Toner dispenser arrangement

Abstract

A toner dispenser including a substantially enclosed dispensing hopper arranged to support a quantity of finely divided particulate material. The hopper is provided with an opening therein through which the material is dispensed by gravity to a developer sump. A cylindrical dispensing roll is rotatably supported in the hopper in or adjacent the opening with the roll surface in biasing contact with the interior wall surface of the container to form a movable seal for retaining particulate material within the hopper. The roll is formed of a resilient foamed elastomeric material having a textured outer surface with a plurality of open-cell cavities adapted to receive and support toner particles. The dispensing roll is rotated sequentially through the material in the hopper to load the open-celled cavities and then past at least one of the biasing surfaces wherein the surface of the roll is deformed sufficiently to cause toner thereon to be dispensed from the roll surface into the developer chamber. An antibridging apparatus is provided within the dispensing apparatus to maintain the contents of the container in a particulate state to ensure the uniform dispensing thereof, the antibridging apparatus comprising a web-like net mounted for rotation intermediate the roll and the walls of the hopper at the dispensing opening. The net may be driven by the frictional contact with the foam dispensing roll itself.