Thermal printer with cutter module convenient to assemble and disassemble

Abstract

The invention provides a thermal printer with a cutter module convenient to assemble and disassemble, which comprises a base, a flip cover, a rubber roller, a thermosensitive sheet and a cutter module, and is characterized in that the base is provided with a base fixing frame, and the base fixing frame is provided with a fixed connecting plate and two fixed side walls; the fixed knife assembly is in clearance fit with a fixed mounting groove preset in the base fixing frame through a fixed knife connecting plate of the fixed knife assembly, the fixed knife assembly can be installed in the paper width direction in a sliding mode, the fixed knife connecting plate is installed in the fixed mounting groove in a clearance fit mode in the height direction so as to achieve preliminary guiding and positioning, and then preliminary fixing is achieved through clamping of a buckle and a bayonet. By means of the design, the fixed cutter assembly can be installed without screws, basic positioning and connection can be completed only by pushing and aligning, operation steps are greatly simplified, the assembling and disassembling efficiency is improved, and rapid and tool-free assembling and disassembling of the cutter module are achieved.

Description

Technical Field

[0001] This invention relates to the field of thermal printers, and more particularly to a thermal printer with a convenient detachable cutter module. Background Technology

[0002] Thermal printers, a common type of printing device, work by using a thermal printhead to locally heat thermal paper, causing the paper to change color and thus forming text or images. After printing, the paper is usually cut with a cutter for the user to remove.

[0003] In traditional thermal printers, the cutter section, consisting of a moving blade and a fixed blade, is typically fixedly mounted or connected to the printer body via multiple screws. This mounting method has several drawbacks. First, when the cutter wears out, is damaged, or requires cleaning or maintenance, the disassembly and reassembly process is cumbersome, often requiring tools and disassembling multiple parts, resulting in low efficiency and demanding a high level of technical skill from users or maintenance personnel. Second, during assembly and production, the positioning and fixing of the cutter are complex, impacting production efficiency. Third, after prolonged use, the screws may loosen, affecting the stability of the cutter and cutting accuracy.

[0004] Therefore, a thermal printer design is needed that simplifies the installation structure of the cutter module and facilitates quick assembly, disassembly, and maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide a thermal printer with a convenient assembly and disassembly of the cutter module.

[0006] To achieve the objective of this invention, a thermal printer with a convenient detachable cutter module is provided, comprising a base, a flip cover, a rubber roller, a thermal sheet, and a cutter module. One of the rubber roller and the thermal sheet is disposed on the base, and the other is disposed on the flip cover. The flip cover is connected to the base, forming a paper output port between the flip cover and the base. The thermal sheet and the rubber roller face each other and form a paper feeding channel, which communicates with the paper output port. The base is provided with a base fixing frame, which includes a fixing connecting plate and two fixing sidewalls. The fixing connecting plate extends along the paper width direction, and the fixing sidewalls extend along the height direction. The two fixing sidewalls are located on opposite sides of the paper width direction, and the fixing connecting plate is connected between the two fixing sidewalls. The fixing connecting plate has a locking slot, and each fixing sidewall has a fixing mounting groove along the height direction. An inlet is provided at the top in the height direction; the cutter module includes a moving blade assembly and a fixed blade assembly. The fixed blade assembly includes a fixed blade blade and a fixed blade bracket. The fixed blade bracket is provided with a fixed blade connecting plate, which extends along the paper width direction and is fixedly connected to the base. The fixed blade blade is fixedly connected to the fixed blade bracket along the paper width direction and is located below the paper outlet. The moving blade assembly is provided on the flip cover. The moving blade assembly includes a moving blade blade and a moving blade drive device. The moving blade blade is located above the paper outlet, and the moving blade drive device is connected to the moving blade blade and drives the moving blade blade to move toward the fixed blade blade. The fixed blade connecting plate is provided with a buckle at the bottom in the height direction. The fixed blade connecting plate is installed in two fixed mounting slots with clearance fit along the height direction. The fixed blade connecting plate can slide along the paper width direction in the fixed mounting slots, and the buckle can be detachably engaged with the latch.

