Liquid spraying device

Abstract

The invention provides a liquid spraying device which comprises a machine body, a printing head and an ink scraping assembly are arranged in the machine body, the printing head is provided with a nozzle and protruding parts located on the two sides of the nozzle, the ink scraping assembly comprises at least one scraper, and the scraper can reciprocate relative to the printing head. The scraper comprises a first contact part and first avoiding parts located at the two ends of the first contact part, and a first groove is formed between the first contact part and the first avoiding parts. A second contact part is further arranged at one end, deviating from the first contact part, of the first avoiding part; and a second groove is formed between the first avoiding part and the second contact part. In the length direction of the liquid spraying device, the nozzle is located in the projection range of the first contact part, the protruding parts are located in the projection range of the first avoiding part, and the area between the ends, away from each other, of the protruding parts and the end of the printing head is located in the projection range of the second contact part. When the scraper moves relative to the printing head, the first contact part is not affected by the protruding part and is tightly attached to the nozzle area, and the ink scraping effect is guaranteed.

Description

Technical Field

[0001] This application relates to the field of inkjet printing technology, specifically to a liquid ejection device. Background Technology

[0002] Liquid ejection devices (such as inkjet printers) have removable ink cartridges and printheads installed inside. They record images and text by ejecting tiny droplets of ink from the nozzles of the printhead onto printing media such as paper. When the printhead nozzles eject these tiny ink droplets, a small amount of ink adheres to the surface of the nozzles. After a printing job is completed, if this ink is not removed promptly, the water and other volatile components in the ink will evaporate, and the ink will solidify on the nozzle surface, clogging the nozzles. This prevents fresh ink droplets from being ejected properly during the next print run, ultimately affecting print quality.

[0003] To address this issue, existing liquid ejection devices incorporate a maintenance module, primarily consisting of a doctor blade mechanism and a sealing cap. After printing, the doctor blade is used to remove residual ink from the nozzle surface. When the doctor blade removes this ink, it's crucial to ensure a tight seal between the blade and the nozzle area. However, there are adhesive protrusions at the printhead. As the doctor blade passes over these protrusions, they lift the blade, creating gaps. This prevents the nozzle area near the protrusions from contacting the blade, thus affecting the ink removal performance. Summary of the Invention

[0004] In view of this, this application provides a liquid ejection device to help solve the technical problem of poor ink scraping effect of the doctor blade in the prior art.

[0005] This application provides a liquid ejection device, which has a body, a print head and a scraper assembly disposed within the body, the print head having a nozzle and protrusions located on both sides of the nozzle, and the scraper assembly including at least one scraper blade capable of reciprocating relative to the print head. The scraper includes a first contact portion and first clearance portions located at both ends of the first contact portion, with a first groove between the first contact portion and the first clearance portions; a second contact portion is also provided at the end of the first clearance portion opposite to the first contact portion, with a second groove between the first clearance portion and the second contact portion; along the length direction of the liquid ejection device, the nozzle is located within the projection range of the first contact portion, the protrusion is located within the projection range of the first clearance portion, and the area between the opposite ends of the protrusion and the end of the print head is located within the projection range of the second contact portion.

[0006] In this embodiment, when relative movement occurs between the scraper and the printhead, the first contact portion of the scraper is unaffected by the protrusion, ensuring a tight fit between the first contact portion and the nozzle area and preventing the protrusion from affecting the ink scraping effect. Specifically, when relative movement occurs between the scraper and the printhead, the first contact portion fits against the nozzle area to scrape off residual ink on the nozzle surface, and the first clearance portion fits against the protrusion to scrape off residual ink on the surface of the protrusion. Furthermore, because a first groove is provided between the first contact portion and the first clearance portion, when the first clearance portion is lifted by the protrusion, the first contact portion is unaffected and maintains a tight fit with the nozzle area, ensuring the effective ink scraping of the nozzle area by the first contact portion. Meanwhile, the scraper may also include a second contact portion for scraping the area between the opposite ends of the protrusions and the end of the print head. A second groove may also be provided between the first clearance portion and the second contact portion. Therefore, when the first clearance portion is lifted by the protrusion, the second contact portion is not affected and always remains in close contact with the area outside the protrusion. This allows the scraper to scrape ink on the entire area of ​​the print head, thereby improving the ink scraping effect.

