In the mechanical watch, the energy of the energy released by restoring the deformation is used to restore the deformation of the deformation, or the mechanical vibration system is used as the time benchmark to realize the mechanical mechanism of the measurement time and time. There are many types of mechanical clock institutions, but they are generally composed of the original movement system, transmission system, escapement speed regulation system, upper acupuncture system and pointer system. The working principle is basically the same. In addition, the calendar watch also includes calendar (or dual calendar) institutions, and automatic watches also include automatic upper -bar institutions.

The original movement of the original movement and transmission of working energy. It is divided into two types: heavy hammer original movement system and spring original movement system.

The original motion of the hammer uses the gravity of the heavy hammer for energy. Mostly used for simple hanging clocks and landing clocks. The structure of the heavy hammer is simple and the torque is stable, but when the heavy hammer is up, the transmission system and the original movement system are off, and the watch mechanism stops working.

The original movement of the spring is used to recover the energy from the deformation of the deformation with the reeds rolled into a snail -shaped zone. One end is connected to the axis, and the other end is connected to the shell of an unmoved part or a clockwork box. The spring original movement is used as the energy of the portable clock, and it is also used to swing on the clock. The spring original movement has three types: with a fixed bar type, without bar box, and a active bar.

The transmission system transmits the energy of the original movement to a set of transmission gears of the escapement speed system. It is usually composed of a series of wheels and tooth shafts (Figure 3). In the main drive, the mid -wheel is an active gear and the tooth shaft is a moving gear. Calculate the transmission ratio according to the following formulas: I = Z1/Z2 in the formula of Z1 as the active gear tooth number, and the Z2 is the number of tooth tooth from the gear tooth. For clocks with seconds needle device, the transmission ratio of the tooth shaft of the wheel to the second wheel must be equal to 60. Most of the tooth shapes of the watch transmission system are specially designed.

The transmission system can be divided into two categories in the plane configuration of the "two -wheel" (time wheel and division wheel): ① the center of the center, the two -wheeled in the center of the movement movement. It also includes direct transmission, second spring type, short seconds and non -second needle, two -wheel, and double three -wheel. ② Two rounds, the second round is not in the center of the movement movement. It also includes the header of the header, the two -wheel transmission style, and the three -wheel transmission.