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Easy Tennis-Serving Machine for Teaching Purpose

机译：易于网球服务机用于教学用途

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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.
机译：随着生活水平的提高，网球体育迅速发展，这主要促进了网球相关设备的发展。网球机是其中的重要组成部分，可以帮助一个人单独练习和改善网球技能。如今，市场上的大多数网球机通常利用电能将其转换为机械能。网球服务机的设计旨在抛出球而没有电能。它不需要外部能源，主要用于教学和练习初学者。通过进行几种变化，整体结构设计在自行车的基础上。它利用棘轮在一个方向上旋转。它由人力工作，旋转轮由传动速率的增长驱动，以挤出球。这种设计的主要技术指标是纯粹的手工劳动力，结构简单，苛刻的技术要求和更低的成本。

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