The invention relates to a balance-spring stud-holder for a mechanical timepiece movement, which comprises a pair of tabs, namely a front tab and a rear tab, jointly defining a notch, the tabs being arranged in such a way that a balance-spring stud can be held in the notch, wherein the rear tab of the balance-spring stud-holder comprises an extension which defines, beyond the notch, a bend forming a retaining abutment for the balance-spring stud after said balance-spring stud has been extracted from the notch.

The invention relates to a balance-spring stud-holder for a mechanical timepiece movement, which comprises a pair of tabs, namely a front tab and a rear tab, jointly defining a notch, the tabs being arranged in such a way that a balance-spring stud can be held in the notch, wherein the rear tab of the balance-spring stud-holder comprises an extension which defines, beyond the notch, a bend forming a retaining abutment for the balance-spring stud after said balance-spring stud has been extracted from the notch.

A device for assembling and adjusting a balance spring, including a base joined to a balance bridge with an adjustable angular orientation, and having a bearing surface and a bearing plate adjacent to the bearing surface, both defining a service position of the end turn of the balance spring. A first arm extends from the base and bears a locking member for the end turn, the locking member being designed to keep the terminal coil in abutment against the bearing surface. A second arm of the device extends from the base and bears a shoe that is able to be arranged at a predefined distance from the bearing surface so as to cooperate with the end turn. A movable control member is able to act on the second arm in order to deform it elastically and move the shoe with respect to the base in order to free the end turn.

A device for assembling and adjusting a balance spring, including a base joined to a balance bridge with an adjustable angular orientation, and having a bearing surface and a bearing plate adjacent to the bearing surface, both defining a service position of the end turn of the balance spring. A first arm extends from the base and bears a locking member for the end turn, the locking member being designed to keep the terminal coil in abutment against the bearing surface. A second arm of the device extends from the base and bears a shoe that is able to be arranged at a predefined distance from the bearing surface so as to cooperate with the end turn. A movable control member is able to act on the second arm in order to deform it elastically and move the shoe with respect to the base in order to free the end turn.

The present invention concerns an assembly for holding or supporting a timepiece balance spring, comprising a balance spring stud and a balance cock on which is fixed a balance spring stud-holder, wherein said stud-holder comprises a holding means provided with a housing for housing the balance spring stud therein and a gripping means, at least said gripping means being movable with respect to the holding means in order to lock the balance spring stud inside its housing.

Timepiece movement (300) including a regulating system (150) and an adjustment device (200), the regulating system (150) having a frame (6), an assembled balance (4) pivoted in relation to the frame (6) about a geometric axis (A4) and having movable screws or inertia blocks (43a, 43b and 44a, 44b) for adjusting the inertia of the assembled balance (4), an elastic return system (1, 2, 3) intended to link the assembled balance (4) to the frame (6) so that the assembled balance (4) and the elastic return system (1, 2, 3) form an oscillator (100), the elastic return system (1, 2, 3) having a first elastic return element in the form of a first hairspring (1) having a first stiffness k1, a second elastic return element (2) having a second stiffness k2, and a third elastic return element (3) having a third stiffness k3, the first elastic return element (1) and the second elastic return element (2) being assembled in series between the assembled balance (4) and the frame (6), and the third elastic return element (3) and the second elastic return element (2) being assembled in parallel between the frame (6) and the first elastic return element (1).

A device (6) for autonomous adjustment of the active length of a spiral (5), for a balance-spiral type oscillator (4, 5), including a cock (12) mounted on a plate (13) of a horological movement (2) and in which a balance shaft pivots, the spiral (5) including an inner end secured to the balance shaft and an outer end secured to a balance spring stud (8) fastened to a balance spring stud holder (10), the balance spring stud holder (10) being pivotably mounted on the cock (12) concentrically with the balance shaft, and means for modifying the active length of the spiral (5).

A device (6) for autonomously adjusting the active length of a balance spring (5), for an oscillator (4, 5) of the sprung balance type, including a cock (12) mounted on a plate (13) of a horological movement (2) and in which cock a balance staff pivots, the balance spring (5) including an inner end integral with the balance staff and an outer end integral with a first stud (8) fastened to a stud-holder (10), the stud-holder (10) being pivotally mounted on the cock (12) concentrically with the balance staff, and means for modifying the active length of the balance spring (5).

A device (6) for autonomous adjustment of the active length of a spiral (5), for oscillators (4, 5) of the balance-spiral type, comprising a cock (12) mounted on a plate (13) of a horological movement (2) and in which a balance shaft pivots, the spiral (5) including an inner end secured to the balance shaft and an outer end secured to a balance spring stud (8) fastened to a balance spring stud holder (10), the balance spring stud holder (10) being pivotably mounted on the cock (12) concentrically to the balance shaft, and means for modifying the active length of the spiral (5).

A device (6) for autonomously adjusting the active length of a balance spring (5), for an oscillator (4, 5) of the sprung balance type, including a cock (12) mounted on a plate (13) of a horological movement (2) and in which cock a balance staff pivots, the balance spring (5) including an inner end integral with the balance staff and an outer end integral with a stud (8) fastened to a stud-holder (10), the stud-holder (10) being pivotally mounted on the cock (12) concentrically with the balance staff, and means for modifying the active length of the balance spring (5).