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IP.com Disclosure Number: IPCOM000024618D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


In an electrophotographic printing machine, a magnetic brush development system is frequently employed. The magnetic brush development system utilizes a rotating, non-magnetic tubular member having a magnetic member disposed interiorly thereof. It has been found that streaking of the developed electrostatic latent image may occur. To prevent the occurrence of streaking, the magnet has the pole pattern arranged thereon in a double spiral. This double spiral arrange-ment appears to uniformly charge the toner inductively for subsequent develop-ment and eliminates any mechanical flow blockages during the transporting of the toner particles. It is believed that the double helix design minimizes solid area streaks.