Photocopying – Contact printing – Light boxes
Patent
1994-06-08
1995-05-16
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118657, 355247, 355251, G03G 1509
Patent
active
054165660
ABSTRACT:
A development apparatus includes a housing defining a chamber holding a supply of two-component developer material consisting of toner, and magnetizable carrier beads. The development apparatus also includes an extended life, increased reliability magnetic roll assembly within the housing for repeatably transporting a desired quantity of attracted developer material, fed from the chamber, for movement through the development zone. The improved magnetic roll assembly includes a rotatable non-conductive shell or substrate surrounding a magnetic member so as to prevent the creation of eddy currents in the substrate during its rotation. The substrate has an elastomeric coating layer formed over it. The elastomeric coating layer has a mechanically deformable smooth surface for effectively holding, even at relatively high rates of speed, the quantity of attracted developer material thereon being transported. The smooth surface is deformable by magnetized carrier beads acting under the influence of the magnetic member.
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Makhijani, Suresh P., "Textured Magnetic Brush Roll", Xerox Disclosure Journal, vol. 4, No. 3, May/Jun. 1979, p. 303.
Hewitt, R. E., "Etched Developer Roll", Xerox Disclosure Journal, vol. 4, No. 4, Jul./Aug. 1979, p. 447.
Alvarez Jorge A.
DeYoung Victoria F.
Edmunds Cyril G.
Brase Sandra L.
Grimley A. T.
Nguti Tallam I.
Xerox Corporation
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