Label printer

Abstract

The label printer comprises a mounting shaft, a thermal transfer ribbon driving wheel set, a thermal transfer ribbon driving shaft set and a clamping piece, and the thermal transfer ribbon driving wheel set is arranged on the mounting shaft in a sleeving mode; the thermal transfer ribbon driving shaft group comprises a thermal transfer ribbon driving shaft, and the thermal transfer ribbon driving shaft sleeves the mounting shaft and is coupled with the thermal transfer ribbon driving wheel group, so that the thermal transfer ribbon driving shaft can drive a thermal transfer ribbon to be wound under the action of the thermal transfer ribbon driving wheel group; in the axial direction of the mounting shaft, the clamping piece sleeves and is clamped on the mounting shaft from one end, far away from the thermal transfer ribbon driving wheel set, of the thermal transfer ribbon driving shaft, and the clamping matching of the clamping piece and the mounting shaft can effectively limit the axial position of the thermal transfer ribbon driving shaft on the mounting shaft, so that the rotation stability of the thermal transfer ribbon driving shaft can be maintained; thermal transfer ribbon winding displacement caused by axial deviation of the thermal transfer ribbon driving shaft is reduced, and then the printing quality of the label printer is guaranteed. Compared with a screw locking installation mode, the clamping structure is simple in assembly process, tools are not needed, the operation difficulty can be reduced, and the production efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing, in particular to a label printer. BACKGROUND

[0002] The label printer transfers ink on the carbon tape to the surface of the label paper by applying heat and pressure through the print head, thereby forming the required text and barcode information. In the printing operation of the label printer, the carbon tape drive shaft in the body drives the carbon tape winding shaft and the carbon tape unwinding shaft in the carbon tape cartridge to rotate in the same direction to realize carbon tape movement updating. In the related technology, the carbon tape drive shaft is generally positioned axially by screw locking. However, the installation method by screw locking is not only inefficient, but also requires additional installation tools and is cumbersome to operate. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a label printer which can solve the problem of complicated installation and removal of the positioning member of the carbon tape drive shaft in the label printer.

[0004] The embodiments of the present application provide a label printer, which comprises a mounting shaft, a carbon tape drive wheel set, a carbon tape drive shaft set and a clamping piece. The carbon tape drive wheel set is sleeved on the mounting shaft. The carbon tape drive shaft set comprises a carbon tape drive shaft, which is sleeved on the mounting shaft and coupled with the carbon tape drive wheel set, so that the carbon tape drive shaft can drive the carbon tape to wind under the action of the carbon tape drive wheel set. In the axial direction of the mounting shaft, the clamping piece is arranged at one end of the carbon tape drive shaft away from the carbon tape drive wheel set, and the clamping piece is sleeved on the mounting shaft and clamped with the mounting shaft to limit the position of the carbon tape drive shaft in the axial direction of the mounting shaft.

[0005] In some embodiments, the mounting shaft has a clamping matching part which is clamped and matched with the clamping piece. In the axial direction of the mounting shaft, the clamping matching part is located on the side of the carbon tape drive shaft away from the carbon tape drive wheel set.

[0006] In some embodiments, in the axial direction of the mounting shaft, the clamping matching part is arranged at a distance from the carbon tape drive shaft, and the distance L satisfies: 2mm≤L≤5mm.

[0007] In some embodiments, the clamping piece and the carbon tape drive shaft are arranged separately.

[0008] In some embodiments, the clamping piece comprises a limiting part and a clamping part. In the axial direction of the mounting shaft, the limiting part abuts against the carbon tape drive shaft. The mounting shaft has a clamping matching part which is clamped and matched with the clamping part.

[0009] In some embodiments, there are multiple snap-fit ​​portions, and each snap-fit ​​portion is integrally formed with the limiting portion.

[0010] In some embodiments, the ribbon drive shaft has a guide hole inside, and the mounting shaft passes through the guide hole; the snap-fit ​​member includes a guide portion, which is sleeved on the mounting shaft, and a portion of the guide portion is disposed in the guide hole.

