| 摘要 |
A cutting apparatus including a grinder assembly for grinding and sharpening the knives in the cutting assembly is disclosed. The cutting apparatus comprises, a mouth defined by a jaw assembly for delivering the material to be cut to a cutting position at the mouth, a cutting drum having at least one knife the, or each, knife having a cutting edge, the cutting drum having drive means therefor and being rotatable about an axis arranged substantially parallel to the mouth such that the cutting edge of the at least one knife is arranged substantially perpendicular to the material to be cut. A grinder is described for removing material from the cutting edge of the at least one knife, the grinder being configured to be brought into contact with the cutting edge with a movement in a first direction substantially parallel to the axis of rotation of the cutting drum and with a movement in a second direction substantially opposite to the first direction and substantially parallel to the axis of rotation of the cutting drum, wherein the grinder is configured to execute the movement in the first direction at a substantially uniform first speed and the movement in the second direction at a substantially uniform second speed, wherein the first speed is different to the second speed. |
