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AUXILIARY NEGATIVE GAGE PRESSURE DEVICE

IP.com Disclosure Number: IPCOM000024522D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 1 page(s) / 53K

Publishing Venue

Xerox Disclosure Journal

Abstract

Toner contamination of electrostatographic reproducing apparatus outside the developer housing can be reduced by lowering the pressure within the developer housing thereby reducing the amount of toner which escapes from the developer housing. The figure illustrates a device which applys the Venturi effect to air flow in a free field to achieve lower pressure. In the device, a funnel-shaped conduit 10 is inserted in the much larger fuser exhaust duct 12, for example, one which has a constant fluid flow within it. The funnel-shaped conduit necks down to a much smaller diameter tube 14 resulting in greatly increased air velocity at this point thereby creating a high pressure drop. At this point the tube 14 is connected by conduit 16 to developer housing 18 thereby reducing the pressure within the developer housing and the resulting machine contamination due to toner escaping from the developer housing.

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XEROX DISCLOSURE JOURNAL

AUXILIARY NEGATIVE GAGE PRESSURE DEVICE U.S. C1. 355/3DD Mark F. Hurwitz

Proposed Classification

Int. C1. G03g 15/00

Toner contamination of electrostatographic reproducing apparatus outside the developer housing can be reduced by lowering the pressure within the developer housing thereby reducing the amount of toner which escapes from the developer housing. The figure illustrates a device which applys the Venturi effect to air flow in a free field to achieve lower pressure. In the device, a funnel-shaped conduit 10 is inserted in the much larger fuser exhaust duct 12, for example, one which has a constant fluid flow within it. The funnel-shaped conduit necks down to a much smaller diameter tube 14 resulting in greatly increased air velocity at this point thereby creating a high pressure drop. At this point the tube 14 is connected by conduit 16 to developer housing 18 thereby reducing the pressure within the developer housing and the resulting machine contamination due to toner escaping from the developer housing.

Volume 5 Number 4 July/August 1980 425

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