Printheads and printing equipment

Abstract

This disclosure relates to a printhead and a printing apparatus. The printhead includes: a substrate, a plurality of nozzles, and a liquid supply assembly. The liquid supply assembly includes: at least one first buffer chamber adapted to be connected to a liquid source and configured to receive liquid from the liquid source; a plurality of first resistance channels disposed between the first buffer chamber and nozzle inlets of nozzle channels of the nozzles, each first resistance channel having a first resistance channel inlet communicating with at least one first buffer chamber and a first resistance channel outlet opposite to the first resistance channel inlet, wherein the first resistance channel has increased flow resistance relative to the first buffer chamber, such that liquid enters from the first buffer chamber through the first resistance channel inlet and flows out through the first resistance channel outlet with increased flow resistance to enter the nozzle inlet of the nozzle channels.

Description

Technical Field

[0001] This disclosure relates generally to digital inkjet printing, and more specifically to a liquid supply system for inkjet printing equipment. Background Technology

[0002] Inkjet printing equipment uses digital inkjet printing technology to print onto substrates. The equipment includes a printhead with an array of nozzles and ink cartridges that supply liquids such as pretreatment solutions and ink to the nozzle array. The printhead array can be actuated by piezoelectric actuators, such as piezoelectric ceramics. Ink is printed by applying voltage to the electrodes of the piezoelectric actuators to cause the printhead to vibrate.

[0003] Traditional printheads are typically connected to an ink cartridge, which contains a height gauge. This height gauge allows adjustment of the pressure at the horizontal position of the printhead array within the cartridge, thereby regulating the flow resistance of the printhead array. However, the complex structure of this type of printhead cartridge results in a large printhead size, hindering device miniaturization and leading to high equipment costs. Summary of the Invention

[0004] Embodiments of this disclosure provide a printhead and a printing apparatus designed to address one or more of the problems described above, as well as other potential problems.

[0005] According to a first aspect of this disclosure, a printhead is provided. The printhead includes: a substrate including a plurality of needle mounting holes; a plurality of needles mounted on the substrate, each needle including a needle channel extending axially, the needle channel having a needle inlet and a needle outlet; and a liquid supply assembly mounted to the substrate, and including: at least one first buffer chamber adapted to be connected to a liquid source and configured to receive liquid from the liquid source; a plurality of first resistance channels disposed between the first buffer chamber and the needle inlet of the needle channel of the needles, each first resistance channel having a first resistance channel inlet communicating with at least one first buffer chamber and a first resistance channel outlet opposite to the first resistance channel inlet, wherein the first resistance channel has an increased flow resistance relative to the first buffer chamber, such that liquid enters from the first buffer chamber through the first resistance channel inlet and flows out of the first resistance channel outlet with the increased flow resistance to enter the needle inlet of the needle channel.

[0006] In some embodiments, the substrate may include a first side adapted to accommodate the nozzle and a second side opposite to the first side, wherein the liquid supply assembly is mounted to the substrate at the second side.

[0007] In some embodiments, the total flow resistance of each of the plurality of first resistance channels may be substantially the same as that of each other.

[0008] In some embodiments, the surface roughness of the inner wall surfaces of the plurality of first resistance channels may be no greater than 25 μm and no greater than 2 μm.

[0009] In some embodiments, the pressure of the liquid generated by the flow resistance of the first resistance channel may be no less than twice the maximum channel static pressure of the first resistance channel, and in particular no less than five times, no less than ten times, or no less than fifty times.

[0010] In some embodiments, the first resistance channel may be formed in the body by machining.

[0011] In some embodiments, the number of nozzles is n times the number of the first resistance channels, where n is a positive integer, and every n nozzles are liquid-connected to the first buffer chamber via one of the first resistance channels.

[0012] In some embodiments, the liquid supply assembly may include: a second liquid communication body including a body defining the at least one first buffer chamber and including: a liquid inlet disposed on the body and communicating with the first buffer chamber, the liquid inlet being adapted to be connected to the liquid source; and the plurality of conduit mounting holes communicating with the first buffer chamber; and a plurality of conduits, one end of each conduit being mounted in the conduit mounting hole and the other end being mounted to the base, and each conduit including a hollow conduit forming the first resistance channel.

