| 摘要 |
PROBLEM TO BE SOLVED: To provide a method to continuously and accurately measure the electrified quantity and the fed quantity of developer fed by a developing roller. SOLUTION: The evaluating method for the electrified quantity and the fed quantity of the developer by which a developing device is driven by providing a toner image forming body 9 consisting of a metal material substituted for the actual photoreceptive drum of the developing device so that one surface comes into contact or is close to the developing roller 3, and the electrified quantity and the fed quantity of the developer fed to the developing roller 3 are evaluated based on the sticking state of the developer to the toner image forming body 9 is provided. |
