CN211892477U - Direction-changeable ink drop deflection device and multi-nozzle spray head - Google Patents

Abstract

The utility model relates to an ink jet numbering machine shower nozzle technical field, more specifically relates to a but diversion ink droplet deflection arrangement and multiinjector shower nozzle, including the nozzle that sets gradually, fill electrode, phase sensor, electric field deflection district and accumulator, electric field deflection district is including relative first deflection board and the second deflection board that sets up, and first deflection board includes first electrode and second electrode, and first electrode and second electrode set up respectively in the both sides of advancing the china ink direction, and first electrode and second electrode access voltage variation in size, the same voltage output pole of polarity. A multi-nozzle spray head features that multiple deflecting ink drops are spliced together to make the deflecting direction of charged ink drops not fixed to the plane perpendicular to deflecting plate, i.e. the deflecting direction is variable, and the angle of deflection is just offset the inclination angle of longitudinal columns of ink dots generated by the time difference when ink drops fall on the object to be printed.

Description

Direction-changeable ink drop deflection device and multi-nozzle spray head

Technical Field

The utility model relates to an ink jet numbering machine shower nozzle technical field, more specifically relates to a but diversion ink droplet deflection arrangement and multiinjector shower nozzle.

Background

The code spraying machine is a device which is controlled by software and used for carrying out coding identification on products in a non-contact mode, and is widely applied to outer package spray printing identification of pipes, sectional materials, strips or other products.

When the ink jet printer is used for jet printing, the ink drops required to be used for jet printing are charged with charges with different heights one by one, the ink drops with different charge quantities can be deflected out of the spray head by different deflection quantities under the action of an electric field force and fall on the surface of a printed object to form a row of longitudinal ink dots, and character or pattern information is formed on the printed object by matching with the transverse movement of the printed object and the combination of the multiple rows of longitudinal ink dots.

Because the most reasonable charging mode of the prior art is: each column of longitudinal drops is charged one by one from low to high charge. The ink droplets in each column are ejected with small deflection amount firstly, then the ink droplets with large deflection amount are ejected, and because of the time difference of the ink droplets reaching the printed object and the transverse movement of the printed object, each column of longitudinal ink dots can show slight inclination on the printed object, namely the longitudinal columns of the ink dots are not vertical to the bottom edge of complete information, and the printed information shows the inclination phenomenon. The faster the object is conveyed, the more obvious the phenomenon is. Although the aesthetic quality of the printed information is not greatly affected in a single-nozzle application, the printed text is one-way slanted as shown in fig. 16.

However, in the multi-nozzle combined high-speed jet printing, especially in the application of the dual-nozzle jet printing, the aesthetic degree of the jet printing information will be seriously reduced, for example, when the dual-nozzle jet printing of the opposite deflection type is used for high-speed jet printing of the information, the upper half part of the information is jetted by one nozzle and jet printed in a deflection mode from top to bottom, and the lower half part of the information is jetted by the other nozzle and jet printed in a deflection mode from bottom to top, so that the upper half part of the ink dots of the information incline from the vertical column to one side and the lower half part of the ink dots incline from the vertical column to the other side, and each ink dot vertical column forming the complete information does not form a straight line from top to bottom but forms a shape, or when the printing object is in the opposite conveying direction, the ink dot vertical column forms a shape, and the dual-nozzle jet printing of the. As shown in fig. 15, if the dual-nozzle head prints two lines of characters at the same time, there will be two lines of characters with opposite inclination directions; as shown in fig. 17, if the dual nozzle heads print the same character at the same time, the upper and lower portions of the character may be inclined in opposite directions. The phenomenon is more serious the faster the printed object is conveyed, so that the aesthetic degree of the jet printing information is seriously influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a but diversion ink droplet deflector and multiinjector shower nozzle, the direction that makes electrified ink droplet deflect is not fixed at the plane of perpendicular to deflection board, it is variable to deflect the direction promptly, and make the angle that the direction that deflects change offset the ink dot vertical column inclination angle that the time difference that produces because of the ink droplet falls to the quilt printed matter just, thereby make the ink dot vertical column that different nozzles jet-printed out can even be the straight line, make the information that presents on the quilt printed matter more pleasing to the eye, accurate.

