| 摘要 |
PURPOSE:To delay the clogging of a filter, by shifting the position of the filter frames so that meshes are overlapped to reduce the mesh of a grating when said frames are made parallel. CONSTITUTION:Bust in air is adhered to meshes 27, 29 of a dust collection filter 19. When dust is accumulated, holders 9, 10 are detached and the two fold part of the dust collection filter 19 is opened to wash off the dust adhered to the meshes 27, 29 of a first filter 20 and a second filter 21. Because the grating of said filter 19 becomes coarse when the filter is opened, cleaning becomes easy.
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