Printing head assembly and printer

Abstract

The invention discloses a printing head assembly and a printer, the printing head assembly comprises a base, a printing head and a paper guide assembly, the printing head is arranged on the base, and the printing head is provided with a printing surface for label paper to pass through; the paper guiding assembly is arranged on the base and comprises a paper guiding piece, the paper guiding piece and the printing head are arranged on the base in a spaced mode in the first direction, the paper guiding piece is provided with a paper guiding face used for guiding label paper to advance, and the paper guiding face is higher than the printing face in the direction perpendicular to the printing face. The paper guiding piece can move along with the label paper relative to the printing head in the first direction when the label paper is fed so as to change the interval between the paper guiding piece and the printing head. According to the embodiment, the label paper can be fed more smoothly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printers, in particular to a print head assembly and a printer. BACKGROUND

[0002] A label refers to a text, graphic symbol and all instructions on a product. Labels are widely used in scenarios such as supermarkets, retail, industrial production, express delivery, clothing and office management. A printer is used to print label paper. In related technologies, a printer includes a print head and a paper guide strip for guiding the paper out. The paper guide strip is arranged at the paper outlet end of the print head. Since the edge position of the paper outlet end of the print head is relatively sharp, the label paper is easily scratched when the label paper is fed back into the printer. Therefore, the arrangement height of the paper guide strip is generally higher than the edge position of the print head. However, such an arrangement easily causes the label paper to be not smoothly fed out. SUMMARY

[0003] Embodiments of the present application provide a print head assembly and a printer, which can make the paper feeding more smooth during printing.

[0004] In a first aspect, embodiments of the present application provide a print head assembly, comprising: a base; a print head arranged on the base, the print head having a printing surface for the label paper to pass through; a paper guide assembly arranged on the base, the paper guide assembly comprising a paper guide piece, the paper guide piece and the print head are arranged in a first direction on the base, the paper guide piece has a paper guide surface for guiding the label paper to feed, the paper guide surface is higher than the printing surface in a direction perpendicular to the printing surface, and the paper guide piece can move in the first direction relative to the print head to change the interval between the paper guide piece and the print head when the label paper feeds.

[0005] In some embodiments of the present application, the paper guide assembly further comprises an elastic connecting piece, and the paper guide piece is slidably connected with the base in the first direction through the elastic connecting piece.

[0006] In some embodiments of the present application, the elastic connecting piece comprises an elastic arm, one end of the elastic arm is fixed with the base, the other end of the elastic arm is connected with the paper guide piece, and the elastic arm is used to drive the paper guide piece to move in the first direction relative to the base.

[0007] In some embodiments of the present application, the print head has a first center line, the first center line is parallel to the width direction of the print head, and the elastic arm is provided with at least two elastic arms, and the at least two elastic arms are symmetrically arranged about the first center line.

[0008] In some embodiments of this application, the elastic arm is disposed on the side of the base away from the print head, and a plurality of spaced spherical protrusions are provided on the side of the elastic arm facing the base, the spherical protrusions contacting the base.

[0009] In some embodiments of this application, the paper guide is provided with a plurality of spaced-apart guide ribs on the side facing the base, and the guide ribs are in contact with the base.

[0010] In some embodiments of this application, the guide rib extends along the first direction.

[0011] In some embodiments of this application, the paper guide assembly further includes a guide slide member connected to the paper guide member; the base is provided with a guide slide groove extending along the first direction, the guide slide member is located in the guide slide groove, the paper guide member can drive the guide slide member to move in the guide slide groove, and the guide slide groove is used to guide the guide slide member.

[0012] In some embodiments of this application, the guide slide is provided with a hook, and the guide slide groove is provided with a slot on the side wall of the groove. The hook is located in the slot, and the paper guide can drive the hook to move in the slot along the first direction. The hook is used to abut against the inner side wall of the slot to restrict the guide slide and the paper guide from moving away from the print head.

[0013] In some embodiments of this application, the inner peripheral sidewall of the card slot includes a first sidewall and a second sidewall arranged along the first direction; wherein, the paper guide has a first position and a second position on its moving trajectory. When the paper guide is located at the first position, the distance between the paper guide and the print head is the smallest, and the hook abuts against the first sidewall; when the paper guide is located at the second position, the distance between the paper guide and the print head is the largest, and the hook abuts against the second sidewall.

