Browse Prior Art Database

METHOD TO CONTROL HOUSING AIR INLET GAP

IP.com Disclosure Number: IPCOM000026692D
Original Publication Date: 1993-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 250K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method and apparatus for improving cleaning efficiency of air current cleaners used for cleaning a charge retentive surface of a moving photoreceptor is disclosed. Air inlet gaps between a cleaner housing and a photoreceptor surface can be controlled firstly, by sealing the housing/photoreceptor gap with a film seal and secondly by forming a controlled air gap with an air inlet baffle mounted to the outside surface of the cleaner housing. This eliminates many high tolerance requirements and allows the use of intentionally non-uniform air gaps if desired. This improvement is particularly applicable to cleaner housings and will avoid stringent manufacturer's settings and reduce part and assembly costs.

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XEROX DISCLOSURE JOURNAL

METHOD TO CONTROL HOUSING AIR INLET GAP
Bruce E. Thayer

Proposed Classification

U.S. Cl. 355/296 Int. C1. G03g 21/00

FIG. I

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWAprill993 175

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METHOD TO CONTROL HOUSING AIR INLET GAP (Cont'd)

17 FIG. 3

50

5 FIG. 36 \

1

FIG. 6 40a

36 \

I I

176 XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWApril 1993

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METHOD TO CONTROL HOUSING AIR INLET GAP (Cont'd)

A method and apparatus for improving cleaning efficiency of air current cleaners used for cleaning a charge retentive surface of a moving photoreceptor is disclosed. Air inlet gaps between a cleaner housing and a photoreceptor surface can be controlled firstly, by sealing the housing/photoreceptor gap with a film seal and secondly by forming a controlled air gap with an air inlet baffle mounted to the outside surface of the cleaner housing. This eliminates many high tolerance requirements and allows the use of intentionally non-uniform air gaps if desired. This improvement is particularly applicable to cleaner housings and will avoid stringent manufacturer's settings and reduce part and assembly costs.

Figure 1 shows cleaner housing 30, with electrostatic brush (ESB) cleaner 10, which has upstream and downstream air inlets 5, 7 that must balance the air flows from the two sides of the housing 30. Air balance is maintained by controlling the spacing between cleaner housing 30 and photoreceptor 26. Also, the spacing generally indicated at 18, is controlled between the brush 13 and the cleaner housing inner wall 31 and/or adding interferences 24 between the brush 13 and the cleaner housing inner wall 31 near the downstream air inlet 7 to create a pressure situation which will affect the air flow (air flow direction indicated at arrow 12). All of the above mentioned air flow control methods are effective to some degree. However, each requires extremely close tolerances to maintain the spacings and interferences, which are essential for the methods to function as desired. Additionally, there are a large number of parts which must be taken into account to determine the total tolerance stack- up for the spacings and interferences. Some parts, such as the electrostatic brush 13, cannot be held to very tight tolerances and have poor environmental and age stability. Other parts, such as the cleaner housing assembly 30, can be manufactured to a moderate tolerance but because other portions of the assembly must be held to critical locations, the tolerance at the air inlets 5,7 is sacrificed for the competing functions. This type of problem can occur in many types of cleaner housings situated against a photoreceptor 26 with active or passive air flow used to control toner or other effluent emissions. Toner emissions have been controlled in some prior art blade cleaner housings, shown generally...