this paper feeding mechanism comprises a first spring for biasing a stack of paper against a belt for driving one or two sheets of paper from the stack toward a gap which is slightly larger than the width of one sheet of paper , and a second spring for flattening the selected sheet or sheets against the belt just prior to entering the gap . the belt is held solidly in position by a backing teflon block to form one side of the gap , and a sharp edge that is positionally adjustable forms the other side . the sharp edge is rounded slightly to compensate for the possibility of mechanical inaccuracies , and the second spring presses the paper against the belt just prior to the knife edge for more reliable operation with stiff paper .