A thermal printhead and thermal printer

Abstract

The utility model discloses a kind of thermal printing head and thermal printer, thermal printing head includes thermal printing component, printing channel, upper guide, lower guide and black mark sensor installation position.Upper guide and lower guide are located above and below printing channel respectively, form the guiding structure of upper and lower cooperation to guide printing medium through printing channel.Black mark sensor installation position is set on upper guide and lower guide, in the width direction of printing channel, upper guide and lower guide are both provided with two end installation position and middle installation position, and installation position is suitable for installing black mark sensor.Through the black mark sensor of different installation position configuration, it can make that the black mark of printing medium is located left side, right side, middle position or printing medium front and back both can be accurately detected.The utility model is designed by multiple installation position, so that the thermal printer including the thermal printing head of the utility model can be compatible with various different black mark position printing medium, improve the compatibility and versatility of equipment.

Description

Technical Field

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

[0002] Thermal printing, as an important non-impact printing technology, has been widely used in commercial POS systems, logistics and express delivery, label making, and invoice printing due to its advantages such as low noise, high printing speed, low cost, and easy maintenance. However, existing thermal printheads generally suffer from fixed black mark sensor mounting positions and poor compatibility. Traditional thermal printheads typically have only a single black mark sensor mounting position in a fixed location, which means the device can only be used with printing media of specific black mark positions. When it is necessary to change to printing media of different specifications or with different black mark positions, it is often necessary to replace the entire device or make complex modifications, which greatly increases the cost and complexity of use. At the same time, the existing black mark sensor mounting method lacks flexibility and makes it difficult to achieve rapid adjustment and adaptation. This limits the promotion and use of thermal printing equipment in diverse application scenarios and also affects the market competitiveness and user experience of the equipment. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a thermal printhead and thermal printer with strong compatibility.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A thermal printhead includes: a thermal printing assembly for printing on a printing medium; a printing channel through which the printing medium passes and is printed via the thermal printing assembly; an upper guide and a lower guide, respectively located above and below the printing channel, for guiding the printing medium through the printing channel; and a black mark sensor mounting position disposed on the upper and lower guides. In the width direction of the printing channel, both the upper and lower guides are provided with end mounting positions and a middle mounting position, the mounting positions being suitable for mounting a black mark sensor.

[0006] Furthermore, the system includes a base; a pressing assembly that engages with the base, the pressing assembly having a pressure roller; a driving assembly disposed on the base for driving the pressure roller to rotate; wherein, the upper guide member is disposed on the pressing assembly; the thermal printing assembly has a heating plate with a heating wire disposed on the heating plate; the pressure roller is disposed opposite to the heating wire for pressing the printing medium onto the heating wire and moving the printing medium.

[0007] Furthermore, the thermal printing assembly includes a mounting frame with guide protrusions at both ends; the base is correspondingly provided with a movable guide groove, and the guide protrusions are slidably engaged within the movable guide groove; an elastic element is disposed at the end of the mounting frame away from the heating element, and the elastic element presses against the mounting frame to move the heating element toward the pressure roller and abut against the pressure roller; the length direction of the movable guide groove is consistent with the abutment direction between the heating element and the pressure roller, so as to guide the movement direction of the mounting frame.

[0008] Furthermore, the drive assembly includes a motor and a gear set, the gear set including multi-stage gears; a driven gear is provided at the end of the pressure roller; the output shaft of the motor meshes with the driven gear through the gear set to drive the pressure roller to rotate; the gear set is used to adjust the rotational speed of the pressure roller to control the movement speed of the printing medium.

[0009] Furthermore, it also includes a quick-release locking mechanism for detachably connecting the pressing assembly to the base. The quick-release locking mechanism includes: a latch group disposed on the base and distributed along the width direction of the printing channel, including a first latch and a second latch with opposite opening directions; a locking post movably disposed on the pressing assembly, with its two ends corresponding to the first latch and the second latch respectively; a locking post support member disposed on the pressing assembly, including a protruding post with a through hole, the locking post passing through the through hole; and an operating switch disposed at one end of the locking post and rotatably connected to the pressing assembly, having a sliding channel inside; wherein the locking post moves within the sliding channel via the operating switch, thereby locking and disengaging both ends of the locking post from the latch group.

