Nip rollers with removable disks

1. A nip roller comprising:

a shaft;

a first nip disk portion being a semi-annular disk;

a second nip disk portion being a semi-annular disk; and

an attachment section for removably securing the first nip disk portion and the second nip disk portion to the shaft, the attachment section including a first semi-annular attachment part configured to removably attach the first nip disk portion to the shaft and a second semi-annular attachment part configured to removably attach the second nip disk portion to the shaft,

the first semi-annular attachment part including a first mandrel, a first keeper and at least one first fastener and the second semi-annular attachment part including a second mandrel, a second keeper and at least one second fastener;

the at least one first fastener arranged and configured to force the first mandrel and the first keeper together so that first mandrel and first keeper grip the first nip disk portion; and

the at least one second fastener arranged and configured to force the second mandrel and the second keeper together so that second mandrel and second keeper grip the second nip disk portion.

2. The nip roller recited in claim 1 wherein at least a portion of the attachment section is fixed to the shaft.

3. The nip roller recited in claim 1 wherein the attachment section is configured to grip an inner circumference of the first nip disk portion and an inner circumference of the second nip disk portion.

4. The nip roller recited in claim 1 wherein the attachment section is a ring having an inner circumference that corresponds to an outer circumference of the shaft.

5. The nip roller recited in claim 1 wherein the attachment section includes a first portion fixed to the shaft, a second portion axially movable with respect to the shaft and a fastener arranged and configured to force the second portion towards the first portion so that the first and second portions grip the first disk portion and the second disk portion.

6. A nip roller comprising:

a shaft;

a first nip disk portion;

a second nip disk portion; and

an attachment section for removably securing the first nip disk portion and the second nip disk portion to the shaft,

the attachment section including at least one mandrel, at least one keeper and at least one fastener, the at least one fastener being adapted to force the at least one keeper and the at least one mandrel together so the at least one keeper and at least one mandrel grip the first nip disk portion and the second nip disk portion.

7. The nip roller recited in claim 6 wherein the first nip disk portion includes a first radial alignment section, the second nip disk portion includes a second radial alignment section and the at least one mandrel includes a first groove shaped to receive the first radial alignment section and a second groove shaped to receive the second radial alignment section.

8. The nip roller recited in claim 6 wherein the attachment section is arranged and configured such that the at least one fastener maintains contact with the at least one keeper and the at least one mandrel when the first nip disk portion and the second nip disk portion are detached from the shaft.

9. The nip roller recited in claim 6 wherein at least a portion of the attachment section is fixed to the shaft.

10. The nip roller recited in claim 6 wherein the attachment section is configured to grip an inner circumference of the first nip disk portion and an inner circumference of the second nip disk portion.

11. The nip roller recited in claim 6 wherein the attachment section is a ring having an inner circumference that corresponds to an outer circumference of the shaft.

12. The nip roller recited in claim 6 wherein the first nip disk portion and the second nip disk portion are semi-annular disks.