| 摘要 |
In order to position a clutch plate 20 in a first angular position, in which teeth 2 a of a second gear 2 mesh with a pinion 3 b of a third gear 3 , an abutment 21 and a projection 12 are provided on the clutch plate 20 and a main plate 10 , respectively. An abutment surface 21 A that is substantially perpendicular to a straight line alpha connecting between centers of rotation of the gears 2, 3 is provided on abutment 21 . The abutment surface 21 A restricts displacement in a direction, in which a distance between the centers of rotation of the gears 2, 3 is decreased, to prevent deformation of the clutch plate 20 , which leads to deep meshing of the gears 2, 3 , and rotating drive resistance of the gears 2, 3 is maintained small to prevent an increase in loss of mechanical energy and prevents unwanted stoppage of the timepiece 1.
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