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CLEANING BLADE - OSCILLATING COUNTERWEIGHT

IP.com Disclosure Number: IPCOM000024329D
Original Publication Date: 1980-Apr-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

One way of cleaning a reusable electrostatographic drum is with the use of a cleaning blade which is maintained in pressure contact with the drum. When the machine is turned off and if the blade remains in contact against the drum for prolonged periods of time, cold flow of the drum surface may be witnessed causing a linear depression on the drum surface. This depression gets filled with toner which cannot be cleaned and eventually causes a line to appear on the output copy. To prevent cold flow, the blade is retracted away from contact with the drum during idle periods. A disadvantage with a retraction system, however, is that when the blade re-engages the drum, it falls back into a pile of toner left at the blade-drum interface on the previous retraction cycle. This allows toner to get on the backside of the blade causing contamination and cleaning failures.

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(EROX DISCLOSURE JOURNAL

CLEANING BLADE - OSCILLATING COUNTERWEIGHT U.S. C1. 355/15 John Bernhard

Proposed Classification

Int. C1. G03g 21/00

One way of cleaning a reusable electrostatographic drum is with the use of a cleaning blade which is maintained in pressure contact with the drum. When the machine is turned off and if the blade remains in contact against the drum for prolonged periods of time, cold flow of the drum surface may be witnessed causing a linear depression on the drum surface. This depression gets filled with toner which cannot be cleaned and eventually causes a line to appear on the output copy. To prevent cold flow, the blade is retracted away from contact with the drum during idle periods. A disadvantage with a retraction system, however, is that when the blade re-engages the drum, it falls back into a pile of toner left at the blade-drum interface on the previous retraction cycle. This allows toner to get on the backside of the blade causing contamination and cleaning failures.

The figure illustrates a system which eliminates retraction by allowing the blade to remain in continuous contact with the drum. Cold flow is prevented by reducing the blade to drum normal force during periods when the drum is not rotating.

Volume 5 Number 2 March/April 1980 20 1

[This page contains 1 picture or other non-text object]

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CLEANING BLADE - OSCILLATING COUNTERWEIGHT (Cont'd)

The blade 1 is fixed to blade holder 2 which is fixedly attached to sup...