[0007] A further proposed solution is to provide positioning sidewalls for the fixed blade support, with each positioning sidewall located on one side of the paper width direction. The positioning sidewalls are perpendicularly connected to the fixed blade connecting plate, and the fixed sidewalls on the same side are located on the outer side of the paper width direction. The positioning sidewalls are adjacent to the fixed sidewalls.

[0008] A further improvement is that the base has a locking groove on the outer side of the fixed sidewall in the paper width direction, and the thermal printer also includes a locking rod, which is movably disposed in the locking groove and can be moved to the outer side of the positioning sidewall in the paper width direction and adjacent to the positioning sidewall.

[0009] A further proposed solution is that the lock groove is provided with a first hinge part, the lock rod is provided with a second hinge part and an operating part, the first hinge part is hinged to the second hinge part, the operating part is located on the upper surface of the base, the operating part rotates around the second hinge part, and the operating part moves to a position adjacent to the positioning side wall.

[0010] A further proposed solution is that the first hinge part is arranged as a hinge hole, the second hinge part is arranged as a hinge post, and the outer edge of the hinge post is provided with a guide slope, which slides in conjunction with the groove wall of the locking groove.

[0011] A further proposed solution is to have two positioning sidewalls on the fixed blade support, with the two positioning sidewalls located on opposite sides of the paper width direction. The fixed blade connecting plate is connected between the two positioning sidewalls, and the two positioning sidewalls are located on the same side of the fixed sidewall based on the outer side of the paper width direction.

[0012] A further improvement is that the fixed connecting plate is provided with at least two latches, which are arranged along the paper width direction, and the fixed blade connecting plate is provided with at least two buckles below the height direction, which are arranged along the paper width direction.

[0013] A further alternative is that the fixed blade assembly also includes a fixed blade cover plate, which is installed above the fixed blade connecting plate and located inside the fixed blade based on the paper feed channel.

[0014] A further proposed solution is to provide an clearance mounting groove above the fixed blade connecting plate, with a mounting surface at the upper edge of the clearance mounting groove, and the fixed blade cover plate is fixedly mounted on the mounting surface.

[0015] A further proposed solution involves a flip cover housing a flip cover fixing bracket and locking hooks. The flip cover fixing bracket includes a top connecting plate and two mounting sidewalls. The top connecting plate extends along the paper width direction, and the mounting sidewalls extend along the height direction. The two mounting sidewalls are located on opposite sides of the paper width direction, and the top connecting plate connects between the two mounting sidewalls, forming a top mounting cavity. The top mounting cavity has an insertion port at the bottom in the height direction, and each mounting sidewall has a first positioning groove along the height direction. The two locking hooks are located on opposite sides of the paper width direction, and each locking hook connects to the mounting hook on the same side. The sidewall is hinged, and the locking hook is provided with a hook and a lever. Under the force of the lever, the hook can move to the first positioning slide groove. The cutter module includes a moving blade assembly and a fixed blade assembly. The fixed blade assembly includes a fixed blade, which is set on the base and located below the paper outlet. The moving blade assembly includes a moving blade housing, and the moving blade and moving blade drive device are set in the moving blade housing. The moving blade housing is provided with locking pins on the side walls of the housing on both sides in the paper width direction. The moving blade housing is installed into the top mounting cavity from the insertion port. The locking pins are located in the first positioning slide groove and are in clearance fit with the first positioning slide groove. The hook on one side engages with the locking pin on the same side.

[0016] The beneficial effects of this invention are that, through the gap fit between the fixed blade assembly and the pre-set fixing groove on the base fixing frame, the fixed blade assembly can be slidably installed along the paper width direction, and the fixed blade connecting plate is installed in the fixing groove along the height direction to achieve initial guidance and positioning. Then, the engagement of the buckle and the latch achieves initial fixation. This design makes the installation of the fixed blade assembly without screws. It only requires pushing in and aligning to complete the basic positioning and connection, which greatly simplifies the operation steps, improves the assembly and disassembly efficiency, and also realizes the quick and tool-free assembly and disassembly of the cutting module.

[0017] In addition, based on the initial engagement, the positioning sidewall located outside the fixed sidewall and the locking rod are used to achieve secondary locking of the fixed blade assembly in the paper width direction. The locking rod can be easily operated through the hinge structure and moved to a position adjacent to the positioning sidewall. This effectively prevents the fixed blade assembly from being accidentally displaced due to vibration or force during use, ensuring the stability and accuracy of the cutting process, and providing stable and reliable dual positioning and locking.

