EP 0029204 B1 19830629 - MECHANISM FOR POSITIONING A CENTRE WHEEL
Title (en)
MECHANISM FOR POSITIONING A CENTRE WHEEL
Publication
Application
Priority
FR 7928761 A 19791116
Abstract (en)
[origin: US4408898A] The invention provides a positioning mechanism for a center wheel in a timepiece enabling precision positioning for the seconds or minutes hand relative to the dial divisions. It comprises a jumper spring (1) friction mounted onto the base plate and cooperating with the teeth (3) of the center wheel (4) and a wheel member (29) interposed between the center wheel (4) and the motor pinion (14). The wheel member includes a pinion (17) meshing with the center wheel as well as a gear (16) friction mounted relative to said pinion and meshing with the motor pinion. The positioning method consists of immobilizing the motor pinion then turning the center wheel to bring the end of the jumper spring into coincidence with a tooth space thereof. The invention is employed to position exactly the seconds or minutes hand of an electronic timepiece having a stepping motor.
IPC 1-7
IPC 8 full level
G04C 3/14 (2006.01); G04B 13/00 (2006.01); G04B 19/02 (2006.01); G04B 35/00 (2006.01)
CPC (source: EP US)
G04B 13/002 (2013.01 - EP US); G04B 19/02 (2013.01 - EP US); G04B 35/00 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE GB LI
DOCDB simple family (publication)
EP 0029204 A1 19810527; EP 0029204 B1 19830629; DE 3063990 D1 19830804; FR 2469743 A1 19810522; FR 2469743 B1 19820917; JP S56124077 A 19810929; JP S6133473 B2 19860802; US 4408898 A 19831011
DOCDB simple family (application)
EP 80106960 A 19801112; DE 3063990 T 19801112; FR 7928761 A 19791116; JP 15969480 A 19801114; US 20622880 A 19801112