Developing apparatus

A developing apparatus for use with an image forming system including means for forming a static latent image having first and second portions of different surface potentials on a photosensitive layer, said apparatus comprising:

• housing means defining a first chamber for holding a quantity of developing agent and a second chamber downstream of said first chamber, and including means defining a passageway for establishing communication between said first and second chambers for permitting a portion of said developing agent to flow from said first chamber to said second chamber;
• a developing roller rotatably disposed in said second chamber and having means defining a dense plurality of hair-like structures extending from the circumferential surface of said developing roller for feeding said developing agent from said second chamber to the surface of said photosensitive layer, said hair-like structures contacting the surface of said photosensitive layer as said developing roller rotates in said second chamber;
• charging means operatively associated with said second chamber for electrically charging said developing agent which flows into said second chamber from said first chamber, said developing agent charged by said charging means being fed to the surface of said photosensitive layer by virtue of said developing roller and, thereafter, being attracted to said first portion with a strong attractive force and to said second portion with a weak attractive force;
• and
• means operatively associated with said photosensitive layer for electrically removing the developing agent attracted to said second portion.