Printhead having at least two ejection faces, printing apparatus and printing device

Abstract

The utility model relates to a printing head with at least two jet surfaces, a printing device and a printing equipment, the printing head includes printing head body, it includes cavity, the liquid inlet that communicates with the cavity, printing head body is equipped with first jet surface and second jet surface, and first jet surface and second jet surface are located the different side of printing head body, first jet surface is equipped with the first orifice that communicates with the cavity and is close to the first orifice and sets up the first actuator, and first actuator is located the outer surface of first jet surface and is configured to make the liquid in the cavity from first orifice and spray, second jet surface is equipped with the second orifice that communicates with the cavity and is close to the second orifice and sets up the second actuator, and second actuator is located the outer surface of second jet surface and is configured to make the liquid in the cavity from second orifice and spray. Can take into account reducing printing head manufacturing cost and design complexity, realizes at least two jet surfaces stable and reliable jet droplet, simplifies the maintenance and assembly of printing head.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a print head, printing device, and printing equipment having at least two spray surfaces. Background Technology

[0002] Existing printheads typically have only one ejection surface with nozzles. An actuator is located in an independent pressure chamber inside the printhead for internal drive. The actuator's operation causes ink to be ejected from the nozzles. Typically, a printhead can only print on one side of the substrate at a time, resulting in low printing efficiency. Even attempts to incorporate two ejection surfaces on different sides of the printhead face difficulties due to the complex flow channel arrangement inside the printhead and the precision required for actuator size and structure, making it challenging to rationally arrange the actuators within the flow channels. Utility Model Content

[0003] This invention addresses the problems existing in the prior art by providing a printhead, printing device, and printing equipment with at least two spray surfaces, which can balance reducing printhead cost and design complexity, achieve printing with at least two spray surfaces, and reduce printhead maintenance costs.

[0004] In a first aspect, the present invention provides a printhead, comprising a printhead body including a cavity and a liquid inlet communicating with the cavity. The printhead body is provided with a first spray surface and a second spray surface, the first spray surface and the second spray surface being located on different sides of the printhead body. The first spray surface is provided with a first nozzle communicating with the cavity and a first actuator disposed near the first nozzle. The first actuator is located on the outer surface of the first spray surface and is configured to cause liquid in the cavity to be ejected from the first nozzle. The second spray surface is provided with a second nozzle communicating with the cavity and a second actuator disposed near the second nozzle. The second actuator is located on the outer surface of the second spray surface and is configured to cause liquid in the cavity to be ejected from the second nozzle.

[0005] In one embodiment, the first spray surface and the second spray surface are arranged opposite to each other.

[0006] In one embodiment, the first spray surface and the second spray surface are symmetrical about a first plane, which is a plane parallel to the central axis of the inlet and passing through the center point of the inlet end face; the cavity includes two first cavity walls symmetrically arranged about the first plane; the distance between the two first cavity walls gradually increases in the direction along the central axis of the inlet and away from the inlet, and the end faces of the two first cavity walls away from the inlet are respectively connected to the first spray surface and the second spray surface.

[0007] In one embodiment, the cross-sectional shape of the cavity is symmetrical about the central axis of the liquid inlet, and the first spray surface and the second spray surface are symmetrical about the central axis of the liquid inlet.

[0008] In one embodiment, the cavity is provided with a flow guide that is positioned opposite to the liquid inlet, and the flow guide is located between the first spray hole and the second spray hole.

[0009] In one embodiment, the first actuator includes a droplet-forming transducer disposed around the first nozzle and a droplet-forming waveform source that provides a waveform to the droplet-forming transducer.

[0010] In one embodiment, the first actuator and the second actuator are configured to operate continuously at a preset frequency so that the liquid jets ejected from the first nozzle and the second nozzle are split into droplet sequences, respectively.

[0011] Secondly, the present invention also provides a printing device, including a mounting component and at least one print head as described above mounted on the mounting component.

