A timepiece rotating regulator mechanism for regulating the rotational speed of a mechanism subjected to the action of a motor device through a transmission device, including an oscillator mechanism indirectly connected to the transmission device by a movement transformation device including a connecting-rod-crank-handle system, with a crank-handle rotated about a crank-handle axis by the transmission device, and a connecting-rod angularly moveable on the one hand in relation to the crank-handle, and on the other hand in relation to an inertial mass that this oscillator mechanism includes, to ensure the maintenance of the oscillator mechanism by the energy supplied by the motor device, and to ensure the speed regulation of a train that the transmission device include in relation to the frequency of the oscillator mechanism.