Principle of fruit beat piano

Use mechanical, electrical or electronic equipment that can emit a steady beat at different speeds. The principle of the fruit beat piano is to use a mechanical, electric or electronic device, which can emit stable beats at various speeds. It has a clock structure, a gear and a spring to drive a swing rod, and the swing rod will make a sharp "drip" sound at the end of each swing. The speed of these dripping sounds can be adjusted by moving the pendulum up and down according to the scale of the cursor engraved on the pendulum rod, and its speed is 40 ~ 2 10 beats per minute.