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Magnetic Brush Sleeve with Smooth Ferromagnetic Surface

IP.com Disclosure Number: IPCOM000076695D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hoekzema, RJ: AUTHOR

Abstract

In a copier, a magnetic brush is useful for transporting ferromagnetic developer mix by establishing a magnetic field and by the application of a continuous bias in the development zone, as well as for cleaning residual toner from the photoconductor after transfer.

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Magnetic Brush Sleeve with Smooth Ferromagnetic Surface

In a copier, a magnetic brush is useful for transporting ferromagnetic developer mix by establishing a magnetic field and by the application of a continuous bias in the development zone, as well as for cleaning residual toner from the photoconductor after transfer.

The magnetic brush, Fig. 1, consists of an iron core 1, magnets 2, and a nonmagnetic cylinder 3 surrounding the core and magnets. The non magnetic cylinder is specially treated on its outside diameter and rotates about the magnets and core, carrying the developer mix through the development zone. Usually a roughened material is partially ferromagnetic.

In the present case, a continuous ferromagnetic sheet 4 is wrapped about a cylindrical member 5, Fig. 2. Sheet 4 is continuous, ferromagnetic, and smooth both prior to and after application although it is not necessary to maintain a particular degree of smoothness. Cylinder 5 os of a nonmagnetic material and is also smooth both prior to and after application of the sheet.

Sheet 4 (outer sleeve), which is applied to the cylindrical member 5, is preferably thick enough to act as a magnet when placed in the fields of the internal magnets. It also must be thin enough not to shunt the total field presented to it by the internal magnets.

As an example, a smooth spring steel sheet, 0.002 inch thick is wrapped around an aluminum cylinder, 2.5 inches in diameter. This cylindrical member 5 is placed around th...