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 process and apparatus prints images. The process provides an imaging surface; an array of styli opposed to the imaging surface; and a flow of liquid ink containing charged ink particles in the ink between the imaging surface and the array of styli. A voltage bias is established between at least one stylus in the array of styli and the imaging surface. The voltage bias plates at least some charged ink particles onto the imaging surface in response to the voltage bias.

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

Abstract: A method measures the conductivity (?) of a liquid or paste electrophotographic toner by providing two parallel plane conductive plates with a uniform separation (d) between the plates to form a space between the plates; filling the space between the plates with liquid or paste electrophotographic toner; applying an alternating current voltage of at least 100V between the plates across the liquid or paste toner; measuring as data the current passing through an external component into the plates; adjusting the data to remove current contributions attributable to impurity ions; sending adjusted data to a processor; and determining the conductivity from the adjusted data.

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: 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: A prospective liquid toner is evaluated for potential electrostatic imaging performance. A drop of the prospective toner is applied on a flat surface, the prospective toner is electrically plated onto an electrically resistive compliant roller. The roller carries the plated liquid toner and applied the plated toner to a substrate. The plated toner is transferred to the substrate and the transferred toner qualities such as least length, width, and shape are compared to standards expected from a liquid toner of acceptable performance characteristics.

Abstract: A testing procedure and method is provided for assessing the quality or acceptability of performance of individual liquid ink electrostatic toners on individual receptor surfaces. An approximately standard drop of the individual liquid toner is placed on the receptor to be tested. The drop is pressed onto the receptor and spread on the surface of the receptor (preferably before the drop has had time to partially evaporate or to have the liquid in the drop absorb or naturally spread on the receptor surface) under controlled conditions. The characteristics of the spread drop on the receptor surface are measured, and the characteristics are compared to parameters defining the characteristics expected from a liquid toner that define acceptable performance between toner and receptor. In this manner the relative performance of individual toners on individual receptor surfaces can be evaluated independent of electrostatic effects.

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: An optical transceiver measures optical density of a toned image.

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:

Abstract: An electrophotographic imaging process includes the steps of

Abstract: An injection spraying system includes a container having a compartment configured to hold a first fluid. A valve body is removably coupled with the container and includes a mixing chamber, an inlet passageway configured to deliver a second fluid to the mixing chamber, a discharge passageway extending from the mixing chamber, a stem compartment communicating with the mixing chamber through a control orifice, and a transition passageway in fluid communication with the stem compartment. Movably disposed within the stem compartment is a metering stem having a tapered nose configured to selectively engage the control orifice. An adjustment knob is mounted to the metering stem such that rotation of the adjustment knob selectively advances and retracts the metering stem within the chamber of the meter tube. A siphoning tube has one end disposed within the compartment of the container and an opposing end in fluid communication with the transition passageway.

Abstract: A system for registration of one or more color separation images on a photoconductor belt prevents misregistration that otherwise can occur between different scan lines and between different latent images due to side-to-side movement of the photoconductor belt. The registration system operates to detect movement of the photoconductor belt. Based on the detected movement, the system operates to control modulation of laser beams used to form the latent images to ensure precise registration of the color separation images. As one advantage, the movement of the photoconductor belt can be detected precisely and inexpensively by a photodetector scanned with the same laser beam used for imaging.

Abstract: A method and apparatus for minimizing image banding and for registering multiple image planes of a single image on a receptor drum in electrographic systems. The system for registering multiple image planes of a single image in an electrographic system includes a receptor drum capable of capturing two or more overlaying image planes, an exposure device for forming overlaying image planes on the receptor drum, and at least one developer station transferring a developer to the receptor drum corresponding to each of the overlaying image planes. A measuring device is provided for measuring the rotational position of the receptor drum. A drive mechanism is provided for controlling a motor coupled to the receptor drum by at least one drive belt. A closed loop positioning system is coupled to the measuring device and the drive mechanism. The closed loop positioning system is capable of modulating the angular velocity of the receptor drum to achieve image plane registration of the two or more image planes.