| 摘要 |
Using an operation detection switch installed in the neighborhood of a conveying path between a photosensitive drum and fixing rollers for recognizing movement of sheets of paper P from a shift of reflected light from the sheets of paper, thereby independently detecting the conveying condition of the sheets of paper, when an occurrence of jamming of the sheets of paper is detected immediately, conveying of the sheets of paper is stopped and extension of jamming is prevented.
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