A gearing (E1) for a horological mechanism (100), comprising a first toothed wheel (R1) including first symmetrical teeth (d1) and a second toothed wheel (R2) including second symmetrical teeth (d2), each of the first and second teeth being conformed so that the primitive backlash (J) of the gearing is less than 0.3 .m, or even less than 0.25 .m, or even less than 0.2 .m, or even less than 0.15 .m, or even less than 0.1 .m, or even less than 0.08 .m for the nominal axial center distance (e) of the gearing, where m is the modulus of the wheel of which the tooth forms part.

Timepiece calendar device (100) including a first display disk (1) for displaying dates having a first face (11) bearing date indications (10) and mobile about an axis (A), and a second display disk (2) for displaying days having a second face (21) bearing day indications (20) and mobile about the axis (A), the first and second disks being such that the first and second faces are coplanar, the second face being disposed around the first face.

A system including two components intended to be in friction contact with each other in a given direction, wherein the friction occurs in a functional area, wherein the system is at least one of the two components including, on a surface in the functional area, a texture formed of a series of troughs of rounded shape separated by peaks or a series of bumps of rounded shape separated by troughs, the troughs extending parallel in the given direction and allowing for the evacuation of debris produced by friction and serving as a reservoir for a lubricant. A method for manufacturing at least one component or a mold by the DRIE (deep reactive ion etching) process, wherein surface defects on the sidewalls machined by the DRIE process are used to form the troughs.

An escape lever suppresses energy loss and provides strong resistance to external shocks. An escape lever has a pallet fork; a pallet formed in unison with the pallet fork for engaging the escape wheel; and a pallet staff that is a pivot of the pallet fork and passes through the pallet fork. The pallet has a locking surface that the locking corner of the escape wheel contacts in the unlocking period when the escape wheel is released by the pallet and freed to move. The locking surface is shaped so that the draw angle formed by a normal to the contact point with the locking corner of the escape wheel, and a line through the contact point and the axis of the pallet staff, remains constant during the unlocking period.

A device (100) for display of an indication of the time or derived from the time includes: a first display mobile unit (10) including a first toothing (11b), a second toothing (11c) and a first disk (12) carrying digits (13) intended to indicate the units of indication of time or derived from time; a second display mobile unit (20) including a third toothing (21b), a fourth toothing (21c) and a second disk (22) carrying digits (23) intended to indicate the tens of indication of time or derived from time; and a mechanism (90) for driving the first and second mobile that includes a command mobile unit (30) including a fifth toothing (30a) adapted to cooperate by obstacle, in particular by meshing, with the first and third toothings, and a second command mobile unit (40) including a sixth toothing (40a) adapted to cooperate by obstacle with the second and fourth toothings.

Timepiece calendar device (100) including a first display disk (1) for displaying dates having a first face (11) bearing date indications (10) and mobile about an axis (A), and a second display disk (2) for displaying days having a second face (21) bearing day indications (20) and mobile about the axis (A), the first and second disks being such that the first and second faces are coplanar, the second face being disposed around the first face.

A gearwheel (R2) for clock movement, suitable for cooperating with a given first gearwheel (R1), wherein it comprises teeth whose flank is defined such that the torque ratio j between the two meshed gearwheels (R1, R2) is constant at least over a given angular pitch.

A gear train mechanism of a timepiece is formed by a gear having an involute tooth profile, which is easily manufactured, and a pinion that meshes with the gear. In order to reduce a fluctuation in torque to be transmitted, a gear train mechanism of a timepiece includes a gear including a tooth having a tooth profile of an involute curve and a pinion including a tooth meshing with the tooth of the gear to transmit and receive a torque, wherein the torque to be transmitted from the gear to the pinion is substantially constant at least in a part of a first half of a meshing period of the gear and the pinion.

The invention relates to a display system for a timepiece, said system comprising a mobile arranged to be driven by a drive source by means of first teeth provided on the mobile. According to the invention, the mobile comprises at least second teeth including a teeth module of less than 0.05 mm, said second teeth being arranged so as to drive a display member either directly or indirectly.

Timepiece wheel with play take-up, including a toothing, each tooth of which includes first and second half-teeth each including a part of the tooth profile, and movable with respect to each other against elastic return means, the wheel including, axially stacked, a first and a second half-wheel respectively carrying the first and second half-teeth and having limited rotational mobility with respect to each other, about the axis of this toothing, and against the elastic return means, the toothing of each half-wheel overhanging the other half-wheel, each half-wheel including hollows inside each of which is movable an opposite half-tooth, between two successive half-teeth.