This is the autowinding system of seiko watches. It is known as the “magic lever system” since it was built according to the structure of the train wheel system. With this configuration, it allows the ratchet wheel to rotate in a desired direction no matter which direction the oscillating weight is turned. Such design greatly enhances the efficiency of energy saving that is done by converting the kinetic energy from human’s moving to the potential energy storing in the mainspring inside the watch.
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