CN111114131B - Double-nozzle spray head structure capable of deflecting reversely - Google Patents

Abstract

The present invention discloses a double-nozzle nozzle structure with reverse deflection, which is provided with two groups of inkjet mechanisms, and the two groups of inkjet mechanisms are provided with a deflection plate group; the deflection plate group includes a positive deflection plate and a negative deflection plate; the positive deflection plate is fixed on the base of the positive deflection plate; an annular permanent magnet is installed at the nozzle bottom plate position corresponding to the base of the positive deflection plate; an electromagnetic coil fixed to the back of the base of the positive deflection plate is provided in the annular gap formed by the annular permanent magnet and its circular magnetic yoke; when the electromagnetic coil is connected to the current, the relative position of the positive deflection plate and the negative deflection plate changes according to the positive and negative or/and size of the current. The present invention uses a movable positive deflection plate to change the position of the positive deflection plate relative to the negative deflection plate during printing, and solves the problem of pattern deformation caused by changes in printing speed. At the same time, in order to make the splicing of the two nozzle printing areas more synchronous, the spacing of the front and rear staggered arrangement of the nozzles is set to be smaller.

Description

A double-nozzle spray head structure with reverse deflection

Technical Field

The invention relates to the field of inkjet printers, and in particular to a reversely deflected double-nozzle spray head structure.

Background Art

The inkjet printer is a high-tech product that uses charged ink droplets. When passing through a high-voltage electric field, the electric field force deflects the ink droplets out of the nozzle and hits the surface of an object, moving with the substrate to form patterns or text on the substrate.

According to the working principle of the inkjet printer, the more lines a single nozzle prints (the more vertical dot matrixes), the lower the printing speed and quality will be. In order to achieve high-speed, high-quality, and wide-format printing, dual-nozzle inkjet printers have emerged. However, dual-nozzle inkjet printers will have problems such as splitting, overlapping, and misalignment of the pattern splicing area. Also due to the working principle of the inkjet printer, there is a time difference between the first deflected ink droplet to the maximum deflected ink droplet in each longitudinal column during printing. The faster the substrate moves, the more inclined the printed pattern will be. In the application of a single-nozzle inkjet printer, this problem can be solved by manually adjusting the axial installation angle of the nozzle or adjusting the relative position of the deflection plate, as shown in Figures 4A, 4B, and 4C. However, a dual-nozzle inkjet printer cannot directly solve this problem in the same way as a single-nozzle inkjet printer. The current dual-nozzle inkjet printer structures can be divided into four types, as shown in Figures 5A, 5B, 5C, and 5D:

Figure 5A shows the opposite deflection mode. If the distance between the printing surface and the nozzle is jittery, there will be serious overlap or splitting of the splicing area. In addition, the faster the speed, the more serious the angle formed by the patterns printed by the two nozzles will be tilted in opposite directions. The specific structure can be referred to in CN202242328, a high-speed dual-nozzle nozzle for non-contact inkjet printer.

Figure 5B shows the same-direction deflection mode. If the distance between the printing surface and the nozzle is jittery, the splicing area will overlap or split. In addition, the faster the speed, the more the patterns printed by the two nozzles are tilted in the same direction, and the more serious the misalignment. The specific structure can be referred to the double-nozzle nozzle of the CN201693837 inkjet printer.

FIG5C shows a reverse deflection mode in which the two nozzles are bilaterally symmetrical and form an angle. Because the printed ink dots need to cover the downward projection area of the recovery tank, the angle between the two nozzles cannot be too small, which makes it unsuitable for all nozzle types. Some nozzle types will have slight overlap or splitting in the splicing area. In addition, the faster the speed, the more serious the angle formed by the patterns printed by the two nozzles in the opposite direction. For the specific structure, please refer to CN209616671, a double nozzle inkjet printer nozzle structure.

FIG5D is a reverse deflection mode of double nozzles being misaligned left and right. Since there is a large distance between the two nozzles in the direction of movement of the substrate, when the speed of the production line changes drastically, the joint area of the two nozzles is easily misaligned. In addition, the faster the speed, the more serious the angle formed by the patterns printed by the two nozzles in the opposite directions. For the specific structure, please refer to CN208789278, a double nozzle structure of a printer.

Summary of the invention

In view of the problems existing in the prior art, the present invention provides a double-nozzle spray head structure with reverse deflection.

