The principle of automatic flushing toilet?

Each automatic flushing toilet has a float inside, as the water level in the toilet rises, the float produces more and more buoyancy, when the water level rises to a predetermined value, the buoyancy produced by the float will be transmitted through a see-saw structure to release the water plug, the plug will be automatically pulled out. After the water is discharged, the plug is automatically returned under the action of the spring and enters the next round of water filling cycle.