[0012] In addition to the printhead and printing apparatus described above, this utility model also provides a printing device, comprising: the printing apparatus as described above; a substrate conveying mechanism configured to convey a substrate to be printed, the substrate conveying mechanism being at least partially disposed around the printhead, the conveying mechanism including a first conveying section, a second conveying section, and an intermediate conveying section connecting the first conveying section and the second conveying section, the first conveying section being configured to have the front side of the substrate facing the first spray surface, and the second conveying section being configured to have the back side of the substrate facing the second spray surface.

[0013] In one implementation, the intermediate conveying section is equipped with a drying device.

[0014] This utility model also provides another printing device, including: at least one printing device as described above; a first conveying mechanism configured to convey a first substrate to be printed, the first conveying mechanism including a first conveying section configured to face the reverse or front side of the first spraying surface; and a second conveying mechanism configured to convey a second substrate to be printed, the second conveying mechanism including a second conveying section configured to face the reverse or front side of the second substrate to the second spraying surface.

[0015] In one embodiment, the printing apparatus includes: two printing devices as described above, spaced apart, and two printheads, which are respectively a first printhead and a second printhead; the first conveying mechanism further includes a third conveying section and a first intermediate conveying section connecting the first conveying section and the third conveying section, the first conveying section being configured such that the reverse side of a first substrate faces the first ejection surface of the first printhead, and the third conveying section being configured such that the front side of the first substrate faces the second ejection surface of the second printhead; the second conveying mechanism includes a fourth conveying section and a second intermediate conveying section connecting the second conveying section and the fourth conveying section, the second conveying section being configured such that the reverse side of a second substrate faces the first ejection surface of the first printhead, and the fourth conveying section being configured such that the front side of the second substrate faces the second ejection surface of the second printhead.

[0016] Thirdly, the present invention also provides a printing device, comprising: the printing apparatus as described above; a first driving mechanism configured to drive a substrate to be printed to move relative to the print head; or, a second driving mechanism connected to the print head and configured to drive the print head to move relative to the substrate; or, a first driving mechanism configured to drive a substrate to be printed to move relative to the print head; and a second driving mechanism connected to the print head and configured to drive the print head to move relative to the substrate.

[0017] Compared with the prior art, this utility model has the following advantages: The present invention provides a printhead with at least two spray surfaces. The first nozzle of the first spray surface and the second nozzle of the second spray surface share a cavity, which can reduce the manufacturing cost and design complexity of the printhead. At the same time, the first actuator is set on the outer surface of the first spray surface and the second actuator is set on the outer surface of the second spray surface, which facilitates maintenance and assembly and enables stable and reliable spraying of droplets from at least two spray surfaces. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a printhead having at least two spraying surfaces according to an embodiment of the present invention. Figure 2 yes Figure 1 The front view; Figure 3 yes Figure 2 A cross-sectional view along the AA direction; Figure 4 yes Figure 2 Enlarged structural diagram of section B in the middle; Figure 5 yes Figure 1 Top view; Figure 6 yes Figure 5 A sectional view along the CC direction; Figure 7 A cross-sectional view of another printhead according to an embodiment of this utility model; Figure 8 This is a cross-sectional view of another printhead according to an embodiment of the present utility model; Figure 9 This is a cross-sectional view of another printhead according to an embodiment of the present utility model; Figure 10 This is a schematic diagram of the printing device according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the first printing device according to an embodiment of the present utility model; Figure 12 This is a schematic diagram of the structure of a second type of printing device according to an embodiment of the present utility model; Figure 13 This is a schematic diagram of the structure of a third type of printing device according to an embodiment of this utility model; Figure 14 This is a schematic diagram of the structure of the fourth type of printing device according to an embodiment of this utility model.

