Printer

Abstract

The utility model relates to a printer which comprises a liquid supply part, a liquid pumping part, a liquid adding quantitative assembly, a first three-way valve and a spray head assembly, the liquid pumping part is connected with the liquid supply part and the first three-way valve, and the first three-way valve is further connected with the liquid adding quantitative assembly and the spray head assembly. The liquid pumping part pumps liquid from the liquid supply part and supplies the liquid to the liquid adding quantitative assembly through the first three-way valve, and the liquid adding quantitative assembly supplies the liquid with the same volume to the spray head assembly through the first three-way valve every time. By arranging the liquid adding quantitative assembly, the amount of liquid injected each time is a determined value, and the situation that waste is caused by excessive liquid supply and the effect is weakened due to too little liquid supply can be avoided.

Description

Technical Field

[0001] This application relates to the field of printer technology, and more particularly to a printer. Background Technology

[0002] Most printers on the market inject a fixed amount of liquid into the printhead using a water pump. Specifically, the amount of liquid injected is controlled by controlling the working duration of the water pump. However, due to objective factors such as dimensional tolerances of water pump components and motor speed tolerances, there will be large differences in the flow rate of individual water pumps, making it impossible to accurately measure the liquid.

[0003] Therefore, the key issue to be addressed is how to achieve precise injection of a fixed amount of liquid into the printhead by the printer. Summary of the Invention

[0004] This application provides a printer to address the problem that the objective situation of dimensional tolerances and motor speed tolerances in water pump components can cause large differences in the flow rate of individual water pumps, making it impossible to perform accurate quantification.

[0005] In a first aspect, this application provides a printer comprising a liquid supply unit, a liquid extraction unit, a liquid dispensing and metering component, a first three-way valve, and a printhead assembly. The liquid extraction unit is connected to the liquid supply unit and the first three-way valve, and the first three-way valve is also connected to the liquid dispensing and metering component and the printhead assembly. The liquid extraction unit extracts liquid from the liquid supply unit and supplies it to the liquid dispensing and metering component through the first three-way valve. The liquid dispensing and metering component supplies the same volume of liquid to the printhead assembly each time through the first three-way valve.

[0006] Optionally, the liquid addition metering component includes a barrel and a piston. One end of the barrel is provided with a receiving groove. At least part of the piston is received in the receiving groove and matches the shape and size of the cross-section of the receiving groove and can move along the inner wall of the receiving groove. The bottom of the barrel is provided with a liquid inlet communicating with the receiving groove.

[0007] Optionally, it also includes a receiving groove cover, the receiving groove having an opening, the receiving groove cover sealing the opening of the receiving groove, and a passage opening with a shape and size matching the end of the piston member away from the bottom of the receiving groove being opened in the middle of the receiving groove cover.

[0008] Optionally, the piston component includes a piston body and an elastic body, the elastic body being sleeved on the piston body with one end abutting against the piston body and the other end abutting against the receiving groove cover.

[0009] Optionally, the piston body includes a piston rod and a piston head. The piston head is fixedly connected to one end of the piston rod. The shape and size of the cross-section of the piston head match the shape and size of the cross-section of the receiving groove. The shape and size of the cross-section of the piston rod match the shape and size of the through-hole. The piston head is disposed in the receiving groove and is sealed to the inner wall of the receiving groove. The piston rod portion extends out of the receiving groove from the through-hole.

[0010] Optionally, an abutment is fixedly provided on the side of the piston rod. The abutment is larger than the size of the elastic body in the cross-section of the piston rod. One end of the elastic body abuts against the abutment and the other end abuts against the receiving groove cover.

[0011] Optionally, a limiting structure is fixedly provided in the receiving groove. The limiting structure is fixedly provided on one side of the receiving groove cover near the bottom of the receiving groove. The limiting structure is provided on the periphery of the passage. The limiting structure abuts against the abutting member when the piston rod moves away from the receiving groove.

[0012] Optionally, the limiting structure is a hollow cylindrical structure covering the outside of the passage, and the dimension of the limiting structure on the cross-section of the piston column is larger than the dimension of the elastic body and smaller than the dimension of the abutment.

