Abstract: A print is produced on a semiporous recording medium. The semiporous recording medium is dried to an equilibrated 20% RH. Hydrophilic liquid is deposited on the medium in a selected fluid pattern within 15 seconds after the completion of drying. The recording medium is charged so that a charge pattern of charged and discharged areas is formed on the recording medium and the discharged areas correspond to the fluid pattern. Charged dry ink having charge of the same sign as the charge in the charged areas on the recording medium is deposited on the medium in a pattern corresponding to the selected fluid pattern. The dry ink is at least in part hydrophilic, so the dry ink adheres to the hydrophilic liquid, and at least some of the liquid is drawn into or around the deposited dry ink particles.

Abstract: A method of electrographically producing a toner image on paper includes drying a selected region of the paper to a moisture content not to exceed that of the paper equilibrated to 20% RH. Selected portions of the selected region of the paper are wetted within 15 seconds after the completion of drying to provide a latent fluid image corresponding to the wetted portions of the paper. A dry area is thereby defined in the selected region outside the latent fluid image. The paper is charged so that the paper in the dry area has a selected potential. Charged dry toner is deposited in the selected region, the toner having charge of the same sign as the selected potential, so that the toner adheres to paper in the area of the latent fluid image.

Abstract: A method of producing a print on paper includes drying a selected region of the paper to a moisture content not to exceed that of the paper equilibrated to 20% RH. Hydrophilic liquid is deposited in a selected fluid pattern on the selected region of the paper within 15 seconds after the completion of drying. The paper is charged so that a charge pattern of charged and discharged areas is formed on the paper, and the discharged areas correspond to the selected fluid pattern. Charged dry ink having charge of the same sign as the charge in the charged areas is on the paper is deposited onto the paper in a dry ink pattern corresponding to the selected fluid pattern in the selected region. The dry ink is fixed to the paper.

Abstract: A printer for printing on a semiporous recording medium includes a dryer adapted to dry the semiporous recording medium to a moisture content not to exceed that of the recording medium equilibrated to 20% RH. A liquid-deposition unit deposits hydrophilic liquid in a selected fluid pattern on the recording medium within 15 seconds after the completion of drying. A charging member charges the recording medium so that a charge pattern of charged and discharged areas is formed on the recording medium and the charged areas have a potential of at least 100 V. A development station deposits charged dry ink on the medium, the dry ink having charge of the same sign as the charged areas, so that the charged dry ink is deposited on the paper in a dry ink pattern corresponding to the selected fluid pattern.

Abstract: An electrophotographic (EP) printer has two toner bottles. Each has a supply volume and a waste volume separated so that toner can pass from the waste volume to the supply volume, and has a status recorder with waste and supply states. An imaging member receives toner from the supply volume of a second toner bottle in a supply receptacle, and an imaging member applies the toner to a receiver to form a print image. A cleaning device removes toner from an imaging members and transporting the removed toner to the waste volume of a first toner bottle in a waste receptacle. A toggle changes the state of the status recorder of the first toner bottle in the waste receptacle to the supply state, so that the waste toner in the waste volume of the first toner bottle is made available to be used as supply toner in the supply receptacle.

Abstract: Methods for printing are provided. In one aspect a primary imaging member having a pattern of engine pixel locations with image modulated differences of potential and with first toner having a first toner difference of potential is moved to a second development station. A second development difference of potential of the first polarity at the second development station forms a second net development difference of the second development difference of potential less any image modulated difference of potential at the individual engine pixel location and less any difference of potential relative to ground of any first toner at the individual engine pixel location. The second development difference of potential is greater than the first development difference of potential so that second toner that is different from the first toner, is developed onto the first toner using the second net development difference of potential.

Abstract: Methods for printing are provided. In one aspect, the method includes providing a primary imaging member having engine pixel locations with a ratio modulated difference of potentials, establishing a first development difference of potential to form a first net development difference of potential between the first development difference of potential and the engine pixel location and providing a first charged toner such that the second toner develops at the engine pixel location. Establishing a second development difference of potential that is greater than the first difference of potential proximate the engine pixel location such that a determined amount of first toner develops at the engine pixel locations according to a second net development difference of potential. Wherein the range of second toner potentials is such that a determined range of ratios of second toner amounts and the determined first toner amount provide ratio modulated differences of potential.

Abstract: Methods for printing are provided. In one aspect, the method includes providing a primary imaging member having engine pixel locations with a ratio modulated difference of potentials, establishing a first development difference of potential to form a first net development difference of potential between the first development difference of potential and the engine pixel location and providing a first charged toner such that the first toner develops at the engine pixel location according to the first net development difference of potential. Establishing a second development difference of potential that is greater than the first difference of potential proximate the engine pixel location such that a determined amount of second toner develops at the engine pixel locations. Wherein the range of first toner potentials is such that a determined range of ratios of first toner amounts and the determined second toner amount provide ratio modulated differences of potential.

Abstract: Methods for printing are provided. In one aspect a primary imaging member having a pattern of engine pixel locations with image modulated differences of potential and with first toner having a first toner difference of potential is moved to a second development station. A second development difference of potential of the first polarity at the second development station forms a second net development difference of the second development difference of potential less any image modulated difference of potential at the individual engine pixel location and less any difference of potential relative to ground of any first toner at the individual engine pixel location. The second development difference of potential is greater than the first development difference of potential so that second toner that is different from the first toner is developed onto the first toner using the second net development difference of potential.