[0019] In the attached figures: printhead 100; first printhead 100A; second printhead 100B; printhead body 1; cavity 11; first cavity wall 111; conical cavity 11a; rectangular cavity 11b; liquid inlet 12; liquid outlet 13; guide member 14; mounting part 15; first spray surface 2; first nozzle 21; second spray surface 3; second nozzle 31; third spray surface 4; third nozzle 41; first actuator 5; droplet forming transducer 51; droplet forming waveform source 52; second actuator 6; third actuator 7; third actuator 8; third actuator 9; third actuator 100A; first printhead 100B; second printhead body 100A; second printhead body 100B; second printhead body 100A; second printhead body 100B; third printhead body 100A; second printhead body 100B; third printhead body 100A; second printhead body 100B; third printhead body 100A; second printhead body 100B; third printhead body 100A; third ... 7. Actuator; 8. Mounting component; 9. Liquid return box; 10. Liquid supply box; 200. Substrate conveying mechanism; 201. First conveying section; 202. Second conveying section; 203. Intermediate conveying section; 300. First conveying mechanism; 301. Third conveying section; 302. First intermediate conveying section; 303. Second conveying mechanism; 400. Second conveying section; 401. Fourth conveying section; 402. Second intermediate conveying section; 403. Drying device; 500. Substrate; 600. First drive mechanism; 700. Second drive mechanism; 800. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] This invention proposes a technology combining a shared cavity and an external actuator. The shared cavity reduces the manufacturing cost and design complexity of the printhead. Simultaneously, the external actuator structure simplifies maintenance and assembly, and to some extent reduces the superposition and interference of pressure waves generated by the actuators. This invention provides a universal multi-faceted liquid jetting solution that combines high performance, low cost, and high reliability.

[0023] like Figure 1-8 As shown, this application discloses a printhead 100 having at least two spray surfaces, comprising: a printhead body 1, which includes a cavity 11 and a liquid inlet 12 communicating with the cavity 11; the printhead body 1 has a first spray surface 2 and a second spray surface 3, the first spray surface 2 and the second spray surface 3 being located on different sides of the printhead body 1; the first spray surface 2 has a first nozzle 21 communicating with the cavity 11 and a first actuator 5 disposed near the first nozzle 21, the first actuator 5 being located on the outer surface of the first spray surface 2 and configured to cause liquid in the cavity 11 to be sprayed out from the first nozzle 21; the second spray surface 3 has a second nozzle 31 communicating with the cavity 11 and a second actuator 6 disposed near the second nozzle 31, the second actuator 6 being located on the outer surface of the second spray surface 3 and configured to cause liquid in the cavity 11 to be sprayed out from the second nozzle 31.

[0024] Cavity 11: Cavity 11 is formed by multiple cavity walls connected together to form a space for containing liquid. The liquid inlet 12 is connected to one of the cavity walls of cavity 11. The first spray surface 2 and the second spray surface 3 are respectively connected to the two cavity walls located on different sides.

[0025] Liquid: A substance that can adhere to a substrate by spraying. Liquids can be inks used in printing, textiles and bioprinting, 3D printing materials used in 3D printing processes (such as resins, polymer solutions, food-grade liquids, etc.), conductive liquids used to manufacture electronic components and metal parts, ceramic slurries used to manufacture ceramic parts, etc.

[0026] The first actuator 5, the second actuator 6, and the third actuator 7 appear as follows: the first actuator, the second actuator 6, and the third actuator 7 can cause the liquid to be ejected by generating pressure waves, heat pulses, or mechanical vibrations.

[0027] The first spray surface 2, the second spray surface 3, and the third spray surface 4 (as described below) refer to the surface areas on the printhead body used for spraying liquid, and are provided with one or more nozzles. This can refer to an outer surface of a one-piece molded structure of the printhead body, or the surface of a separate component. In a preferred embodiment, the first spray surface 2 and the second spray surface 3 can be a nozzle plate structure, mounted on the printhead body 1, and precision-machined with nozzles. Furthermore, the first spray surface 2, the second spray surface 3, and the third spray surface 4 can be flat, curved, or any other irregularly shaped surface.