[0013] In some embodiments, the body may include a recess with an opening on one side, and the liquid supply assembly may further include a cover plate disposed on the one side, the cover plate being configured to close the recess to form the first buffer cavity.

[0014] In some embodiments, the fluid supply assembly may further include pressure plates, each pressure plate including a through hole adapted for passage of the plurality of catheters and configured to press the catheters against the body.

[0015] In some embodiments, the liquid supply assembly may further include at least one support plate, each of the support plates including a through hole adapted for passage of the plurality of conduits and configured to support the conduits at a distance between the second liquid connector and the substrate.

[0016] In some embodiments, the substrate may further include a plurality of second resistance channels disposed within the substrate, the number of the second resistance channels being the same as the number of the nozzles, and each of the first resistance channels being connected to the nozzle inlet of the nozzle via the second resistance channel.

[0017] In some embodiments, the second liquid communication body further includes a third resistance channel disposed between the first buffer chamber and the conduit mounting hole.

[0018] In some embodiments, the flow resistance of the first resistance channel is greater than any of the following: the flow resistance of the second resistance channel; the flow resistance of the third resistance channel; and the flow resistance of the needle channel. In some embodiments, the upper inner wall surface of the second resistance channel may be substantially flush with the upper inner wall surface of the needle mounting hole.

[0019] In some embodiments, the lower inner wall surface of the second resistance channel may be higher than the lower inner wall surface of the needle mounting hole to form a stepped portion relative to the needle mounting hole.

[0020] In some embodiments, the nozzle inlet of the nozzle is spaced apart from the stepped portion by a distance.

[0021] In some embodiments, the second liquid communication body may further include a third resistance channel disposed between the first buffer chamber and the conduit mounting hole, the diameter of the third resistance channel being smaller than the outer diameter of the conduit and larger than the inner diameter of the conduit.

[0022] According to a second aspect of this disclosure, a printing apparatus is provided. The printing apparatus includes: a liquid source; a pumping device; and a printhead according to any one of the first aspects, wherein the pumping device is configured to supply liquid from the liquid source to the printhead.

[0023] According to the embodiments of the present disclosure, the uniformity of liquid output from each of the plurality of nozzles can be improved. Attached Figure Description

[0024] The above and other objects, features, and advantages of embodiments of the present disclosure will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated in the drawings by way of example and not limitation.

[0025] Figure 1 A schematic diagram of a printing apparatus according to an embodiment of the present disclosure is shown.

[0026] Figure 2 A general schematic diagram of the print head of a printing apparatus according to an embodiment of the present disclosure is shown.

[0027] Figure 3 It shows Figure 2 A partial schematic diagram of the printhead is shown.

[0028] Figure 4 It shows Figure 2 The diagram shows an exploded view of the printhead.

[0029] Figure 5 It shows Figure 2 The diagram shows a partial cross-sectional view of the printhead, where circular portions C and D show enlarged views of the conduit in the substrate and liquid communication body, respectively.

[0030] In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0031] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0032] The term "comprising" and its variations as used herein signify an open-ended inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". Terms such as "upper", "lower", "front", and "rear", indicating placement or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are used only for the purpose of describing the principles of this disclosure, and are not intended to indicate or imply that the elements referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting this disclosure.

[0033] Figure 1 A schematic diagram of a printing apparatus 1 according to an embodiment of the present disclosure is shown. Figure 1 As shown, the printing apparatus 1 includes a liquid source 200, a pump device 300, and a printhead 100. The liquid source 200 can be a container for ink to be printed or various processing liquids. Ink can be printed onto a substrate 400 to form a predetermined pattern. In addition to ink, various processing liquids can also be printed onto the substrate 400 via the printhead 100. The printhead 20 may include a printhead cavity. By operating the pump device 300, liquid in the liquid source 200 is supplied to the printhead cavity of the printhead 20, creating a pressure environment within the printhead cavity. A needle array consisting of a plurality of needles 120 is disposed within the printhead cavity. Each needle 120 in the needle array includes a needle channel having a needle inlet communicating with the printhead cavity and a needle outlet exposed to ambient air. During operation of the printhead 100, liquid is printed onto the substrate 400 located below the needles 120 via the needles 120.

