Browse Prior Art Database

Magnetic Brush Developer Edge Effect Magnets

IP.com Disclosure Number: IPCOM000087286D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Bellamy, RL: AUTHOR [+3]

Abstract

In the magnetic brush developer of Fig. 1, the space constraints of the xerographic copier are such that the axial length of magnetic brush roll 22 is only slightly longer than the axial length of photoconductor 11 (see Fig. 2). This developer is more completely described in U. S. Patent 3,863,603.

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Magnetic Brush Developer Edge Effect Magnets

In the magnetic brush developer of Fig. 1, the space constraints of the xerographic copier are such that the axial length of magnetic brush roll 22 is only slightly longer than the axial length of photoconductor 11 (see Fig. 2). This developer is more completely described in U. S. Patent 3,863,603.

A possible effect of these length constraints is that the magnetic flux density may roll off, as shown at 50 in Fig. 3.

The effect of this roll-off can be eliminated by two edge-effect magnets 28, positioned at opposite ends of brush roll 22, as shown in Fig. 2. As a result of these two magnets, the flux density at the roll ends is increased to that shown by dotted lines 51 in Fig. 3.

Fig. 4 shows the circumferential positioning of magnets 28 relative to magnets 25, 26 and 27, as well as to the brush roll/photoconductor development nip 29. Fig. 4 also shows the magnet polarities.

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