A thermal printer

Abstract

The utility model discloses a thermal printer relates to printer technical field, including the cover and base of relative rotation connection, and the cover opening mechanism, the cover opening mechanism includes the cover opening subassembly of setting respectively in the left and right sides of cover or base, the cover opening subassembly includes press key, rotator and elastic reset piece, the rotation axis of rotator is arranged on the cover or base, one end of rotator is equipped with the shackle of with base or cover movable joint, the other end of rotator is used for with press key push -on cooperation to rotate shackle and realizes the unlocking, and the elastic reset piece is used for to shackle keep joint direction to rotator force. This scheme structure is simpler, and the part is fewer, has reduced manufacturing cost and failure rate, has saved the precious internal space simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, and in particular to a thermal printer. Background Technology

[0002] Thermal printers typically use hooks to hold the printer open on both sides. When printing wide-format paper, the large width makes it difficult to control the hooks on both sides to release in conjunction with a single button. Therefore, Chinese invention patent CN118238536B, published on June 25, 2024, discloses a one-button opening mechanism for printers. This mechanism uses a complex series of levers, torsion springs, compression blocks, latches, and springs to transform a simple linear button press into a precise rotation unlocking and lid pop-up action for opening the printer.

[0003] Although this lid-opening mode only requires one button, its structure is complex, costly, and takes up a lot of space. For thermal printers that need to be miniaturized, the more important issue is not one-button lid opening, but saving internal space in the thermal printer. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a thermal printer to solve the problem of large space occupation of the opening mechanism of current wide-format printers.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A thermal printer includes a cover and a base rotatably connected to each other, and a cover opening mechanism. The cover opening mechanism includes cover opening components respectively disposed on the left and right sides of the cover or the base. Each cover opening component includes a press button, a rotating component, and a resilient reset component. The rotating shaft of the rotating component is disposed on the cover or the base. One end of the rotating component is provided with a hook that is movably engaged with the base or the cover. The other end of the rotating component is used to push and cooperate with the press button to rotate the hook to unlock. The resilient reset component is used to apply force to the rotating component in the direction that the hook is engaged.

[0006] Preferably, the cover has a first base frame, the base has a second base frame, the rotation shaft of the rotating member is disposed on the first base frame, and the hook of the rotating member passes through the first through hole of the second base frame to engage with the side of the second base frame away from the cover.

[0007] Preferably, the second base frame has a snap-fit ​​surface that snaps into the hook, and a rubber roller or a thermal module is mounted on the second base frame, with the snap-fit ​​surface located at both ends of the rubber roller or thermal module extending outwards.

[0008] Preferably, the elastic reset member includes a torsion spring, and the first base frame is provided with a mounting protrusion that is not coaxial with the rotation axis. The fixed end of the torsion spring is sleeved on the mounting protrusion, and the free end of the torsion spring extends to form an abutment portion, which continuously abuts against and acts on the rotating member.

[0009] Preferably, the first base frame has a hinge seat that is rotatably connected to the rotating member, and a rubber roller or a thermal module is mounted on the first base frame. The hinge seat and the mounting protrusion are located at the two ends of the rubber roller or thermal module extending outward.

[0010] Preferably, a paper feeding channel is formed between the first base frame and the second base frame, and the paper feeding channel includes a paper inlet and a paper outlet.

[0011] Preferably, the paper inlet is provided with a paper limiting component for adjusting the paper width, and the paper limiting component is slidably mounted on the first base frame or the second base frame.

[0012] Preferably, the paper limiting assembly is slidably mounted on the second base frame. The paper limiting assembly includes a sliding member and a stop plate. The sliding member slides along the paper width direction on the second base frame, and the stop plate is disposed on the sliding member to move with the sliding member.

[0013] Preferably, one side of the second base frame is provided with a recess, the recess having a groove or rail adapted to the sliding member; the baffle plate includes a vertical baffle plate and a horizontal support plate, the top surface of the horizontal support plate being flush with the paper feed channel surface of the paper inlet on the other side of the second base frame.

[0014] Preferably, the length of the recess is one-third to two-thirds of the width of the paper feed channel, and the width of the horizontal support plate is one-twentieth to one-half of the width of the paper feed channel.