[0034] Each nozzle array typically comprises multiple nozzles, each forming a liquid ejection channel. Digital inkjet printing requires uniform ink ejection from each nozzle of the printhead. Besides being affected by the voltage applied to the piezoelectric actuator, the structure of the liquid supply channel from the liquid source to each nozzle channel significantly influences the ink ejection volume. Despite various measures, such as the design of the pump assembly 300 and the piping design from the liquid source 200 to the printhead 100, to ensure consistent ink ejection from the nozzle array on the printhead, the results in ensuring uniform ink ejection from each nozzle of the nozzle array on the printhead remain unsatisfactory.

[0035] According to this disclosure, a printhead including a liquid supply assembly is provided. The liquid supply assembly includes at least one first buffer chamber and a plurality of first resistance channels. The first buffer chamber is adapted to be connected to a liquid source and configured to receive liquid from the liquid source. The first resistance channels are arranged between the first buffer chamber and the nozzle inlet of the nozzle channel of the nozzle. Each first resistance channel has a first resistance channel inlet communicating with at least one first buffer chamber and a first resistance channel outlet opposite to the first resistance channel inlet. The first resistance channel has an increased flow resistance relative to the first buffer chamber, such that liquid enters from the first buffer chamber through the first resistance channel inlet and flows out of the first resistance channel outlet with the increased flow resistance to enter the nozzle inlet of the nozzle channel. The liquid supply assembly according to this disclosure, particularly the increased flow resistance provided by the first resistance channels located between the first buffer chamber and the nozzle, makes the pressure of the fluid at the nozzle inlet of the nozzle channel substantially equal. This improves the uniform spraying performance of the printhead, and particularly improves the uniform spraying performance of each nozzle in the nozzle array on the printhead. The printhead according to embodiments of this disclosure is described in detail below with reference to the accompanying drawings.

[0036] Figures 2-5 A schematic diagram of the structure of a printhead 100 of a printing apparatus according to an embodiment of the present disclosure is shown. The printhead 100 includes a substrate 110, a nozzle array consisting of a plurality of nozzles 120, and a liquid supply assembly 130. The substrate 110 may include two surfaces opposite to each other. The liquid supply assembly 130 may be mounted to one surface of the substrate 110 on one side of the substrate 110, and the nozzle array consisting of a plurality of nozzles 120 may be mounted to the other surface of the substrate 110 on the opposite side of the substrate 110.

[0037] A nozzle array consisting of multiple nozzles 120 is mounted on the substrate 110. Each nozzle in the nozzle array can be actuated by a piezoelectric actuator 122, and control components for controlling the piezoelectric actuator 122 are also mounted on another surface of the substrate 110. The printhead 100 may also include a cover 113, which can be fixed to the substrate 110 to house components such as the piezoelectric actuator 122 and control components within an enclosed space.

[0038] The substrate 110 may include a plurality of nozzle mounting holes 112, each nozzle mounting hole being adapted to receive a nozzle 120. Each nozzle 120 includes a nozzle channel extending axially, the nozzle channel having a nozzle inlet and a nozzle outlet.

[0039] In some embodiments, the liquid supply assembly 130 is formed as a liquid connector 136. The liquid connector 136 may include a body in the shape of a cuboid box and is fixed to the base 110, for example, via screws 149. It should be understood that the shape of the illustrated liquid connector 136 is merely exemplary, and the liquid connector 136 may be any other suitable shape. The interior of the liquid connector 136 may include one or more first buffer chambers 132. The first buffer chamber 132 is connected to a liquid source and configured to receive liquid from the liquid source. The liquid connector 136 may be provided with one or more valve ports 147, which may be connected to the liquid supply line of the pump assembly 300.

