There are apparatus and methods for generating a plurality of voltage levels. The present invention thus sets the print duty for a nozzle located at an end of a nozzle array formed in a print head on the basis of the end deviation amount of a position impacted by an ink droplet ejected from the end of the nozzle array. Paths are established over each core separately and weights are assigned to the two routes. In accordance with a method, the cutting implement is located adjacent a wall covering so that the blade surround a damaged portion of the covering. The movable strap parts intersect each other at the rear portion and can move in relation to the upper part.