Printer

Abstract

This invention provides a printer, comprising a base, a cover, and a drive roller. The cover is movably disposed on the base. A first guide protrusion is provided at one end of the base facing the cover. The drive roller is rotatably disposed at one end of the base near the cover. A second guide protrusion is provided at one end of the cover near the base. In the paper feeding direction of the printer, the second guide protrusion and the first guide protrusion are staggered, and both the second and first guide protrusions are located upstream of the drive roller. When the cover is closed on the base, a paper feeding channel is formed between the base and the cover. The paper feeding channel has a paper inlet and a paper outlet, located at both ends of the cover. The first and second guide protrusions are located on both sides of the paper feeding channel. In the direction perpendicular to the paper feeding channel, the free end of the second guide protrusion is lower than the free end of the first guide protrusion. This improves the user experience.

Description

Technical Field

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

[0002] A thermal printer is a device that prints onto thermal paper. A thermal printer has a printhead and a drive roller. When a thermal printer performs a printing task, the thermal sheet of the printhead and the drive roller press against the thermal paper to print the desired content.

[0003] In related technologies, when a printer is printing, the paper is prone to wrinkles, which can cause text and images to become distorted, thus affecting the user experience and reducing the user's usability. Utility Model Content

[0004] In view of this, this application provides a printer that can improve the user experience.

[0005] This application provides a printer, comprising: a base, a cover, and a drive roller; the cover is movably disposed on the base; a first guide protrusion is provided at one end of the base facing the cover, the first guide protrusion protruding towards the cover; the drive roller is rotatably disposed at one end of the base near the cover; a second guide protrusion is provided at one end of the cover near the base, the second guide protrusion protruding towards the base; in the paper feeding direction of the printer, the second guide protrusion and the first guide protrusion are staggered, and both the second guide protrusion and the first guide protrusion are located upstream of the drive roller; wherein, when the cover is closed on the base, a paper feeding channel is formed between the base and the cover, the paper feeding channel having a paper inlet and a paper outlet, the paper inlet and the paper outlet being located at both ends of the cover, the first guide protrusion and the second guide protrusion being located on both sides of the paper feeding channel, and in a direction perpendicular to the paper feeding channel, the free end of the second guide protrusion is lower than the free end of the first guide protrusion.

[0006] According to the embodiments of this application, the printer drives the paper from a stationary state to a moving state via a drive roller, causing the paper to move within the paper feed channel. A first guide protrusion within the paper feed channel can press against the surface of the paper facing the base, and a second guide protrusion can press against the surface of the paper facing the cover. Furthermore, due to the height difference between the free ends of the first and second guide protrusions, the paper passing through the first and second guide protrusions can be stretched, thereby smoothing out the wrinkles in the paper before it enters the drive roller, improving the printing effect, and thus enhancing the user experience.

[0007] In one possible implementation of this application, the surface of the first guide protrusion includes a first extension and a second extension connected together. In the direction from the paper inlet to the paper outlet, the first extension is inclined toward the cover, and the second extension is inclined away from the end of the first extension near the paper outlet.

[0008] In one possible implementation of this application, both the first extension segment and the second extension segment are bent into an arc shape.

[0009] In one possible implementation of this application, the center lines of the first extension segment and the second extension segment are parallel or collinear.

[0010] In one possible implementation of this application, a portion of the side wall panel of the base adjacent to the cover protrudes toward the cover to form the first guide protrusion, and defines a clearance groove on the side opposite to the cover; the printer includes a motor, a portion of which is located within the clearance groove.

[0011] In one possible implementation of this application, the surface of the base facing the cover has a first guide plane that extends from the first extension to the paper inlet.

[0012] In one possible implementation of this application, the surface of the second guide protrusion includes a first connecting segment, a second connecting segment, and a third connecting segment connected sequentially in the paper feeding direction. The second connecting segment is used to abut against the paper in the paper feeding channel. In the direction from the base to the cover, the first connecting segment and the third connecting segment are inclined in a direction away from each other.

[0013] In one possible implementation of this application, a guide groove is provided at one end of the cover near the base, the guide groove is recessed in a direction away from the base, and the guide groove is directly opposite the first guide protrusion.

[0014] In one possible implementation of this application, the surface of the base facing the cover has a second guide surface, the third connecting segment is connected to the guide groove through the second guide surface, both the second guide surface and the guide groove are directly opposite the first guide protrusion, and the distance between the second guide surface and the first guide protrusion is greater than the distance between the bottom wall of the guide groove and the first guide protrusion.