Abstract: Two-component developer in an electrophotographic (EP) printer is replenished. Image data are received and a corresponding latent image is produced. Toner is supplied to the latent image by bringing developer containing toner particles and carrier particles into proximity with the latent image on the photoreceptor using a toning member, so that toner particles are removed from the developer to produce depleted developer. The depleted developer is transported to a return channel, along which it is moved at a channel speed. A processor automatically estimates, as a replenishment amount of toner to be added to the return channel, the amount of toner supplied to the latent image in a diagonal swath on the photoreceptor defined by the process surface speed and the channel speed using the received image data. The replenishment amount of toner is added to the depleted developer in the return channel to replenish the developer.

Abstract: Two-component developer in an electrophotographic (EP) printer is replenished. A replenishment amount of toner is added to depleted developer a plurality of points along the length of a return channel. The amount of toner replenished is an estimate of the amount of toner supplied to the latent image in a cross-track swath on the photoreceptor having a length defined by the process surface speed using the received image data, or using measurements of the respective potentials of the latent image or the respective densities of the visible image at a plurality of points in the cross-track swath on the photoreceptor.

Abstract: An ink jet device selectively ejects droplets of non-marking liquid ink into cells of a printing member in a desired latent negative image pattern. Certain cells of the printing member are filled with pigmented ink to create a desired image. An electrical bias is applied for fractionating pigment in the pigmented ink from liquid and transferring an image-wise pigmented ink pattern from the printing member to a receiving member, leaving behind a substantial portion of liquid. The receiver can be an intermediate member whereby the image-wise ink pattern is transferred from the intermediate member to a final receiver, while such receiver is in operative association with said intermediate member.

Abstract: A printing apparatus having an imaging member having an external surface and a series of substantially equal sized cells located over such surface. The printing apparatus includes an ink jet device for selectively ejecting droplets of ink, having marking particles and liquid, into the cells of said imaging member in a desired image-wise ink pattern, a mechanism for filling the cells of said imaging member with a dielectric fluid after said ink jet device ejects droplets of ink into said cells, and transfer mechanism including a device for fractionating the marking particles in the ink from the liquid and transferring the image-wise marking particle pattern to a receiver member.

Abstract: An ink jet device selectively ejects droplets of non-marking liquid ink into cells of a printing member in a desired latent negative image pattern. Certain cells of the printing member are filled with pigmented ink to create a desired image. An electrical bias is applied for fractionating pigment in the pigmented ink from liquid and transferring an image-wise pigmented ink pattern from the printing member to a receiving member, leaving behind a substantial portion of liquid. The receiver can be an intermediate member whereby the image-wise ink pattern is transferred from the intermediate member to a final receiver, while such receiver is in operative association with said intermediate member.

Abstract: A printing apparatus having an imaging member having an external surface and a series of substantially equal sized cells located over such surface. The printing apparatus includes an ink jet device for selectively ejecting droplets of ink, having marking particles and liquid, into the cells of said imaging member in a desired image-wise ink pattern, a mechanism for filling the cells of said imaging member with a dielectric fluid after said ink jet device ejects droplets of ink into said cells, and transfer mechanism including a device for fractionating the marking particles in the ink from the liquid and transferring the image-wise marking particle pattern to a receiver member.

Abstract: A black toner composition comprises dried pigmented LC toner particles comprising a thermoplastic polymer and a carbon pigment having a BET value of up to about 140, and submicron particulate addendum material disposed on the dried pigmented LC toner particles. A process for forming the toner composition comprises: forming pigmented LC toner particles comprising a thermoplastic polymer and a carbon pigment having a BET value of up to about 140, drying the pigmented LC toner particles, and blending the dried pigmented LC toner particles with submicron particulate addendum material.

Abstract: A method and apparatus for reducing triboelectrically generated background development on a photoconductive primary image member bearing an electrostatic latent image pattern including background portions. In an electrophotographic black and white or color copier/printer, the primary image member is moved through a development zone. The image member includes a photoconductive element and a thin protective overcoat layer, the overcoat layer being between 0.1 .mu.m and 15 .mu.m in thickness and of a composition having between about 0.1% and about 10% by weight of a material that is an ionic conducting material and containing an electronegative group. The latent electrostatic image pattern is formed on the overcoat layer. Electrographic developer includes hard magnetic carrier particles and electrically insulative toner particles and moves through the development zone in contacting developing relation with the electrostatic charge pattern.

Abstract: Photoconductor scumming in an electrophotographic copying machine is substantially eliminated by using a synthetic fiber cleaning brush that is substantially free from low yield strength, low surface energy materials.

Abstract: A method and apparatus for forming a desired image on a receiver are disclosed. The method comprises transferring marking toner particles from an intermediate transfer member to a receiver in the presence of an electric field which urges the marking toner particles toward the receiver. When transferring the marking toner particles to the intermediate transfer member, the surface of the intermediate transfer member contacts non-marking toner particles in some areas which receive marking toner particles. The intermediate transfer member comprises a blanket layer having a Young's modulus of about 10.sup.8 Newtons/m.sup.2 or less.