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So far, we have developed a power-assisted wire suspension system to reduce operators' burden. It has three advantages. First, the structure is simple, and the cost is lower than that of other rigid systems, because the mechanism is based on an overhead crane. Second, it is easy to effect sequence control using this system because the sequence control is based on the velocity control. Finally, this system is expected to supply efficient conveyance by any operator, because operators can move heavy objects directly with two hands. In this paper, we summarize the design and the feature of the power-assisted system, and compare the effectiveness of the proposed power-assisted system with the conventional operation using buttons through experiments involving the measurement of the precision of the positioning and the work time needed to assemble objects.

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