MAGNETIC DEVICE FOR CENTRING A SHAFT IN A CLOCKWORK MOVEMENT

A magnetic device for centring a shaft on a predetermined axis in a clockwork movement includes at least one first magnetic bearing provided with a magnet to exert an attractive force on a first ferromagnetic end pivot of the shaft. The first magnetic bearing includes a central part made of soft fer...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Legeret, Benoit, ROCHAT, Jean-Philippe
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING ELECTROMECHANICAL CLOCKS OR WATCHES ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HOROLOGY LIGHTING MECHANICAL ENGINEERING MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL MECHANICALLY-DRIVEN CLOCKS OR WATCHES PHYSICS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS WEAPONS
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Beschreibung
Zusammenfassung:	A magnetic device for centring a shaft on a predetermined axis in a clockwork movement includes at least one first magnetic bearing provided with a magnet to exert an attractive force on a first ferromagnetic end pivot of the shaft. The first magnetic bearing includes a central part made of soft ferromagnetic material mounted between the magnet and the first end pivot of the shaft. The central part is positioned centrally in a washer made of non-magnetic material so as to centre the magnetic field flux generated by the permanent magnet through the central part in order to magnetically attract the first end pivot of the shaft on the predetermined axis. The diameter of the central part can be identical to, or 0 to 20% less than, or 0 to 20% greater than, the diameter of the first end pivot.