JPH02500732A - Multilayer ink print head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Multilayer ink print head Technical field The present invention relates to an insulator having a multilayer structure as defined in the generic concepts of claims 1 to 7. The present invention relates to an ink printhead and a method of manufacturing the same.

Background technology Ink printers with piezoelectrically driven drive elements are generally known and have It is used in many ways. In West German Patent Application No. 3242283, A multilayered ink that essentially has a basic body with built-in supply passages for A jet print head is described. This supply passage has a connecting pipe fitting. Ink is supplied to the ink head via the connecting pipe joint. Said The supply passage communicates with nine restrictive passages that branch laterally on the surface of the basic body. Another supply path for the rollers leads to it. This throttle passage enters the conical pressure regulating chamber from the side. I understand. A nozzle passage is arranged at the center of this pressure regulating chamber. This noz The channel itself is guided through the unique substrate of the inkjet printhead; Then, at the lower end of the base, the nozzles of the nozzle plate are arranged closely adjacent to each other. I understand. This nozzle plate body is pressed against the base body via a tension spring. be done.

The basic body in which the pressure regulating chamber and the nozzle passage are carved is the entire part of the main body of the same chamber. covered by a metal diaphragm. This metal diaphragm has a drive The elements are arranged, preferably glued. .

The manufacturing of the basic body and the connection with the metal diaphragm are performed by first forming a conical chamber and a diaphragm in the chamber body. This is done by carving a passageway and then drilling a nozzle passageway. Then metal da The iaphragm and the basic body are automatically joined together by diffusion welding.

Due to the large number of required work steps, ink printheads configured in this way are is difficult. Moreover, the length of the nozzle passage and its diameter within the bulky structure of the substrate This has a negative effect on the print quality or on the operating efficiency of the piezoelectric drive element.

Ink is supplied to the pressure regulating chamber inside the hardwood body through nine constriction passages that open sideways to the pressure regulating chamber. This creates an inconvenient cross section in the pressure regulating chamber for flow, which prevents ink from penetrating. Obstruction occurs in the flow. Centrally placed nozzle passage and horizontal ink inlet This type of conical pressure regulating chamber also prevents air pollution caused by, for example, ink outgassing. It has the disadvantage that bubbles are very difficult to remove from this pressure regulating chamber. Removal of this bubble , the pressure on the side of the container exerts pressure on the ink, which increases the pressure! by l'jj It is possible to some extent. However, with this, only the air bubbles present in the center of the pressure regulating chamber is simply removed.

Air bubbles attached to the periphery may not be reached by the flow inside the wall, or the air bubbles may be and therefore greatly disturb the overall print head rectification condition. flow is interfered with.

The configuration disclosed in European Patent Invention No. 0037624 is designed to prevent this. To achieve this, the ink flow is distributed so that the ink flows along the wall area in the pressure regulating chamber. However, lands are placed in the inflow and outflow areas of the pressure regulating chamber.

This land is difficult to manufacture due to its size on the one hand, and on the other hand in the pressure regulating chamber. This results in undesirable flow resistance which again has an adverse effect on the rectification conditions of the flow.

The object of the invention is to create a multilayer ink print head of the type mentioned at the outset in a simple and It can be manufactured with few work processes and has a good distribution route for ink. As a result, even if air bubbles do enter, they can be easily removed. It's about doing.

Disclosure of the invention “ This problem is addressed in multilayer ink printheads of the type mentioned in the introduction. The problem is solved according to the features described in Items 7 to 7.

Advantageous embodiments of the invention in the dependent claims? It is characterized by

The ink print head is a sandwich structure ink head that can be manufactured separately. , which accepts the same sand inch structure ink head and has an integrated ink supply section. The entire ink printing spatula is very easy to manufacture because it consists of a receiver and a receiver. can be built. In this case, the sandwich ink head has a corresponding ink channel. Consists of multiple overlapping plates that make up the Tightly connected.

