Abstract: In one embodiment, a fuser roll for fusing toner images onto a substrate includes a substantially rigid core member, a deformable, heat conductive base layer overlaying the surface of said core member, and an outer layer supported on the base layer. The outer layer is formed of a heat conductive, conformable amorphous metal.

Abstract: A device for metering toner to a predefined toner bed height on a donor member, including a composite trim bar having a support portion and a cutting portion, adjacent to the donor member, attached to the support portion.

Abstract: A device for metering toner to a predefined toner bed height on a donor member, including a composite trim bar having a support portion and a cutting portion, adjacent to the donor member, attached to the support portion.

Abstract: Image systems and methods adjust hue angles of one or more colors in an image. The adjusted image may be output to a printer for printing. An image quality control is provided to allow a user to select one or more specific colors whose rendition is unacceptable. Each color may be tested to see if that color is outside the range of colors which can be printed accurately or acceptably on the target printer. If the selected color is outside the range of printable colors, a variety of alternatives can be offered to arrive at the best possible rendition. Otherwise, a variety of hue shifts can be offered, where each hue shift alters the rendition of only those colors having hue angles that are near the offensive color.

Abstract: A printing subsystem for use in a network printing system, having a database communicating with a client browser, is provided. The database includes a plurality of data sets and the client browser includes a program with a set of instructions for displaying at least one of the plurality of data sets on a user interface display screen. The printing subsystem is disposed remotely of and communicates with both of the database and the client browser. The printing subsystem includes a marking engine and a copy of the program, the program copy receiving the at least one of the plurality of data sets for placing the same in a displayable format. An interface communicates with the program copy for converting the at least one of the plurality of data sets from the displayable format to a printable format, and a print buffer is employed to store the at least one of the plurality of data sets in the printable format in anticipation of producing a print therefrom.

Abstract: A color electrophotographic printing machine, wherein an electrostatic latent image recorded on a photoconductive member is developed with toner of a first color and toner of a second color to form a visible image thereof, the electrophotographic printing machine including a system, for removing contaminates from toner of a first color and toner of a second color moving from a toner dispenser to a developer housing, the system including: a mounting assembly, a filter system mounted on the mounting assembly, the filter system having a screen for permitting toner of the first color to travel therethrough while inhibiting contaminants from traveling therethrough when vibrated; a first vibration driver, operatively connected to the screen, for vibrating the screen; a second filter system mounted on the mounting assembly, the filter system having a screen for permitting toner of the second color to travel therethrough while inhibiting contaminants from traveling therethrough when vibrated; and a second vibration d

Abstract: An apparatus for filtering contaminants from marking particles is provided. The apparatus includes a conduit and a mover for moving the marking particles within the conduit. The apparatus also includes a screen positioned adjacent the conduit so that substantially all the marking particles discharged from the conduit pass through the screen.

Abstract: In a multi-color imaging apparatus utilizing a recharge step between two image creation steps for conditioning a charge retentive surface pursuant to forming the second of the two images, a voltage sensitive corona generating device having a high characteristic slope described in a graph of the current delivered to a charge receiving surface (I) vs. grid minus charge receiving surface voltage (V) is used to both reduce the residual toner voltage across the previously toned image, and to charge the toned and untoned areas of the charge retentive surface to a substantially uniform level so that developability conditions for the subsequent image are improved.

Abstract: An apparatus for filtering contaminants from marking particles within a conduit is provided. The apparatus includes a mover for moving the marking particles in the conduit and a screen positioned adjacent the conduit so that the marking particles pass through the screen. The apparatus also includes an applicator for applying an electrical bias between the mover and the screen to facilitate the passage of marking particles through the screen.

Abstract: An apparatus for correcting color images in an electrophotographic printing machine in which a first image is developed on a photoconductive surface, the second and subsequent images are superimposed over the first developed image. The apparatus includes an input device for inputting an image signal having a plurality of color components. An image processing unit processes the inputted signal. The image processing unit includes an adaptive exposure processor that modulates the exposure level of a raster output scanner (ROS) for a given pixel as a function of toner previously developed at the pixel site, thereby allowing toner layers to be made independent of each other.

