| 摘要 |
<p>A punching tool comprises a plurality of knives, which constitute an annular array and are provided with wedge-shaped cutting edges. Each knife is vertically adjustably secured to a vertical knife holder. Adjacent knife holders are detachably interconnected by a projection of one knife holder and a groove, formed in an adjacent knife holder and by a screw, which extends through a bore in the projection and is screwed in a tapped bore at the bottom of the groove.</p> |