In this case, one side of the sand inch structure ink head is covered by a diaphragm plate. The other side of the sand-inch structure ink head is connected by a nozzle plate. configured.

In this way, it has a short nozzle path length which allows for high printing frequencies. A very small and flat size is obtained for the printed ink printhead.

Such as the pressure regulating chamber, ink passage and nozzle passage of a sandwich structure ink head. All areas that contain ink are made up of through-holes in individual plates. Advantageously, the ink head is made of a molded material that can be manufactured particularly easily by stamping. and can be joined in one process by diffusion welding. I can do it.

The inventive manufacturing process of the ink print head allows for metal bonding of individual plates. It is therefore possible to form and shape very fine contours. this Ink heads with a sand inch structure were placed in a clean room and visualized. It can be manufactured by a manufacturing method. The piezoelectric plate configured as a driving element can be glued or soldered. It can be easily bonded to a metal diaphragm by attaching it.

Similarly, the nozzle passage of the pressure regulating chamber and the ink supply passage are perpendicular to the diaphragm plate. Since they flow into the pressure regulating chamber diametrically opposite each other, air bubbles will not form inside the open pressure chamber. Ink bubbles are easily removed from the pressure chamber by rinsing. can be removed.

On the one hand, since the aperture passage is configured as a passage with an elongated cross section, the ink is On the other hand, pressure waves cannot pass through it. is guaranteed.

Due to the very small dimensions of the sand-inch ink heads, the system The natural frequency of the entire system is very high, and the stabilization time of the ink in the neutral pressure region is Always short. This results in a high injection frequency.

Embodiments of the invention are shown in the drawings and explained in more detail below. .

Brief description of the drawing FIG. 1 is a schematic exploded view of a multilayer ink print head; FIG. 2 is a perspective sectional view of an ink head having a sandwich structure; FIG. 4 is a schematic cross-sectional view taken along the cutting line in FIG. 3.

Figure 5 is a schematic diagram of the pressure regulating chamber with the attached throttle section, and Figure 6 is the sandwich construction. An outline of the nozzle arrangement when a built-in ink head is composed of 24 nozzle heads. Schematic diagram, BEST MODE FOR CARRYING OUT THE INVENTION Two ink print heads are located in the ink printer, not shown in detail. , the same ink printhead is guided along the document line by line during the printing operation.

The layered ink print head has an ink supply passage 11 therein. A receiver 10 is provided with a fitting 12 for connection to an ink bottle (not shown). Become. This receptor IO can be made of thermoplastic synthetic resin, Then, a print carrier (not shown) of the ink printer is connected via the fixing member 13. screwed to the edge.

The receptor 10 is a separately manufactured sandwich structure of a so-called planar ink head. It is used to receive a built-in ink head. This sand inch structure ink The head, in the embodiment of FIG. It is composed of metal plates.

One boundary side of the sandwich ink head has a thickness of 0.031111 mm. It is formed by a diaphragm plate 14 made of nickel. This diaphragm plate On top is a piezoelectric plate with a diameter of approximately 1 si+ corresponding to the number of nozzles (24 in this case). is arranged as a driving element of the pressure regulating chamber.

The diaphragm plate is followed by a pressure adjustment plate 9, and the pressure adjustment chamber plate is also made of nickel crack. and has a thickness of 0.21111 mm, corresponding to the desired height of the 5 mm crown.

The pressure regulating chamber plate 16 contains all the pressure regulating chambers 17 and inlets of the sand inch structure head. There is a feed structure 18 for supplying water. Similarly, the pressure regulating chamber plate 16 has a thickness of approximately A 0.1 fin cover plate 19 follows. This cover plate covers the nozzle passage of each pressure regulating chamber 17. 2o and the communication area of the ink supply passage 21, and is also a component of the ink supply section. It also includes a blank space 22 at a certain point.

There is a slit-like elongated cross section in the subsequent aperture plate 23 with a thickness of approximately Q, l ff1 l. A portion 24 for changing the surface and a space 25 serving as a component of the ink supply section are provided. ing.

