Printer with NFC functionality

Abstract

The utility model relates to a kind of printer with NFC function, it includes: lower shell, upper shell, NFC coil and circuit board.Upper shell is located above lower shell, and is detachably connected with lower shell, and paper bin is equipped in upper shell, and upper shell is provided with paper outlet, and paper outlet is respectively communicated with paper bin and outside.NFC coil is arranged in lower shell, and is pressed on the bottom surface of lower shell by upper shell, and NFC coil is located directly below paper bin.Circuit board is installed in lower shell, and is horizontally side by side with paper bin and is oppositely arranged, and circuit board is electrically connected with NFC coil.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, and more specifically, to a printer with NFC functionality. Background Technology

[0002] A printer is a device that uses technologies such as inkjet, laser, and thermal to convert digital information into paper or physical media. With the continuous development of technology, printers with integrated NFC (Near Field Communication) technology are now available on the market. The purpose of this technology is to enable rapid interaction between devices, thereby simplifying the printing process and improving security.

[0003] The prior art discloses a portable label printer, which includes a housing, buttons, and an NFC reader / writer chip. The housing contains a circuit board, and the buttons and the NFC reader / writer chip are embedded on the top surface of the housing. The buttons are arranged in a corresponding manner to the key positions on the circuit board, and the NFC reader / writer chip is arranged close to the buttons. Specifically, when an NFC-enabled device or card is placed on the area where the NFC reader / writer chip is located, the printer can read the information and perform the printing action.

[0004] However, on the one hand, the NFC read / write chip is exposed in the casing and is easily affected by external environmental interference, which may affect the printer's wireless communication performance. On the other hand, the arrangement of the NFC read / write chip, buttons, and circuit board may cause the NFC read / write chip to be affected by interference from the circuit board, resulting in signal attenuation, which in turn further affects the printer's wireless communication performance. Utility Model Content

[0005] The purpose of this invention is to provide a printer with NFC functionality, and the technical problem it solves is: how to improve the wireless communication effect.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0007] This utility model provides a printer with NFC function, comprising: a lower housing; an upper housing located above the lower housing and detachably connected to the lower housing, the upper housing having a paper tray and a paper outlet that communicates with the paper tray and the outside; an NFC coil disposed within the lower housing and pressed against the bottom surface of the lower housing by the upper housing, the NFC coil being located directly below the paper tray; and a circuit board installed within the lower housing and arranged horizontally opposite to the paper tray, the circuit board being electrically connected to the NFC coil.

[0008] In some embodiments of this application, the lower housing includes a lower housing body and a battery cover. The lower housing body has a battery slot, which holds a battery. The bottom surface of the lower housing body has a slot communicating with the battery slot. The battery cover is used to close or open the slot. The circuit board is located directly above the battery slot and is electrically connected to the battery.

[0009] In some embodiments of this application, the NFC coil includes a connecting portion and a main body. The connecting portion has a stepped structure and includes a first connecting strip, a second connecting strip, and a third connecting strip. The first connecting strip and the second connecting strip both extend along the horizontal direction and extend in opposite directions and are staggered. The third connecting strip extends vertically. The two ends of the first connecting strip are respectively connected to the circuit board and the upper end of the third connecting strip. The two ends of the second connecting strip are respectively connected to the main body and the lower end of the third connecting strip. The main body is pressed against the bottom surface of the lower housing by the upper housing and is located directly below the paper tray.

[0010] In some embodiments of this application, the battery slot includes a first slot plate, a second slot plate, and a third slot plate. The first slot plate and the second slot plate both extend vertically and are arranged side by side in the horizontal direction. The third slot plate extends horizontally and is connected to the first slot plate and the second slot plate, respectively. The first connecting strip is located vertically between the circuit board and the third slot plate and is connected to the bottom of the circuit board. The third connecting strip and the second slot plate are arranged side by side in the horizontal direction.

[0011] In some embodiments of this application, the printer with NFC functionality further includes a paper limiting mechanism. The paper limiting mechanism includes a first baffle, a second baffle, a first rack, a second rack, and a transmission component. The first baffle and the second baffle are both located within the paper tray, forming a paper limiting space between them. The first rack and the second rack are respectively connected to the first baffle and the second baffle. The transmission component has gear teeth and meshes with the first rack and the second rack through the gear teeth. The transmission component is rotatably connected to the upper housing. The transmission component rotates relative to the upper housing to drive the first rack and the second rack to move horizontally, and to move the first baffle and the second baffle closer together or further apart, thereby increasing or decreasing the paper limiting space.

