| 摘要 |
An image forming system includes image forming device and bookbinding device. Image forming device has operation unit for selecting sheet and cover and control unit for control of warning. Bookbinding device stacks plural sheets, forms a bundle of sheets, and binds a book by wrapping sheets with the cover in a square-shape. Bookbinding device has measuring unit measuring thickness of the bundle of sheets. Control unit calculates difference between length of selected cover, and sum of twice a length of selected sheet and a spine width, and determines warning, based on result of comparison between the difference and a predetermined value; executes determination of warning in first warning mode, based on result obtained with spine width of a set value, and/or in second warning mode, based on result obtained with spine width according to measured thickness of the bundle of sheets; and executes first warning mode prior to bookbinding output.
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