Three roll fuser
AssigneeXerox Corporation
InventorsPaul M. Fromm, Rabin Moser, James E. Mathers
Life of this patent
Estimating the term…
Abstract
A three roll fuser incuding a fuser roll, pressure roll and a backup roll. The backup roll is crowned and is supported in pressure engagement with the fuser roll to form a first nip while the fuser roll is also supported in contact with the pressure roll. The pressure engagement of the crowned roll with the fuser roll eliminates nonuniform nip loading in wide fusers as well as providing uniform velocity through the fuser roll/pressure roll nip.
Claims12
Apparatus for fusing toner images to substrates, said apparatus comprising:
- a relatively long heated fuser roll structure, said heated fuser roll structure having a uniform diameter and a length in the order of 24 to 36 inches;
- a relatively long pressure roll structure supported for pressure engagement with said heated fuser roll to form a nip therebetween, said pressure roll structure having a uniform diameter and a length in the order of 24 to 36 inches;
- means cooperating with said fuser and pressure rolls for effecting uniform pressure and velocity in said nip.
A method for fusing toner images to substrates, said method including the steps of:
- providing a relatively long heated fuser roll structure having a uniform diameter and a length in the order of 24 to 36 inches;
- supporting a relatively long pressure roll structure having a uniform diameter and a length in the order of 24 to 36 inches in pressure engagement with said heated fuser roll to form a nip therebetween;
- effecting uniform pressure and velocity in said nip.
Apparatus for fusing toner images to substrates, said apparatus comprising:
- a relatively long heated fuser roll structure said heated fuser roll structure having a length in the order of 24 to 36 inches;
- a relatively long pressure roll structure supported for pressure engagement with said heated fuser roll to form a nip therebetween, said pressure roll structure having a length in the order of 24 to 36 inches;
- means for effecting deflection of said roll structures for effecting uniform pressure and velocity in said nip.
A method for fusing toner images to substrates, said method including the steps of:
- providing a relatively long heated fuser roll structure having a length in the order of 24 to 36 inches;
- supporting a relatively long pressure roll structure having a length in the order 24 to 36 inches in pressure engagement with said heated fuser roll to form a nip therebetween;
- deflecting said roll structures for producing uniform pressure and velocity in said nip.
Dependencies are inferred from the claim text.