| 摘要 |
PURPOSE:To carry out refreshing processing of toner according to the degree of deterioration of the toner on a developing sleeve in the image forming device such as a copying machine or a printer. CONSTITUTION:First, a photosensitive body 1 is controlled to have a potential of approximately zero, and bias voltage of the same polarity as the toner is impressed on the developing sleeve 11. Thus, the toner from the developing sleeve 11 is stuck to the photosensitive body 1, and a specified reference image is formed. Electric charge in the photosensitive body 1 generating with formation of this reference image is accumulated to a condenser 6, and by measuring this accumulated electric charge quantity by a control device 7, judgement of the degree of deterioration of the toner is carried out based on this electric charge quantity. Then, a greater bias voltage than at a normal image formation is impressed on the developing sleeve 11 based on the detected result, and the deteriorated toner on the developing sleeve 11 is discharged onto the photosensitive body 1. |