[0028] The first nozzle 21 and the second nozzle 31 share a cavity 11, simplifying the internal liquid flow channel design of the printhead 100. The first actuator 5 is located on the outer surface of the first spray surface 2, and the second actuator 6 is located on the outer surface of the second spray surface 3. This eliminates the need to consider the design space of the first actuator 5 and the second actuator 6 when designing the internal liquid flow channel of the printhead 100, and also suppresses mutual interference between the first actuator 5 and the second actuator 6 to a certain extent. The size and structure of the internal liquid flow channel of the printhead 100 are not affected by the first actuator 5 and the second actuator 6. The design space and size of the internal liquid flow channel of the printhead 100 are more reasonable and flexible, and it can achieve stable and reliable printing on at least two spray surfaces simultaneously, improving printing efficiency and adapting to more printing scenarios and needs. The first actuator 5 and the second actuator 6 are located outside the printhead body 1, which facilitates maintenance and assembly and reduces the manufacturing difficulty of the printhead 100. Balancing the reduction of complexity in the internal liquid flow channel design of the printhead 100 with the improvement of printing efficiency, it enables simultaneous printing of the first jet surface 2 and the second jet surface 3, and can achieve printing on at least two sides of the same substrate, or simultaneous printing on substrates located on different sides, or printing on the surface of substrates with complex structures or uneven surfaces.

[0029] In some embodiments, such as Figure 3 , 7As shown in Figures 8 and 9, the first jetting surface 2 and the second jetting surface 3 are arranged opposite each other, with a certain spatial distance between them. This facilitates the rational arrangement of the substrate transport method or structure, providing highly flexible layout space for equipment performing the inkjet process and its upstream and downstream related processes. This allows the equipment to be optimized according to different process requirements. For simultaneous printing on two different substrates, the transport lines of the two substrates are spatially separated and do not interfere with each other, enabling completely independent operation control. This significantly improves production efficiency and process flexibility, resulting in high space utilization and a compact and rational layout. In other embodiments, the first jetting surface 2 and the second jetting surface 3 can be arranged adjacent to each other, adaptable to printing on polyhedral substrates, and capable of printing on non-planar surfaces such as folded surfaces or corner surfaces of the substrate.

[0030] like Figure 1-2 As shown, the first spray surface 2 can be provided with one or more rows of first spray holes 21. Each row of first spray holes 21 includes two first spray holes 21 arranged in a straight line, an arc, or other form. The second spray surface 3 can be provided with one or more rows of second spray holes 31. Each row of second spray holes 31 includes two or more second spray holes 31 arranged in a straight line, an arc, or other form. The specific arrangement can be determined according to factors such as the size and shape of the substrate surface to be printed and the printing scenario. The substrate can be a liquid-adherable material such as textiles, paper, electronic components, plastic products, metal products, or wood products. The number and arrangement of the first spray holes 21 and the number and arrangement of the second spray holes 31 can be the same or different, depending on the printing requirements.

[0031] In some embodiments, such as Figure 7-9 As shown, the cross-sectional shape of the cavity 11 is symmetrically arranged about the central axis of the liquid inlet 12, and the first spray surface 2 and the second spray surface 3 are also symmetrically arranged about the central axis of the liquid inlet 12. This facilitates the uniform distribution of liquid within the cavity 11 between the first spray hole 21 and the second spray hole 31, reducing the problem of large differences in spray pressure at the spray holes caused by significant differences in the length and shape of the flow path during the liquid flow from the liquid inlet 12 to the first spray surface 2 and the second spray surface 3, thereby improving the stability and consistency of the droplets ejected from the first spray hole 21 and the second spray hole 31, and enhancing the reliability and printing quality of the simultaneous ejection of droplets from the first spray surface 2 and the second spray surface 3.

[0032] like Figure 7Furthermore, in a preferred embodiment, the first spray surface 2 and the second spray surface 3 are symmetrical about a first plane, which is a plane parallel to the central axis o of the inlet 12 and passing through the center point of the end face of the inlet 12; the cavity 11 includes two first cavity walls 111 symmetrically arranged about the first plane; the distance between the two first cavity walls 111 gradually increases in the direction along the central axis o of the inlet 12 and close to the first spray surface 2, and the end faces of the two first cavity walls 111 away from the inlet 12 are respectively connected to the first spray surface 2 and the second spray surface 3. The inlet 12 is designed with a gradually expanding shape between the first spray surface 2 and the second spray surface 3 to reduce resistance and eddy current generation during liquid flow. This design helps to make the flow path of the liquid from the inlet 12 to the first spray surface 2 and the second spray surface 3 more consistent, and the injection pressure of the liquid from the first nozzle 21 and the second nozzle 22 tends to be the same. This can effectively solve the fluid turbulence corresponding to the droplet sequence continuously applied to at least two spray surfaces, so that the two opposing jets can maintain a high degree of independence and stability.

