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Hybrid Scavengeless Development Wire Rotation

IP.com Disclosure Number: IPCOM000172172D
Publication Date: 2008-Jul-01
Document File: 2 page(s) / 495K

Publishing Venue

The IP.com Prior Art Database

Abstract

This idea proposes a method to reduce or eliminate wire contamination in an electrophotographic printer that uses the hybrid scavengeless development (HSD) process. Wire contamination can result in image quality defects. The idea is to rotate the wires, reducing wire pollution resulting in improvements to image quality metrics such as mottle and streaks. Rotation has been shown to be beneficial for development and reduction of wire pollution. This publication describes two methods to implement wire rotation. In this example there are 4 HSD wires.

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Hybrid Scavengeless Development Wire Rotation

This idea proposes a method to reduce or eliminate wire contamination in

an electrophotographic printer that uses the hybrid scavengeless development (HSD) process.  Wire contamination can result in image quality defects.  The idea is to rotate the wires, reducing wire pollution resulting in improvements to image quality metrics such as mottle and streaks. Rotation has been shown to be beneficial for development and reduction of wire pollution.  This publication describes two methods to implement wire rotation.  In this example there are 4 HSD wires.

Method #1

The wire rotation concept here is termed grip and rotate. The 4 HSD wires are collectively bundled and gripped, and as a unit rotated. The wires pass through channels to prevent them from translating or folding over one another in the image zone. Though many forms of actuation are possible, the approach described here interfaces a gear soldered to the wire collection with a rack mounted on the photoreceptor module backer bar. Two stepper motors (inboard and outboard) are situated in the spacious region within the photoreceptor module and drive the racks producing a rotation of ±180° or more depending on cyclic fatigue constraints.

Method #2

The 4 HSD wires are clamped between two racks. The racks are moved axially with respect to each...