| 摘要 |
Between two plates (1, 2) forming the support of a step-by-step motor driving a toothed wheel (5) are arranged a dissymmetrical stator (3) and a bipolar magnet rotor (4) mounted on a rotating shaft (41), with some axial play between two bearings (42, 43). These armatures (30, 31) making up the stator (3) are onset with respect to the transverse symmetrical plane of the rotor (4) so as to create a force F driving the rotor towards the plate (1). A driving crank of the wheel (5) by the step-by-step motor is composed of two plates (44, 45), concentric and perpendicular to the shaft (41), carrying between them two pins (46, 47) diametrically opposite and perpendicular to said plates. The base (460, 470) of the pins (46, 47) is cone-shaped.
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