The Set Bridge

Reference no 445



The Set Bridge (445) can have a very different shape in different watch movements. The Set Bridge often works as the detent function for the Set Lever, see the notch in the top of the narrow arm. This function is the one that gives the winding knob its distinctive two positions: wind and set.



In this figure the Set Bridge is in place, with the winding knob in the winding position. The mechanical watch is wound up in the winding position, with the winding knob pushed in. In this position the Clutch Wheel is pushed towards the right by the Clutch Lever. The detent is in its outer position. The Set Bridge also keeps the Minute Wheel in place.



  In the hand setting position, with the winding knob pulled out, the Set Lever gives the Clutch Lever a force, which in turn pushes the Clutch Wheel to the left. This movement disengages the Clutch Wheel from the Winding Pinion and instead engages the Set Wheel, see figure above. The detent is here in its inner position.