| 摘要 |
A cutter head includes a plurality of short cutter knives respectively mounted to flat rectangular trailing surfaces of angular blade retainers welded to the exterior of a cylindrical cutterhead drum. The knives each include a flat rectangular attaching flange, bolted to the trailing surface of a respective retainer, and a cutting or separating region configured in two different embodiments as a single trapezoid which is respectively coplanar with, or bent or twisted relative to, the attaching region. In third and fourth embodiments, the separating region is configured as a double trapezoid, with the third embodiment having the short sides of the trapezoids joined along a line of symmetry from which the separating region is bent in increasing amounts towards respective long sides of the trapezoids, and with the fourth embodiment having the long sides of the trapezoids joined along the line of symmetry in which case the separating region is bent from the attaching region an amount which increases toward the line of symmetry from the respective short sides of the trapezoids. Used together with the planar knives is a wedge-shaped shim which is sandwiched between the attaching region of the knife and a planar attaching surface.
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