between the sheets of paper of a paper stack are provided for leveling the paper stack furthermore gripping supporting components on the sides of the paper stack for uniform alignment of the side faces of the paper stack and at least one vibrating device for exact alignment of the sheets of paper application_number US 17910502 A description 0011 fig1 illustrates a front view of an outline of a paper stack 10 within a stacker of a printing press the left side of the paper stack being higher than its right side an even paper stack is illustrated with the dotted line and with the stack height a the uneven stacking of the sheets of paper on the paper stack 10 incurs an incorrect height on the left side of the paper stack 10 which is indicated by b and identifies a stacking error such errors in stacks occur for example because parts of the sheets of paper are printed unevenly or with a thicker toner layer than other parts in fig1 for example the left side of the paper stack 10 may have been printed with a thicker toner layer than the right side an exemplary calculation should make this fact of uneven stacking clear the individual sheets of paper in the stacks have a thickness of 100 u03bcm the thickness of the toner layer.