Horology: time measuring systems or devices – Display trains
Patent
1988-01-11
1989-02-14
Roskoski, Bernard
Horology: time measuring systems or devices
Display trains
368324, 368322, 368323, G04B 1902
Patent
active
048051616
ABSTRACT:
In a drive gear structure for an electronically controller watch which includes a stepping motor having a drive pinion in engagement with an intermediate gear disc and a center gear in engagement with an intermediate gear pinion associated with the intermediate gear disc, a reducing gear structure is provided which has a reducing gear disc which is also in engagement with the same center gear disc and a reducing gear pinion which is in engagement with the minute gear of the watch. The single center gear disc is somewhat larger in width than the corresponding second gear disc of a corresponding watch with second hand indicator but not as wide as a second gear disc and second gear pinion used for a corresponding watch with second hand. The intermediate gear pinion and the reducing gear disc which are both in engagement with the second gear disc have the same pitch.
REFERENCES:
patent: 4090352 (1978-05-01), Jeannet et al.
patent: 4249251 (1981-02-01), Wuthrich
patent: 4351040 (1982-09-01), Aoki
patent: 4365889 (1982-12-01), Ushikoshi et al.
patent: 4378957 (1983-04-01), Malkin et al.
patent: 4488819 (1984-12-01), Schaffner
patent: 4496246 (1985-01-01), Ota et al.
Pforzheimer Uhrenwerke Porta GmbH
Roskoski Bernard
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