To achieve the above objectives, the present invention is implemented through the following technical solutions:

A double-nozzle spray head structure with reverse deflection, wherein two groups of inkjet mechanisms are arranged in the spray head, and both groups of inkjet mechanisms are provided with a deflection plate group;

The deflection plate group includes a positive deflection plate and a negative deflection plate; the positive deflection plates corresponding to the two inkjet mechanisms are respectively fixed on both sides of the positive deflection plate base; the two inkjet mechanisms use the same negative deflection plate; the negative deflection plate is provided with two arc-shaped areas in opposite directions, corresponding to different positive deflection plates;

An annular permanent magnet, an annular yoke and a circular yoke are fixedly installed at the nozzle bottom plate position corresponding to the positive deflection plate base; an electromagnetic coil fixed to the back of the positive deflection plate base is arranged in the annular gap formed by the annular permanent magnet and its circular yoke;

When the electromagnetic coil is connected to current, the relative positions of the positive deflection plate and the negative deflection plate are changed according to the positive or negative and/or magnitude of the current.

Preferably, the two groups of inkjet mechanisms are installed on the nozzle base plate with a height difference, and their projections on the nozzle base plate are parallel to each other, and the two groups are perpendicular to the printing surface at the same time; the height difference between the two groups of inkjet mechanisms corresponds to the height difference between the center points corresponding to the two arc-shaped areas in the negative deflection plate.

Preferably, the two groups of inkjet mechanisms are installed on the nozzle base plate with a height difference, and their projections on the nozzle base plate form an angle, and the intersection point falls on the projection surface of the negative deflection plate on the nozzle base plate; the height difference between the two groups of inkjet mechanisms corresponds to the height difference between the center points corresponding to the two arc-shaped areas in the negative deflection plate.

Further preferably, the two groups of inkjet mechanisms are independently provided with a nozzle gun body, a nozzle, a charging slot, a phase sensor and a recovery slot in sequence; the deflection plate group is arranged between the phase sensor and the recovery slot.

More preferably, an isolation plate is provided between the charging slots and phase sensors of each of the two groups of inkjet mechanisms.

Preferably, the positive electrode deflection plate base is mounted on the nozzle base plate via a spring sheet.

Preferably, the gap between the positive electrode deflection plate base and the nozzle bottom plate is sealed by a sealing component.

Preferably, two positive deflection plates are mounted on the positive deflection plate base with a height difference, and the height difference corresponds to the height difference between the center points corresponding to the two arc-shaped areas in the negative deflection plate.

The present invention uses a movable positive deflection plate to change the position of the positive deflection plate relative to the negative deflection plate during printing, thereby solving the problem of pattern deformation caused by changes in printing speed. At the same time, in order to make the splicing of the two nozzle printing areas more synchronous, the spacing of the front and rear staggered arrangement of the nozzles is set to be smaller.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1A is a schematic diagram of a first structure of the present invention;

FIG1B is a front view of FIG1A ;

FIG2A is a schematic diagram of a second structure of the present invention;

FIG2B is a front view of FIG2A ;

3A and 3B are schematic diagrams of printing effects of the present invention;

Figures 4A, 4B, and 4C are schematic diagrams of printing effects of a single nozzle inkjet printer;

5A, 5B, 5C, and 5D are schematic diagrams of the structure of a current dual-nozzle inkjet printer.

In the figure: the nozzle base plate 1; the first group of nozzle gun bodies 11; the second group of nozzle gun bodies 12; the first group of nozzles 21; the second group of nozzles 22; the charging slot 2; the phase sensor 3; the positive deflection plate 30; the first positive deflection plate 31; the second positive deflection plate 32; the negative deflection plate 33; the isolation plate 34; the first recovery slot 4; the second recovery slot 5; the positive deflection plate base 6; the negative deflection plate upper support column 71; the negative deflection plate lower support column 72; the spring sheet 8; the electromagnetic coil 91; the annular permanent magnet 92; the circular yoke 93; the annular yoke 94; the sealing component 95.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In order to eliminate the influence of the distance change from the printing surface on the splicing quality and to be applicable to all types of nozzle apertures, the reverse deflection dual-nozzle printhead has two nozzles parallel and perpendicular to the printing surface (nozzles are arranged in an offset manner/parallel), or at a smaller angle (the two nozzles are at an angle, and the first deflected ink dots of the two nozzles are parallel to each other and perpendicular to the printing surface); in order to make the splicing of the two nozzle printing areas more synchronous when applied to a production line with a faster change rate, the time delay of the two nozzles printing the same column (longitudinal) of ink dots must be shorter, that is, the spacing between the front and rear offset arrangements of the nozzles must be smaller, so the shape of the negative deflection plate shared by the two nozzles has an "S"-shaped cross-section, and at the initial position of the ink dot deflection area of each nozzle, the arc-shaped deflection working surface is symmetrical up and down.