[0010] Furthermore, the black mark sensor mounting position includes a fixing part and a detection part, and the detection part is provided with a through hole; the black mark sensor is fixedly installed through the fixing part and detects the black mark on the printing medium through the through hole of the detection part.

[0011] Furthermore, it also includes: a mechanical lifting lever sensor, disposed on the side of the lower guide member away from the printing channel; a sensing rod, connected to the mechanical lifting lever sensor; a guide rod channel, formed on the lower guide member, with the sensing rod passing through the guide rod channel and movable therein; wherein, when printing media is placed into the printing channel, the printing media pushes the sensing rod, causing it to move towards the mechanical lifting lever sensor, and the mechanical lifting lever sensor detects the presence of printing media based on the position change of the sensing rod; when the printing media is used up or not placed, the sensing rod returns to its initial position under the action of an elastic restoring force.

[0012] Furthermore, a scanning component is disposed at the outlet end of the printing channel; after the printing medium is printed by the thermal printing component, it continues to move along the printing channel to the scanning component for scanning and detection.

[0013] Furthermore, a width limiting element is provided on at least one side of the printing channel to adjust the width of the printing channel to accommodate printing media of different specifications.

[0014] A thermal printer includes the aforementioned thermal printhead.

[0015] The beneficial effects of this utility model are:

[0016] This invention provides a thermal printhead, including a thermal printing assembly, a printing channel, an upper guide, a lower guide, and a black mark sensor mounting position. The upper and lower guides are located above and below the printing channel, respectively, forming a coordinated guide structure to guide the printing medium through the printing channel. The black mark sensor mounting position is located on the upper and lower guides. Along the width of the printing channel, both the upper and lower guides have mounting positions at both ends and a middle mounting position, suitable for mounting the black mark sensor. By configuring the black mark sensor at different mounting positions, the black mark on the printing medium can be accurately detected whether it is located on the left, right, or middle position, or on both sides of the printing medium. This invention, through its flexible configuration design with multiple mounting positions, enables thermal printers including this thermal printhead to be compatible with various printing media with different black mark position designs, significantly improving the compatibility, adaptability, and versatility of the equipment. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention - 1;

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the present invention - 2;

[0020] Figure 3 This is a schematic diagram of the disassembled structure of this utility model;

[0021] Figure 4 This is a cross-sectional structural schematic diagram of the present invention;

[0022] Figure 5 This is a structural schematic diagram of the upper guide member and the lower guide member of this utility model;

[0023] Figure 6 This is a structural schematic diagram of the upper guide member of this utility model;

[0024] Figure 7This is a schematic diagram of the heating element of this utility model.

[0025] in,

[0026] 100. Thermal printing assembly; 110. Heating element; 111. Heating wire; 120. Mounting bracket; 121. Guide post;

[0027] 200. Printing channel; 210. Width limiting component;

[0028] 300. Pressing assembly; 310. Pressure roller; 311. Driven gear; 320. Upper guide component;

[0029] 400. Base; 410. Lower guide component; 420. Moving guide groove; 430. Elastic component;

[0030] 500. Black mark sensor mounting position; 510. Fixing part; 520. Detection part;

[0031] 600. Drive assembly; 610. Motor; 620. Gearbox;

[0032] 700. Quick-release locking mechanism; 710. Locking assembly; 711. First locking latch; 712. Second locking latch; 720. Locking pin; 730. Locking pin support; 740. Operating switch; 741. Sliding channel;

[0033] 800. Mechanical lifting lever sensor; 810. Sensing rod; 820. Guide rod channel;

[0034] 900. Scanning component. Detailed Implementation

[0035] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0036] Reference Figure 1 , Figure 4This invention provides a thermal printhead, including a thermal printing assembly 100, a printing channel 200, an upper guide 320, a lower guide 410, and a black mark sensor mounting position 500. The thermal printing assembly 100 is used to print on printing media, which passes through the printing channel 200 and the thermal printing assembly 100 for printing. The upper guide 320 and lower guide 410 are located above and below the printing channel 200, respectively, to guide the printing media through the printing channel 200. The black mark sensor mounting position 500 is disposed on the upper guide 320 and lower guide 410. In the width direction of the printing channel 200, both the upper guide 320 and lower guide 410 are provided with mounting positions at both ends and a middle mounting position, suitable for mounting the black mark sensor.

