Browse Prior Art Database

HIGH SPEED ROS, NEGATIVE PRESSURE DEVICE

IP.com Disclosure Number: IPCOM000026632D
Original Publication Date: 1993-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 80K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the drawing Figure, the polygon 2 of a raster output scanner rotates at a very high RPM, i.e., 22,000 RPM. At that speed, the polygon acts as a blower impeller causing a negative pressure to form in the polygon housing 1 and around the polygon. Air is drawn through the support bearings 4, 5 and through the wire opening 6 into the housing 1. During polygon operation, the bearing grease may become atomized and when this occurs, the aforedescribed air flow created by the high speed rotation of polygon 2 can ease out through the laser beam opening in the housing and onto

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XEROX DISCLOSURE JOURNAL

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HIGH SPEED ROS, NEGATIVE PRESSURE DEVICE U.S. C1.33/482 Edward P. deJong
Paula Siviy 7/033, B43L 13/00

Proposed Classification

Int. C1. B43L 7/00, B43L

F

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XEROX DISCLOSURE JOURNAL - Vol. 18, Yo. 1 .January/February 1993 1

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HIGH SPEED ROS, NEGATIVE PRESSURE DEVICE(Cont'd)

Referring to the drawing Figure, the polygon 2 of a raster output scanner rotates at a very high RPM, i.e., 22,000 RPM. At that speed, the polygon acts as a blower impeller causing a negative pressure to form in the polygon housing 1 and around the polygon. Air is drawn through the support bearings 4, 5 and through the wire opening 6 into the housing 1. During polygon operation, the bearing grease may become atomized and when this occurs, the aforedescribed air flow created by the high speed rotation of polygon 2 can ease out through the laser beam opening in the housing and onto

  Additionally, r the scanner optical system. as the air borne grease passes by polygon 2, it may deposit on and coat the polygon facets 8.

To obviate this problem, a controlled negative pressure is established in housing 1 to balance and limit interior air flow. To do this, bearings 4, 5 are sealed and wire opening 6 closed. A vacuum hose 10, which is coupled to a suitable vacuum source (i-e., a standby fan or system compressor) is introduced into the housing 1. Hou...