[0012] In some embodiments of this application, the paper tray has two grooves extending along a first direction, and the two grooves are respectively located on both sides of the transmission member in the first direction; the first rack and the second rack extend along the first direction and are respectively located on both sides of the transmission member in a second direction, and the second direction is perpendicular to the first direction; the transmission member, the first rack and the second rack are all located outside the paper tray, and the first baffle and the second baffle pass through the two grooves respectively to connect with the first rack and the second rack respectively.

[0013] In some embodiments of this application, the paper limiting mechanism further includes a fixing member, and the upper housing is provided with a fixing hole and a fixing groove; the transmission member is a damper, and the transmission member includes a fixing part and a rotating part rotatably connected to the fixing part. The fixing member is a bolt, which passes through the fixing part and is locked in the fixing hole, and the rotating part is rotatably connected to the upper housing. Alternatively, the transmission member is a gear, the fixing member is a bracket, the fixing member is located on the side of the transmission member facing away from the upper housing, and is provided with a fixing block extending towards the side of the upper housing. The fixing block engages with the fixing groove, and the transmission member is rotatably connected to the bracket.

[0014] In some embodiments of this application, a printing unit is further included, the printing unit including a print head and a printing roller, the print head being installed inside the lower housing; the upper housing includes an upper housing body and a flip cover, the upper housing body having the paper tray, the flip cover having the printing roller and being hinged to the upper housing body, the flip cover rotating relative to the upper housing body to open or close the paper tray, when the flip cover closes the paper tray, the paper outlet is formed between the flip cover and the upper housing body, the printing roller is disposed opposite to the print head, and a paper feeding channel is formed between the printing roller and the print head, respectively communicating with the paper tray and the paper outlet.

[0015] In some embodiments of this application, the NFC-enabled printer further includes an interaction module located directly above the circuit board and comprising a support frame, buttons, and a display screen. The support frame is fixed to the side of the upper housing facing the circuit board and has mounting holes and a support plate. The buttons include a button body and a force-applying column. The button body is embedded in the upper housing, and the force-applying column passes through the mounting holes and abuts against the key on the circuit board. The display screen is embedded in the upper housing, abuts against the support plate, and is located directly above the support plate.

[0016] In some embodiments of this application, waterproof foam is provided between the button body and the side of the upper housing facing the circuit board.

[0017] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects:

[0018] In this embodiment of the NFC-enabled printer, the paper tray stores printing paper. When an NFC-enabled device approaches the printer, the NFC coil, pressed against the bottom surface of the lower housing, wirelessly communicates with the device to obtain printing information. Subsequently, the circuit board outputs a printing command, the printing paper in the paper tray is fed out and printed, and the printed paper is ejected from the paper output port. Since the NFC coil is located directly below the paper tray, and the circuit board and paper tray are arranged side-by-side in the horizontal direction, the structure forming the paper tray in the upper housing acts as a barrier between the circuit board and the NFC coil, effectively reducing signal attenuation caused by interference from the circuit board, thereby improving wireless communication performance. Furthermore, since the upper and lower housings are detachably connected, and the NFC coil is pressed against the bottom surface of the lower housing by the upper housing, the lower and upper housings effectively enclose the NFC coil, reducing interference from the external environment and further improving wireless communication performance. Attached Figure Description

[0019] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0020] Figure 1 This is a schematic diagram of a printer with NFC functionality, shown according to an exemplary embodiment.

[0021] Figure 2 yes Figure 1 A structural diagram in another state.

[0022] Figure 3 yes Figure 2 A schematic diagram of its decomposed structure.

[0023] Figure 4 yes Figure 1 A sectional view.

[0024] Figure 5 yes Figure 3 A schematic diagram of the specific structure of the upper shell.

[0025] Figure 6 yes Figure 5 A schematic diagram of the paper limiting mechanism in the paper.

[0026] Figure 7 yes Figure 5A schematic diagram of the structure after removing the paper limiting mechanism.

