| 摘要 |
PURPOSE:To make it possible to simply and appropriately adjust the airflow of electric fans of five groups consisting of a front and back group, a right and left group, and two center groups, by providing in each groups, means for simultaneously adjusting the airflows of electric fans. CONSTITUTION:Twenty electric fans 9 in total arranged in four columns and five rows are divided into five groups as indicated by A, B, C, D and E, knobs A1, B1, C1, D1, E1, are provided for the groups of the electric fans, respectively, so that the airflows of two to five of the electric fans 9 in each of the groups A through E may be simultaneously adjusted. With this arrangement, the airflows of the electric fans may be surely and briefly adjusted while observing the condition of papers, and thereby the working efficiency may be enhanced. |