[0014] In some embodiments of this application, the paper guide assembly further includes a limiting member connected to the paper guide. When the paper guide moves to the minimum distance between itself and the print head, the limiting member abuts against the edge of the base to restrict the paper guide from moving closer to the print head.

[0015] In some embodiments of this application, the paper guide surface has a first side and a second side disposed opposite to each other, the first side being disposed close to the print head, and the paper guide surface being disposed inclined from the first side to the second side and in a direction away from the print head.

[0016] In some embodiments of this application, the printing surface and the paper guide surface are set at an angle α, where the angle α satisfies 3°≤α≤7°.

[0017] In some embodiments of this application, the distance between the paper guide and the print head along the first direction is d1, where d1 satisfies 0mm≤d1≤0.3mm.

[0018] In some embodiments of this application, when the paper guide moves to the maximum distance between itself and the print head, the distance between the paper guide and the print head is d2, where d2 satisfies 0mm ≤ d2 ≤ 0.6mm; and / or, The height difference between the paper guide surface and the printing surface in a direction perpendicular to the printing surface is d3, and d3 satisfies 0.05mm≤d3≤0.2mm.

[0019] Secondly, embodiments of this application also provide a printer, including a main body and a printhead assembly as described in any of the above embodiments, wherein the base is connected to the main body, the main body has a paper outlet, and the paper guide is located between the printhead and the paper outlet.

[0020] Based on the printhead assembly and printer in this application embodiment, this embodiment sets the paper guide as a movable structure, so that the paper guide can adaptively adjust the distance between the paper guide and the printhead according to the paper output or return direction of the label paper. This improves the smoothness of the paper feed during the paper feeding process and reduces the frictional resistance or paper feed deviation caused by the fixed paper guide. Therefore, the printhead assembly can not only avoid the problem of the label paper being scratched by the edge of the printhead during the paper return process, but also optimize the paper feed stability of the label paper during the output process, and improve the overall performance and reliability of the printhead assembly. Attached Figure Description

[0021] 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, 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.

[0022] Figure 1 This is a first-view structural diagram of the printhead assembly in one embodiment of this application; Figure 2 This is a schematic diagram of the structure when the paper guide is moved to its maximum distance from the print head in one embodiment of this application; Figure 3 This is a schematic diagram of the structure when the paper guide is moved to the minimum distance from the print head in one embodiment of this application; Figure 4 This is a second-view structural diagram of the printhead assembly in one embodiment of this application; Figure 5 This is a first-view structural diagram of the base and paper guide assembly separated in one embodiment of this application; Figure 6 This is a second-view structural diagram showing the separation of the base and the paper guide assembly in one embodiment of this application; Figure 7 for Figure 6 Enlarged structural diagram at point A; Figure 8 for Figure 6 Enlarged structural diagram at point B; Figure 9 This is a third-view structural diagram of the printhead assembly in one embodiment of this application; Figure 10 for Figure 9 Enlarged structural diagram at point C; Figure 11 This is a schematic diagram of the printer structure in one embodiment of this application.

[0023] Figure label: 100. Printhead assembly; 10. Base; 11. Guide groove; 12. Slot; 121. First side wall; 122. Second side wall; 20. Print head; 21. Printing surface; 22. Heating wire; 30. Paper guide assembly; 31. Paper guide component; 311. Paper guide surface; 312. Guide rib; 32. Elastic arm; 321. Spherical protrusion; 33. Guide component; 34. Hook; 35. Limiting component; 200. Printer; 40. Main body; 41. Upper shell; 42. Lower shell; L1, First Direction. Detailed Implementation

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] In related technologies, printers include a printhead and a paper guide strip for guiding paper output. The paper guide strip is located at the paper output end of the printhead. Since the edge of the paper output end of the printhead is relatively sharp, it is easy to scratch the label paper when it is being fed back into the printer. Therefore, the height of the paper guide strip is generally higher than the edge of the printhead. However, this setting can easily cause the label paper to feed unevenly when it is being output.

[0026] Regarding the above situation, firstly, please refer to [link / reference needed]. Figures 1-3 This application proposes a printhead assembly 100, including a base 10, a printhead 20, and a paper guide assembly 30.