[0027] Figure 8 yes Figure 5 A structural diagram from another perspective.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Lower housing; 11. Lower housing body; 111. Battery slot; 1111. First slot plate; 1112. Second slot plate; 1113. Third slot plate; 12. Battery cover;

[0030] 2. Upper shell; 21. Upper shell body; 211. Paper tray; 212. Slide groove; 213. Fixing hole; 214. Fixing slot; 22. Flip cover; 23. Paper outlet;

[0031] 3. NFC coil; 31. Connecting part; 311. First connecting strip; 312. Second connecting strip; 313. Third connecting strip; 32. Main body;

[0032] 4. Circuit board;

[0033] 5. Battery;

[0034] 6. Paper limiting mechanism; 61. First baffle; 62. Second baffle; 63. First rack; 64. Second rack; 65. Transmission component; 66. Fixing component; 661. Fixing block; 67. Paper limiting space;

[0035] 7. Printing roller;

[0036] 8. Interactive module; 81. Support frame; 811. Mounting hole; 812. Support plate; 82. Button; 821. Button body; 822. Force-applying column; 83. Display screen;

[0037] D1, first direction; D2, second direction. Detailed Implementation

[0038] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0039] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0040] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0041] Please see Figures 1 to 4 The printer with NFC function provided in one embodiment of this utility model mainly includes a lower housing 1, an upper housing 2, an NFC coil 3, and a circuit board 4. The upper housing 2 is located above the lower housing 1 and is detachably connected to the lower housing 1. The upper housing 2 has a paper tray 211 and a paper outlet 23, which communicates with both the paper tray 211 and the outside. The NFC coil 3 is located inside the lower housing 1 and is pressed against the bottom surface of the lower housing 1 by the upper housing 2, and is located directly below the paper tray 211. The circuit board 4 is installed inside the lower housing 1 and is arranged side by side with the paper tray 211 in the horizontal direction, and is electrically connected to the NFC coil 3.

[0042] In the NFC-enabled printer of this embodiment, the paper tray 211 stores printing paper. When an NFC-enabled device approaches the printer, the NFC coil 3, pressed against the bottom surface of the lower housing 1, wirelessly communicates with the device to obtain printing information. Subsequently, the circuit board 4 outputs a printing command, the printing paper in the paper tray 211 is conveyed outward and printed, and the printed paper is sent out from the paper output port 23. Since the NFC coil 3 is located directly below the paper tray 211, and the circuit board 4 and the paper tray 211 are arranged side by side in the horizontal direction, the related structure forming the paper tray 211 in the upper housing 2 acts as a barrier between the circuit board 4 and the NFC coil 3, effectively reducing the signal attenuation phenomenon caused by interference from the circuit board 4 to the NFC coil 3, thereby improving the wireless communication effect. On the other hand, since the upper housing 2 and the lower housing 1 are detachably connected, and the NFC coil 3 is pressed against the bottom surface of the lower housing 1 by the upper housing 2, the lower housing 1 and the upper housing 2 can effectively seal the NFC coil 3, thereby reducing the interference of the NFC coil 3 from the external environment, and further improving the wireless communication effect.

[0043] In a specific embodiment, the lower housing 1 includes a lower housing body 11 and a battery cover 12. The lower housing body 11 has a battery slot 111 inside, which houses a battery 5. The bottom surface of the lower housing body 11 has a slot communicating with the battery slot 111. The battery cover 12 is used to close or open the slot. A circuit board 4 is located directly above the battery slot 111 and is electrically connected to the battery 5. The battery 5 provides power to the printer as a whole. While there is a height difference between the circuit board 4 and the NFC coil 3, the arrangement of the battery slot 111 and the battery 5 allows for efficient use of the printer's internal space, achieving a compact overall structure. The slot being located on the bottom surface of the lower housing body 11 facilitates the installation and removal of the battery 5.

[0044] It is conceivable that the NFC coil 3 is pressed tightly against the bottom surface of the lower shell 11 by the upper shell 2.

[0045] In a specific embodiment, the NFC coil 3 includes a connecting part 31 and a main body 32. The connecting part 31 has a stepped structure and includes a first connecting strip 311, a second connecting strip 312, and a third connecting strip 313. The first connecting strip 311 and the second connecting strip 312 both extend horizontally and are arranged in opposite directions and staggered. The third connecting strip 313 extends vertically. The two ends of the first connecting strip 311 are connected to the circuit board 4 and the upper end of the third connecting strip 313, respectively. The two ends of the second connecting strip 312 are connected to the main body 32 and the lower end of the third connecting strip 313, respectively. The main body 32 is pressed against the bottom surface of the lower housing 1 by the upper housing 2 and is located directly below the paper tray 211. The main body 32 of the NFC coil 3 is used to perform wireless communication functions, and the connecting part 31 is used to connect the main body 32 and the circuit board 4. The stepped arrangement of the connecting part 31 can adapt to the height difference between the circuit board 4 and the main body 32, forming a stable and effective connection between the two, and enhancing the complexity and length of the signal transmission path, while reducing the impact of electromagnetic interference on the NFC signal.

