Abstract: An image revealing squeegee device for an electrocoagulation printing apparatus including a positive cylindrical electrode having a central longitudinal axis and a passivated surface on which dots of colored, coagulated colloid representative of a desired image are formed by electrocoagulation of an electrolytically coagulable colloid present in a colloidal dispersion containing a coloring agent, the positive electrode having a predetermined radius and being rotatable about the longitudinal axis in a predetermined direction.

Abstract: An image is reproduced and transferred onto a substrate by (a) providing a positive electrode having a continuous passivated surface moving at constant speed and defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of a colloid present in an electrocoagulation printing ink containing a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image.

Abstract: The invention relates to a printing head system for an electrocoagulation printing apparatus. The printing head system of the invention comprises an electrode carrier, a linear array of electrolytically inert electrodes electrically insulated from one another and mounted to the electrode carrier, the array of electrodes being arranged into a plurality of groups each having a predetermined number of closely spaced electrodes, and a driver circuit for addressing the electrodes of selected groups. The driver circuit is responsive to a graphical data input signal to cause simultaneous passage of electric current through at least a major portion of the electrodes in a selected one of the groups, the major portion of electrodes including electrodes that are contiguous with one another. Such a printing head system is capable of improving the quality of the image reproduced by electrocoagulation of an electrolytically coagulable colloid.

Abstract: An image revealing squeegee device for an electrocoagulation printing apparatus including a positive cylindrical electrode having a central longitudinal axis and a passivated surface on which dots of colored, coagulated colloid representative of a desired image are formed by electrocoagulation of an electrolytically coagulable colloid present in a colloidal dispersion containing a coloring agent, the positive electrode having a predetermined radius and being rotatable about the longitudinal axis in a predetermined direction.

Abstract: A polychromic image is reproduced and transferred onto a substrate by (a) providing a positive electrode moving at substantially constant speed along a predetermined path, the electrode having a passivated surface defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of an electrolytically coagulable colloid present in an electrocoagulation printing ink containing a coloring agent; and (c) bringing an endless belt moving at the same speed as the positive electrode and having on one side thereof a colloid retaining surface adapted to releasably retain dots of electrocoagulated colloid, into contact with the positive electrode active surface to cause transfer of the dots of colored, coagulated colloid from the positive electrode active surface onto the colloid retaining surface of the belt and to thereby imprint same with the image.

Abstract: The present invention provides a record sheet used in an electro-coagulation printing method for forming characters and images on a cylinder as an electrode with an ink which coagulates with electric charge and for transferring the characters and images to the record sheet, wherein the wet time is 15 milliseconds or less, obtained from the absorption curve of pure water measured by a dynamic scanning absorptometer. Preferably, the record sheet has 5 ml/m.sup.2 s.sup.-1/2 or more absorption coefficient, and more preferably, has contact ratio measured by a specular reflection smoothness tester under a pressure of 40 kg/cm.sup.2 with a ray having a wavelength of 0.5 .mu.m is 40% or more. The record sheet can be used for various print sheets, in particular, for business form sheets and newspaper sheets.

Abstract: An improved electrocoagulation printing method comprising the steps of (a) providing a positive electrolytically inert electrode having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of an electrolytically coagulable colloid present in an electrocoagulation printing ink comprising a liquid colloidal dispersion containing said electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte and a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colored, coagulated colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image.

Abstract: An improved electrocoagulation printing method comprising the steps of (a) providing a positive electrode formed of an electrolytically inert metal and having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of an electrolytically coagulable colloid present in an electrocoagulation printing ink comprising a liquid colloidal dispersion containing the electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte and a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colored, coagulated colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image.

Abstract: An improved electrocoagulation printing method comprising the steps of (a) providing a positive electrode formed of an electrolytically inert metal and having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of an electrolytically coagulable colloid present in an electrocoagulation printing ink comprising a liquid colloidal dispersion containing the electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte and a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colored, coagulated colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image.

Abstract: In a process for creating a data base for the reproduction of a copy on a web of material, primary colors are first applied on a sample of the web of material singly, in pairs, or three together in different quantitative proportions of color (a1, a2, a3) in respectively predetermine screen areas (16). Then, the individual screen areas (16) are colorimetrically measured in order to determine color correction values dependent on the quantitative proportions of color (a1, a2, a3). Thereafter, a dot-by-dot colorimetric measurement of the copy takes place in order to obtain, in each case, color values of the copy. The color values are then corrected by the color correction values in order to obtain corrected quantitative proportions of color for each dot of the copy. These corrected quantitative proportions of color are stored and can be used at a later point in time in order to define, for example, hole sizes in the screen printing stencils for reproduction of the copy.

Abstract: A polychromic image is reproduced and transferred onto a substrate by (a) providing a single positive electrode formed of an electrolytically inert metal and having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid by electrocoagulation of an electrolytically coagulable colloid in the presence of a coloring agent, the dots of colored, coagulated colloid being representative of a desired image; and (c) bringing a substrate into contact with the dots of colored coagulated colloid image to cause transfer of the colored, coagulated colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image.

Abstract: An image forming method including the steps of bringing an image-forming liquid in which finely-divided resin particles are dispersed in a dispersion medium into contact with an image-bearing member capable of repelling the dispersion medium of the image-forming liquid, and selectively applying heat and/or pressure to the image-bearing member or the image-forming liquid by use of a heat-application system and/or pressure-application system in accordance with signals corresponding to an image to be formed to deposit imagewise the finely-divided resin particles in the image-forming liquid on the surface of the image-bearing member, thereby obtaining a resin image corresponding to the image on the image-bearing member. In addition, an image forming apparatus for the above-mentioned image forming method is disclosed.

Abstract: Disclosed is an electronic printer employing tri-level xerography to superimpose two images with perfect registration during the single pass of a charge retentive member past the processing stations of the printer. One part of the composite image is formed using MICR toner, while the other part of the image is printed with less expensive black, or color toner. For example, the magnetically readable information on a check is printed with MICR toner and the rest of the check in color or in black toner that is not magnetically readable.