The timepiece mechanism comprises a rotating wheel set, a support element, a pivoting member mounted on the support element and magnetic return means for returning one portion of the pivoting member against a surface of the rotating wheel set. The return means comprise a first magnet carried by the pivoting member and a second magnet carried by the support element. The first and second magnets are arranged such that, in normal operation, the interaction of their respective magnetic fields generates a magnetic force oriented to return said pivoting member portion towards said rotating wheel surface. At least one of the first and second magnets is arranged to permit reversal of its polarity, preferably with the aid of a tool, and thereby of the direction of the magnetic force acting on the pivoting member, said magnetic force then tending to move said pivoting member portion away from said rotating wheel set surface, which makes it easy to handle the various elements of the timepiece mechanism.

A method of manufacturing a wheel includes an outer shape formation process in which etching is performed on a silicon wafer made of a brittle material to form the wheel including a plurality of teeth, a frame portion that is disposed outside the wheel, and a coupling portion that is more flexible than the teeth and couples the frame portion to a leading end portion of a corresponding one of the teeth, and a cutting process in which the coupling portion and the wheel are cut.

The timepiece mechanism comprises a rotating wheel set, a support element, a pivoting member mounted on the support element and magnetic return means for returning one portion of the pivoting member against a surface of the rotating wheel set. The return means comprise a first magnet carried by the pivoting member and a second magnet carried by the support element. The first and second magnets are arranged such that, in normal operation, the interaction of their respective magnetic fields generates a magnetic force oriented to return said pivoting member portion towards said rotating wheel surface. At least one of the first and second magnets is arranged to permit reversal of its polarity, preferably with the aid of a tool, and thereby of the direction of the magnetic force acting on the pivoting member, said magnetic force then tending to move said pivoting member portion away from said rotating wheel set surface, which makes it easy to handle the various elements of the timepiece mechanism.

Disclosed is a gear assembly, including: a shaft with a gearwheel; a tube into which the shaft is inserted; and a washer interposed between the shaft and the tube in an axial direction of the shaft, wherein the washer has a higher hardness than the tube.

Disclosed is a gear assembly, including: a shaft; a spur gear that is made of a material having a crystal lattice plane and through which the shaft is inserted; and a fixing member that fixes the spur gear to the shaft.