Electric power generation device for timepiece

A time-limited power generation device for a timepiece, including a manoeuvring member manoeuvrable by a user against at least one elastic return means arranged to drive indirectly at least one electric generator for generating an electric current for a limited period,

• wherein said device includes a toothed member movable with a degree of freedom relative to said manoeuvring member and delimiting with said manoeuvring member a separate chamber for receiving each said elastic return means, which said elastic return means is held compressed in its said chamber between a pre-stressed position of rest and a position of maximum compression, between a first support banking that includes said manoeuvring member and a second support banking that includes said toothed member,
• wherein said toothed member is arranged to be driven by said at least one elastic return means for driving said electric generator directly or indirectly through a geartrain,
• wherein said manoeuvring member, said at least one elastic return means, and said toothed member, are movable in rotation about a common main axis, and
• wherein said manoeuvring member is a movable bezel mobile relative to a middle.