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AssigneeThe Swatch Group Research and Development Ltd
InventorsRudolf DINGER, Jean-Pierre MIGNOT, Jean-Jacques BORN
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The present invention concerns regulating members for a mechanical timepiece, specifically a system based on the magnetic interaction between a resonator, in the form of a tuning fork for example, and an escape wheel, called a “magnetic escapement”. The system is characterized in that there are several areas of magnetic interaction between the resonator and the escape wheel which are arranged such that the torques produced at the escape wheel by these interactions compensate each other if the escape wheel is not synchronized at the frequency of the resonator. This results in negligible torque in the escape wheel when the latter rotates slowly in the direction of the arrow or the opposite direction. This allows the timepiece to start with a low mainspring torque and without any start procedure or device and provides better resistance of the timepiece against a loss of synchronization in the event of a shock.
A system for regulating a mechanical timepiece based on the magnetic interaction between a resonator and an escape wheel, said interaction creating radial and tangential forces acting on the escape wheel and generating torques therein, characterized in that the system is arranged so that the torques due to said tangential forces act in opposite directions and cancel each other out when the resonator is stationary and a torque is applied to the escape wheel.
The regulating system according to any of the preceding claims, wherein the resonator carries means for adjusting the chronometric frequency in the form of adjustable inertia blocks arranged on the resonator structure or areas arranged to be removed by ablation.
The timepiece movement including a regulating system according to any of the preceding claims.
Dependencies are inferred from the claim text.