Electrophotography – Having particular structure – Remanufacturing
Patent
1997-03-27
1998-07-14
Ramirez, Nestor R.
Electrophotography
Having particular structure
Remanufacturing
399276, G03G 1508
Patent
active
057818304
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the field of xerography or electrophotography, and to the use of a magnetic brush developer roller to deposit toner on the electrostatic latent image that is carried by a movable member, such as a photoconductor or photoreceptor, that travels on a path adjacent to the rotating development roller(s) of a magnetic brush developer apparatus. More specifically, this invention provides an electroless plated nickel/phosphor (Ni/P) layer on the external and the internal cylindrical surfaces of hollow, electrically conductive metal or electroless plateable plastic, and nonmagnetic magnetic brush roller(s).
2. Description of the Related Art
A wide variety of magnetic brush developer apparatus are known in the xerographic art, including developer apparatus having one or more rotating rollers that carry a single-component toner or a two-component toner to the development nip that is formed by the roller(s), and an electrostatic latent image that is carried by a closely adjacent and moving photoreceptor, such as a belt photoconductor or a drum photoconductor. Both contact toner development and jumping toner development of the latent image are known. It is also known that the photoconductor and development roller may rotate in the same direction within the development nip, or they may rotate in opposite directions within the development nip.
The following United States patents are of general interest relative to magnetic brush developer apparatus. U.S. Pat. No. 4,517,274 relates to a method for developing electrostatic latent images wherein a magnet is contained within a rotating delivering sleeve that carries developing particles thereon. U.S. Pat. No. 4,876,574 describes a developing apparatus having a developing sleeve that is made of aluminum. U.S. Pat. No. 5,052,335 describes a developing device having an endless toner support member that is loosely fitted over the outer periphery of an electrically conductive drive roller. The drive roller is formed of aluminum, stainless steel, or is formed by winding electrically conductive material such as nitrile rubber, silicone rubber, styrene rubber or butadiene rubber around the periphery of a metal roller. The tubular shaped and loosely-fitting member that supports the toner is formed of a soft resinous sheet that is made of polycarbonate, nylon or fluoroplastic, or a sheet of such a resin mixed with carbon, metallic powder, or a thin film that is made of nickel, stainless steel or aluminum, or a laminated sheet of the resinous sheet and the metallic thin film. U.S. Pat. No. 5,149,914 in which a development member is covered by a tubular shaped membrane member, the membrane member being driven by the drive roller through frictional engagement therewith. The membrane member may be formed of natural rubber, silicone rubber, urethane rubber, butadiene rubber, chloroprene rubber or NBR. The use of a membrane member formed of a metal foil such as phosphor bronze, stainless steel or nickel, or formed of a resin membrane material, such as nylon, polyamide or polyethylene terephthalate is suggested. The use of a conductive layer containing a conductive metal such as Al or Ni is suggested.
Other publications of general interest include U.S. Pat. No. 5,027,745 whose development roller has a surface containing carbon fibers, U.S. Pat. No. 5,202,729 whose development roller comprises a metal base having a resin coating in which fine conductive particles are dispersed.
An important utility of the present invention is in the rebuilding or remanufacture of spent toner cartridges or developer apparatus; i.e., the remanufacture or recycling of toner cartridges whose limited supply of toner has been depleted during use of the cartridge in a xerographic reproduction device.
U.S. Pat. Nos. 4,989,044 and 5,274,426, incorporated herein by reference, show such an expendable toner cartridge having a developing sleeve comprising a cylindrical aluminum or stainless steel base member, this base member having an outer
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Gaylord Michael F.
Roderick Randohl A.
Roderick Sheldon L.
Hancock E. C.
Ramirez Nestor R.
Sirr F. A.
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