[0033] like Figure 8-9 As shown, further, as another preferred embodiment, the cavity 11 includes a conical cavity 11a and a rectangular cavity 11b communicating with the conical cavity 11a. The upper part of the conical cavity 11a is provided with a liquid inlet 12, and its lower part communicates with the rectangular cavity 11b. The first spray surface 2 and the second spray surface 3 are located on opposite sides of the rectangular cavity 11b, and the first spray hole 21 and the second spray hole 31 are respectively communicating with the rectangular cavity 11b. In the direction along the central axis o of the liquid inlet 12 and close to the first spray surface 2, the cross-sectional area of ​​the conical cavity 11a gradually increases and is symmetrically arranged about the first plane.

[0034] like Figure 7 , 8 As shown, further, the cavity 11 is provided with a flow guide 14 opposite to the liquid inlet 12. The flow guide 14 is located between the first nozzle 21 and the second nozzle 31. The flow guide 14 divides the lower part of the cavity 11 into two parts. The flow guide 14 guides the liquid to flow stably towards the first nozzle 21 and the second nozzle 31, which can reduce the hydraulic jump phenomenon and facilitate the stable spraying of liquid droplets from the first nozzle 21 and the second nozzle 31. Preferably, the cross-sectional shape of the flow guide 14 can be triangular, trapezoidal, or other shapes; the outer wall of the flow guide 14 can be a smooth curved surface; one part of the flow guide 14 is located in the conical cavity, and the other part is located in the rectangular cavity.

[0035] In some embodiments, the first actuator 5 and the second actuator 6 are configured to operate continuously at a preset frequency to split the liquid jets ejected from the first nozzle 21 and the second nozzle 31 into droplet sequences, respectively. Unlike on-demand technology, continuous inkjet technology has extremely stringent requirements for suppressing flow turbulence and jet stability. Any flow turbulence or slight pressure fluctuations may lead to uncontrolled droplet splitting. Continuous inkjet technology has even more stringent requirements for fluid stability within the flow channel. How to achieve independent, stable, and efficient drive control of multiple jet outlets in a liquid jetting device with a shared fluid source and compact space, while suppressing mutual interference between drive units to a certain extent, is precisely the problem that this invention can solve. The shared cavity 11 implies a high degree of temperature and pressure uniformity, and the externally configured separate actuators can reduce the crosstalk effects of the jetting behavior of the first jetting surface 2 and the second jetting surface 3 to a certain extent.

[0036] This invention is applicable not only to on-demand inkjet printing, but also to other liquid jetting systems such as continuous inkjet printing.

[0037] like Figure 2 , 4As shown, in some embodiments, the first actuator 5 includes a droplet-forming transducer 51 disposed around the first nozzle 21 and a droplet-forming waveform source 52 providing a waveform to the droplet-forming transducer 51. The droplet-forming transducer 51 can be any type suitable for generating disturbances in a liquid jet, specifically a thermally excited, piezoelectric, electromagnetic, capacitive, magnetostrictive, shape memory alloy, composite material, MEMS (microelectromechanical systems) or similar vibratory transducer. For example, the droplet-forming transducer 51 includes one or more resistive elements surrounding the nozzle, which excite the liquid jet by sending periodic current pulses of arbitrary shape provided by the droplet-forming waveform source 52 via resistive elements surrounding the orifice of each first nozzle 21. The splitting time of droplets in a particular first nozzle 21 can be controlled by at least one of the pulse amplitude or pulse duty cycle arriving at the corresponding resistive element surrounding the orifice of the first nozzle 21, or the pulse timing relative to other pulses in a sequence of pulses. In this way, small variations in the pulse duty cycle or amplitude allow the droplet splitting time to be adjusted in a predictable manner. Alternatively, the droplet forming transducer 51 includes a piezoelectric ceramic sheet and electrode layers disposed on the upper and lower surfaces of the piezoelectric ceramic sheet, the electrode layers being connected to the first spray surface 2. The droplet forming waveform source 52 includes a signal generator, a drive circuit, and a control circuit connected to the signal generator and the drive circuit. The signal generator is used to generate electrical signals of different frequencies, amplitudes, and waveforms. The control circuit is used to precisely control the waveform output by the signal generator, adjusting parameters such as the frequency and amplitude of the waveform to meet the requirements of different droplet formation. The drive circuit amplifies the signal output by the control circuit to provide sufficient driving power to the droplet forming transducer 51, causing the droplet forming transducer 51 to vibrate and propel the liquid out of the nozzle.

