Displaceable and lockable chopper cutting edge

A chopper comprising a chopper housing (23) including a circumferentially extending retaining wall (22), said retaining wall having an inlet opening into said housing, at least one cutter (21) having a cutting edge (1a) rotatably mounted about an axis (20) within said housing and said cutting edge arranged to sweep over said retaining wall and past an opposing knife edge (1) located at the inlet opening to said housing, said cutting edge (1) is rotatable around a circle of revolution and maintains a gap with the retaining wall and opposing knife edge during rotation, said opposing knife edge (1) is elongated in the direction of rotation of said cutter and has a pair of opposite ends and is supported on a support (2), an adjustment device (3) for adjusting the gap between said opposing knife edge (1) and said cutting edge (1a) of said cutter (21), a locking device (4) for clamping said opposing knife edge in position, said adjustment device (3) being accessible at a location on the exterior of said chopper housing, wherein the improvement comprises that said locking device includes a clamping device (24) for pressing the opposite ends of said opposing knife edge (1) against said support (2), said clamping device (24) includes clamping means and a force accumulator for pressing the clamping means against said opposing knife edge, and a releasing device (6) acting counter to said force accumulator (5) for releasing the clamping of said opposing knife edge.