Same system, different application:
References:
Mechanism and Mechanical Devices Sourcebook
Images: Vergara