[0015] Compared with the prior art, the beneficial effects that this utility model can achieve are: This invention features independent opening components on both the left and right sides of the cover or base. Each component is an independent lever system, with the pressing button as the force application point, the rotating part as the lever, its pivot as the fulcrum, and the latch as the resistance point. Utilizing the pre-tightening force of the elastic reset component, a torque is consistently applied to the rotating part, tending to keep the latch engaged, ensuring the stability and locking force of the cover closure during printing, and automatically resetting after the unlocking action. Compared to the complex multi-link linkage mechanism in the prior art, this solution has a simpler structure and fewer parts, reducing manufacturing costs and failure rates, while saving valuable internal space. Each independent opening component has minimal parts, eliminating the need for a connecting shaft between the two rotating parts; simply pressing the pressing buttons on both sides of the printer drives the lever to complete the unlocking, resulting in a clear and efficient force transmission path. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the thermally sensitive printer according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the hidden cover shell; Figure 3 for Figure 1 A structural schematic diagram of the concealed cover and the outer shell of the base; Figure 4 for Figure 3 A structural diagram from a second perspective; Figure 5 for Figure 3 A schematic diagram of the structure of the hidden cover components and the thermal module; Figure 6 for Figure 1 A schematic diagram of the structure of the thermal module; Figure 7 for Figure 6 A structural diagram from a second perspective; Figure 8 for Figure 6 A schematic diagram of the mounting plate structure; Figure 9 for Figure 6 A schematic diagram of the substrate structure.

[0017] The components are as follows: 1. Cover body; 11. First base frame; 111. Mounting protrusion; 112. Hinge seat; 2. Base; 21. Second base frame; 211. Snap-fit ​​surface; 212. Recessed part; 213. Fixed paper stop wall; 214. Slide groove; 22. Glue roller; 23. 3. Cover opening assembly; 31. Press button; 32. Rotating component; 321. Hook; 33. Elastic reset component; 331. Fixed end; 332. Abutting part; 4. Paper limiting assembly; 41. Sliding component; 42. Paper stop plate; 421. Vertical paper stop. 422. Horizontal support plate; 5. Paper path; 51. Paper inlet; 52. Paper outlet; 6. Thermal module; 61. Mounting plate; 611. First limiting groove; 612. First through groove; 613. Second through groove; 614. Accommodating groove; 615. Front and rear side walls; 616. Second limiting groove; 617. Positioning post; 62. Base plate; 621. First vertical protrusion; 622. First limiting block; 623. Second vertical protrusion; 624. Second limiting block; 63. Head piece; 64. Spring. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.

[0019] like Figures 1-5 As shown, a thermal printer includes a cover 1 and a base 2 rotatably connected to each other, and a cover opening mechanism, wherein the cover opening mechanism includes cover opening components 3 respectively disposed on the left and right sides of the cover 1 or the base 2.

[0020] Please refer to Figure 2 and Figure 4 The opening assembly 3 includes a pressing button 31, a rotating component 32, and an elastic reset component 33. The rotating shaft of the rotating component 32 is set on the cover body 1. One end of the rotating component 32 is provided with a hook 321 that is movably engaged with the base 2. When the cover is closed, the hook 321 is tightly engaged with the base 2, so that the cover body 1 and the base 2 are firmly fixed together.

[0021] In this embodiment, the other end of the rotating component 32 is used to push and cooperate with the pressing button 31 to rotate the hook 321 to unlock. The pressing button 31 is slidably disposed inside the cover 1, and the end of the pressing button 31 has a push block structure. The other end of the rotating component 32 is provided with a force-bearing crossbar, so that the pressing force of the pressing button 31 can be efficiently converted into a pushing force on the rotating component 32. The elastic reset component 33 is used to apply force to the rotating component 32 to keep the hook 321 in the locking direction, so that the hook 321 can keep the cover closed. This utility model provides independent cover opening components 3 on the left and right sides of the cover 1 or the base 2. Each component is an independent lever system, with the pressing button 31 as the force application point, the rotating component 32 as the lever, its pivot as the fulcrum, and the hook 321 as the resistance point. By utilizing the pre-tightening force of the elastic reset component 33, a torque is consistently applied to the rotating component 32, tending to keep the latch 321 engaged. This ensures the stability and locking force of the cover 1 during printing and allows for automatic reset after the unlocking action is completed. Compared to the complex multi-link linkage mechanism in the prior art, this solution has a simpler structure and fewer parts, reducing manufacturing costs and failure rates while saving valuable internal space. Each independent cover opening component 3 has minimal parts, eliminating the need for connecting shafts between the two rotating components 32. Simply pressing the buttons 31 on both sides of the printer drives the lever to complete the unlocking process, resulting in a clear and efficient force transmission path.

