| 摘要 |
<p>A first razor blade (11) having cutting edge nearest to a protective element (2) has a negative exposure of at the most 0.2 mm, whereby this exposure represents a geometrical distance of the first razor blade (11) cutting edge to a plane being tangential to the protective element (2) and to a second razor blade (12) cutting edge. A third razor blade (13) having its cutting edge nearest to a cover (3) has a positive exposure of at the most +0.2 mm, whereby this exposure is a geometrical distance of the third razor blade (13) cutting edge to a plane, being tangential to the second razor blade (12) cutting edge and to the cover (3) and the second razor blade (12) exposure is either above or below a plane being tangential to the first razor blade (11) cutting edge and to the third razor blade (13) cutting edge, whereby the value of the second razor blade (12) exposure with respect to this plane is within the range extending between the exposures of the first razor blade (11) and the third razor blade (13).</p> |