[0013] Optionally, the printer further includes a waste ink recycling component, which includes a waste ink cartridge fixedly connected to the liquid supply unit.

[0014] Optionally, the nozzle assembly includes a second three-way valve, a third three-way valve group, and a nozzle, wherein the second three-way valve is connected to the first three-way valve and the third three-way valve group, and the third three-way valve group is connected to the nozzle.

[0015] Optionally, the printer further includes an ink cartridge and an ink stack, the third three-way valve assembly is also connected to the ink cartridge, and the printhead is also connected to the ink stack.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] This application embodiment features a liquid addition metering component, ensuring that the amount of liquid injected each time is a fixed value. This helps avoid waste due to excessive liquid supply and reduced effectiveness due to insufficient liquid supply. By setting a limiting structure and a liquid inlet, liquid is supplied through the inlet, and the supplied liquid drives the piston to move. When the piston moves a distance A, it cannot continue to move due to being blocked by the limiting structure. At this point, the amount of liquid injected is the volume of the receiving tank from the bottom of the receiving tank to the distance A from the bottom of the receiving tank. By limiting the size of the receiving tank, the amount of liquid injected each time is a fixed value, ensuring that the amount of liquid output by the structure each time is the same volume. At the same time, there is no situation where the inability to accurately output a metered amount of liquid is due to the dimensional tolerance of the water pump components or the motor speed tolerance. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a planar structural diagram of a liquid addition metering component provided in an embodiment of this application.

[0022] Figure 2 This is a cross-sectional structural diagram of a liquid addition metering component provided in an embodiment of this application.

[0023] Figure 3 This is a cross-sectional view of a liquid addition metering component provided in an embodiment of this application after liquid injection.

[0024] Figure 4 This is a simplified structural diagram of a printer provided in an embodiment of this application.

[0025] Figure 5 This is a perspective view of an ink stack, an ink stack assembly adapter, an ink stack maintenance seat adapter, a waste ink pump adapter, and a fourth three-way valve, provided for embodiments of this application.

[0026] Figure 6 An exploded view of an ink stack, an ink stack component adapter pipe, an ink stack maintenance seat adapter pipe, a waste ink pump adapter pipe, and a fourth three-way valve provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Liquid dispensing metering component; 2. Tank body; 3. Piston component; 4. Receiving tank cover; 5. Limiting structure; 6. Receiving tank; 7. Liquid inlet; 8. Piston body; 9. Elastomer; 10. Through port; 11. Piston column; 12. Piston head; 13. Abutment component; 14. Liquid supply section; 15. Liquid extraction section; 16. First three-way valve; 18. Second three-way valve; 19. Ink cartridge; 20. Third three-way valve assembly; 21. Printhead assembly; 22. Ink stack; 24. Fourth three-way valve; 25. Waste ink pump; 26. Waste ink cartridge; 27. Ink stack assembly; 28. Scraper assembly; 29. ​​Ink stack maintenance seat; 30. Ink stack assembly adapter pipe; 31. Ink stack maintenance seat adapter pipe; 32. Waste ink pump adapter pipe; 33. Negative pressure detection device; 34. Printhead. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0032] To address the technical problems in the prior art, this application provides a printer that, by setting a limiting structure and a liquid inlet, supplies liquid through the inlet. The supplied liquid drives a piston to move. When the piston moves a distance A, it is blocked by the limiting structure and cannot continue moving. At this point, the amount of liquid injected is the volume of the container from the lowest liquid level to the distance A from the lowest liquid level. By limiting the size of the container, the amount of liquid injected each time is a fixed value, ensuring that the amount of liquid output by the structure each time is the same. This also eliminates the problem of inaccurate liquid output due to dimensional tolerances of pump components or motor speed tolerances. It also helps to avoid waste caused by providing too much liquid and reduced effect caused by providing too little liquid.