[0040] A plurality of first resistance channels 134 are also provided within the liquid communication body 136. The first resistance channels 134 are arranged between the first buffer chamber 132 and the nozzle inlet of the nozzle channel of the nozzle 120, and connect the first buffer chamber 132 to the nozzle channel of the nozzle 120. Each first resistance channel 134 has a channel inlet communicating with the first buffer chamber 132 and a channel outlet opposite to the first resistance channel inlet. The first resistance channel 134 has a significantly increased flow resistance relative to the first buffer chamber 132; and the flow resistance of the nozzle channel is less than the flow resistance of the first resistance channel 134. The first resistance channel 134 corresponds to the section with the greatest flow resistance in the nozzle supply path. Liquid from the pump device 300 first enters the first buffer chamber 132, and then directly or indirectly enters the nozzle channel of the nozzle 120 via the first resistance channels 134. Because the first resistance channel 134 has a significantly increased flow resistance relative to the first buffer chamber 132, the liquid will flow out of the first resistance channel outlet with increased flow resistance to enter the nozzle inlet of the nozzle channel.

[0041] Due to the significantly increased flow resistance provided by the first resistance channel 134, pressure disturbances at the channel outlet of the first resistance channel 134 can be minimized. This is important for uniform spraying of the nozzle, otherwise any pressure disturbance at the channel outlet of the first resistance channel 134 would affect the liquid output of the nozzle 120.

[0042] The shape of the first resistance channel 134 can be various. In some embodiments, the channel cross-section of the first resistance channel 134 is constant; in other embodiments, the channel cross-section of the first resistance channel 134 is variable. In some embodiments, the first resistance channel 134 can be formed in the liquid communication body 136 by machining. In particular, the first resistance channel 134 can be formed into a shape that is easy to process, such as a circle. In some embodiments, the total flow resistance of each of the plurality of first resistance channels 134 is substantially the same as that of each other. In this case, for different nozzles, it can be ensured that the liquid pressure at the channel outlet of the first resistance channel 134 adjacent to each nozzle is substantially the same. Thus, the liquid output of each of the plurality of nozzles can be made more uniform. In some embodiments, the number of first resistance channels 134 can be the same as the number of nozzles. In other embodiments, the number of first resistance channels 134 can be greater than or less than the number of nozzles.

[0043] In some embodiments, the surface roughness of the inner wall surfaces of the plurality of first resistance channels 134 is no greater than 25 μm and no greater than 2 μm. A smooth inner wall surface can suppress pressure disturbances caused by surface roughness. In some embodiments, the liquid pressure generated by the flow resistance of the first resistance channel 134 is no less than twice the maximum channel static pressure of the first resistance channel 134, particularly no less than five times, no less than ten times, and no less than 50 times. It should be understood that these multiples are merely illustrative and may be other suitable multiples. The term "maximum channel static pressure" refers to the difference between the first hydrostatic pressure formed in the needle with the highest height among the plurality of needles and the second hydrostatic pressure formed in the needle with the lowest height among the plurality of needles when the nozzle is configured in a non-horizontal mode. The magnitude of the maximum channel static pressure depends primarily on the liquid density and the vertical height of the pipe.

[0044] In some embodiments, liquid from the pump device 300 enters the nozzle channel of the nozzle 120 directly from the first buffer chamber 132 via the first resistance channel 134. In some embodiments, liquid from the pump device 300 enters the nozzle channel of the nozzle 120 indirectly from the first buffer chamber 132 via the first resistance channel 134.

[0045] Liquid connector 136 Liquid connector 136 Liquid connector 136 In some embodiments, the liquid supply assembly 130 is formed as a combination of a plurality of conduits 138 and liquid connector 136.

[0046] The substrate 110 may include a plurality of nozzle mounting holes 112, each nozzle mounting hole being adapted to receive a nozzle 120. Each nozzle 120 includes a nozzle channel extending axially, the nozzle channel having a nozzle inlet and a nozzle outlet.

