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 apparatus and method for non-interactive, dry powder development of electrostatic images comprising: an image bearing member (12) bearing an electrostatic image; two component developer comprising toner and permanently magnetized carrier beads, the carrier having average diameter 2a and magnetization M b a developer transporting member (100) having a thickness t for transporting a developer layer of the two component developer, the layer spaced close to and out of contact with the image bearing member, and wherein the developer layer is substantially without chains of carrier beads, a multipole magnet member (400) disposed in close proximity behind 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 M 0 wherein a, M b, t, k, and M 0 , are chosen such that M b is sufficiently large to prevent the escape of developer, and a quantity is greater than about 1/3.
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.
摘要:
A process for charging layered imaging members by the transfer of ions thereto from an ionically conductive medium. In one embodiment the process comprises contacting an ionically conductive liquid or polymer with the surface of the imaging member; and applying a voltage to the medium while moving the imaging member, thereby enabling the transfer of ions to said member.
摘要:
An electrostatographic toner composition including a colorant and a resin, the resin being a polyether polymer containing repeating units of the following formula: wherein R is a residue remaining subsequent to the removal of the hydroxyl groups from a dihydric phenol, R" is an aryl or alkyl radical, Z is the residue remaining subsequent to the removal of the hydroxyl groups from an alkylene ether glycol of the formula wherein R' is a hydrogen atom, or methyl, n is an integer having a value of 2 to 4, and m is a number such that the polyether polymer has a reduced viscosity of from 0.2 to 0.6.
摘要:
An device for applying an electrical charge to a member (12) to be charged such as a charge retentive surface in an electrostatographic printing apparatus, including a multi-contact point conductive charging device (20) positioned in contact with the member (12) to be charged. The charging device (20) includes multiple electrically isolated conductive blades (22) 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 (126), as well as ionically conductive liquid carrying donor members (128). In operation, the charging device of the present invention permits generation of a charge potential on the photoreceptor (12) significantly greater than the Paschen threshold voltage, while avoiding air breakdown.
摘要:
An electrostatographic toner composition comprising a colorant and a copolymer of from about 65 mol percent to about 75 mol percent vinyl chloride and from about 25 mol percent to about 35 mol percent of a lower alkyl maleate or fumarate, the copolymer having a number average molecular weight of from about 15,000 to about 25,000 and a weight average molecular weight of from about 45,000 to about 55,000.