摘要:
This invention relates to a process for rapidly charging uncharged toner particles to a positive polarity, which comprises adding uncharged toner particles to a positively charged developer composition comprising carrier particles and toner particles, the charged and uncharged toner particles containing conductive particles or conductive patches on their surface, which conductive patches are of a higher positive triboelectric charge than the toner polymer, contacting the charged toner particles with the uncharged toner particles causing positive charges to be transferred from the conductive particles on the charged toner particles, to conductive particles on the uncharged toner particles, within a period of from about 5 seconds to about 2 minutes, thereby resulting in substantially the same level of positive charge intensity for both the original charged toner particles and the added toner particles, such charge intensity ranging from about 5 microcoulombs per gram to about 50 microcoulombs per gram.
摘要:
An apparatus and method for non-interactive, dry powder development of electrostatic images includes an image bearing member bearing an electrostatic image; two component developer comprising toner and permanently magnetized thickly coated carrier beads, the coated carrier beads having magnetizable core radius r, average radius a, and magnetization Mb, with the ratio r/a being given as K; a developer transporting member having a thickness t for transporting a developer layer of the two component developer, wherein the layer is spaced close to and out of contact with the image bearing member, a multipole magnet member disposed in close proximity to the transporting member and moving relative to it so as to sweep poles across its surface, the magnet member having a periodic magnetization of spatial frequency k and a peak magnetization M0 wherein Mb, t, k, and M0, are chosen such that Mb is sufficiently large to prevent the escape of developer, a quantity C in the equation C = 2.2 ( M 0 M b ) 1 K 3 ⅇ - k t k a is greater than about ⅓, and the ratio K is a quantity less than about ¾, and preferably less than about ½, so as to weaken bead-bead interaction and thus enhance the desired provision of a compressed developer layer.
摘要:
A method and apparatus for improving the quality of an image that is developed by a liquid carrier is disclosed. The invention relates to image blotting and is directed to reducing disruptive forces on the wet image during blotting. The invention relates to the conditions under which liquid carrier is removed from the surface of an image supportable member.
摘要:
An device for applying an electrical charge to a member to be charged such as a charge retentive surface in an electrostatographic printing apparatus, including a multi-contact point conductive charging device positioned in contact with the member to be charged. The charging device includes multiple electrically isolated conductive blades which are independently electrically biased at predetermined voltage levels so as not to exceed a Paschen threshold voltage differential. Alternative embodiments are disclosed incorporating conductive blade members, as well as ionically conductive liquid carrying donor members. In operation, the charging device of the present invention permits generation of a charge potential on the photoreceptor significantly greater than the Paschen threshold voltage, while avoiding air breakdown.
摘要:
An imaging member comprised of a supporting substrate with a coating thereover and wherein the coating is comprised of resin, electrically conductive metal oxide particles, and insulative metal oxide particles, wherein each electrically conductive particle is substantially electrically isolated and separated from any other of the electrically conductive particles by the insulative particles.
摘要:
An apparatus for fusing images to a sheet. A fuser device is provided using a transparent fusing roll having an internal heating device which focuses the energy to a narrow area of the roll adjacent the nip formed with a pressure roll. A transparent fuser roll is used in a pressure nip fusing system to take advantage of the quick response of a focused lamp system while at the same time yielding the desirable image quality attributes of the pressure nip in two roll fusing. The focused lamp is completely enclosed and the heated region of the paper is within the nip contact region so there exists no possibility of igniting the paper. A lateral temperature smoothing device, or leveling roll, is also provided to maintain a fairly uniform temperature axially across the fuser roll. This is particularly useful for a wide fuser roll, i.e., 17 inches, through which narrower paper, i.e., 11 or 14 inches, is passing to prevent the ends of the fuser roll which do not contact the paper from overheating. A quick start up from cold start is possible so that no standby power is required.
摘要:
An electrophotographic process which comprises the generation of a latent image; developing the image with a toner composition comprised of resin particles, magnetite particles, and a polymeric fluorocarbon; and subsequently providing the developed image with magnetic ink characters thereon to a reader/sorter device whereby toner offsetting and image smearing is avoided or minimized in said device.
摘要:
An apparatus for powder cloud development of an electrostatic image in which a donor roll advances toner to a development zone adjacent the image, and in which precipitating electric fields are provided at the entrance and exit of the development zone to redeposit undeveloped toner onto the surface of the doner member, whereby unwanted airborne emissions of toner are substantially reduced.
摘要:
A carrier composition comprised of a core comprised of a magnetic oxide with a coating thereover comprised of the reaction product of a metal, preferably a zinc vapor and the magnetic oxide.