[0022] In another embodiment, the rotating shaft of the rotating component 32 is disposed on the base 2, and one end of the rotating component 32 is provided with a hook 321 that is movably engaged with the cover 1. The pressing button 31 is slidably disposed on the base 2, and both can complete the function of opening and unlocking the cover.

[0023] Please refer to Figures 2 to 4 The cover 1 has a first base frame 11, and the base 2 has a second base frame 21. The rotation shaft of the rotating member 32 is disposed on the first base frame 11, and the hook 321 of the rotating member 32 passes through the first through hole of the second base frame 21 to engage with the side of the second base frame 21 away from the cover 1. The second base frame 21 has an engagement surface 211 that engages with the hook 321. Utilizing the robust first base frame 11 and second base frame 21 as a load-bearing and mounting foundation avoids applying stress to the easily deformable outer shell, improving the rigidity and durability of the entire opening mechanism. The first through hole guides and limits the movement of the hook 321, ensuring the accuracy of the engagement and unlocking positions.

[0024] Specifically, the diameter of the first through hole is larger than that of the hook 321 of the rotating member 32, so the hook 321 can enter or exit. The bottom of the hook 321 is provided with a guide slope. When the cover is closed, the hook 321 contacts the side wall of the first through hole through the guide slope. When the hook 321 has completely passed through the first through hole, the hook 321 will be locked onto the locking surface 211 by the reset torque of the elastic reset member 33. When it is necessary to open the cover, the press buttons 31 on both sides of the printer are pressed simultaneously to drive the rotating member 32 to rotate, thereby compressing the elastic reset member 33. The hook 321 rotates away from the locking surface 211 and further disengages from the first through hole.

[0025] Please refer to Figure 2 and Figure 4 The second base frame 21 is equipped with a rubber roller 22 or a thermal module 6, and the snap-fit ​​surface 211 is located at both ends of the rubber roller 22 extending outwards. Positioning the snap-fit ​​surface 211 near the location where the rubber roller 22 is installed ensures good contact pressure between the rubber roller 22 and the thermal module 6, effectively preventing uneven printing pressure caused by base frame deformation, thus ensuring print clarity and avoiding unclear striped printing.

[0026] The elastic reset element 33 can be a tension spring, a compression spring, or other elastic element.

[0027] Please refer to Figure 2In this embodiment, the elastic reset member 33 includes a torsion spring. The first base frame 11 is provided with a mounting protrusion 111 that is not coaxial with the rotation axis. The fixed end 331 of the torsion spring is sleeved on the mounting protrusion 111, and the free end 332 of the torsion spring extends to form an abutment portion, which continuously abuts against and acts on the rotating member 32. The fixed end 331 of the torsion spring is sleeved on the mounting protrusion 111 that is not coaxial with the rotation axis. This eccentric design ensures that the torsion spring is in a pre-tightened state after installation, and can immediately generate the required reset torque. The free end 332 of the torsion spring always abuts against the rotating member 32, providing uninterrupted reset force. The torsion spring is a very space-saving elastic element, and the eccentric installation method ensures that the reset force is always present and stable, without the need for other complex structures.

[0028] Please refer to Figure 2 The first base frame 11 has a hinge seat 112 rotatably connected to the rotating member 32. A thermal module 6 is mounted on the first base frame 11. The hinge seat 112 and the mounting protrusion 111 are located at the outward extension positions at both ends of the rubber roller 22 or the thermal module 6. The hinge seat 112 and the mounting protrusion 111 of the cover opening mechanism are also located in the extension areas at both ends of the thermal module 6, so as to correspond to the position of the snap-fit ​​surface 211. Together, they ensure good contact pressure between the rubber roller 22 and the thermal module 6, effectively prevent uneven printing pressure caused by base frame deformation, thereby ensuring printing clarity and avoiding the problem of unclear strip printing.

[0029] In other embodiments, a rubber roller 22 may be installed on the cover 1 and a thermal component may be installed on the base 2; this is not a limitation.

[0030] Please refer to Figure 1 and Figure 5 A paper feeding channel 5 is formed between the first base frame 11 and the second base frame 21, the paper feeding channel 5 including a paper inlet 51 and a paper outlet 52. The paper inlet 51 is provided with a paper limiting component 4 for adjusting the paper width, the paper limiting component 4 being slidably mounted on the first base frame 11 or the second base frame 21. Through the slidably mounted paper limiting component 4, the user can flexibly adjust the effective width of the channel according to the width of the printing paper. This allows the printer to adapt to various sizes of thermal paper, expanding the product's application range and preventing problems such as paper jams and tilted printed content caused by skewed paper feeding.

