Quartz analog watch movement with lavet-stepping motor and...

Details Quartz analog watch movement with lavet-stepping motor and... Quartz analog watch movement with lavet-stepping motor and...

G - Physics

04

C

58/13.1

G04C 3/00 (2006.01) G04B 29/02 (2006.01) G04B 31/016 (2006.01) G04C 13/11 (2006.01)

Patent

CA 1299378

PI-1141-H. Schwartz QUARTZ ANALOG MOVEMENT WITH LAVET STEPPING MOTOR AND LARGE ENERGY CELL ABSTRACT OF THE DISCLOSURE A movement for a three hand quartz analog timepiece has an energy cell supplying power to a timekeeping circuit which periodically steps the rotor of a Lavet type stepping motor. The stepping motor rotor drives a "seconds" wheel assembly attached to the "seconds" hand spindle through one or more intermediate wheel assemblies of gear, pinion, and spindle. A first intermediate wheel spindle of non-magnetic material is journaled such that its axis extends through the circumferential gap carrying magnetic flux between the rotor and the stator of the stepping motor. Several alternative means of journaling the first intermediate wheel assembly within the active flux gap of the stepping motor are shown and described, as well as movements having two intermediate wheel assemblies. The arrangement allows a small diameter "seconds" wheel and a relatively large energy cell, which provides a long running time for the movement.

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