GERAET ZUM STEUERN DER TONERNACHFUELLUNG IN EINEM ELEKTROPHOTOGRAPHISCHEN KOPIERGERAET.

摘要

Apparatus for controlling the replenishment of toner in an electrographic reproduction apparatus includes means for monitoring toner concentration in an electrographic developer mix, and means for monitoring the rate of toner depletion from such mix in developing electrostatic images. The outputs of such monitoring means are algebraically summed to provide a control signal for controlling toner replenishment.