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Cleaning Station for an Electrographic Copying Machine

IP.com Disclosure Number: IPCOM000086204D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Boman, C: AUTHOR [+2]

Abstract

Charged toner cleaned from a photoconductor member, not shown, by the cleaning brush is transmitted in the direction of the arrows into a cleaning station past a scavenger roll. The scavenger roll is electrically charged to a potential opposite that of the toner, thereby attracting the toner to the roll. Toner residing on the roll is scraped for deposit into an auger for returning toner to a toner cartridge, not shown. A filter assembly captures toner particles not attracted to the scavenger roll. Air carrying the toner is exhausted out of the machine after suitable cleaning by the filter.

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Cleaning Station for an Electrographic Copying Machine

Charged toner cleaned from a photoconductor member, not shown, by the cleaning brush is transmitted in the direction of the arrows into a cleaning station past a scavenger roll. The scavenger roll is electrically charged to a potential opposite that of the toner, thereby attracting the toner to the roll. Toner residing on the roll is scraped for deposit into an auger for returning toner to a toner cartridge, not shown. A filter assembly captures toner particles not attracted to the scavenger roll. Air carrying the toner is exhausted out of the machine after suitable cleaning by the filter.

The efficiency of the scavenger roll is a function of the relative electrical potential of the scavenger roll to the electrical charge on the toner. As the electrical potential on the scavenger roll is increased, the effectiveness and hence, the life of the cleaning station is extended. That is, less of the toner is kept by the filter assembly, thereby prolonging the effectiveness of the filter assembly. Once the filter becomes clogged, then the cleaning station fills up with toner requiring manual intervention.

When increasing the potential on the scavenger roll, electrical arcing may occur from the roll to the housing. Such arcing causes electromagnetic interference and can cause fires in the cleaning station. If the arcing is to be controlled by lowering of scavenger roll voltage, then the effectiveness of the cleaning s...