Abstract
With the improvement of living standards, the tennis sports has developed quickly, which largely promotes the development of tennis-related equipment .The tennis machine is an important part of them, which can assist one person to practice and improve tennis skill alone. Today, most of the tennis machines in the market usually make use of electrical energy to convert it into mechanical energy. The design of the tennis-serving machine aims at throwing the ball without the electrical energy. It does not need external energy sources and is mainly used for teaching and practicing beginners. The overall structure is designed on the base of a bike by making several changes. It takes advantage of the ratchet to rotate in one direction. It works by the manpower, and the rotating wheel is driven by the growth of the rate of transmission to squeeze the ball out. The main technical indicators of this design are pure manual labor, simple structure, less demanding of the technology and lower cost.
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