Compact single component development system with modified...

G - Physics – 03 – G

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G03G 15/08 (2006.01) G03G 15/01 (2006.01) G03G 15/16 (2006.01)

Patent

CA 2120072

An electrophotographic apparatus in which toner particles are moved from the toner hopper or dispenser cartridge to the developer housing and onto the donor roller in a single component development system for use in color reprographic systems. A rotating holey tube toner agitator is modified to incorporate structure or grooves on the outer peripheral surface. Further, by placing a shrouded toner dispense auger inside the holey tube, the development system architecture stays compact and improved toner powder pushing through the pre-load of toner on the donor roller results, thereby insuring delivery of fresh toner evenly across the length of the developer housing. With more efficient pre- load, agitator rotational speed and bias can be reduced, leading to less toner effluents emanating from the developer housing without adversely affecting the cycle to cycle donor roller toner reload.

Cette invention concerne un appareil électrophotographique de reprographie couleur dans lequel les particules de toner sont acheminées d'une trémie ou d'une cartouche de distribution vers le révélateur et sur le rouleau donneur par un système intégré. L'agitateur de toner à rouleau perforé modifié comporte des rainures ou nervures sur sa périphérie extérieure. Par ailleurs, en plaçant une vis de distribution de toner fermée à l'intérieur du rouleau perforé, on obtient un système compact et un transfert amélioré du toner en poudre à travers l'étage de préchargement du toner sur le rouleau donneur, ce qui donne une couche de nouveau toner uniforme sur toute la longueur du révélateur. Avec un préchargement plus efficace, la vitesse de rotation de l'agitateur et sa polarisation peuvent être réduits, ce qui a pour effet de réduire les émanations de toner à la sortie du révélateur sans répercussion néfaste sur la recharge cyclique du rouleau donneur de toner.

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