| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner catching system in which the life of a toner filter is uniform and whose noise is low. SOLUTION: A first air path 33 is formed to make one toner filter 35 correspond to attracting ports 31K and 32K provided in the vicinity of a developing device 21K for a black color, and a second air path 34 is formed to make the other toner filter 36 correspond to attracting ports 31C, 31M, 31Y, 32C, 32M, and 32Y provided in the vicinity of the rest of the developing device 24C, 24M, and 24Y. The flow rate of ventilating fans 37 and 38 being a toner attracting force source is controlled based on the density of an image to be formed and whether the image to be formed is a black and white image or a collor image. |
