Patent ID: 7500663

Claim:
A bookmaking apparatus comprising: first and second paths intersecting each other; a sheet bundle conveyance device for conveying a sheet bundle along the first path; a cover sheet conveyance device for conveying a cover sheet along the second path; and a joining stage disposed at the intersection of the first and the second paths, the joining stage operable to join the sheet bundle and cover sheet in a substantially upside-down T-shape; wherein the cover sheet conveyance device is equipped with a first aligning device for aligning an edge of the cover sheet in a direction of conveyance, and a second aligning device for aligning a side edge perpendicular to the direction of conveyance, and the first and the second aligning devices are arranged on the second path at an upstream side of the joining stage, and the cover sheet conveyance device is equipped with an offset conveyance device capable of adjusting a conveyance amount of the cover sheet positioned by the first and the second aligning devices according to a length direction of sheet conveyance to the joining stage at a downstream side, the offset conveyance device comprising an operation device for calculating a conveyance amount of the cover sheet aligned by the first and the second aligning devices according to a thickness of the sheet bundle.