Calendar mechanisms, movements and timepieces

Abstract

The present invention provides a calendar mechanism, a movement, and a timepiece that can be configured simply, can suppress a load on a wheel train, and can automatically advance the date at the end of February regardless of an ordinary year or a leap year. The calendar mechanism (10) is equipped with: a small moon and a day-changing wheel (25), which rotates 1 circle a day around the first axis (C1); a date wheel (50), which has a claw (53) at the end of the month, and a month Rotate 1 circle; and the small month date feed claw (35), which is arranged on the small month date change wheel (25), and rotates synchronously with the small month date change wheel (25) while shifting, the small month date feed claw ( 35) Press the end claw (53) on the last day of a month other than February in a small month with less than 30 days in a month to make the date wheel (50) rotate the first angle, in February of a leap year Press the end-of-month claw (53) on the last day of February to rotate the date wheel (50) by a second angle larger than the first angle, and press the end-of-month claw (53) on the last day of February in an ordinary year to rotate the date wheel (50) A third angle larger than the second angle.

Description

technical field [0001] The invention relates to a calendar mechanism, a movement and a timepiece. Background technique [0002] In a timepiece with a calendar capable of displaying the month and day, a calendar mechanism is known in which the date is advanced by two days at the end of a small month in which the number of days in a month is 30 days or less, thereby suppressing the date correction to a minimum. limit. [0003] For example, Patent Document 1 below describes a calendar mechanism including a planetary gear mechanism having: a lunar satellite portion having five driving teeth; and a fixed planetary gear set concentric with the date rotating portion. , and has a direct driving relationship with the Moon and Satellite Department. [0004] In addition, the following non-patent literature 1 describes a calendar mechanism having the following parts: a control cam; a month display lock arm, which is operated by the control cam; a month display lock arm finger; a date ...

AI Technical Summary

Problems solved by technology

[0009] However, in the prior art described in the aforementioned Patent Document 1, since a planetary gear mechanism using a plurality of gears is provided, the structure is complicated.

In addition, in the prior art described in the above-mentioned Patent Document 1 and Non-Patent Document 1, since the date is fed for two days at the end of a small month, it is necessary to manually add the date at the end of February every year. feed

In addition, in the prior art described in the above-mentioned non-patent document 2, since the main rod is swung every day, there is a possibility that the load applied to the wheel train that drives the 24-hour claws is greater than that required by the swing of the main rod. The amount increased

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