[0018] Furthermore, it improves the convenience of production assembly and maintenance: the modular design allows the cutter assembly to be quickly replaced or maintained as a whole or an independent unit, reducing the assembly difficulty and time cost of the production line, while also facilitating on-site maintenance by end users or maintenance personnel and reducing equipment downtime.

[0019] Furthermore, the design of the fixed mounting slots and the bayonet and buckle, as well as the insertion and snapping method of the moving blade housing and the flip cover fixing frame, allow for a certain gap and adjustment space, which facilitates tolerance, improves the adaptability of the parts, ensures the assembly consistency in different batches of production, and enhances the adaptability and flexibility of the structure.

[0020] Furthermore, the moving blade assembly is integrated into the top mounting cavity of the flip cover and fixed by the cooperation of the locking pin and the first positioning slide groove, as well as the engagement of the locking hook and the locking pin. This design makes the installation and removal of the moving blade assembly equally convenient, and the overall structure is compact and does not take up extra space. The fixed blade cover further protects the internal structure and guides the paper.

[0021] In summary, this invention, through its ingenious modular design and locking mechanism, effectively solves the problems of inconvenient assembly and disassembly and difficult maintenance of the cutter part in traditional thermal printers. While ensuring stable and reliable cutting function, it significantly improves the maintainability, assembly efficiency and user experience of the equipment. Attached Figure Description

[0022] Figure 1 This is a structural diagram of an embodiment of the thermal printer of the present invention.

[0023] Figure 2 This is a partial structural diagram of the fixed blade assembly in an embodiment of the thermal printer of the present invention.

[0024] Figure 3 This is a partial structural diagram of the thermal printer embodiment of the present invention when the locking lever is in the unlocked state.

[0025] Figure 4 This is a structural diagram of the fixed blade assembly in an embodiment of the thermal printer of the present invention.

[0026] Figure 5This is an exploded view of the fixed blade assembly in an embodiment of the thermal printer of the present invention.

[0027] Figure 6 This is a structural diagram of the fixed blade assembly in an embodiment of the thermal printer of the present invention from another perspective.

[0028] Figure 7 This is a partial structural diagram of the flip-top section of an embodiment of the thermal printer of the present invention.

[0029] Figure 8 This is a structural diagram of the flip-top fixing bracket in an embodiment of the thermal printer of the present invention.

[0030] Figure 9 This is an exploded view of the flip-top fixing bracket and the moving blade assembly in an embodiment of the thermal printer of the present invention.

[0031] Figure 10 This is a structural diagram of the moving blade assembly in an embodiment of the thermal printer of the present invention.

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0033] Reference Figures 1 to 6 The thermal printer includes a base 1, a flip cover 2, a rubber roller 12, a thermal sheet 24, and a cutter module. The rubber roller 12 is mounted on the base 1, and the thermal sheet 24 is mounted on the flip cover 2. The base 1 has a paper tray, and the flip cover 2 closes onto the paper tray and connects to the base 1. A paper output port 10 is formed between the flip cover 2 and the base 1. The thermal sheet 24 and the rubber roller 12 are opposite each other and form a paper feeding channel, which connects the paper output port 10 and the paper tray.

[0034] The base 1 is provided with a base fixing frame 11, which is provided with a fixing connecting plate 111 and two fixing side walls 112. The fixing connecting plate 111 extends along the paper width direction Y, and the fixing side walls 112 extend along the height direction Z. The two fixing side walls 112 are located on both sides of the paper width direction Y. The fixing connecting plate 111 is connected between the two fixing side walls 112. The fixing connecting plate 111 is provided with at least two slots 115, which are arranged along the paper width direction Y. Each fixing side wall 112 is provided with a fixing mounting groove 113 along the height direction Z. The fixing mounting groove 113 is provided with an inlet above the height direction Z.