[0031] Please refer to Figure 4 and Figure 5The paper limiting assembly 4 is slidably mounted on the second base frame 21. The paper limiting assembly 4 includes a slider 41 and a guide plate 42. The slider 41 slides along the paper width direction on the second base frame 21, and the guide plate 42 is disposed on the slider 41 to move with it. The paper limiting assembly 4 can be decomposed into the slider 41, which performs the sliding function, and the guide plate 42, which performs the limiting function, and the two are integrated together. The slider 41 is responsible for movement and positioning, and the guide plate 42 is responsible for guiding the paper. The user can adjust the position of the guide plate by applying force to either the slider 41 or the guide plate 42.

[0032] For further details, please refer to... Figure 5 The second base frame 21 has a recess 212 on one side, and the recess 212 has a groove 214 adapted to the slider 41. The groove 214 is designed to face the paper width direction, and the design of the groove 214 ensures the linearity and stability of the slider 41's movement. In other embodiments, it can also be a slide rail. In this embodiment, the slider 41 and the groove 214 can be a frictional fit with resistance, so when the external force stops at any position, the frictional force of the slider 41 and the groove 214 itself can keep them in place. In other embodiments, the slider 41 and the groove 214 can also be engaged and positioned by a slender rack and pinion structure.

[0033] The baffle plate 42 includes a vertical baffle plate 421 and a horizontal support plate 422. The top surface of the horizontal support plate 422 is flush with the surface of the paper feeding channel 5 on the other side of the paper inlet 51 on the second base frame 21. The flush surface of the horizontal support plate 422 with the surface of the paper feeding channel 5 provides a stepless and unobstructed transition plane for the paper.

[0034] The pre-designed recess 212 and the horizontal support plate 422 of the paperboard 42 itself eliminate the height difference, which can prevent the paper from curling or getting stuck when it enters due to the front end hitting the step, greatly improving the reliability of paper feeding.

[0035] Preferably, the length of the recess 212 is one-third to two-thirds of the width of the paper path 5, and the width of the horizontal support plate 422 is one-twentieth to one-half of the width of the paper path 5. Thus, the length of the recess 212 ensures sufficient guiding stroke and structural strength; the width of the horizontal support plate 422 balances the paper guiding effect with material cost / space occupation.

[0036] Please refer to Figures 6 to 9The thermal module 6 used in this embodiment has the characteristic of quick assembly and disassembly, and includes a mounting plate 61, a base plate 62, a head piece 63, and a spring 64. The head piece 63 is disposed on the base plate 62, and the spring 64 is located between the mounting plate 61 and the base plate 62. The base plate 62 is provided with a plurality of first vertical protrusions 621 extending toward the mounting plate 61, and the ends of the first vertical protrusions 621 are provided with first limiting blocks 622 extending in the left and right directions.

[0037] The mounting plate 61 is provided with a plurality of first limiting grooves 611 corresponding to the first vertical protrusion 621. The first limiting groove 611 includes a first through groove 612 and a second through groove 613 that are connected front and back. The width of the first through groove 612 is greater than the width of the first limiting block 622, and the width of the second through groove 613 is less than the width of the first limiting block 622 and greater than or equal to the width of the first vertical protrusion 621.

[0038] The first vertical protrusion 621, the first limiting block 622, and the first through slot 612 and the second through slot 613 cooperate to form a mechanical structure similar to a T-slot. During assembly, the first limiting block 622 is vertically inserted into the wide first through slot 612 and then slides forward or backward, allowing the first vertical protrusion 621 to enter the narrow second through slot 613. The sidewall of the second through slot 613 blocks the first limiting block 622, thus achieving vertical positioning. The width of the second through slot 613 is precisely designed to be slightly larger than the width of the first vertical protrusion 621, ensuring smooth sliding while effectively limiting lateral swaying, achieving positioning in the horizontal and paper width directions. Its operation is simple. Assembly can be completed by aligning the substrate 62, inserting it into the corresponding slot of the mounting plate 61, and sliding it. Disassembly can be completed by reversing the operation. After sliding and locking, the elastic force of the spring 64 will force the substrate 62 to stick tightly to the mounting plate 61, while the first limiting block 622 will press tightly against the side wall of the second through slot 613 to form a self-locking mechanism, preventing accidental slippage and ensuring a firm connection.