The sand inch structure ink head is mounted on the nozzle plate 26 (thickness 0.1! II). It will be closed. This nozzle plate.

Similarly, it is made of nickel, and the same plate has a nozzle opening 27 corresponding to the desired degree of decomposition. are arranged.

After manufacturing individual metal plates by etching, punching or electroforming, are stacked in layers and joined together by diffusion welding. For this purpose, each board They are pressed together and exposed to high temperatures in a protective gas or atmosphere. this place The mixing temperature and holding time depend on the particular material of the nozzle plate.

Diffusion welding creates a planar metal bond and is free from excess solder and adhesive. The ink printhead manufacturing It is advantageous in construction. In addition, a heat-resistant structure is obtained and the head is A single metal can be used. Implementing this kind of easy-to-pack Tx/H construction From a printing perspective, each plate is made of a material suitable for etching, such as German silver. silver-plating each plate to achieve a good welded bond; It is advantageous to weld the silver-plated part to the nickel part. be. Diffusion welding in this case involves a temperature between 40 and 90% of the absolute melting temperature of the part material. Possible at temperature. Achieving a material bond with silver that is advantageous for diffusion welding For this purpose, it is sufficient to silver plate at least the second plate in each layer. It's a minute.

Sand inch structure ink spatula production (this process can be fully automated) . ), then remove one piezoelectric plate 15 from the diaphragm unless previously done. Paste it on the board 14.

The ink head of the sand inch structure constructed in this way is now connected to the connecting member 28. It can be attached to the receptor 10 via.

Many modifications can be made to the configurations of the pressure regulating chamber, the ink passage, and the throttle passage.

The configuration that can be seen from FIGS. 2 to 5 has been found to be advantageous. The nozzle passage 2o .

The individual pressure regulating chambers 17 and the nozzle plate 26 extend linearly. Nozzle passage 20 also Similarly, the ink supply passages 21 are arranged parallel to each other and are formed in a cylindrical shape here. 2 and 5 at the diametrical edge of the pressure regulating chamber communicate with the same pressure chamber. This distribution Due to the configuration advantageous to pressurization, the ink flowing through the pressure chamber is sometimes Remove any air bubbles that may be present. Therefore, air bubbles may remain inside the pressure regulating chamber. There isn't.

Upstream of the pressure regulating chamber with respect to the direction of ink movement, there is a throttle passage with an elongated cross section. There are 9 parts of the aperture.

On the one hand, the elongated cross section of this aperture part allows the ink to correspond to the printing frequency. It is ensured that rapid flow is possible and on the other hand that pressure waves cannot pass through. All Ink is supplied to all the aperture portions 24 via a common ink supply section 29.

As is particularly clear from Figures 3 and 4, the ink is directed in different planes of the structure. Therefore, the pressure regulating chambers 17 can be separated from each other only by the thin structural web 30. You can do it. For this reason, the arrangement density of pressure regulating chambers is high.

Due to the very small lx dimensions of the sand inch ink heads, the system The overall natural period is very high (and the stabilization time of the ink in the pressure region is very short.

This results in a high injection frequency.

During the printing operation, the ink distribution path shown by the arrow in FIG. 1 is generated. child In this case, the ink flows out of a common ink container in the form of an ink bottle and reaches the receiver 10. It is then sent to the constricted portion 24 of the pressure regulating chamber 17 via the connecting member 28 . The ink is It reaches the nozzle port 27 from the pressure chamber 17 via the contraction passage (nozzle passage 20).

Illustrated embodiment of a sand inch ink head (in C, 24 nozzles is installed. To be precise, there are three nozzles each, corresponding to Figure 6. They are arranged in 8 rows. The vertical distance for each nozzle is adjusted according to the inclination of the individual nozzle rows. The separation 31 is different, thereby changing the print quality (resolution). child In this case, each nozzle may be arranged in a sandwich structure ink head in the arrangement shown. However, there are other ways to use sand-inch ink heads at an angle to the printing direction. Such an arrangement can also be achieved by attaching it to the holder.

