| 摘要 |
An automatic document feeder which is capable of preventing the occurrence of jams that would be caused when a bundle of originals in which originals having lengths in a conveying direction equal to or greater than a predetermined reference length and originals having lengths shorter than the reference length are mixed are conveyed in a high-speed double-sided mode. When the originals are sequentially conveyed, a length of a respective original is detected. If the detected length of a preceding original being conveyed in the high-speed double-sided mode is equal to or greater than a predetermined length, the high-speed double-sided mode in which conveyance of the next original is started after start of non-reading conveyance of the preceding original is switched over to a normal double-sided mode in which the conveyance of the next original is started in advance of the non-reading conveyance of the preceding original.
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