Title:
SPEED GOVERNOR FOR WATCH AND ADJUSTMENT METHOD OF PIECE WEIGHT OF BALANCE WHEEL USED THEREFOR
Document Type and Number:
Japanese Patent JP2019007965
Kind Code:
A
Abstract:
To provide a speed governor for watch capable of preventing breakage of a hairspring due to an impact applied without increasing the size of a watch even when a silicon hairspring is used.SOLUTION: A speed governor for watch 1 has a balance wheel 4 and a hair spring 6 which are fitted and engaged with a rotating shaft 5 which is pivotally supported by abutting against the mortise hole 7a formed in a balance bearing 7. The balance wheel 4 has a resin structured item 3a, and the resin structured item 3a has a removal part for balancing piece weight of the balance wheel 4.SELECTED DRAWING: Figure 1
Inventors:
TERAJIMA KAZUHIKO
ABE YOSUKE
ABE YOSUKE
Application Number:
JP2018139262A
Publication Date:
January 17, 2019
Filing Date:
July 25, 2018
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
International Classes:
G04B17/06; G04B17/26; G04D7/08
Attorney, Agent or Firm:
Akira Miyajima