Horology: time measuring systems or devices – Chronological – With power monitor
Patent
1999-11-29
2000-12-26
Miska, Vit
Horology: time measuring systems or devices
Chronological
With power monitor
140203, G04B 900, G04B 110, G04B 100
Patent
active
061669997
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a timepiece with spring winding state display having a function of displaying a winding state of a spring which constitutes a power source of a mechanical type timepiece, particularly to a timepiece with spring winding state display mounted with a display device which is small-sized and easy to see by using a planetary gear mechanism.
BACKGROUND ART
In a mechanical type timepiece, there has been developed a mechanism to display of remaining time for which a spring can be operated, that is, to display a duration time period of the timepiece (power reserve mechanism). According to such a power reserve mechanism, there is used a planetary gear mechanism for reciprocating in a fan-like shape a hand for displaying the duration time period of the timepiece.
For example, there is disclosed a constitution of a timepiece with spring winding state display in JP-A-9-21886.
As shown in FIG. 14, such a conventional timepiece with spring winding state display is constituted by a ratchet wheel 1, a planetary reduction wheel gear 7 in mesh with a barrel complete 2, a planetary gear mechanism constituted by a planetary wheel 8 rotatably attached to an eccentric portion of the planetary reduction wheel gear 7, a sun wheel 6 in mesh with a planetary pinion 8b and a second sun wheel 4 in mesh with a planetary gear 8a, a display transmission wheel 17 in mesh with a sun wheel pinion 6c, a display wheel 18 in mesh with a display transmission pinion 17b, a display degree determining pin 9b and a planetary transmission wheel 19 in mesh with the ratchet wheel 1 and a second sun gear 4a.
However, according to the conventional timepiece with spring winding state display, there pose the following problems.
(1) Gears constituting the planetary gear need a large space in view of the characteristic and the speed reduction ratio cannot be increased. For example, the speed reduction ratio is generally about 1/2. Accordingly, a plurality of speed reduction gear trains use other than the planetary gear are required.
(2) Therefore, in order to mount a power reserve mechanism to a timepiece, a large space has to be secured in a movement of the timepiece.
(3) Since an angle of reciprocating a hand for displaying of duration time of the timepiece in a fan-like shape, is determined by the speed reduction ratio of the planetary gear and the speed reduction gear trains related thereto and accordingly, the angle of reciprocating the hand in a fan-like shape is difficult to change.
Hence, in order to resolve the above-described problems, objects of the invention reside in points described below.
(1) To reduce a number of parts constituting a timepiece with spring winding state display.
(2) To downsize a movement of a timepiece with spring winding state display.
(3) To realize a timepiece with spring winding state display in which rotation range of a power reserve hand (a hand operating fan angle) can be easily changed.
DISCLOSURE OF INVENTION
In order to resolve the above-described problems, the invention is constituted such that in a timepiece with spring winding state display having a function of displaying a winding state of a spring which constitutes a power source of a mechanical type timepiece comprises a barrel complete having a mainspring, a barrel arbor, a barrel gear and a barrel cover, the barrel gear being constituted to be rotatable only in one direction by rewinding of the mainspring by the barrel gear, a ratchet wheel supported to rotate integrally with the barrel arbor and rotatable only in the same direction as the direction of rotation of the barrel gear, a ratchet wheel rotation regulating member for regulating rotation of the ratchet wheel only in one direction and an intermediate ratchet wheel installed rotatably by the rotation of the ratchet wheel.
Further, the timepiece with spring winding state display according to the invention is constituted to include a planetary reduction wheel gear installed rotatably by rotation of the barrel gear, a planetary wheel installed rotat
REFERENCES:
patent: 588373 (1897-08-01), Antoine
patent: 1191525 (1916-07-01), Mazer
patent: 4500213 (1985-02-01), Grimm
patent: 5699322 (1997-12-01), Born
patent: 5828628 (1998-10-01), Born et al.
Jujo Koichiro
Shibiya Norio
Takizawa Katsuyoshi
Miska Vit
Seiko Instruments Inc.
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