Montres Breguet S.a.

The Swatch Group Research and Development Ltd

Rene Piguet

Marc Stranczl

Benoit Junod

Polychronis Nakis Karapatis

Gianni Di Domenico

Davide Sarchi

Benoit Legeret

Sylvain Marechal

A timepiece movement includes a magnetic escapement formed of a magnetic escape wheel with an annular magnetized structure and a pallet fork whose shaft is formed by a ferromagnetic material. The pallet shaft exerts on the escape wheel a magnetic disturbance torque due to the fact that the annular magnetized structure exhibits an angular variation of at least one defining physical parameter thereof, such that the magnetic attraction varies as a function of the angular position of the escape wheel and has a tangential component. A magnetic compensation pin is incorporated in the timepiece movement, this magnetic compensation pin being arranged such that the second magnetic disturbance torque that it exerts on the escape wheel exhibits an angular phase shift relative to the first magnetic disturbance torque generated by the pallet shaft, so as to compensate largely for this first magnetic disturbance torque.

Timepiece movement comprising a rotating element provided with a magnetized structure having a periodic configuration

A dynamic chronometric testing of a movement or of a watch, control device fine controlling a predefined or random cycle of movements via standardised chronometric testing positions, the rate parameters are also measured in dynamic positions where the acceleration and velocity are different to zero and which correspond to additional dynamic chronometry criteria, defined to qualify the rate during a continuous movement applied to the movement or respectively to this watch.

Dynamic chronometric testing

A device that tests the chronometric precision of a watch movement or a watch includes a control device controlling a predefined cycle of motions passing through standard chronometric test positions, and a fine control device including a sequencer arranged to control the changes of chronometric test position of this movement, or respectively of this watch, in a multi-position sequence, after each measurement per position, and to start another multi-position sequence as soon as the preceding sequence finishes and which observes the predefined total duration of one cycle of several successive multi-position sequences. This sequencer is also arranged to manage the rate stabilisation durations, durations of measurement per position, and multi-position sequence durations.

Chronometric testing device

A barrel includes a mainspring cooperating internally with a core, externally with a track of a drum by way of a resilient sliding bridle. The track and the bridle are of non-circular shape, nesting one inside the other in the free state of the bridle. The track and the bridle are arranged to make one raised portion of the bridle abuttingly engage with a sill of the track when the torque applied to the bridle is less than a torque limit value, and to allow radial constriction of the raised portion when the torque is greater than the limit value. The track and the bridle are arranged to allow the passage of the raised portion over the sill and to allow the bridle to travel angularly under the effect of the torque until the next encounter between the sill and the raised portion.

Timepiece barrel with improved transmission of force

The invention concerns a method for adjusting the vibration frequency range of a sound producing device with vibrating tongues. The device includes an assembly formed of a comb extended by at least one vibrating tongue, said comb having at least one hole for the securing thereof to a support by means of a support jaw and of a tightening element traversing the support jaw and the hole in the aforecited comb. According to the method, the frequency range is adjusted by reducing the free length of the vibrating tongue or tongues by the localized clamping of said tongues between the support jaw and a local counter-support.

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Cheseaux-sur-Lausanne, Switzerland

Rene Piguet