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Three-Stage Bead Scavenger

IP.com Disclosure Number: IPCOM000038739D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Chang, P: AUTHOR [+2]

Abstract

In an electro photographic process utilizing a two-component developer, migration of carrier beads out of the developer station due to mechanical and/or electrostatic action creates undesirable machine contamination and/or copy quality defects. A simple, low-cost, self-cleaning scavenger device is described which overcomes some of the disadvantages of a scavenger magnetic roll and/or a fixed scavenger magnetic bar. The device (Fig. 1A,B,C) consists of an assembly 10 which, in the rest position of Fig. 1A, is placed in close juxtaposition to the surface of photoconductor (PC) 11 which carries undesirable carrier beads (Image Omitted) 13.

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Three-Stage Bead Scavenger

In an electro photographic process utilizing a two-component developer, migration of carrier beads out of the developer station due to mechanical and/or electrostatic action creates undesirable machine contamination and/or copy quality defects. A simple, low-cost, self-cleaning scavenger device is described which overcomes some of the disadvantages of a scavenger magnetic roll and/or a fixed scavenger magnetic bar. The device (Fig. 1A,B,C) consists of an assembly 10 which, in the rest position of Fig. 1A, is placed in close juxtaposition to the surface of photoconductor (PC) 11 which carries undesirable carrier beads

(Image Omitted)

13. Assembly 10, shown in cross section, extends along the width of the PC surface and is attached to the body of the copier/printer along slideways (not illustrated), which allow movement of assembly 10 away from the PC surface 11. Assembly 10 consists of plate 14 made from a non-magnetic material attached to at least two sets of posts 15 on each end of plate 14. Attached to posts 15 are slides 16 capable of motion along posts 15 independent of plate 14. Slides 16 hold a fixed permanent magnet 17. In operation, during the collection stage (Fig. 1A), undesirable beads 13 are removed from the PC, and are attracted to and are held on plate 14 by the field of magnet 17. Slides 16 are in the rest position against plate 14 through the action of springs 18. At some point in machine use, as determined by machine ch...