Method and apparatus for correctably printing characters with sublimable ink
AssigneeIng. C. Olivetti & C., S.p.A.
InventorsArnaldo Pasini, Claudio Dalmasso, Riccardo Brescia, Roberto Bosio
Life of this patent
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Abstract
A correctable print is obtained by using an easily sublimable ink. Said print is completely erased when heated at a temperature insufficient to cause the darkening of the paper, by means of a hot point, of hot air, or of radiant energy.
Claims17
A method for correctably printing alphanumeric characters visible under ordinary light, comprising the steps of printing the characters with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines, and producing local concentrated heating only of the improperly printed characters to be erased and not of the properly printed characters by applying a stream of hot air over said characters to be erased, so that the erasure of said improperly printed characters is effected leaving said properly printed characters intact.
A method for correctably printing alphanumeric characters visible under ordinary light, comprising the steps of printing the characters with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines, and producing local concentrated heating only of the improperly printed characters to be erased and not of the properly printed characters, by pressing against each improperly printed character to be erased a hot metallic element.
A method for correctably printing alphanumeric characters visible under ordinary light, comprising the steps of printing the characters with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines, and producing local concentrated heating only of the improperly printed characters to be erased and not of the properly printed characters, by means of a lamp whose radiant energy is concentrated upon each improperly printed character to be erased.
An apparatus for correctably printing alphanumeric characters visible under ordinary light, comprising ink printing means for printing alphanumeric characters with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines, and erasing means associated with said printing means and operable for providing local concentrated heating only of the improperly printed characters to be erased, and not of the properly printed characters, including a pipe carrying hot air and a nozzle connected to said pipe.
An apparatus for correctably printing characters visible under ordinary light, comprising ink printing means for printing alphanumeric characters with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines and erasing means associated with said printing means and operable for providing local concentration heating only of the improperly printed characters to be erased, and not of the properly printed characters, including a metallic element having a surface sufficient to completely cover each improperly printed character to be erased, means conditionable for heating said metallic element and means for pressing said metallic element against said improperly printed character.
An apparatus for correctably printing characters visible under ordinary light, comprising a point writing element supplied with an ink containing sublimable coloring agents selected from the group consisting of anthraquinone, azo, azomethines, stilbenes, nitrodiarylamines, acridines, xanthones and diazines and conditioned to trace the characters to be printed by a combination of movements according to the X, Y and Z axes, and erasing means operable for providing local concentrated heating only of the improperly printed characters to be erased and not of the properly printed characters by means of a lamp whose radiant energy is concentrated upon each improperly printed character to be erased.
Dependencies are inferred from the claim text.