[0007] In one specific embodiment, along the length direction of the liquid ejection device, the first contact portion has a first contact end and a second contact end disposed opposite to each other; the length L1 of the first contact end is less than the length L2 of the second contact end.

[0008] In one specific embodiment, along the width direction of the liquid ejection device, the length L1 of the first contact end is greater than the length L3 of the nozzle, and the length L2 of the second contact end is less than the distance D1 between the two protrusions.

[0009] In one specific embodiment, the first contact portion further includes a second clearance portion, which is disposed at both ends of the first contact end so that the length of the first contact end is less than the length of the second contact end.

[0010] In one specific embodiment, the difference between the length L1 of the first contact end and the length L3 of the nozzle satisfies 0.8mm≤L1-L3≤1.0mm, and the difference between the length L2 of the second contact end and the length L3 of the nozzle satisfies 1.6mm≤L2-L3≤1.8mm.

[0011] In one specific embodiment, along the direction of movement of the scraper, the length L4 of the second clearance portion is greater than the height of the protrusion.

[0012] In one specific embodiment, the liquid ejection device further includes a printing area, and the doctor blade assembly further includes an adsorption element for adsorbing residual ink on the doctor blade; the adsorption element is disposed on the side of the doctor blade facing the printing area.

[0013] In one specific embodiment, along the height direction of the liquid ejection device, the top of the scraper is higher than the top of the adsorption element.

[0014] In one specific embodiment, the scraper further includes a first mounting portion, and the scraper assembly further includes a mounting base having a first mounting groove; the scraper is mounted in the first mounting groove via the first mounting portion; the mounting base also has a second mounting groove on the side facing the printing area, and the suction member is mounted in the second mounting groove.

[0015] In one specific embodiment, the first mounting part has a positioning hole, and the side wall of the first mounting groove has a first positioning post, the positioning hole being able to cooperate with the first positioning post; the ink scraping assembly further includes a pressure plate, the pressure plate including a second mounting part and a fixing part, the pressure plate being mounted in the first mounting groove through the second mounting part, and the fixing part abutting against the side wall of the first mounting part.

[0016] In one specific embodiment, the first mounting portion has a positioning hole; the ink scraper assembly further includes a pressure plate, the pressure plate includes a second mounting portion and a fixing portion, the pressure plate is mounted in the first mounting groove through the second mounting portion; the second mounting portion has a second positioning post, the positioning hole can cooperate with the second positioning post; the fixing portion abuts against the side wall of the first mounting portion.

[0017] In one specific embodiment, the cross-sectional area of ​​the fixing part is larger than the cross-sectional area of ​​the second mounting part.

[0018] In one specific embodiment, the printhead includes a first printhead and a second printhead spaced apart along the length of the liquid ejection device, and the scraper includes a first scraper and a second scraper; along the length of the liquid ejection device, the nozzle and the protrusion of the first printhead are respectively located within the projection range of the first contact portion and the first clearance portion of the first scraper; the nozzle and the protrusion of the second printhead are respectively located within the projection range of the first contact portion and the first clearance portion of the second scraper. Attached Figure Description

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

[0020] Figure 1This is a schematic diagram of the structure of the liquid ejection device provided in this application in a specific embodiment; Figure 2 for Figure 1 Schematic diagram of the middle scraper; Figure 3 for Figure 1 A schematic diagram of the printhead structure; Figure 4 for Figure 1 A schematic diagram of the scraper and print head in one specific embodiment; Figure 5 for Figure 1 A schematic diagram of the scraper and print head in another specific embodiment; Figure 6 for Figure 5 A magnified view of part I in the middle; Figure 7 for Figure 1 A schematic diagram of the scraper and print head in yet another specific embodiment; Figure 8 for Figure 7 A magnified view of a section II; Figure 9 for Figure 2 A bottom view; Figure 10 for Figure 1 Exploded view of the mounting base, scraper, pressure plate, and suction component; Figure 11 for Figure 10 Schematic diagram of the mounting base and scraper; Figure 12 for Figure 10 Schematic diagram of the structure of the medium-pressure tablet; Figure 13 for Figure 1 A schematic diagram of the structure of the mounting base, scraper, and pressure plate in another specific embodiment; Figure 14 for Figure 1 A schematic diagram of the printhead in another specific embodiment.