[0027] A printhead 20 is disposed on a base 10 and has a printing surface 21 for passing label paper. A paper guide assembly 30 is disposed on the base 10 and includes a paper guide 31. The paper guide 31 and the printhead 20 are spaced apart on the base 10 along a first direction L1. The paper guide 31 has a paper guide surface 311 for guiding the label paper. The paper guide surface 311 is higher than the printing surface 21 in a direction perpendicular to the printing surface 21. The paper guide 31 can move with the label paper relative to the printhead 20 along the first direction L1 when the label paper is fed, so as to change the interval between the paper guide 31 and the printhead 20.

[0028] The printing surface 21 is equipped with heating wires 22 for heating and printing the label paper. When the label paper exits the printhead assembly 100 along the first direction L1, it first passes the printing surface 21 and then the paper guide surface 311. When the label paper returns to the printhead assembly 100 along the first direction L1, it first passes the paper guide surface 311 and then returns to the printing surface 21. The design of the paper guide surface 311 being higher than the printing surface 21 allows the label paper to smoothly transition to the paper guide assembly 30 when passing the printhead 20, thus avoiding direct contact between the label paper and the sharp edge of the printhead 20 during movement and preventing the label paper from being scratched. At the same time, the paper guide 31 can move with the label paper, thereby adaptively adjusting the distance between the paper guide 31 and the printhead 20, allowing the label paper to pass smoothly during both output and return processes, effectively improving the problem of uneven paper feeding.

[0029] Specifically, when the print head assembly 100 prints label paper, the printing surface 21 can cooperate with the rubber roller. The rubber roller presses the label paper and drives the label paper to move towards the paper guide 31. When the label paper contacts the paper guide surface 311, friction is generated between the label paper and the paper guide surface 311. This friction can drive the paper guide 31 to move along the first direction L1. Figure 2 The diagram shows the maximum distance between the paper guide 31 and the print head 20. Figure 3The diagram shows the minimum distance between the paper guide 31 and the print head 20. When the label paper is ejected along the first direction L1, the paper guide 31 can move away from the print head 20 along the first direction L1, thereby increasing the gap between the paper guide 31 and the print head 20. This makes the bending angle of the label paper from the printing surface 21 to the paper guide surface 311 more gradual, thereby reducing the resistance of the label paper during the ejection process and improving the smoothness of the ejection. When the label paper is returned along the first direction L1, the paper guide 31 can move closer to the print head 20 along the first direction L1, thereby reducing the gap between the paper guide 31 and the print head 20. Since the paper guide surface 311 is higher than the printing surface 21, it can prevent the label paper from directly contacting the sharp edge of the print head 20 during the return process, thereby preventing the label paper from being scratched.

[0030] It should be noted that, in this embodiment, by setting the paper guide 31 as a movable structure, the paper guide 31 can adaptively adjust the distance between the paper guide 31 and the print head 20 according to the paper output or return direction. This improves the smoothness of paper feeding during the paper feeding process and reduces frictional resistance or paper feeding deviation caused by the fixed paper guide 31. Therefore, the print head assembly 100 can not only avoid the problem of the label paper being scratched by the edge of the print head 20 during the paper return process, but also optimize the paper feeding stability during the output process, improving the overall performance and reliability of the print head assembly 100. In addition, this movable paper guide 31 design also optimizes the adaptability of the height difference between the paper guide surface 311 and the printing surface 21, enabling good guiding effect for label paper of different thicknesses or materials, and improving the applicability and stability of the print head assembly 100.

[0031] Please see Figures 2-3 In some embodiments of this application, the paper guide surface 311 has a first side and a second side that are disposed opposite to each other. The first side is disposed close to the print head 20, and the paper guide surface 311 is disposed inclined from the first side to the second side and in a direction away from the print head 20.

[0032] Specifically, the guide surface 311 gradually rises from the first side to the second side, so that the label paper can maintain a natural gradual upward trend when passing through the guide surface 311, thereby reducing the paper feeding resistance caused by abrupt height differences, and ensuring that the label paper has good adhesion and guidance when moving on the guide surface 311.

