| 摘要 |
This escapement comprises a balance wheel fastened to an impulse element (7a), an escape wheel (1), a detent swing-arm (2) having a stop element (2a) and a disengagement element (2b), a disengagement finger (11d), constrained to rotate with the balance wheel, to come into engagement with the disengagement element (2b) of the detent swing-arm (2) once per oscillation period of the balance wheel. The disengagement finger (11d) is fastened to an inertial member (11) mounted to move freely between two extreme positions in one of which the trajectory of the disengagement finger (11d) passes through the disengagement element (2b) of the swing-arm (2) and in the other of which this trajectory does not pass through this disengagement element (11b), the passage of the inertial member (11) from one position to the other resulting from the inertia force caused by the variations of speed of the balance wheel in each alternation of oscillation of the balance wheel.
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