[0015] In one possible implementation of this application, the end of the cover facing the base has a relief groove, the relief groove is disposed on the side of the first connecting section near the paper inlet, and the relief groove is recessed in a direction away from the base. Attached Figure Description

[0016] Figure 1 A perspective view of a printer provided for some embodiments of this application.

[0017] Figure 2 A cross-sectional view of a printer provided for some embodiments of this application.

[0018] Figure label: 100. Printer; 1. Base; 11. Drive roller; 12. Motor; 13. Clearance groove; 2. Cover; 21. Print head; 3. Paper path; 31. Paper inlet; 32. Paper outlet; 4. First guide protrusion; 41. First extension section; 42. Second extension section; 43. First guide plane; 5. Second guide protrusion; 51. First connecting section; 52. Second connecting section; 53. Third connecting section; 54. Guide groove; 541. Groove bottom wall; 55. Second guide surface; 56. Clearance groove. Detailed Implementation

[0019] The technical solutions in 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, and not all embodiments.

[0020] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0021] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] In the description of this application, it should be understood that 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. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.

[0023] In the description of this application, the terms “length”, “width”, “thickness”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0024] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also 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.

[0025] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0026] A thermal printer is a device that prints onto thermal paper. A thermal printer has a printhead and a drive roller. When a thermal printer performs a printing task, the thermal sheet of the printhead and the drive roller press against the thermal paper to print the desired content.

[0027] In related technologies, when a printer is printing, the paper is prone to wrinkles, which can cause text and images to become distorted, thus affecting the user experience and reducing the user's usability.

[0028] To address the aforementioned technical problems, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Please see Figure 1 and Figure 2 , Figure 1 A perspective view of a printer provided in some embodiments of this application. Figure 2 This is a cross-sectional view of a printer provided in some embodiments of this application. A printer 100 according to an embodiment of this application may include a base 1, a cover 2, and a drive roller 11.

[0030] The cover 2 is movably disposed on the base 1. For example, the cover 2 is rotatable relative to the base 1. Thus, when the printer 100 needs to be used, the cover 2 can be rotated relative to the base 1 by a preset angle so that the surface of the base 1 facing the cover 2 can be exposed, then paper can be placed on the base 1, and then the cover 2 can be rotated so that the cover 2 can close on the base 1.

[0031] The drive roller 11 is rotatably disposed at one end of the base 1 near the cover 2. The drive roller 11 is used to cooperate with the print head 21 disposed on the cover 2 to print the required content on the paper.

[0032] A first guide protrusion 4 is provided at one end of the base 1 facing the cover 2. The first guide protrusion 4 can protrude towards the cover 2. Thus, in the direction from the base 1 to the cover 2, the first guide protrusion 4 can extend from the surface of the base 1 facing the cover 2 towards the cover 2, and can have a gap between it and the surface of the cover 2. Thus, when the paper passes through the first guide protrusion 4, it can press against the surface of the paper facing the base 1.

[0033] A second guide protrusion 5 is provided at one end of the cover 2 near the base 1. The second guide protrusion 5 protrudes towards the base 1. Specifically, in the direction from the cover 2 to the base 1, the second guide protrusion 5 can extend from the surface of the cover 2 near the base 1 towards the base 1, and can have a gap between it and the surface of the base 1. Thus, when the paper passes through the second guide protrusion 5, it can press against the surface of the paper facing the cover 2.

[0034] In the direction perpendicular to the paper feed path, the free end of the second guide protrusion 5 is lower than the free end of the first guide protrusion 4. Specifically, the free end of the second guide protrusion 5 is located on the side of the free end of the first guide protrusion 4 closer to the interior of the base 1, thus creating a height difference between the ends of the second guide protrusion 5 and the first guide protrusion 4. The portion of the paper located between the first guide protrusion 4 and the second guide protrusion 5 can be stretched.

[0035] For example, the distance between the end of the second guide protrusion 5 and the end of the first guide protrusion 4 can be greater than 2 mm. Here, the distance between the end of the second guide protrusion 5 and the end of the first guide protrusion 4 refers to the distance between the plane where the end of the second guide protrusion 5 is located and the plane where the end of the first guide protrusion 4 is located.

[0036] In the paper feed direction of the printer, the second guide protrusion 5 and the first guide protrusion 4 are staggered, and both the second guide protrusion 5 and the first guide protrusion 4 are located upstream of the drive roller 11. The second guide protrusion 5 can be located on the side of the first guide protrusion 4 closer to the drive roller 11, or it can be located on the side of the first guide protrusion 4 farther from the drive roller 11. Figure 2 In the embodiment shown, the second guide protrusion 5 is located on the side of the first guide protrusion 4 away from the drive roller 11.