[0039] It completely eliminates the need for additional base frames and pin connectors, and only utilizes the structure of the mounting plate 61 and the base plate 62 themselves to achieve the connection. It has the fewest parts and the lowest cost. The spring 64 located between the mounting plate 61 and the base plate 62 can provide a stabilizing force to maintain the relative position of the mounting plate 61 and the base plate 62.

[0040] Please refer to Figure 8 and Figure 9The first vertical protrusion 621 and the first limiting block 622 form a T-shaped protrusion structure in the vertical direction of the substrate 62, and the first through groove 612 and the second through groove 613 form a T-shaped through groove structure in the horizontal direction of the mounting plate 61. The T-shaped structure can withstand greater bending moment and shear force mechanically, and is more stable than simple protrusions and grooves. During sliding, the mating surface between the T-shaped protrusion and the T-shaped groove is larger, the guidance is more precise, and the assembly feel is smoother.

[0041] Preferably, the width of the second through groove 613 is 0.01mm to 0.1mm wider than the width of the first vertical protrusion 621. This controls the single-sided gap between the second through groove 613 and the first vertical protrusion 621 to a very small range of 0.005mm to 0.05mm. The extremely small gap ensures that there is almost no play between the substrate 62 and the mounting plate 61 on the horizontal plane, resulting in high connection rigidity and ensuring the accuracy of the relative position of the head plate 63 and the roller 22, thereby improving printing quality. Although the gap is small, necessary assembly tolerances are still allowed to ensure that the sliding assembly can still proceed smoothly even under slight processing errors or thermal expansion and contraction.

[0042] Please refer to Figure 6 and Figure 8 The mounting plate 61 is provided with a receiving groove 614 for mounting the spring 64, and the front and rear sidewalls 615 of the receiving groove 614 extend toward the substrate 62. The first limiting groove 611 is located at the top of the front and rear sidewalls 615 of the receiving groove 614. Thus, the sidewalls of the receiving groove 614 serve two purposes: they surround the spring 64 to prevent it from shifting, and they also form part of the limiting mechanism. The structure is very compact, and the extended sidewalls act as reinforcing ribs, significantly improving the mounting plate 61's resistance to bending deformation when subjected to the pressure of the spring 64 and the printing pressure.

[0043] For further details, please refer to... Figures 7 to 9 Multiple first limiting grooves 611 are disposed on one side of the front and rear sides of the mounting plate 61; a second limiting groove 616 is provided on the other side of the mounting plate 61, and a corresponding second vertical protrusion 623 is provided on the substrate 62, and the second vertical protrusion 623 is provided with a second limiting block 624 extending in the forward and backward direction. The second vertical protrusion 623 and the second limiting block 624 form an L-shaped structure, and different forms of limiting structures are used on the front and rear sides of the mounting plate 61, one side is a T-shaped groove, and the other side is a normal open groove. This asymmetrical design ensures that the module has only one correct assembly direction and position.

[0044] The second limiting block 624 extends away from the first limiting block 622; the second through groove 613 is located on the side away from the second limiting groove 616. The extending directions of the two limiting blocks are opposite, and the narrow section of the T-groove is located on the side away from the other limiting groove. In this way, the elastic force of the spring 64 will simultaneously pull both limiting blocks towards the dead point or pressing surface of their respective limiting grooves.

[0045] During installation, the L-shaped structure formed by the second vertical protrusion 623 and the second limiting block 624 of the substrate 62 in this embodiment is first embedded into the second limiting groove 616 and moves away from the first limiting groove 611. Then, the T-shaped structure formed by the first vertical protrusion 621 and the first limiting block 622 is embedded into the first through groove 612. Then, the substrate 62 moves away from the second limiting groove 616, so that the first vertical protrusion 621 is inserted into the second through groove 613. Thus, the first vertical protrusion 621 and the second through groove 613 form a limit in the paper width, i.e., the left and right direction, and the first limiting block 622 and the second through groove 613 form a limit in the vertical direction.

[0046] Preferably, the receiving groove 614 is provided with a plurality of positioning posts 617, and the spring 64 is sleeved and installed on the positioning posts 617. The positioning posts 617 are used to radially limit and guide the inner diameter of the spring 64, ensuring that the spring 64 is vertically compressed, so that its elastic force is evenly applied to the substrate 62, thereby ensuring uniform pressure on the printing head 63 and consistent printing effect.

