Patent ID: 7706736

Claim:
An image forming system including an image forming apparatus and a post-processing apparatus that performs post-processing on sheets discharged from the image forming apparatus, the image forming system comprising: a feeding unit configured to store a plurality of sheets and successively feed the sheets; an image forming unit configured to form an image on a sheet according to a setting content of an image formation job; a stack unit configured to stack sheets processed by the post-processing apparatus; a state detection unit configured to detect a predetermined state of the stack unit, the predetermined state being a state in which the stack unit cannot receive any sheet; a control unit configured to determine, based on the setting content of an image formation job, a number of sheets that the post-processing apparatus can receive from the image forming apparatus after detection of the predetermined state; and a sheet number detecting unit configured to detect a number of sheets existing in a sheet conveyance path extending from the feeding unit to the stack unit; wherein the control unit is operable to restrict a number of sheets fed from the feeding unit so that the number of sheets detected by the sheet number detecting unit does not exceed the determined number of sheets.