Browse Prior Art Database

Lower Seal for Cascade Developers in Electrophotographic Systems

IP.com Disclosure Number: IPCOM000077185D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Hausle, WC: AUTHOR [+2]

Abstract

A cascade developer which operates to develop an image on the photoconductor surface of an electrophotographic system is shown.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 98% of the total text.

Page 1 of 2

Lower Seal for Cascade Developers in Electrophotographic Systems

A cascade developer which operates to develop an image on the photoconductor surface of an electrophotographic system is shown.

The developer flows in a downward direction to develop as the image moves in an upward direction. The developer comprises carrier beads which produce a triboelectric charge relative to the toner particles, so that the toner particles are transported to the photoconductor surface 10 for developing the image. In cases where the carrier beads become thoroughly depleted of toner, there is a tendency for the carrier beads to stick to the photoconductor surface. The opposing force of the descending developer mass may cause the depleted beads to travel in sliding contact with the photoconductor surface toward the bottom seal area. To prevent the ejection of the beads through the gap between the bottom of the developer housing 12 and the photoconductor surface 10, a thin flexible dielectric material 14 is provided to produce a seal to prevent the carrier beads from being forced from the developer unit. The seal member is mounted so that the edge is substantially tangent to the drum surface and the thickness is less than the diameter of the carrier beads, so that the carrier beads will be positively diverted from the photoconductor surface. The force normal to the drum is very low so that minimal wear is produced on the photoconductor surface.

1

Page 2 of 2

2

[This page contains 1 p...