Pneumatic spring for SED resistance brush commutator

An apparatus for developing a latent image recorded on a surface, including:

• a housing defining a chamber storing at least a supply of toner therein;
• a donor member spaced from the surface and adapted to transport toner from the chamber of the housing to a development zone adjacent the surface;
• a plurality of electrodes longitudinally disposed on the donor member;
• a commutator brush contacting the electrodes along a portion of the circumference of the donor member, said commutator brush including means for generating pneumatic force to move said commutator brush into contact with the electrodes and a back plate having a plurality of brush filaments attached thereto,
• an end cap for supporting said donor member, said end cap having a cavity defined therein for holding said commutator brush,
• a blower for supply air to said cavity in a space above said back plate thereby providing pneumatic force to move said commutator brush into contact with said electrodes and wherein said back plate has a plurality of apertures defined therein, said apertures allow air to flow therethrough to clear toner and ozone from said portion.