Timepiece including a generator
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United States of America Patent
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Jan 13, 2004
Grant Date -
Sep 26, 2002
app pub date -
Mar 18, 2002
filing date -
Mar 20, 2001
priority date (Note) -
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Abstract
The timepiece includes a time base (13), a generator (1) formed in particular of a rotor (2) with permanent magnets and at least one coil (3), a barrel (6) with a mainspring coupled to said generator in order to drive it, analogue time indicating means (7) also driven by said barrel. These time indicating means operate substantially synchronously relative to said time base as long as the torque C.sub.B provided by said barrel is greater than or equal to a minimum synchronisation torque C.sub.SYNC. The timepiece also includes means (12, 16) for braking said generator, magnetised means (18) having with the rotor, when the generator is stopped, a static positioning torque C.sub.P 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.sub.P is greater than or substantially equal to a reference torque C.sub.REF for which the torque C.sub.B exerted by the barrel on the rotor is equal to said minimum synchronisation torque C.sub.SYNC.
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