Browse Prior Art Database

Magnetic Brush Developer

IP.com Disclosure Number: IPCOM000088478D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Buckley, LW: AUTHOR [+4]

Abstract

The surface of magnetic brush roll 10 must be accurately positioned relative to photoconductor drum 11. Thus, the method of manufacturing roll 10 must result in no eccentricity. In addition, the surface of roll 10 is preferably both rough and resilient so as to produce a mix-carrying surface, and minimum abrasive force against the photoconductor, as the photoconductor is "brushed" with the developer mix.

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Magnetic Brush Developer

The surface of magnetic brush roll 10 must be accurately positioned relative to photoconductor drum 11. Thus, the method of manufacturing roll 10 must result in no eccentricity. In addition, the surface of roll 10 is preferably both rough and resilient so as to produce a mix-carrying surface, and minimum abrasive force against the photoconductor, as the photoconductor is "brushed" with the developer mix.

With reference to Fig. 2, roll 10 comprises a nonmagnetic, electrically conductive metal cylinder 12 into which axially extending teeth have been extruded or machined. The tooth profile comprises teeth which are from .025 to
.045 inch high, and of between 100 to 150 teeth per inch of the roll's circumference. As seen in Fig. 2, the tooth cross section is not symmetrical. Specifically, the teeth slope more steeply on the side which advances toward the photoconductor, and less steeply on the opposite side. This configuration increases the roll's mix-carrying capability.

The metal cylinder is coated with a uniform coating 13 of resilient polymeric, electrically conductive material from .008 to .012 inch thick. To insure uniform thickness, and thus maintain the roll concentric, this material is sprayed onto the surface of cylinder 12. More specifically, the roll is supported with its axis horizontal; the roll is rotated at a relatively high RPM; and a spray gun traverses the roll axially as multiple thin layers are placed on the roll's exteri...