Abstract: A control system for use with a development process including at least one magnetic roll with a settable speed is provided. The controller is directly or indirectly responsive to a reload feedback signal, which signal is generated in response to changes in output reload performance of the development process. In the case of direct responsiveness, the controller uses one or more reload feedback signals to facilitate magnetic roll speed setting. In the case of indirect responsiveness, the controller uses a reload sensitivity signal, which reload sensitivity signal varies as a function of input digital image content and output reload performance feedback, to facilitate magnetic roll speed setting.

Abstract: Optimization of transfer settings for a given paper and environmental condition is achieved by running a series of prints with varying settings of a transfer parameter such as voltage or current. The mass remaining on the intermediate belt after transfer is monitored for each of the prints. This may be achieved using the same sensor used to monitor and control the developed mass on the intermediate transfer member, such as a transfer belt. A suitable sensor is an Extended Toner Area Coverage (ETAC) mass sensor. Because the control is based on actual conditions for a given paper and environment, it can ensure optimum copy quality over a wide range of papers and conditions, while enabling the minimum target mass per unit area to assure the proper density.

Abstract: A control system for use with a development process including at least one magnetic roll with a settable speed is provided. The controller is directly or indirectly responsive to a reload feedback signal, which signal is generated in response to changes in output reload performance of the development process. In the case of direct responsiveness, the controller uses one or more reload feedback signals to facilitate magnetic roll speed setting. In the case of indirect responsiveness, the controller uses a reload sensitivity signal, which reload sensitivity signal varies as a function of input digital image content and output reload performance feedback, to facilitate magnetic roll speed setting.

Abstract: Optimization of transfer settings for a given paper and environmental condition is achieved by running a series of prints with varying settings of a transfer parameter such as voltage or current. The mass remaining on the intermediate belt after transfer is monitored for each of the prints. This may be achieved using the same sensor used to monitor and control the developed mass on the intermediate transfer member, such as a transfer belt. A suitable sensor is an Extended Toner Area Coverage (ETAC) mass sensor. Because the control is based on actual conditions for a given paper and environment, it can ensure optimum copy quality over a wide range of papers and conditions, while enabling the minimum target mass per unit area to assure the proper density.

Abstract: A toner composition includes toner particles having at least one spacer of substantially monodisperse latex particles that are dried and attached to the toner particles, in which the attached latex particles have an average particle size of from about 60 nm to about 500 nm. The presence of the spacer enables improved toner transfer efficiency maintainability while maintaining excellent tribo level, tribo stability with aging, charge through performance and cohesion behavior with aging.

Abstract: A printing system includes a plurality of marking engines for applying images to print media. An output destination is configured for receiving imaged print media from the plurality of marking engines. A print media transport system conveys print media between the marking engines and the output destination. A control system determines whether the marking engines are printing images of consistent or acceptable gloss and, where the marking engines are determined not to be consistent or providing acceptable gloss, adjusts at least one of the plurality of marking engines to reduce a variation in gloss between images applied by the marking engines.

Abstract: A development system for an electrophotographic system including: a magnetic brush roll speed selector for selecting a rotational speed for a magnetic brush roll in a development system of the electrophotographic system; and a controller, responsive to the rotational speed, for adjusting xerographic actuators to maintain DMA within a predefined range.

Abstract: An improved development system for an electrophotographic system includes a reload defect detector for generating a signal corresponding to a potential for reload defect detected in an image to be developed by an electrophotographic system; and a magnetic roll speed selector for selecting a rotational speed for a magnetic roll in a development system of the electrophotographic system, the selected rotational speed corresponding to the generated reload defect potential signal. The speed of the magnetic roll is selected to be a lower speed in response to the potential for reload defect being relatively low. The slower rotation of the magnetic roll prolongs the life of the developer and extends the operational life of the development system before corrective action is needed.

Abstract: A xerographic printing system includes a group of marking modules which apply a marking medium to print media, at least one of the marking modules being a custom marking module. A control system is configured for being operatively linked with marking modules. The printing system has a first mode of operation in which a first plurality of the group of marking modules is operatively linked to the control system and a second mode of operation in which a second plurality of the marking modules is operatively linked to the control system, the second plurality of marking modules including the at least one custom marking module.

Abstract: A black toner of toner particles including at least one binder, at least one black colorant, and a package of external additives is described, wherein the at least one binder includes a styrene acrylate binder and wherein the external additives include each of a first silica having an average particle size of from about 35 to about 45 nm, a second silica having an average particle size of from about 135 to about 160 nm, and a titania having an average particle size of from about 35 to about 45 nm. Also described is a developer that includes the black toner and carrier particles comprising a core of ferrite coated with a coating comprising a polymethyl methacrylate polymer and fluoro-copolymer, carbon black and melamine beads. The black toner and developer are preferably used in a semiconductive magnetic brush development system.

Abstract: A toner composition includes toner particles having at least one spacer of latex particles or polymer particles attached to the toner particles, in which the latex or polymer particles have an average particle size of from about 60 nm to about 500 nm. The presence of the spacer enables improved toner transfer efficiency maintainability while maintaining excellent tribo level, tribo stability with aging, charge through performance and cohesion behavior with aging and includes forming toner particles with grinding, and following completion of the grinding step, attaching to the toner particles at least one spacer selected from the group consisting of latex particles and polymer particles, wherein the latex particles or polymer particles have an average particle size of from about 60 nm to about 500 nm.

Abstract: A process including:mixing toners in a fluidized bed;electrostatically loading the resulting toner mixture onto a donor roll;ion charging the resulting layer of toner on the donor roll; anddeveloping a latent image with the resulting charged toner layer on the donor roll member, wherein the color characteristics of the resulting developed color images encompass substantially the entire PANTONE.RTM. color space.

Abstract: A process including:blending toners from a set of primary toners to form a set of secondary toners; anddeveloping the secondary color toners to form spot color images, wherein the color gamut of all said images embody substantially the entire PANTONE.RTM. spot color space.

Abstract: A yellow toner including:a resin, anda colorant comprising a mixture of a yellow pigment and a yellow dye, wherein the combined weight of the colorant is from about 1 to about 50 weight percent of the total weight of the toner, and wherein the chroma of developed toner is from about 90 to about 130 CIELAB units.

Abstract: An apparatus for developing a latent image recorded on an imaging surface, including: a housing defining a reservoir storing a supply of developer material wherein the developer material having predefined triboelectric charge about 20 to 30 microCoulombs/gram. A donor member is mounted partially in the housing and spaced from the imaging surface, for transporting toner on an outer surface of the donor member to a region opposed from the imaging surface. An electrode member is disposed in between the donor member and the imaging surface. A system is provided for loading a region of the doner member with developer material. A charging device ion charges the toner loaded on the region of the donor member to a predefined charge level. A power supply electrically biases the electrode member positioned in close proximity to the imaging member to detach toner from the region of the donor member as to form a toner cloud for developing the latent image.

Abstract: An apparatus and process for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus by providing a composition coating including a polymer, lubricant and inorganic material, on at least a portion of the electrode member.

Abstract: A color electrophotographic printing machine in which latent images having a resolution of at least 1.44 million pixels per square inch are recorded on a photoconductive member. Different color toner powder images are developed in superimposed registration with one another to form a composite multicolor image. The composite multicolor image is transferred from the photoconductive member to a receiving member. Toner particles which have a selected pigmentation and small volume average diameters are used to minimize curl of the receiving member.

Abstract: An electrostatographic imaging process includes forming an electrostatic latent image on an image forming device, developing the electrostatic latent image on the image forming device with at least one developer containing carrier particles and a blend of two or more compatible toner compositions, and transferring the toner image to a receiving substrate and fixing it thereto. Among the compatible toner compositions that may be selected are toner compositions having blend compatibility components coated on an external surface of the toner particles and particulate toner compositions containing therein blend compatibility components or passivated pigments. Electrostatographic imaging devices, including a tri-level imaging device and a hybrid scavengeless development imaging device, are also provided for carrying out the described process.

Abstract: An apparatus develops an electrostatic latent image on a charge-retentive surface. A donor roll is selectably rotatable in a process direction and in a reverse direction relative to the process direction. A toner mover loads toner particles onto a portion of the surface of the donor roll. A metering blade is disposed downstream of the toner mover in the process direction. A seal is disposed upstream of the toner mover in the process direction, and is adapted to remove at least approximately half of the undeveloped toner from the donor roll.

Abstract: An apparatus develops an electrostatic latent image on a charge-retentive surface. A donor roll is selectably rotatable in a process direction and in a reverse direction relative to the process direction. A toner mover loads toner particles onto a portion of the surface of the donor roll. A metering blade is disposed downstream of the toner mover in the process direction. A seal is disposed upstream of the toner mover in the process direction, and is adapted to remove at least approximately half of the undeveloped toner from the donor roll.