Cutterhead for forage harvester

In a rotatable forage harvester cutterhead comprising

• a rotatable shaft,
• a plurality of axially spaced disc shaped plate members having substantially the same diameters and affixed in parallel planes transversely along said shaft for rotation therewith,
• a plurality of substantially flat knives, each knife having a cutting edge extending in a transverse direction less than half the axial length of the distance between the outermost discs, the improvement comprising
• a plurality of mounting members detachably secured to said plate members,
• a drum having an inner surface having a diameter at least as great as the diameters of said disc shaped plate members,
• attachment means for detachably securing said drum to said mounting members,
• a plurality of knife support assemblies comprising support blocks, said attachment means detachably securing said support blocks to the outer surface of said drum, and
• said knife support assembly further comprising fastener means for securing said knives to said blocks with the cutting edges extending in the direction of rotation of said cutterhead and generating a cylinder as the cutterhead rotates, said cylinder having a diameter larger than the diameter of said drum.