|Site and movement overview|
In the figure
below you can see the 8 basic function blocks that constitute the
movement and how they are related to each other. We can
see the mainspring system followed by the accelerating wheel train to
the oscillator or balance system. Between the wheel train and the
balance system we find the escapement which is the function that both
regulates, in a precise way, the unwinding of the main spring and gives
the balance its necessary impulse, for each turn, to keep it swinging.
The mainspring is wound via a very clever system called the keyless works. It transmits the turn of the winding button to the mainspring. When the winding crown is pulled to its set position the keyless works connects with the motion works and the hands at the dial can be turned. In normal operation the hands are driven from the wheel train via the cannon pinion which is friction-fitted to the arbor from the wheel train. This friction fit allows the hands to turn when the movement is in the set mode.