Patent ID: 8469348

Claim:
An image forming system comprising: an image forming section to print on sheets based on a print job including a plurality of page image data; a conveyance path through which the sheets printed by the image forming section are conveyed; a post-processing section which executes post-processing to form a booklet from a plurality of sheets conveyed through the conveyance path as a set unit; a plurality of overlapping sections each of which is disposed between the image forming section and the post-processing section, makes the sheets temporarily wait, forms a bundle of sheets by overlapping a plurality of waiting sheets with each other, or by overlapping the waiting sheets with a sheet being conveyed through the conveyance path, and conveys the formed bundle of sheets to the post-processing apparatus; a control section which, with respect to a second or later booklet set in case of continuously forming a plurality of booklet sets, controls a number of the plurality of sheets to be conveyed to the overlapping section, a conveying order of the sheets, and a timing to convey the formed bundle of sheets to a downstream side, based on a period of executing the post-processing by the post-processing section.