Label paper printer

Abstract

The utility model discloses a label paper printer, which comprises a printer main body, an upper cover and a paper tearing knife, a paper bin for accommodating label paper is formed in the printer main body, the upper cover is hinged with the printer main body and is used for opening or closing the paper bin, and a paper feeding channel and a paper tearing space which are mutually spaced and sequentially communicated are formed between the upper cover and the printer main body. The paper feeding channel communicates with the paper bin, and the paper tearing knife is partially connected to the printer body, partially extends to the paper tearing space, can abut against the label paper and is used for cutting off the label paper. The utility model can effectively solve the problem that the paper cutting mechanism is exposed out of the machine body, so that fingers of a user are cut accidentally when the label paper is torn, and potential safety hazards exist.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, specifically to a label paper printer. Background Technology

[0002] In existing label printers, if the paper cutting mechanism is exposed outside the machine body when the user finishes printing and cuts the label paper with the paper cutter, the user may accidentally cut their finger, or children may accidentally touch it and be cut. If the paper cutter is hidden inside the machine body, the label paper is difficult to cut smoothly along the preset edge, the user needs to adjust the tearing angle, and the label paper is easily torn, causing unnecessary waste.

[0003] Therefore, there is an urgent need for a label printer that can solve the problem of users accidentally cutting their fingers when tearing labels because the paper cutting mechanism is exposed outside the machine body in existing technology, thus posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a label paper printer that solves the technical problem in the prior art where the paper cutting mechanism is exposed outside the machine body, causing users to accidentally cut their fingers when tearing the label paper, thus posing a safety hazard.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a label paper printer, comprising:

[0007] The printer body has a paper tray for holding label paper;

[0008] The top cover, hinged to the printer body, is used to open or close the paper tray. A paper feed channel and a tearing space are formed between the top cover and the printer body, spaced apart and sequentially connected. The paper feed channel is connected to the paper tray.

[0009] A paper tearer is partially connected to the printer body and partially extends into the tearing space, and can abut against the label paper for cutting the label paper.

[0010] In some embodiments, the printer body has a mounting groove that is connected to the paper feed channel and forms the tearing space together with the top cover. An inner support surface is formed on one side of the mounting groove. The tearing blade has a connecting end and a cutting edge. The connecting end of the tearing blade is detachably connected to the inner support surface, and the cutting edge extends in a direction away from the inner support surface and is inclined upward, and can abut against the label paper.

[0011] In some embodiments, the paper tearer includes a plurality of sequentially arranged cutting teeth in a serrated shape, the plurality of cutting teeth being arranged at intervals along the length direction of the blade tip of the paper tearer.

[0012] In some embodiments, the cutting teeth are arranged at a height that gradually decreases along the direction near the center of the paper tearer, and are formed with a concave arc.

[0013] In some embodiments, the tangent angle of the concave arc is between 0.6° and 4.6°.

[0014] In some embodiments, the depth of the concave arc is 0.3 mm.

[0015] In some embodiments, the label printer further includes a printhead and a rubber roller, the printhead being disposed on the paper feed path of the label paper and connected to either the printer body or the top cover, and the rubber roller being disposed opposite the printhead on the paper feed path of the label paper and connected to the other of the printer body or the top cover.

[0016] In some embodiments, the length of the cutting edge of the paper tearer is greater than the length of the print head, and the distance between the edge of the cutting edge of the paper tearer and the edge of the print head is 2-3 mm.

[0017] In some embodiments, the printer body has at least one card slot, and the label printer further includes a locking structure, which is disposed opposite to the card slot and connected to the top cover, and the locking structure can engage with the card slot.

[0018] In some embodiments, the engaging structure includes a slider, at least one hook, and at least one elastic part. The slider is rotatably connected to the upper cover. The hook is disposed opposite to the slot and connected to the slider. The hook can be inserted into the slot. The elastic part is disposed on the rotation path of the hook, and one end of the elastic part is connected to the upper cover and the other end is connected to the hook. It is used to push the hook to rotate relative to the upper cover and then automatically reset, so as to realize the engagement of the hook with the slot.

