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CLEANING BLADE - STIFF IN OPERATION-LIMP IN NON-USE

IP.com Disclosure Number: IPCOM000024280D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 86K

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 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 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. This allows toner to get on the backside of the blade causing contamination and cleaning failures.

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KEROX . DISCLOSURE JOURNAL

CLEANING BLADE - STIFF IN OPERATION- LIMP IN NON-USE
John Bernhard

Proposed Classification
U.S. C1. 355/15

Int. C1. G03g 21/00

FIG. 2

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 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 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. This allows toner to get on the backside of the blade causing contamination and cleaning failures.

Figures 1 and 2 describe a blade cleaner which eliminates retraction by allowing the blade to remain in continuous contact with the drum. During non-cleaning, the system prevents cold flow by increasing the blade-free length which reduces the blade-to-drum normal force.

Volume 5 Number 1 January/February 1980 103

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

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CLEANING BLADE - STIFF IN OPERATION - LIMP IN NON-USE (Con t'd)

Figure 1 shows the blade 1 in the cleaning mode i...