[0011] In some embodiments, the guide portion and the carbon ribbon drive shaft define a wall spacer for the guide through hole, and the distance between them is D, where D satisfies 0.1mm≤D≤1mm.

[0012] In some embodiments, the snap-fit ​​element is integrally formed with the ribbon drive shaft.

[0013] In some embodiments, the end of the mounting shaft away from the carbon belt drive wheel assembly has a guide surface, which is an inclined surface that slopes toward the side where the carbon belt drive wheel assembly is located.

[0014] In some embodiments, the snap-fit ​​component includes a plurality of snap-fit ​​portions, which are evenly distributed around the mounting shaft in the circumferential direction; the mounting shaft has a snap-fit ​​mating portion, which is an annular groove; the snap-fit ​​portion includes a hook and a snap-fit ​​body, the hooks of the plurality of snap-fit ​​portions are all disposed in the annular groove, and the surface of the snap-fit ​​body is fitted against the outer peripheral wall of the mounting shaft.

[0015] In some embodiments, the snap-fit ​​component includes two snap-fit ​​portions that are symmetrically arranged about the mounting axis.

[0016] In some embodiments, the snap-fit ​​member includes a snap-fit ​​portion, the mounting shaft has a snap-fit ​​mating portion, and the snap-fit ​​portion snaps into the snap-fit ​​mating portion; along the axial direction of the mounting shaft, the snap-fit ​​portion and the snap-fit ​​mating portion are spaced apart, and the distance is H, where H satisfies: 0.2mm≤H≤1mm.

[0017] In some embodiments, the ribbon drive shaft has a guide hole inside; the label printer also includes a bearing, which is sleeved on the mounting shaft and located in the guide hole and connected to the ribbon drive shaft.

[0018] In some embodiments, the ribbon drive shaft assembly further includes: a fixed shaft, coaxially sleeved on the mounting shaft and rotatably mounted on the mounting shaft, with the ribbon drive shaft mounted at one end of the fixed shaft; a sleeve connected to the other end of the fixed shaft; and a connector, one end of which is sleeved around the sleeve and the other end connected to the ribbon drive wheel assembly, thereby driving the ribbon drive shaft to rotate around the mounting shaft through the connector, the sleeve, and the fixed shaft under the drive of the ribbon drive wheel assembly.

[0019] In some embodiments, the label printer further includes a ribbon cartridge, which includes a ribbon take-up shaft and a ribbon unwind shaft; the ribbon take-up shaft is coupled to the ribbon drive shaft.

[0020] According to an embodiment of this application, in the axial direction of the mounting shaft, a snap-fit ​​component is sleeved and snapped onto the end of the ribbon drive shaft away from the ribbon drive wheel assembly. The snap-fit ​​engagement between the snap-fit ​​component and the mounting shaft effectively restricts the axial position of the ribbon drive shaft, helping to maintain the rotational stability of the ribbon drive shaft, reducing ribbon winding displacement caused by axial offset of the ribbon drive shaft, and thus ensuring the printing quality of the label printer. Compared to screw-locking installation methods, the snap-fit ​​structure of this application has a simple assembly process, requires no tools, helps reduce operational difficulty, and improves production efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a label printer according to an embodiment of this application;

[0023] Figure 2 This is an exploded structural diagram of a label printer according to an embodiment of this application;

[0024] Figure 3 This is a partial structural diagram of a label printer according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the mounting shaft according to one embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of a snap-fit ​​connector according to an embodiment of this application;

[0027] Figure 6This is an exploded structural diagram of a carbon belt drive shaft assembly according to an embodiment of this application;

[0028] Figure 7 This is a partial cross-sectional view of a label printer according to an embodiment of this application.