[0037] Therefore, the paper can be smoothed out by the first guide protrusion 4 and the second guide protrusion 5 before entering the drive roller 11, which helps to ensure the printing effect of the printer 100.

[0038] When the cover 2 is closed on the base 1, a paper feeding channel 3 is formed between the base 1 and the cover 2. The first guide protrusion 4 and the second guide protrusion 5 are located on both sides of the paper feeding channel 3. The paper feeding channel 3 has a paper inlet 31 and a paper outlet 32, so that paper can enter the paper feeding channel 3 from the paper inlet 31 and leave the paper feeding channel 3 from the paper outlet 32.

[0039] When using printer 100, first rotate cover 2 relative to base 1 by a preset angle. Then, place paper on base 1 and allow drive roller 11 to move the paper. Next, close cover 2 onto base 1, positioning part of the paper within paper path 3, allowing it to contact the first guide protrusion 4 and the second guide protrusion 5. Then, control drive roller 11 to rotate, allowing the paper to move. During paper movement, the second guide protrusion 5 abuts against the surface of the paper facing cover 2, smoothing out wrinkles on the paper's surface facing cover 2. Due to the height difference between the first guide protrusion 4 and the second guide protrusion 5, the portion of paper between the first guide protrusion 4 and the second guide protrusion 5 can be stretched, thus smoothing out wrinkles generated during paper movement. After being smoothed by the second guide protrusion 5 and the first guide protrusion 4, the portion of paper smoothed by the second guide protrusion 5 and the first guide protrusion 4 is then passed through drive roller 11 and printhead 21 to print the desired content. Finally, the paper is output from the output port 32 to the printer 100.

[0040] The paper inlet 31 and the paper outlet 32 ​​can be located at opposite ends of the cover 2. This avoids the need for a paper tray inside the printer 100, thereby reducing the size of the printer 100 and making it more portable.

[0041] For example, in the arrangement direction of the base 1 and the cover 2, the opposite sides of the paper inlet 31 and the paper outlet 32 ​​can be guide slopes, so that the size of the paper inlet 31 and the paper outlet 32 ​​can be larger than the size of the paper path 3, thereby facilitating the input and output of paper.

[0042] According to the embodiment of this application, the printer 100 drives the paper from a stationary state to a moving state through the drive roller 11, so that the paper moves in the paper feeding channel 3. The first guide protrusion 4 in the paper feeding channel 3 can press against the surface of the paper facing the base 1, and the second guide protrusion 5 can press against the surface of the paper facing the cover 2. Since there is a height difference between the free end of the first guide protrusion 4 and the free end of the second guide protrusion 5, the paper passing through the first guide protrusion 4 and the second guide protrusion 5 can be stretched, so that the wrinkles of the paper can be smoothed before the paper enters the drive roller 11, improving the printing effect and thus improving the user experience.

[0043] Please continue reading. Figure 1 and Figure 2In some embodiments, the surface of the first guide protrusion 4 may include a connected first extension 41 and a second extension 42. In the direction from the paper inlet 31 to the paper outlet 32, the first extension 41 is inclined towards the cover 2. Therefore, the first extension 41 can also increase the contact area between the first guide protrusion 4 and the paper, thereby improving the ability of the first guide protrusion 4 to smooth out wrinkles. Furthermore, when the second guide protrusion 5 is located on the side of the first guide protrusion 4 away from the drive roller 11, the paper, after passing the second guide protrusion 5, can move along the first extension 41 towards the free end of the first guide protrusion 4, thus allowing the paper passing through the second guide protrusion 5 to better transition to the free end of the first guide protrusion 4, thereby improving the printing speed of the printer 100.

[0044] The second extension 42 is inclined away from the end of the first extension 41 near the paper outlet 32 ​​and away from the cover 2. As a result, the paper passing through the free end of the first guide protrusion 4 can move along the second extension 42 toward the drive roller 11, so that the paper passing through the second extension 42 can enter the drive roller 11 more smoothly, thereby improving the printer 100's ability to smooth out wrinkles.

[0045] For example, in the arrangement direction of the base 1 and the cover 2, the end of the second extension 42 away from the first extension 41 can be located away from the contact point between the drive roller 11 and the print head 21. Then, the paper output from the second extension 42 can be stretched after entering the drive roller 11 and the print head 21, which helps to further improve the printer 100's ability to smooth out wrinkles.

