Watch having a first barrel complete with a diameter that is less than a diameter of a second barrel complete

Patent metadata

Field	Value
Publication number	US-11835924-B2
Application number	US-202117158106-A
Country	US
Kind code	B2
Filing date	Jan 26, 2021
Priority date	Jan 27, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A watch includes a first barrel complete including a first barrel arbor, a first mainspring, and a first barrel, and a second barrel complete that includes a second barrel arbor, a second mainspring, and a second barrel, is disposed side by side in a planar direction orthogonal to a shaft direction of the first barrel arbor, and receives transmission of rotation of the first barrel complete. A tooth tip circle diameter of the first barrel complete is smaller than a tooth tip circle diameter of the second barrel complete, and a thickness of the first barrel is greater than a thickness of the second barrel.

First claim

What is claimed is:

1. A watch comprising:
a first barrel complete including a first barrel arbor, a first mainspring, and a first barrel; and
a second barrel complete that includes a second barrel arbor, a second mainspring, and a second barrel, and is disposed side by side in a planar direction orthogonal to a shaft direction of the first barrel arbor so that rotation of the first barrel complete is transmitted to the second barrel,
wherein a tooth tip circle diameter of the second barrel complete is 1.5 to 2.0 times greater than a tooth tip circle diameter of the first barrel complete, and
a thickness of the first barrel is greater than a thickness of the second barrel.

2. The watch according to claim 1 , wherein windup torque of the first barrel complete is greater than windup torque of the second barrel complete.

3. The watch according to claim 1 , wherein the first mainspring is fixed with one end of the first mainspring engaging with a notch formed in an inner circumferential surface of the first barrel, and
the second mainspring is fixed to an inner circumferential surface of the second barrel by a slipping attachment.

4. The watch according to claim 1 comprising:
an automatic windup mechanism for winding up the first mainspring, wherein
a first ratchet wheel is fixed to the first barrel arbor, and
the automatic windup mechanism includes a windup wheel configured to mesh with the first ratchet wheel, and a shaft of the windup wheel does not overlap the first barrel in plan view as viewed from a shaft direction of the first barrel arbor.

5. The watch according to claim 1 , wherein
a first ratchet wheel is fixed to the first barrel arbor, and
a tooth tip circle diameter of the first ratchet wheel is greater than a tooth tip circle diameter of the first barrel complete.

6. The watch according to claim 1 comprising:
a dial including a plurality of graduations provided thereon, wherein,
when the watch is divided into two regions by a line segment connecting the graduations indicating three o'clock and nine o'clock of the dial in plan view as viewed from a direction orthogonal to the dial, the first barrel complete and the second barrel complete are disposed in one of the regions, and a speed governing mechanism for governing a speed of a train wheel driven by the first barrel complete and the second barrel complete is disposed in the other region.

Assignees

• Seiko Epson Corp

Inventors

• Hayashi Shigeyuki

Classifications

• G04B1/16 Primary

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

• G04B1/12 Primary

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

• G04B7/00

  Combined normal and automatic winding up {(normal winding up by hand or mechanically G04B3/00; automatic winding up G04B5/00; electric winding up of mechanical clockworks G04C1/003)} · CPC title

• G04C3/14

  incorporating a stepping motor (G04C3/02 - G04C3/12 take precedence {; generating commutating pulses in primary clocks G04C13/0463}) · CPC title