| 摘要 |
A control mechanism for a toner monitor used in an electrographic reproduction apparatus having interchangeable developer stations, respectively containing developer material of different colors, and in which the toner monitor measures reflectivity of the developer material and produces a signal corresponding to the measured reflectivity in order to enable regulation of toner concentration. The mechanism comprises a sensor, associated with a developer station located in the reproduction apparatus, for differentiating between at least two colors of toner and producing signals corresponding respectively to such colors. In response to the corresponding to a particular color, a signal is produced representative of the concentration of toner of that color. The signals respectively representative of toner concentration are substantially equal for like toner concentrations. Addtionally, the control mechanism may log certain events important to the operation of the reproduction apparatus utilizing interchangeable developer stations, and may control adjustment of the toner concentration signal based on certain parameters.
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