| 摘要 |
According to the present invention, in order to prevent developer which remains in excess alter the height of the developer has been regulated from being accumulated on a partition plate (8) even during the time when the developing apparatus is under the nondriven condition, the partition plate is provided with holes (9) formed in a surface (8a) facing a toner-concentration sensor (11), for allowing the developer (8a) fall down therethrough, or an AC voltage is applied to the partition plate during the time when the developing apparatus is under the nondriven condition, or the partition plate is adapted to be swung or vibrated during the time when the developing apparatus is under the nondriven condition, or the partition plate is adapted to be movable so that the position of the partition plate during the time when the developing apparatus is under the nondriven condition may be different from that during the time when the developing apparatus is being driven. |
