| 摘要 |
PURPOSE:To improve fixation property in the case that toner condensed and scattered by high-boiling solvent and low-boiling solvent is used. CONSTITUTION:A microcomputer 30 counts the number of copied sheets and detects the concentration of developer 24 in a developing tank 23 based on the detection signal of a CdS sensor 26 at the same time. Besides, it controls the replenishment of a toner bolt 21 and a developer bolt 22 so that the quantity of the toner and the developer is gradually made thin to the degree of 35g/780g (at starting time), 33.75g/780g (after thousand and five hundred sheets are copied), 32.5g/780g (after five thousand sheets are copied), 31.25g/780g (after seven thousand and five hundred sheets are copied) and 30g/780g (after ten thousand sheets are copied) every two thousand and five hundred sheets until ten thousand sheets from the starting time of copying. |
