| 摘要 |
PROBLEM TO BE SOLVED: To raise the operating efficiency of a cleaning device by preventing pollution of the working environment and a waste of abrasive grains both resulting from scatter of abrasive grains and dispensing with halts of the cleaning device while cleaning objects are changed. SOLUTION: A plurality of storage chambers 2a and 2b for accommodating abrasive grains Q are intercommunicated via a two-way passage 3 for vacuum airflow A, and are further communicated with a vacuum means P via a selector valve 10. The vacuum direction is changed over at intervals of preset periods via the selector valve 10, when a main portion 21 of a cleaning object 20 is exposed to the two-way passage 3 for surface cleaning.
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