In order to solve the technical problem, the utility model discloses a technical scheme is: a direction-changeable ink drop deflection device comprises a nozzle, a charging electrode, a phase sensor, an electric field deflection area and a recovery tank which are sequentially arranged, wherein the electric field deflection area comprises a first deflection plate and a second deflection plate which are oppositely arranged, the first deflection plate comprises a first electrode and a second electrode, the first electrode and the second electrode are respectively arranged at two sides of an ink feeding direction, and the first electrode and the second electrode are connected to voltage output electrodes with different voltages and the same polarity.

In the device, a nozzle ejects ink drops, the ink drops carry charges after passing through a charging electrode, the ink drops are generally charged with negative charges at present, the ink drops carrying the negative charges enter an electric field deflection area, the electric field deflection area consists of a first deflection plate and a second deflection plate, two electrodes of the first deflection plate are respectively connected with two different positive voltage output electrodes, the second deflection plate is connected with a negative voltage output electrode, a high-voltage electric field is formed between the first deflection plate and the second deflection plate, and the charged ink drops deflect in the direction of high potential when entering the electric field deflection area, so that the charged ink drops are printed on the surface of a printed object, namely the ink drops deflect on a plane approximately vertical to the first deflection plate and the second deflection plate, and required characters are printed on the surface of the printed object by moving a conveying line of the printed object. In the device, because the voltages connected with the first electrode and the second electrode arranged on the first deflection plate are different in magnitude, therefore, in the electric field deflection area, the electric field intensity at two sides of the first deflection plate is different, the deflection direction of the charged ink drops is deviated to the side with higher electric field intensity, the ink drop trajectory surface is changed, in the process of jet printing, the offset direction of ink drops is changed to the moving direction of the printed object by adjusting the magnitude of the access voltage of the first electrode and the second electrode of the first deflection plate, the angle of the change just offsets the inclination angle of the longitudinal rows of the ink dots generated by the time difference of the ink drops falling on the printed object, so that the longitudinal rows of the ink dots are vertically sprayed and printed on the surface of the printed object to print vertical characters, especially in the multi-nozzle spray head, the characters sprayed and printed by each nozzle can be ensured not to incline, so that the vertical columns of ink dots sprayed and printed by different nozzles can be connected into a straight line. The information presented on the printed matter is more beautiful and accurate.

Furthermore, the first deflection plate further comprises a resistor body, and two sides of the resistor body are respectively connected with the first electrode and the second electrode. The resistor body is made of uniform weak conductive resistance materials, the working current is reduced, an electric field can be distributed on the whole working surface, the weak electric field area can be uniformly transited to the strong electric field area, and the deflection direction of ink drops can be stably controlled.

Furthermore, the resistor body is one or a combination of a plurality of weak conductive plastics, ceramics or resistive films.

Furthermore, the first electrode and the second electrode on both sides of the first deflection plate are connected with different voltages to realize different electric field intensities on both sides of the first deflection plate, and the voltage is adjusted according to the actual moving speed and direction of the conveying line of the printed object, so that the inclination of the vertical columns of ink dots generated by the time difference of ink droplets reaching the printed object is compensated and eliminated by the change of the deflection direction of the ink droplets.

Furthermore, both sides of the resistor body are respectively provided with an opening, and the first electrode and the second electrode are respectively inserted into the openings.

Furthermore, the first deflection plate further comprises an insulating bottom plate, the first electrode and the second electrode are respectively coated on the electrode layers at two ends of the insulating bottom plate, and the insulating bottom plate is further provided with a resistance layer which is respectively connected with the electrode layers at two ends.

Further, the first electrode is a first polar plate, the second electrode is a second polar plate, and the first polar plate and the second polar plate are arranged separately. The first polar plate and the second polar plate are separated by a certain effective distance to prevent the electric breakdown phenomenon.

Furthermore, the side surfaces of the first polar plate and the second polar plate which correspond to each other are inclined surfaces, so that the deflection electric field can be more evenly distributed or gradually distributed, the deflection electric field is not obviously split, and the deflection direction of the ink drop is stably controlled.

