Timepiece movement, mechanical timepiece, and method for releasing pawl lever from engagement

Patent metadata

Field	Value
Publication number	US-10248082-B2
Application number	US-201715837204-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 13, 2016
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A timepiece movement includes: a barrel wheel; a ratchet wheel; a rotary weight; a transmission wheel that causes the ratchet wheel to rotate; a pawl lever that engages with the transmission wheel, is interlocked with the rotary weight, and performs forward/backward movement in directions of approaching and moving away from the transmission wheel; a base panel; and a wheel train bearing provided between the base panel and the rotary weight. The pawl lever and the transmission wheel are positioned between the base panel and the wheel train bearing. The transmission wheel is pivotally supported by the wheel train bearing. The wheel train bearing is provided with a release portion for releasing the pawl lever and the transmission wheel from engagement therebetween by moving the pawl lever.

First claim

What is claimed is:

1. A timepiece movement comprising:
a barrel wheel;
a ratchet wheel;
a rotary weight;
a transmission wheel that causes the ratchet wheel to rotate;
a pawl lever, which engages with the transmission wheel, is interlocked with the rotary weight, and performs forward/backward movement in directions of approaching and moving away from the transmission wheel;
a base panel; and
a wheel train bearing provided between the base panel and the rotary weight,
wherein the pawl lever and the transmission wheel are positioned between the base panel and the wheel train bearing,
wherein the transmission wheel is pivotally supported by the wheel train bearing, and
wherein the wheel train bearing is provided with a release portion for releasing the pawl lever and the transmission wheel from engagement therebetween by moving the pawl lever.

2. The timepiece movement according to claim 1 ,
wherein the release portion is a through-hole which penetrates through the wheel train bearing and into which an operation member that moves the pawl lever is inserted.

3. The timepiece movement according to claim 1 ,
wherein the pawl lever has a pulling pawl lever portion and a pushing pawl lever portion which pinch the transmission wheel therebetween in plan view,
wherein the pulling pawl lever portion has a pulling pawl that engages with the transmission wheel,
wherein the pushing pawl lever portion has a pushing pawl that engages with the transmission wheel,
wherein the release portion is a first through-hole and a second through-hole that penetrate through the wheel train bearing, and
wherein, in a case where the pawl lever is positioned at a predetermined position in a movable range of the forward/backward movement,
a part of an opening of the first through-hole on the base panel side overlap the pulling pawl lever portion and the rest of the opening is positioned on the pushing pawl lever portion side from the pulling pawl lever portion in plan view, and
a part of an opening of the second through-hole on the base panel side overlap the pushing pawl lever portion and the rest of the opening is positioned on the pulling pawl lever portion side from the pushing pawl lever portion in plan view.

4. The timepiece movement according to claim 3 ,
wherein the predetermined position is a position at which the pawl lever is closest to the transmission wheel.

5. The timepiece movement according to claim 3 ,
wherein an opening of the first through-hole on the rotary weight side is larger than the opening of the first through-hole on the base panel side, and
wherein an opening of the second through-hole on the rotary weight side is larger than the opening of the second through-hole on the base panel side.

6. The timepiece movement according to claim 2 ,
wherein the rotary weight is provided in the wheel train bearing.

7. The timepiece movement according to claim 1 , further comprising:
a winding stem; and
a manual winding wheel train that is interlocked with rotation of the winding stem and causes the ratchet wheel to rotate.

8. A mechanical timepiece comprising:
the timepiece movement according to claim 1 ; and
a case in which the timepiece movement is accommodated.

9. A mechanical timepiece comprising:
the timepiece movement according to claim 2 ; and
a case in which the timepiece movement is accommodated.

10. A mechanical timepiece comprising:
the timepiece movement according to claim 3 ; and
a case in which the timepiece movement is accommodated.

11. A mechanical timepiece comprising:
the timepiece movement according to claim 4 ; and
a case in which the timepiece movement is accommodated.

12. A mechanical timepiece comprising:
the timepiece movement according to claim 5 ; and
a case in which the timepiece movement is accommodated.

13. A mechanical timepiece comprising:
the timepiece movement according to claim 6 ; and
a case in which the timepiece movement is accommodated.

14. A mechanical timepiece comprising:
the timepiece movement according to claim 7 ; and
a case in which the timepiece movement is accommodated.

15. A method for releasing a pawl lever from engagement in a timepiece movement which includes: a barrel wheel; a ratchet wheel; a rotary weight; a transmission wheel that causes the ratchet wheel to rotate; a pawl lever that engages with the transmission wheel, is interlocked with the rotary weight, and performs forward/backward movement in directions of approaching and moving away from the transmission wheel; a base panel; and a wheel train bearing provided between the base panel and the rotary weight, in which the pawl lever and the transmission wheel are positioned between the base panel and the wheel train bearing, the transmission wheel is pivotally supported by the wheel train bearing, and the wheel train bearing is provided with a through-hole, the method comprising:
inserting an operation member into the through-hole from the rotary weight side, pushing and moving the pawl lever by the operation member, and releasing the pawl lever and the transmission wheel from engagement therebetween.

Assignees

• Seiko Epson Corp

Inventors

• Hiraya Eiichi

Classifications

• G04B5/00

  Automatic winding up {(normal winding up by hand or mechanically G04B3/00; automatic winding in combination with hand winding G04B7/00; electrical winding of mechanical clockworks G04C1/00; advertising by making use of vibrations or shocks of land vehicles G09F21/045)} · CPC title

• G04B11/04 Primary

  Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet · CPC title

• G04B5/12

  acting in one direction only · CPC title

• G04B11/00

  Click devices; Stop clicks; Clutches {(mechanisms for winding up by hand G04B3/00; automatic winding up G04B5/00; clutches in general, class 111)} · CPC title

• G04B5/02 Primary

  by self-winding caused by the movement of the watch {(bearings, suspensions for oscillating weights G04B5/18; mechanisms for transformation of an oscillating movement into a rotating movement in only one direction G04B11/00)} · CPC title