Abstract
It is necessary to do absorption of the impact and preliminary operation for the following jump at the same time to achieve a continuous jump. Then, the extension spring is built in. An extension spring extends because of the joint torque that occurred by a crash force at the time of the landing for knee joint to synchronize with the ankle joint and to move. As a result it made it to the structure that the knee joint and the ankle joint expand in the restoration power. The knee joint is excited in the sine wave at the resonance frequency of the installed spring in this research. An increase in the jump power by the use of the energy when landing is confirmed. We verify the utility of energy accumulative jump robot that uses the spring element.