[0019] In some embodiments, the slot has a first limiting end, and the hook has a first abutting surface relative to the first limiting end, the first abutting surface being able to abut against the first limiting end to restrict the hook from sliding out relative to the slot.

[0020] In some embodiments, the top cover has a second limiting end, and the hook has a second abutting surface relative to the second limiting end. When the first abutting surface abuts against the first limiting end, the second abutting surface abuts against the second limiting end, thereby limiting the depth of the hook inserted into the slot.

[0021] In some embodiments, the first limiting end has a wedge-shaped surface, and the hook has at least one slope relative to the wedge-shaped surface of the first limiting end, the slope having an inclination angle of 35 to 55°.

[0022] In some embodiments, the printhead is movably connected to the top cover, allowing the printhead to have an adjustable angle and position relative to the top cover.

[0023] In some embodiments, the height at which the blade tip of the paper tearer abuts against the label paper is greater than the height of the plane containing the vertex of the inner support surface.

[0024] In some embodiments, the blade tip of the paper tearer extends 0.2 to 0.5 mm away from the inner support surface, and the angle between the blade tip of the paper tearer and the label paper is 70 to 110°.

[0025] Compared with the prior art, the beneficial effects of the label paper printer provided by this utility model include: a paper tray for holding label paper is formed inside the printer body, the top cover is hinged to the printer body, and a paper feeding channel and a tearing space are formed between the top cover and the printer body, which are spaced apart and connected in sequence. The paper feeding channel is connected to the paper tray and is used for feeding label paper. The tearing blade is partially connected to the printer body and partially extends into the tearing space. When the tearing blade comes into contact with the label paper, it can be used to cut the label paper. Compared to existing technologies, this new technology creates a paper feed channel between the top cover and the printer body, connecting the paper tray and the tearing space. This allows the label paper to enter the tearing space along the paper feed channel. The tearing blade extends partially into the tearing space to connect with the printer body, and it can come into contact with the label paper. This allows the user to easily cut the label paper after applying external force without cutting their fingers. This solves the technical problem in existing technologies where the paper cutting mechanism is exposed outside the machine body, causing users to accidentally cut their fingers while tearing the label paper, thus posing a safety hazard. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of a label paper printer provided in an embodiment of the present invention;

[0027] Figure 2 This is a three-dimensional structural schematic diagram of a label paper printer from another perspective, provided in an embodiment of this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the printer body connected to the rubber roller and the paper tearing blade according to an embodiment of the present invention;

[0029] Figure 4 It is along Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 This is a three-dimensional structural schematic diagram of a label paper printer from another perspective provided by an embodiment of this utility model;

[0031] Figure 6 It is along Figure 5 Enlarged view of point B in the middle;

[0032] Figure 7 This is a schematic diagram of the connection structure between the printer body and the paper tearer provided in this embodiment of the utility model;

[0033] Figure 8 This is a cross-sectional view of the printer body, top cover, and locking structure according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] Printer body 1; paper tray 11; paper feed path 12; paper tearing space 13; inner support surface 14; locking post 15; card slot 16; first limiting end 161; wedge-shaped surface 162; top cover 2; second limiting end 21; paper tearing blade 3; connecting end 31; blade end 32; cutting teeth 321; concave arc 322; print head 4; rubber roller 5; locking structure 6; sliding part 61; hook 62; first abutting surface 621; second abutting surface 622; slope 623; elastic part 63. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] To address the technical problem of users accidentally cutting their fingers while tearing labels due to the paper cutting mechanism being exposed outside the machine body, thus posing a safety hazard, this utility model provides a label printer. It achieves this by forming a paper feeding channel 12 between the top cover 2 and the printer body 1, which connects to the paper tray 11 and the tearing space 13. This allows the label paper to enter the tearing space 13 along the paper feeding channel 12. The tearing blade 3 is connected to the printer body 1 by partially extending into the tearing space 13, and the tearing blade 3 can abut against the label paper, allowing the user to easily cut the label paper after applying external force without causing finger cuts.

