Magnetic device for pivoting an arbor in a timepiece movement

A device for pivoting an arbor about a determined pivot axis in a timepiece movement, including at least one magnetic bearing comprising a magnet arranged to exert a force of attraction on a pivot, made of magnetic material, of the arbor, wherein the bearing includes a magnetic flux centring structure, arranged between the magnet and the pivot, and a support for the centring structure, this centring structure including a peripheral portion and a central portion resiliently connected to the peripheral portion by at least one connecting element, the central portion being formed of a highly magnetically permeable material and, in cross-section with respect to the pivot axis, having smaller dimensions than those of the magnet;

• and wherein the peripheral portion is rigidly assembled to said support so that the central portion is centred on the determined pivot axis, said peripheral portion being forcibly inserted into a housing in the support and the central portion being thus connected to the support via the peripheral portion.