Recorders – Record receiver deforming
Patent
1988-05-19
1990-02-27
Reynolds, B. A.
Recorders
Record receiver deforming
G01D 1518
Patent
active
049050184
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an ink jet printing head; it relates more particularly to its applications to industrial plotters.
BACKGROUND OF THE INVENTION
These latter appear in different forms, but all are composed of a part carrying the sheets (support medium) for receiving the plots, another part supporting one or more styluses, these two parts being set in relative movement, either by moving the sheets, or by moving the styluses, or by a combination of both methods.
In these industrial plotters, the styluses depositing the ink are often either ballpoint pens, or felt tips, or else hollow tips for special inks of Indian ink type.
These styluses have several drawbacks among which may be mentioned the need of contact, during printing, between the printed medium and the stylus. Now, in the technology of the stylus and the quality of the surface of the printed medium, the quality of the plot is not constant and is not always the best, particularly when the medium to be printed is abrasive on the surface (paper . . . ), which results in a useful life of the stylus which is often very short, regardless of its technology.
Another drawback resides in the fact that the absence of printing during movement of the printed medium requires the stylus to be lifted, which results in a considerable waste of time during execution of the plot. Furthermore, on resuming the plot, the ink of the stylus does not always flow instantaneously, whence marks appear at the beginning of the plot.
A difficulty also arises as regards the compatibility between the ink, the technology of the stylus, and the quality of the medium to be printed which is not obvious and which results in greatly limiting the quality and the useful life of the plot on its medium. Generally, for each type of medium (different qualities of paper, mylar, polyester film . . . ), it is advisable to use a different type of stylus (ballpoint pens, felt tips, hollow tubes . . . ).
OBJECT OF THE INVENTION
The object of the invention is to avoid all of the above mentioned drawbacks, by proposing a solution of replacing existing styluses by a continuous ink jet printing head adapted to the needs of industrial plotting.
SUMMARY OF THE INVENTION
The invention concerns more precisely a continuous ink jet printing head associated with an ink flow system, comprising a recovery channel, this head being formed essentially of a modulation system, an ejection nozzle, electrodes for charging the drops, and a deflection system, characterized in that this deflection system includes a set of deflection plates placed and fed by means of an electronic circuit so that the electric field (E) for deflecting the drops is orientable through an angle which may vary from 0.degree. to 180.degree..
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood from the following explanations and the accompanying FIGS. in which:
FIG. 1 illustrates diagrammatically the standard ink jet technique;
FIG. 2 is an illustration of the thicknesses of the variable lines which may be obtained by the ink jet technique;
FIGS. 3a and 3b illustrate diagrammatically and respectively a printing head according to a first embodiment of the invention seen from the front, and the deflection plates of the head seen from above;
FIGS. 4a, 4b and 4c illustrate the operation of the set of deflection plates of the first embodiment of the invention;
FIG. 5 shows a plot on a medium with orientations of the patterns of different dots;
FIG. 6 illustrates the corrected relative head-medium path as a function of the rotation radius of the pattern of dots;
FIGS. 7a and 7b illustrate respectively in a front view a second embodiment of a printing head according to the invention and, seen from the top, the combination of the set of deflection plates cooperating with a recovery channel of adapted shape;
FIG. 8 illustrates the path of the drops in the second embodiment;
FIGS. 9a, 9b, 9c and 9d illustrate the operation of the deflection plates of the second embodiment;
FIG. 10 illustrates
REFERENCES:
patent: 3914772 (1975-10-01), Kashio
patent: 3972052 (1976-07-01), Atumi et al.
patent: 4384296 (1983-05-01), Torpey
Patent Abstracts of Japan, vol. 5, No. 127, (M-83) (799) Aug. 15, 1981, See the Whole Abstract & JP, A, 5664874 (M. Nagagaki) Jun. 2, 1981.
Imaje S.A.
Preston Gerald E.
Reynolds B. A.
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