[0038] It should be noted that the label paper printer described in this utility model is used in, but not limited to, the field of printer technology. For ease of explanation, this utility model only uses the label paper printer applied to the field of printer technology as an example for explanation. The principle of the label paper printer applied to other types of equipment is essentially the same as that applied to the field of printer technology, and will not be described in detail here.

[0039] Please see Figures 1 to 8 , Figures 1 to 5 According to one embodiment of the present invention, a label paper printer includes: a printer body 1, a top cover 2, and a paper tearing blade 3. The printer body 1 has a paper tray 11 for accommodating label paper. The top cover 2 is hinged to the printer body 1 and is used to open or close the paper tray 11. A paper feeding channel 12 and a paper tearing space 13 are formed between the top cover 2 and the printer body 1, which are spaced apart from each other and connected in sequence. The paper feeding channel 12 is connected to the paper tray 11. The paper tearing blade 3 is partially connected to the printer body 1 and partially extends into the paper tearing space 13, and can abut against the label paper for cutting the label paper.

[0040] In this device, a paper tray 11 for holding label paper is formed inside the printer body 1. The upper cover 2 is hinged to the printer body 1. A paper feeding channel 12 and a tearing space 13 are formed between the upper cover 2 and the printer body 1, which are spaced apart from each other and connected in sequence. The paper feeding channel 12 is connected to the paper tray 11 and is used for feeding label paper. The tearing blade 3 is partially connected to the printer body 1 and partially extends into the tearing space 13. When the tearing blade 3 comes into contact with the label paper, it can be used to cut the label paper.

[0041] Compared to existing technologies, by forming a paper feeding channel 12 between the top cover 2 and the printer body 1, which is connected to the paper tray 11 and the tearing space 13, the label paper can enter the tearing space 13 along the paper feeding channel 12. The tearing blade 3 is connected to the printer body 1 by partially extending into the tearing space 13, and the tearing blade 3 can abut against the label paper, so that the user can easily cut the label paper after applying external force without causing the user's fingers to be cut. This solves the technical problem in existing technologies where the paper cutting mechanism is exposed outside the machine body, causing users to accidentally cut their fingers when tearing the label paper, thus posing a safety hazard.

[0042] Specifically, in this device, the projection of the outermost edge of the paper tearer 3 cannot exceed the edge of the upper cover 2 or the printer body 1 after the upper cover 2 is closed with the printer body 1, thereby ensuring that the paper tearer 3 is hidden in the paper tearing space.

[0043] Furthermore, a paper tray 11 for holding label paper is formed inside the printer body 1. The label paper is wound on the roll and enters the tearing space 13 through the paper feeding channel 12 under the action of traction. The user applies external force to the label paper to tear off the printed label. The printer body 1 and the top cover 2 are conventional settings known to those skilled in the art, and will not be described in detail here.

[0044] In this embodiment, as Figure 2 As shown, the printer body 1 has an installation slot, which is connected to the paper feeding channel 12 and forms a paper tearing space 13 with the top cover 2. An inner support surface 14 is formed on one side of the installation slot. The paper tearing blade 3 has a connecting end 31 and a blade end 32. The connecting end 31 of the paper tearing blade 3 is detachably connected to the inner support surface 14, and the blade end 32 extends in a direction away from the inner support surface 14 and is inclined upward, and can abut against the label paper.

[0045] The printer body 1 has a mounting groove for installing the paper tearer 3. An inner support surface 14 is formed on one side of the mounting groove. The connecting end 31 of the paper tearer 3 is detachably connected to the inner support surface 14, thereby realizing a partial connection between the paper tearer 3 and the printer body 1.

