| 摘要 |
PURPOSE:To reduce the thickness while securing strength by composing the structure of fourth - center wheels, a minute wheel, etc., which receive driving power successively from a stepping motor and positioning the second and center wheel gears that the second and center wheels have almost at the same height in the thickness direction of the wrist watch. CONSTITUTION:The rotor 14 of the stepping motor makes one turn at intervals of one second to rotate the fourth wheel 16 to which a second hand is fitted at a reduced speed through the fifth wheel 15. Further, the center wheel 18 which is not coaxial with the fourth wheel 16 is decelerated and rotated from the fourth wheel 16 through the third wheel 17 and the center wheel 18 decelerates and rotates a minute wheel 19. Further, the gear part 18a of the center wheel 18 is set almost at the same height with the fourth wheel 16a and assembled while slipped on a pinion part 18b. Then, the fifth gear 15a and the third gear 17a are positioned almost at the same height. Consequently, 1.5mm. move thickness is realized. |