Furthermore, the first deflection plate is a positive electrode deflection plate, the second deflection plate is a negative electrode deflection plate, and a high-voltage electric field is formed between the positive electrode deflection plate and the negative electrode deflection plate.

A multi-nozzle spray head comprising the above-described deflectable drop deflection means;

the two second deflection plates are respectively arranged at two sides of the first deflection plate;

or the two first deflection plates are respectively arranged at two sides of the second deflection plate;

or a plurality of the direction-changeable ink drop deflection devices are spliced together side by side, and a plurality of first deflection plates and a plurality of second deflection plates are arranged oppositely.

Compared with the prior art, the beneficial effects of the utility model are that: the device can change the direction of the deflected ink drop, and the angle of the deflected direction can just offset the inclination angle of the longitudinal columns of ink dots generated by the time difference of the ink drop falling to the printed object, so that the longitudinal columns of ink dots jetted by different nozzles can be connected into a straight line, the information presented on the printed object is more beautiful and accurate, and particularly in the application of a multi-nozzle sprayer, the font jetted by each nozzle can not be inclined, and the longitudinal columns of ink dots jetted by different nozzles can be connected into a straight line.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a right side view of FIG. 1;

fig. 3 is a first schematic view of a first deflector plate according to an embodiment of the invention;

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a schematic front view of ink drop deflection;

FIG. 6 is a schematic diagram of a drop deflection side;

FIG. 7 is a schematic illustration of a change in direction of deflection of the ink drops of FIG. 6;

fig. 8 is a second schematic view of a primary deflector plate in accordance with an embodiment of the invention;

FIG. 9 is a right side view of FIG. 8;

FIG. 10 is a schematic diagram of the direction of deflection of an ink drop in the configuration of FIG. 9;

fig. 11 is a schematic structural view of a dual nozzle spray head according to an embodiment of the present invention;

fig. 12 is another schematic structural view of a dual nozzle spray head according to an embodiment of the present invention;

fig. 13 is a third schematic view of a first deflector plate in an embodiment of the invention;

fig. 14 is a schematic view of a fourth configuration of a first deflector plate in an embodiment of the invention;

FIG. 15 is a schematic diagram of a dual nozzle inkjet head for printing two lines of text at high speed according to the prior art;

FIG. 16 is a schematic diagram of a single nozzle tip of the prior art for printing a line of text at high speed;

FIG. 17 is a schematic diagram of a dual nozzle inkjet head for printing a line of text at high speed according to the prior art.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Example 1:

as shown in fig. 1 and 2, a direction-changeable ink droplet deflecting device includes a nozzle 3, a charge electrode 4, a phase sensor 5, an electric field deflecting region and a recovery tank 6 which are arranged in this order on a substrate 7, wherein the electric field deflection zone consists of a first deflection plate 1 and a second deflection plate 2, the first deflection plate 1 and the second deflection plate 2 are oppositely arranged, in this embodiment, the first deflection plate 1 is a positive electrode deflection plate, the second deflection plate 2 is a negative electrode deflection plate, and a high voltage electric field is formed between the positive electrode deflection plate and the negative deflection plate, as shown in fig. 5, y is the incidence direction of the ink droplets, S is the static ink line, i.e., the trajectory of uncharged drops in the electric field deflection zone, E the trajectory of charged drops in the electric field deflection zone, X the amount of charged drops deflected, as shown in fig. 6, and a the direction of drop deflection perpendicular to the working surface of the deflection plate. After entering the electric field deflection area, the charged ink drops are deflected out of the spray head by different deflection amounts and are printed on the surface of a printed object to form character or pattern information, and the uncharged ink drops are not deflected to the recovery tank 6 to be recovered.

In this embodiment, the first deflection plate 1 includes a first electrode 11 and a second electrode 12, specifically, the first electrode 11 and the second electrode 12 are respectively disposed on the left and right sides of the ink feeding direction, and the first electrode 11 and the second electrode 12 are respectively externally connected to positive voltage output electrodes with different voltages. The input voltages of the first electrode 11 and the second electrode 12 can be adjusted according to actual requirements, so that the electric field intensities at the two sides of the first deflection plate 1 are different, and the deflection directions and deflection amounts of the ink droplets are different.