[0021] Figure label: 1-The body; 2-Print head; 21- Nozzle; 22-Protrusion; 23 - First printhead; 24 - Second printhead; 3-Scraper assembly; 31-Scraper; 311 - First contact part; 311a - First contact terminal; 311b - Second contact terminal; 311c - Second Avoidance Section; 312 - First Escape Section; 313 - First groove; 314 - Second contact part; 315 - Second groove; 316 - First Installation Section; 316a - Positioning hole; 317 - First scraper; 318 Second Scraper; 32 - Adsorption element; 33 - Mounting base; 331 - First mounting slot; 331a - First positioning post; 332 - Second mounting slot; 34- tableting; 341 - Second Installation Section; 341a - Second positioning post; 342 - Fixing part; 4 - Printing area. Detailed Implementation

[0022] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0024] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Liquid ejection devices (such as inkjet printers) have a printhead that records images and text by ejecting tiny droplets of ink from the nozzles of the printhead onto a printing medium such as paper. When the printhead nozzles eject these tiny ink droplets, a small amount of ink adheres to the surface of the nozzles. Existing liquid ejection devices also include a maintenance module, which mainly consists of a scraper mechanism and a sealing cap. After printing, the scraper mechanism removes residual ink from the nozzle surface. When the scraper blade removes residual ink from the nozzle surface, it is necessary to ensure a tight seal between the scraper blade and the nozzle area. However, the electrical connections on the printhead surface need to be sealed using methods such as adhesive to prevent moisture ingress. Therefore, the printhead has raised sections formed by adhesive. When the scraper blade passes over these raised sections, it lifts the blade, creating a gap. This prevents the nozzle area near the raised section from contacting the scraper blade, thus affecting the scraping effect.

[0027] To solve the above technical problems, such as Figures 1 to 4 As shown, this application embodiment provides a liquid ejection device, which may include a body 1, a print head 2 and a scraper assembly 3 disposed inside the body 1. The print head 2 may be provided with a nozzle 21 and protrusions 22 located on both sides of the nozzle 21. The scraper assembly 3 may include at least one scraper 31, which is capable of reciprocating relative to the print head 2.

[0028] The scraper 31 includes a first contact portion 311 and first clearance portions 312 located at both ends of the first contact portion 311. A first groove 313 is provided between the first contact portion 311 and the first clearance portions 312. A second contact portion 314 is also provided at the end of the first clearance portion 312 opposite to the first contact portion 311. A second groove 315 is provided between the first clearance portion 312 and the second contact portion 314. Along the length direction X of the liquid ejection device, the nozzle 21 is located within the projection range of the first contact portion 311, the protrusion 22 is located within the projection range of the first clearance portion 312, and the area between the opposite ends of the protrusion 22 and the end of the print head 2 is located within the projection range of the second contact portion 314.

[0029] With this design, when there is relative movement between the scraper 31 and the printhead 2, the first contact portion 311 of the scraper 31 is not affected by the protrusion 22, ensuring that the first contact portion 311 fits tightly with the nozzle 21 area and avoiding the protrusion 22 from affecting the ink scraping effect.

[0030] Specifically, when relative movement occurs between the scraper 31 and the print head 2, the first contact portion 311 is in contact with the nozzle 21 area to scrape off residual ink on the surface of the nozzle 21, and the first clearance portion 312 is in contact with the protrusion 22 to scrape off residual ink on the surface of the protrusion 22. Since a first groove 313 is provided between the first contact portion 311 and the first clearance portion 312, when the first clearance portion 312 is lifted by the protrusion 22, the first contact portion 311 is not affected and always maintains a tight fit with the nozzle 21 area, ensuring the scraping effect of the first contact portion 311 on the nozzle 21 area. Meanwhile, the scraper 31 may also include a second contact portion 314 for scraping the area between the opposite ends of the protrusions and the end of the print head. A second groove 315 may also be provided between the first clearance portion 312 and the second contact portion 314. Therefore, when the first clearance portion 312 is lifted by the protrusion 22, the second contact portion 314 is also unaffected and always remains in close contact with the area outside the protrusion 22, so that the scraper 31 can perform ink scraping treatment on the entire area of ​​the print head 2 to improve the ink scraping effect.