[0046] Furthermore, multiple cylindrical snap-fit ​​posts 15 are formed on the inner support surface 14. The connecting end 31 of the paper tearer 3 has an installation hole relative to the snap-fit ​​post 15. The connecting end 31 of the paper tearer 3 is sleeved on the snap-fit ​​post 15 through the installation hole and is press-fitted with the snap-fit ​​post 15 to achieve a detachable connection.

[0047] In one embodiment, please refer to Figure 4 , Figure 7The connecting end 31 of the paper tearer 3 can also be connected to the inner support surface 14 by bolts or screws, which will not be described in detail here.

[0048] In one embodiment, please refer to Figure 4 The paper tearer 3 includes a plurality of sequentially arranged cutting teeth 321, which are serrated. The plurality of cutting teeth 321 are arranged at intervals along the length direction of the blade end 32 of the paper tearer 3.

[0049] With multiple cutting teeth 321 arranged at intervals, when the label paper comes into contact with the multiple cutting teeth 321, the multiple cutting teeth 321 can generate a shearing force on the label paper under the action of external force and cut it.

[0050] In one embodiment, please refer to Figure 4 The height of the cutting teeth 321 gradually decreases along the direction close to the middle of the paper tearer 3, and forms an inward concave arc 322.

[0051] By setting the blade end 32 of the paper tearer 3, which is high on both sides and low in the middle, the blade end 32 of the paper tearer 3 has an inward concave arc 322 in the middle for avoidance.

[0052] Furthermore, when the label paper to be printed has a special model and specification, such as the adhesive children's wristbands in hospitals, the face paper of the wristband label paper has adhesive backing and needs to be quickly attached to the wrist of the child patient through adhesive. When the paper is returned, the blade tip 32 of the tearing knife 3 is easy to scratch the adhesive backing, affecting the adhesion of the wristband and making it difficult for medical staff to work. Therefore, setting the concave arc 322 can effectively prevent the blade tip 32 of the tearing knife 3 from easily scratching the adhesive backing.

[0053] In one embodiment, the tangent angle of the concave arc 322 is between 0.6° and 4.6°.

[0054] When the tangent angle of the concave arc 322 is 2.6°, it can not only effectively prevent the blade tip 32 of the paper tearer 3 from easily scratching the adhesive, but also ensure that the paper tearer 3 can smoothly cut the label paper.

[0055] In one embodiment, the depth of the concave arc 322 is 0.3 mm.

[0056] The height difference between the cutting teeth 321 on both sides and the cutting teeth 321 in the middle is less than 0.5mm, and the height difference is best when it is 0.3mm. This not only effectively prevents the blade tip 32 of the paper tearer 3 from scratching the adhesive, but also ensures that the paper tearer 3 can cut the label paper smoothly.

[0057] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the device also includes a print head 4 and a rubber roller 5. The print head 4 is disposed on the paper feed path of the label paper and connected to either the printer body 1 or the top cover 2. The rubber roller 5 is disposed relative to the print head 4 on the paper feed path of the label paper and connected to the other of the printer body 1 or the top cover 2.

[0058] By setting the print head 4 and the rubber roller 5 on the paper path, the label paper is printed with printing information. The print head 4 and the rubber roller 5 are conventional settings known to those skilled in the art, and will not be described in detail here.

[0059] In one embodiment, the length of the blade tip 32 of the paper tearer 3 is greater than the length of the print head 4, and the distance between the edge of the blade tip 32 of the paper tearer 3 and the edge of the print head 4 is 2-3 mm.

[0060] The length of the blade tip 32 of the paper tearer 3 is greater than the width of the print head 4. In order to ensure that the print head 4 can print the information onto the label paper, the length of the print head 4 is greater than the width of the label paper. Therefore, the length of the blade tip 32 of the paper tearer 3 is greater than the width of the label paper, which can effectively ensure smooth paper tearing.