In the present device, the nozzle 3 ejects ink drops, the ink drops are charged with different high and low negative charges after passing through the charging electrode 4, the ink drops with different charge quantities pass through the electric field deflection zone, the ink drops are deflected towards the A direction as shown in figure 7, leave the nozzle and land on the surface of the printed object, in addition, due to the different voltages applied to the first electrode 11 and the second electrode 12 on both sides of the first deflector plate 1, therefore, the electric field intensity on the first electrode 11 side is different from the electric field intensity on the second electrode 12 side, and the charged ink droplets are shifted to the side with higher electric field intensity, as shown in FIG. 7, if the conveying direction of the object is from left to right, when the high-speed jet printing is carried out, the connection voltage of the first electrode 11 is reduced, and the voltage of the second electrode 12 is increased, the left side of the electric field intensity of the electric field deflection area is weak, and the right side of the electric field intensity of the electric field deflection area is strong, and the direction of the resultant force of the electric field deviates to the right side towards the B direction. Similarly, when the object is printed at high speed from right to left in the conveying direction, the access voltage of the first electrode 11 is increased, the access voltage of the second electrode 12 is reduced, and the direction of the resultant force of the electric field is shifted to the left in the direction C, so that the inclination angle of the longitudinal ink dot array generated by the time difference when the ink drops fall on the object is offset by the changing angle of the deflection direction of the ink drops, the vertical ink dot array is printed on the surface of the object, and the vertical character is printed. In the multi-nozzle spray head, the characters sprayed and printed by each nozzle 3 can be ensured not to incline through the structure, so that the vertical columns of ink dots sprayed and printed by different nozzles 3 can be connected into a straight line. The information presented on the printed matter is more beautiful and accurate.

Particularly, when the jet printing speed is very slow and the influence of the jet printing on the conveying speed of the object to be printed is very small, the first electrode 11 and the second electrode 12 are connected to the same voltage, so that the electric field intensity on both sides of the first deflection plate 1 is the same, the deflection electric field is the uniform electric field, and the ink drop is deflected in the direction a.

In addition, the device can be used under the control of a computer when in use, and when the ink-jet printer works, the data obtained by the test experiment of the device or the data obtained by calculation which are pre-stored in the computer are used for applying corresponding voltage values to the first electrode 11 and the second electrode 12 according to the current jet printing speed and the current conveying direction of the object to be printed, so that the ink-jet printer hardly shows the inclination of the longitudinal rows of the ink dots within the maximum jet printing speed working range. And the ink-jet printer continuously adjusts and quickly responds according to the detected real-time speed and real-time direction of the printed object.

Specifically, as shown in fig. 3 and 4, the first deflection plate 1 further includes a resistor 10, wherein the resistor 10 is made of a material with low conductivity, specifically, one or more of a plastic, a ceramic or a resistive film with low conductivity, and two ends of the resistor 10 are respectively connected to the first electrode 11 and the second electrode 12. The resistor body 10 is made of a uniform weak conductive resistance material, so that an electric field can be distributed on the whole working surface while the working current is reduced, the transition from a weak electric field area to a strong electric field area can be uniform, and the deflection direction of ink drops can be stably controlled.

In particular, in practical applications, there is a way that ink droplets specially designed to be printed are positively charged, the repelling deflection plate of the electric field deflection region is connected to the positive voltage output electrode, and the attracting deflection plate is connected to the negative voltage output electrode. Although the two modes have opposite voltage polarities, the principle is the same, the function is the same, and the achieved effect is the same. For clarity and accuracy of description, it is stated herein that the ink droplets to be printed are negatively charged, and this does not mean that the present invention is only suitable for this mode.

