Abstract: An apparatus and method for homogenizing developer allow variations in image quality between marking engines to be reduced. The apparatus includes a developer homogenizer in communication with the marking engines which receives developer from the first marking engine and developer from the second marking engine and combines them. A first portion of the combined developer is returned to the first marking engine for forming images therewith and a second portion of the combined developer is returned to the second marking engine for forming images therewith.

Abstract: An apparatus for loading one or more donor rolls of a developer unit, comprising a developer housing having a reservoir for a developer material, a rotatable first donor roll that delivers the toner onto a moving photoconductive member, a trim roll that receives developer material from the reservoir and delivers the developer material to a first magnetic brush roller that delivers toner to the first donor roll, and a rotatable second magnetic brush roll that receives the developer material from the first magnetic brush roll and delivers the toner to the first donor roll. The apparatus may further comprise a rotatable second donor roll that receives the toner from the second magnetic brush roll and delivers the toner onto the photoconductive member, and a rotatable third magnetic brush roll that receives the developer material from the second magnetic brush roll and delivers the toner to the second donor roll.

Abstract: An apparatus for loading one or more donor rolls of a developer unit, comprising a developer housing having a reservoir for a developer material, a rotatable first donor roll that delivers the toner onto a moving photoconductive member, a rotatable first magnetic brush roll that receives the developer material from the reservoir and delivers the toner to the first donor roll, and a rotatable second magnetic brush roll that receives the developer material from the first magnetic brush roll and delivers the toner to the first donor roll. The apparatus may further comprise a rotatable second donor roll that receives the toner from the second magnetic brush roll and delivers the toner onto the photoconductive member, and a rotatable third magnetic brush roll that receives the developer material from the second magnetic brush roll and delivers the toner to the second donor roll.

Abstract: Xerographic imaging modules, xerographic apparatuses including the xerographic imaging modules and methods of making the xerographic imaging modules are disclosed. An embodiment of the xerographic imaging modules includes a photoreceptor roll having a photoconductive surface, a donor roll adjacent the photoreceptor roll for supplying toner to the photoconductive surface, and a toner loading roll adjacent the donor roll for supplying the toner to the donor roll. The toner loading roll includes a core comprised of a foam first material, and a non-porous surface region comprised of the first material. The surface region surrounds the core and forms an outer surface of the toner loading roll.

Abstract: A specific magnet roll design for high speed semi-conductive magnetic brush (SCMB) development systems for magnetic image character recognition (MICR) printing is provided. The resulting magnetic field distributions include a more uniform radial field and enhance solid area development and halftone graininess without or substantially without bead carryout issues. In addition, this enhancement of solid area development enables magnetic toner in these hill speed SCMB systems that normally would not provide sufficient development latitude for MICR.

Abstract: An apparatus for loading one or more donor rolls of a developer unit, comprising a developer housing having a reservoir for a developer material, a rotatable first donor roll that delivers the toner onto a moving photoconductive member, a trim roll that receives developer material from the reservoir and delivers the developer material to a first magnetic brush roller that delivers toner to the first donor roll, and a rotatable second magnetic brush roll that receives the developer material from the first magnetic brush roll and delivers the toner to the first donor roll. The apparatus may further comprise a rotatable second donor roll that receives the toner from the second magnetic brush roll and delivers the toner onto the photoconductive member, and a rotatable third magnetic brush roll that receives the developer material from the second magnetic brush roll and delivers the toner to the second donor roll.

Abstract: An apparatus for loading one or more donor rolls of a developer unit, comprising a developer housing having a reservoir for a developer material, a rotatable first donor roll that delivers the toner onto a moving photoconductive member, a rotatable first magnetic brush roll that receives the developer material from the reservoir and delivers the toner to the first donor roll, and a rotatable second magnetic brush roll that receives the developer material from the first magnetic brush roll and delivers the toner to the first donor roll. The apparatus may further comprise a rotatable second donor roll that receives the toner from the second magnetic brush roll and delivers the toner onto the photoconductive member, and a rotatable third magnetic brush roll that receives the developer material from the second magnetic brush roll and delivers the toner to the second donor roll.

Abstract: A development system is provided that extends the functionality of liquid developer to produce custom colors and combines it with a powder development engine to enable custom color printing. An apparatus for developing an image on an imaging surface, including: a first developer unit having dry marking particles therein for developing a first portion of the image; and a second developer unit having a solution of marking particles and liquid carrier therein for developing a second portion of the image.

Abstract: A development system is provided that extends the functionality of liquid developer to produce custom colors and combines it with a powder development engine to enable custom color printing. This invention provides a apparatus and method, control scheme, hardware, and software, necessary for enabling custom color printing using an electrophotograpic hybrid technology.

Abstract: An electrographic, two-component dry developer composition including charged toner particles and oppositely charged carrier particles which (a) includes: an combination of a soft magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated, exhibit an induced magnetic moment of less than 20 EMU/gm of carrier when in an applied field of 1000 gauss and (b) a hard magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated, exhibit an induced magnetic moment of at least 20 EMU/gm of carrier when in an applied field of 1000 gauss.

Abstract: In a development system there is provided a developer transport adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon, including: a housing defining a chamber storing a supply of developer material including carrier and toner; a donor member, mounted partially in the chamber and spaced from the imaging surface, for transporting developer on an outer surface thereof to a region opposed from the imaging surface, the donor member having a magnetic assembly having a plurality of poles, a sleeve, enclosing the magnetic assembly, rotating about the magnetic assembly; a plurality of trim bars positioned about the donor member at a predefined positions and spacing around the donor member, the plurality of trim bars progressively reducing developer bed height of the developer material on the donor member to a predefined developer bed height within a development nip.