[0033] Figure 1-3 A liquid dispensing metering component 1 provided in this application embodiment is used to provide the same volume of liquid each time. It includes a barrel body 2, a piston 3, a receiving tank cover 4, and a limiting structure 5. A receiving tank 6 is provided at one end of the barrel body 2, and a liquid inlet 7 communicating with the receiving tank 6 is provided at the bottom of the barrel body 2. At least part of the piston 3 (for example, the piston head 12 in this embodiment) is received in the receiving tank 6 and matches the shape and size of the cross-section of the receiving tank 6 and can move along the inner wall of the receiving tank 6. The piston 3, which matches the cross-section of the receiving tank 6, can also seal with the receiving tank 6 when moving to prevent liquid leakage from the receiving tank 6 and the piston 3. The receiving tank 6 has an opening. The receiving tank cover 4 seals the opening of the receiving tank 6 and is fixedly connected to the receiving tank 6. The limiting structure 5 is fixedly disposed in the receiving tank 6, specifically fixedly disposed on the side of the receiving tank cover 4 near the bottom of the receiving tank 6.

[0034] The working principle of this invention is as follows: An external liquid supply mechanism injects liquid into the liquid adding metering component 1 through the liquid inlet 7. The liquid enters and provides thrust to the piston 3, causing the piston 3 to move away from the bottom of the receiving tank 6. The distance A between the limiting structure 5 and the bottom of the receiving tank 6 is 1. When the piston 3 has moved a distance A, it is stopped by the limiting structure 5 and cannot continue to move. At this time, a certain amount of liquid has accumulated in the receiving tank 6. The volume of the liquid is the volume of the receiving tank 6 from the bottom of the receiving tank 6 to the distance A from the bottom of the receiving tank 6. The liquid adding metering component 1 provides a precise amount of liquid by outputting the stored metered liquid. Precise metering is achieved through the simple constraint structure between the limiting structure 5 and the piston 3. There is no situation where the metered liquid cannot be accurately output due to the dimensional tolerance of the water pump components or the speed tolerance of the motor. Specifically, the specific value of the distance A can be determined according to the volume of the liquid to be metered and the shape and size of the receiving tank 6.

[0035] Furthermore, the piston component 3 includes a piston body 8 and an elastic body 9. The elastic body 9 is sleeved on the piston body 8, with one end abutting against the piston body 8 and the other end abutting against the receiving groove cover 4. A passage 10 is provided in the middle of the receiving groove cover 4, matching the shape and size of the end of the piston body 8 away from the bottom of the receiving groove 6. Part of the piston body 8 extends out of the receiving groove 6 through the passage 10. The limiting structure 5 is provided around the passage 10. When the piston body 8 contacts the bottom of the receiving groove 6, it is in a slightly compressed state, so that liquid can be easily injected, and it has a certain rebound force so that it reacts on the piston body 8 to push the liquid out. Preferably, the elastic body 9 of this utility model is a spring structure, which has the advantages of stable performance and long-term use. It can also be a hollow column structure made of elastic rubber material, etc.

[0036] In this invention, the barrel 2 is preferably cylindrical, which has the advantages of regular structure, easy volume determination, and smooth sidewalls that facilitate the movement of the piston 3. It can also be prismatic, elliptical, or other regular shapes to facilitate the movement of the piston 3 and volume calculation. The cover 4 of the receiving groove can prevent stains from entering the inner wall of the receiving groove 6 from the opening, which is beneficial to improving the cleanliness and service life of the product. The piston 3 is used to push the piston 3 back after being pushed by the liquid, so that the piston 3 can push the liquid back, realizing the output of a quantitative liquid without the need for an additional push mechanism, which simplifies the structure and improves reliability.

[0037] Furthermore, the piston body 8 includes a piston rod 11 and a piston head 12. The piston head 12 is fixedly connected to one end of the piston rod 11. The shape and size of the cross-section of the piston head 12 match the shape and size of the cross-section of the receiving groove 6. The shape and size of the cross-section of the piston rod 11 match the shape and size of the through port 10. The piston head 12 is compressibly disposed within the receiving groove 6 and seals against the inner wall of the receiving groove 6. Part of the piston rod 11 extends out of the receiving groove 6 from the through port 10. The partially protruding piston rod 11 is used to restrict the direction of movement in conjunction with the through port 10, based on the piston head 12, to prevent the piston head 12 and piston rod 11 from deviating in their direction of movement, which could lead to structural loosening and improve the product's service life. The piston head 11 can be made of rubber.

