Abstract: This invention relates to a paper shredder. A first stage shredder accepts paper from a hopper. The first stage shredder includes two knife shaft assemblies with a plurality of sequentially oriented knives and spacers on hexagonal shafts. A second stage shredder accepts the output of the first stage shredder. The second stage shredder has two counter rotating shafts with saw tooth disk knives and separating spacers and cuts the paper finer than that of the first stage shredder. A third stage shredder may be connected to the second stage shredder providing even further paper size reduction.

Abstract: This invention relates to a paper shredder. A first stage shredder accepts paper from a hopper. The first stage shredder comprises two knife shaft assemblies with a plurality of sequentially oriented knives and spacers on hexagonal shafts. A second stage shredder accepts the output of the first stage shredder. The second stage shredder has two counter rotating shafts with saw tooth disk knives and separating spacers and cuts the paper finer than that of the first stage shredder. A third stage shredder may be connected to the second stage shredder providing even further paper size reduction. Each of the second stage shredder and third stage shredder may be disengaged from the shredding process. The first stage, second stage and third stage shredders are interlocked electronically so that if any stage suffers a jam the preceding stages are stopped. The jammed stage is reversed to remove the jam and all preceding stages stop until a signal is provided to restart.