| 摘要 |
PURPOSE:To provide an image forming device constituted so that a normal copying action can be executed without stopping an image forming action even when the failure of a sensor is generated. CONSTITUTION:The image forming device executing a developing action by using a developing device 33 housing two-component developer is constituted so that developing sleeve 33A is operated at a linear velocity of 1.5-3.5 times as high as a photoreceptive drum 31 without stopping the image forming action even when the failure of the patch density sensor TS is caused in the midst of the image forming action. |