[0046] Please see Figure 4 In a specific embodiment, the battery slot 111 includes a first slot plate 1111, a second slot plate 1112, and a third slot plate 1113. The first slot plate 1111 and the second slot plate 1112 both extend vertically and are arranged side by side in the horizontal direction. The third slot plate 1113 extends horizontally and is connected to the first slot plate 1111 and the second slot plate 1112 respectively. The first connecting strip 311 is located vertically between the circuit board 4 and the third slot plate 1113 and is connected to the bottom of the circuit board 4. The third connecting strip 313 is arranged side by side with the second slot plate 1112 in the horizontal direction.

[0047] The frame structure of the battery slot 111 and the stepped design of the NFC coil 3 connection part 31 complement each other, so that the NFC coil 3 connection part 31 can be cleverly integrated into the space around the battery slot 111, avoiding mutual interference between components, realizing efficient use of the internal space of the printer, and improving the overall coordination and maintainability of the internal structure of the printer.

[0048] In a further embodiment, the first connecting strip 311 can be attached to the third slot plate 1113, and the third connecting strip 313 can be attached to the second slot plate 1112, which can effectively prevent the position of the NFC coil 3 from shifting, thereby improving the stability and reliability of the overall structure.

[0049] Please see Figures 5 to 7 In a specific embodiment, the printer with NFC function also includes a paper limiting mechanism 6. The paper limiting mechanism 6 includes a first baffle 61, a second baffle 62, a first rack 63, a second rack 64, and a transmission member 65. The first baffle 61 and the second baffle 62 are both located in the paper tray 211, and a paper limiting space 67 is formed between them. The first rack 63 and the second rack 64 are respectively connected to the first baffle 61 and the second baffle 62. The transmission member 65 has gear teeth, which mesh with the first rack 63 and the second rack 64 respectively. The transmission member 65 is rotatably connected to the upper housing 2. The transmission member 65 rotates relative to the upper housing 2 to drive the first rack 63 and the second rack 64 to move horizontally, and to make the first baffle 61 and the second baffle 62 move closer to each other or further away from each other, so as to increase or decrease the paper limiting space 67. The paper limiting mechanism 6 is designed to allow the printer to easily adapt to different paper sizes. Specifically, by rotating the transmission component 65 in both directions, the first rack 63, the first baffle 61 connected to the first rack 63, the second rack 64, and the second baffle 62 connected to the second rack 64 are connected, thereby adjusting the size of the paper limiting space 67. This makes the operation quick and convenient, and the adjustment accuracy is high.

[0050] In a specific embodiment, the paper tray 211 has two grooves 212 extending along the first direction D1, and the two grooves 212 are respectively located on both sides of the transmission member 65 in the first direction D1. The first rack 63 and the second rack 64 extend along the first direction D1 and are respectively located on both sides of the transmission member 65 in the second direction D2, and the second direction D2 is perpendicular to the first direction D1. The transmission member 65, the first rack 63 and the second rack 64 are all located outside the paper tray 211, and the first baffle 61 and the second baffle 62 pass through the two grooves 212 to connect with the first rack 63 and the second rack 64 respectively.

[0051] A reasonable and feasible layout is provided for the paper limiting mechanism 6. Specifically, when the transmission member 65 rotates, the first rack 63 and the second rack 64 move towards each other or away from each other in the first direction D1, which will drive the first baffle 61 and the second baffle 62 to slide in the two slide grooves 212 respectively. The two slide grooves 212 provide a clear path for the movement of the first baffle 61 and the second baffle 62, thereby ensuring that the paper limiting mechanism 6 has the accuracy and stability of adjustment.

[0052] In a specific embodiment, the paper limiting mechanism 6 further includes a fixing member 66, and the upper housing 2 is provided with a fixing hole 213 and a fixing groove 214. The transmission member 65 is a damper, and the transmission member 65 includes a fixing part and a rotating part rotatably connected to the fixing part. The fixing member 66 is a bolt, which passes through the fixing part and is locked in the fixing hole 213, and the rotating part is rotatably connected to the upper housing 2. Alternatively, the transmission member 65 is a gear, and the fixing member 66 is a bracket. The fixing member 66 is located on the side of the transmission member 65 away from the upper housing 2, and is provided with a fixing block 661 extending towards the side of the upper housing 2. The fixing block 661 engages with the fixing groove 214, and the transmission member 65 is rotatably connected to the bracket.

