| 摘要 |
PURPOSE:To prevent display indicating no toner regardless of the existence of the toner due to detection error of a toner residue quantity sensor in the developing device where the toner inside a toner container is replenished to developer when the toner concentration is lowered in a two component developer and the residual toner quantity in the toner container is detected by the residual toner quantity sensor. CONSTITUTION:When the toner T is refilled to the toner container 8 and the existence of the toner is detected by the first residual toner quantity detection sensor 12, this information is retained until the fact that the toner quantity inside the toner container is below a specified quantity is detected by a second residual toner quantity sensor 112, and during this time, even when a detection error is made by the first residual toner quantity sensor 12, the display indicating no toner is inhibited from being carried out. |