[0061] Furthermore, the distance between the edge of the blade tip 32 of the paper tearer 3 and the edge of the print head 4 is 2-3mm, which can prevent the user from accidentally touching the blade tip 32 of the paper tearer 3 and improve safety.

[0062] In this embodiment, as Figures 5 to 8 As shown, the printer body 1 has at least one card slot 16. The label printer also includes a locking structure 6, which is disposed opposite to the card slot 16 and connected to the upper cover 2. The locking structure 6 can lock into the card slot 16.

[0063] The upper cover 2 and the printer body 1 are connected by a snap-fit ​​structure 6, which ensures the fit between the print head 4 and the rubber roller 5 and ensures the normal operation of the printer.

[0064] In one embodiment, please refer to Figure 6 , Figure 8 The engaging structure 6 includes a sliding member 61, at least one hook 62, and at least one elastic part 63. The sliding member 61 is rotatably connected to the upper cover 2. The hook 62 is disposed opposite to the slot 16 and connected to the sliding member 61. The hook 62 can be inserted into the slot 16. The elastic part 63 is disposed on the rotation path of the hook 62, and one end of the elastic part 63 is connected to the upper cover 2 and the other end is connected to the hook 62. It is used to push the hook 62 to rotate relative to the upper cover 2 and then automatically reset, so as to realize the engagement of the hook 62 with the slot 16.

[0065] The hook 62 is rotatably connected to the upper cover 2 through the sliding member 61. At the same time, the elastic restoring force generated by the elastic part 63 can push the hook 62 to automatically reset after rotating relative to the upper cover 2, thereby ensuring that the hook 62 can engage with the slot 16.

[0066] Furthermore, the elastic part 63 here is a spring that is common and readily available on the market, which is a conventional setting known to those skilled in the art, and will not be described in detail here.

[0067] In one embodiment, please refer to Figure 8 The slot 16 has a first limiting end 161, and the hook 62 has a first abutting surface 621 relative to the first limiting end 161. The first abutting surface 621 can abut against the first limiting end 161 to limit the hook 62 from sliding out relative to the slot 16.

[0068] When the first contact surface 621 on the hook 62 abuts against the first limiting end 161 in the slot 16, the hook 62 and the slot 16 can be engaged.

[0069] In one embodiment, please refer to Figure 8 The upper cover 2 has a second limiting end 21, and the hook 62 has a second abutting surface 622 relative to the second limiting end 21. When the first abutting surface 621 abuts against the first limiting end 161, the second abutting surface 622 abuts against the second limiting end 21 to limit the depth of the hook 62 inserted into the slot 16.

[0070] The hook 62 also has a second abutting surface 622. When the first abutting surface 621 on the hook 62 abuts against the first limiting end 161 in the slot 16, the second abutting surface 622 abuts against the second limiting end 21. At this time, the depth of the hook 62 inserted into the slot 16 can be limited, and the engagement effect between the hook 62 and the slot 16 can be improved.

[0071] Specifically, such as Figure 6 , Figure 8 As shown, the upper cover 2 has a connecting groove that allows the hook to pass through, and the second limiting end 21 is formed on the inner wall of the connecting groove.

[0072] Furthermore, a pressing member connected to the slider 61 is used here, which can drive the slider 61 and the hook 62 to rotate in a direction away from the first limiting end 161. When the user continues to apply pressing force, the hook 62 continues to rotate and overcomes the elastic restoring force generated by the elastic part 63 until the first abutting surface 621 is released from abutting with the first limiting end 161 and the second abutting surface 622 is released from abutting with the second limiting end 21.

[0073] In one embodiment, please refer to Figure 8The first limiting end 161 has a wedge-shaped surface 162, and the hook 62 has at least one slope 623 relative to the wedge-shaped surface 162 of the first limiting end 161, with the slope 623 having an inclination angle of 35 to 55°.

