Abstract:
To provide a timepiece balance with hairspring capable of changing the moment of inertia of the balance wheel without involving generation of a one-sidedness in weight. There is provided a balance with hairspring including a balance staff, and a balance wheel arranged around the balance staff, wherein there are provided a first rim constituting the balance wheel and having a guide portion configured to vary in the distance from the balance staff in correspondence with a peripheral direction around the balance staff, an elastic portion arranged so as to be slidable along the guide portion and capable of elastic deformation in the radial direction around the balance staff, and a second rim having a plurality of weight portions arranged in the peripheral direction.
Abstract:
Provision of an operation stabilization mechanism, a movement, and a mechanical timepiece capable of stabilizing the operation of the balance with hairspring while preventing a change in the oscillation cycle of the balance with hairspring due to the gravitational force even in the case where a constant-force device is provided. An operation stabilization mechanism includes: an outer carriage 33 to which a drive force of a train wheel is transmitted and which is rotatably supported with respect to a main plate; an inner carriage 34 rotatably supported with respect to the outer carriage 33; a constant-force spring provided between the outer carriage 33 and the inner carriage 34 and imparting a rotational force to the inner carriage 34 so that the inner carriage 34 may rotate with respect to the outer carriage 33; and an escapement mechanism 102 mounted in the inner carriage 34 and configured to be driven through rotation of the inner carriage 34.