Replenisher mechanism for a reproduction apparatus development station with continuous monitoring of remaining marking particle material

This invention relates in general to a replenisher mechanism for a developer station of a reproduction apparatus, and more particularly to an electrographic reproduction apparatus development station where the replenisher mechanism for resupplying of marking particle material to a reproduction apparatus development station provides highly accurate and continuous monitoring of the amount of marking particle material remaining in the housing of the replenisher mechanism so as to determine when and how much marking particle material to add to the replenisher mechanism. A mechanism for replenishing particulate material from receptacles to a reservoir, which provides a highly accurate and continuous indication of the amount of particulate material remaining in the housing of the replenisher mechanism. The replenisher mechanism includes a housing having a plurality of discrete sensors for sensing the level of particulate material within the housing, a delivery assembly which provides flow communication of particulate material between the housing and a remote reservoir, and has a delivery assembly sensor that senses the amount of particulate material delivered by the delivery assembly. A logic and control unit operatively connected to the housing level sensors and the delivery assembly sensor continuously determines the amount of particulate material remaining in the housing so as to indicate when, and how much, particulate material to add to the housing.