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Magnetic Brush Developer

IP.com Disclosure Number: IPCOM000092673D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Cross, RG: AUTHOR [+3]

Abstract

Magnetic brush development of electrostatic images provides continuous tone development of the image. However it is difficult to arrange a device which provides a soft uniform magnetic brush and maintain the initial iron-toner mix. This device achieves these requirements by employing a magnetic mixing brush in conjunction with the magnetic developing brush. There is coaction with a holding plate and mixing disks to impart transfer mixing of the iron and toner. Thus, a soft brush is constantly being reformed on the magnetic developing drum and the iron-toner mix is continuously maintained.

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Magnetic Brush Developer

Magnetic brush development of electrostatic images provides continuous tone development of the image. However it is difficult to arrange a device which provides a soft uniform magnetic brush and maintain the initial iron-toner mix. This device achieves these requirements by employing a magnetic mixing brush in conjunction with the magnetic developing brush. There is coaction with a holding plate and mixing disks to impart transfer mixing of the iron and toner. Thus, a soft brush is constantly being reformed on the magnetic developing drum and the iron-toner mix is continuously maintained.

Developing drum 1, having stationary magnets 2 spaced around inside its periphery except for one area 3, rotates in the direction of arrow 4. Such movement is opposite to the direction of the paper shown by arrow 5. A second smaller mixing drum 6 is rotatably mounted adjacent drum 1 on its side opposite the passage of paper. Drum 6 rotates in the same direction as drum 1. Stationary magnets 7 are also spaced around inside the drum 6 periphery except for one blank area 8 opposite area 3 of drum 1. Out of the magnetic field area, a plurality of mixing disks 9 is positioned above drum 6 and substantially closer to drum 1. Toner 10 is continuously dropped from toner feedbox 11. Some of toner 10 is deposited on disks 9 and the remainder is directly deposited on mixing brush 14. Holding plate 12, disposed beneath disks 9 and between drum 6 and drum 1, serves t...