Patent ID: 7866643
Filing Date: 2011-01-11
Classification: B42C

Abstract:
1. An image forming system including an image forming apparatus which forms an image on a book-body sheet and a book binding apparatus which conducts book binding by encasing a bundle of book-body sheets with a U-shaped cover sheet, the image forming system comprising: a first detection section which detects a maximum book-body sheet length and a minimum book-body sheet length among length of sheets in the bundle of the book-body sheets; a second detection section which detects a thickness of the bundle of the book-body sheets; a third detection section which detects a cover sheet length; a selection section to select whether the cover sheet length is determined based on the maximum book-body sheet length or on the minimum book-body sheet length; a calculation section which calculates a cutting amount of the cover sheet based on the maximum book-body sheet length detected by the first detection section, the thickness of the bundle of the book-body sheets detected by the second detection section and the cover sheet length detected by the third detection section when selected is that the cover sheet length is determined based on the maximum book-body sheet length by the selection section, and which calculates a cutting amount of the cover sheet based on the minimum book-body sheet length detected by the first detection section, the thickness of the bundle of the book-body sheets detected by the second detection section and the cover sheet length detected by the third detection section when selected is that the cover sheet length is determined based on the minimum book-body sheet length by the selection section; a trimming section which cuts the cover sheet based on the cutting amount of the cover sheet calculated by the calculation section; and a book binding section which conducts a book binding by encasing the bundle of sheets of the book-body with the U-shaped cover sheet.