Patent ID: 7447477

Claim:
A sheet processing apparatus comprising: an insertion sheet storing section that stores insertion sheets to be inserted into a bundle of sheets on which images have been formed, at desired pages thereof, the insertion sheets comprising a plurality of different types of insertion sheets and being set with a same orientation in said insertion sheet storing section; a sheet stacking tray on which the insertion sheets conveyed from said insertion sheet storing section and the sheets on which images have been formed are stacked; an insertion sheet feeding section that feeds the insertion sheets; an insertion sheet inverting section that inverts front and rear sides of at least one of the insertion sheets conveyed from said insertion sheet storing section; a sheet insertion controller that controls said insertion sheet feeding section to produce a bundle in which each of the insertion sheets are inserted into the sheets on which images are formed and which are to be stacked on said sheet stacking tray, at a predetermined page thereof; and an insertion sheet inversion controller that controls said insertion sheet inverting section to invert the front and rear sides of at least one of the insertion sheets conveyed from said insertion sheet storing section in accordance with a type of the insertion sheet, wherein the insertion sheet storing section comprises at least one tray each for storing the plurality of different types of insertion sheets in a single stack.