There is disclosed a printing, feeding and severing method and apparatus for carrying out the method. The apparatus includes a print head assembly and a platen assembly movable relatively toward and away from each other into and out of printing cooperation, mechanism for inking the print head assembly, mechanism for feeding a web of record members to between the print head assembly and the platen assembly, the web being in roll form and there being means to assist the gradual unwinding of the ro...

An improved sympathetic ink is composed of a substantially water insoluble cellulose ether such as ethyl cellulose and methylene chloride or a solvent containing methylene chloride, preferably a mixture of methylene chloride and trichloro ethylene.

An ink composition which comprises an aliphatic hydrocarbon solvent having dissolved therein a resinous binder and a modified dye, said modified dye being a reaction product obtained by reacting a dye having at least one group of --CO.sub.2 M and --SO.sub.3 M in the molecule wherein M is an alkali metal with an organic ammonium compound.

An ink drop printer system in which ink drops of uniform size and free of secondary drops are formed by pulsing an ink nozzle with a d.c. pulse signal having a slow relaxation or decay time. The trailing edge of the d.c. pulse decreases slowly in amplitude, approximately reaching a base line level prior to the occurrence of the next d.c. pulse. Ink drop size is varied by superimposing a low frequency a.c. signal on the d.c. pulse. Ink drop response time is improved by applying a high frequency s...

An ink composition which comprises an alicyclic hydrocarbon solvent having dissolved therein a resinous binder and a modified dye, said modified dye being at least one species selected from the group consisting of a reaction product obtained by reacting a dye having at least one group of --CO.sub.2 M and --SO.sub.3 M in the molecule wherein M is an alkali metal with an organic ammonium compound and a reaction product obtained by reacting a basic dye with an acid compound.

A reproduction system includes an ink applicator body which is positioned adjacent to a surface to be inked for transferring ink from the body to the surface. The applicator body has an array of lands and depressions or grooves formed on a surface thereof. A means for supplying ink to the applicator is provided and an improved doctor means for regulating the ink on the applicator includes an elongated body of generally circular cross section which is formed of an elastomeric material and means f...

Disclosed is an ink composition which comprises an aqueous liquid vehicle, a colorant, and an additive material selected from the group consisting of amine alkoxylates, sorbitan monoester alkoxylates, alkylene oxide adducts of glycerine, and mixtures thereof.

Colored ink comprising a developer having a phenolic hydroxyl group, an electron-donating colorless dye which develops a color by the action of the developer, and a solvent which does not inhibit a color developing reaction. Handwriting written in this colored ink can be erased by using an eraser comprising a desensitizing compound which makes the colored electron-donating dye colorless.

An ink for ink-jet recording is provided which, although contains free copper ions, has anticorrosive properties and is free from the formation of a precipitate caused by the free copper ion. The ink for ink-jet recording containing the free copper ion includes cyclohexylammonium carbamate serving as an anticorrosive.

An ink for ink-jet recording is provided, which makes it possible to obtain vivid recorded matters by satisfying both of the prevention of the feathering and the prevention of the bleeding even when the recording is performed on regular paper. The ink for ink-jet recording contains a self-dispersing type microparticulate coloring agent, a surfactant, and water. When the surface tension is plotted in the vertical axis, and the concentration of the surfactant is plotted in the horizontal axis, the...