[0033] Furthermore, the tilt angle of the guide surface 311 can be optimized according to actual paper feeding requirements to ensure that the label paper can smoothly transition under different running speeds and thicknesses, avoiding paper jams or deviations caused by improper tilt angles. In some embodiments, the printing surface 21 and the guide surface 311 are set at an angle α, where the angle α satisfies 3°≤α≤7°. If the angle α is too small, the label paper may not be able to effectively buffer the height difference when passing through the guide surface 311, thereby increasing paper feeding resistance and affecting the smoothness of paper output. In addition, the part of the guide surface 311 near the second side is prone to poor guiding effect of the label paper on the guide surface 311 due to the small height difference. If the angle α is too large, the label paper may bend and deform when passing through the guide surface 311 due to the steep tilt angle, affecting the stability of paper feeding and even causing paper jams. Therefore, by controlling the included angle α within the range of 3° to 7°, it is possible to ensure the smooth passage of the label paper while effectively improving the guiding accuracy and adhesion performance of the paper guide surface 311, and optimizing the overall paper feeding performance and reliability of the printhead assembly 100.

[0034] In some embodiments of this application, such as Figure 1 As shown, the distance between the paper guide 31 and the print head 20 along the first direction L1 is d1, and d1 satisfies 0mm≤d1≤0.3mm.

[0035] Understandably, when the paper guide 31 is not moving relative to the print head 20, there is a distance d1 between the paper guide 31 and the print head 20. This distance d1 can be 0mm, meaning a zero-gap setting can be achieved between the paper guide 31 and the print head 20. This ensures a smoother transition of the label paper when entering the printing area. Furthermore, the paper guide 31 can move away from the print head 20 under the influence of the label paper, automatically adjusting the gap with the print head 20. If the distance d1 is too large, when the paper guide 31 moves closer to the print head 20, the travel distance may be too long, requiring a large force to reach its limit position near the print head 20. This could result in insufficient force for the paper guide 31 to follow the label paper.

[0036] In some embodiments of this application, such as Figure 2As shown, when the paper guide 31 moves to the maximum distance between itself and the print head 20, the distance between the paper guide 31 and the print head 20 is d2, which satisfies 0mm≤d2≤0.6mm. If the distance d2 is too small, the maximum distance d2 between the paper guide 31 and the print head 20 will be insufficient, which may result in a larger bending angle of the label paper when it transitions from the printing surface 21 to the paper guide surface 311, thereby increasing the bending stress of the label paper and making the label paper feeding unsmooth. If the distance d2 is too large, the maximum distance d2 between the paper guide 31 and the print head 20 will be large, which may cause some narrower label papers to get stuck in the gap between the paper guide 31 and the print head 20, resulting in unstable paper feeding or paper jams.

[0037] In some embodiments of this application, such as Figure 3 As shown, the height difference between the paper guide surface 311 and the printing surface 21 in the direction perpendicular to the printing surface 21 is d3. d3 satisfies 0.05mm≤d3≤0.2mm. If the height difference d3 is too large, the label paper will have a large bending angle between the paper guide surface 311 and the printing surface 21. In addition, the paper guide surface 311 is also prone to pushing up the rubber roller on the printing surface 21, making it impossible for the label paper to fully contact the heating line 22 on the printing surface 21, thereby affecting the stability of paper feeding and even causing problems such as blurry or discontinuous printing content. If the height difference d3 is too small, the transition between the paper guide surface 311 and the printing surface 21 is not significant enough, and the label paper is easily scratched by the sharp edge of the print head 20 when the paper is returned.

[0038] In some embodiments of this application, the paper guide assembly 30 further includes an elastic connector. The paper guide 31 is slidably connected to the base 10 along the first direction L1 via the elastic connector. That is, the elastic connector can provide appropriate elasticity to the paper guide 31, so that the paper guide 31 can move flexibly in the direction close to or away from the print head 20 under the action of the label paper, and automatically reset after the paper guide 31 is removed from the force of the label paper, thereby ensuring that the gap between the paper guide 31 and the print head 20 is always within a suitable range.

[0039] The elastic force of the elastic connector should not be too large or too small. If the elastic force is too large, the force required for the paper guide 31 to move will increase, which may affect the response speed of the paper guide 31 to changes in the label paper. If the elastic force is too small, the paper guide 31 will not be able to reset effectively, resulting in unstable gap control. The elastic connector is preferably a spring or spring sheet structure, which is simple in structure, highly reliable, and easy to assemble and maintain.