[0038] In some embodiments, such as Figure 9 As shown, the printhead body 1 has a third jetting surface 4 located between the first jetting surface 2 and the second jetting surface 3. The third jetting surface 4 is located on a different side of the printhead body 1 from the first jetting surface 2 and the second jetting surface 3. The third jetting surface 4 has a third nozzle 41 and a third actuator 7 disposed near the third nozzle 41. The third actuator 7 is disposed on the outer surface of the third jetting surface 4 and configured to cause the liquid in the cavity 11 to be ejected from the third nozzle 41. The arrangement of the first jetting surface 2, the second jetting surface 3, and the third jetting surface 4 enables inkjet printing on the surface of a polyhedral substrate, adapting to inkjet printing on different types of substrates.

[0039] like Figure 10As shown, based on the above-described printhead 100, this application embodiment also provides a printing apparatus, including a mounting member 8 and at least one printhead 100 as described above mounted on the mounting member 8. One or more printheads can be mounted on the mounting member 8 to meet the requirements of different printing widths. The arrangement and / or structure of the printheads 100 on the mounting member 8 are determined according to printing quality requirements, etc. Figure 1 As shown, the printhead body 1 has at least one mounting portion 15 for connection with the mounting member 8. Preferably, to avoid limiting the printing distance of the printhead 100, the first jetting surface 2 and the second jetting surface 3 extend along the length direction of the printhead body 1. The mounting portion 15 is located between the first jetting surface 2 and the second jetting surface 3, and is located on at least one side of the printhead body 1 along the length direction. The mounting member 8 is arranged along the length direction of the printhead body 1, and the width of the mounting member 8 is less than or equal to the width of the printhead body 1. The mounting member 8 does not protrude outward from the first jetting surface 2 and the second jetting surface 3 on both sides along the length direction of the printhead body 1. The printing device also includes a liquid supply box 10 and a liquid return box 9 communicating with the liquid inlet 12. In addition, the printhead body 1 also has a liquid return port, which communicates with the liquid return box 9.

[0040] like Figure 11 As shown, based on the printhead 100 and printing apparatus described above, this application embodiment also provides a printing device, including the printing apparatus as described above and a substrate transport mechanism 200. The substrate transport mechanism 200 is configured to transport a substrate to be printed. The substrate transport mechanism 200 is at least partially arranged around the printhead 100. The transport mechanism includes a first transport section 201, a second transport section 202, and an intermediate transport section 203 connecting the first transport section 201 and the second transport section 202. The first transport section 201 is configured so that the front side of the substrate faces the first spray surface 2, and the second transport section 202 is configured so that the back side of the substrate faces the second spray surface 3. The printhead 100 is used to print on both sides of the substrate.

[0041] The intermediate conveying section 203 is equipped with a drying device 500 to dry the substrate after spraying. The drying device 500 is existing technology, so it will not be described in detail here.

[0042] like Figure 12-13As shown, based on the printhead 100 and printing apparatus described above, this application embodiment also provides another printing device, including at least one printing apparatus as described above, a first conveying mechanism 300, and a second conveying mechanism 400. The first conveying mechanism 300 is configured to convey a first substrate to be printed, and the first conveying mechanism 300 includes a first conveying section 301, which is configured to have the reverse or front side of the first substrate facing the first jetting surface 2. The second conveying mechanism 400 is configured to convey a second substrate to be printed, and the second conveying mechanism 400 includes a second conveying section 401, which is configured to have the reverse or front side of the second substrate facing the second jetting surface 3. This printing device can simultaneously inkjet print on two different substrates. Figure 11 As shown, the printing device includes a printing unit.

