Watch, or wristwatch, refers to the instrument worn on the wrist to time / display time. Watch in English comes from the medieval word watch.
The watch is usually made of leather, rubber, nylon cloth, stainless steel and other materials to make a watch band, and the “meter head” that shows the time is tied on the wrist.
The manufacture and production of watches are based on a simple and witty invention, which is called “spring”. It can tighten and store energy, and release energy slowly to push the running device and pointer in watches to achieve the function of displaying time. This spring device in watches is called the main spring
How watches work
How watches work
（Mainspring）。 Watch structure watch is composed of meter head and strap (buckle). The parts and components of the head include: movement, case, bottom cover, mirror surface, literal (often called dial), pointer, handle (for adjusting time, also called pressing), command (for some types of meters).
The working principle of the watch is a kind of precise instrument used to indicate time. The principle of the instrument is to use a vibration system with constant cycle and continuous vibration as the standard. If we know the time (vibration period) needed by the vibration system to complete a watch’s full vibration and calculate the number of vibrations, then the time after so many vibrations is equal to the vibration period times the number of vibrations. That is, time = vibration period × vibration times
The mechanical watch adopts the cycloid as the vibration system. The cycloid 1 is fixed on the cycloid 2, and the upper and lower journal of the cycloid are sleeved in the bearing, which can rotate around the bearing. One end of the hairspring 3 is fixed on the pendulum shaft and the other end is fixed on the splint. Because of the elastic deformation of the spring, the movement of the cycloid changes from rotation to reciprocating. The swing amplitude (amplitude) of the swing system will gradually decrease, and finally it will stop. In order to make it continuously vibrate without attenuation, it is necessary to regularly supplement energy to the cycloid system, that is to say, there must be an energy device in the watch. The periodic supplement of energy to the vibration system is realized by a special mechanism – escapement mechanism. The escapement mechanism is also used to calculate the vibration times of the cycloid system. Therefore, the cycloid and escapement system is the key device of the mechanical watch.