Developer roller

Claim 3

An apparatus according to claim 1, wherein said controlling means includes a blade.

Claim 4

An apparatus according to claim 2, wherein the support member is made from a material having a hardness greater than the hardness of the polymeric coating thereon.

Claim 5

An apparatus according to claim 3, wherein the movement of the marking particles over the polymeric coating induces a triboelectric charge in the marking particles.

Claim 6

An apparatus according to claim 4, wherein the peaks of the support member of said transporting means comprise about 5% of the surface area of the support member.

Claim 7

An apparatus according to claim 5, wherein the spacing between adjacent peaks of the support member of said transporting means is about 10 microns.

Claim 8

An apparatus according to claim 6, wherein the support member of said transporting means includes a tubular member.

Claim 9

An apparatus according to claim 7, wherein said transporting means includes an elongated magnetic member disposed interiorly of and spaced from said tubular member.

Claim 10

An apparatus according to claim 8, wherein said blade includes a plurality of substantially equally spaced apertures through which the marking particles pass prior to being transported into the development zone.

Claim 11

An apparatus according to claim 9, wherein said blade is made from a stainless steel material.

Claim 12

An apparatus according to claim 10, wherein said tubular member is made from a metal material.

Claim 13

An apparatus according to claim 11, wherein the free edge of said blade has a hard, low friction coating plated thereon.

Claim 14

An apparatus according to claim 12, wherein the polymeric coating on said tubular member is made from a polyvinylidene fluoride based material.

Claim 15

An electrophotographic printing machine of the type having a photoconductive member arranged to have a latent image recorded thereon, wherein the improvement includes: a housing defining a chamber for storing a supply of marking particles therein; means for transporting the marking particles from the chamber in said housing to a development zone closely adjacent to the latent image recorded on the photoconductive member, said transporting means comprising a support member having the exterior surface thereof roughened forming a multiplicity of peaks extending outwardly therefrom with a coating of polymeric material filling the space between adjacent peaks so that at least a portion of the peaks of the support member extend beyond the coating of polymeric material thereon; and means for controlling the thickness of the layer of marking particles on said transporting means, said controlling means having a free edge contacting the peaks of the support member of said transporting means and being spaced from the polymeric material coated thereon.

Claim 16

An electrophotographic printing machine of the type having a photoconductive member arranged to have a latent image recorded thereon, wherein the improvement includes: a housing defining a chamber for storing a supply of marking particles therein; means for transporting the marking particles from the chamber in said housing to a development zone closely adjacent to the latent image recorded on the photoconductive member, said transporting means comprising a support member having the exterior surface thereof roughened forming a multiplicity of peaks extending outwardly therefrom with a coating of polymeric material filling the space between adjacent peaks so that at least a portion of the peaks of the support member extend beyond the coating of polymeric material thereon; and means for controlling the thickness of the layer of marking particles on said transporting means, said controlling means having a free edge contacting the peaks of the support member of said transporting means and being spaced from the polymeric material coated thereon.

Claim 17

A printing machine according to claim 14, wherein said controlling means includes a blade.

Claim 18

A printing machine according to claim 15, wherein the support member is made from a material having a hardness greater than the hardness of the polymeric coating thereon.

Claim 19

A printing machine according to claim 16, wherein movement of the marking particles on the polymeric coating induces a triboelectric charge therein.

Claim 20

A printing machine according to claim 17, wherein the peaks of the support member of said transporting means comprise about 5% of the surface area of the support member.

Claim 21

A printing machine according to claim 18, wherein the spacing between adjacent peaks of the support member of said transporting means is about 10 microns.

Claim 22

A printing machine according to claim 19, wherein the support member of said transporting means includes a tubular member.

Claim 23

A printing machine according to claim 20, wherein said transporting means includes an elongated magnetic member disposed interiorly of and spaced from said tubular member.

Claim 24

A printing machine according to claim 21, wherein said blade includes a plurality of substantially equally spaced apertures through which the marking particles pass prior to being transported into the development zone.

Claim 25

A printing machine according to claim 22, wherein said blade is made from a stainless steel material.

Claim 26

A printing machine according to claim 23, wherein said tubular member is made from a metal material.

Claim 27

A printing machine according to claim 24, wherein the free edge of said blade has a hard, low friction coating plated thereon.

Claim 28

A printing machine according to claim 25, wherein the polymeric coating on said tubular member is made from a polyvinylidene fluoride.