Invention Grant
- Patent Title: Timepiece movement and timepiece
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Application No.: US17039316Application Date: 2020-09-30
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Publication No.: US11619911B2Publication Date: 2023-04-04
- Inventor: Masayuki Kawata , Katsuya Mugishima , Ken Sato , Yuya Tanaka
- Applicant: SEIKO WATCH KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: SEIKO WATCH KABUSHIKI KAISHA
- Current Assignee: SEIKO WATCH KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: JPJP2019-190283 20191017,JPJP2020-138000 20200818
- Main IPC: G04C3/14
- IPC: G04C3/14 ; G04B19/02

Abstract:
A timepiece includes a first motor having a rotor for rotating a hour hand, and a first train wheel group having a wheel gear rotating based on rotation of the rotor. The first train wheel group includes a third intermediate hour pinion, a first intermediate hour pinion, a twenty four hour wheel gear having a first reference load unit disposed to mesh with the third intermediate hour pinion so that a load received by the rotor fluctuates in a case where the twenty four hour wheel gear meshes with the third intermediate hour pinion, and rotating at a first reduction ratio with respect to the rotor, and a second intermediate hour wheel gear having a second reference load unit disposed to mesh with the first intermediate hour pinion so that the load received by the rotor fluctuates in a case where the second intermediate hour wheel gear meshes with the first intermediate hour pinion, and rotating at a second reduction ratio lower than the first reduction ratio with respect to the rotor.
Public/Granted literature
- US20210116867A1 TIMEPIECE MOVEMENT AND TIMEPIECE Public/Granted day:2021-04-22
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