Abstract
The purpose of this study is to develop a lighter and smaller power assist machine that can assist the user's arm to reduce burden on farm workers. The assist machine consists of a mounting part and a linkage mechanism in order to use a single actuator. In this paper, we used a linear motion actuator and a ratchet mechanism. The ratchet mechanism is used to assist the upper limbs without using an actuator. As a result, it is possible to keep the work posture of the upper limbs without controlling an actuator. The effectiveness of the improved power assist machines is verified by the result of the experiments.
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