| 摘要 |
A layer of synthetic material 12, e.g. polytetrafluoroethylene, is provided between a wedge 9 and a cutting blade 2. The material may also be provided between the other side 11' of the wedge and the groove 3 or the wedge may be coated with the material. Because of the lower friction, the cutting blade may be clamped without additional intermediate components which enables the grooves to be smaller and a greater number of cutting blades to be positioned around the cutting head. <IMAGE> |