[0029] Figure label:

[0030] 1. Label printer;

[0031] 10. Mounting shaft; 11. Fixing part; 12. Mounting part; 110. Snap-fit ​​part; 120. Guide surface; 20. Carbon belt drive wheel assembly;

[0032] 30. Carbon belt drive shaft assembly; 31. Carbon belt drive shaft; 310. Guide through hole; 32. Fixed shaft; 33. Sleeve; 34. Connecting piece; 35. Bearing;

[0033] 40. Snap-fit ​​component; 41. Limiting part; 42. Snap-fit ​​part; 421. Snap hook; 422. Snap-fit ​​body; 43. Guide part;

[0034] 50. Fuselage; 51. Mounting bracket;

[0035] 60. Ribbon box; 61. Ribbon take-up spool; 62. Ribbon unwind spool;

[0036] 70. Rubber roller assembly. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] Label printers print images and text by heat-pressing a ribbon onto label paper. A label printer consists of a main unit and a ribbon cartridge mounted on the main unit. The main unit has a ribbon drive shaft, and the ribbon cartridge is mounted on the drive shaft. The rotation of the drive shaft moves the ribbon within the cartridge. During a printing operation, if the ribbon drive shaft shifts, the ribbon will also shift, affecting print quality.

[0039] In related technologies, the ribbon drive shaft is axially fixed by screw locking. The ribbon drive shaft is sleeved on a mounting shaft, and screws are screwed into the end of the mounting shaft to limit the displacement of the ribbon drive shaft. The screw locking installation requires precise alignment and additional tools, resulting in low assembly efficiency on the production line. Based on this, the embodiments of this application provide a label printer.

[0040] Please see Figures 1-2The label printer 1 includes a mounting shaft 10, a ribbon drive wheel assembly 20, a ribbon drive shaft assembly 30, and a snap-fit ​​component 40. The ribbon drive wheel assembly 20 is sleeved on the mounting shaft 10, and the ribbon drive shaft assembly 30 includes a ribbon drive shaft 31, which is sleeved on the mounting shaft 10 and coupled to the ribbon drive wheel assembly 20. During printing, the ribbon drive wheel assembly 20 can rotate under the drive of a motor, and the ribbon drive shaft 31 can drive the ribbon to wind under the action of the ribbon drive wheel assembly 20.

[0041] Please see Figures 2-3 In the axial direction of the mounting shaft 10, a snap-fit ​​member 40 is located at the end of the ribbon drive shaft 31 away from the ribbon drive wheel assembly 20. The snap-fit ​​member 40 is sleeved on the mounting shaft 10 and snaps into it. The snap-fit ​​engagement between the snap-fit ​​member 40 and the mounting shaft 10 effectively restricts the axial position of the ribbon drive shaft 31 on the mounting shaft 10, helps maintain the rotational stability of the ribbon drive shaft 31, reduces unnecessary ribbon movement caused by axial offset of the ribbon drive shaft 31, and ensures print quality. Compared to screw locking, the snap-fit ​​limiting device in this embodiment is simple and convenient to install, requires no additional tools, and has low operational difficulty.

[0042] In this embodiment, the label printer 1 further includes a body 50, within which a mounting bracket 51 is provided, and the mounting shaft 10 is mounted on the mounting bracket 51. Figure 3 As shown, the mounting shaft 10 includes a fixing part 11 and a mounting part 12. The mounting part 12 is connected to the fixing part 11. The mounting bracket 51 has a mounting hole. The fixing part 11 is connected to the mounting bracket 51. The mounting part 12 extends away from the fixing part 11 and passes through the mounting through hole. The portion of the mounting part 12 extending out of the mounting hole is used to mount the carbon ribbon drive shaft assembly 30 and the snap-fit ​​member 40. The mounting bracket 51 has a mounting cavity for accommodating the fixing part 11. The mounting hole communicates with the mounting cavity. The body 50 is also provided with a positioning member detachably connected to the mounting bracket 51. Along the axial direction of the mounting shaft 10, the positioning member abuts against the fixing part 11 from the end of the fixing part 11 away from the mounting part 12, so that the fixing part 11 abuts against the partial wall surface of the mounting bracket 51 used to define the mounting cavity, thereby defining the position of the mounting shaft 10 relative to the mounting bracket 51.

[0043] Alternatively, the fixing part 11 can also be mounted to the mounting bracket 51 by fasteners, for example, the fixing part 11 can be mounted to the mounting bracket 51 by bolts or screws, so as to define the position of the mounting shaft 10 relative to the mounting bracket 51.

[0044] In some embodiments, the mounting shaft 10 has a snap-fit ​​portion 110 that engages with a snap-fit ​​member 40. The snap-fit ​​member 40 is locked in place by elastic deformation and mechanical engagement with the snap-fit ​​portion 110, thereby creating a limit in the axial direction of the mounting shaft 10. In the axial direction of the mounting shaft 10, the snap-fit ​​portion 110 is located on the side of the ribbon drive shaft 31 away from the ribbon drive wheel assembly 20. The snap-fit ​​member 40 applies a force to the end face of the ribbon drive shaft 31 to create a limit, thereby reducing the impact of the snap-fit ​​force on the rotation of the ribbon drive shaft 31 and preventing axial displacement of the ribbon drive shaft 31 due to transmission torque. Furthermore, placing the snap-fit ​​portion 110 on one side of the ribbon drive shaft 31 rather than inside the ribbon drive shaft 31 facilitates the installation and removal of the snap-fit ​​member 40, and makes it easier to determine whether the snap-fit ​​member 40 is correctly installed, thereby reducing the risk of performance degradation or failure due to installation errors.

[0045] In some embodiments, the snap-fit ​​part 110 and the ribbon drive shaft 31 are spaced apart along the axial direction of the mounting shaft 10. The distance between the snap-fit ​​part 110 and the ribbon drive shaft 31 is L, which satisfies: 2mm≤L≤5mm. By controlling the distance L to meet the above range, installation space is provided for the snap-fit ​​part 40, while avoiding the snap-fit ​​part 40 from occupying too much axial space, which would increase the size of the label printer 1 along the axial direction of the mounting shaft 10.

[0046] In some embodiments, the snap-fit ​​connector 40 and the ribbon drive shaft 31 are separately configured, making the installation and removal of the snap-fit ​​connector 40 more independent, facilitating the individual replacement and maintenance of the snap-fit ​​connector 40 or the ribbon drive shaft 31, and reducing equipment maintenance costs. For example, when the snap-fit ​​connector 40 fails due to long-term use or disassembly, only the snap-fit ​​connector 40 needs to be replaced, without the need to replace the ribbon drive shaft 31.

[0047] Optionally, the snap-fit ​​40 is integrated with the ribbon drive shaft 31 to facilitate the installation of the ribbon drive shaft 31. The integrated design reduces the number of parts. During actual assembly, the snap-fit ​​40 and the ribbon drive shaft 31 can be installed synchronously. The snap-fit ​​40 completes axial positioning at the same time as the ribbon drive shaft 31 is installed in place, further improving assembly efficiency.

[0048] like Figure 4As shown in the embodiment of this application, the snap-fit ​​member 40 includes a limiting part 41 and a snap-fit ​​part 42. In the axial direction of the mounting shaft 10, the limiting part 41 abuts against the ribbon drive shaft 31. Compared to the snap-fit ​​part 42, the limiting part 41 has a larger radial dimension, resulting in a larger contact area between the limiting part 41 and the ribbon drive shaft 31. This disperses the force between the limiting part 41 and the ribbon drive shaft 31, improves stress concentration, and reduces damage to the ribbon drive shaft 31 caused by the snap-fit ​​force. The snap-fit ​​mating part 110 engages with the snap-fit ​​part 42, wherein the snap-fit ​​part 42 is deformable to facilitate smooth engagement and locking with the snap-fit ​​mating part 110 during installation.

[0049] In some embodiments, the snap-fit ​​member 40 is provided with multiple snap-fit ​​portions 42. Compared with a ring-shaped snap-fit ​​structure, multiple discrete snap-fit ​​portions 42 are easier to deform, have less installation resistance, and allow users to more easily snap and release the snap-fit ​​member 40. All multiple snap-fit ​​portions 42 are integrally formed with the limiting portion 41, and the limiting portion 41 connects the multiple discrete snap-fit ​​portions 42 to ensure the rigidity of the overall structure.

[0050] Optionally, the snap-fit ​​component 40 includes multiple snap-fit ​​portions 42, which are evenly distributed around the circumference of the mounting shaft 10, so that the snap-fit ​​force is evenly distributed to multiple contact points around the circumference of the mounting shaft 10, reducing the risk of snap-fit ​​failure. The snap-fit ​​mating portion 110 of the mounting shaft 10 consists of multiple slots, which are evenly distributed around the circumference of the mounting shaft 10. The snap-fit ​​portion 42 includes a hook 421 and a snap-fit ​​body 422. The hooks 421 of the multiple snap-fit ​​portions 42 are correspondingly disposed in the multiple slots. The surface of the snap-fit ​​body 422 is fitted against the outer peripheral wall of the mounting shaft 10, and the snap-fit ​​component 40 and the snap-fit ​​mating portion 110 form a stable snap-fit ​​connection.

[0051] In some embodiments, the snap-fit ​​member 40 includes multiple snap-fit ​​portions 42, which are evenly distributed around the mounting shaft 10 in the circumference. This distributes the snap-fit ​​force evenly across multiple contact points around the mounting shaft 10, reducing the risk of snap-fit ​​failure. The snap-fit ​​mating portion 110 of the mounting shaft 10 is an annular groove. Each snap-fit ​​portion 42 includes a hook 421 and a snap-fit ​​body 422. The hooks 421 of the multiple snap-fit ​​portions 42 are all located in the annular groove. The surface of the snap-fit ​​body 422 is fitted against the outer peripheral wall of the mounting shaft 10, so that the snap-fit ​​member 40 and the snap-fit ​​mating portion 110 form a stable snap-fit ​​connection. With the snap-fit ​​mating portion 110 configured as an annular groove, circumferential alignment is not required during the installation of the snap-fit ​​member 40, further simplifying the installation process and improving assembly efficiency.

[0052] Understandably, the overall size of the snap-fit ​​component 40 is relatively small. Having too many snap-fit ​​portions 42 would result in each snap-fit ​​portion 42 being too small, making it susceptible to damage under stress and compromising snap-fit ​​stability. The snap-fit ​​component 40 includes two snap-fit ​​portions 42, symmetrically arranged about the mounting axis 10. This ensures that the force between the snap-fit ​​component 40 and the snap-fit ​​mating portion 110 is evenly distributed across the two snap-fit ​​portions 42, thereby improving localized stress concentration.

[0053] Please see Figures 6-7 Along the axial direction of the mounting shaft 10, the snap-fit ​​part 42 and the snap-fit ​​mating part 110 are spaced apart by a distance H, where H satisfies: 0.2mm ≤ H ≤ 1mm. By controlling the distance H to meet the above range, both the axial limiting of the ribbon drive shaft 31 and the smooth operation of the ribbon drive shaft 31 are taken into account. The gap between the snap-fit ​​part 42 and the snap-fit ​​mating part 110 provides axial free buffer space for the operation of the ribbon drive shaft 31, avoiding excessive tight limiting of the ribbon drive shaft 31 by the snap-fit ​​part 40, reducing the rotational resistance of the ribbon drive shaft 31, and contributing to the overall stability of the label printer 1. In addition, the appropriate spacing helps to improve the wear of components caused by long-term friction, thereby ensuring the long-term reliability of the ribbon drive shaft 31 and extending the service life of the label printer 1.

[0054] In specific implementations, when the snap-fit ​​component 40 is integrally arranged with the ribbon drive shaft 31, the snap-fit ​​portion 42 can be spaced apart from the snap-fit ​​mating portion 110, providing axial free buffer space for the operation of the ribbon drive shaft 31. When the snap-fit ​​component 40 and the ribbon drive shaft 31 are separately arranged, the snap-fit ​​portion 42 can be spaced apart from the snap-fit ​​mating portion 110, providing axial free buffer space for the operation of the ribbon drive shaft 31.

[0055] In some embodiments, the snap-fit ​​member 40 engages with the snap-fit ​​mating part 110 along the axial direction of the mounting shaft 10, and the carbon ribbon drive shaft 31 and the limiting part 41 of the snap-fit ​​member 40 are spaced apart, so that the carbon ribbon drive shaft 31 can move slightly along the axial direction of the mounting shaft 10, reducing the frictional resistance between the carbon ribbon drive shaft 31 and the snap-fit ​​member 40, thereby making the carbon ribbon drive shaft 31 rotate more smoothly.

[0056] In some embodiments, the ribbon drive shaft 31 has a guide hole 310 inside, through which the mounting shaft 10 passes. The snap-fit ​​member 40 includes a guide portion 43, which is sleeved on the mounting shaft 10, with a portion of the guide portion 43 located in the guide hole 310. Compared to the limiting portion 41, the guide portion 43 has a larger inner diameter, making it easier for the guide portion 43 to be sleeved on the mounting shaft 10, thereby ensuring the smooth installation of the snap-fit ​​member 40 on the mounting shaft 10. The guide portion 43 reduces the requirements for installation accuracy and further reduces assembly difficulty.

[0057] In some embodiments, the guide portion 43 and the carbon ribbon drive shaft 31 are spaced apart from each other by the wall surface of the guide hole 310, and the distance between them is D, where D satisfies 0.1mm≤D≤1mm. By setting a reasonable distance D, the direct contact area between the guide portion 43 and the carbon ribbon drive shaft 31 is reduced, thereby avoiding unnecessary frictional resistance on the carbon ribbon drive shaft 31 and ensuring the smooth rotation of the carbon ribbon drive shaft 31.

[0058] In some embodiments, the end of the mounting shaft 10 away from the carbon belt drive wheel assembly 20 has a guide surface 120, which is an inclined surface sloping towards the side where the carbon belt drive wheel assembly 20 is located. In actual assembly, the guide surface 120 makes it easier for the snap-fit ​​member 40 to be fitted onto the mounting shaft 10, and the snap-fit ​​member 40 can reach the preset position more smoothly under the guidance of the guide surface 120 to achieve a limiting engagement with the snap-fit ​​mating part 110.

[0059] In some embodiments, the ribbon drive shaft assembly 30 further includes a fixed shaft 32, a sleeve 33, and a connector 34. The fixed shaft 32 is coaxially sleeved on the mounting shaft 10 and rotatably mounted on the mounting shaft 10. The ribbon drive shaft 31 is mounted on one end of the fixed shaft 32, and the sleeve 33 is connected to the other end of the fixed shaft 32, so that the sleeve 33, the fixed shaft 32, and the ribbon drive shaft 31 can rotate synchronously. One end of the connector 34 is sleeved around the sleeve 33, and the other end is connected to the ribbon drive wheel assembly 20. Under the drive of the ribbon drive wheel assembly 20, the ribbon drive shaft 31 is driven to rotate around the mounting shaft 10 through the connector 34, the sleeve 33, and the fixed shaft 32.

[0060] In some embodiments, the label printer 1 further includes a bearing 35, which is sleeved on the mounting shaft 10 and located in the guide hole 310 of the ribbon drive shaft 31, connecting to the ribbon drive shaft 31. By providing the bearing 35, the resistance generated by friction is reduced, making the rotation of the ribbon drive shaft 31 relative to the mounting shaft 10 smoother, thereby improving rotational efficiency. Furthermore, the bearing 35 has a load-bearing and supporting function, enhancing the installation stability of the ribbon drive shaft 31 and helping to reduce component loosening or damage caused by vibration or impact.

