| 摘要 |
An image forming apparatus capable of automatically and accurately judging whether or not the number of sheets of paper in a paper storage part is adequate for the number of copies to be made from the weight of paper in the paper storage part is provided. An image forming apparatus 100 comprises a paper storage part 50; weight sensors 10a, 10b and 10c for measuring the weight of paper stored in the paper storage part 50; a paper feed counting part for counting the number of sheets fed from the paper storage part; a memory unit 20 for storing the weight A applied to the weight sensors, exclusive of the weight of paper, the weight B of standard paper, and the set number C of sheets for checking that specifies the intervals at which the remaining quantity of paper is to be checked; a control panel 30; and a CPU 40. The CPU calculates the remaining quantity of paper from the weight measured with the weight sensors by using the weight B of standard paper only at the time of starting. Thereafter, the CPU accurately calculates the actual weight of each sheet of paper from a change in paper weight per feed of the set number C of sheets for checking and gives a warning when the remaining quantity of paper is not adequate for the number of copies to be made.
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