Patent ID: 7620341

Claim:
An image forming device having as a first mode a paper stacking operation in a first mode-facing direction selected from a group consisting of a face-up process and a face-down process, the image forming device comprising: a printing unit operable to print on a plurality of pieces of paper data for a plurality of pages; an intermediate tray operable to support a stack of the plurality of pieces of paper; a stapler positioned at a predetermined position; an input unit operable to receive user input indicating, as a paper facing choice, one of the face-down process or the face-up process and a choice of one-sided printing or two-sided printing; and a control unit operable to control the image forming device so as to stack the plurality of pieces of paper in a predetermined order by the printing unit in the intermediate tray when performing either of the face-down process and the face-up process, to staple the plurality of pieces of paper at the predetermined position to create a sheaf, and to discharge the sheaf, wherein the control unit controls the image forming device so as to perform two-sided printing regardless of the user input received by the input unit and to reverse the predetermined order of the stacking, when user input indicated as the paper facing choice indicates the other-facing direction from the first mode-facing direction.