[0074] The slope 623 of the hook 62 and the wedge-shaped surface 162 of the first limiting end 161 are configured to cooperate. When the hook 62 is inserted into the slot 16, the slope 623 of the hook 62 abuts against the wedge-shaped surface 162 of the first limiting end 161 and slides against each other, which is conducive to the rotation of the hook 62 and makes it convenient for the user to operate.

[0075] Furthermore, the inclination angle of the slope 623 is 35 to 55°, with 45° being optimal. This not only makes it easier for the user to insert the hook 62 into the slot 16, but also prevents interference between the first limiting end 161 and the first contact surface 621 of the hook 62.

[0076] In one embodiment, the print head 4 is movably connected to the upper cover 2, so that the print head 4 has an adjustable angle and position relative to the upper cover 2.

[0077] The print head 4 can move relative to the upper cover 2, thereby ensuring that the print head 4 can better adhere the label paper to the rubber roller 5 during printing, which improves the clarity and effect of printing.

[0078] In one embodiment, please refer to Figure 7 The height at which the blade tip 32 of the paper tearer contacts the label is greater than the height of the plane containing the vertex of the inner support surface 14.

[0079] By setting the height at which the blade tip 32 of the tearing knife 3 contacts the label paper to be greater than the height of the plane where the vertex of the inner support surface 14 is located, the user can cut the label paper with less force, thus achieving a labor-saving effect.

[0080] In one embodiment, the blade tip 32 of the paper tearer 3 extends 0.2 to 0.5 mm away from the inner support surface 14, and the angle between the blade tip 32 of the paper tearer 3 and the label paper is 70 to 110°.

[0081] By setting the length of the blade tip 32 of the tearing knife 3 extending away from the inner support surface 14 to 0.2 to 0.5 mm, and the angle between the blade tip 32 of the tearing knife 3 and the label paper to 70 to 110°, it is possible for users to cut the label paper with less force, thus achieving a labor-saving effect.

[0082] To better understand this utility model, the following is combined with... Figures 1 to 8 The technical solution of this utility model is described in detail below:

[0083] The printer body 1 has a paper tray 11 for holding label paper. The upper cover 2 is hinged to the printer body 1. A paper feed channel 12 and a tearing space 13 are formed between the upper cover 2 and the printer body 1, which are spaced apart and connected in sequence. The paper feed channel 12 is connected to the paper tray 11 and is used for feeding label paper. The tearing blade 3 is partially connected to the printer body 1 and partially extends into the tearing space 13. When the tearing blade 3 comes into contact with the label paper, it can be used to cut the label paper. Compared with the prior art, by forming a paper feed channel 12 between the upper cover 2 and the printer body 1 that is connected to the paper tray 11 and the tearing space 13, the label paper can enter the tearing space 13 along the paper feed channel 12. The tearing blade 3 is connected to the printer body 1 by partially extending into the tearing space 13, and the tearing blade 3 can come into contact with the label paper, so that the user can easily cut the label paper after applying external force without causing the user's fingers to be cut.

[0084] In the specific working process of this utility model, the user first loads the label paper wound on the roll into the paper tray 11, and guides the label paper to the rubber roller 5 along the guide of the paper feeding channel 12. Then, the upper cover 2 is closed on the printer body 1. Then, the rubber roller 5 rotates and drives the label paper to feed. The print head 4 prints the printing information on the label paper. At the same time, the printed label paper enters the tearing space 13. Finally, the user pulls the label paper so that the label paper abuts against the blade end 32 of the tearing knife 3. Under the action of appropriate external force, the label paper can be easily cut. It is not only safe and convenient but also simple to operate.

[0085] This device, through the aforementioned structure, can solve the technical problem in the prior art where the paper cutting mechanism is exposed outside the machine body, causing users to accidentally cut their fingers when tearing the label paper, thus posing a safety hazard.