[0031] In this embodiment, the direction of relative movement between the scraper 31 and the print head 2 can be parallel to the length direction X of the liquid ejection device.

[0032] In the above embodiments, such as Figures 1 to 4 As shown, during the use of the scraper 31, along the length direction X of the liquid spraying device, the center position of the scraper 31 is set to be aligned with the center position of the nozzle 21 (e.g., Figure 4 (As shown by the dotted line in the image), to ensure that the first contact part 311 corresponds to the area of ​​the nozzle 21, the first avoidance part 312 corresponds to the protrusion 22, and the second contact part 314 corresponds to the area outside the protrusion 22. However, in actual use, due to the concentrated error of the components during installation or the positional shift caused by long-term use, the center position of the scraper 31 is shifted relative to the center position of the nozzle 21. Taking the scraper 31 shifting to the left relative to the print head 2 as an example: when the scraper 31 moves relative to the print head 2, the leftmost end of the first contact part 311 will pass through the protrusion 22, causing the leftmost end to be lifted by the protrusion 22. As a result, the first contact part 311 cannot effectively scrape the leftmost area of ​​the nozzle 21, and the rightmost end of the first contact part 311 also cannot cover the rightmost area of ​​the nozzle 21 due to the positional shift, which seriously affects the overall scraping effect of the print head 2.

[0033] To solve the above technical problems, such as Figure 2 , Figures 5 to 8 As shown, along the length direction X of the liquid ejection device, the first contact portion 311 may also have a first contact end 311a and a second contact end 311b disposed opposite to each other. The length L1 of the first contact end 311a is less than the length L2 of the second contact end 311b.

[0034] With this design, even if the center position of the scraper 31 is offset from the center position of the nozzle 21 (such as...), Figure 6 As shown by the dashed line, the ink scraping effect on the printhead 2 is still guaranteed. Specifically, taking the scraper 31 offset to the left relative to the nozzle 21 as an example: when the scraper 31 and the printhead 2 move relative to each other in the first direction, the first contact end 311a is in contact with the nozzle 21. Since the length of the first contact end 311a is small, there is still a gap between the leftmost side of the first contact end 311a and the protrusion 22, and it will not be pushed up by the protrusion 22, thus ensuring the ink scraping effect of the first contact end 311 on the leftmost area of ​​the nozzle 21. At this time, because the length of the first contact end 311a is small and it is offset to the left, the first contact end 311a may not be able to scrape the residual ink in the rightmost area of ​​the nozzle 21. When the scraper 31 and the print head 2 move relative to each other in the second direction, the second contact end 311b comes into contact with the nozzle 21. Since the second contact end 311b is relatively long, the rightmost side of the second contact end 311b can scrape off the residual ink in the rightmost area of ​​the nozzle 21. In summary, by setting the first contact end 311a and the second contact end 311b of different lengths on the first contact portion 311 of the scraper 31, the ink scraping effect on the nozzle 21 area of ​​the print head 2 can be guaranteed after the position of the scraper 31 is offset.

[0035] In this embodiment, the first direction and the second direction are the directions in which the scraper 31 and the print head 2 move relative to each other, that is, they are parallel to the length direction X of the liquid ejection device, and the directions of the first direction and the second direction are opposite.

[0036] In the above embodiments, such as Figure 3 , Figure 4 and Figure 9 As shown, along the width direction Y of the liquid ejection device, the length L1 of the first contact end 311a is greater than the length L3 of the nozzle 21, and the length L2 of the second contact end 311b is less than the distance D1 between the two protrusions 22.