[0043] like Figure 12 As shown, the printing device includes two printing units as described above, spaced apart, and two printheads, namely a first printhead 100A and a second printhead 100B. The first conveying mechanism 300 further includes a third conveying section 302 and a first intermediate conveying section 303 connecting the first conveying section 301 and the third conveying section 302. The first conveying section 301 is configured such that the reverse side of the first substrate faces the first jetting surface 2 of the first printhead 100A, and the third conveying section 302 is configured such that the front side of the first substrate faces the second jetting surface 3 of the second printhead 100B. The second conveying mechanism 400 includes a fourth conveying section 402 and a second intermediate conveying section 403 connecting the second conveying section 401 and the fourth conveying section 402. The second conveying section 401 is configured such that the reverse side of the second substrate faces the first jetting surface 2 of the first printhead 100A, and the fourth conveying section 402 is configured such that the front side of the second substrate faces the second jetting surface 3 of the second printhead 100B. This printing device can simultaneously perform double-sided inkjet printing on two different substrates.

[0044] The first intermediate conveyor section 303 and the second intermediate conveyor section 403 are equipped with a drying device 500 to dry the substrate after spraying in a timely manner.

[0045] like Figure 14As shown, based on the above-described printhead 100 and printing device, this application embodiment also provides another printing device, including the printing device as described above and a first drive mechanism 700. The first drive mechanism 700 is configured to drive the substrate to be printed relative to the printhead 100. The first drive mechanism 700 may be one or more of the following: belt conveyor, chain conveyor, roller conveyor, rack and pinion conveyor, vacuum suction conveyor, air flotation conveyor, and a rotation mechanism that allows the substrate to rotate around a fulcrum at a certain angle. The rotation mechanism may include a linkage mechanism, cam mechanism, rotary motor, pneumatic motor, hydraulic motor, etc. The output end of the rotation mechanism is connected to the substrate, and the substrate can move relative to the printhead 100 to meet the requirements of printing the entire area of ​​the substrate's surface to be printed and multiple surfaces to be printed; or, the printing device includes the above-described printing device and a second drive mechanism 800. The second drive mechanism 800 is connected to the printhead 100 and is configured to drive the printhead 100 relative to the substrate. The second drive mechanism 800 can be a structure capable of reciprocating motion, including cylinders, hydraulic cylinders, ball screws, electric push rods, conveyor belts, chains, gears, racks, etc., or a rotating mechanism as described above capable of rotating within a certain angle range. The print head 100 can move relative to the substrate to meet the requirements of printing the entire area of ​​the substrate's surface to be printed and multiple surfaces to be printed. Alternatively, the printing device includes the printing apparatus as described above, the first drive mechanism 700, and the second drive mechanism 800. The first drive mechanism 700 is configured to drive the substrate to be printed to move relative to the print head 100. The second drive mechanism 800 is connected to the print head 100 and is configured to drive the print head 100 to move relative to the substrate, so that both the substrate and the print head 100 can move relative to each other. This can meet the printing requirements of multi-faceted substrates, and can print surfaces that are curved, folded, or irregular, adapting to different types and specifications of substrates and different printing scenarios, ensuring printing quality and improving printing efficiency.

[0046] Although embodiments of the present invention have been shown and described above, they should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A printhead having at least two spray surfaces, characterized in that, include: A printhead body includes a cavity and a liquid inlet communicating with the cavity. The printhead body includes at least a first jetting surface and a second jetting surface, and the first jetting surface and the second jetting surface are located on different sides of the printhead body. The first spray surface is provided with a first spray hole communicating with the cavity and a first actuator disposed near the first spray hole. The first actuator is located on the outer surface of the first spray surface and is configured to cause the liquid in the cavity to be sprayed out from the first spray hole. The second spray surface is provided with a second spray hole communicating with the cavity and a second actuator disposed near the second spray hole. The second actuator is located on the outer surface of the second spray surface and is configured to cause the liquid in the cavity to be sprayed out from the second spray hole.

