Eta Sa Fabriques D'ebauches

Fr&eacute;d&eacute;ric Leuba

Denis Burdet

Florian Serex

The timepiece includes a time base ( ), a generator ( ) formed in particular of a rotor ( ) with permanent magnets and at least one coil ( ), a barrel ( ) with a mainspring coupled to said generator in order to drive it, analogue time indicating means ( ) also driven by said barrel. These time indicating means operate substantially synchronously relative to said time base as long as the torque C provided by said barrel is greater than or equal to a minimum synchronisation torque C . The timepiece also includes means ( ) for braking said generator, magnetised means ( ) having with the rotor, when the generator is stopped, a static positioning torque C allowing said rotor to be kept in a substantially stationary position. The generator braking means are activated as soon as the time indicating means are no longer operating in a substantially synchronised manner with the time base, and the magnetised means are arranged such that the static positioning torque C is greater than or substantially equal to a reference torque C for which the torque C exerted by the barrel on the rotor is equal to said minimum synchronisation torque C .

Growing community of inventors

La Chaux-de-Fonds, Switzerland

Frédéric Leuba

Growing community of inventors

La Chaux-de-Fonds, Switzerland

Fr&eacute;d&eacute;ric Leuba

Frédéric Leuba