Optimized escapement

摘要

A timepiece escapement mechanism includes a stopper between a resonator and an escape wheel set. The wheel set includes a magnetized track with an angular period of travel over which its magnetic characteristics are repeated. The stopper includes a magnetized or ferromagnetic pole shoe that is mobile in a transverse direction relative to the direction of travel of an element of a surface of the track. The pole shoe or the track creates a magnetic field in a pole gap between the pole shoe and the surface. The pole shoe is opposite a magnetic field barrier on the track just before each transverse motion of the stopper commanded by the periodic action of this resonator. The stopper is multistable and arranged to occupy at least two stable positions.

主权项

1. An escapement mechanism for a timepiece, comprising:
a stopper between a resonator and an escape wheel set, wherein said escape wheel set includes at least one magnetized or ferromagnetic, or respectively, electrized or electrostatically conductive track with an angular period of travel over which the magnetic, or respectively, electrostatic characteristics thereof are repeated, said stopper including at least one magnetized or ferromagnetic, or respectively, electrized or electrostatically conductive pole shoe, said pole shoe being movable in a transverse direction relative to the direction of travel of at least one element of a surface of said track, and at least said pole shoe or said track creating a magnetic or electrostatic field in a pole gap between said at least one pole shoe and said at least one surface, wherein said pole shoe is confronted with a magnetic or electrostatic field barrier on said track just before each transverse motion of said stopper actuated by the periodic action of said resonator, wherein said stopper is multistable and arranged to occupy at least two stable positions, and wherein said magnetic or electrostatic field, created by said pole shoe or said track, in a pole gap between said at least one pole shoe and said at least one surface, generates a torque or force which is applied to said at least one pole shoe and said at least one surface, and further wherein said torque or force is a periodic braking torque or force according to said angular period of travel, with, starting from a null value for said torque or force, a first half-period including a ramp of potential wherein said braking torque or force is substantially constant around a first value, and a second part of the period including a barrier of potential wherein said braking torque or force increases and reaches the maximum value thereof which is a second value at least three times said first value and of the same sign as said first value.