[0037] With this design, when the center position of the scraper 31 corresponds to the center position of the nozzle 21, the length L1 of the first contact end 311a is greater than the length L3 of the nozzle 21. This allows the first contact end 311a to cover the entire area of ​​the nozzle 21, enabling it to scrape away residual ink from the entire area of ​​the nozzle 21 when the scraper 31 and the print head 2 move relative to each other in the first direction. Simultaneously, the length L2 of the second contact end 311b is less than the distance D1 between the two protrusions 22. This prevents the second contact end 311b from being too long and causing some areas of the protrusions 22 at both ends to be lifted up by the protrusions 22, thus affecting the ink scraping effect on the area of ​​the nozzle 21 near the protrusions 22.

[0038] In the above embodiments, such as Figure 2 , Figures 5 to 8 As shown, the first contact portion 311 may also have a second clearance portion 311c, which is disposed at both ends of the first contact end 311a so that the length of the first contact end 311a is less than the length of the second contact end 311b.

[0039] This design allows the first contact end 311a to have second clearance portions 311c at both ends, ensuring that the length of the first contact end 311a is less than the length of the second contact end 311b. Furthermore, by providing the second clearance portions 311c, the protrusion 22 can be accommodated within them. Specifically, when the center position of the scraper 31 shifts relative to the center position of the print head 2, and when the scraper 31 and the print head 2 move relative to each other along the first direction, the first contact end 311a contacts the nozzle 21 area. The interference area between the protrusion 22 and the first contact end 311a can be accommodated within the second clearance portion 311c, ensuring that the first contact end 311a remains in close contact with the plane containing the nozzle 21 area.

[0040] In the above embodiments, such as Figure 2 , Figure 3 and Figure 9As shown, the difference between the length L1 of the first contact end 311a and the length L3 of the nozzle 21 satisfies 0.8mm ≤ L1 - L3 ≤ 1.0mm, for example, it can be 0.8mm, 0.9mm, 1.0mm, etc., so that the first contact end 311a can completely cover the entire area of ​​the nozzle 21. At the same time, the difference between the length L2 of the second contact end 311b and the length L3 of the nozzle 21 satisfies 1.6mm ≤ L2 - L3 ≤ 1.8mm, for example, it can be 1.6mm, 1.7mm, 1.8mm, etc., so that the length of the second contact end 311b is longer. After the center position of the doctor blade 31 is offset relative to the center position of the nozzle 21, the second contact end 311b can still cover the entire area of ​​the nozzle 21, so as to ensure the ink scraping effect of the nozzle 21.

[0041] In the above embodiments, such as Figure 2 and Figure 9 As shown, along the length direction X of the liquid ejection device, the length of the second clearance portion 311c can be greater than the height of the protrusion 22.

[0042] With this design, when part of the structure of the protrusion 22 is housed inside the second clearance part 311c, the second clearance part 311c can avoid contact with the protrusion 22, thus preventing the protrusion 22 from affecting the tightness of the first contact end 311a and the plane where the nozzle 21 area is located, which would affect the ink scraping effect of the doctor blade 31.

[0043] In this embodiment, the length of the second avoidance portion 311c can be 0.60mm-0.70mm. For example, the length of the second avoidance portion 311c can be 0.60mm, 0.65mm, 0.70mm, etc., so that the second avoidance portion 311c can avoid the protrusion 22, prevent the protrusion 22 from contacting the scraper 31, and prevent the thickness of the part of the second contact end 311b that is longer than the first contact end 311a from being too thin due to the excessive length of the second avoidance portion 311c, which would prevent effective ink scraping operation.

[0044] In other embodiments, the length of the second avoidance part 311c may also be other values. In this application embodiment, the specific length of the second avoidance part 311c is not limited, and can be adaptively adjusted according to the actual situation.

[0045] In one specific embodiment, such as Figure 1 , Figure 2 and Figure 10 As shown, the liquid ejection device also includes a printing area 4 (i.e., Figure 1 (The area shown within the dashed box). The doctor blade assembly 3 may also include an adsorption element 32 for adsorbing residual ink on the doctor blade 31. The adsorption element 32 may be disposed on the side of the doctor blade 31 facing the printing area 4.