[0038] Furthermore, an abutment member 13 is fixedly provided on the side of the piston column 11. The abutment member 13 is used to abut against the elastic body 9 and the limiting structure 5. Specifically, the dimension of the abutment member 13 in the cross-section of the piston column 11 is larger than the dimension of the elastic body 9. One end of the elastic body 9 abuts against the abutment member 13, and the other end abuts against the receiving groove cover 4. In this utility model, the limiting structure 5 is a hollow column structure covering the outside of the through port 10. The dimension of the limiting structure 5 in the cross-section of the piston column 11 is larger than the dimension of the elastic body 9 and smaller than the dimension of the abutment member 13. That is, the limiting structure 5 can contain part of the elastic body 9 at one end of the receiving groove cover 4, so as to achieve abutment against the abutment member 13. While the three-phase contact also protects the elastomer 9, it prevents damage caused by excessive deformation in the circumferential direction when the elastomer 9 is compressed, thus extending the service life of the elastomer 9. Furthermore, the contact with the contact member 13 helps to correct the movement posture of the piston body 8. This ensures that the piston body 8, which may have a slight tilt, is aligned after the contact member 13 contacts the hollow cylindrical limiting structure 5, aligning its retraction direction with the extension direction of the receiving groove 6. This reduces the possibility of leakage and increased friction with the inner wall of the receiving groove 6, which could damage the piston head 12. This helps to reduce maintenance costs and extend the product's service life. It is understood that the limiting structure 5 can also be a single or multiple small cylindrical structures located outside the passage 10, including but not limited to these, as long as the limiting structure 5 abuts against the contact member 13 when the piston column 11 moves away from the receiving groove 6.

[0039] Please see Figure 4-6The present invention also provides a printer, including the above-mentioned liquid dispensing metering component 1, as well as a liquid supply unit 14, a liquid extraction unit 15, a first three-way valve 16, and a printhead assembly 21. The liquid extraction unit 15 is connected to the liquid supply unit 14 and the first three-way valve 16 respectively. The first three-way valve 16 is also connected to the printhead assembly 21 and the liquid dispensing metering component 1 respectively. The liquid extraction unit 15 extracts liquid from the liquid supply unit 14 and provides it to the liquid dispensing metering component 1 through the first three-way valve 16. The liquid dispensing metering component 1 provides the same volume of liquid to the printhead assembly 21 each time through the first three-way valve 16.

[0040] In this printer, there are two liquid supply units 14, two liquid addition metering components 1, two liquid extraction units 15 and two first three-way valves 16, which correspond to each other. The liquid supply units 14 provide cleaning fluid and / or moisturizing fluid to the liquid addition metering components 1, and the liquid addition metering components 1 provide cleaning fluid and / or moisturizing fluid according to the needs of the printhead assembly 21.

[0041] Furthermore, the printer also includes an ink cartridge 19 and an ink stack 22. The printhead assembly 21 includes a second three-way valve 18, a third three-way valve group 20, and a printhead 34. The second three-way valve 18 is connected to two first three-way valves 16 and the third three-way valve group 20, respectively. The third three-way valve group 20 is also connected to the ink cartridge 19 and the printhead 34, respectively. The printhead 34 is also connected to the ink stack 22. The first three-way valves 16 are also connected to the liquid extraction section 15 and the liquid dispensing and metering component 1, respectively. Ink supply and cleaning fluid and / or humidifying fluid to the printhead 34 can be achieved by controlling the switching of the passages of the first three-way valves 16, the second three-way valves 18, and the third three-way valves.

[0042] Furthermore, the printer also includes a waste ink recovery assembly (unlabeled), which comprises a fourth three-way valve 24, a waste ink pump 25, and a waste ink cartridge 26. Two ports of the fourth three-way valve 24 are connected to the ink stack 22, and the other port is connected to the waste ink pump 25. The ink stack 22 is connected to the printhead 34. The waste ink pump 25 extracts waste ink from the ink stack 22 through the fourth three-way valve 24, reducing the possibility of waste ink accumulation and sedimentation causing corrosion and blockage of the ink stack 22, thus extending its service life. Timely waste ink recovery also prevents the indiscriminate volatilization of waste ink and environmental pollution. The waste ink cartridge 26 is connected to the waste ink pump 25 and is used to collect the waste ink extracted by the pump 25. The waste ink cartridge 26 enables centralized collection of waste ink extracted by the pump 25, facilitating centralized cleaning and reuse of the collected waste ink by staff.