Example 2:

this embodiment is similar to embodiment 1 except that, in this embodiment, as shown in fig. 13, the first deflection plate 1 further includes a resistor body 10, and a first electrode 11 and a second electrode 12 are provided at both ends of the resistor body 10, respectively. The first electrode 11 and the second electrode 12 are connected with different voltages to realize the difference of electric field intensity on two sides of the first deflection plate 1, and the voltage is adjusted according to the actual moving speed and direction of the conveying line of the printed object, so that the inclination of the vertical columns of ink dots generated by the time difference of ink droplets reaching the printed object is compensated and eliminated by the change of the deflection direction of the ink droplets.

The two ends of the resistor 10 are respectively provided with an opening, and the first electrode 11 and the second electrode 12 are respectively inserted into the openings. Specifically, the first electrode 11 and the second electrode 12 are embedded inside the resistor body on both sides.

Example 3:

this embodiment is similar to embodiment 1 or 2, except that, in this embodiment, as shown in fig. 14, the first deflection plate 1 further includes an insulating base plate 14, the first electrode 11 and the second electrode 12 are electrode layers 15 respectively coated on two ends of the insulating base plate 14, a resistive layer 16 is further disposed on the insulating base plate 14, and the resistive layer 16 is respectively connected to the electrode layers 15 on two ends.

Example 4:

this embodiment is similar to embodiment 1, 2 or 3, except that in this embodiment, as shown in fig. 8 and 9, the first electrode 11 is a first electrode plate 81, the second electrode 12 is a second electrode plate 82, the first electrode plate 81 and the second electrode plate 82 are separately disposed, and the side surfaces of the first electrode plate 81 and the second electrode plate 82 corresponding to each other are inclined surfaces. The first plate 81 and the second plate 82 are separated by an effective distance to prevent an electrical breakdown.

As shown in fig. 10, the width of the working surface of the first plate 81 is larger than that of the second plate 82 to cover the maximum value of the change in the direction of the ink droplet deflection in the B direction. So that ink drops deflected in the direction B are not disturbed. The first and second polar plates 81 and 82 together form a deflecting electric field with the negative electrode deflecting plate 2. The side surfaces of the first polar plate 81 and the second polar plate 82, which correspond to each other, are inclined surfaces, so that the deflection electric field tends to be distributed uniformly or gradually, and the deflection electric field is not split obviously, so that the deflection direction of the ink drop is controlled stably.

Example 5:

the present embodiment is similar to the above-mentioned embodiments, except that, in this embodiment, the present embodiment is an application example of the present device in a dual nozzle inkjet head of an opposite deflection type, as shown in fig. 11, a positive electrode deflection plate 111 installed on a substrate 7 is a positive electrode deflection plate shared by a first group of inkjet printing mechanisms and a second group of inkjet printing mechanisms, an upper surface and a lower surface of the positive electrode deflection plate are working surfaces, a first positive electrode 112 is connected to a first positive voltage output electrode, a second positive electrode 113 is connected to a second positive voltage output electrode, a first negative electrode deflection plate 114 of the first group of inkjet printing mechanisms and a second negative electrode deflection plate 115 of the second group of inkjet printing mechanisms are respectively disposed on two sides of the positive electrode deflection plate 111, and the first negative electrode deflection plate 114 and the second negative electrode deflection plate 115 are both. When the object to be printed is printed at high speed from left to right, the ink jet printer reduces the voltage of the first positive voltage output pole connected to the first positive electrode 112 and increases the voltage of the second positive voltage output pole connected to the second positive electrode 113, so that the ink drop deflection direction of the first group of ink jet printing mechanisms and the ink drop deflection direction of the second group of ink jet printing mechanisms are simultaneously changed towards the right side, and the vertical rows of ink dots simultaneously printed by the first group of ink jet printing mechanisms and the second group of ink jet printing mechanisms form a straight line. Similarly, when the object is printed at high speed from right to left, the inkjet printer increases the voltage of the first positive voltage output electrode connected to the first positive electrode 112, and decreases the voltage of the second positive voltage output electrode connected to the second positive electrode 113, so that the ink drop deflection direction of the first group of print mechanisms and the ink drop deflection direction of the second group of print mechanisms change to the left side at the same time, and the vertical columns of ink dots printed by the first group of print mechanisms and the second group of print mechanisms at the same time can form a straight line.

