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Browse Prior Art Database

AIR PRESSURE SEAL FOR CLEANER IN COPIERS

IP.com Disclosure Number: IPCOM000025270D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 62K

Publishing Venue

Xerox Disclosure Journal

Abstract

In electrostatographic reproducing devices using dry toner as the marking material toner emissions from the developer and cleaning stations can cause significant contamination to other operational parts of the machine. For example, contami-nation of the optics, corotrons, power supplies, can ultimately produce defects in copy quality and in fact, cause machine breakdown. Furthermore, in some configurations an anti-air current may cause a negative pressure in an assembly thereby permitting toner to be drawn out through the air space in the seal causing contamination to the corotrons, fuser and transport systems resulting in copy quality defects and ultimately paper jams. The figure illustrates the use of an air seal with positive pressure in, for example, a cleaner housing 10 to drive the toner

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In electrostatographic reproducing devices using dry toner as the marking material toner emissions from the developer and cleaning stations can cause significant contamination to other operational parts of the machine. For example, contami- nation of the optics, corotrons, power supplies, can ultimately produce defects in copy quality and in fact, cause machine breakdown. Furthermore, in some configurations an anti-air current may cause a negative pressure in an assembly thereby permitting toner to be drawn out through the air space in the seal causing contamination to the corotrons, fuser and transport systems resulting in copy quality defects and ultimately paper jams. The figure illustrates the use of an air seal with positive pressure in, for example, a cleaner housing 10 to drive the toner

161 Volume 9 Number 2 March/April 1984

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AIR PRESSURE SEAL FOR CLEANER IN COPIERS (Cont'd)

back into the cleaner housing. Air is created from a source through a nozzle 12 within the cleaner housing extrusion and the air is directed upward to the seal gap at a pressure sufficient to overcome any other negative pressure sources in the machine. This ensures that the toner falling from the blade 14 in the cleaner housing, for example, into the gap will be carried back out of the gap into the cleaner by the positive pressure generated by the air flow from the nozzle 12. This type of seal has the advantage in that...