Abstract: A bearing (1a) for guiding a timepiece shaft about an axis, notably a guide bearing for a portion of a timepiece resonator shaft, comprising at least one pressing element (13a) arranged in such a way as to constantly exert an action on the shaft, radially or substantially radially with respect to the axis.

Abstract: A bearing (1a) for guiding a timepiece shaft about an axis, notably a guide bearing for a portion of a timepiece resonator shaft, comprising at least one pressing element (13a) arranged in such a way as to constantly exert an action on the shaft, radially or substantially radially with respect to the axis.

Abstract: A balance wheel for timepiece movement, which obeys the following condition: D5·f/I?20·10?2m3kg?1s?1 where D is the diameter of the balance wheel, f is the frequency and I is the moment of inertia.

Abstract: This Swiss lever escapement comprises an escape wheel having teeth, and a lever having on the one hand an entry pallet and an exit pallet that engage alternately with the teeth of the escape wheel, and on the other hand a fork that engages periodically with an impulse pin on a roller mounted on the staff of a regulator balance wheel. The relative width Lpl of each of said pallets, expressed as a percentage of the sum of the lengths of arc of one of said teeth and one of said pallets, measured at the circumference of the escape wheel is: Lpl = Ls Ls + d ? ? or ? ? Le Le + d ? 60 ? % where Ls and Le are the lengths of arc of the exit pallet and entry pallet, respectively, and d is the length of arc of one escape wheel tooth.

Abstract: A balance wheel for timepiece movement, which obeys the following condition: D5·f/I?20?2m3kg?1s?1 where D is the diameter of the balance wheel, f is the frequency and I is the moment of inertia.

Abstract: This Swiss lever escapement comprises an escape wheel having teeth, and a lever having on the one hand an entry pallet and an exit pallet that engage alternately with the teeth of the escape wheel, and on the other hand a fork that engages periodically with an impulse pin on a roller mounted on the staff of a regulator balance wheel. The relative width Lpl of each of said pallets, expressed as a percentage of the sum of the lengths of arc of one of said teeth and one of said pallets, measured at the circumference of the escape wheel is: Lpl = Ls Ls + d ? ? or ? ? Le Le + d ? 60 ? % where Ls and Le are the lengths of arc of the exit pallet and entry pallet, respectively, and d is the length of arc of one escape wheel tooth.