[0035] The cutting module includes a moving blade assembly and a fixed blade assembly 3. The fixed blade assembly 3 includes a fixed blade 32 and a fixed blade support 31. The fixed blade support 31 is provided with a fixed blade connecting plate 311 and two positioning sidewalls 312. The fixed blade connecting plate 311 extends along the paper width direction Y and is fixedly connected to the base 1. The fixed blade 32 is fixedly connected to the fixed blade support 31 along the paper width direction Y and is located below the paper outlet 10. The fixed blade connecting plate 311 is provided with at least two latches 313 below the height direction Z, and the two latches 313 are arranged along the paper width direction Y.

[0036] The fixed blade connecting plate 311 is fitted with a clearance fit in the two fixed mounting slots 113 along the height direction Z. The fixed blade connecting plate 311 can slide in the fixed mounting slots 113 along the paper width direction Y. The buckle 313 can be detachably engaged with the bayonet 115. The two positioning sidewalls 312 are located on both sides of the paper width direction Y, respectively. The positioning sidewalls 312 are perpendicularly connected to the fixed blade connecting plate 311. The fixed blade connecting plate 311 is connected between the two positioning sidewalls 312. The two positioning sidewalls 312 are located on the same side of the fixed sidewall 112 based on the outer side of the paper width direction Y, and the positioning sidewalls 312 are adjacent to the fixed sidewall 112.

[0037] The base 1 has a locking groove 15 on the outer side of the fixed side wall 112 based on the paper width direction Y. The thermal printer also includes a locking rod 14, which is movably disposed in the locking groove 15. The locking rod 14 can be moved to the outer side of the positioning side wall 312 based on the paper width direction Y and is adjacent to the positioning side wall 312.

[0038] The locking groove 15 has a first hinge portion 151 at its lower end, which is arranged as a hinge hole. The locking rod 14 has a second hinge portion 142 and an operating portion 141. The second hinge portion 142 is located at the lower end and is arranged as a hinge post. The outer edge of the hinge post is provided with a guide slope 143, which slides with the groove wall of the locking groove 15. The first hinge portion 151 is hinged to the second hinge portion 142. The operating portion 141 is located on the upper surface of the base 1. The operating portion 141 rotates around the second hinge portion 142 and moves to a position adjacent to the positioning side wall 312.

[0039] Two fixed sidewalls 112 are respectively provided with roller mounting grooves 114. The axial end of the roller 12 is installed in the roller mounting groove 114. The roller 12 is located inside the fixed blade 32 based on the paper feeding channel. The fixed blade assembly 3 also includes a fixed blade cover plate 33. The fixed blade cover plate 33 is installed above the fixed blade connecting plate 311. The fixed blade cover plate 33 is located inside the fixed blade 32 based on the paper feeding channel. An clearance mounting groove 314 is provided above the fixed blade connecting plate 311. An mounting plane 315 is provided on the upper edge of the clearance mounting groove 314. The fixed blade cover plate 33 is fixedly installed on the mounting plane 315. The fixed blade cover plate 33 is arranged between the roller 12 and the fixed blade 32 with clearance fit.

[0040] By using the clearance fit between the fixed blade connecting plate 311 and the fixed mounting groove 113, the blade is slidably inserted along the paper width direction and initially fixed by the engagement of the buckle 313 and the bayonet 115. This design eliminates the need for screws when installing the fixed blade assembly. Based on the initial engagement, the positioning sidewall 312 located outside the fixed sidewall 112 and the limiting fit between the positioning sidewall 312 and the operating part 141 of the locking rod 14 achieve secondary locking of the fixed blade assembly in the paper width direction. This effectively prevents the fixed blade assembly from accidentally shifting due to vibration or force during use, ensuring the stability and accuracy of the cutting process, and providing stable and reliable dual positioning and locking.

[0041] Reference Figures 7 to 10 The flip cover 2 is equipped with a flip cover fixing frame 21 and two locking hooks 23. The flip cover fixing frame 21 is equipped with a top connecting plate 211 and two mounting side walls 212. The top connecting plate 211 extends along the paper width direction Y, and the mounting side walls 212 extend along the height direction Z. The two mounting side walls 212 are located on both sides of the paper width direction Y, and the top connecting plate 211 is connected between the two mounting side walls 212. The flip cover fixing frame 21 is equipped with a front side baffle 213 and a rear side baffle 213 on both sides of the paper length direction X. Plate 214, front baffle 213 connected to top connecting plate 211 and two mounting sidewalls 212, rear baffle 214 connected to top connecting plate 211 and two mounting sidewalls 212, front baffle 213, rear baffle 214, top connecting plate 211 and two mounting sidewalls 212 form a top mounting cavity 210, the top mounting cavity 210 is provided with an insertion port below in the height direction Z, and each mounting sidewall 212 is provided with a first positioning groove 218 along the height direction Z.