[0046] Please continue reading. Figure 1 and Figure 2 In some embodiments, both the first extension 41 and the second extension 42 are bent into an arc shape. This helps to increase the contact area between the first extension 41 and the second extension 42 and the paper, thereby improving the printer 100's ability to smooth out wrinkles. At the same time, the arc-shaped first extension 41 and the second extension 42 can achieve a longer paper path in a smaller space, thus contributing to the miniaturization of the printer 100.

[0047] Please continue reading. Figure 1 and Figure 2 In some embodiments, the center lines of the first extension 41 and the second extension 42 are parallel or collinear. This arrangement helps to improve the printer 100's ability to smooth out wrinkles.

[0048] "Collinear" means approximately collinearity within a certain margin of error, which can be a deviation of 5°, 10°, or 15° relative to absolute collinearity. "Parallel" includes absolute parallelism and approximately parallelism, where the acceptable deviation range for approximately parallelism can be, for example, a deviation of 5°, 8°, or 10°.

[0049] Please continue reading. Figure 1 and Figure 2 In some embodiments, a side panel of the base 1 adjacent to the cover 2 may protrude towards the cover 2 to form a first guide protrusion 4, and define a clearance groove 13 on the side opposite to the cover 2. Specifically, in the arrangement direction of the base 1 and the cover 2, a portion of the side panel of the base 1 adjacent to the cover 2 may define the first guide protrusion 4 on the side facing the cover 2, and define a clearance groove 13 on the other side. The printer 100 may include a motor 12, a portion of which is located within the clearance groove 13. Thus, a portion of the motor 12 can be accommodated by the clearance groove 13 defined by the first guide protrusion 4, thereby facilitating the optimization of the structural layout of the printer 100 and enabling the printer 100 to be miniaturized.

[0050] For example, the first extension 41 and the second extension 42 can also be flat, which helps to reduce the risk of paper jams in the printer.

[0051] Please continue reading. Figure 1 and Figure 2 In some embodiments, the surface of the base 1 facing the cover 2 has a first guide plane 43. The first guide plane 43 extends from the first extension 41 to the paper inlet 31. Therefore, by providing the first guide plane 43, paper can easily enter the paper path 3 from the paper inlet 31, thereby reducing paper feeding resistance and improving the reliability of the printer 100. It also facilitates the placement of components that limit paper size on the first guide plane 43.

[0052] Specifically, when the second guide protrusion 5 is located on the side of the first guide protrusion 4 away from the drive roller 11, at least a portion of the second guide protrusion 5 can be directly opposite the first guide plane 43. Then, when the printer 100 is used, paper can enter the paper path 3 from the paper inlet 31 and move along the extending direction of the first guide plane 43. When the paper moves between the second guide protrusion 5 and the first guide plane 43, it is pressed against the paper by the second guide protrusion 5.

[0053] Please continue reading. Figure 1 and Figure 2In some embodiments, the surface of the second guide protrusion 5 may include a first connecting segment 51, a second connecting segment 52, and a third connecting segment 53 connected in sequence. The second connecting segment 52 is used to abut against the paper in the paper feed channel 3. In the direction from the base 1 to the cover 2, the first connecting segment 51 and the third connecting segment 53 are inclined in a direction away from each other. The connection points of the first connecting segment 51 and the second connecting segment 52, and the connection points of the second connecting segment 52 and the third connecting segment 53, may be arc-shaped transition sections, thereby helping to reduce damage to the paper.

[0054] Therefore, when the paper comes into contact with the first connecting section 51, it can slide down along the inclined first connecting section 51, thereby reducing the probability of paper jams in the printer. Furthermore, the inclined third connecting section 53 can guide the movement of the paper, allowing it to move more effectively to the first guide protrusion 4. In addition, it also helps to reduce the manufacturing cost of the second guide protrusion 5.

[0055] For example, in the arrangement direction of the base 1 and the cover 2, the orthographic projection of the third connecting segment 53 on the plane where the first guide protrusion 4 is located can overlap with the first guide protrusion 4. Thus, the gap between the third connecting segment 53 and a portion of the first guide protrusion 4 can form a guide channel, thereby facilitating the movement of paper from the second guide protrusion 5 to the first guide protrusion 4.

[0056] Please continue reading. Figure 1 and Figure 2 In some embodiments, the end of the cover 2 facing the base 1 is provided with a guide groove 54. The guide groove 54 is recessed in a direction away from the base 1. The guide groove 54 is directly opposite the first guide protrusion 4. The gap between the guide groove 54 and the first guide protrusion 4 forms part of the paper feeding channel 3. The guide groove 54 and the second guide protrusion 4 may be located on the same side of the paper feeding channel 3, and the extending direction of the guide groove 54 may be the same as the extending direction of the first guide protrusion 4.