2. The printhead as described in claim 1, characterized in that, The first spray surface and the second spray surface are arranged opposite to each other.

3. The printhead having at least two spray surfaces as described in claim 2, characterized in that, The first spray surface and the second spray surface are symmetrical about a first plane, which is a plane parallel to the central axis of the liquid inlet and passing through the center point of the end face of the liquid inlet. The cavity includes two first cavity walls symmetrically arranged about the first plane; the distance between the two first cavity walls gradually increases in the direction along the central axis of the liquid inlet and close to the first spray surface, and the end faces of the two first cavity walls away from the liquid inlet are respectively connected to the first spray surface and the second spray surface.

4. The printhead having at least two spray surfaces as described in claim 2, characterized in that, The cross-sectional shape of the cavity is symmetrical about the central axis of the liquid inlet, and the first spray surface and the second spray surface are symmetrical about the central axis of the liquid inlet.

5. The printhead having at least two spray surfaces as described in claim 2, characterized in that, The cavity is provided with a flow guide that is positioned opposite to the liquid inlet, and the flow guide is located between the first spray hole and the second spray hole.

6. The printhead having at least two jetting surfaces as described in claim 1, characterized in that, The first actuator includes a droplet forming transducer disposed around the first nozzle and a droplet forming waveform source that provides a waveform to the droplet forming transducer.

7. The printhead having at least two jetting surfaces as described in claim 1 or 5, characterized in that, The first actuator and the second actuator are configured to operate continuously at a preset frequency so that the liquid jets ejected from the first nozzle and the second nozzle are split into droplet sequences, respectively.

8. A printing device, characterized in that, It includes a mounting component and at least one printhead having at least two spray surfaces as described in any one of claims 1-6, mounted on the mounting component.

9. A printing device, characterized in that, include: The printing apparatus as described in claim 8; A substrate conveying mechanism is configured to convey a substrate to be printed. The substrate conveying mechanism is at least partially arranged around the print head. The conveying mechanism includes a first conveying section, a second conveying section, and an intermediate conveying section connecting the first conveying section and the second conveying section. The first conveying section is configured to face the front side of the substrate toward the first spray surface, and the second conveying section is configured to face the back side of the substrate toward the second spray surface.

10. The printing apparatus as described in claim 9, characterized in that, The intermediate conveying section is equipped with a drying device.

11. A printing device, characterized in that, include: At least one printing apparatus as described in claim 8; A first conveying mechanism is configured to convey a first substrate to be printed. The first conveying mechanism includes a first conveying section, which is configured to face the reverse or front side of the first substrate toward the first spraying surface. A second conveying mechanism is configured to convey a second substrate to be printed. The second conveying mechanism includes a second conveying section configured to face the reverse or front side of the second substrate toward the second printing surface.

12. The printing apparatus as claimed in claim 11, characterized in that, include: Two printing devices as described in claim 8 are spaced apart, and the two print heads are respectively a first print head and a second print head; The first conveying mechanism further includes a third conveying section and a first intermediate conveying section connecting the first conveying section and the third conveying section. The first conveying section is configured to face the reverse side of the first substrate toward the first spray surface of the first print head, and the third conveying section is configured to face the front side of the first substrate toward the second spray surface of the second print head. The second conveying mechanism includes a fourth conveying section and a second intermediate conveying section connecting the second conveying section and the fourth conveying section. The second conveying section is configured to face the reverse side of the second substrate toward the first spray surface of the first printhead, and the fourth conveying section is configured to face the front side of the second substrate toward the second spray surface of the second printhead.

13. A printing device, characterized in that, include: The printing apparatus as described in claim 8; A first drive mechanism is configured to drive the substrate to be printed to move relative to the print head; Alternatively, a second drive mechanism, connected to the printhead, is configured to drive the printhead to move relative to the substrate; Alternatively, the first drive mechanism is configured to drive the substrate to be printed to move relative to the printhead; The second drive mechanism, connected to the printhead, is configured to drive the printhead to move relative to the substrate.

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