Patent ID: 6851666

Claim:
A method of producing a booklet of a document file, comprising the steps of: forming images of the document file on both sides of a sheet by an image forming apparatus and discharging the sheet therefrom, the sheet is being selected from a full-size sheet set to be conveyed in its longitudinal direction and a half-size sheet half a size of the full-size sheet and set to be conveyed in its lateral direction; receiving the sheet discharged from the image forming apparatus, detecting if the received sheet is the full-size sheet conveyed in its longitudinal direction or the half-size sheet half conveyed in its lateral direction, and further conveying the received sheet; folding the received sheet in two at its center portion in a direction the received sheet is conveyed when the received sheet has been detected to be the full-size sheet in the receiving step and further conveying the folded received sheet with the folded center portion thereof being served as a leading edge of the folded received sheet, and conveying the received sheet without folding the received sheet when the received sheet has been detected to be the half-size sheet in the receiving step; receiving and jogging the received sheet, conveyed one after another, to be stacked one upon another; binding the stacked received sheets at their leading edge portions in a direction the received sheets have been conveyed; and discharging the bound received sheets as the booklet.