[0047] In some embodiments, the liquid supply assembly 130 includes a second liquid communication body 136 and a plurality of conduits 138 communicating with the second liquid communication body 136. The second liquid communication body 136 may include a body. The body defines one or more first buffer cavities 132. In particular, as Figure 5 As shown in the enlarged view of the circled portion, the main body may be provided with a liquid inlet 131 communicating with the first buffer chamber 132. The liquid inlet 131 is adapted to be connected to the liquid supply pipe of the pump device 300. Thus, liquid can be supplied to the first buffer chamber 132 through the liquid inlet 131.

[0048] The second liquid communication body 136 also includes a plurality of conduit mounting holes 172. One end of each conduit 138 is installed in a conduit mounting hole 172 and the other end is installed to the base 110. Each conduit 138 includes a hollow tube forming a first resistance channel 134. The first resistance channel 134 has a significantly increased flow resistance relative to the first buffer chamber 132. Liquid from the pump assembly 300 first enters the first buffer chamber 132 and then enters the needle channel of the needle 120 directly or indirectly via the first resistance channel 134. Because the first resistance channel 134 has a significantly increased flow resistance relative to the first buffer chamber 132, the liquid will flow out of the first resistance channel outlet with the pressure generated by the increased flow resistance to enter the needle inlet of the needle channel.

[0049] According to this disclosure, the processing and manufacturing of the conduits 138 can be facilitated by forming a first resistance channel 134 using multiple independently formed conduits 138 and utilizing the internal channels of the conduits 138. Considering the high requirements for the surface roughness of the inner wall surface in each conduit 138, by forming each conduit 138 independently, the conduits 138 can be processed at a lower cost and the flow resistance of each conduit 138 can be controlled more precisely. In some embodiments, the inner wall surface of the conduit 138 is as smooth as possible, particularly with a surface roughness of no more than 25 μm and no more than 2 μm. A smooth inner wall surface can suppress pressure disturbances caused by surface roughness. In some embodiments, the pressure exerted on the liquid by the flow resistance of the conduit 138 is no less than twice the maximum channel static pressure of the conduit 138, particularly no less than five times and no less than ten times. The channel cross-section of the conduit 138 can be constant or variable. In some embodiments, the channel cross-section of the conduit 138 can be square, circular, etc. In some embodiments, the length, size, and shape of different conduits 138 can be the same as each other, but the total flow resistance provided by different conduits 138 is approximately the same as each other.

[0050] The number of nozzles is n times the number of first resistance channels, where n is a positive integer, and every n nozzles are connected to the first buffer chamber by liquid through a first resistance channel.

[0051] In some embodiments, the number of conduits 138 may be set to be the same as the number of nozzles 120. Thus, after the liquid from the pump device 300 enters the first buffer chamber 132, it directly enters the nozzle channel of the nozzle 120 via the conduits 138.

[0052] In some embodiments, the second liquid communication body 136 may include a recess 133 with an opening on one side, which can be used to form a first buffer chamber 132. The liquid supply assembly 130 also includes a cover plate 135 disposed opposite to the recess 133. The cover plate 135 can be fixed to the second liquid communication body 136 using fasteners such as screws to close the recess 133, thereby forming the first buffer chamber 132. Forming the first buffer chamber 132 using the recess 133 and the cover 135 can reduce the cost of the device. In some embodiments, a sealing ring 171 may be provided at the interface between the recess 133 and the cover 135.

[0053] In some embodiments, the second liquid communication body 136 further includes a third resistance channel 174 disposed between the first buffer chamber 132 and the conduit mounting hole 172. The diameter of the third resistance channel 174 is smaller than the outer diameter of the conduit 138 and larger than the inner diameter of the conduit 138. Thus, the flow resistance of the third resistance channel 174 is less than the flow resistance of the conduit 138, and the conduit 138 can be securely fastened by the step portion formed by the third resistance channel 174.

[0054] In some embodiments, the liquid supply assembly 130 further includes pressure plates 137. Each pressure plate 137 includes a through-hole through which a plurality of conduits 138 pass and is configured to press the conduits 138 against the body of the second liquid connector 136. In some embodiments, a sealing ring 173 may be provided at the interface of the pressure plate 137, the conduits 138, and the second liquid connector 136.