[0047] In this embodiment, there are at least three first vertical protrusions 621 and first limiting grooves 611, employing at least three or more connection points, which conforms to the basic mechanical design principle that three points determine a plane. In other preferred embodiments, T-slots and T-protrusions can be installed on both the front and rear sides of the mounting plate 61 for mutual limiting cooperation, wherein at least one set of limiting structures composed of the first vertical protrusions 621 and the first limiting grooves 611 is provided on one side, and at least two sets are required on the other side; furthermore, at least three sets of limiting structures are provided on both the front and rear sides.

[0048] Please refer to Figures 6 to 9 In this embodiment, there are at least three first vertical protrusions 621 and first limiting grooves 611 located on one side of the mounting plate 61 to ensure the stability of the connection.

[0049] In other embodiments, the mounting plate 61 of the quick-release thermal module 6 is provided with a plurality of third vertical protrusions extending toward the substrate 62. The end of each third vertical protrusion is provided with a third limiting block extending in the left and right direction. The substrate 62 is provided with a plurality of third limiting grooves corresponding to the third vertical protrusions. Each third limiting groove includes a third through groove and a fourth through groove that are connected front and back. The width of the third through groove is greater than the width of the third limiting block. The width of the fourth through groove is less than the width of the third limiting block and is greater than or equal to the width of the third vertical protrusion. This is not limited here.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermal printer comprising a cover and a base which are connected in rotation, and an opening mechanism, characterized in that: The opening mechanism includes opening components respectively disposed on the left and right sides of the cover or the base; the opening components include a pressing button, a rotating component, and an elastic reset component. The rotating shaft of the rotating component is disposed on the cover or the base. One end of the rotating component is provided with a hook that is movably engaged with the base or the cover. The other end of the rotating component is used to push and cooperate with the pressing button to rotate the hook to unlock. The elastic reset component is used to apply force to the rotating component in the direction of maintaining engagement with the hook.

2. The thermal printer according to claim 1, characterized in that: The cover has a first base frame, the base has a second base frame, the rotating shaft of the rotating member is disposed on the first base frame, and the hook of the rotating member passes through the first through hole of the second base frame to engage with the side of the second base frame away from the cover.

3. The thermal printer according to claim 2, characterized in that: The second base frame has a snap-fit ​​surface that snaps into the hook. A rubber roller or a thermal module is mounted on the second base frame. The snap-fit ​​surface is located at the two ends of the rubber roller or thermal module extending outward.

4. The thermal printer according to claim 2, characterized by: The elastic reset component includes a torsion spring. The first base frame is provided with a mounting protrusion that is not coaxial with the rotating shaft. The fixed end of the torsion spring is sleeved on the mounting protrusion, and the free end of the torsion spring extends to form an abutment portion. The abutment portion continuously abuts against and acts on the rotating component.

5. The thermal printer according to claim 4, characterized by: The first base frame has a hinge seat that is rotatably connected to the rotating member. A rubber roller or a thermal module is mounted on the first base frame. The hinge seat and the mounting protrusion are located at the two ends of the rubber roller or thermal module extending outward.

6. The thermal printer according to claim 2, characterized by: A paper feeding channel is formed between the first base frame and the second base frame, and the paper feeding channel includes a paper inlet and a paper outlet.

7. The thermal printer according to claim 6, characterized by: The paper inlet is equipped with a paper limiting component for adjusting the paper width, and the paper limiting component is slidably mounted on the first base frame or the second base frame.

8. The thermal printer according to claim 7, characterized by: The paper limiting assembly is slidably mounted on the second base frame. The paper limiting assembly includes a sliding member and a stop plate. The sliding member slides along the paper width direction on the second base frame, and the stop plate is disposed on the sliding member to move with the sliding member.

9. The thermal printer according to claim 8, characterized by: The second base frame has a recessed portion on one side, and the recessed portion has a groove or rail that is adapted to the sliding member; the baffle plate includes a vertical baffle plate and a horizontal support plate, and the top surface of the horizontal support plate is flush with the paper feeding channel surface of the paper inlet on the other side of the second base frame.

10. The thermal printer according to claim 9, characterized by: The length of the recess is one-third to two-thirds of the width of the paper feed channel, and the width of the horizontal support plate is one-twentieth to one-half of the width of the paper feed channel.

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