[0053] When a damper is selected for transmission component 65, it features high adjustment precision and smooth rotation. When a gear is selected for transmission component 65, it features high transmission efficiency and good transmission reliability. Specifically, users can select dampers and gears as transmission components 65 according to actual usage conditions, and install them through the cooperation between the fixing component 66 and the fixing hole 213 or between the fixing component 66 and the fixing groove 214, thereby improving the applicability and versatility of the overall structure.

[0054] Please see Figures 2 to 4 In a specific embodiment, the printer with NFC functionality further includes a printing unit, which includes a print head and a printing roller 7. The print head is installed inside the lower housing 1. The upper housing 2 includes an upper housing body 21 and a flip cover 22. The upper housing body 21 is provided with a paper tray 211. The flip cover 22 is provided with a printing roller 7 and is hinged to the upper housing body 21. The flip cover 22 rotates relative to the upper housing body 21 to open or close the paper tray 211. When the flip cover 22 closes the paper tray 211, a paper outlet 23 is formed between the flip cover 22 and the upper housing body 21. The printing roller 7 is arranged opposite to the print head, and a paper feeding channel is formed between the printing roller 7 and the print head, which communicates with the paper tray 211 and the paper outlet 23 respectively.

[0055] When the printer is idle, the flip cover 22 is in the open position, and the paper tray 211 is fully open, making it convenient for the user to put paper into the paper tray 211. After the user puts an appropriate amount of paper of suitable size into the paper tray 211, the flip cover 22 is rotated relative to the upper shell body 21 around the hinge point, so that the flip cover 22 gradually closes the paper tray 211. During the closing process of the flip cover 22, the printing roller 7 installed on the flip cover 22 also moves closer to the print head. When the flip cover 22 completely closes the paper tray 211, the printing roller 7 is positioned opposite the print head, and a paper path is formed between them. The connection between the paper tray 211, the paper path, and the paper outlet 23 creates a complete path for paper transport. The flip cover 22 not only closes the paper tray 211 to protect the paper, but also supports the printing roller 7, making the entire printer structure compact. Rotating the flip cover 22 facilitates subsequent operations such as loading and unloading paper and clearing paper jams, thereby improving operational convenience.

[0056] Please see Figure 1 , Figure 2 , Figure 4 and Figure 8 In a specific embodiment, the printer with NFC functionality further includes an interaction module 8, located directly above the circuit board 4, and comprising a support frame 81, a button 82, and a display screen 83. The support frame 81 is fixed to the side of the upper housing 2 facing the circuit board 4 and has mounting holes 811 and a support plate 812. The button 82 includes a button body 821 and a force-applying column 822. The button body 821 is embedded in the upper housing 2, and the force-applying column 822 passes through the mounting holes 811 and abuts against the key position on the circuit board 4. The display screen 83 is embedded in the upper housing 2, abuts against the support plate 812, and is located directly above the support plate 812.

[0057] The combination of button 82 and display screen 83 enables human-computer interaction between the user and the printer, improving ease of use and user experience. Specifically, the support frame 81 is fixed on the side of the upper housing 2 facing the circuit board 4, providing reliable mounting support for button 82 and display screen 83. The force-applying column 822 of button 82 passes through the mounting hole 811 of support frame 81 and abuts against the key position of circuit board 4, while display screen 83 abuts against support plate 812. This design enables a tight and stable connection between the components, reducing the possibility of loosening or displacement of components, thereby improving the stability of the overall structure.

[0058] In a specific embodiment, waterproof foam is provided between the button body 821 and the side of the upper housing 2 facing the circuit board 4, thereby enhancing the dustproof and waterproof performance.

[0059] It should be noted that the connections in the above embodiments can be fixed connections or detachable connections, and the specific connection methods can be bolt connections or snap-fit ​​connections, etc.

[0060] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A printer with NFC functionality, characterized in that, include: Lower housing; An upper housing is located above the lower housing and is detachably connected to the lower housing. The upper housing contains a paper tray and has a paper outlet, which communicates with both the paper tray and the outside. An NFC coil is disposed inside the lower housing and pressed against the bottom surface of the lower housing by the upper housing, and the NFC coil is located directly below the paper tray; A circuit board is installed inside the lower housing and is arranged side by side with the paper tray in the horizontal direction, and the circuit board is electrically connected to the NFC coil.