[0055] In some embodiments, the fluid supply assembly 130 further includes one or more support plates and / or support frames 139. Each support plate 139 includes a through-hole accommodating a plurality of conduits 138. The support plates 139 are arranged at a distance between the first fluid communication body 136 and the base 110 and support the conduits 138. This can improve the support stiffness of the conduits 138.

[0056] In some embodiments, such as Figure 5As shown in partial enlarged view C, the end of conduit 138 opposite to the second liquid connector 136 may be fixed to the base 110 and fluidly communicated to the nozzle 120 via the base 110. It should be understood that this is exemplary. In other embodiments, the end of conduit 138 opposite to the second liquid connector 136 is directly connected to the nozzle 120.

[0057] In some embodiments, the substrate 110 further includes a plurality of second resistance channels 113 disposed within the substrate 110, the number of second resistance channels being the same as the number of nozzles 120, and each conduit 134 communicating with the nozzle inlet of the nozzle 120 via a second resistance channel. Thus, a liquid supply channel is formed via the conduit 138, the second resistance channels 113, and the nozzles 120. Since each nozzle is individually supplied with liquid, the flow resistance of the liquid supply path of each nozzle can be precisely controlled. In some embodiments, a pressure plate 145 may be provided to fix the conduit 138, the pressure plate 145 being provided with a through hole for the conduit 138 to pass through, and the conduit 138 being fixed to the substrate 110 via the pressure plate 145.

[0058] In some embodiments, the orifice diameter of the second resistance channel 113 is larger than that of the first resistance channel 134. This means that the flow resistance of the second resistance channel 113 is less than that of the first resistance channel 134. In some embodiments, the flow resistance of the needle channel is less than that of the second resistance channel 113. Therefore, the first resistance channel 134 is the section with the highest flow resistance in the liquid supply circuit of the needle. By using the long-distance first resistance channel 134, uniform pressure at the inlet of each needle can be effectively achieved. In some embodiments, the ratio of the flow resistance of the second resistance channel 181 to the flow resistance of the first resistance channel 134 is, for example, any value between 1:800 and 1:1000. In some embodiments, the ratio of the flow resistance of the second resistance channel 181 to the flow resistance of the first resistance channel 134 is, for example, 1:900.

[0059] In some embodiments, such as Figure 5 As shown in enlarged section C, the upper inner wall surface of the second resistance channel 113 is approximately flush with the upper inner wall surface of the needle mounting hole 112. In this way, even if air bubbles appear near the inlet of the needle 120, they can be easily guided away from the inlet of the needle 120.

[0060] In some embodiments, such as Figure 5As shown in enlarged portion C, the lower inner wall surface of the second resistance channel 113 is higher than the lower inner wall surface of the needle mounting hole 112. Therefore, a step portion 115 can be formed at the needle mounting hole 112. Due to the step portion, even if bubbles appear near the needle inlet of the needle 120, the bubbles will not accumulate on the lower inner wall surface. In some embodiments, the needle inlet of the needle 120 is spaced apart from the step portion 115 by a distance. Therefore, the space between the needle inlet and the step portion 115, particularly the upper part of this space, can be used as a bubble collecting portion 117. This prevents bubbles from accumulating near the needle inlet of the needle 120.

[0061] According to this disclosure, liquid from the buffer chamber is supplied to the nozzle 120 after passing through a plurality of first resistance channels 134, which are the largest flow resistance parts on the liquid supply path, located upstream of the nozzle 120. This makes the liquid pressure supplied at different nozzle locations uniform and improves printing performance.

