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1. (WO2017033688) WATCH ESCAPEMENT

Pub. No.:    WO/2017/033688    International Application No.:    PCT/JP2016/072686
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Wed Aug 03 01:59:59 CEST 2016
IPC: G04B 15/14
Applicants: CITIZEN WATCH CO., LTD.
シチズン時計株式会社
Inventors: FUKUDA Tadahiro
福田 匡広
FUKAYA Shinpei
深谷 新平
Title: WATCH ESCAPEMENT
Abstract:
With regard to a watch escapement, in order to improve the efficiency of energy transmission from an escape wheel to a pallet fork, provided is a watch escapement 1 comprising: an escape wheel 10 that rotates about a center axis C1 and that has 15 teeth; an oscillating pallet fork 50 that switches the escape wheel 10 between a rotating state and a stopped state, and that has an exit-pallet 56 and an entry-pallet 55 which receive torque from the escape wheel 10 as a result of coming into contact with the teeth 11. The escape wheel 10 and a balance wheel (impulse jewel 60) transfer and receive torque via only the pallet fork 50. The pallet fork 50 is provided, separate from the entry-pallet 55 and the exit-pallet 56, with a third pallet 58 (torque transferring and receiving member) that receives torque from protruding members 13 of the escape wheel 10.