Specifically, the present invention includes two different structures to achieve the same function, wherein the first structure is shown in FIGS. 1A and 1B , in which the left and right double nozzles are offset up and down relative to the bottom plate of the nozzle and are parallel on the projection plane and perpendicular to the printing surface; the second structure is shown in FIGS. 2A and 2B , in which the left and right double nozzles are offset up and down relative to the bottom plate of the nozzle and form an angle on the projection plane, so that the first deflected ink dots of the left and right double nozzles are perpendicular to the printing surface.

The first structure:

As shown in FIG. 1A and FIG. 1B , the two inkjet mechanisms include a first group of nozzle gun bodies 11 and a second group of nozzle gun bodies 12 mounted on a nozzle base plate 1 , as well as independently arranged nozzles, charging slots 2 , phase sensors 3 , deflection plate groups and recovery slots.

Taking the first group of inkjet mechanisms as an example for detailed description, a first group of nozzle gun bodies 11, a first group of nozzles 21, a charging tank 2, a phase sensor 3, and a first recovery tank 4 are sequentially arranged.

The area between the phase sensor 3 and the first recovery slot 4 is the deflection zone, in which a deflection plate group realizing corresponding functions is installed. The negative deflection plate 33 in the deflection plate group is fixed on the nozzle bottom plate 1 at both ends through the negative deflection plate upper support column 71 and the negative deflection plate lower support column 72 respectively. The shape of the negative deflection plate 33 is shown in FIG1B , and the two groups of nozzles share a negative deflection plate 33, and the cross section of the negative deflection plate 33 is "S" shaped, and the upper and lower arc-shaped areas are symmetrical in center and each corresponds to a positive deflection plate 30, and at the initial position of the ink dot deflection zone of each nozzle, the arc-shaped deflection working surface is symmetrical up and down; the center of the arc points to the position corresponding to the positive deflection plate 30.

The positive deflection plate 30 is fixed in the movable positive deflection plate base 6. The positive deflection plate base 6 corresponds to the nozzle bottom plate position and is fixedly installed with an annular permanent magnet 92, the magnetic poles of which face the upper and lower end surfaces, an annular yoke 94 and a circular yoke 93. The annular gap between the annular permanent magnet 92 and its circular yoke 93 is provided with an electromagnetic coil 91 fixed to the back of the positive deflection plate base 6, and is sealed by a sealing component 95. The positive deflection plate base 6 is fixed to the nozzle bottom plate 1 by a spring sheet 8 at the edge. The spring sheet 8 is elastic, so that the positive deflection plate base 6 will be offset when subjected to magnetic force.

The structure of the second inkjet mechanism is similar to that of the first inkjet mechanism, and they share a positive deflection plate base 6, and also have an independent second nozzle gun body 12, a second nozzle 22, a charging tank, a phase sensor, and a second recovery tank 5 that are arranged in sequence. The charging tanks and phase sensors in the two inkjet mechanisms are separated from each other by an isolation plate 34.

The first positive deflection plate 31 and the second positive deflection plate 32 corresponding to the first group of nozzle gun bodies 11 and the second group of nozzle gun bodies 12 are arranged on both sides of the positive deflection plate base 6, and the first deflection electric field area and the second deflection electric field area are formed by the opposite arc areas corresponding to the same negative deflection plate 33.

The relative positions of the first group of nozzle gun bodies 11 and the second group of nozzle gun bodies 12 are shown in Figures 1A and 1B; the first group of nozzle gun bodies 11 and the second group of nozzle gun bodies 12 are installed on the nozzle base plate with a height difference, and their projections on the nozzle base plate 1 are parallel. Due to the height difference, the first positive deflection plate 31 and the second positive deflection plate 32 installed on the same positive deflection plate base 6 also have a height difference, and the difference between the two height differences is the same, which is also the same as the difference in height between the center points of the two arc-shaped areas in the negative deflection plate 33.

The second structure:

The part related to the positive deflection plate 30 of the second structure is similar to that of the first structure, except that the two groups of inkjet mechanisms are offset up and down relative to the base plate and form an angle on the projection surface; as shown in Figures 2A and 2B; the first group of inkjet mechanisms are sequentially provided with a first group of nozzle gun bodies 11, a first group of nozzles 21, a charging slot 2, a phase sensor 3, and a first recovery slot 4; the second group of inkjet mechanisms are sequentially provided with a second group of nozzle gun bodies 12, a second group of nozzles 22, a charging slot, a phase sensor, and a second recovery slot 5; the corresponding projection straight lines of the two groups of inkjet mechanisms on the nozzle base plate 1 intersect with each other, and the projection of the intersection falls on the projection surface of the negative deflection plate 33 on the nozzle base plate 1.