[0042] The thermal printer also includes two first elastic elements 216, each an elastic spring, which elastically abuts against the moving blade housing 251 and the top connecting plate 211. The top connecting plate 211 has two spring holes 217, with one end of each spring located within one of the spring holes 217. The first elastic elements 216 connect the moving blade housing 251 and the flip-top fixing bracket 21, and are arranged along the height direction Z. The first elastic elements 216 apply an elastic force to the moving blade housing 251 towards the fixed blade 32. The front baffle 213 has an abutment plate 215, with an abutment protrusion 2151 at its end, which tightly engages with the middle of the moving blade housing 251.

[0043] Two locking hooks 23 are located on both sides of the paper width direction Y. Each locking hook 23 is hinged to the mounting side wall 212 on the same side. The locking hook 23 is provided with a reset fulcrum 232, a hinge part 231, a hook part 233 and a lever part 234. The hinge part 231 is hinged to the mounting side wall 212 and is located in the middle of the locking hook 23. The reset fulcrum 232 is located in the upper part of the locking hook 23, and the hook part 233 and the lever part 234 are located in the lower part of the locking hook 23.

[0044] The thermal printer also includes a second elastic element 22, which is connected between the locking hook 23 and the flip cover fixing frame 21. The second elastic element 22 is connected between the reset fulcrum 232 and the flip cover fixing frame 21. The second elastic element 22 applies a locking force to the hook 233 to engage with the locking post 252.

[0045] The moving blade assembly 25 includes a moving blade housing 251, a moving blade, and a moving blade drive device. The moving blade and the moving blade drive device are disposed inside the moving blade housing 251. The moving blade is located above the paper outlet 10. The moving blade drive device is connected to the moving blade and drives the moving blade to move toward the fixed blade. The moving blade housing 251 has locking pins 252 respectively provided on the housing sidewalls 253 on both sides of the paper width Y direction. The moving blade housing 251 is installed into the top mounting cavity 210 from the insertion port. The locking pins 252 are located in the first positioning slide groove 218 and are in clearance fit with the first positioning slide groove 218. Under the force of the lever part 234, the hook part 233 can move to the first positioning slide groove 218, and then one side of the hook part 233 engages with the locking pin 252 on the same side to realize the quick assembly of the moving blade assembly 25. When disassembly is required, the lever part 234 is driven to separate the hook part 233 from the locking pin 252.

[0046] Each side mounting sidewall 212 is provided with a second positioning slide groove 219 along the height direction Z. The second positioning slide groove 219 and the first positioning slide groove 218 are located at the upper and lower ends of the height direction Z, respectively. Positioning posts 255 are provided on the sidewalls of both housings. The positioning posts 255 extend along the height direction Z. The positioning posts 255 and the locking posts 252 are located at the upper and lower ends of the height direction Z, respectively. The positioning post 255 on one side is clearance-fitted with the second positioning slide groove 219 on the same side.

[0047] The moving blade housing 251 has a moving blade cover 254 below it in the height direction Z. The moving blade cover 254 is located outside the moving blade based on the paper feeding channel, and the outer edge of the moving blade cover 254 is connected to the edge of the flip cover 2.

[0048] As can be seen from the above, the fixed blade assembly can be slidably inserted along the paper width direction by means of the gap fit between its fixed blade connecting plate and the preset fixed mounting slot on the base fixing frame. The fixed blade connecting plate is also installed in the fixed mounting slot along the height direction to achieve initial guidance and positioning. Then, the snap-fit ​​and snap-lock are used to achieve initial fixation. This design makes the installation of the fixed blade assembly screwless. It only requires pushing in and aligning to complete the basic positioning and connection, which greatly simplifies the operation steps, improves the installation and disassembly efficiency, and also realizes the quick and tool-free installation and disassembly of the cutting module.