[0040] Further, please see Figures 3-4In some embodiments of this application, the elastic connector includes an elastic arm 32. One end of the elastic arm 32 is fixed to the base 10, and the other end of the elastic arm 32 is connected to the paper guide 31. The elastic arm 32 is used to drive the paper guide 31 to move relative to the base 10 along the first direction L1, so that the distance between the paper guide 31 and the print head 20 can be adjusted according to the paper feeding or returning direction of the label paper.

[0041] Specifically, the elastic arm 32 has good elasticity and restoring force, enabling it to deform when the paper guide 31 is subjected to external force and quickly return to its original shape after the force disappears, thereby driving the paper guide 31 to stably reset. When the label paper is output, the paper guide moves away from the print head 20 under the action of the label paper, at which time the elastic arm 32 is in a stretched state; when the label paper is returned, the paper guide moves towards the print head 20 under the action of the label paper, at which time the elastic arm 32 returns to its original shape from the stretched state.

[0042] The elastic arm 32 can be positioned on the back of the base 10, the side of the substrate, or other locations; alternatively, the elastic arm 32 can be positioned on both sides of the paper guide 31. The specific position of the elastic arm 32 can be adjusted according to the internal spatial layout of the printhead assembly 100 to ensure that the paper guide 31 is subjected to uniform force and operates stably and reliably during movement.

[0043] Furthermore, please see Figure 4 In some embodiments of this application, the print head 20 has a first center line, which is parallel to the width direction of the print head 20; at least two elastic arms 32 are provided, and the at least two elastic arms 32 are symmetrically arranged about the first center line, thereby ensuring that the force on the elastic arms 32 is evenly distributed, so that the paper guide 31 remains balanced during movement and avoids tilting or jamming of the paper guide 31 due to uneven force.

[0044] In some embodiments of this application, such as Figures 4-5 As shown, the elastic arm 32 is located on the side of the base 10 away from the print head 20. Multiple spaced spherical protrusions 321 are arranged on the side of the elastic arm 32 facing the base 10, and these protrusions 321 contact the base 10. It can be understood that the side of the spherical protrusions 321 facing the base 10 is a spherical surface, which can form point contact or partial contact with the surface of the base 10, thereby reducing the friction between the spherical protrusions 321 and the base 10. This makes the elastic arm 32 more flexible and responsive during deformation and reset under stress.

[0045] Please see Figure 6 In some embodiments of this application, the paper guide 31 is provided with a plurality of spaced guide ribs 312 on the side facing the base 10, and the guide ribs 312 are in contact with the base 10.

[0046] Understandably, the guide ribs 312 effectively reduce the contact area between the paper guide 31 and the base 10, thereby reducing the frictional resistance between them and allowing the paper guide 31 to move more smoothly along the first direction L1 under the drive of the elastic arm 32. In addition, since the paper guide surface 311 is pressed by the label paper or the rubber roller, the contact pressure between the paper guide 31 and the base 10 is relatively large. Compared with the spherical protrusions 321, the contact area between the guide ribs 312 and the base 10 is larger. The guide ribs 312 can provide a certain support force for the paper guide 31 while ensuring stable sliding of the paper guide 31, preventing the paper guide 31 from tilting or shaking during movement.

[0047] Furthermore, such as Figure 6 As shown, the guide rib 312 extends along the first direction L1. That is to say, the extension direction of the guide rib 312 is consistent with the movement direction of the paper guide 31, so that the paper guide 31 can move more smoothly and steadily along the first direction L1, and at the same time reduce the resistance and deviation of the paper guide 31 during the movement.

[0048] Please see Figures 6-8 In some embodiments of this application, the paper guide assembly 30 further includes a guide slide 33, which is connected to the paper guide 31; the base 10 is provided with a guide groove 11 extending along the first direction L1, the guide slide 33 is located in the guide groove 11, the paper guide 31 can drive the guide slide 33 to move in the guide groove 11, and the guide groove 11 is used to guide the guide slide 33.

[0049] Specifically, the cooperation between the guide slide 33 and the guide groove 11 improves the guiding accuracy and stability of the paper guide 31 during movement, preventing the paper guide 31 from shifting or wobbling in directions other than the first direction L1 due to external interference, thereby ensuring the accuracy and continuity of label paper feeding during printing. A gap exists between the inner wall of the guide groove 11 and the outer surface of the guide slide 33. This gap ensures smooth and secure sliding of the guide slide 33 within the guide groove 11, while also preventing interference caused by assembly errors or thermal expansion.