[0062] Furthermore, although the operations are depicted in a specific order, this should not be construed as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0063] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A printhead, characterized in that, include: The substrate (110) includes multiple needle mounting holes (112); Multiple nozzles (120) are mounted on the substrate (110), each nozzle (120) including a nozzle channel extending along the axial direction, the nozzle channel having a nozzle inlet and a nozzle outlet; as well as A liquid supply assembly (130) is mounted to the substrate (110) and includes: At least one first buffer chamber (132) is adapted to be connected to a liquid source and configured to receive liquid from the liquid source; A plurality of first resistance channels (134) are arranged between the first buffer chamber (132) and the nozzle inlet of the nozzle channel of the nozzle (120), each first resistance channel (134) having a first resistance channel inlet communicating with at least one of the first buffer chambers (132) and a first resistance channel outlet opposite to the first resistance channel inlet, wherein the first resistance channel (134) has an increased flow resistance relative to the first buffer chamber (132) such that liquid enters from the first buffer chamber (132) into the first resistance channel inlet and flows out of the first resistance channel outlet with the increased flow resistance to enter the nozzle inlet of the nozzle channel.

2. The printhead according to claim 1, characterized in that, The substrate (110) includes a first side adapted to accommodate the nozzle (120) and a second side opposite to the first side, wherein the liquid supply assembly (130) is mounted to the substrate (110) at the second side.

3. The printhead according to claim 1, characterized in that, The total flow resistance of each of the plurality of first resistance channels (134) is substantially the same as that of each other.

4. The printhead according to claim 3, characterized in that, The pressure of the liquid generated by the flow resistance of the first resistance channel (134) is not less than twice the maximum channel static pressure of the first resistance channel (134).

5. The printhead according to claim 3, characterized in that, The pressure of the liquid generated by the flow resistance of the first resistance channel (134) is not less than 5 times the maximum channel static pressure of the first resistance channel (134).

6. The printhead according to claim 3, characterized in that, The pressure of the liquid generated by the flow resistance of the first resistance channel (134) is not less than 10 times the maximum channel static pressure of the first resistance channel (134).

7. The printhead according to claim 3, characterized in that, The pressure of the liquid generated by the flow resistance of the first resistance channel (134) is not less than 50 times the maximum channel static pressure of the first resistance channel (134).

8. The printhead according to any one of claims 1-7, characterized in that, The number of the nozzles (120) is n times the number of the first resistance channels (134), where n is a positive integer, and every n nozzles (120) are liquid-connected to the first buffer chamber (132) via one of the first resistance channels (134).

9. The printhead according to claim 8, characterized in that, The liquid supply assembly (130) includes: The second liquid communication body (136) includes a body defining the at least one first buffer cavity (132) and includes: A liquid inlet (131) disposed on the main body and in communication with the first buffer chamber (132), the liquid inlet (131) being adapted to be connected to the liquid source; and Multiple conduit mounting holes (172) communicating with the first buffer chamber (132); and A plurality of conduits (138), one end of each conduit (138) is installed in a corresponding conduit mounting hole in the plurality of conduit mounting holes (172) and the other end is installed to the base (110), and each conduit (138) includes a hollow tube that forms the first resistance channel (134).

10. The printhead according to claim 9, characterized in that, The main body includes a recess (133) with an opening on one side, and the liquid supply assembly (130) also includes a cover plate (135) disposed on the same side, the cover plate (135) being configured to close the recess (133) to form the first buffer cavity (132).

11. The printhead according to claim 9, characterized in that, The liquid supply assembly (130) also includes pressure plates (137), each pressure plate (137) having a through hole through which the conduit (138) passes and being configured to press the conduit (138) against the body.

12. The printhead according to claim 8, characterized in that, The substrate (110) further includes a plurality of second resistance channels (113) disposed within the substrate (110), the number of the second resistance channels being the same as the number of the nozzles (120), and each of the first resistance channels (134) being connected to the nozzle inlet of the nozzle (120) via the second resistance channel.

13. The printhead according to claim 9, characterized in that, The second liquid communication body also includes a third resistance channel disposed between the first buffer chamber and the conduit mounting hole.

14. The printhead according to claim 13, characterized in that, The flow resistance of the first resistance channel is greater than any of the following: Flow resistance of the second resistance channel; The flow resistance of the third resistance channel; and Flow resistance in the nozzle channel.

15. A printing device (1), characterized in that, include: Liquid source (200); Pump unit (300); and The printhead (100) according to any one of claims 1-14, wherein the pump device (300) is configured to supply liquid from the liquid source (200) to the printhead.

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