[0049] In addition, based on the initial engagement, the positioning sidewall located outside the fixed sidewall and the locking rod are used to achieve secondary locking of the fixed blade assembly in the paper width direction. The locking rod can be easily operated through the hinge structure and moved to a position adjacent to the positioning sidewall. This effectively prevents the fixed blade assembly from being accidentally displaced due to vibration or force during use, ensuring the stability and accuracy of the cutting process, and providing stable and reliable dual positioning and locking.

[0050] Furthermore, this design treats the moving blade assembly as an independent module, which can be directly inserted into the top mounting cavity through the insertion port on the flip-top fixing bracket. By utilizing the engagement or release of the locking hooks on both sides with the locking pins on the moving blade housing, and with the guidance of the positioning slide, the moving blade assembly can be installed and disassembled without any tools. This greatly simplifies the maintenance process, improves usability, and achieves rapid modular assembly and disassembly of the moving blade assembly.

[0051] Furthermore, the clearance fit between the first and second positioning grooves on the mounting sidewall and the locking and positioning pins on the moving blade housing provides precise positioning of the moving blade assembly in both the paper width and height directions. Combined with the continuous elastic force provided by the first elastic element, this ensures precise alignment and constant contact pressure between the moving and fixed blades during cutting, thereby achieving a stable and reliable cutting effect and ensuring the assembly accuracy and operational stability of the cutting mechanism.

[0052] Furthermore, the flip cover fixing frame adopts a top mounting cavity structure consisting of a top connecting plate, mounting side walls, and front and rear side baffles, which provides a stable mounting space and protection for the moving knife module. The tight fit between the abutting protrusion on the front baffle and the middle of the moving knife housing further restricts the displacement of the module, effectively reducing vibration and noise during operation, and enhancing the overall integrity and reliability of the structure.

[0053] The locking mechanism integrates a hinge, hook, lever, and reset fulcrum, and provides automatic reset locking force via a second elastic element. Users can easily unlock by simply levering the lever; upon releasing, the elastic element automatically restores the locked state. The operation is intuitive and effortless, effectively preventing accidental loosening of the cutting module during printing. Furthermore, as the cutting module is a consumable part, its modular design allows users to replace the cutting module individually and quickly without replacing the entire cutting module or sending the printer for refurbishment. This significantly reduces long-term maintenance and time costs, improving the printer's lifespan and economic efficiency.

[0054] Of course, the above embodiments are only preferred embodiments of this case. Based on the concept of this case, the above concept can also be applied to other types of thermal printers, such as the rubber roller being set on the base and the thermal sheet being set on the flip cover, which can also achieve the purpose of this case. All the above changes are within the protection scope of this invention.

Claims

1. A thermal printer with a cutter module convenient to assemble and disassemble, comprising a base, a cover, a rubber roller, a thermal sheet and a cutter module, one of the rubber roller and the thermal sheet is arranged on the base, the other of the rubber roller and the thermal sheet is arranged on the cover, the cover is connected with the base, a paper outlet is formed between the cover and the base, the thermal sheet and the rubber roller are opposite and form a paper passing channel, the paper passing channel is communicated with the paper outlet; characterized in that: the base is provided with a base fixing frame, the base fixing frame is provided with a fixing connecting plate and two fixing side walls, the fixing connecting plate extends along a paper width direction, the fixing side walls extend along a height direction, the two fixing side walls are respectively located on both sides of the paper width direction, the fixing connecting plate is connected between the two fixing side walls, the fixing connecting plate is provided with a bayonet, each side of the fixing side wall is provided with a fixing mounting groove along the height direction, the fixing mounting groove is provided with an assembling opening above the height direction; the cutter module comprises a moving cutter assembly and a fixed cutter assembly, the fixed cutter assembly comprises a fixed cutter blade and a fixed cutter support, the fixed cutter support is provided with a fixed cutter connecting plate, the fixed cutter connecting plate extends along the paper width direction and is fixedly connected with the base, the fixed cutter blade is fixedly connected on the fixed cutter support along the paper width direction, the fixed cutter blade is located below the paper outlet, the moving cutter assembly is arranged on the cover, the moving cutter assembly comprises a moving cutter blade and a moving cutter driving device, the moving cutter blade is located above the paper outlet, the moving cutter driving device is connected with the moving cutter blade and drives the moving cutter blade to move towards the fixed cutter blade; the fixed cutter connecting plate is provided with a buckle below the height direction, the fixed cutter connecting plate is gap-fittedly mounted in the two fixing mounting grooves along the height direction, the fixed cutter connecting plate can slide in the fixing mounting groove along the paper width direction, and the buckle is separably clamped with the bayonet. 2.The thermal printer according to claim 1, characterized in that: the fixed cutter support is provided with a positioning side wall, the positioning side wall is respectively located on one side of the paper width direction, the positioning side wall is perpendicularly connected with the fixed cutter connecting plate, the positioning side wall is located on the outside of the same side of the fixing side wall based on the paper width direction, and the positioning side wall is adjacent to the fixing side wall. 3.The thermal printer according to claim 2, characterized in that: the base is provided with a lock slot on the outside of the fixing side wall based on the paper width direction, and the thermal printer further comprises a lock rod, the lock rod is movably arranged in the lock slot, and the lock rod can be moved to the outside of the positioning side wall based on the paper width direction and adjacent to the positioning side wall. 4.The thermal printer according to claim 3, characterized in that: the lock slot is provided with a first hinge part, the lock rod is provided with a second hinge part and an operation part, the first hinge part is hinged with the second hinge part, the operation part is located on the upper surface of the base, the operation part rotates around the second hinge part, and the operation part moves to a position adjacent to the positioning side wall.

