A contact mechanism includes a current path having a 360\xb0 winding formed by a plurality of conductor sections and having an axis that is perpendicular to a plane in which a rotary contact body is movable. The system also includes post-sale customer feedback terminals for receiving more detailed customer feedback regarding the vendors from members after the sales have been completed. Stored data in the first storage device and the second storage device are determined by the first voltage and the second voltage. A torque profile is applied to the flywheel and a set of capture points is determined based on this torque profile An experimentally determined error value can be added to a capture point that is determined based on the model to account for differences between an actual robot and the model. The connector housing cures with the pivoting part in the closed position. It is possible to suck up dust that floats in the air around the vacuum cleaner, caused by air discharged when the vacuum cleaner is used and to purify the air.