CLEANING BLADE END SEALS
Original Publication Date: 1988-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In a printing machine using a liquid developer material, a cleaning blade located in a position between 270" and 90" around the photoconductive drum requires extra design considerations to prevent leakage of the developer material. Radial seals prevent leakage from the extreme in board and out board ends of the housing. However, where the radial seal meets the cleaning blade, leakage usually occurs. Two seal embodiments are described hereinafter one embodiment is for an independent blade and seal, the other embodiment is for a blade having a radial seal incorporated therein. Both embodiments use the principle of creating a seal at the blade tip based upon the intended blade orientation and loads. Liquid developer material is allowed to pool at the tip providing for natural or forced flow evacuation of the tip area. In the integral blade and seal, the seal, at the ends, extends over the tip of the blade and has an aperture therein for collecting the liquid developer material. The blade and seal are made from a resilient material. In the independent blade and seal, the resilient seal is mounted on the blade and extends over the tip thereof at opposed ends. The seal has an aperture therein in the region thereof contacting the photoreceptor to pool the liquid developer material. Thus, the seal forms a dam at the ends of the blade to minimize leakage thereat.