Abstract: 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).

Abstract: 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).

Abstract: 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).

Abstract: 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).

Abstract: A balance spring includes a strip of polygonal section wound on itself into several coils. At least one coil of the balance spring includes a coil spacer device including at least four stop members mounted on the same face and protruding from the thickness of the at least one coil of the strip. Each of the at least four stop members is arranged to enter into contact with the opposite face of another coil of the strip preventing the other coil from touching the at least one coil in the event of a shock.

Abstract: 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.

Abstract: A balance spring includes a strip of polygonal section wound on itself into several coils. At least one coil of the balance spring includes a coil spacer device including at least four stop members mounted on the same face and protruding from the thickness of the at least one coil of the strip. Each of the at least four stop members is arranged to enter into contact with the opposite face of another coil of the strip preventing the other coil from touching the at least one coil in the event of a shock.

Abstract: A method of improving the pivoting of a wheel set for a scientific instrument, including an arbor pivoting or oscillating about a wheel set axis, is provided. A static balancing of this wheel set is performed to bring the center of gravity onto this axis. A desired value is determined for the resulting unbalance moment of this wheel set about this axis, corresponding to a predetermined desired divergence between a first principal longitudinal axis of inertia of this wheel set, and this axis. This wheel set is set in rotation at a predetermined speed about this wheel set axis, and the resulting unbalance moment is measured with regard to this axis. An adjustment is made to the value of the resulting unbalance moment of this wheel set about this axis within a given determined tolerance with regard to this desired value.

Abstract: A timepiece escapement mechanism, including a balance having no roller and an escape wheel, between which impulses are transmitted by a flexible, single-piece mechanism, connected by at least one flexible strip to a fixed structure or to the wheel. Oscillation is maintained by a balance spring ending in a balance spring stud which is mobile during operation, and which is guided by a flexible guide member with flexible strips, and whose center of rotation is coaxial to the balance, the balance spring stud receiving a pin which is mobile in a cam path of the wheel. During the oscillations, the balance spring stud is moved relative to its locking position under action of force exerted by the balance spring, and the pin maintains and regulates the oscillation.

Abstract: Balance spring including, tangent to each other: a first inner coil at a first angle at the center and of decreasing section in a first ratio; a second coil at a second angle at the center and of constant section; a third coil at a third angle at the center and of increasing section in a third ratio; a fourth coil at a fourth angle at the center and of constant section; a fifth coil at a fifth angle at the center and of increasing section in a fifth ratio; a sixth outer coil at a sixth angle at the center and of increasing section in a sixth ratio. In a variant, a seventh more rigid segment deviates from this sixth coil. Movement including this balance spring. Watch including this movement.

Abstract: An escape mechanism including a flexible single-piece mechanism for transmission of impulses between an impulse pin of a balance, and teeth of an escape wheel. Each tooth includes a lever with a pin that can be actuated by a lifting piece, a low level of the wheel carrying the pins on a same level as stop members of a plate, and a high level carrying the lifting pieces. The impulse pin pivots a lever opposite thereto, either to cause the pin to cooperate in abutment with the second stop member, or to move the lifting piece thereof opposite the first stop member and to cause the pin to bypass the second stop member, allowing the wheel to rotate to a next tooth.

Abstract: Balance spring including, tangent to each other: a first inner coil at a first angle at the center and of decreasing section in a first ratio; a second coil at a second angle at the center and of constant section; a third coil at a third angle at the center and of increasing section in a third ratio; a fourth coil at a fourth angle at the center and of constant section; a fifth coil at a fifth angle at the center and of increasing section in a fifth ratio; a sixth outer coil at a sixth angle at the center and of increasing section in a sixth ratio. In a variant, a seventh more rigid segment deviates from this sixth coil. Movement including this balance spring. Watch including this movement.

Abstract: A method of improving pivoting of a wheel set for a scientific instrument, including an arbor pivoting or oscillating about a wheel set axis, the method including: static balancing of the wheel set to bring the center of gravity onto the axis; determining a desired value for the resulting unbalance moment of the wheel set about the axis, corresponding to a predetermined desired divergence between a first principal longitudinal axis of inertia of the wheel set, and the axis; setting the wheel set in rotation at a predetermined speed about the wheel set axis, the resulting unbalance moment is measured with regard to the axis; and adjusting a value of the resulting unbalance moment of the wheel set about the axis within a given determined tolerance with regard to the desired value.

Abstract: An escapement mechanism for a timepiece movement or timepiece including at least one balance and at least one escape wheel. A transmission of impulses between the balance and the escape wheel is achieved by a single-piece flexible mechanism including at least one feeler spindle cooperating with the escape wheel or, respectively, with the balance, and the single-piece, flexible mechanism is connected by at least one flexible blade to a fixed structure of the timepiece, or respectively to the escape wheel.

Abstract: Pallet lever for an escapement mechanism including a balance with a pin of a given pin radius and oscillating over a given radius of gyration, this pallet lever including two horns for cooperation with a pin of this type. These horns are symmetrical to each other relative to a median plane passing through a pallet lever pivot axis, and each includes a concave inner profile over a first radius of curvature greater than or equal to the sum of this radius of gyration and this pin radius, this concave inner profile being adjacent to a convex outer profile over a second radius of curvature less than or equal to the difference between this radius of gyration and this pin radius.

Abstract: Pallet lever for an escapement mechanism including a balance with a pin of a given pin radius and oscillating over a given radius of gyration, this pallet lever including two horns for cooperation with a pin of this type. These horns are symmetrical to each other relative to a median plane passing through a pallet lever pivot axis, and each includes a concave inner profile over a first radius of curvature greater than or equal to the sum of this radius of gyration and this pin radius, this concave inner profile being adjacent to a convex outer profile over a second radius of curvature less than or equal to the difference between this radius of gyration and this pin radius.

Abstract: An escape mechanism including a flexible single-piece mechanism for transmission of impulses between an impulse pin of a balance, and teeth of an escape wheel. Each tooth includes a lever with a pin that can be actuated by a lifting piece, a low level of the wheel carrying the pins on a same level as stop members of a plate, and a high level carrying the lifting pieces. The impulse pin pivots a lever opposite thereto, either to cause the pin to cooperate in abutment with the second stop member, or to move the lifting piece thereof opposite the first stop member and to cause the pin to bypass the second stop member, allowing the wheel to rotate to a next tooth.

Abstract: The oscillating weight for a self-winding watch mechanism is made by molding a plastic material charged with heavy metal particles. Moreover, the plastic material is also charged with fibers, wherein said fibers form between 1.5% and 7% of the total weight of the charged plastic material, and the density of the charged plastic material is greater than 8.

Abstract: An escapement mechanism for a timepiece movement or timepiece including at least one balance and at least one escape wheel. A transmission of impulses between the balance and the escape wheel is achieved by a single-piece flexible mechanism including at least one feeler spindle cooperating with the escape wheel or, respectively, with the balance, and the single-piece, flexible mechanism is connected by at least one flexible blade to a fixed structure of the timepiece, or respectively to the escape wheel.

Abstract: A timepiece escapement mechanism, including a balance having no roller and an escape wheel, between which impulses are transmitted by a flexible, single-piece mechanism, connected by at least one flexible strip to a fixed structure or to the wheel. Oscillation is maintained by a balance spring ending in a balance spring stud which is mobile during operation, and which is guided by a flexible guide member with flexible strips, and whose center of rotation is coaxial to the balance, the balance spring stud receiving a pin which is mobile in a cam path of the wheel. During the oscillations, the balance spring stud is moved relative to its locking position under action of force exerted by the balance spring, and the pin maintains and regulates the oscillation.