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.

There is provided a hairspring including a main body portion that extends around a central axis along an Archimedes curve; an outer end curve portion that extends along a circumferential direction around the central axis on an outer side in a radial direction from the main body portion; and a reformed portion including a first bent portion that connects the main body portion and the outer end curve portion to each other and is bent outward in the radial direction from a tangent line of the Archimedes curve in a first connection portion with the main body portion, and a second bent portion bent inward in the radial direction from the outer end curve portion in a second connection portion with the outer end curve portion, and in which at least one is curved of the first bent portion and the second bent portion.

The mechanical timepiece regulator of the invention comprises a flexure bearing oscillator and a double detent escapement, the oscillator comprising a balance wheel (1) connected to an elastic suspension (2a, 2b) arranged to guide and apply a restoring force to the balance wheel (1) in a plane of oscillation. The escapement comprises an escape wheel (3) and an anchor (4) integrated into the balance wheel (1) and having two arms (5, 6) arranged to receive alternately the impulses of the escape wheel (3). The escapement furthermore comprises two detents (7, 8) alternately locking the escape wheel (3) between two impulses and interacting with the arms (5, 6) of the anchor to release the escape wheel (3) before each impulse, without direct interaction between the anchor and the escape wheel.

A balance spring (1) intended to be fitted to a timepiece balance having fixed inertia, the balance spring (1) being formed of a core (10) having lateral faces (10c) connecting an upper face (10a) to a lower face (10b), the balance spring (1) including on one of the lateral faces (10) in one portion of the outer coil (5), a coating formed of one or more layers, the coating including two layers with a first electrically conductive layer (12) coated with a second outer layer (13) made of a ceramic, or a combined layer (13), made of an electrically conductive ceramic. Also a method of manufacturing this balance spring.

A timepiece resonator mechanism includes a structure carrying, via a flexible suspension system, an anchor unit to which is suspended an inertia element oscillating about a pivot axis extending in a first direction Z, in a first rotational degree of freedom RZ, under the action of the return forces of a flexure pivot including longitudinal elastic strips each fixed to this inertia element and to this anchor unit. The flexible suspension system includes, between the anchor unit and a first intermediate mass directly or indirectly fixed to the structure, a transverse translation table with a flexure bearing and including transverse strips or transverse flexible shafts which are rectilinear and extend in this second direction X orthogonal to the first direction Z and symmetrically around a transverse axis crossing this pivot axis.

A balance of a timepiece including an adjustment face provided with at least one recess provided for receiving a projected material for an implementation of an adjustment of the rate of the timepiece notably by the modification of the inertia and of the unbalance of the balance, the recess including an opening and a back notably a solid back or a back fully or partially forming an orifice, the back being at most partially visible from a position defined above the opening notably on a central axis of the opening.

A regulator device (200) for a watch movement has (a) an inertial element (11) of a resonator (10) of inertia I, pivoted about a first axis (A1) and inscribed within a cylinder of diameter D centered on the first axis; (b) an escapement mobile (30) of inertia I3, pivoted about a second axis (A3) and inscribed within a cylinder of diameter D3 centered on the second axis; and (c) a blocking member having (i) a first blocking lever mobile (20a) of inertia I2a, pivoted about a third axis (A2a) and inscribed within a cylinder of diameter D2a centered on the third axis; and (ii) a second blocking lever mobile (20b) of inertia I2b, pivoted about a fourth axis (A2b), inscribed within a cylinder of diameter D2b centered on the fourth axis, the axes (A3, A2a, A2b) contained within a cylinder centered on the first axis (A1) and of diameter D<D.

A timepiece includes a mechanical oscillator, formed by a balance and a piezoelectric balance spring, and a control device for controlling the frequency of the mechanical oscillator. This control device is arranged to be capable of generating time-separated control pulses, each including a momentary decrease in an electrical resistance applied by the control device between two electrodes of the piezoelectric balance spring relative to a nominal electrical resistance. The control device is arranged to be capable of applying a plurality of control pulses during each time of a series of distinct correction times or without interruption in a continuous time window, in order to respectively synchronize the mechanical oscillator at a correction frequency whose value depends on a detected positive or negative temporal drift or at a desired frequency for the mechanical oscillator.

A timepiece is provided with a mechanical movement which includes a mechanical resonator, a sensor detecting oscillations of the mechanical resonator, and a braking device arranged to generate braking pulses in response to a control signal provided by a control circuit associated with an auxiliary oscillator. The control circuit is arranged to be capable of detecting a negative or positive temporal drift in the oscillation of the mechanical resonator and to generate, in a correction period, in association with the braking device, when the temporal drift corresponds to at least a certain loss, a series of braking pulses which are applied to the mechanical resonator at a frequency FSUP in a given range of values which is preferably higher than a frequency FZ (N)=2.Math.F0c/N, F0c being a set point frequency for the mechanical resonator and N a positive integer number.

The resonator for a timepiece includes a support structure permitting mounting the resonator in a timepiece, a first and a second balance arranged to oscillate in the same plane, at least one first and second elastic element respectively connecting the first and second balances to the support structure, the configuration of the elastic elements determining two parallel elastic pivoting axes for the two balances, and the elastic elements forming a resilient element angularly returning each of the balances towards an inoperative position. The resonator further includes a strap coupling the first and the second balance. The points joining the strap to the first and the second balance respectively are located in the same plane parallel to the plane of oscillation of the balances. When the balances are in their inoperative position, these joining points are symmetrical with respect to a center of symmetry midway between the geometrical pivoting axes.