[0046] In this embodiment, by providing an adsorption member 32 for adsorbing residual ink on the doctor blade 31, the doctor blade 31 can be cleaned, preventing residual ink on the surface of the doctor blade 31 from causing reverse contamination to the print head 2 when cleaning the print head 2. Simultaneously, by positioning the adsorption member 32 on the side of the doctor blade 31 facing the printing area 4, even when the adsorption member 32 is positioned between the doctor blade 31 and the printing area 4, it is ensured that when the doctor blade 31 moves relative to the print head 2 in the first or second direction, a portion of the doctor blade 31 can be bent under force and come into contact with the adsorption member 32, allowing the adsorption member 32 to adsorb residual ink on the doctor blade 31.

[0047] In the above embodiments, such as Figure 1 , Figure 2 and Figure 10 As shown, along the height direction Z of the liquid ejection device, the top of the scraper 31 can be higher than the top of the adsorption member 32.

[0048] With this design, when the scraper 31 moves relative to the print head 2, the scraper 31 comes into contact with the print head 2, and the top of the scraper 31 facing away from the print head 2 bends downward. Therefore, the top of the scraper 31 is higher than the top of the suction member 32, which makes it easier for the top of the scraper 31 to contact the suction member 32 after bending downward, so that the suction member 32 can absorb the residual ink on the surface of the scraper 31 and clean the scraper 31.

[0049] In the above embodiments, the adsorption element 32 can be a cleaning sponge. In other embodiments, the adsorption element 32 can also be other components. The specific structural form of the adsorption element 32 is not limited in the embodiments of this application, and can be adapted according to the actual situation.

[0050] In the above embodiments, such as Figure 1 , Figure 2 and Figure 10 As shown, the doctor blade 31 may further include a first mounting portion 316, and the doctor blade assembly 3 may further include a mounting base 33. The mounting base 33 has a first mounting groove 331, and the doctor blade 31 is mounted in the first mounting groove 331 through the first mounting portion 316. The mounting base 33 also has a second mounting groove 332 on the side facing the printing area 4, and the suction member 32 is mounted in the second mounting groove 332.

[0051] In this embodiment, the scraper 31 may include a first mounting portion 316, on which a first contact portion 311, a first clearance portion 312, and a second contact portion 314 are all disposed. The scraper 31 can be mounted in the first mounting groove 331 of the mounting base through the first mounting portion 316, thereby fixing the scraper 31. By providing a second mounting groove 332 on the side of the mounting base 33 facing the printing area 4, the adsorption member 32 is mounted in the second mounting groove 332, thereby fixing the adsorption member 32 and enabling the adsorption member 32 to adsorb residual ink on the scraper 31.

[0052] In one specific embodiment, such as Figure 1 , Figure 2 and Figure 10 As shown, the first mounting part 316 may also have a positioning hole 316a, and the side wall of the first mounting groove 331 may also have a first positioning post 331a, and the positioning hole 316a may cooperate with the first positioning post 331a.

[0053] This design allows the positioning hole 316a of the first mounting part 316 to engage with the first positioning post 331a on the first mounting groove 331, improving the connection reliability between the first mounting part 316 and the first mounting groove 331. This ensures the connection stability between the scraper 31 and the mounting base 33, preventing the scraper 31 from falling off during use. It also provides a guiding function for the installation of the scraper 31.

[0054] In the above embodiments, please also refer to Figure 11 The doctor blade assembly 3 may also include a pressure plate 34, which includes a second mounting part 341 and a fixing part 342. The pressure plate 34 is mounted in the first mounting groove 331 through the second mounting part 341, and the fixing part 342 abuts against the side wall of the first mounting part 316.

[0055] By incorporating a pressure plate 34 into the doctor blade assembly 3, the doctor blade 31 can be further secured. Specifically, the pressure plate 34 may include a second mounting portion 341, allowing it to be mounted within the first mounting groove 331. Furthermore, the fixing portion 342 of the pressure plate 34 can abut against the side wall of the first mounting portion 316, further enhancing the securing effect on the doctor blade 31. This further secures the doctor blade 31 within the first mounting groove 331, preventing obstruction of the areas where the doctor blade 31 contacts the printhead 2, such as the first contact portion 311, the first clearance portion 312, and the second contact portion 314, ensuring the normal operation of the doctor blade 31.

