Patent ID: 7946565

Claim:
A bookbinding apparatus comprising: sheet-folding means for folding over sheets delivered sequentially from an incoming sheet conveyance path; stacking means for collating and stacking sheets from at least either said sheet-folding means or said incoming sheet conveyance path; binding-process means for binding together spine-portion edges of a sheet block from said stacking means; trimming means for trimming true the open edges of a sheet block that has been bound into a bundle; folding-position computing means for determining sheet position of folds made by the sheet folding means; and trim-amount computing means for computing length to which said trimming means trims; wherein said folding-position computing means is configured to preestablish, when a sheet is Z-folded by said sheet folding means, the position where the sheet is folded inward toward its spine portion, based on the trim depth, gotten from said trim-amount computing means, for the sheet fore-edge portion.