| 摘要 |
The device has a rounded knob (2) and a knob with a flat edge for resting against the edge of the grindstone (S) and the knifeblade (17) respectively. The flat-edged knob selects the desired angle and the first knob is adjusted according to the grindstone radius, so that, when the knobs are placed against grindstone and knifeblade, the desired knife-edge is obtained. |
