Watch comprising a movement, with a balance comprising a ring distinct from the balance rim, elastically fixed to a flange with respect to which this ring is movable in rotation to modify the position of inertia blocks elastically carried by the flange, each able to be indexed in different stable angular positions corresponding to a different inertia of the balance, the movement including an operating member movable between coupled and uncoupled positions which includes a stop means for immobilizing the rim in a coupled position, and a control means for rotating the ring to modify the position of the inertia blocks in the coupled position, the watch including a crown controlling the control means, a rotating coupling ring controlling the coupling/uncoupling of the operating member through contactless interaction with an external adjustment tool.

A regulating member (1) for a horological movement, including an inertial mass, for example a balance (23), a balance spring (25) including a wound ribbon (2) and an adjustor for adjusting the stiffness of the balance spring provided with a flexible element (5) arranged in series with the wound ribbon (2), the adjustor including a prestressing device (6) for applying a variable force or torque to the flexible element (5) in order to adjust the rate of the regulating member (1), the regulating member (1) including a system for actuating the prestressing device (6), the actuation system including an actuator (30) mechanically connected to the prestressing device (6), the actuator (30) being configured to perform, at least in part, a substantially linear, preferably rectilinear, displacement, in order to actuate the prestressing device.

A regulating member (1) for a horological movement, including an inertial mass, for example a balance (23), a balance spring (25) including a wound ribbon (2), and an adjustor for adjusting the stiffness of the balance spring, the regulating member (1) including a system for actuating the adjustor, the actuation system including an actuator (30) having a movable part (37) mechanically connected to the adjustor, and a regulator for regulating the actuator (30), the regulator having a pivoting control lever (45) with a pivot arm (69) and a support arm (71) cooperating with the movable part (37) of the actuator (30) in order to displace it mechanically.

A regulating member (1) for a horological movement, including an inertial mass, for example a balance (23), a balance spring (25) including a ribbon (2) wound in a plurality of coils, the regulating member including an actuation system for adjusting the rate of the regulating member (1), the actuation system including an actuator (30) mechanically connected to the balance spring (25), the displacement of the actuator making it possible to modify the rate of the regulating member, the actuator (30) including a hook (39) engaged with the balance spring (25), and the displacement of the actuator (30) making it possible to modify the stiffness of the balance spring (25).

An assembly for the removable attachment of a balance spring of a horological movement including a balance bridge, the assembly including the balance spring, a means of retaining the balance spring, and a removable locking part. The balance spring includes a coil winding which extends between a first free end of an inner first coil and a second free end of an outer last coil, the second free end including an attachment means in which the retaining means is engaged to ensure the removable attachment of the balance spring by its outer last coil. The attachment means is dimensioned so that, in a rest position, the balance spring is not in contact with the retaining means engaged in this attachment means, the locking part for the removable attachment of the second free end being engaged on the retaining means to lock the attachment means.

A microsystem for setting the rate of a timepiece oscillator, including a wheel/inertia block including an off-center unbalance and a toothing and arranged to pivot with respect to a base plate of the microsystem, which includes an actuator driving a first active click arranged to drive the toothing, and includes a device for stopping the toothing in position, wherein the actuator is a thermomechanical actuator arranged to convert a flow of light energy into a displacement of a distal end of the thermomechanical actuator, which carries a first active click or directly controls a movement of a first active click, and the microsystem is capable of incorporation in a watch including a crystal transparent to predetermined wavelengths ranges and allowing the passage of a light ray to regulate the microsystem.

A method adjusting oscillation frequency of a sprung balance assembly formed at random from balance springs and balance wheels. A production mechanism is set to limit a sample standard deviation of a single batch of balance springs to a predetermined maximum value, and to limit a sample standard deviation of a single batch of balance wheels to a predetermined maximum value within a given unbalance tolerance. The mean of the balance population is classified according to the mean of the balance springs, to obtain a difference corresponding to a maximum inertia decrease value of the balances, between extreme gaussian distribution values of balances and of balance springs. A random balance spring sample is taken from the single batch of balance springs and a random balance from among the single batch of balances. The inertia of the balance is adjusted according to a torque value of the balance spring sample.

A method of improving pivoting of a wheel set for a scientific instrument, including an arbor pivoting or oscillating about an axis, in which: static balancing of the wheel set is performed to bring the center of gravity onto the axis; a desired value is determined for resulting unbalance moment of the wheel set about the axis, corresponding to a predetermined divergence between a first principal longitudinal axis of inertia of the wheel set, and the axis; at a predetermined speed about the axis, the resulting unbalance moment is measured with regard to the axis; and an adjustment of the resulting unbalance moment is made within a given determined tolerance with regard to the desired value, and performed by machining both sides of a median plane including the two secondary axes of inertia of the wheel set.

An inertial mass (1) intended to be mounted on a regulating organ (10), particularly of a horological movement, the inertial mass being configured to be subjected to a rotary oscillation movement at a predetermined frequency, the inertial mass including a rigid main body (2), characterised in that it comprises a flexible inertial element (3) assembled with the main body (2), the flexible inertial element (3) being configured to modify the geometry of the inertial mass (1) according to the oscillation amplitude. Also, a regulating organ and a horological movement comprising such an inertial mass.

A microsystem for setting the rate of a timepiece oscillator, including a wheel/inertia block including an off-centre unbalance and a toothing and arranged to pivot with respect to a base plate of the microsystem, which includes an actuator driving a first active click arranged to drive the toothing, and includes a device for stopping the toothing in position, wherein the actuator is a thermomechanical actuator arranged to convert a flow of light energy into a displacement of a distal end of the thermomechanical actuator, which carries a first active click or directly controls a movement of a first active click, and the microsystem is capable of incorporation in a watch including a crystal transparent to predetermined wavelengths ranges and allowing the passage of a light ray to regulate the microsystem.