| 摘要 |
To indicate a remaining portion of a photosensitive sheet roll of material a method and apparatus are provided. A rotation detector is secured to a rotation system rotatively supporting a photosensitive sheet roll. A measuring device measures the amount of rotation of the photosensitive sheet roll, detected by the rotation detector, within a predetermined time or during a period of one cycle of an image forming process. An indicating device indicates the remaining amount of the photosensitive sheet roll according to the rotation amount measured by the measuring device.
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