| 摘要 |
A cartridge includes a developing apparatus equipped with a developer containing portion containing a developer, a residual developer amount detecting device for detecting a residual developer amount in the developer containing portion, and a storage device capable of storing latest residual developer amount information. An image forming apparatus includes a continuous rest time counter for counting a continuous rest time of a driving system of the image forming apparatus, and a control device which prohibits updating of the residual developer amount information to the storage device for a predetermined interval when the continuous rest time counter indicates a time not shorter than a predetermined time. Provided are an image forming apparatus and an image forming system in which no deterioration in detection accuracy is involved even if an unstable toner state occurs due to a long printing rest time.
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