Patent ID: 7627275

Claim:
A device to supply toner within an image forming apparatus, the device comprising: a toner supply member; said member having a foamed elastic body comprising: a cell size in a range of about 250 microns to about 900 microns; a density in a range of about 2 pounds per cubic foot to about 8 pounds per cubic foot; a porosity value in the range of about 0.12 to less than 1.0; and a resistance less than about 1E9 ohms; and a developer member wherein a nip width shared by said toner supply member and said developer member is in a range of about 0.5 mm to about 1.5 mm, a surface velocity ratio between said developer member and said toner supply member is in a range of about 0.7 to about 1.7, and a toner contact value is greater than 2.