Chronograph mechanism and timepiece comprising the chronograph mechanism

A chronograph mechanism for a timepiece comprising a watch movement, the chronograph mechanism comprising:

• a first sweep-hand mobile which is provided for carrying a first sweep hand for indicating a first measured time;
• a first brake configured to angularly immobilize the first sweep-hand mobile;
• a second sweep-hand mobile which is provided for carrying a second sweep hand for indicating a second measured time and which rotates on the same axis of rotation as the first sweep-hand mobile;
• a second brake configured to angularly immobilize the second sweep-hand mobile;
• an intermediate chronograph mobile which rotates on the same axis of rotation as the first and second sweep-hand mobiles and is arranged to transmit a drive from the watch movement to the first and second sweep-hand mobiles;
• a first return device configured to return the first sweep-hand mobile to a first predetermined angular position relative to the intermediate chronograph mobile in the absence of angular immobilization of the first sweep-hand mobile by the first brake;
• a second return device configured to return the second sweep-hand mobile to a second predetermined angular position relative to the intermediate chronograph mobile in the absence of angular immobilization of the second sweep-hand mobile by the second brake;
• and
• a control system including a coordination device which is arranged to maintain the first and second brakes in two alternative configurations, including,
• a first configuration in which the first brake is in an inactive state, thereby allowing the first sweep-hand mobile to rotate freely, and in which the second brake is in an active state, thereby angularly immobilizing the second sweep-hand mobile, and
• a second configuration in which the second brake is in an inactive state, thereby allowing the second sweep-hand mobile to rotate freely, and in which the first brake is in an active state, thereby angularly immobilizing the first sweep-hand mobile.