[0086] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A label paper printer, characterized in that, include: The printer body has a paper tray for holding label paper; The top cover is hinged to the printer body and is used to open or close the paper tray. A paper feeding channel and a paper tearing space are formed between the top cover and the printer body, which are spaced apart from each other and connected in sequence. The paper feeding channel is connected to the paper tray. as well as A paper tearer is partially connected to the printer body and partially extends into the tearing space, and can abut against the label paper for cutting the label paper.

2. The label printer according to claim 1, characterized in that, The printer body has an installation slot that is connected to the paper feeding channel and forms the tearing space together with the top cover. An inner support surface is formed on one side of the installation slot. The tearing knife has a connecting end and a cutting edge. The connecting end of the tearing knife is detachably connected to the inner support surface, and the cutting edge extends away from the inner support surface and is inclined upward, and can abut against the label paper.

3. The label printer according to claim 1, characterized in that, The paper tearing knife includes a plurality of sequentially arranged cutting teeth in a serrated shape, and the plurality of cutting teeth are arranged at intervals along the length direction of the blade end of the paper tearing knife.

4. The label printer according to claim 3, characterized in that, The cutting teeth are set at a height that gradually decreases along the direction close to the center of the paper tearing blade, and form an inward concave arc.

5. The label printer according to claim 4, characterized in that, The tangent angle of the concave arc is between 0.6° and 4.6°.

6. The label printer according to claim 4, characterized in that, The depth of the concave arc is 0.3 mm.

7. The label printer according to claim 3, characterized in that, It also includes a printhead and a rubber roller, wherein the printhead is disposed on the paper feed path of the label paper and connected to either the printer body or the top cover, and the rubber roller is disposed relative to the printhead on the paper feed path of the label paper and connected to the other of the printer body or the top cover.

8. The label printer according to claim 7, characterized in that, The length of the cutting edge of the paper tearer is greater than the length of the print head, and the distance between the edge of the cutting edge of the paper tearer and the edge of the print head is 2-3 mm.

9. The label printer according to claim 3, characterized in that, The printer body has at least one card slot, and the label printer also includes a locking structure. The locking structure is disposed opposite to the card slot and connected to the upper cover, and the locking structure can lock into the card slot.

10. The label paper printer according to claim 9, characterized in that, The engaging structure includes a sliding member, at least one hook, and at least one elastic part. The sliding member is rotatably connected to the upper cover. The hook is disposed opposite to the slot and connected to the sliding member. The hook can be inserted into the slot. The elastic part is disposed on the rotation path of the hook, and one end of the elastic part is connected to the upper cover and the other end is connected to the hook. It is used to push the hook to rotate relative to the upper cover and then automatically reset, so as to realize the engagement of the hook with the slot.

11. The label paper printer according to claim 10, characterized in that, The slot has a first limiting end, and the hook has a first abutting surface relative to the first limiting end. The first abutting surface can abut against the first limiting end to restrict the hook from sliding out of the slot.

12. The label paper printer according to claim 11, characterized in that, The upper cover has a second limiting end, and the hook has a second abutting surface relative to the second limiting end. When the first abutting surface abuts against the first limiting end, the second abutting surface abuts against the second limiting end, which is used to limit the depth of the hook inserted into the slot.

13. The label paper printer according to claim 11, characterized in that, The first limiting end has a wedge-shaped surface, and the hook has at least one slope relative to the wedge-shaped surface of the first limiting end, the slope having an inclination angle of 35 to 55°.

14. The label printer according to claim 7, characterized in that, The printhead is movably connected to the upper cover, allowing the printhead to have an adjustable angle and position relative to the upper cover.

15. The label printer according to claim 2, characterized in that, The height at which the blade tip of the paper tearer contacts the label paper is greater than the height of the plane containing the vertex of the inner support surface.

16. The label printer according to claim 2, characterized in that, The blade tip of the paper tearer extends 0.2 to 0.5 mm away from the inner support surface, and the angle between the blade tip of the paper tearer and the label paper is 70 to 110°.

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