[0050] In some embodiments, such as Figure 8As shown, the guide slide 33 can be set on the elastic arm 32, and the guide slide 33 and the elastic arm 32 are integrally formed, thereby simplifying the assembly process and improving the overall structural strength. When the elastic arm 32 is deformed under force, the guide slide 33 can slide synchronously along the guide groove 11 with the elastic arm 32, further ensuring the stability and guiding accuracy of the paper guide 31 during the movement. The number of guide slides 33 corresponds to the number of elastic arms 32. Each elastic arm 32 is provided with one guide slide 33, and multiple guide slides 33 are respectively embedded in multiple guide grooves 11, so that the force points of the paper guide 31 are balanced during the movement, and the movement is more stable.

[0051] Furthermore, such as Figure 8 , Figure 9 and Figure 10 As shown, in some embodiments of this application, the guide slide 33 is provided with a hook 34, and the guide slide groove 11 has a groove 12 on its side wall. The hook 34 is located in the groove 12. The paper guide 31 can drive the hook 34 to move in the groove 12 along the first direction L1. The hook 34 is used to abut against the inner side wall of the groove 12 to limit the movement of the guide slide 33 and the paper guide 31 away from the print head 20. That is, the cooperation between the hook 34 and the groove 12 can limit the maximum displacement distance of the paper guide 31 and prevent the paper guide 31 from leaving the normal working range due to excessive displacement.

[0052] The hook 34 has at least one contact surface. When the paper guide 31 moves to its limit position away from the print head 20, the contact surface fits tightly against the inner wall of the slot 12, thereby restricting the paper guide 31 from moving further away from the print head 20 and ensuring that the paper guide 31 is always within the printing working area.

[0053] Furthermore, in some embodiments of this application, such as Figure 4 and Figure 6 As shown, the paper guide assembly 30 also includes a limiting member 35, which is connected to the paper guide 31. When the paper guide 31 moves to the minimum distance between itself and the print head 20, the limiting member 35 abuts against the edge of the base 10 to limit the paper guide 31 from continuing to move closer to the print head 20, thereby preventing the paper guide 31 from getting too close to the print head 20 and causing the paper guide 31 to push up the rubber roller.

[0054] Alternatively, in some embodiments of this application, such as Figures 7-8As shown, the inner peripheral sidewall of the card slot 12 includes a first sidewall 121 and a second sidewall 122 arranged along the first direction L1; the hook 34 has two back-to-back abutment surfaces, and the paper guide 31 has a first position and a second position on its movement trajectory. When the paper guide 31 is in the first position, the distance between the paper guide 31 and the print head 20 is the smallest, and one abutment surface on the hook 34 abuts against the first sidewall 121, thereby preventing the paper guide 31 from continuing to move closer to the print head 20; when the paper guide 31 is in the second position, the distance between the paper guide 31 and the print head 20 is the largest, and the other abutment surface on the hook 34 abuts against the second sidewall 122, thereby preventing the paper guide 31 from continuing to move away from the print head 20.

[0055] It is understandable that, such as Figure 10 As shown, the two abutting surfaces of the hook 34 cooperate with the first side wall 121 and the second side wall 122 respectively to achieve bidirectional limiting of the paper guide 31 in the first direction L1, ensuring that the paper guide 31 moves accurately within the set range, preventing the paper guide 31 from colliding with the print head 20, and avoiding the paper guide 31 from leaving the printing area due to excessive displacement, thereby further improving the stability and reliability of the printing process.

[0056] Secondly, such as Figure 11 As shown, this application embodiment also provides a printer 200, which is used to print characters on label paper. The printer 200 includes a main body 40 and a printhead assembly 100 as described in any of the above embodiments. The base 10 is connected to the main body 40. The main body 40 has a paper outlet. The paper guide 31 is located between the printhead 20 and the paper outlet. The label paper passes sequentially through the printing surface 21 of the printhead 20 and the paper guide surface 311 of the paper guide 31, and is output through the paper outlet.

[0057] The main body 40 includes an upper shell 41 and a lower shell 42. The upper shell 41 and the lower shell 42 are connected and enclosed to form a receiving cavity. The receiving cavity is connected to the paper output port. The print head 20 is installed in the receiving cavity, and the paper guide 31 is set towards the paper output port.

