A balance spring system of a horology movement, comprising: a balance spring (1); a movement blank; a first element (1c) for indexing the position of an outer end (10) of the balance spring relative to the blank; and a unit (OL) for connection of the outer end (10) of the balance spring to the movement blank,
the first indexing element (1c) being designed such as to be displaceable relative to the connection unit (OL).

A device for autonomous adjustment of the active length of a balance spring includes a regulator mounted on a plate with a cock, a balance spring stud holder being pivotally mounted on the cock, the regulator being pivotally mounted on the stud holder and including a pivot arm and device for changing the active length of the balance spring by pivoting the regulator. The device includes an elastic stress device to exert an elastic, return-to-position action on the regulator, and an inertia block, mounted for free rotation on the cock and connected to the pivot arm of the regulator, arranged to move the pivot arm of the regulator between a rest position and a correction position of the device, and simultaneously act on the device for changing the active length of the balance spring.

A device for autonomous adjustment of the active length of a balance spring includes a regulator mounted on a plate with a cock, a balance spring stud holder being pivotally mounted on the cock, the regulator being pivotally mounted on the stud holder and including a pivot arm and device for changing the active length of the balance spring by pivoting the regulator. The device includes an elastic stress device to exert an elastic, return-to-position action on the regulator, and an inertia block, mounted for free rotation on the cock and connected to the pivot arm of the regulator, arranged to move the pivot arm of the regulator between a rest position and a correction position of the device, and simultaneously act on the device for changing the active length of the balance spring.

A timepiece rotating regulator mechanism for regulating the rotational speed of a mechanism subjected to the action of a motor device through a transmission device, including an oscillator mechanism indirectly connected to the transmission device by a movement transformation device including a connecting-rod-crank-handle system, with a crank-handle rotated about a crank-handle axis by the transmission device, and a connecting-rod angularly moveable on the one hand in relation to the crank-handle, and on the other hand in relation to an inertial mass that this oscillator mechanism includes, to ensure the maintenance of the oscillator mechanism by the energy supplied by the motor device, and to ensure the speed regulation of a train that the transmission device include in relation to the frequency of the oscillator mechanism.

A fixing device for adjusting the clearance of a balance. At least one fixing device including at least one stud holder, at least one bearing body, at least one support member and at least one holding member. At least one bearing body is configured to move relative to at least one stud holder so as to fix the adjustment of the clearance of the balance and at least one support member is configured to press at least one bearing body against at least one stud holder before being held by at least one holding member.

A fixing device for adjusting the clearance of a balance. At least one fixing device including at least one stud holder, at least one bearing body, at least one support member and at least one holding member. At least one bearing body is configured to move relative to at least one stud holder so as to fix the adjustment of the clearance of the balance and at least one support member is configured to press at least one bearing body against at least one stud holder before being held by at least one holding member.

A mechanical watch including an in-plane oscillator (1) with a tuning mass (2), the oscillator (1) including a receptacle (3) for the tuning mass (2), the tuning mass (2) having a first portion (2′) snugly fitting in the receptacle (3), a second portion (2″) with a thickness that is equal or substantially equal to a thickness of the first portion (2′), and a length as seen at right angles with reference to said thickness that is substantially greater than said thickness so as to provide that the tuning mass (2) is substantially planar and extends outside the receptacle (3) in a plane substantially perpendicular to the plane of the oscillator (1).

A mechanical watch including an in-plane oscillator (1) with a tuning mass (2), the oscillator (1) including a receptacle (3) for the tuning mass (2), the tuning mass (2) having a first portion (2′) snugly fitting in the receptacle (3), a second portion (2″) with a thickness that is equal or substantially equal to a thickness of the first portion (2′), and a length as seen at right angles with reference to said thickness that is substantially greater than said thickness so as to provide that the tuning mass (2) is substantially planar and extends outside the receptacle (3) in a plane substantially perpendicular to the plane of the oscillator (1).

A regulator key whose arms ensure clearance of a balance spring even in event of shocks.

Provided are a regulator capable of further improving time measurement accuracy as compared with the related art, and a movement and timepiece including the regulator. A regulator includes a regulator pin. The regulator pin includes a pair of regulator pin main bodies and a regulator pin base portion. The regulator pin base portion is formed integrally with the pair of regulator pin main bodies and is held by a regulator body. The regulator pin main bodies are disposed so as to sandwich an outer end portion of a hairspring and contain zirconia. In the regulator pin, by extrusion molding, an outer peripheral surface and an inner peripheral surface of the regulator pin are formed, and the regulator pin main body and the regulator pin base portion are integrally formed.