[0056] In another specific embodiment, please also refer to Figure 12The second mounting portion 341 of the tablet 34 may also have a second positioning post 341a, and the positioning hole 316a on the first mounting portion 316 of the scraper 31 may also cooperate with the second positioning post 341a, that is, after the tablet 34 and the scraper 31 are fixed, they are then installed in the first mounting groove 331 simultaneously.

[0057] In the above embodiments, the cross-sectional area of ​​the fixing part 342 can be larger than the cross-sectional area of ​​the second mounting part 341. This design allows the cross-sectional area of ​​the second mounting part 341 to be smaller, facilitating its installation alongside the first mounting part 316 within the first mounting groove 331. Furthermore, the larger cross-sectional area of ​​the fixing part 342 allows it to abut against the side wall of the first mounting part 316, thereby further enhancing the fixing effect on the scraper 31.

[0058] In one specific embodiment, such as Figure 2 , Figure 13 and Figure 14 As shown, the printhead 2 may further include a first printhead 23 and a second printhead 24 arranged at intervals along the length X of the liquid ejection device, and the scraper 31 may include a first scraper 317 and a second scraper 318. Along the length X of the liquid ejection device, the nozzle 21 and protrusion 22 of the first printhead 23 are respectively located within the projection range of the first contact portion 311 and the first clearance portion 312 of the first scraper 317. The nozzle 21 and protrusion 22 of the second printhead 24 are respectively located within the projection range of the first contact portion 311 and the first clearance portion 312 of the second scraper 318.

[0059] In this embodiment, the printhead 2 may include a first printhead 23 and a second printhead 24. For example, the first printhead 23 may be a color printhead, and the second printhead 24 may be a black printhead. Therefore, the scraper 31 may include a first scraper 317 and a second scraper 318, such that the first contact portion 311 and the first clearance portion 312 on the first scraper 317 are respectively configured to correspond to the size of the first printhead 23, and the first contact portion 311 and the first clearance portion 312 on the second scraper 318 are respectively configured to correspond to the size of the second printhead 24, so as to meet the ink scraping requirements of the first printhead 23 and the second printhead 24.

[0060] Please also refer to Figure 10 and Figure 12 As shown, the second mounting part 341 of the pressure plate 34 can be provided with second positioning posts 341a on both sides. The first scraper 317 and the second scraper 318 can be fixedly connected to both sides of the pressure plate 34 before being installed in the first mounting groove 331 of the mounting base 33 to improve the fixing effect of the first scraper 317 and the second scraper 318.

[0061] In addition, an adsorption element 32 can be provided on the side of the first scraper 317 facing the printing area 4, and an adsorption element 32 can also be provided on the side of the second scraper 318 facing the printing area 4, so as to meet the cleaning needs of the first scraper 317 and the second scraper 318 respectively.

[0062] The first scraper 317 and the second scraper 318 can have the same structure as the scraper 31 mentioned in the above embodiments, only differing in size. In other embodiments, there can be two or more printheads 2, and the number of scrapers 31 is also set accordingly to the number of printheads 2, with the size of the scraper 31 adjustable according to the actual size of the printheads 2. In this application embodiment, the specific number of printheads 2 and scrapers 31 in the liquid ejection device is not limited.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid ejection device, characterized in that, The liquid ejection device has a body (1), inside which a print head (2) and a scraper assembly (3) are provided. The print head (2) is provided with a nozzle (21) and protrusions (22) located on both sides of the nozzle (21). The scraper assembly (3) includes at least one scraper (31) which is capable of reciprocating relative to the print head (2). The scraper (31) includes a first contact portion (311) and a first clearance portion (312) located at both ends of the first contact portion (311). A first groove (313) is provided between the first contact portion (311) and the first clearance portion (312). A second contact portion (314) is also provided at one end of the first clearance portion (312) away from the first contact portion (311). A second groove (315) is provided between the first clearance portion (312) and the second contact portion (314). Along the length of the liquid ejection device, the nozzle (21) is located within the projection range of the first contact portion (311), the protrusion (22) is located within the projection range of the first clearance portion (312), and the area between the opposite ends of the protrusion (22) and the end of the print head (2) is located within the projection range of the second contact portion (314).

