This paper aims at development of a yoyo robot. Development of a yoyo robot raises the precision of a manipulator. In order to know a motion of the yoyo, Projection Method is used and modeling is carried out. Projection Method is the technique of carrying out modeling from a viewpoint of a constraint. If a motion of a yoyo is solved completely, it will be useful for development of a yoyo robot. It is assumed that the yoyo is attached to the tip of a manipulator. They carry out a simulation and it inquires.
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