Browse Prior Art Database

Air Dam in a Magnetic Brush Developer

IP.com Disclosure Number: IPCOM000041104D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chang, P: AUTHOR [+2]

Abstract

In a xerographic reproductive device, an air dam is provided in an uphill magnetic brush developer to present toner and/or carrier beads from being carried out of the developer housing.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 87% of the total text.

Page 1 of 1

Air Dam in a Magnetic Brush Developer

In a xerographic reproductive device, an air dam is provided in an uphill magnetic brush developer to present toner and/or carrier beads from being carried out of the developer housing.

Photoconductor 10 of the reproduction device moves in an upward direction as shown by arrow 11. A magnetic brush roller 12 is rotated clockwise about its axis 13, and the photoconductor's latent image is developed by toner (not shown).

Photoconductor 10 and roller 12 are about 16 inches wide (i.e., the dimension perpendicular to the figure). If the developer is a multi-roller developer, roller 12 is the last of a number of rollers to engage photoconductor
10.

A rod-like air dam member 14 is located within the developer to prevent toner and/or carrier from being carried to the exit area 15 of the developer.

The air dynamics between the moving surface of photoconductor 10 and the complementary curved stationary portion 16 of the air dam, causes a high pressure zone to be created in area 17. The length of surface 16 (measured in the direction of photoconductor movement) is relatively long, and surface 16 is spaced about 0.025 inch from the adjacent photoconductor. As a result, dam member 14 can be located at a predetermined position in the developer, and fine adjustment mechanism is not required.

The relatively wider spacing of stationary surface 18 from the moving surface of roller 12 causes area 19 to be a low pressure zone.

As a result of the...