Patent ID: 8146903

Claim:
An apparatus for folding sheets comprising: a first crease roller having a first and second end; a second crease roller longitudinally aligned with the first crease roller, the first and second crease rollers each having segmented outer surfaces including grooves formed therein, the grooves of the first crease roller aligning with the grooves of the second crease roller to form a plurality of gaps along the length of the first and second crease rollers; a spacing device including a plurality of pitch rings and one of the plurality of the pitch rings is disposed on each of the first and second ends of the first crease roller, the pitch rings separating the first and second crease rollers to form a nip space between the outer surfaces of the first and second crease rollers, the nip space extending along a length of the first and second crease rollers, such that the first and second crease rollers do not engage each other along an entire portion of the first and second crease rollers extending between the pitch rings; and a crease blade disposed adjacent the nip space and adapted to urge the sheets toward the nip space, the crease blade having a plurality of projections extending therefrom, the projections being aligned with and extending into the plurality of gaps.