FIG2 international search report international search report

Claims (1)

[Claims] 1. Each printing nozzle (27) is connected to one A multi-layered ink print head connected to two pressurized chambers (17); A slide plate (26), a pressurizing wall plate (16), and a drive element for the pressurizing chamber (17) are provided. In the ink print head comprising a diaphragm plate (14) with A plurality of plates (14, 16, 19 , 23, 26), the ink head has a sandwich structure and is configured as a separate π. and the plurality of plates are firmly joined to each other, in which case the sandwich structure One side of the structural ink head is constituted by the diaphragm plate (14). , and the other side of the ink head with the sanderch structure is connected to the nozzle plate (26). ), and further includes input to the ink head of the sandwich structure. A supply of ink (11) is provided with a receptacle for receiving the ink head of the sandwich structure. An ink print head with a multilayer structure, characterized in that printing is performed through a container (10). 2. The cavity (pressure chamber, interior) of the ink head of the sandwich structure that accommodates ink The main feature is that the nozzle passage (ink passage, nozzle passage) is composed of through holes in individual plates. The ink print head according to claim 1. 3. Both the nozzle passage (20) and the ink supply passage (21) of the pressurizing chamber (17) Similarly, perpendicularly and diametrically opposite said diaphragm plate (14). The unit according to claim 1 or 2, characterized in that the unit communicates with the inside of the pressurizing chamber (17). print head. 4. The pressurized chamber plate (16) is arranged on the side opposite to the diaphragm plate (14). , closed by one cover plate (19), which covers each pressurization amount. It is characterized by including a communication area between the nozzle passage and the ink supply passage. The ink print head according to claim 3. 5. A throttle passage (24) with an elongated cross section is provided, which is separate from the Claim characterized in that the aperture plate (23) of the body is arranged in the form of a slit. 5. The ink print head according to any one of 1 to 4. 6. The sandwich structure ink head uses a piezoelectric plate as a driving element. a diaphragm plate (14) having a body, a pressurized chamber plate (16), and a cover plate (19). , a diaphragm plate (23), and a nozzle plate (26). 5. The ink print head according to any one of 5. 7. Each printing nozzle (27) is connected to one a nozzle plate and a pressurization chamber plate (16) connected to two pressurization chambers (17); and a diaphragm plate (14) carrying a drive element for the pressurized chamber. In a method of manufacturing an ink printhead of a structure, In the first step of the method, all the plates are etched, stamped or electroformed. is manufactured as a molding material, and at that time, the pressurizing chamber (17) and the nozzle passage are (20) and the empty space in the ink print head that constitutes the throttle passage (24) are possible. As far as possible, the holes are formed as through holes in each of the plates (14, 16, 19, 23, 26). Next, each of the plates is mutually connected to form a sandwich structure ink head. In addition, the ink head of the sandwich structure is One side of the board is constituted by the diaphragm plate (14) and the sun The other side of the German structure ink head is constituted by a nozzle plate (26). and then the sandwich structure ink head is fixed on the receiving member. A method of manufacturing an ink print head having a multilayer structure, characterized in that: 8. The plates of the sandwich structure ink head are connected to each other by diffusion welding. 8. A method according to claim 7, characterized in that the method is joined to. 9. A claim characterized in that all the plates are made of nickel or chrome-nickel. The method according to claim 7 or 8. 10. Claim characterized in that at least each second plate is silver-plated The method according to item 8 or 9. 11. The sandwich structure ink head is configured as a multi-nozzle head. and has a plurality of parallel printing nozzles (27), and the printing nozzles are used for printing. Depending on the desired degree of resolution, the By rotating the sandwich structure ink head, it is possible to place it diagonally. The ink print head according to any one of claims 1 to 10, characterized in that: