Mechanism for advancing a karussel cage or tourbillon cage by periodic jumps

A mechanism for advancing, by periodic jumps, a pivoting cage, said cage carrying an escape wheel and an escape pinion in addition to a pallet lever cooperating with said escape wheel and with a sprung balance, said mechanism comprising:

• a pivoting retaining means arranged to cooperate with said cage to authorize or to prevent the pivoting of said cage, depending on whether said retaining means is pivoting or stopped;
• a pivoting stopping means arranged to cooperate with said retaining means to authorize or prevent the pivoting of said retaining means, according to the angular pivoting position of said pivoting stopping means;
• and wherein:
• said retaining means and said stopping means are carried by said cage;
• said mechanism includes a constant force device which causes the periodic and direct cooperation between said retaining means connected by a direct mechanical connection to the input of said device, and said stopping means connected by a direct mechanical connection to the output thereof, a trajectory of said retaining means interfering with that of said stopping means to pivot said cage when said stopping means allows the pivoting of said retaining means, and to stop said cage when said stopping means locks said retaining means;
• said retaining means includes a flirt at an input of said constant force device, said flirt being arranged to perform complete revolutions, and wherein said stopping means includes a star wheel at an output of said constant force device, the trajectory of said star wheel interfering with that of said flirt, to pivot said cage when said star wheel releases said flirt and otherwise to stop said cage.