Abstract: A document shredder having first and second rotary cutting disks alternatively arranged and held in shredding engagement with one another to shred waste material into strips, first spacer members disposed in first gaps formed between the first rotary cutting disks, and second spacer members disposed in second gaps formed between the second rotary cutting disks. The first stationary cutting members have cutting edges held in shredding engagement with outer peripheries of the second rotary cutting disks in the first gaps to cut the strips into chip fragments in the first gaps. The second spacer members have cutting edges held in shredding engagement with outer peripheries of the first rotary cutting disks in the second gaps to cut the strips into chip fragments in the second gaps.

Abstract: An electrically driven desk-top shredder which comprises a housing, a drive motor secured within said housing, and a shredding mechanism driven by said drive motor. The shredding mechanism comprises a pair of rotary shafts driven in mutually opposite directions by said motor, a plurality of rotary disks mounted on said rotary shafts and having a plurality of shredding blade about the outer periphery thereof, and a plurality of spacer members each having at least one cutting edge that engages with the shredding plate of a respective rotary disk in a gap formed between a pair of adjacent rotary disks.