Recorders – Record receiver deforming
Patent
1990-05-17
1992-11-03
Fuller, Benjamin R.
Recorders
Record receiver deforming
E01D 1518
Patent
active
051609398
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to devices for the control and regulation of ink and processing thereof in a continuous ink jet printer.
The ink projection writing technique, using a continuous jet of calibrated droplets delivered by a modulation system, consists in charging these droplets electrostatically by means of an appropriate electrode. The passage of these variably charged drops between two electrodes brought to a high electric potential difference leads to deflection of the drops proportional to their charge. Such deflection combined with the movement of the medium makes possible the matrix printing of characters or graphisms on said medium.
The set of parameters conditioning the operation of the printer must be controlled so as to ensure a constant quality of the printing despite the inevitable variations of the environment.
The speed of the drops is the parameter having the most influence on the printing quality, for it conditions the passage time of the charged drops through the deflecting electric field (and so the path of the printed drops), but also the phenomenon of formation end electric charging of the drops in the charging electrode.
The quality of the ink also forms a very influential factor in the operation of printers for several reasons.
In the first place, the physical properties of the ink (viscosity, density, surface tension) condition the flow of the ink through the nozzle, as well as the physical process of formation of the drops. The main factors leading to variation of the physical properties of the ink are evaporation of the solvent of the ink and temperature variations.
In the second place, the chemical qualities of the ink which result from the concentrations of the different components of the ink must be kept constant in time. The dye concentration must be controlled so as to ensure constancy of the optical quality of the marks on the printed medium (optical density, colour, etc..). The amount of resin present in the ink must be controlled for it conditions, in certain formulations, the electric conductivity of the ink and so the electric charge of the drops. The amount of resin must in particular be controlled for the applications in which physical-chemical processing is applied to the printed deposit in a phase which is simultaneous with or subsequent to the marking, such as cross-linking under ultra-violet rays, reaction under radiation, etc.., so as to confer thereon special chemical resistance properties.
The process of formation and electric charging of the drops also conditions the printing quality. A spectacular characteristic of malfunctioning of a printer related to a defect in the process of formation of the drops is pollution of the deflection electrodes by small parasite droplets commonly called satellite drops. The process of formation and electric charging of the drops results from the interaction of complex hydrodynamic and electric phenomena, still not well described by theory. The influential parameters on this process are related both to the physico-chemical properties of the ink and to the operating characteristics of the machine : geometry, jet speed, modulation frequency and amplitude.
The purpose of the invention is to make possible control and regulation of the most influential parameters on the printing quality of an ink jet printer; drop speed, ink quality and process of formation and charging of the drops.
More particularly, an important object of the invention consists in providing control and regulation devices which are simple and compact, so adapted to compact ink jet printers.
Another important object of the invention consists in providing control and regulation devices which can be used reliably under severe and very variable environmental conditions (temperature, humidity, ventilation), as well as with different types of ink.
A field of application to which the present invention is particularly related is the field of industrial marking, in which the environmental conditions are very different and very variable in time : and large amplitude
REFERENCES:
patent: 3852768 (1974-12-01), Carmichael et al.
patent: 4323908 (1982-04-01), Lee et al.
patent: 4417256 (1983-11-01), Fillmore et al.
patent: 4612553 (1986-09-01), Kohler
Bajeux Paul
Dunand Alain
Fuller Benjamin R.
Imaje S.A.
Plottel Roland
Preston Gerald E.
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