| 摘要 |
PURPOSE:To carry out highly accurate oblique advance correction continuously, by detecting an oblique advance quantity of a document to be carried through a circulation path arranged between an inserting section and a discharging section every time when the document circulates, and driving a correction guideboard through a step motor. CONSTITUTION:A document is inserted through a document inserting section 1 and fed by means of carry rollers 2-7 to a discharging section 8. A circulation path corresponding to the length of the document is formed by a roller 3 and any one of rollers 4-6 so as to circulate the document by such times as equals to the number of sheets to be copied. Two document detection sensors PS4a, PS4b are arranged at positions crossing perpendicularly with the carrying path at the feed-out side of the roller 4 so as to detect oblique advance quantity of document. A step motor M2 is driven corresponding to the detected oblique advance quantity so as to rotate an oblique advance correction board 31. The oblique advance correction board 31 is arranged along the axial direction of the roller 3 and rotates on a horizontal plane around a vertical shaft 32 in the center of the carrying path. Consequently, oblique advance of document is corrected every time when the document circulates and the document is subjected to highly accurate correction.
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