Driver wheel for the ratchet wheel (Mobile de rochet)
The driver wheel for the ratchet wheel (mobile de rochet) is a component part of the automatic winding mechanism of a mechanical watch. The reduction wheel is driven by the arm movement of the watch wearer though the oscillating weight and by the reversing wheel. Thus, the reduction wheel transmits the force onto the ratchet wheel mounted on the barrel arbor and winds up the mainspring. This ensures the winding up of the watch.