A magnetic device which rotates Arber, a rotation member in a movement for timepieces

Title:

A magnetic device which rotates Arber, a rotation member in a movement for timepieces

Document Type and Number:

Japanese Patent JP6114858

Kind Code:

B2

Abstract:

The device for pivoting an arbor of a rotating member, on a determined pivot axis, inside a timepiece movement includes at least one magnetic bearing including a magnet which exerts a force of attraction on a pivot made of magnetic material, of the arbor, and an endstone arranged between the magnet and the pivot, the endstone being formed of a material having a hardness greater than 500 HV and a friction coefficient less than or substantially equal to 0.1 with the material of which the pivot is made. The material forming the endstone has a high magnetic permeability and the endstone has, in cross-section to the pivot axis, smaller dimensions than those of the magnet, said endstone being arranged in the timepiece movement to be centred on the determined pivot axis.

Inventors:

Sylvain Marechal
Benoit rugere

Application Number:

JP2016103929A

Publication Date:

April 12, 2017

Filing Date:

May 25, 2016

Export Citation:

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