2. The printer with NFC function according to claim 1, characterized in that, The lower housing includes a lower housing body and a battery cover. The lower housing body has a battery slot, which contains a battery. The bottom surface of the lower housing body has a slot that communicates with the battery slot. The battery cover is used to close or open the slot. The circuit board is located directly above the battery compartment and is electrically connected to the battery.

3. The printer with NFC function according to claim 2, characterized in that, The NFC coil includes a connecting part and a main body. The connecting part has a stepped structure and includes a first connecting strip, a second connecting strip, and a third connecting strip. The first connecting strip and the second connecting strip both extend along the horizontal direction and extend in opposite directions and are staggered. The third connecting strip extends vertically. The two ends of the first connecting strip are respectively connected to the circuit board and the upper end of the third connecting strip. The two ends of the second connecting strip are respectively connected to the main body and the lower end of the third connecting strip. The main body is pressed against the bottom surface of the lower housing by the upper housing and is located directly below the paper tray.

4. The printer with NFC function according to claim 3, characterized in that, The battery slot includes a first slot plate, a second slot plate, and a third slot plate. The first slot plate and the second slot plate both extend vertically and are arranged side by side in the horizontal direction. The third slot plate extends in the horizontal direction and is connected to the first slot plate and the second slot plate, respectively. The first connecting strip is located vertically between the circuit board and the third slot plate and is connected to the bottom of the circuit board. The third connecting strip and the second slot plate are arranged side by side in the horizontal direction.

5. The printer with NFC function according to claim 1, characterized in that, It also includes a paper limiting mechanism, which comprises a first baffle, a second baffle, a first rack, a second rack, and a transmission component. The first baffle and the second baffle are both located within the paper compartment, forming a paper limiting space between them. The first rack and the second rack are respectively connected to the first baffle and the second baffle. The transmission component has gear teeth, which mesh with the first rack and the second rack respectively. The transmission component is rotatably connected to the upper housing. The transmission component rotates relative to the upper housing to drive the first rack and the second rack to move horizontally, and to move the first baffle and the second baffle closer together or further apart, thereby increasing or decreasing the paper limiting space.

6. The printer with NFC function according to claim 5, characterized in that, The paper tray is provided with two sliding grooves extending along a first direction, and the two sliding grooves are respectively located on both sides of the transmission component in the first direction; The first rack and the second rack extend along the first direction and are respectively located on both sides of the transmission member in the second direction, and the second direction is perpendicular to the first direction. The transmission component, the first rack, and the second rack are all located outside the paper tray. The first baffle and the second baffle pass through the two slides respectively to connect with the first rack and the second rack respectively.

7. The printer with NFC function according to claim 6, characterized in that, The paper limiting mechanism also includes a fixing component, and the upper housing is provided with a fixing hole and a fixing groove; The transmission component is a damper, comprising a fixed part and a rotating part rotatably connected to the fixed part. The fixed part is a bolt, passing through the fixed part and locked in the fixed hole, and the rotating part is rotatably connected to the upper housing. Alternatively, the transmission component is a gear, the fixed part is a bracket, the fixed part is located on the side of the transmission component facing away from the upper housing, and is provided with a fixing block extending towards the side of the upper housing. The fixing block engages with the fixing groove, and the transmission component is rotatably connected to the bracket.

8. The printer with NFC function according to claim 1, characterized in that, It also includes a printing unit, which includes a print head and a printing roller, the print head being installed inside the lower housing; The upper housing includes an upper housing body and a flip cover. The upper housing body is provided with the paper tray. The flip cover is provided with the printing roller and is hinged to the upper housing body. The flip cover rotates relative to the upper housing body to open or close the paper tray. When the flip cover closes the paper tray, the paper outlet is formed between the flip cover and the upper housing body. The printing roller is disposed opposite to the print head, and a paper feeding channel is formed between the printing roller and the print head, which communicates with the paper tray and the paper outlet respectively.

9. The printer with NFC function according to claim 1, characterized in that, It also includes an interactive module, which is located directly above the circuit board and includes a support frame, buttons, and a display screen; The support frame is fixed on the side of the upper housing facing the circuit board and is provided with mounting holes and a support plate; The button includes a button body and a force-applying column. The button body is embedded in the upper housing, and the force-applying column passes through the mounting hole and abuts against the key position on the circuit board. The display screen is embedded in the upper housing, abuts against the support plate, and is located directly above the support plate.

10. The printer with NFC function according to claim 9, characterized in that, Waterproof foam is provided between the button body and the side of the upper housing facing the circuit board.

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