A chronograph mechanism includes an energy accumulator, a regulating system, and a gear train connecting the energy accumulator to the regulating system. The energy accumulator is formed by a strip-spring and includes a device for driving the gear train arranged to regulate the torque delivered by the strip-spring.

A chronograph mechanism includes an energy accumulator, a regulating system, and a gear train connecting the energy accumulator to the regulating system. The energy accumulator is formed by a strip-spring and includes a device for driving the gear train arranged to regulate the torque delivered by the strip-spring.

A horological movement (1) including a running train (100) driven by a first power source (150) and regulated by a regulating member (120); a chronograph mechanism (10) including a chronograph train (20) driven by a second power source (35) including a chronograph counter (23) having a counter wheel (231); a chronograph start/stop control device (30) configured to couple on demand the chronograph train (20) to the regulating member (120); a reset mechanism (40) for resetting said chronograph counter (23), including a reset control (60) movable between a neutral rest position and a reset position; the chronograph mechanism (10) including a lever (70) configured to be controlled by the chronograph start/stop control device (30) between a first stable position wherein the lever (70) blocks the rotation of the counter wheel (231) and a second stable position, wherein the counter wheel (231) is free to rotate.

A chronograph mechanism including an energy accumulator, a regulating system, a chronograph counter train including a minute-counter having a minute wheel set and at least one minute indicator member, and a seconds-counter having a seconds wheel set and a seconds indicator member, a chronograph zero-reset mechanism including a minute zero-reset mechanism. The minute zero-reset mechanism is arranged to cooperate with the minute wheel set, the minute indicator member being permanently integral with the minute wheel set, and the chronograph counter train includes an uncoupling device between the minute-counter and the seconds-counter, arranged to kinematically connect the minute wheel set and the seconds wheel set during the counting and to uncouple the seconds wheel set from the minute wheel set when the chronograph mechanism is reset to zero.