[0057] Therefore, the guide groove 54 and the first guide protrusion 4 can better stretch the paper, thereby helping to reduce the possibility of paper wrinkles during printing.

[0058] Please continue reading. Figure 1 and Figure 2In some embodiments, the surface of the base 1 facing the cover 2 has a second guide surface 55. A third connecting segment 53 is connected to the bottom wall 541 of the guide groove 54 via the second guide surface 55. Both the second guide surface 55 and the guide groove 54 are directly opposite the first guide protrusion 4. The distance between the second guide surface 55 and the first guide protrusion 4 is greater than the distance between the bottom wall 541 of the guide groove 54 and the first guide protrusion 4. Specifically, in the arrangement direction of the base 1 and the cover 2, the distance between the plane containing the second guide surface 55 and the plane containing the first guide protrusion 4 is greater than the distance between the plane containing the bottom wall 541 of the guide groove 54 and the plane containing the first guide protrusion 4.

[0059] Therefore, when the paper moves from the second guide protrusion 5 to the first guide protrusion 4, the second guide surface 55 can provide sufficient clearance for the paper to move to the free end of the second guide protrusion 5, so that the paper can move to the free end of the second guide protrusion 5 more smoothly, thereby improving the printing reliability of the printer 100.

[0060] Please continue reading. Figure 1 and Figure 2 In some embodiments, the end of the cover 2 facing the base 1 has a relief groove 56. The relief groove 56 is located on the side of the first connecting section 51 near the paper inlet 31. The relief groove 56 is recessed away from the base 1. Since the paper is placed on the base 1 when the printer 100 is printing, other components can be arranged in the relief groove 56, such as a component for abutting the paper, which helps to optimize the structural layout of the printer 100.

[0061] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0062] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0063] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0064] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included 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 printer includes: a base, a cover, and a drive roller; The cover is movably disposed on the base; The base has a first guide protrusion at one end facing the cover, and the first guide protrusion protrudes in a direction close to the cover; The drive roller is rotatably disposed at one end of the base near the cover. The cover has a second guide protrusion at one end near the base, and the second guide protrusion protrudes towards the base; in the paper feeding direction of the printer, the second guide protrusion and the first guide protrusion are staggered, and both the second guide protrusion and the first guide protrusion are located upstream of the drive roller; When the cover is placed on the base, a paper feeding channel is formed between the base and the cover. The paper feeding channel has a paper inlet and a paper outlet, which are located at both ends of the cover. The first guide protrusion and the second guide protrusion are located on both sides of the paper feeding channel. In a direction perpendicular to the paper feeding channel, the free end of the second guide protrusion is lower than the free end of the first guide protrusion.

2. The printer according to claim 1, characterized in that, The surface of the first guide protrusion includes a first extension and a second extension connected together. In the direction from the paper inlet to the paper outlet, the first extension is inclined toward the cover, and the second extension is inclined away from the end of the first extension near the paper outlet.

3. The printer according to claim 2, characterized in that, Both the first extension segment and the second extension segment are bent into an arc shape.

4. The printer according to claim 3, characterized in that, The center lines of the first extension segment and the second extension segment are parallel or collinear.

5. The printer according to claim 3 or 4, characterized in that, The base has a side panel adjacent to the cover that protrudes towards the cover to form the first guide protrusion, and defines an avoidance groove on the side opposite to the cover. The printer includes a motor, a portion of which is located within the clearance recess.

6. The printer according to claim 2 or 3, characterized in that, The base has a first guide plane on its surface facing the cover, the first guide plane extending from the first extension to the paper inlet.

7. The printer according to claim 1, characterized in that, The surface of the second guide protrusion includes a first connecting segment, a second connecting segment, and a third connecting segment connected sequentially in the paper feeding direction. The second connecting segment is used to abut against the paper in the paper feeding channel. In the direction from the base to the cover, the first connecting segment and the third connecting segment are inclined in a direction away from each other.

8. The printer according to claim 7, characterized in that, A guide groove is provided at one end of the cover near the base. The guide groove is recessed in a direction away from the base and is directly opposite the first guide protrusion.

9. The printer according to claim 8, characterized in that, The base has a second guide surface facing the cover. The third connecting segment is connected to the bottom wall of the guide groove through the second guide surface. Both the second guide surface and the guide groove are directly opposite the first guide protrusion. The distance between the second guide surface and the first guide protrusion is greater than the distance between the bottom wall of the guide groove and the first guide protrusion.

10. The printer according to claim 7, characterized in that, The end of the cover facing the base has a relief groove, which is located on the side of the first connecting section near the paper inlet and is recessed away from the base.

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