[0043] Please continue reading. Figure 4Two liquid supply sections 14 are fixedly installed at both ends of the waste ink box 26, providing a more stable environment for the smaller liquid supply sections 14. This helps reduce the possibility of the liquid supply sections 14 tipping over or spilling liquid. It also makes it easier for staff to monitor the remaining amount of cleaning fluid and / or moisturizing fluid and the amount of waste ink stored, reducing the occurrence of situations where the cleaning fluid and / or moisturizing fluid is used up and not replenished in time, or waste ink overflows, due to scattered installation and missed checks.

[0044] Furthermore, the ink stack 22 includes an ink stack assembly 27, a scraper assembly 28, and an ink stack maintenance seat 29. The ink stack assembly 27 is connected to the ink stack maintenance seat 29, and the scraper assembly 28 is also disposed on the ink stack maintenance seat 29 and adjacent to the ink stack assembly 27. A fourth three-way valve 24 is connected to the ink stack assembly 27, the ink stack maintenance seat 29, and the waste ink pump 25. When in operation, the fourth three-way valve 24 is controlled by an external control mechanism connected to it to achieve communication between the ink stack assembly 27 and the waste ink pump 25 or between the ink stack maintenance seat 29 and the waste ink pump 25. When in operation, the waste ink pump 25 extracts waste ink from the ink stack assembly 27 and the ink stack maintenance seat 29 through the fourth three-way valve 24. The scraper assembly 28 is used to scrape off the ink remaining in the printhead 34.

[0045] In this invention, the fourth three-way valve 24 isolates the waste ink pump 25 from the ink stack maintenance seat 29 when it is pumping waste ink from the ink stack assembly 27. This helps maintain a relatively sealed environment, making it easier for the waste ink pump 25 to pump internally and create a negative pressure environment to extract waste ink from the ink stack assembly 27. Similarly, the waste ink pump 25 isolates the waste ink pump 25 from the ink stack assembly 27 when it is pumping waste ink from the ink stack maintenance seat 29. This helps maintain a relatively sealed environment, making it easier for the waste ink pump 25 to pump internally and create a negative pressure environment to extract waste ink from the ink stack maintenance seat 29.

[0046] Furthermore, the printer also includes an ink stack assembly adapter 30, an ink stack maintenance seat adapter 31, and a waste ink pump adapter 32. The ink stack assembly adapter 30 is connected to the ink stack assembly 27 and the fourth three-way valve 24, respectively. The ink stack maintenance seat adapter 31 is connected to the ink stack maintenance seat 29 and the fourth three-way valve 24, respectively. The ink stack maintenance seat 29 is connected to the fourth three-way valve 24 through the ink stack maintenance seat adapter 31. The waste ink pump adapter 32 is connected to the waste ink pump 25 and the fourth three-way valve 24, respectively. The waste ink pump 25 is connected to the fourth three-way valve 24 through the waste ink pump adapter 32.

[0047] Furthermore, the printer in this invention also includes a negative pressure detection device 33, which is connected to the pipeline connecting the waste ink pump 25 and the fourth three-way valve 24. The negative pressure detection device 33 is used to detect the sealing condition between the waste ink pump 25 and the ink stack assembly 27 or the ink stack maintenance seat 29. When the waste ink pump 25 is operating, it needs to maintain a certain negative pressure state. When the ink stack assembly 27 and the ink stack maintenance seat 29 are sealed to the waste ink pump 25, the negative pressure detection device 33 detects that the air pressure between the waste ink pump 25 and the ink stack assembly 27, and between the waste ink pump 25 and the ink stack maintenance seat 29, is negative, allowing the waste ink pump 25 to smoothly extract waste ink from the ink stack 22. When the ink stack assembly 27 or the ink stack maintenance seat 29 is sealed to the ink stack 22, the negative pressure detection device 33 detects that the air pressure between the waste ink pump 25 and the ink stack assembly 27, and between the waste ink pump 25 and the ink stack maintenance seat 29, is negative, allowing the waste ink pump 25 to smoothly extract waste ink from the ink stack 22. When the waste ink pump 25 and the waste ink pump 29 are not in a sealed state, the negative pressure detection device 33 detects that the air pressure between the waste ink pump 25 and the ink stack assembly 27, and between the waste ink pump 25 and the ink stack 22 connection seat is at normal pressure. This makes it difficult for the waste ink pump 25 to extract the waste ink. The staff can understand the sealing status between the waste ink pump 25 and the ink stack assembly 27, and the ink stack maintenance seat 29 based on the pressure data displayed by the negative pressure detection device 33, so as to carry out maintenance in a timely manner and avoid the situation where the waste ink is not extracted in time due to the low working efficiency of the waste ink pump 25.