[0037] The thermal printing assembly 100 serves as the core printing unit to heat and print the printing medium. The printing channel 200 forms the transmission path of the printing medium, allowing it to pass smoothly through the printing channel 200 and be printed by the thermal printing assembly 100. Meanwhile, the upper guide 320 and the lower guide 410 are located above and below the printing channel 200, respectively, forming a coordinated guiding structure to guide the printing medium to maintain the correct position and orientation as it passes through the printing channel 200.

[0038] Reference Figure 5 , 6 The black mark sensor mounting position 500 is set on the upper guide 320 and the lower guide 410. Along the width direction of the printing channel 200, both the upper guide 320 and the lower guide 410 are provided with mounting positions at both ends and a middle mounting position, so that the mounting positions can be adapted to install the black mark sensor. In practical applications, the black mark sensor is installed at the corresponding black mark sensor mounting position 500 according to the position of the black mark on the printing medium. This allows the black mark on the printing medium to be accurately detected whether it is located on the left, right, or middle position, or on both sides of the printing medium. This significantly improves the compatibility and adaptability of the equipment.

[0039] For example, when using a waybill with a left-side black mark positioning, a black mark sensor can be installed at the left end of the upper guide 320 or lower guide 410 to detect the black mark on the left edge of the waybill. When using a product label with a right-side black mark positioning, a black mark sensor can be installed at the right end to detect the black mark on the right edge of the label. For cash register receipts with a central black mark positioning, a black mark sensor can be installed at the middle mounting position. Similarly, when the black mark on the printing medium is printed on both the front and back, black mark sensors can be installed at the corresponding mounting positions on the upper guide 320 and lower guide 410 simultaneously, ensuring accurate detection regardless of which side of the printing medium the black mark is on. By flexibly configuring the mounting positions, the same thermal printhead can be compatible with various printing media with different black mark position designs, greatly improving the equipment's versatility and market adaptability.

[0040] In a preferred embodiment, refer to Figure 4 The thermal printhead also includes a base 400, a pressing assembly 300, and a drive assembly 600. The base 400 serves as the supporting foundation for the entire device. The pressing assembly 300 is snapped into the base 400 and has a pressure roller 310. The drive assembly 600 is mounted on the base 400 and drives the pressure roller 310 to rotate. An upper guide 320 is mounted on the pressing assembly 300. A lower guide assembly is mounted on the base 400. The thermal printing assembly 100 has a heating element 110, as shown in the figure. Figure 7 Heating plate 110 is provided with heating wire 111. Pressure roller 310 is arranged opposite to heating wire 111 and is used to press the printing medium onto heating wire 111 and drive the printing medium to move.

[0041] Reference Figure 1 , 4 The snap-fit ​​structure between the pressing component 300 and the base 400 facilitates the disassembly and maintenance of the equipment; the relative arrangement of the pressure roller 310 and the heating line 111 ensures that the printing medium can be closely attached to the heating line 111, guaranteeing the printing effect; the setting of the drive component 600 realizes the automatic delivery of the printing medium.

[0042] Snap-fit ​​connections can include, but are not limited to: snap-fit ​​connections, plug-in connections, and rotary locking connections. Snap-fit ​​connections achieve quick installation and removal through elastic snaps; plug-in connections achieve precise positioning through the cooperation of guide grooves and guide posts; and rotary locking connections achieve reliable fixation through rotation.