5. The thermal printer according to claim 4, characterized in that: the first hinge part is arranged as a hinge hole, the second hinge part is arranged as a hinge post, and an outer edge of the hinge post is provided with a guide slope which is in sliding fit with a slot wall of the lock slot.

6. The thermal printer according to claim 2, characterized in that: the fixed knife holder is provided with two positioning side walls, the two positioning side walls are respectively located on both sides of the paper width direction, the fixed knife connecting plate is connected between the two positioning side walls, and the two positioning side walls are respectively located on the same side of the fixed side wall based on the outer side of the paper width direction.

7. The thermal printer according to claim 1, characterized in that: the fixed connecting plate is provided with at least two clamping holes, the two clamping holes are arranged along the paper width direction, and the fixed knife connecting plate is provided with at least two clamping buckles below in the height direction, and the two clamping buckles are arranged along the paper width direction.

8. The thermal printer according to any one of claims 1 to 7, characterized in that: the fixed knife assembly further comprises a fixed knife cover plate, the fixed knife cover plate is installed above the fixed knife connecting plate, and the fixed knife cover plate is located on the inner side of the fixed knife blade based on the paper passing channel.

9. The thermal printer according to claim 8, characterized in that: an avoiding installation slot is arranged above the fixed knife connecting plate, an installation plane is arranged on the upper edge of the avoiding installation slot, and the fixed knife cover plate is fixedly arranged on the installation plane.

10. The thermal printer according to any one of claims 1 to 7, characterized in that: the flip cover is provided with a flip cover fixing frame and a lock hook part, the flip cover fixing frame is provided with a top connecting plate and two installation side walls, the top connecting plate extends along the paper width direction, the installation side walls extend along the height direction, the two installation side walls are respectively located on both sides of the paper width direction, the top connecting plate is connected between the two installation side walls, a top installation cavity is formed between the top connecting plate and the two installation side walls, the top installation cavity is provided with a plug-in opening below in the height direction, and each of the installation side walls is provided with a first positioning sliding groove along the height direction; the two lock hook parts are respectively located on both sides of the paper width direction, each of the lock hook parts is hinged with the installation side wall on the same side, the lock hook part is provided with a hook part and a pulling part, and under the driving of the pulling part, the hook part can be moved to the first positioning sliding groove; the cutter module comprises a moving knife assembly and a fixed knife assembly, the fixed knife assembly comprises a fixed knife blade, the fixed knife blade is arranged on the base and located below the paper outlet, the moving knife assembly comprises a moving knife shell, the moving knife blade and the moving knife driving device are arranged in the moving knife shell, the moving knife shell is provided with a lock post on the shell side wall on both sides of the paper width direction, the moving knife shell is installed into the top installation cavity from the plug-in opening, the lock post is located in the first positioning sliding groove and in gap fit with the first positioning sliding groove, and one side of the hook part is clamped with the lock post on the same side.

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