Gear train structure of an electronic watch
US5617376A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Apr 12, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B35/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gear train structure of an electronic watch which is high in hand indication accuracy and which eliminates the occurrence of stopping of the watch due to dust, nap or the like. The electronic watch gear train structure includes a second wheel 13 having a minute hand attached thereto, and a braking wheel 15 for applying to the second wheel 13 a rotary torque of a reverse direction to a direction of rotation of the second wheel 13. The braking Wheel 15 includes a gear adapted to mesh with the second wheel 13, a spring 21 having one end thereof fastened to a shaft of the gear, and a balance spring frame 23 having a circumferential wall surface for contacting with the free end side of the spring 21. By vircute of this gear train structure, a rotary torque of a reverse direction to the direction of rotation of the second wheel is always applied to it from the braking wheel 15 and therefore the backlash between the two gears is always closed up in the reverse direction to the direction of rotation of the second wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.