| 摘要 |
PROBLEM TO BE SOLVED: To prevent a change of the document moving speed in a reading part due to the load fluctuation when a rear end of a paper sheet is drawn from a paper sheet separating device in an ADF using the retard roller separating method. SOLUTION: As paper sheet carrying device for ADF 1, a paper sheet separating device 10, a carrying roller device 15, a reading roller device 20 formed of a large diameter driving roller 21 at a curved part and pinch rollers 22, 22a are arranged, and an image of a document to be carried at a constant speed is read by a scanning device set in a platen 23. The carrying speed v1 in the carrying roller device is set a little higher than the carrying speed v2 in the reading roller device so as to generate a sag of the paper sheet inside of a curved passage 19, and the speed fluctuation to be generated when a rear end of the paper sheet is drawn from the paper sheet separating device 10 is absorbed by the sag of the paper sheet.
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