Fee nozzle for an inkjet printer

 

(57) Abstract:

Fee nozzle is designed to spray liquid. Fee nozzle for an inkjet printer having a nozzle aperture, which includes many elements positioned across the aperture and thus podrazdelami aperture into many smaller apertures, these elements are obtained by the deposition of the foam structure in or near the aperture of the nozzle or the elements are in the form of filaments perpendicular to the main axis of the aperture, and said aperture comprises an elongated slot. These characteristics prevent possible fluid flowing away. 1 C.p. f-crystals, 5 Il.

The present invention relates to the Board of nozzles for ink-jet printer having a nozzle aperture through which napylyaetsya ink.

From hydrodynamics and technology of inkjet printers, it is known that if the liquid contained within the container, and this container has a hole below the surface of the liquid, the liquid will not necessarily flow from the container depending on the parameters of the liquid and holes. The parameters that determine whether to flow the liquid from the container or not, are: the size of the hole, powernote liquid above the hole and the force of gravity. In systems inkjet printers, such as the so-called "BubbleJet" use additional means to control the pressure that the fluid creates a hole, usually in the form of patterns of foam with open pores. The surface tension of the liquid acting on the capillary foam on the border of the liquid/air on the outer surface of the foam, can produce back pressure, which is able to balance the weight of the liquid in the foam.

There may be times when it is useful to have a large hole or crack in an inkjet printer, but where it is impossible to use the device for the deposition of the foam to produce back pressure.

From the patent EP N 0426473 A2, publ. 08.05.1991 known charge nozzle for an inkjet printer having a nozzle aperture, which includes many elements positioned across the aperture and thus podrazdelami aperture into many smaller apertures.

However, the known charge does not provide sufficient surface tension to prevent possible fluid flowing away under the action of gravity.

The technical task of the present invention is to provide a card nozzle inkjet printer, running on liquid near to the place of ejection, improving the flow of liquid to the ejection seat and the flow of charged particles to the place of ejection.

This technical problem is solved due to the fact that the Board of a nozzle for an inkjet printer having a nozzle aperture, which includes many elements positioned across the aperture and thus podrazdelami aperture into many smaller apertures, according to the invention mentioned elements obtained by the deposition of the foam structure in or near the aperture of the nozzle or the elements are in the form of filaments perpendicular to the main axis of the aperture.

These aperture may include an elongated slit.

Hereinafter the invention will be explained on the example Board of the nozzle with reference to the drawings, in which:

Fig. 1 represents a section of an inkjet printhead,

Fig. 2 is a view closeup of the aperture card nozzle

Fig. 3 and 4 represent sections through alternative embodiments of the, and

Fig. 5 is a partial perspective view of part of the continuation of the printhead containing the ejection device according to the present invention.

The figures illustrate the printers of the type generally disclosed in the description of the above-mentioned patent.

Between each of the electrodes 7 are nylon thread 9, which subdivide the gap 8 between the two components 5, 6 boards nozzle segments, corresponding to each of the electrodes 7.

In Fig. 2 shows, as under the action of surface tension of liquid formed many meniscus of the liquid, which is sprayed ink, as described in the above descriptions to patents.

In the example shown in Fig. 3 and 4, there is a gap 8, which is partially subdivided by walls 10, which are held across the side of the crack. Fig. 4 illustrates the internal structure of the foam 11, shown in General in Fig. 3. Between each pair of walls - electrode 7 and the space between the free edges of the walls 10 and the other side of the slit 8 has a foam Basotect 11. Foam 11 prevents leakage and creates a lot of elements 12, which together with the walls, divide the slit into multiple apertures 13. F. the same to the surface of the cut they are.

In a modification of this design, the foam could be replaced by separate elements of this type, for example, as shown in Fig. 2.

Another example is illustrated in Fig. 5. Fig. 5 illustrates a portion of the print head 1 spray-type, consisting of a body 2 of a dielectric material, such as synthetic plastic or ceramics. The number of grooves 3 are held on the housing 2, leaving gaps on the plate 4 sites. Grooves 3, each has an input and an output hole for ink (not shown, but indicated by the arrows 1 and 0) that are located on opposite ends of the grooves 3 so that liquid ink bearing material, which must be ejection (as described in our earlier applications), could take place within the grooves and depleted liquid to come out.

Each pair of adjacent grooves 3 forms the cell 5, plate pad or separator 4 between the pairs of grooves 3, forming a seat ejection of material and having ejection electrode 6, 6'. The drawing shows two cells 5, left cell 5 with ejection electrode 6, which has a generally triangular shape and right cell 5 with a shortened ejection electrode. Each of the cells 5 are separated by the separator 7 cells, the image is about, to ensure that the surface 8, which allows ejection electrodes extend to the outside of the cell beyond thus, as defined by the rounded surfaces 8. Shortened ejection electrode 6' is used in the target cell 5 in order to reduce the impact from changes in electric fields, which in turn are the result of changes in the voltages applied to the ejection electrodes 9 made as a metallized surface on the front sides of plastino-similar sites 4 face-to-ejection electrode 6, 6' (i.e., the internal sides of each separator cell). Ejection electrodes 9 are at the side surface of the pads 4 and the bottom surface of the grooves 3. The exact size of the ejection electrodes 9 will depend on the specific design and purpose of the printer.

Fig.5 illustrates two alternative forms for the side cover of the printer, the first of which is simple with straight edges of the cover 11, which closes the side grooves 3 in a straight line, as shown in the upper part of the figure. The second type of cover 12 is shown in the lower part of the figure, where the cover still covers the grooves 3, but has a series of boundary holes 13 passing along the grooves. Design krysta when using, and cover any shape can be used to create a surface on which the ejection electrode and/or the secondary or additional electrodes may be formed to improve the process of ejection. In addition, the fingers 15 boundary between holes 13 serve to reduce the overall size of the aperture between the opposing lids 11, 12, thus acting in accordance with the invention to divide the aperture into smaller aperture.

In all the examples mentioned above, the division of the primary aperture into many smaller allows you to use a large primary aperture (without the risk of leakage), which in turn allows you to increase the migration of material inside the liquid ejection device.

1. Fee nozzle for an inkjet printer having a nozzle aperture, which includes many elements positioned across the aperture and thus podrazdelami aperture into many smaller apertures, characterized in that the said elements obtained by the deposition of the foam structure in or near the aperture of the nozzle or the elements are in the form of filaments perpendicular to the main axis of the aperture.

2. Fee under item 1, characterized in, th is

 

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