[0043] Specifically, in a preferred embodiment, referring to Figure 3The thermal printhead also includes a quick-release locking mechanism 700 for detachable connection between the pressing assembly 300 and the base 400. The quick-release locking mechanism 700 includes a latch assembly 710, a locking pin 720, a locking pin support 730, and an operating switch 740. The latch assembly 710 is disposed on the base 400 and distributed along the width direction of the printing channel 200, including a first latch 711 and a second latch 712 with opposite opening directions. The locking pin 720 is movably disposed on the pressing assembly 300, with its two ends corresponding to the first latch 711 and the second latch 712, respectively. The locking pin support 730 is disposed on the pressing assembly 300 and includes a protruding pin with a through hole, the locking pin 720 passing through the through hole. The operating switch 740 is disposed at one end of the locking pin 720 and rotatably connected to the pressing assembly 300, and has a sliding channel 741 inside. The locking pin 720 moves within the sliding channel 741 via the operating switch 740, thereby locking and disengaging both ends of the locking pin 720 from the latch assembly 710.

[0044] The locking pin 720 is movably mounted on the pressing assembly 300, with its two ends corresponding to the first latch 711 and the second latch 712, respectively, thus forming a fit between the locking pin 720 and the latch assembly 710. Meanwhile, the locking pin support 730 is mounted on the pressing assembly 300 and includes a protruding pin structure with a through hole, allowing the locking pin 720 to pass through the through hole and slide within it. The operating switch 740 is mounted on one end of the locking pin 720 and rotatably connected to the pressing assembly 300. Its internal sliding channel 741 provides a guide path for the movement of the locking pin 720. The locking pin 720 can move within the sliding channel 741 via the operating switch 740, thereby realizing the locking and unlocking operations of both ends of the locking pin 720 with the latch assembly 710. The entire process can complete the detachable connection between the pressing assembly 300 and the base 400 without the use of tools.

[0045] In another preferred embodiment, refer to Figure 1 , 4 The thermal printing assembly 100 includes a mounting frame 120 with guide protrusions 121 at both ends. A corresponding movable guide groove 420 is provided on the base 400, and the guide protrusions 121 are slidably engaged within the movable guide groove 420. An elastic element 430 is located at the end of the mounting frame 120 away from the heating element 110. The elastic element 430 presses against the mounting frame 120, causing the heating element 110 to move towards the pressure roller 310 and abut against it. The length direction of the movable guide groove 420 is consistent with the abutment direction between the heating element 110 and the pressure roller 310, thus guiding the movement direction of the mounting frame 120.

[0046] The elastic element 430 allows the heating plate 110 to apply appropriate pressure to the pressure roller 310, ensuring print quality; the cooperation between the guide post 121 and the moving guide groove 420 ensures the accuracy and stability of the movement of the mounting bracket 120; the pressure adjustable design adapts to printing media of different thicknesses.

[0047] The elastic element 430 can preferably be a compression spring, which provides a stable compressive force.

[0048] In one specific embodiment, refer to Figure 2 The drive assembly 600 includes a motor 610 and a gear set 620, which includes multi-stage gears. A driven gear 311 is provided at the end of the pressure roller 310. The output shaft of the motor 610 meshes with the driven gear 311 through the gear set 620 to drive the pressure roller 310 to rotate. The gear set 620 is used to adjust the rotational speed of the pressure roller 310 to control the speed of the printing medium.

[0049] The variable speed gear set 620 enables speed control to meet the needs of different printing speeds; the multi-stage gear configuration improves transmission efficiency and reduces noise; the integrated design of the driven gear 311 and the pressure roller 310 simplifies the structure and improves reliability.

[0050] The 620 gear set can include: a two-stage reduction gear set (reduction ratio 1:10-1:50), a three-stage reduction gear set (reduction ratio 1:50-1:200), a planetary gear reducer, etc. Different reduction ratios are suitable for different printing speed requirements, and the planetary gear reducer is characterized by its compact structure and high load-bearing capacity.

[0051] In one specific embodiment, refer to Figure 5 , 6 The black mark sensor mounting position 500 includes a fixing part 510 and a detection part 520, the detection part 520 being provided with a through hole. The black mark sensor is fixedly mounted via the fixing part 510 and detects black marks on the printing medium through the through hole of the detection part 520.

[0052] The fixing part 510 has a threaded hole structure, and the detection part 520 has a through hole. The black mark sensor is fixedly connected through the threaded hole of the fixing part 510 to achieve a stable mechanical installation, and the black mark sensor identifies the black mark through the through hole of the detection part 520, thereby completing the detection of the black mark on the printing medium.