[0058] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A printhead assembly, characterized in that, include: Base; A printhead, disposed on the base, the printhead having a printing surface for passing label paper; A paper guide assembly is disposed on the base. The paper guide assembly includes a paper guide member, which is spaced apart from the print head on the base along a first direction. The paper guide member has a paper guide surface for guiding the label paper feed. The paper guide surface is higher than the print surface in a direction perpendicular to the print surface. The paper guide member can follow the label paper and move relative to the print head along the first direction when the label paper feeds, so as to change the interval between the paper guide member and the print head.

2. The printhead assembly according to claim 1, characterized in that, The paper guide assembly further includes an elastic connector, and the paper guide is slidably connected to the base along the first direction via the elastic connector.

3. The printhead assembly according to claim 2, characterized in that, The elastic connector includes an elastic arm, one end of which is fixed to the base, and the other end of which is connected to the paper guide. The elastic arm is used to drive the paper guide to move relative to the base along the first direction.

4. The printhead assembly according to claim 3, characterized in that, The print head has a first center line, which is parallel to the width direction of the print head; The elastic arm is provided in at least two parts, and the at least two elastic arms are symmetrically arranged about the first centerline.

5. The printhead assembly according to claim 3, characterized in that, The elastic arm is located on the side of the base away from the print head. The side of the elastic arm facing the base has a plurality of spaced spherical protrusions that contact the base.

6. The printhead assembly according to claim 1, characterized in that, The paper guide has a plurality of spaced guide ribs on the side facing the base, and the guide ribs are in contact with the base.

7. The printhead assembly according to claim 6, characterized in that, The guide ribs extend along the first direction.

8. The printhead assembly according to claim 1, characterized in that, The paper guiding assembly further includes a guide slide, which is connected to the paper guiding assembly; The base is provided with a guide groove extending along the first direction, the guide member is located in the guide groove, the paper guide member can drive the guide member to move in the guide groove, and the guide groove is used to guide the guide member.

9. The printhead assembly according to claim 8, characterized in that, The guide slide is provided with a hook, and the guide slide groove has a slot on its side wall. The hook is located in the slot. The paper guide can drive the hook to move in the slot along the first direction. The hook is used to abut against the inner side wall of the slot to restrict the guide slide and the paper guide from moving away from the print head.

10. The printhead assembly according to claim 9, characterized in that, The inner peripheral sidewall of the slot includes a first sidewall and a second sidewall arranged along the first direction; The paper guide has a first position and a second position on its movement trajectory. When the paper guide is in the first position, the distance between the paper guide and the print head is the smallest, and the hook abuts against the first side wall. When the paper guide is in the second position, the distance between the paper guide and the print head is the largest, and the hook abuts against the second side wall.

11. The printhead assembly according to claim 9, characterized in that, The paper guide assembly also includes a limiting member connected to the paper guide. When the paper guide moves to the minimum distance between itself and the print head, the limiting member abuts against the edge of the base to restrict the paper guide from moving closer to the print head.

12. The printhead assembly according to claim 1, characterized in that, The paper guide surface has a first side and a second side that are arranged opposite to each other. The first side is located close to the print head, and the paper guide surface is inclined from the first side to the second side and away from the print head.

13. The printhead assembly according to claim 12, characterized in that, The printing surface and the paper guide surface are set at an angle α, where the angle α satisfies 3°≤α≤7°.

14. The printhead assembly according to claim 1, characterized in that, The distance between the paper guide and the print head along the first direction is d1, where d1 satisfies 0mm≤d1≤0.3mm.

15. The printhead assembly according to claim 1, characterized in that, When the paper guide moves to its maximum distance from the print head, the distance between the paper guide and the print head is d2, where d2 satisfies 0mm ≤ d2 ≤ 0.6mm; and / or, The height difference between the paper guide surface and the printing surface in a direction perpendicular to the printing surface is d3, and d3 satisfies 0.05mm≤d3≤0.2mm.

16. A printer, characterized in that, The device includes a main body and a printhead assembly as described in claims 1 to 15, the base being connected to the main body, the main body having a paper outlet, and the paper guide being located between the printhead and the paper outlet.

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