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Triboelectric Toner Precipitator

IP.com Disclosure Number: IPCOM000082013D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Simpson, HW: AUTHOR [+2]

Abstract

A triboelectrically charged toner precipitator roll is employed in a cleaning station of an electrophotographic copier, to recover toner cleaned from the surface of a photoconductive drum. The utilization of triboelectric charging eliminates the necessity of high-voltage power supplies in the cleaning station.

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Triboelectric Toner Precipitator

A triboelectrically charged toner precipitator roll is employed in a cleaning station of an electrophotographic copier, to recover toner cleaned from the surface of a photoconductive drum. The utilization of triboelectric charging eliminates the necessity of high-voltage power supplies in the cleaning station.

Toner 11 is removed from drum 13 by rotating brush 15. The toner is dislodged from the brush 15 by knock-off bar 17 and pumped by the action of the brush past precipitator roll 19. The toner 11 is scraped from the roll 19 by scraper blade 21 and deposited adjacent the rotating auger 23, which removes the toner from the cleaning station. Air containing a substantially reduced amount of toner is passed through filter 25 prior to exhausting into the machine ambience.

The precipitator roll 19 comprises a steel tube which is electrically isolated from the remainder of the cleaning station and which is coated with TEFLON* (PTFE). The scraper blade 21 comprises a thin steel strip which is grounded to the machine frame and which is coated with a nylon film. The action of the nylon coated blade 21 rubbing against the TEFLON coated roll 19 creates triboelectric charging of the roll, to a polarity which attracts positively charged toner particles thereto. Various other coating materials located at opposite ends of the triboelectric series can be employed to triboelectrically attract the toner particles to the precipitator roll 19. * Tr...