Patent ID: 7420883

Claim:
A timepiece movement comprising a going train, and a mechanism having a first cinematic connection with said going train and arranged to drive an indicator member in a stealthy rotational movement, said movement being activated periodically, with a predefined period, said mechanism also comprising a first wheel-and-pinion unit comprising a first wheel at least indirectly in engagement with said going train, a second wheel-and-pinion unit mounted coaxially with said first wheel-and-pinion unit, having at least one stop region and a second wheel, these being integral in rotation, while a second cinematic connection connects said second wheel to said indicator member, an elastic member connecting said first wheel-and-pinion unit to said second wheel-and-pinion unit in such a way that its degree of tension is a function of respective angular positions of said first and second wheel-and-pinion units, and locking means designed to engage with said stop region of said second wheel-and-pinion unit to prevent the latter from rotating between two successive movements of said indicator member, said first wheel-and-pinion unit further comprising a cam coaxial with and fixed to said first wheel and designed to act on said locking means, in each period, in order to release them momentarily and permit stealthy rotation of said second wheel-and-pinion unit through a predefined angle, under action of said elastic member, and said mechanism also comprising a retarding device acting on said second wheel-and-pinion unit in such a way as to limit its speed of stealthy rotation.