The blade (2) has an associated relatively movable clamping element (6) which can be controlled by a handle (7,8). The clamping element has a flat surface and is set parallel to the blade. It reaches up to the cutting edge (4) of the blade at least in the area near the knife point (3). The clamping element can match the blade contour near the cutting edge. The clamping element is spring-loaded towards the blade to automatically bear against same.
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