| 摘要 |
An image forming system of the present invention includes an image forming section for forming an image on a sheet fed thereto. A stapler included in a finisher staples a stack of sheets each carrying image formed by the image forming section thereon. A controller causes the image forming section to form an image in accordance with input image data and causes the stapler to staple the stack of sheets at a preselected point or points. When sheets of different sizes are mixed together, the controller inhibits the stapler from stapling the stack except when the short edges of a large size sheet and the long edges of a small size sheet are identical in length in a direction perpendicular to the direction of sheet feed and when all the images printed on the sheets have the same orientation when the stapled stack is spread.
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