| 摘要 |
In a copying machine including a sensor for detecting the concentration of a developer within a developing unit, and a developer supply unit for supplementing a developer into the developing unit when the concentration of the developer detected by the sensor is lower than a predetermined value, a warning device is provided which includes a counter for counting the number of copies being made and capable of being reset each time the developer is supplemented from the developer supply unit onto the developing unit. A warning unit is also provided which is indicates when the number of copies counted by the counter exceeds the maximum possible number of copies that can be made until the concentration of the developer fully contained in the developing unit decreases to a value lower than a predetermined value.
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