Recorders – Record receiver deforming
Patent
1986-07-11
1988-05-10
Shaw, Clifford C.
Recorders
Record receiver deforming
G04D 1518
Patent
active
047439220
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a single nozzle ink jet printing head.
The ink jet printing technique includes forming a continuous jet of calibrated drops, supplied by a modulation system then in electrostatically charging these drops by means of charge electrodes, so as to deflect each drop by means of an electric field so that if the support on which it is desired to write and the writing device are moving relatively to each other, the formation of a printing matrix is obtained.
In an ink jet printer, the above mentioned function, namely the fragmentation of the jet into calibrated drops, the electrostatic charge thereof and deflection thereof are obtained by means of a device called printing head in the rest of the description.
The role of this head is fundamental for the correct operation of an ink jet printer. In particular the path of the drops ejected at the level of the injection nozzle must be perfectly defined with respect to the charge electrodes the deflection plates and the support which receives the impression. The printing head complying with these criteria must in addition be compact, require no adjustment during operation and allow simple and reliable adjustments to be made previous to starting up. Finally, this head must have a great facility of access for maintenance purposes.
A printing head corresponding to these criteria has been described in a French patent application 82 03975 filed on the 7th Mar. 1983 by the applicant. In this printing head, the means for breaking the jet and ejecting the drops are fixed to the body of the cap and the charging and deflecting means are fixed to the lid of said cap.
In the present application, on the other hand, all these essential elements of the printing head are fixed to one and the same monolithic piece, this architecture contributing to reducing the space required by the assembly without adversely affecting the adjustment facilities, nor the isolating conditions, particularly of the deflection electrodes.
Another object of the invention is to described a support block for the integrated charge control electrodes and deflection plates.
Another object relates to a safety device limiting the current in the circuit feeding the deflection means.
The invention also relates more precisely to a single nozzle ink jet printing head of the type having an ink supply circuit, a signal amplifier, an ink recovery detector, means for breaking the jet and ejecting the drops, means for charging and deflecting the drops; characterized in that the whole of these means is fixed to a monolithic piece serving, on the one hand, as base for the means and, on the other hand, as case for cooperating with a lid for forming the covering cap of the head.
The invention will be better understood from the following explanations and accompanying Figures in which:
FIG. 1 illustrates an important part of a printing head including the essential functional elements such as the drop formation and injection means, the means for charging the drops and the deflection means.
FIGS. 2 and 3 illustrate schematically the main elements described with reference to FIG. 1.
FIG. 4 is an exploded view of the components forming a printing head in accordance with the invention.
For the sake of clarity, the same elements bear the same references in all the Figures.
As shown in FIG. 1, completed by FIGS. 2 and 3 to which the rest of the description simultaneously refers, a printing head 1 according to the invention is formed of a monolithic piece 2. This piece 2 fulfills two functions: on the one hand it plays the role of cap body, and on the other it serves as base for all the means providing the essential functions of the head: namely, particularly the means for forming and ejecting the drops, charging them and deflecting them. A lid closes the case but it has no other function, contrary to what happens in the case of the printing head described in the above mentioned patent, no other function than that of closing the case, while allowing the combination of the above mentioned means to be examined when
REFERENCES:
patent: 4356499 (1982-10-01), Kodama
patent: 4417256 (1983-11-01), Fillmore et al.
patent: 4520367 (1985-05-01), Ishikawa et al.
Regnault Luc
Reynaud Jean-Louis
Imaje S.A.
Plottel Roland
Preston Gerald E.
Shaw Clifford C.
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