A pair of sheet accommodating sections separately accommodate sheets of the same size in different directions, i.e., in lateral and longitudinal directions; and the sections are selectively used so as to feed a sheet which corresponds to the placement of images to be formed on both sides of a sheet....http://www.google.com/patents/US5105230?utm_source=gb-gplus-sharePatent US5105230 - Image forming apparatus capable of selectively feeding a sheet longitudinally or laterally
