PURPOSE:To use the whole device even in a small space by driving a dust transporter by an induced type linear motor system, which transporter carries dust collecting on each. CONSTITUTION:At one surface of a base plate 13, there are provided a primary coil 17 for moving rails 5, 7 and joint rails 5b, 7b serving as secondary conductor, and a brush for supplying electric power from a trolley to the primary coil 17 coming into contact with the trolley at all time. A dust transporter 11 supplies to the primary coil 17 with electric power from the above trolley, and according to this, eddy current which is induced current is generated on the moving rails 5, 7 and the joint rails 5b, 7b serving as the secondary conductor by a magnetic field generated in the primary coil 17 to make the dust transporter run between the above storage and discharge equipment and dust collecting posts on respective floors based on the principle of a general induced type linear motor.
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