[0053] The fixing part 510 adopts a threaded hole structure, which allows the black mark sensor to be firmly installed through a threaded connection, avoiding the problem of sensor loosening due to vibration during printing. At the same time, the threaded connection also facilitates the adjustment of the sensor position and subsequent maintenance and replacement. The through hole setting of the detection part 520 ensures the unobstructed detection optical path, allowing the beam of the black mark sensor to pass through the through hole and reach the surface of the printing medium without obstruction, thereby improving the accuracy and reliability of black mark detection. The separate design of the fixing part 510 and the detection part 520 forms a modular installation method, which facilitates the adaptation and use of black mark sensors of different specifications and types.

[0054] In a preferred embodiment, refer to Figure 5 The thermal printhead also includes a mechanical lift-up sensor 800, a sensing rod 810, and a guide rod channel 820. The mechanical lift-up sensor 800 is located on the side of the lower guide member 410 away from the print channel 200. The sensing rod 810 is connected to the mechanical lift-up sensor 800. The guide rod channel 820 is formed on the lower guide member 410, and the sensing rod 810 passes through and can move within the guide rod channel 820. When printing media is placed into the print channel 200, the printing media pushes the sensing rod 810, causing it to move towards the mechanical lift-up sensor 800. The mechanical lift-up sensor 800 detects the presence of printing media based on the positional change of the sensing rod 810. When the printing media is used up or not placed in the print channel, the sensing rod 810 returns to its initial position under the action of an elastic restoring force.

[0055] In a preferred embodiment, refer to Figure 4 The thermal printhead also includes a scanning component 900, which is located at the output end of the print channel 200. After the printing medium is printed by the thermal printing component 100, it continues to move along the print channel 200 to the scanning component 900 for scanning and detection.

[0056] By positioning the scanning component 900 at the output end of the printing channel 200, a post-printing inspection process is established. This allows the printing media, after being printed by the thermal printing component 100, to continue moving along the printing channel 200 to the scanning component 900 for scanning and inspection, thus achieving an integrated printing and scanning process. This ensures that each printed medium can be immediately inspected for quality and content verification after printing, while the placement of the scanning component 900 at the output end maintains a smooth media flow path, avoiding repeated handling and additional processing steps.

[0057] In one specific embodiment, refer to Figure 5 A width limiting member 210 is provided on at least one side of the printing channel 200 to adjust the width of the printing channel 200 to accommodate printing media of different sizes.

[0058] An adjustable channel boundary is formed by setting a width limiting element 210 on at least one side of the printing channel 200. Specifically, the width limiting element 210 is a width limiting plate structure, which can be set on the left, right, or both sides of the printing channel 200. The thickness of the width limiting plate can be different specifications such as 1mm or 2mm, which need to be set according to the specific printing requirements and media specifications. This width limiting plate configuration can be used to adjust the width of the printing channel 200 to adapt to different specifications of printing media. At the same time, after setting the width limiting element 210, the position of the black mark detection position also needs to be adjusted accordingly to ensure that the black mark sensor can be accurately aligned with the adjusted position of the printing media, so that the black mark on the printing media can be accurately identified.

[0059] The width limiting plates and black mark detection positions are adjusted synchronously to ensure positioning and detection of media of different widths. For example, when switching from printing 82mm wide express waybills to printing 80mm wide cash receipts, 1mm thick width limiting plates are first installed on both sides of the printing channel 200, reducing the effective width of the printing channel 200 from 82mm to 80mm. Then, the black mark sensor is adjusted from its original mounting position adapted to the 82mm waybill to its position adapted to the 80mm receipt. When the 80mm wide cash receipt passes through the adjusted printing channel 200, the two sides of the receipt will be guided and constrained by the width limiting plates to maintain centered transmission, achieving printing positioning. When reprinting 82mm express waybills, simply remove the width limiting plates to restore the original width of the printing channel 200, allowing the same thermal printhead to quickly adapt to the needs of different printing media.

[0060] A thermal printer with the aforementioned thermal printhead. This thermal printer can achieve high-quality, high-efficiency thermal printing, while also possessing good maintainability and versatility.

