MECHANISM FOR REDUCING VARIABILITY IN STOPPING POSITION OF HAND

Title:

MECHANISM FOR REDUCING VARIABILITY IN STOPPING POSITION OF HAND

Document Type and Number:

WIPO Patent Application WO/2019/123821

Kind Code:

A1

Abstract:

In a mechanism for reducing variability in a stopping position of a hand, in order to prevent damage even if a torque acts in the opposite direction to a hand moving direction a mechanism (10) for reducing variability in a stopping position of a second hand (96) is provided with: a return gear (11) which is driven in conjunction with a wheel train mechanism (80), which is a timepiece display mechanism; a slip torque spring (12) (friction member) which is in contact with the return gear (11) to apply a frictional force to the drive of the return gear (11); and a return spring (13) (return spring member) which applies to the slip torque spring (12) a torque in the direction (the direction of the dashed arrow -R) opposite to the normal hand moving direction (the direction of the arrow R) of the return gear (11).

Inventors:

IMAMURA KAZUYA (JP)
MORITA SHOICHIRO (JP)

Application Number:

PCT/JP2018/039410

Publication Date:

June 27, 2019

Filing Date:

October 24, 2018

Export Citation:

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Assignee:

CITIZEN WATCH CO LTD (JP)

International Classes:

G04B35/00; G04B13/02; G04B19/02

Foreign References:

JP2646946B2	1997-08-27
JP2005003521A	2005-01-06
JP2008014782A	2008-01-24
JP2017138286A	2017-08-10
JP2012021987A	2012-02-02
JP2646946B2	1997-08-27
JP2017244166A	2017-12-20

Other References: