Abstract: This invention relates to a developing unit for maintaining constant density in an electrophotographic imaging process. The developing unit has a developer roll, wherein the developer roll provides a surface and a first voltage is applied to the developer roll; a skive device, wherein the skive device is positioned in contact with the developer roll and a second voltage is applied to the skive device; a cleaning device for the developer roll, wherein the cleaning device is in contact with the developer roll; and an ink container, wherein the developer roll and the cleaning device are inside the ink container. It is preferred that a current measuring device is present to measure current flow between skive device and the developer, or a voltage meter is present to measure a voltage across a known resistor that is in series with the power supply to the skive device.

Abstract: This invention relates to a developing unit for maintaining constant density in an electrophotographic imaging process. The developing unit has a developer roll, wherein the developer roll provides a surface and a first voltage is applied to the developer roll; a skive device, wherein the skive device is positioned in contact with the developer roll and a second voltage is applied to the skive device; a cleaning device for the developer roll, wherein the cleaning device is in contact with the developer roll; and an ink container, wherein the developer roll and the cleaning device are inside the ink container. It is preferred that a current measuring device is present to measure current flow between skive device and the developer, or a voltage meter is present to measure a voltage across a known resistor that is in series with the power supply to the skive device.

Abstract: A method of producing an image on a final image receptor in a single pass electrophotographic system is provided. The method includes the steps of providing at least one toner development unit including a photoreceptive element and charged toner particles, and creating a toned image on the photoreceptive element that is transferred to an intermediate transfer member. The method further includes providing a transfer assist material development unit for applying a transfer assist material to at least a portion of the toned image to form a complete image layer on the intermediate transfer member, wherein the complete image layer is formed in a single pass of the intermediate transfer member. The method also includes contacting the complete image layer with a final image receptor while applying a bias that is sufficiently strong to transfer at least a portion of the complete image layer to the final image receptor.

Abstract: A method of producing an image on a final image receptor from image data in a multiple pass electrophotographic system is provided. The method includes the steps of applying transfer assist material to an intermediate transfer member and providing at least one development unit including a photoreceptive element and charged toner particles. During each complete processing cycle of an intermediate transfer member, a toned image is created and transferred to the intermediate transfer member by application of a bias. In multiple processing cycles of the intermediate transfer member, the transfer assist material and the at least one toned image thereby form a composite image layer on the intermediate transfer member. The method further includes contacting the composite image layer with a final image receptor while applying a bias that is sufficiently strong to transfer at least a portion of the composite image layer to the final image receptor.

Abstract: Linear spot velocity or position variations are measured in a scanning system by a process and apparatus.

Abstract: A method of producing a composite image on a final image receptor from image data in a single pass electrophotographic system is provided. The method includes steps for applying liquid transfer assist material comprising charged particles of transfer assist material to at least a portion of an element of the electrophotographic system, along with charged toner particles, in order to provide a composite image layer on a final image receptor in a single pass of a photoreceptive element through transfer of the composite image layer from another element in the system.

Abstract: A method of manufacturing transparencies reduces light scattering in a projection transparency formed with an electrostatically deposited color image. The method comprises: providing a transparent support substrate; forming an electrostatically deposited color developer image on the support substrate, the color developer image containing at least 25% by weight of organic liquid carrier, the color developer having dispersed particles comprising thermoplastic polymer therein, said dispersed particles having an effective Tg; and heating the color developer image on the support at a temperature and for a time that the thermoplastic polymer coalesces and at least some of the organic liquid carrier evaporates at a rate that free volume between the particles is reduced and light scattering is thereby reduced.

Abstract: An apparatus for oxidizing volatile organic compounds from an electrographic printer may comprising a) a printer system that vents a gas stream containing volatile organic compounds to a first inlet; b) a first mast transfer element transmitting the gas stream to a catalytic treatment system, c) The catalytic treatment system comprising separate contact sections for an unsupported catalyst and a supported catalyst; a diverter system that can direct the gas stream along paths selected from the group consisting of to the unsupported catalyst only, to the supported catalyst only, first the unsupported catalyst and then the supported catalyst, and the supported catalyst and then the unsupported catalyst.

Abstract: A printer cartridge for electrographic printing (dry or liquid) is provided with two chambers connected by a developer transportation system that traverses a development zone in a first direction. As the toner (developer) from a first of the two compartments is fed through the development zone, excess or unused toner is transported by the developer transportation system into a second of the two compartments. When the first compartment has exhausted its supply of toner, there will be sufficient toner captured in the second compartment to allow for printing capability to be maintained in the system, without any replenishment. The direction of flow of developer during printing is reversed from the second compartment to the first compartment, passing through the development zone.

Abstract: A method and apparatus for evaluating the scattering properties of a transparency image comprises projecting radiation through the transparency image to form a transmitted beam of radiation; splitting the transmitted beam of radiation into at least two distinct beams of radiation, a first distinct beam and a second distinct beam; measuring a first amount of energy in the first distinct beam that corresponds to non-scattered light; measuring a second amount of energy in the second distinct beam that corresponds to scattered light; and comparing the first amount of energy to the second amount of energy to determine the proportion of the transmitted beam of radiation that is not scattered.

Abstract: A liquid developer imaging system comprising a developing container for receiving a quantity of developing solution, a sensing system for maintaining a predetermined processing level of developing solution within the container, a developer roller connected to a first power supply source that biases the developer roller to a development voltage, and a skiving element for plating the developing solution onto the developer roller and scraping excess developing solution from the developer roller to a predetermined thickness, wherein the skiving element is connected to a second power supply source for biasing the skiving element to a skiving voltage, wherein the skiving voltage is greater than the development voltage.

Abstract: A method of maintaining a surface charge on a photoreceptor within a predetermined voltage range is provided, comprising the steps of providing a charging device adjacent to a surface of the photoreceptor, determining a reference voltage to be applied by the charging device to the photoreceptor surface to establish a first photoreceptor surface voltage, and applying the reference voltage to the surface of the moving photoreceptor with the charging device while measuring a first photoreceptor current. The method further comprises comparing the first photoreceptor current to predetermined characteristics of the photoreceptor to calculate a first output value, comparing the first output value to predetermined characteristics of the photoreceptor and calculating a first correction voltage, and applying the first correction voltage to the photoreceptor surface with the charging device to obtain a surface voltage on the photoreceptor that is within the predetermined operational voltage range.

Abstract: An optical transceiver measures optical density of a toned image. The optical transceiver comprises: a) a bifurcated optical bundle having first and second branches and a common end, each branch having a first plurality of fibers and a second plurality of fibers, respectively, wherein the branches are intermixed in the common end; b) a radiation source for producing radiation, wherein the radiation source is aligned with the first branch; c) a detector for detecting the radiation, wherein the detector is aligned with the second branch; and d) a toner receptor having a surface, wherein the toned image is on the surface and the toner receptor is aligned with the common end.

Abstract: An electrostatic transfer type liquid electrophotographic printer which has a photoreceptor web having a charged surface and opposing back surface, at least one exposing unit for forming a latent electrostatic image onto the charged surface of the photoreceptor web, and at least one development unit for developing the latent electrostatic image on the photoreceptor web into a toner image, wherein each development unit has a developer roller, a toner removal roller, and a squeeze roller, and a backup roller corresponding to at least one of the developer roller, toner removal roller, and squeeze roller, and wherein the photoreceptor web is arranged to provide at least 1 degree of contact wrap around at least one of the backup rollers. The printer further includes an electrostatic transfer unit for transferring the toner images formed in each development unit from the photoreceptor web to a print medium by electrostatic force.

Abstract: A developing unit maintains constant density in an electrophotographic imaging process. The developing unit has: a) a developer with a developing surface and a first voltage is applied to the developer; b) a depositor, wherein said depositor is positioned to maintain a gap with the developer and a second voltage is applied to the depositor; c) a cleaning device for said developer, wherein the cleaning device is in contact with the developer; and d) an ink container, wherein the developer, the depositor and the cleaning device are inside the ink container.

Abstract: A fusing apparatus for fixing images made from a liquid toner onto a substrate using an electrophotographic process, the apparatus including a first fusing station having first and second prefusing rollers, the second prefusing roller contacting the first prefusing roller to create a first nip area, wherein at least one of the prefusing rollers is heated to a temperature that provides a prefusing temperature within the first nip area, and a second fusing station spaced from the first fusing station and having first and second final fusing rollers, the second final fusing roller contacting the first final fusing roller to create a second nip area, wherein at least one of the final fusing rollers is heated to a temperature that provides a fusing temperature within the second nip area, wherein the fusing temperature of the second nip area is higher than the prefusing temperature of the first nip area.

Abstract: A fusing apparatus for fixing images made from a liquid toner onto a substrate using an electrophotographic process, the apparatus including a prefusing roller, a backup roller positioned to create a first nip area between the prefusing roller and the backup roller, and a fusing roller positioned to create a second nip area between the fusing roller and the backup roller, wherein at least one of the prefusing roller and the backup roller is heated to a temperature that provides a prefusing temperature within the first nip area, and wherein at least one of the fusing roller and the backup roller is heated to a temperature that provides a fusing temperature in the second nip area that is different than the prefusing temperature of the first nip area.

Abstract: An electrophotographic imaging process includes the steps of (a) providing an organophotoreceptor belt having a photoconductive element on an electrically conductive substrate and a seam; (b) providing an imaging apparatus comprising a developer roll; (c) mounting the organophotoreceptor belt on the imaging apparatus; (d) applying a first voltage to the photoconductive element; (e) applying a second voltage to the developer roll when the seam is at a distance less than 10% of the circumference of the organophotoreceptor belt from the developer roll, otherwise applying a third voltage; (f) applying a fourth voltage to the electrically conductive substrate; (g) moving the organophotoreceptor belt; (h) imagewise exposing the surface of the organophotoreceptor belt to radiation to reduce voltage in selected areas and thereby form a pattern of high voltage and low voltage areas on the surface; (i) contacting the surface with a liquid ink comprising colorant particles in an organic liquid to create an imag

Abstract: This invention related to a developing unit for maintaining constant density in an electrophotographic imaging process. The developing unit comprises a developer roll, wherein the developer roll comprises a surface and a first voltage is applied to the developer roll; a skive device, wherein the skive device is positioned in contact with the developer roll and a second voltage is applied to the skive device; a cleaning device for the developer roll, wherein the cleaning device is in contact with the developer roll; and an ink container, wherein the developer roll and the cleaning device are inside the ink container. It is preferred that a current measuring device is present to measure current flow between said skive device and said developer, or a voltage meter is present to measure a voltage across a known resistor that is in series with the power supply to the skive device.

Abstract: This invention related to a developing unit for maintaining constant density in an electrophotographic imaging process, said developing unit comprising: