Developer apparatus having mass sensor for an electrographic printer or copier

摘要

PCT No. PCT/DE97/02958 Sec. 371 Date Aug. 12, 1999 Sec. 102(e) Date Aug. 12, 1999 PCT Filed Dec. 17, 1997 PCT Pub. No. WO98/27468 PCT Pub. Date Jun. 25, 1998A developer unit for an electrographic printer or copier has a toner receiving surface designed to receive a coating of toner particles. A toner mass sensor and a toner charge sensor measure a coting of toner particles on the toner receiving surface and send signals to an evaluation unit which calculates a mass-referred toner charge.