[0048] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one 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 this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0055] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A printer, characterized in that: The system includes a liquid supply unit, a liquid extraction unit, a liquid addition metering component, a first three-way valve, and a nozzle assembly. The liquid extraction unit is connected to the liquid supply unit and the first three-way valve, respectively. The first three-way valve is also connected to the liquid addition metering component and the nozzle assembly. The liquid extraction unit extracts liquid from the liquid supply unit and supplies it to the liquid addition metering component through the first three-way valve. The liquid addition metering component supplies the same volume of liquid to the nozzle assembly each time through the first three-way valve.

2. The printer according to claim 1, characterized in that: The liquid addition metering component includes a barrel and a piston. One end of the barrel is provided with a receiving groove. At least part of the piston is received in the receiving groove and matches the shape and size of the cross-section of the receiving groove and can move along the inner wall of the receiving groove. The bottom of the barrel is provided with a liquid inlet communicating with the receiving groove.

3. The printer according to claim 2, characterized in that: It also includes a receiving groove cover, the receiving groove having an opening, the receiving groove cover sealing the opening of the receiving groove, and a passage opening in the middle of the receiving groove cover that matches the shape and size of the piston component away from the bottom of the receiving groove.

4. The printer according to claim 3, characterized in that: The piston assembly includes a piston body and an elastic body. The elastic body is sleeved on the piston body, with one end abutting against the piston body and the other end abutting against the receiving groove cover.

5. The printer according to claim 4, characterized in that: The piston body includes a piston rod and a piston head. The piston head is fixedly connected to one end of the piston rod. The shape and size of the cross-section of the piston head match the shape and size of the cross-section of the receiving groove. The shape and size of the cross-section of the piston rod match the shape and size of the through-hole. The piston head is disposed in the receiving groove and is sealed to the inner wall of the receiving groove. The piston rod portion extends out of the receiving groove from the through-hole.

6. The printer according to claim 5, characterized in that: An abutment is fixedly provided on the side of the piston rod. The size of the abutment on the cross-section of the piston rod is larger than the size of the elastic body. One end of the elastic body abuts against the abutment and the other end abuts against the receiving groove cover.

7. The printer according to claim 6, characterized in that: A limiting structure is fixedly provided in the receiving groove. The limiting structure is fixedly provided on one side of the receiving groove cover near the bottom of the receiving groove. The limiting structure is provided on the periphery of the passage. The limiting structure abuts against the abutting member when the piston rod moves away from the receiving groove.

8. The printer according to claim 7, characterized in that: The limiting structure is a hollow cylindrical structure covering the outside of the passage. The dimension of the limiting structure on the cross-section of the piston column is larger than the dimension of the elastic body and smaller than the dimension of the abutment.

9. The printer according to claim 1, characterized in that: It also includes a waste ink recycling component, which includes a waste ink cartridge and is fixedly connected to the liquid supply unit.

10. The printer according to claim 1, characterized in that: The nozzle assembly includes a second three-way valve, a third three-way valve group, and a nozzle. The second three-way valve is connected to the first three-way valve and the third three-way valve group, respectively, and the third three-way valve group is connected to the nozzle.

11. The printer according to claim 10, characterized in that: It also includes ink cartridges and ink stacks, the third three-way valve assembly is also connected to the ink cartridges, and the printhead is also connected to the ink stacks.

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