Browse Prior Art Database

A DEVELOPMENT SYSTEM Disclosure Number: IPCOM000024556D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


As shown in the figure, development system 20 includes a hopper 52 stirring a supply of particles 54 therein. Particles 54 descend through aperture 56 and hopper 52 onto the surface of the developer roller, indicated generally by the reference numeral 58. Developer roller 58 includes an elongated, cylindrical magnetic member 60 mounted interiorly of tubular member 62. Tubular member 62 remains substantially stationary with magnetic member 60 rotating in the direction of arrow 64. An electrically conductive fabric member 66 is secured to tubular member 62. Preferably, fabric member 66 is cemented to tubular member 62 in the region of development zone 70. A multiplicity of tufts 68 extend in an outwardly direction from fabric 66. Each tuft 68 is woven through fabric 66 and comprises a multiplicity of fibers. Tufts 68 are closely adjacent to the photoconducitve surface of the drum in development zone 70. Particles 56, which are insulative, adhere to the tips of the tufts to prevent discharge. A voltage source (not shown) electrically biases the fabric 66 to a suitable magnitude and polarity to suppress background development. Each fiber of tuft 68 is made from electrically conductive magnetic stainless steel. Tubular member 62 is made from a non-magnetic material such as aluminum. Magnet 60 is preferably made from barrium ferrite having a magnetic field impressed thereon. Metering blade 72 defines a gap between tubular member 62 and the free end regions thereof. This gap regulates the quantity of particles being transported into contact with the electrostatic latent image recorded on the photoconductive surface. Preferably,