A movement includes a tourbillion block, a tourbillion unit, and a zero reset mechanism. The tourbillion unit includes a carriage, a balance wheel, and an escape wheel. The balance wheel and the escape wheel are rotationally arranged on the carriage. The carriage is rotationally supported on the tourbillion block. The zero reset mechanism includes a first wheel in engagement with the escape wheel. The movement is switchable between a driving mode and a reset mode. When in the driving mode, the zero reset mechanism is rotationally locked to the tourbillion block. When in the reset mode, the zero reset mechanism is rotatable relative to the tourbillion block.

A movement includes a tourbillion block, a tourbillion unit, and a zero reset mechanism. The tourbillion unit includes a carriage, a balance wheel, and an escape wheel. The balance wheel and the escape wheel are rotationally arranged on the carriage. The carriage is rotationally supported on the tourbillion block. The zero reset mechanism includes a first wheel in engagement with the escape wheel. The movement is switchable between a driving mode and a reset mode. When in the driving mode, the zero reset mechanism is rotationally locked to the tourbillion block. When in the reset mode, the zero reset mechanism is rotatable relative to the tourbillion block.

A zeroing device 100 for a chronograph, comprising at least one zeroing heart 110, 120, a zeroing unit 200, which has a zeroing lever arm 210 and a zeroing lever bar 220, the first end 221 of which is designed to contact the zeroing heart 110, 120, and a control means 130 which interacts with the zeroing lever arm 210, wherein a zeroing of the zeroing unit 200 is effectuated by actuating the control means 130. This enables low production and maintenance costs and allows the counter hands to be reset to the zero position in a safer, more durable, and user-friendly manner. The zeroing device 100 comprises a first compression spring 140 which is supported on the zeroing lever arm 210 and is operatively connected to the control means 130, and the control means 130 interacts indirectly, via the first compression spring 140, with the zeroing unit 200.

Timepiece wheel set (1) including an arbor (3) carrying a wheel (4), and a heart cam (2) in an angularly indexed position with respect to the wheel (4), the heart cam (2) is freely mounted in a radial direction (R) with respect to the axis (D) of the arbor (3), and is returned in a neutral position towards the axis (D) by at least one flexible element (6), which is either a strip (25; 26) incorporated in the heart cam (2), or a spring (60) inserted between the wheel (4) and the heart cam (2), and the flexible element (6) is dimensioned to damp impacts applied to a peripheral cam track (23) comprised in the heart cam (2).