If you own a fully automatic mechanical watch then this article is worth reading. First, watch The calendar adjustment function is not complicated, but it is relatively complicated for beginners. Good adjustment can ensure the watch calendar function works properly. Today, I will introduce fully automatic mechanical watch calibration knowledge.

The calendar function may be considered one of the simplest additional functions of a fully automatic mechanical watch There are many types, the most common being the window calendar. Window calendars have many evolved forms, such as three types based on the speed of changing calendar numbers: (1) instant jump, (2) quick jump, (3) slow crawl. The calendar window is mostly located at the 3 o'clock position on the dial, but there are also other positions. However, a rather unique one is the so-called "big eye" calendar, which displays the tens and units digits of the calendar as two separate dials. This allows for larger numerals, eliminating the need for a magnifying glass on the watch glass. Fully automatic mechanical watches are not structurally complex. The main components of the calendar mechanism include: calendar dial, calendar date wheel, calendar gear, calendar positioning lever, calendar positioning lever spring, calendar quick-set wheel, calendar cover plate and screws, etc.

Working principle: Power is transmitted from the hour wheel, and through the speed change of the calendar gear, the calendar date wheel rotates once every 24 hours. The calendar date wheel has a pawl (or spring-like thing) used to actuate the teeth of the calendar dial. The calendar dial has 31 teeth and characters. The calendar positioning lever engages the teeth of the calendar dial and plays a positioning role under the pressure of the calendar positioning lever spring. If the date-changing format is slow crawl or quick jump, when changing the date, the calendar date wheel and the calendar dial will slowly move a little bit (from 8 pm to 12 pm); if the date-changing format is instant jump, then there is also a cam below the calendar date wheel, a large lever and a spring. When the cam is compressed and suddenly released by the large lever, the calendar dial is instantly moved over one tooth (character).

Most watches also allow for quick date setting, which is used to quickly adjust the calendar number. Generally, when the crown is pulled out one notch, the quick date setting can be activated. At this time, the date wheel meshing with the gear will disengage and mesh with the quick-set date wheel. The quick-set date wheel is an oscillating gear, that is, its shaft hole is a long hole. Therefore, only when the crown rotates in a certain direction, under the action of the tangential force at the gear meshing point, will it approach and engage the teeth of the calendar dial and rotate it. The quick-set date wheel often has few teeth, only 3-5. Please do not adjust the calendar during the period from 8 pm to 12 pm when the date changes.
     Summary The deeper your understanding of your beloved watch, the better you can maintain it, and the more convenient it will be to use. Fully automatic mechanical watches have a complex structure and are prone to misuse. The calendar function is an essential additional function, so taking care of the small details of the watch is a fundamental aspect of protecting it.