① Play: It consists of a hammer, swing rod, hanging device, and cyclical adjustment device. Used in a fixed clock. After the hammer is dereated from the lead vertical line (balanced position) at any angle under the action of external forces, under the action of gravity, the hammer will be moved around the campaign. The vibration process is a process of switching energy and bit energy.

② Twisted swing: It is mainly composed of panels and hanging wires. The lower end of the hanging wire is fixed, and the upper end is fixed on an unmoved fulcrum. The section of the hanging wire can be rectangular or round. Twisting and retreating agency or fork tile escaped agency constitutes the escapement speed system. The reversal has a long vibration cycle (a few seconds to tens of seconds), which is mostly used for a fixed clock with a long time for energy than saving.

③ Vibration system of swimming wire: The inside and inside of the scarf are fixed on the shaft and the splint, respectively. When the strain is deviated from its balanced position and starts to swing, the scarf is twisted and generated, which is usually called the recovery torque. This torque prompts the swing wheel to balance the position of the position.

The upper -point needle system rolls tightly in the original movement system and moves the timing of the time, and the needle is to correct the time of the clock. When the upper strip, the vertical and clutch wheels are in a meshing state. When dialing the needle, the clutch and the vertical wheel are taken off and meshing with the needle wheel.