Timepiece movement including an analogue display drive device

摘要

Timepiece movement including a date display drive device formed of a display disc including a toothing, said drive device including driving means and a drive source. The driving means includes a wheel set including pins, having a toothed wheel and a pinion including pins, and an engaging wheel engaging said toothed wheel. The pinion with pins includes a pair of pins configured to be positioned on either side of any tooth of the toothing. The toothed wheel of the pin wheel and the engaging wheel respectively have complementary non-circular profiles. When the two pins are oriented in a tangential direction to the toothing, these two wheels have a first gear ratio that is lower than a second gear ratio between them when the two pins are in perpendicular alignment to said tangential direction.

主权项

1. A timepiece movement comprising a device for driving an analogue display formed by a display disc including a toothing, the drive device including a drive source and driving means coupling said drive source to the toothing, said drive device including a wheel set including pins, formed of a toothed wheel and of a pinion including pins, and an engaging wheel engaging said toothed wheel, the pin pinion including two diametrically opposite pins separated by a distance configured to position said pins on either side of any tooth of said toothing, wherein said toothed wheel has a first non-circular profile and said engaging wheel has a second non-circular profile which is complementary to the first non-circular profile, and wherein the toothed wheel and the engaging wheel are arranged with respect to each other such that, when said two pins are oriented in a tangential direction to said toothing, said two wheels have a first gear ratio which is lower than a second gear ratio between said wheels when said two pins are in perpendicular alignment to said tangential direction.