2. The liquid ejection device according to claim 1, characterized in that, Along the length direction of the liquid ejection device, the first contact portion (311) has a first contact end (311a) and a second contact end (311b) disposed opposite to each other. The length L1 of the first contact end (311a) is less than the length L2 of the second contact end (311b).

3. The liquid ejection device according to claim 2, characterized in that, Along the width direction of the liquid ejection device, the length L1 of the first contact end (311a) is greater than the length L3 of the nozzle (21), and the length L2 of the second contact end (311b) is less than the distance D1 between the two protrusions (22).

4. The liquid ejection device according to claim 3, characterized in that, The first contact portion (311) also has a second clearance portion (311c), which is disposed at both ends of the first contact end (311a) so that the length of the first contact end (311a) is less than the length of the second contact end (311b).

5. The liquid ejection device according to claim 4, characterized in that, The difference between the length L1 of the first contact end (311a) and the length L3 of the nozzle (21) satisfies 0.8mm≤L1-L3≤1.0mm, and the difference between the length L2 of the second contact end (311b) and the length L3 of the nozzle (21) satisfies 1.6mm≤L2-L3≤1.8mm.

6. The liquid ejection device according to claim 4, characterized in that, Along the direction of movement of the scraper (31), the length L4 of the second clearance portion (311c) is greater than the height of the protrusion (22).

7. The liquid ejection device according to any one of claims 1-6, characterized in that, The liquid ejection device also includes a printing area (4). The doctor blade assembly (3) also includes an adsorption element (32) for adsorbing residual ink on the doctor blade (31); the adsorption element (32) is disposed on the side of the doctor blade (31) facing the printing area (4).

8. The liquid ejection device according to claim 7, characterized in that, Along the height direction of the liquid ejection device, the top of the scraper (31) is higher than the top of the adsorption member (32).

9. The liquid ejection device according to claim 8, characterized in that, The scraper (31) further includes a first mounting part (316), and the scraper assembly (3) further includes a mounting base (33), the mounting base (33) having a first mounting groove (331); the scraper (31) is mounted in the first mounting groove (331) through the first mounting part (316); The mounting base (33) is provided with a second mounting groove (332) on the side facing the printing area (4), and the adsorption member (32) is installed in the second mounting groove (332).

10. The liquid ejection device according to claim 9, characterized in that, The first mounting part (316) has a positioning hole (316a), and the side wall of the first mounting groove (331) has a first positioning post (331a), and the positioning hole (316a) can cooperate with the first positioning post (331a). The scraper assembly (3) further includes a pressure plate (34), which includes a second mounting part (341) and a fixing part (342). The pressure plate (34) is mounted in the first mounting groove (331) through the second mounting part (341), and the fixing part (342) abuts against the side wall of the first mounting part (316).

11. The liquid ejection device according to claim 9, characterized in that, The first mounting part (316) has a positioning hole (316a); the doctor blade assembly (3) further includes a pressure plate (34), the pressure plate (34) includes a second mounting part (341) and a fixing part (342), the pressure plate (34) is mounted in the first mounting groove (331) through the second mounting part (341); The second mounting part (341) has a second positioning post (341a), and the positioning hole (316a) can cooperate with the second positioning post (341a); the fixing part (342) abuts against the side wall of the first mounting part (316).

12. The liquid ejection device according to any one of claims 9-10, characterized in that, The cross-sectional area of ​​the fixing part (342) is larger than the cross-sectional area of ​​the second mounting part (341).

13. The liquid ejection device according to any one of claims 1-6, characterized in that, The printhead (2) includes a first printhead (23) and a second printhead (24) arranged at intervals along the length direction of the liquid ejection device. The scraper (31) includes a first scraper (317) and a second scraper (318). Along the length direction of the liquid ejection device, the nozzle (21) and the protrusion (22) of the first printhead (23) are respectively located within the projection range of the first contact portion (311) and the first clearance portion (312) of the first scraper (317). The nozzle (21) and the protrusion (22) of the second printhead (24) are respectively located within the projection range of the first contact portion (311) and the first clearance portion (312) of the second scraper (318).

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