Ink jet printing head

Incremental printing of symbolic information – Ink jet – Ejector mechanism

Patent

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Details

347 90, B41J 218

Patent

active

054574846

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention refers to an ink jet printing head intended particularly for printing large characters. It also refers to any process implementing such a head.


BRIEF DESCRIPTION OF THE PRIOR ART

The applications of ink jet printing are constantly increasing and are leading to a constant search for improved performances. There is a problem with obtaining large characters as they are presently found in applications of the ink jet technique related to the printed characters known as code bars. It was thus desirable to find a solution to this problem. We know that the specifications specific to printing code bars dictate height and thickness, as well as the relative positioning of the characters (bars).


BRIEF DESCRIPTION OF THE INVENTION

The goal of the present invention is to meet these requirements while providing the required precision for these parameters, implementing the ink jet technique while remaining within minimal dimensional limits. For this, the applicant had the idea to have at least two nozzles work together in a single casing in such a way that the rasters, produced from the jet emitted by each of these nozzles, fit together, increasing the dimensions of the rasters accordingly. This does not mean simply coupling two printing heads of the standard type, for such a solution would lead to complexity of control and dimensions such that this solution would be hard to use. What is involved is making a number of nozzles fed by a single ink circuit cooperate, as was stated above, in the same casing. These nozzles supply a number of jets of ink drops intended to join together, with the unused drops being recovered in a recovery module shared by all the nozzles.
More precisely, the invention refers to a printing head with a continuous jet of ink drops loaded and deflected to form a raster printed on a support; characterized in that this head has, in a single casing (1), at least two modulation bodies (A and B) comprising the jet nozzles fed by a single ink circuit and a module (30) for recovery of unused drops shared by all the jets, with a single recovery outlet nipple (350), with each of the jets of drops emitted by each of the nozzles controlled in such a way that each of the adjacent rasters printed on the support fit together to form a continuous raster (T).


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be more easily understood with the help of the explanations below and the attached illustrations, of which:
FIG. 1 represents in diagram form and in exploded view a casing of the printing head in conformity with the invention, with all its main components;
FIG. 2 illustrates in diagram form one of the components shown in FIG. 1;
FIG. 3 is a diagram of the recovery module and FIG. 4 is an overhead view of this module to help show how it works;
FIG. 5 shows a support intended to be placed on the casing in FIG. 1;
FIG. 6 shows an initial cover to be joined to the support in FIG. 5, and an umbilical and another support implemented when the head according to the invention is working with an umbilical;
FIG. 7 is a diagram explaining the sequencing that loads the drops;
FIG. 8 is a diagram of the arrangement of the logical sequencing circuits;
FIG. 9 is an additional explanatory diagram.


DETAILED DESCRIPTION OF THE INVENTION

For greater clarity any given elements are denoted by the same references in all illustrations.
In an application related to printing code bars, the thickness of the code dictates the diameter of the nozzles for an ink/printed support combination. The height of the code to be printed, along with the printing speed, dictates the number of nozzles to be incorporated in the printing head as well as the number of drops printed in a raster by each nozzle. In the example described below, which is not the only possibility, there are two nozzles. The relative positioning of the bars requires cooperation among the different nozzles with regard to mechanical adjustments as well as control electronics.
The printing head, in its two-nozzle version in confor

REFERENCES:
patent: 3956756 (1976-05-01), Paton
patent: 4060804 (1977-11-01), Yamada
patent: 4219822 (1980-08-01), Paranjpe
patent: 4268836 (1981-05-01), Huliba et al.
patent: 4307407 (1981-12-01), Donahue et al.
patent: 4364055 (1982-12-01), Aiba
patent: 4791434 (1988-12-01), Wills
patent: 4794407 (1988-12-01), Vonasek
patent: 4928114 (1990-05-01), Fagerquist et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 3, Aug. 1973 Joseph, D. L. "Gutter for Synchronized Ink Jet Printing," pp. 756-757.

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