| 摘要 |
PURPOSE:To facilitate hand correction and to forbid the generation of a deviated indication by changing the spring force in the spring part of a third wheel and pinion supporting lever at the time of hand correction and at the time of ordinary wearing. CONSTITUTION:The pressurized contact of an actuating part 10c of the third wheel and pinion supporting lever 10 is controlled at two points; the outside circumferential side face of the front end part 8d of a winding stem 8 and the base 8e of an arbor supporting part 8c at the time of wearing. The force that a third wheel arbor supporting part 10b moves in the direction parting from a central wheel 3 around a revolving central part 10c is, therefore, extremely large, since the spring part 10d is in the complete buckling direction. Disengagement of the intermeshed wheels is thus obviated and the deviated indication of the hands is prevented. The actuating part 10c of the lever is brought into pressurized contact by only the outside circumferential side face at the front end 8d of the winding stem and the force acts on the supporting part 10b in the direction parting from the wheel 3 with the central part 10a as the axis of rotation then the spring force of the part 10d is weakened. The failure of the respective wheels is, therefore, prevented at the time of the hand correction. Since the wheel 3 and a pinion part 4c are always held in contact with each other by a weak spring force, the hand deviation by the abrupt intermeshing of the wheel 3 and the third wheel and pinion 4 after the hand correction is obviated.
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