Similarly, the two inkjet mechanisms also share a negative deflection plate 33, the cross-section of the negative deflection plate 33 is S-shaped, with two upper and lower arc-shaped areas in opposite directions, the center of the arc points to the position corresponding to the positive deflection plate 30.

At the same time, the first group of nozzles 21 and the second group of nozzles 22 also have a corresponding height difference, which is the same as the height difference between the corresponding first positive deflection plate 31 and the second positive deflection plate 32, and is also the same as the height difference between the center points of the two arc-shaped areas of the same corresponding negative deflection plate 33.

When the two ends of the electromagnetic coil 91 are connected to a forward current, the electromagnetic coil 91 and the positive deflection plate base 6 move outward. Conversely, when the electromagnetic coil 91 is connected to a reverse current, the positive deflection plate base 6 moves inward. The greater the current, that is, the higher the connected voltage, the greater the movement. Its operating principle is equivalent to that of a "moving coil electromagnetic speaker". During operation, according to the current printing direction and printing speed, the corresponding voltage polarity and voltage value are connected to the two ends of the coil, and adjusted in real time to eliminate the problem of the patterns printed by the two nozzles being tilted in opposite directions to form an angle, as shown in Figures 3A and 3B.

Regarding other parts of the inkjet printer that have not been modified, reference may be made to the relevant literature records of the prior art to understand the corresponding structures or necessary equipment that have not been improved.

The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims (6)

1. A double-nozzle printhead structure with reverse deflection, characterized in that: two groups of inkjet mechanisms are arranged in the printhead, and both groups of inkjet mechanisms are provided with a deflection plate group; The deflection plate group includes a positive deflection plate and a negative deflection plate; the positive deflection plates corresponding to the two inkjet mechanisms are respectively fixed on both sides of the positive deflection plate base; the two inkjet mechanisms use the same negative deflection plate; the negative deflection plate is provided with two arc-shaped areas in opposite directions, corresponding to different positive deflection plates; An annular permanent magnet, an annular yoke and a circular yoke are fixedly installed at the nozzle bottom plate position corresponding to the positive deflection plate base; an electromagnetic coil fixed to the back of the positive deflection plate base is arranged in the annular gap formed by the annular permanent magnet and its circular yoke; When the electromagnetic coil is connected to the current, the relative positions of the positive deflection plate and the negative deflection plate change according to the positive or negative and/or size of the current. The two groups of inkjet mechanisms are installed on the nozzle base plate with a height difference, and their projections on the nozzle base plate are parallel to each other, and the two groups are perpendicular to the printing surface at the same time; the height difference between the two groups of inkjet mechanisms corresponds to the height difference between the center points corresponding to the two arc-shaped areas in the negative deflection plate. The two groups of inkjet mechanisms are installed on the nozzle base plate with a height difference, and their projections on the nozzle base plate form an angle, and the intersection point falls on the projection surface of the negative deflection plate on the nozzle base plate; the height difference between the two groups of inkjet mechanisms corresponds to the height difference between the center points corresponding to the two arc-shaped areas in the negative deflection plate. 2. According to the reverse deflection dual-nozzle printhead structure described in claim 1, it is characterized in that: the two groups of inkjet mechanisms are independently provided with a nozzle gun body, a nozzle, a charging slot, a phase sensor and a recovery slot in sequence; the deflection plate group is arranged between the phase sensor and the recovery slot. 3. The reverse deflection dual-nozzle printhead structure according to claim 2 is characterized in that an isolation plate is provided between the charging slots and phase sensors of each of the two groups of inkjet mechanisms. 4. The reverse deflection dual-nozzle spray head structure according to claim 1 is characterized in that the positive deflection plate base is installed on the spray head bottom plate through a spring sheet. 5. The reverse deflection dual-nozzle spray head structure according to claim 1 is characterized in that the gap between the positive deflection plate base and the spray head bottom plate is sealed by a sealing component. 6. The reverse deflection dual-nozzle spray head structure according to claim 1 is characterized in that two positive deflection plates are installed on the positive deflection plate base with a height difference, and the height difference corresponds to the height difference of the center points corresponding to the two arc-shaped areas in the negative deflection plate.