Patent ID: 7748656

Claim:
A paper shredder blade for a paper shredder comprising two cylindrical cutting hobs rotating opposite to each other, with each hob including a polygonal shaft and a plurality of differential cutting blades mounted on the shaft, and a gasket being provided between two neighboring differential cutting blades, allowing the differential cutting blades on the two cylindrical hobs to be assembled alternately, with the cutting blades interleaving at a midpoint between the shafts to form a cutting nip; wherein each cutting blade is a differential blade is constituted by a set of two abutted secondary blades, each formed with at least one cut-off edge which is protruded outward from the circumference thereof, and an inner side secondary blades of the differential blade having a plurality of protruding standoff bumps surrounding an inner rim of the secondary blade; the two abutted secondary blades being formed by abutting the standoff bumps of one secondary blade with the standoff bumps of another secondary blade.