| 摘要 |
PURPOSE:To prevent a wrong developer from being replenished, by constituting plural developer replenishing means provided in accordance with an image formation mode, so that the respective empty states can be displayed separately by each separate display means positioned in the vicinity of the respective means. CONSTITUTION:When a toner in toner bottles 23, 24 becomes absent, the toner does not enter a hole 31a of a toner replenishing gear 31, and an LED light beam of reflection type photocouplers (detecting means) 38a, 38b in each toner replenishing hopper 21, 22 which has been provided on the lower part of a gear holder made of a transparent material is reflected by a part which has turned around the lower face of a control collar 34 of a plate spring 37. Subsequently, the photocouplers 38a, 38b become on, and it is detected that the toner has become empty. LEDs 41, 42 are turned on, the toner empty state of the toner replenishing hopper 21 or 22, related to its detection is displayed separately in their vicinity, and which one of the toner replenishing hoppers 21, 22 is in an empty state is informed clearly to an operator. |