Abstract: A developer unit includes a housing defining a chamber for storing a supply of toner therein. The developer unit also includes a member for moving the toner in the chamber of the housing and a support structure, projecting from the housing, for supporting the member. The developer unit further includes a bearing located in the support structure. The bearing is spaced from the housing and rotatably supports the member.

Abstract: A development unit for electrostatic printing is designed to eliminate used developer at a steady rate. A barrier mounted in the housing defines in the housing a first chamber adapted to store a supply of developer material therein, and a second chamber adapted to receive excess developer material from the first chamber of the housing. A transport is mounted in the second chamber, for advancing developer material from the barrier.

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.

Abstract: A developer unit for developing a latent image recorded on an image receiving member with marking particles, to form a developed image. The unit includes a donor member spaced from the image receiving member and adapted to transport marking particles to a development zone adjacent the image receiving member and an electrode positioned in the development zone between the image receiving member and the donor member. The developer unit also includes a biaser for electrically biasing the electrode with an alternating current having a frequency varying with time, so as to minimize natural frequency resonant vibrations of the electrode and to detach marking particles from the donor member forming a cloud of marking particles in the development zone with detached marking particles from the cloud of marking particles developing the latent image.

Abstract: A sheet transport system for automatically transporting sheets is provided. The system includes a primary path apparatus for feeding printed sheet images there, along a printing station to imprint sheets. The sheet transport system also provides an apparatus for transporting selected ones of the sheets along the path to a sheet path portion remote from the primary path and for returning selected ones of the sheets to the other fed sheets so that the combined sheets are arranged in a collated manner corresponding to the predetermined sequence. The system also includes, in the secondary or shunt path, a buffer for holding sheets previously passing through the printing station. The secondary path is arranged to permit selected return of ones of the sheets in the shunt path to the primary path. The system may also include a path for returning printed sheets in the primary path to the printing station.

Abstract: An apparatus in which an electrostatic latent image recorded on a photoconductive member is developed with toner. A donor roll, spaced from the photoconductive member, transports toner to a development zone adjacent the photoconductive member. An electrode member is positioned in the development zone between the photoconductive member and the donor roll. The electrode member is electrically biased to detach toner from the donor roll so as to form a toner powder cloud in the space between the electrode member and the photoconductive member. A unitary magnetic roll is located in the housing to transport developer material to a reload zone where toner particles are attracted from magnetic carrier granules to the donor roll. The parameters are selected to optimize reload and suppress strobe lines.

Abstract: In a scavengeless development apparatus, an electrode wire is disposed between a donor roll and a latent image to form a powder cloud of toner to develop the latent image. The donor roll includes a section of increased diameter spaced away from the latent image, and the electrode wire is disposed in sliding contact with the section of increased diameter to obtain a consistent spacing from the main length of the donor roll.

Abstract: Attributes of a toner patch transferred from an imaging member (e.g., a photoreceptor or other charge-sensitive substrate) to a transfer member, such as an intermediate or electrostatic belt or drum, are measured. Measurement of attributes of the toner patch located on the transfer member can be used to monitor characteristics of the toner image formation process so that the toner development process can be appropriately controlled. These measurements can be used to improve the toner development process stability, and thus maintain superior print quality. The toner patch attributes measured include, for example, the voltage and the mass of the toner patch. Toner patch voltage is measured by an electrostatic voltmeter located adjacent to the transfer member. Toner patch mass is measured by one or more densitometers for measuring the developed toner patch mass, the transferred toner patch mass, and/or residual toner patch mass.

Abstract: An electrophotographic printing machine adapted to print process color or highlight color documents. The printing machine operator selects either a color process unit or a highlight color process unit and inserts the selected unit into the printing machine. The printing machine, in conjunction with the inserted unit, prints the document corresponding to the selected unit. In this way, either a highlight color or a full color document is printed by the same printing machine.

Abstract: A printing machine in which two electrostatic latent images are recorded on a photoconductive member. One of the latent images is a charged area latent image with the other image being a discharged area latent image. A magnetic developer unit develops the charged area latent image with black toner particles. A non-magnetic developer unit develops the discharged area latent image with toner particles of a color other than black. The toner particles from both latent images are transferred substantially simultaneously to a sheet and fused thereto forming a color high lighted document.