① Time travel system. The prime mover system uses a mainspring as the energy storage element, and the stored energy generally has two types: one day and eight days. Alarm clocks that store energy for 1 day often use a structure without a barrel; the gears in the drive train often use pin-shaped meshing with modified cycloids, and their pinions (cold wheels) use cylindrical steel wires as gear teeth; many escapement mechanisms Adopt a pin type (commonly known as a thick horse), which uses cylindrical steel wire as a fork pin, and the cost is low, but the travel time accuracy is also low; the vibration system uses a balance spring type. Due to the high speed of the balance wheel, the balance wheel has a vibration period of 0.6 seconds, and the balance shaft shaft and the balance bearing reciprocally rotate friction of 288,000 times in 24 hours. Therefore, the choice of the structure and material of the balance support directly affects the life of the clock . In order to improve the service life, the balance shaft and balance bearing of the alarm clock produced in China adopt a cylindrical matching structure. The top of the balance shaft is a spherical surface with a large radius of curvature. The pendulum bearing uses an inexpensive glass drill. This surface contact or line contact is doubled. The maintenance cycle and travel life of the clock. The hairspring is usually made of phosphor bronze or nickel-based alloy.
②Alarm system: usually includes four parts: the original motion mechanism, the transmission mechanism, the escapement mechanism and the anti-alarm mechanism. The time-of-day motion mechanism can also share a spring with the time-of-day motion mechanism, but a limited position mechanism is added to the mainspring shaft to control the length of the spring when it is released; the time-of-day escapement mechanism is isochronous to the vibration period The requirements are not high, so the escapement governor with no natural vibration period is often used instead of the balance wheel and the hairspring, and the hammer is installed on the fork shaft. The mechanical music alarm clock is also provided with a roller with a dial pin driven by a clockwork. The dial pins are arranged according to the musical notation, and the gong is tuned to play music.