Dispenser for rolled sheet material

1. An apparatus for dispensing rolled sheet material comprising:

a housing defining an interior adapted to rotatably support rolled sheet material, the housing further defining a dispensing opening sized to allow sheet material to be dispensed therefrom; and

a floating nip within the housing, the floating nip positioned to restrain sheet material dispensed from the dispensing opening,

wherein the floating nip comprises a first nipping member comprising a curved surface and a second nipping member comprising a substantially planar surface,

wherein the curved surface impinges the substantially flat surface to nip sheet material being dispensed,

wherein the first nipping member further comprises first and second arms, the first and second arms being rotatable about first and second torsion springs, the first and second torsion springs biasing the curved surface towards the substantially flat surface,

wherein the second nipping member is rotatable about third and fourth torsion springs, the third and fourth torsion springs biasing the substantially flat surface towards the curved surface.

2. The apparatus of claim 1 wherein the position of the floating nip self-adjusts to accommodate a change in the angle at which sheet material is withdrawn from the dispensing opening.

3. The apparatus of claim 1 wherein the first nipping member is biased towards the second nipping member and the second nipping member is biased towards the first nipping member.

4. The apparatus of claim 1 wherein the curved surface has a radius of curvature smaller than 5 millimeters.

5. The apparatus of claim 1 wherein the curved surface has a radius of curvature smaller than 2 millimeters.

6. The apparatus of claim 1 wherein the first nipping member is rotatable about the first and second torsion springs within the housing through an angle greater than about 30 degrees.

7. The apparatus of claim 1 wherein the torsion springs are sized to provide a pressure in the nip low enough to allow sheet material to be withdrawn from the housing without breaking the sheet material and high enough to cause lines of weakness in the sheet material to break after the lines of weakness emerge from the nip during dispensing.

8. The apparatus of claim 1 wherein the first nipping member is rotatable about the first and second torsion springs within the housing through an angle greater than about 15 degrees.

9. An apparatus for dispensing rolled sheet material comprising:

a housing defining an interior adapted to rotatably support rolled sheet material and having a dispensing opening sized to allow sheet material to be dispensed therefrom;

a roll of sheet material having a plurality of zones of weakness that substantially extend across the width of the sheet material; and

a pivotable nip within the housing, the nip comprising a first nip member and a second nip member, the first nip member being resiliently biased against the second nip member, and the second nip member being resiliently biased against the first nip member;

wherein the first nip member and the second nip member are pivotable in operation, and

wherein said sheet material is dispensed along a path that extends from the roll of sheet material, through the pivotable nip, and through the dispensing opening.

10. The apparatus of claim 9 wherein the pivotable nip moves to accommodate changes in the angle at which the sheet material is withdrawn from the dispensing opening.

11. The apparatus of claim 9 wherein the rolled sheet material comprises inner and outer layers of sheet material, the layers of sheet material comprising a plurality of offset zones of weakness that extend substantially across the width of the sheet material.

12. The apparatus of claim 9 wherein the nip is pressurized.

13. The apparatus of claim 12 wherein the nip is pressurized by at least one spring.