Abstract: A method for developing an electrostatic image including contacting the image with at least one magnetic brush including (a) a rotating magnetic core of a preselected magnetic field strength, (b) an outer nonmagnetic shell, (c) An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged binder-free carrier particles which (a) include: an alloy of a soft magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated, exhibit an induced magnetic moment of less than 20 EMU/gm of carrier when in an applied field of 1000 gauss and (b) a hard magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated, exhibit an induced magnetic moment of at least 20 EMU/gm of carrier when in an applied field of 1000 gauss and which magnetic moment is sufficient to prevent the carrier from transferring to the electrostatic image, the toner and carrier particles in the developer having a triboelectric force of attra

Abstract: A development system is provided that extends the functionality of liquid developer to produce custom colors and combines it with a powder development engine to enable custom color printing. An apparatus for developing an image on an imaging surface, including: a first developer unit having dry marking particles therein for developing a first portion of the image; and a second developer unit having a solution of marking particles and liquid carrier therein for developing a second portion of the image.

Abstract: An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged carrier particles which (a) includes: a soft magnetic material exhibiting a coercivity of less than 300 gauss when magnetically saturated and (b) exhibit an induced magnetic moment of less than 20 EMU/gm of carrier when in an applied field of 1000 gauss; and a hard magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated and (b) exhibit an induced magnetic moment of at least 20 EMU/gm of carrier when in an applied field of 1000 gauss.

Abstract: A toner maintenance system for an electrophotographic developer unit, including a sump for storing a quantity of developer material comprised of carrier and toner material; a first member for transporting a mixture of developer material and toner particles from the sump, the first member having a voltage applied thereto; a metering blade, positioned closely adjacent to the first member to maintain the compressed pile height of the developer material on first member at a desired level; and a sensor device for measuring the current between the first member and the metering blade, and generating a signal indicative thereof.

Abstract: In a development system including a developer transport adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon, including: a housing defining a chamber storing a supply of developer material comprising soft magnetic toner; a donor member, mounted partially in the chamber and spaced from the imaging surface, for transporting developer on an outer surface thereof to a region opposed from the imaging surface, the donor member having a magnetic assembly having a plurality of poles, a sleeve, enclosing the magnetic assembly, rotating about said magnetic assembly; and a vibrating member positioned in between the magnetic assembly and the sleeve at a predefined position around the donor roll, the vibrating member fluidizing the developer material on the donor member to prevent developer bed freezing, to prevent long-range carrier bead chain formation, and to smooth developer bed height-banding on the donor member before a development zone.

Abstract: In a development system there is provided a developer transport adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon, including: a housing defining a chamber storing a supply of developer material comprising carrier and toner; a donor member, mounted partially in the chamber and spaced from the imaging surface, for transporting developer on an outer surface thereof to a region opposed from the imaging surface, the donor member having a magnetic assembly having a plurality of poles, a sleeve, enclosing the magnetic assembly, rotating about said magnetic assembly; a trim bars positioned about the donor roll at a predefined position and spacing around the donor roll, the trim bar including a vibrating member for disrupting the developer bed and reducing developer bed height of the developer material on the donor member to a predefine developer bed height within the development nip.

Abstract: A method for developing an electrostatic image including contacting the image with at least one magnetic brush including (a) a rotating magnetic core of a preselected magnetic field strength, (b) an outer nonmagnetic shell, (c) means for reducing bead chaining of carrier particles, and (d) an electrographic, two-component dry developer composition including charged toner particles and oppositely charged soft ferrite carrier particles exhibiting (i) a coercivity of less than 500 gauss when magnetically saturated sufficient to cause the developer to flow circumferentially on the shell in a direction opposite the direction of magnetic core rotation and (ii) an induced magnetic moment of less than 25 EMU/gm when in an externally applied field of 1000 gauss, and which magnetic moment is sufficient to prevent the carrier from transferring to the electrostatic image, the toner and carrier particles in the developer having a triboelectric force of attraction which is greater than the magnetic force of attraction betw

Abstract: In a development system including a developer transport adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon, including: a housing defining a chamber storing a supply of developer material comprising soft magnetic toner; a donor member, mounted partially in the chamber and spaced from the imaging surface, for transporting developer on an outer surface thereof to a region opposed from the imaging surface, the donor member having a magnetic assembly having a plurality of poles, a sleeve, enclosing the magnetic assembly, rotating about said magnetic assembly; and a vibrating member positioned in between the donor roll and the sleeve at a predefined position around the donor roll, the vibrating member fluidizing the developer material on the donor member to prevent developer bed freezing, to prevent long-range carrier bead chain formation, and to smooth developer bed height-banding on the donor member before a development zone.

Abstract: An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged carrier particles which (a) includes: a soft magnetic material exhibiting a coercivity of less than 300 gauss when magnetically saturated and (b) exhibit an induced magnetic moment of less than 20 EMU/gm of carrier when in an applied field of 1000 gauss; and a hard magnetic material exhibiting a coercivity of at least 300 gauss when magnetically saturated and (b) exhibit an induced magnetic moment of at least 20 EMU/gm of carrier when in an applied field of 1000 gauss.