Timepiece

Patent metadata

Field	Value
Publication number	US-11550261-B2
Application number	US-202016787116-A
Country	US
Kind code	B2
Filing date	Feb 11, 2020
Priority date	Feb 12, 2019
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A timepiece having multiple springs while reducing the plane size of the movement. The timepiece has a first barrel including a first barrel arbor, a first spring, and a first barrel wheel; and a second barrel including a second barrel arbor, a second spring, and a second barrel wheel, disposed to a position not superimposed with the first barrel in a plan view from the axial direction of the first barrel arbor and the second barrel arbor, and having rotation of the first barrel transferred thereto; a planetary gear mechanism having a display pivot that turns in a first direction when rotation of the first ratchet wheel that turns in unison with the first barrel arbor is transferred, and turns in a second direction opposite the first direction when rotation of the second barrel wheel is transferred, and is disposed to a position not superimposed with the first barrel and the second barrel in plan view; and a power reserve wheel train including multiple wheels that transfer rotation of the first ratchet wheel to the planetary gear mechanism, and having one of the multiple wheels axially supported by the second barrel arbor.

First claim

What is claimed is:

1. A timepiece comprising:
a first barrel including a first barrel arbor, a first spring, and a first barrel wheel;
a second barrel including a second barrel arbor, a second spring, and a second barrel wheel, disposed to a position not superimposed with the first barrel in a plan view from the axial direction of the first barrel arbor and the second barrel arbor, and having rotation of the first barrel transferred thereto;
a first ratchet wheel that turns in unison with the first barrel arbor;
a planetary gear mechanism having a display pivot that turns in a first direction when rotation of the first ratchet wheel is transferred, and turns in a second direction opposite the first direction when rotation of the second barrel wheel is transferred, and is disposed to a position not superimposed with the first barrel and the second barrel in plan view; and
a power reserve wheel train including multiple wheels that transfer rotation of the first ratchet wheel to the planetary gear mechanism, and having one of the multiple wheels axially supported by the second barrel arbor.

2. The timepiece described in claim 1 , wherein:
the planetary gear mechanism includes a first sun wheel including the display pivot, and a first sun gear that rotates in unison with the display pivot,
a second sun wheel of which the pivot is the display pivot, and which has a second sun gear to which rotation of the first ratchet wheel is transferred, and a second sun pinion that rotates in unison with the second sun gear,
an intermediate planetary gear of which the pivot is the display pivot and to which rotation of the second barrel wheel is transferred,
a planetary gear that is supported pivotably to the intermediate planetary gear on a pivot disposed eccentrically to the pivot of the intermediate planetary gear, and meshes with the second sun pinion, and a planetary pinion that meshes with the first sun gear; and

the power reserve wheel train including a winding indicator wheel train having multiple wheels that transfer rotation of the first ratchet wheel to the second sun gear, one of the multiple wheels supported by the second barrel arbor, and
an unwinding indicator wheel train including multiple wheels that transfer rotation of the second barrel wheel to the intermediate planetary wheel.

3. The timepiece described in claim 1 , wherein:
the second barrel arbor is also used as a pivot of a part other than the one of the multiple wheels.

4. The timepiece described in claim 1 , wherein:
the second barrel is disposed between the first barrel and the planetary gear mechanism.

5. The timepiece described in claim 1 , wherein:
the power reserve wheel train includes multiple wheels disposed superimposed in plan view with the first barrel or the second barrel, and not superimposed with each other in plan view.

6. The timepiece described in claim 1 , further comprising:
a main plate that axially supports the first barrel arbor and the second barrel arbor; and
a winding stem disposed freely rotatably to the main plate;
the first barrel and the second barrel being disposed in one of two areas of the main plate divided in plan view along the axial direction of the winding stem.

7. The timepiece described in claim 6 , further comprising:
a wheel train that is driven by the second barrel wheel; and
a generator that is driven by the wheel train produces induced electromotive force, and outputs electrical energy;
the generator being disposed in the other of the two areas of the main plate divided in plan view along the axial direction of the winding stem.

Assignees

• Seiko Epson Corp

Inventors

• Hiraya Eiichi

Classifications

• G04B29/02

  Plates; Bridges; Cocks · CPC title

• G04B9/005 Primary

  by optical indication of the amount of winding · CPC title

• G04B1/16

  Barrels; Arbors; Barrel axles (arrangements facilitating the removal of the mainspring G04B33/14) · CPC title

• G04B13/02 Primary

  Wheels; Pinions; Spindles; Pivots (bearings G04B31/00 {; chain wheels, spindles for chain wheels, also chains and driving weights G04B1/08}) · CPC title

• G04B1/12

  with several mainsprings {(installations with a mainspring and an auxiliary spring G04B1/225; winding-up several mainsprings simultaneously G04B3/008)} · CPC title