Patent ID: 8011650

Claim:
An image forming apparatus comprising: image forming means for forming an image on a sheet fed thereto; sheet post-processing means for physically executing sheet post-processing on the sheet on which the image is formed by the image forming means; setting means for setting sheet post-processing information including: post-processing-edge identifying information identifying a post-processing-edge of the sheet with respect to a longitudinal or a transverse sheet direction; and sheet post-processing-position identifying information identifying a sheet post-processing-position on the post-processing-edge, the post-processing edge having two ends; storage means for storing image information and the information set with the setting means; and control means for making the image forming means form the image on the sheet on the basis of the image information and the sheet post-processing information, and making the sheet post-processing means execute the sheet post-processing on the basis of the sheet post-processing information, wherein in a case where the sheet post-processing-position identifying information stored in the storage means indicates one of the two ends of the post-processing-edge, when changing the post-processing-edge to an edge adjacent to the post-processing-edge without changing a binding margin edge, the adjacent edge having the one of the two ends, the control means updates the post-processing-edge identifying information in accordance with the change and updates the sheet post-processing-position identifying information so that the sheet post-processing-position identifying information indicates the other end of the two ends of the adjacent edge, wherein the control means stores the post-processing-edge identifying information in the storage means as the sheet binding margin information before updating the post-processing-edge identifying information, and makes the image forming means form images so that the direction of each image is to be same for all the pages when sheets post-processed by the sheet post-processing means are turned-over on the basis of the sheet binding margin.