A sheet processing apparatus includes a sheet-table unit, a sheet-separating unit, a convey unit, a discharge unit, a sheet processing unit, and a sensor arranged at an upstream end of the convey unit and spaced from the discharge unit with a predetermined distance. To form the plate, material having non-wetting characteristics can be provided as a surface of a transfer block. At least some of the tasks have competing requirements for use of regions of the database. The widthwise readout lines are electrically connected to the lengthwise readout lines.