Patent ID: 8712315

Claim:
An image forming system including a printing unit which prints an image on a recording sheet, and a wrap bookbinding unit which performs wrap bookbinding of a batch of recording sheets including a plurality of document sheets on which images are printed by the printing unit, the image forming system comprising: a thickness detection unit configured to detect a thickness of a batch of recording sheets stacked on a tray of the wrap bookbinding unit; a wrap bookbinding control unit configured to cause, when the thickness of the batch of recording sheets detected by the thickness detection unit exceeds a binding thickness threshold value corresponding to a maximum binding number of recording sheets of the wrap bookbinding unit, the wrap bookbinding unit to perform wrap bookbinding to create one or a plurality of volumes in each of a plurality of chapters; a relevant information printing control unit configured to cause the printing unit to print an image of relevant information, indicating a relationship of the plurality of volumes and the plurality of chapters, on a cover sheet used to wrap each volume; and a determining unit configured to determine a k-th volume binding number of recording sheets to be created for a k-th volume of the volumes in an x-th chapter of the chapters, and characters indicating a chapter number and a volume number to be printed for the k-th volume, wherein, each time the k-th volume binding number of recording sheets for the k-th volume is reached, the wrap bookbinding control unit causes the wrap bookbinding unit to perform the wrap bookbinding to create the k-th volume and causes the printing unit to print the characters indicating the chapter number and the volume number on a spine of a cover sheet for the k-th volume.