A CROSSMIXING SYSTEM
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
In an electrophotographic printing machine, the development system employs a developer roller 58. As shown in the figure, developer roller 58 includes a mixing device mounted interiorly thereof. A plurality of discs 72 are fastened to shaft 74. Bars 76 are supported by discs 72. Permanent magnetic strips 78 are secured to bars 76. Bars 76 are substantially equally spaced from one another defining spaces 80 therebetween. Preferably, bars 76 are made from a soft magnetic iron which provides sufficient stiffness and support to hold permanent magnetic strips 78 thereto. Spaces 80 permit the developed material to pass into the interior of developer roller 58. In the interior of developer roller 58, a mxing device indicated generally by the reference numeral 82 thoroughly mixes the toner particles with the carrier granules. Motor 84 is coupled to shaft 74 to rotate both mixing device 82 and developer roller 58 in unison with one another in the direction of arrow 60. Voltage source 86 is coupled to shaft 74. Inasmuch as discs 72 and bars 76 are electrically conductive, voltage source 86 electrically biases developer roller 58 to a suitable potential and magnitude. Mixing device 82 includes a plurality of spaced apart conically-shaped members 88. Conically-shaped members 88 are half right circular cones, preferably being funnels. One set of funnel-shaped members has the apex of the cone pointing in one direction while the other set of funnel-shaped members has the apex of the cone pointing in the opposite direction along shaft 74. In this way, there are two rows of half cones or funnel-shaped members with all of the half cones in the same row or set pointing in the same direction and with the half cones in the other row set pointing in the opposite direction. This arrangement is particularly effective since it enables the conical members to be closely spaced by achieving full coverage of the interior of developer roller 58.