Constant-force escapement mechanism for timepiece movement

Constant-force escapement mechanism for a timepiece, comprising:

• an escape wheel having a plurality of teeth and arranged to sustain a hairspring-balance oscillator;
• a rearming wheel having a plurality of teeth and arranged to be driven in rotation by a drive source, said rearming wheel being connected to said escape wheel by means of a return element;
• a blocking lever pivotably mounted and arranged to move between stable first and second angular positions as a function of the rotation of said escape wheel, and to block and release said rearming wheel at the rate of one step of its rotation as said blocking lever moves from one of its stable positions to the other;
• wherein said escapement mechanism further comprises a control wheel mounted fixed in rotation to said escape wheel and angularly adjustable with respect to the latter, said control wheel having a plurality of teeth and being arranged to cooperate with said blocking lever in order to cause it to move between one of its stable positions and the other.

Constant-force escapement mechanism for a timepiece, comprising:

• an escape wheel having a plurality of teeth and arranged to sustain a hairspring-balance oscillator;
• a rearming wheel having a plurality of teeth and arranged to be driven in rotation by a drive source, said rearming wheel being connected to said escape wheel by means of a return element;
• a blocking lever pivotably mounted and arranged to move between stable first and second angular positions as a function of the rotation of said escape wheel, and to block and release said rearming wheel at the rate of one step of its rotation as said blocking lever moves from one of its stable positions to the other;
• wherein said blocking lever cooperates with a flywheel which is distinct from the hairspring-balance oscillator.