Example 6:

this embodiment is similar to embodiment 5, except that, this embodiment is an application example of the present apparatus to a double nozzle spray head of a reverse deflection type, as shown in fig. 12, a first positive electrode deflection plate 121 of the first group of inkjet printing mechanisms and a second positive electrode deflection plate 125 of the second group of inkjet printing mechanisms are respectively arranged on two sides of a common negative electrode deflection plate 124 of the first group of inkjet printing mechanisms and the second group of inkjet printing mechanisms, the first positive electrode deflection plate 121 is provided with a third positive electrode 122 and a fourth positive electrode 123, the second positive electrode deflection plate 125 is provided with a fifth positive electrode 126 and a sixth positive electrode 127, the third positive electrode 122 and the fifth positive electrode 126 are connected to a first positive voltage output electrode, the fourth positive electrode 123 and the sixth positive electrode 127 are connected to a second positive voltage output electrode, the charged ink droplets of the first group of jet printing mechanisms positioned at the upper part are deflected upwards, and the charged ink droplets of the second group of jet printing mechanisms positioned at the lower part are deflected downwards. In the jet printing, the transport direction and the jet printing speed of the object to be printed, and the voltage variation mode of the first positive voltage output electrode and the second positive voltage output electrode and the variation mode of the ink drop deflection direction are the same as those of the embodiment of the counter deflection type dual nozzle head of the embodiment 5, and the same advantageous effects are achieved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A direction-changeable ink drop deflection device comprises a nozzle (3), a charging electrode (4), a phase sensor (5), an electric field deflection area and a recovery tank (6) which are sequentially arranged, wherein the electric field deflection area comprises a first deflection plate (1) and a second deflection plate (2) which are oppositely arranged, the direction-changeable ink drop deflection device is characterized in that the first deflection plate (1) comprises a first electrode (11) and a second electrode (12), the first electrode (11) and the second electrode (12) are respectively arranged on two sides of an ink inlet direction, and the first electrode (11) and the second electrode (12) are connected with voltage output electrodes with different voltage and same polarity.

2. A deflectable drop deflection system as claimed in claim 1, wherein said first deflection plate (1) further comprises a resistive body (10), said resistive body (10) being connected at each end to said first electrode (11) and said second electrode (12).

3. A deflectable drop deflection apparatus as claimed in claim 2, wherein said resistive element (10) is one or more of a plastic, ceramic or resistive film.

4. A deflectable drop deflection system as claimed in claim 1, wherein said first deflection plate (1) further comprises a resistive body (10), said first electrode (11) and said second electrode (12) being disposed at respective ends of the resistive body (10).

5. A deflectable drop deflection apparatus as claimed in claim 4, wherein said resistive element (10) has openings at opposite ends thereof, and said first electrode (11) and said second electrode (12) are respectively inserted into said openings.

6. A deflectable drop deflection system as claimed in claim 1, wherein said first deflection plate (1) further comprises an insulating substrate (14), said first electrode (11) and said second electrode (12) are electrode layers (15) respectively coated on two ends of said insulating substrate (14), said insulating substrate (14) is further provided with a resistive layer (16), and said resistive layer (16) is connected to said electrode layers (15) respectively at two ends.

7. A switchable drop deflection device as claimed in claim 1, wherein the first electrode (11) is a first plate (81), the second electrode (12) is a second plate (82), and the first plate (81) and the second plate (82) are arranged separately.

8. A deflectable drop deflection system as claimed in claim 7, wherein said first plate (81) and said second plate (82) are beveled on opposite sides thereof.

9. A deflectable drop deflection device according to any of claims 1-8, wherein the first deflection plate (1) is a positive electrode deflection plate.

10. A multi-nozzle spray head comprising a steerable drop deflection device as claimed in any one of claims 1 to 9;

the two second deflection plates are respectively arranged at two sides of the first deflection plate;

or the two first deflection plates are respectively arranged at two sides of the second deflection plate;

or a plurality of the direction-changeable ink drop deflection devices are spliced together side by side to form the multi-nozzle spray head.

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