Image forming apparatus in which a print mode of a document image can be arbitrarily selected

An image forming apparatus comprising:

• an image reading section including an auto document feeding section to convey stacked documents one by one to a scanner section;
• an image forming section to form an image on a sheet conveyed to a printing section based on image information read by the image reading section;
• a manual feed tray section to stack sheets;
• a document width detection sensor to detect, as a document width, a length of a document stacked on the auto document feeding section in a direction orthogonal to a document conveyance direction;
• a sheet width detection sensor to detect, as a sheet width, a length of a sheet stacked on the manual feed tray in a direction orthogonal to a sheet conveyance direction;
• a print pattern memory to store, correspondingly to sheets of various sizes, print patterns each showing the whole area of a document image printed on a sheet having one of the various sizes;
• a control section which receives, as input information, sheet width detection information from the sheet width detection sensor and document width detection information from the document width detection sensor, selects one or a plurality of the print patterns based on the input information from the print pattern memory, displays combinations of the selected print patterns and a document size pattern on a monitor;
• and
• a print pattern selection section by which a user selects one of the combinations displayed on the monitor, according to which the document image is printed on the sheet stacked on the manual feed tray.