I have an alarm clock that needs winding. What is it based on?

The energy of the clockwork will gradually weaken with the movement. According to the principle of lever torque, when the spring is full, its torque is the largest (the torque lever is the longest), so the front end of the spring needs to output less force. After running for a period of time, the spring tightly wound on the spring shaft will slowly loosen and the energy will be reduced. When the energy is about to run out, the torque at the end of the spring is the smallest (the torque lever is the shortest) and the output power is also small, so it is necessary to increase the transmission power to maintain the movement operation.