JPH04118238A - inkjet head - Google Patents

Abstract

PURPOSE:To reduce the cost of parts, make assembly easy and stabilize quality by forming electrodes in one piece at one terminal side of paired electrodes arranged at mutually opposite positions on both sides across an ink flow path. CONSTITUTION:Electrodes 3, 4 are made of a flat plate having the same thickness as a frame 1 and are arranged at mutually opposite positions across a gap. A gap between the both electrodes 3, 4 is formed as an ink flow path 5 running smoothly in an ink reservior groove 2. The electrode 4 of a negative pole side consists of all electrodes formed continuously in one piece from a side plate-like connection part 4a. All the electrodes 4 of the negative pole side are formed as a single part-like comb teeth. Further, an earth line is connected to the side plate-like connection part 4a. Electrically connection work such as soldering is performed only at one spot on the negative pole side electrode 4. For example, electrodes of the positive pole side can be formed in one piece by reversing the connections of the positive pole and the negative pole.

Description

[Detailed Description of the Invention] [Summary] With regard to inkjet heads used in inkjet printers, the purpose of this invention is to provide an inkjet head that has low component costs, is easy to assemble, and has stable quality. a plurality of ink channels provided in communication with nozzles opening toward the printing section; a magnetic flux generating means for generating magnetic flux crossing the ink channels; and a magnetic flux generated by the magnetic flux generating means. In the inkjet head, the plurality of pairs of electrodes are provided oppositely on both sides of each ink flow path in order to flow a current across the ink flow path in a direction perpendicular to the ink flow path. A plurality of electrodes on one pole side are integrally formed.

[Industrial application field]

The present invention relates to an inkjet head used in an inkjet printer.

In order to obtain high-speed and excellent printing quality, magnetic flux and current are passed orthogonally through the conductive ink in the ink flow path, and the force generated in the conductive ink moves the conductive ink from the nozzle toward the printing area. There is an inkjet head that ejects ink.

[Conventional technology]

When using an inkjet head in a printer, it is necessary to arrange a plurality of nozzles (for example, 12) toward a printing section. Then, it is necessary to provide an electrode for each ink flow path across the flow path so that a current can be independently applied to the conductive ink directed toward each nozzle.

Conventionally, such an electrode has both a positive electrode side and a negative electrode side,
It was provided independently for each ink flow path.

[Problem to be solved by the invention]

As mentioned above, in conventional inkjet heads, the electrodes on both sides of the positive and negative electrodes were provided independently for each ink flow path, which resulted in a large number of parts and high parts costs. .

In addition, assembly is complicated, as it is necessary to perform electrical connection (soldering) work for each electrode, which increases assembly costs and tends to result in unstable quality.

It is an object of the present invention to provide an inkjet head that eliminates such conventional drawbacks, has low component costs, is easy to assemble, and has stable quality.

[Means to solve the problem]

In order to achieve the above object, the inkjet head of the present invention has conductive ink passed through the nozzle 5a that opens toward the printing section, as shown in FIG. a plurality of ink flow paths 5 provided in communication with each other, a magnetic flux generation means 10.11 for generating magnetic flux crossing the ink flow paths 5, and the magnetic flux generation means 10,
1. A plurality of pairs of electrodes 3 provided oppositely on both sides of each ink flow path 5 in order to flow a current across the ink flow path 5 in a direction perpendicular to the magnetic flux generated by 1.1; 4 is characterized in that the plurality of electrodes 4 on one pole side of the plurality of pairs of electrodes 3 and 4 are integrally formed.

Note that all of the electrodes 4 on the one pole side may be integrally formed, or even if some of the plurality of electrodes of the electrodes 4 on the one pole side are integrally formed. good.

[Effect]

Among the plurality of pairs of electrodes 3 and 4, a plurality of electrodes 4 on one pole side
Since the electrodes 4 are integrally formed, there is no need to attach an electrode to each ink flow path 5 on the pole side, and the integrally formed electrodes 4 can be attached all at once.

〔Example〕

Examples will be described with reference to the drawings.

FIG. 2 is a perspective view of the embodiment, FIG. 1 is a sectional view thereof, and FIG. 3 is an exploded perspective view.

In the figure, ■ is a flat frame in which an ink reservoir groove 2 for storing conductive liquid ink is formed, and it is made of an electrically insulating non-magnetic material such as a plastic plate. has been done.

Electrodes 3 and 4 made of a conductive but non-magnetic material, such as stainless steel, are provided on the front end side of the frame l.

The electrodes 3 and 4 are plate-shaped and have the same thickness as the frame 1, and are arranged to face each other with a gap between them. and,
A gap between the picture electrodes 3 and 4 is formed as an ink flow path 5 that smoothly passes through the ink reservoir groove 2.

