Timepiece

Abstract

A timepiece enables knowing the cumulative drive time indicating how long the timepiece was actually operating. The timepiece 10 has a movement 20, hands disposed to the time display wheel train of the movement 20 for indicating the time, and a month display ring 41 and year display ring 51 that are connected to the movement 20 and count how long the drive source has been driving inside a case. The movement 20 includes a movement barrel 30 housing a spring as the power source, a time display wheel train linked to rotation of the movement barrel 30, and a cumulative drive time display mechanism that operates in conjunction with rotation of and transfers torque from the movement barrel 30. The case includes at least a crystal, a casing 11, and a back cover 12. Part of the back cover 12 is transparent to enable viewing the month display ring 41 and year display ring 51.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view from the back of a timepiece according to a first embodiment of the invention.

FIG. 2 is a schematic plan view showing the arrangement of the cumulative drive time display mechanism in a first embodiment of the invention.

FIG. 3 is a plan view of a first wheel train in the first embodiment of the invention.

FIG. 4 is a section view of a first wheel train in the first embodiment of the invention.

FIG. 5 is a section view showing the arrangement of the cumulative drive time display mechanism in the first embodiment of the invention.

FIG. 6 describes the concept of cumulative drive time in the first embodiment of the invention.

FIG. 7 is a partial section view showing the cumulative drive time display mechanism in a second embodiment of the invention.

FIG. 8 is a plan view showing the relationship between the month hand and year hand and the month scale and year scale in the second embodiment of the invention.

FIG. 9 is a schematic plan view showing the arrangement of the cumulative drive time display mechanism in a third embodiment of the invention.

FIG. 10 is a section view showing the power reserve wheel train according to a third embodiment of the invention.

Claims

1. A timepiece comprising: a movement having a power source, a first wheel train for transferring torque in conjunction with rotation of the power source, and a second wheel train that transfers torque in conjunction with rotation of the power source independently of the first wheel train;a time display member disposed to the first wheel train; anda cumulative drive time display member disposed to the second wheel train for displaying a cumulative drive time denoting the cumulative time that the power source is driving.

2. The timepiece described in claim 1, wherein the display member for displaying the cumulative drive time is a display plate having a scale indicating the cumulative drive time.

3. The timepiece described in claim 1, wherein the display member for displaying the cumulative drive time is a hand, and a scale indicating the cumulative drive time is added at the edge of or below the rotational range of the hand.

4. The timepiece described in claim 1, wherein the display member for displaying the cumulative drive time is disposed on the opposite side of the movement as the time display member.

5. The timepiece described in claim 1, wherein the display member for displaying the cumulative drive time has a month display member and a year display member.

6. The timepiece described in claim 1, wherein the power source is a spring.

7. The timepiece described in claim 6, further comprising a power reserve wheel train for displaying the reserve power of the spring, wherein a wheel in the second wheel train is a part of the power reserve wheel train.

8. The timepiece described in claim 1, wherein the movement, the time display member, and the cumulative drive time display member are disposed inside a case including a crystal, a casing, and a back cover; and a part of the back cover is a transparent member enabling viewing the cumulative drive time display member.