[0061] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A thermal printhead, characterized in that, include: Thermal printing assembly, used for printing on printing media; A printing channel through which the printing medium is printed via the thermal printing assembly; The upper guide and the lower guide are located above and below the printing channel, respectively, and are used to guide the printing medium through the printing channel; The black mark sensor mounting positions are provided on the upper guide and the lower guide. In the width direction of the printing channel, both the upper guide and the lower guide are provided with mounting positions at both ends and a mounting position in the middle. The mounting positions are suitable for mounting the black mark sensor.

2. The thermal printhead according to claim 1, characterized in that, Base; A pressing assembly is engaged with the base, and the pressing assembly has a pressure roller; A drive assembly, mounted on the base, is used to drive the pressure roller to rotate; The upper guide member is disposed on the pressing assembly; The thermal printing assembly has a heating element, and the heating element is provided with heating wires; The pressure roller is positioned opposite to the heating line and is used to press the printing medium onto the heating line and move the printing medium.

3. The thermal printhead according to claim 2, characterized in that, The thermal printing assembly includes a mounting frame, and guide protrusions are provided at both ends of the mounting frame; The base is provided with a corresponding movable guide groove, and the guide protrusion is slidably engaged in the movable guide groove; An elastic element is disposed at the end of the mounting frame away from the heating element. The elastic element presses against the mounting frame to move the heating element toward the pressure roller and abut against the pressure roller. The length direction of the movable guide groove is consistent with the contact direction between the heating element and the pressure roller, so as to guide the movement direction of the mounting frame.

4. The thermal printhead according to claim 2, characterized in that, The drive assembly includes a motor and a gear set, the gear set including multi-stage gears; The end of the pressure roller is provided with a driven gear; The output shaft of the motor drives the pressure roller to rotate by meshing with the driven gear through the gear set. The variable speed gear set is used to adjust the rotational speed of the pressure roller to control the movement speed of the printing medium.

5. The thermal printhead according to claim 2, characterized in that, It also includes a quick-release locking mechanism for enabling a detachable connection between the pressing assembly and the base, the quick-release locking mechanism comprising: A locking assembly, disposed on the base and distributed along the width direction of the printing channel, includes a first locking assembly and a second locking assembly with opposite opening directions; A locking pin is movably mounted on the pressing assembly, with its two ends corresponding to the first locking buckle and the second locking buckle, respectively. A locking post support is provided on the pressing assembly, including a protruding post with a through hole, the locking post passing through the through hole; An operation switch is located at one end of the locking pin and is rotatably connected to the pressing assembly, and has an internal sliding channel; The locking pin moves within the sliding channel via the operating switch, thereby locking and disengaging both ends of the locking pin from the latch assembly.

6. The thermal printhead according to claim 1, characterized in that, The black mark sensor mounting position includes a fixing part and a detection part, and the detection part is provided with a through hole; The black mark sensor is fixedly installed by the fixing part and detects the black mark on the printing medium through the through hole of the detection part.

7. The thermal printhead according to claim 1, characterized in that, Also includes: A mechanical lifting sensor is located on the side of the lower guide away from the printing channel; The sensing rod is connected to the mechanical lifting rod sensor; A guide rod channel is provided on the lower guide member, and the sensing rod passes through the guide rod channel and can move therein; When the printing medium is placed into the printing channel, the printing medium pushes the sensing rod to move it toward the mechanical lifting rod sensor. The mechanical lifting rod sensor detects the presence of the printing medium based on the position change of the sensing rod. When the printing medium is used up or not inserted, the sensing rod returns to its initial position under the action of elastic restoring force.

8. The thermal printhead according to claim 1, characterized in that, A scanning component is disposed at the output end of the printing channel; After the printing medium is printed by the thermal printing component, it continues to move along the printing channel to the scanning component for scanning and detection.

9. The thermal printhead according to claim 1, characterized in that, A width limiting element is provided on at least one side of the printing channel to adjust the width of the printing channel to accommodate printing media of different sizes.

10. A thermal printer, characterized in that, Includes a thermal printhead as claimed in any one of claims 1-9.

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