| 摘要 |
An image forming apparatus of the present invention comprises a developing device to form a positive image by supplying toner to an image carrier, a toner residual amount detecting unit to detect residual tone amount that can be supplied from the developing device, a comparing unit to compare a set toner consumption that is consumed under set image forming conditions with the residual toner amount, an advance warning signal output unit to generate an advance warning signal for generation of the interruption during the image forming before starting the image forming under the set image forming conditions when the result of comparison by the comparing unit is (Set toner consumption)>(Residual toner amount), and a display device to display the advance warning signal for generation of the interruption, and warns user the generation of interruption of the image forming operation in advance before starting the image forming operation and urges to prepare for avoiding the interruption of the operation.
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