The tip side of each ink flow path 5 is formed narrower than the ink reservoir groove 2, and the tip becomes a nozzle 5a that opens toward the printing section.

A plurality (for example, 12) of the frames 1 as described above are arranged in parallel with slight intervals.

Note that FIG. 1 shows a small number of components and is omitted from the illustration, and FIG. 3 shows an intermediate portion thereof that is omitted from the illustration. Electrodes 3 and 4 are provided on the tip side of each frame l, respectively.

A rectangular partition plate 7 made of an electrically insulating non-magnetic material such as a plastic plate is sandwiched between each flat plate formed by the frame l and the electrodes 3 and 4. The ink channels 5 are connected together to separate adjacent ink channels 5.

However, a communication hole 7 is provided at the rear of the partition plate 7 in alignment with the round groove 2a formed at the rear end of the ink reservoir groove 2.
A is drilled. Therefore, all the ink reservoir grooves 2 communicate with each other via the communication holes 7a. In addition, the third
In the figure, only one partition plate 7 is shown, and illustration of the other partition plates is omitted.

Reference numerals 8 and 9 denote a top lid and a bottom lid that are joined to close the top and bottom surfaces of the ink reservoir groove 2 and the ink flow path 5.

Permanent magnets 10.11 are attached to the top and bottom of the electrode 3.4 (that is, the ink flow path 5) with their magnetic poles aligned in the same direction. However, its illustration is omitted in FIG. Note that an electromagnet may be used instead of a permanent magnet.

The magnetic flux formed between the two permanent magnets 10.11 crosses the ink flow path 5. When the electrodes 3 and 4 are connected to a power source, a current flows across the ink channel 5 into the conductive ink in the ink channel 5 in a direction perpendicular to the magnetic flux.

As a result, a force according to Fleming's left-hand rule is applied to the conductive ink in the ink flow path 5, and the conductive ink is ejected from the nozzle 5a toward the printing section.

In order to be able to independently control such ejection operation for each segment (ink flow path 5), each of the positive electrodes 3 is provided independently. and is connected to the drive circuit 12.

The operation of the drive circuit 12 is controlled by a control signal sent from a print control section (not shown), and a predetermined voltage (+eV) is applied to the positive electrode 3 at a designated position.

On the other hand, all of the electrodes 4 on the negative electrode side are integrally connected from a side plate-shaped connecting portion 4a. Therefore, all the electrodes 4 on the negative electrode side are formed as one piece in the shape of a comb. A ground wire is connected to the side plate-shaped connecting portion 4a.

Therefore, electrical connection work such as soldering to the negative electrode 4 only needs to be performed at one location.

Note that the present invention is not limited to the above embodiments,
For example, the connection between the positive electrode and the negative electrode may be reversed, and the plurality of electrodes on the positive electrode side may be integrally formed.

Moreover, it is not necessarily necessary to integrally form all the electrodes on one pole side as one part, and some of the plurality of electrodes on one pole side may be integrally formed as one part.

〔Effect of the invention〕

According to the inkjet head of the present invention, since the plurality of electrodes on one pole side are integrally formed, the number of parts is significantly reduced and the cost of parts is reduced, and soldering for electrical connection is a labor-intensive task. Since the number of parts, etc., is significantly reduced, assembly costs are also reduced, and at the same time, product quality is stabilized and reliability is improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the embodiment, FIG. 2 is a perspective view of the embodiment; FIG. 3 is an exploded perspective view of the embodiment. In the figure, 3-・electrode, 4--electrode, 5... Ink flow path, 10... Permanent magnet (magnetic flux generation means) 11.--Permanent magnet (magnetic flux generation means) PLF 1st page of example Between the front faces #-1 view of actual sales example Figure 2 Exploded paulownia view of large proportion Figure 3

Claims (1)

[Scope of Claims] 1. A plurality of ink channels (5) through which conductive ink passes and which are provided in communication with nozzles (5a) that open toward the printing section; 5) magnetic flux generating means (10, 11) for generating magnetic flux across said ink flow path (5); and a current flowing across said ink flow path (5) in a direction perpendicular to the magnetic flux generated by said magnetic flux generating means (10, 11). In the inkjet head, the plurality of pairs of electrodes (3, 4) are provided oppositely on both sides of each of the ink channels (5) to flow the ink. An inkjet head characterized in that a plurality of electrodes (4) on one pole side are integrally formed. 2. The inkjet head according to claim 1, wherein all of the electrodes (4) on the one pole side are integrally formed. 3. The inkjet head according to claim 1, wherein some of the electrodes (4) on the one pole side are integrally formed.