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HIGH FREQUENCY VIBRATORY ENHANCED CLEANING IN ELECTROSTATIC IMAGING DEVICES

IP.com Disclosure Number: IPCOM000026319D
Original Publication Date: 1991-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 118K

Publishing Venue

Xerox Disclosure Journal

Abstract

Numerous cleaning methods have been proposed to accomplish effective toner release from the imaging surface, including blades supported in doctoring or wiping modes, rotating or sweeping neutral or electrically-biased fiber brushes, magnetic brushes, vacuum systems and various combinations thereof. However, toner components and debris are tightly adhered to the surface by electrostatic and mechanical forces, and tend to resist release. Accordingly, particularly when the shape of a particle is not optimum, e.g. a flat toner particle, prior cleaning methods do not achieve optimum cleaning operation. Additionally, it has been noted that even when pre-clean charging, the charge at the toner and photoreceptor surface interface is not neutralized to the extent desirable for subsequent toner release. This problem is believed to arise from the failure of neutralizing ions from the pre-clean charging device to reach all the charged areas on the toner and photoreceptor. Even when precleaning illumination is provided, to dissipate charge on the surface, by flooding the back side of a translucent photoreceptor, tightly bound charge remains at the particleiimaging surface interface.

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XEROX DISCLOSURE JOURNAL

HIGH FREQUENCY VIBRATORY Proposed Classification ENHANCED CLEANING IN U.S. C1.355/296 ELECTROSTATIC IMAGING
DEVICES
Nero R. Lindblad
Robert J. Meyer

Int. C1. G03g 21/00

Numerous cleaning methods have been proposed to accomplish effective toner release from the imaging surface, including blades supported in doctoring or wiping modes, rotating or sweeping neutral or electrically- biased fiber brushes, magnetic brushes, vacuum systems and various combinations thereof. However, toner components and debris are tightly adhered to the surface by electrostatic and mechanical forces, and tend to resist release. Accordingly, particularly when the shape of a particle is not optimum, e.g. a flat toner particle, prior cleaning methods do not achieve optimum cleaning operation. Additionally, it has been noted that even when pre-clean charging, the charge at the toner and photoreceptor surface interface is not neutralized to the extent desirable for subsequent toner release. This problem is believed to arise from the failure of neutralizing ions from the pre-clean charging device to reach all the charged areas on the toner and photoreceptor. Even when precleaning illumination is provided, to dissipate charge on the surface, by flooding the back side of a translucent photoreceptor, tightly bound charge remains at the particleiimaging surface interface.

To overcome these problems, a piezoelectric transducer (PZT) device operating at a relatively high frequency is coupled to the backside of an imaging surface to cause localized vibration at a predetermined amplitude, and is positioned in association with a pre-clean electrostatic discharging or charging device associated with the imaging surface cleaning function, whereby residual toner is fluidized at the discharge station for enhanced electrostatic discharge of the toner and imaging surface, and release from the electrical and mechanical forces adhering the toner to the imaging surface.

A PZT device as described...