English to Greek Tech/Engineering Mechanics / Mech Engineering cutting device

It refers to a part of a cutting device for organic waste material (wood, branches, leaves, etc)

"A first known system is the disc chipper, where a number of knives is mounted in the plane of the large disc against which the wood is pushed and chopped off between the knives and a counterknife.

Cutting through the string of fibres [of wood] is done by sharp chopping knives, skimming closely along the anvil of the cutting device. It should be noted here that, at that moment the anvil acts as a counterknife".