[0061] In this embodiment, the label printer 1 further includes a ribbon cartridge 60, which includes a ribbon take-up shaft 61 and a ribbon unwind shaft 62. The ribbon take-up shaft 61 is used to take up the ribbon, and the ribbon unwind shaft 62 is used to unwind the ribbon. The ribbon take-up shaft 61 is coupled to the ribbon drive shaft 31, so that the ribbon drive wheel assembly 20 can drive the ribbon take-up shaft 61 to rotate through the ribbon drive shaft assembly 30. Optionally, the label printer 1 includes two sets of ribbon drive shaft assemblies 30, both sets of ribbon drive shaft assemblies 30 being coupled to the ribbon drive wheel assembly 20. The ribbon drive shaft 31 of one set of ribbon drive shaft assemblies 30 is coupled to the ribbon take-up shaft 61, and the ribbon drive shaft 31 of the other set of ribbon drive shaft assemblies 30 is coupled to the ribbon unwind shaft 62. The ribbon drive wheel assembly 20 can drive the ribbon take-up shaft 61 and the ribbon unwind shaft 62 to rotate in the same direction through the two sets of ribbon drive shaft assemblies 30, transferring the ribbon from the ribbon unwind shaft 62 to the ribbon take-up shaft 61 to complete the thermal transfer.

[0062] In label printer 1, the first preset speed output by the ribbon drive shaft assembly 30 is V1. Label printer 1 also includes a rubber roller assembly 70, which is used to drive the label paper to move along a preset direction at a second preset speed V2. The ribbon drive wheel assembly 20 is connected to the connector 34, and the connector 34 is slidably connected to the sleeve 33. Thus, when label printer 1 is printing, the connector 34 can slide relative to the ribbon drive shaft 31 so that the ribbon and the label paper move synchronously.

[0063] In this application, by setting the first preset speed V1 of the ribbon drive shaft assembly 30 to be greater than the second preset speed V2 of the roller assembly 70 (i.e., V1>V2), and utilizing the sliding compensation of the connector 34 when the ribbon is bonded to the label paper, the connector 34 can slide relative to the ribbon drive shaft 31 when the ribbon is bonded to the label paper through the sliding connection between the connector 34 and the sleeve 33. This dynamically adjusts the actual movement speed of the ribbon, allowing the ribbon to move synchronously with the label paper while maintaining a certain tension. Through the above-mentioned speed synchronization mechanism, the ribbon and the label paper always maintain a tight bond, reducing the relative sliding between them and avoiding problems such as ribbon wrinkling or poor printing effect caused by speed difference. In this application, the precise synchronization of the ribbon and the label paper is achieved through active speed control and mechanical compensation structure, improving the stability of printing quality.

[0064] Specifically, the connector 34 includes a first connecting segment and a second connecting segment. The first connecting segment is connected to the sleeve 33, and the second connecting segment is connected to the first connecting segment. The second connecting segment is circumferentially mounted on the sleeve 33 along the mounting shaft 10 so that when the carbon ribbon is attached to the label paper, the second connecting segment can slide relative to the sleeve 33 and the carbon ribbon drive shaft 31 along the circumferential direction of the mounting shaft 10.

[0065] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A label printer, characterized in that, include: Mounting shaft; A carbon belt drive wheel assembly is fitted onto the mounting shaft; A carbon ribbon drive shaft assembly includes a carbon ribbon drive shaft, which is sleeved on the mounting shaft and coupled to the carbon ribbon drive wheel assembly, so that the carbon ribbon drive shaft can drive the carbon ribbon to wind under the action of the carbon ribbon drive wheel assembly; and A snap-fit ​​element is provided at one end of the ribbon drive shaft away from the ribbon drive wheel assembly, in the axial direction of the mounting shaft, and the snap-fit ​​element is sleeved on the mounting shaft and snapped into the mounting shaft to limit the position of the ribbon drive shaft in the axial direction of the mounting shaft.

2. The label printer according to claim 1, characterized in that, The mounting shaft has a snap-fit ​​part, which snaps into the snap-fit ​​component. In the axial direction of the mounting shaft, the snap-fit ​​portion is located on the side of the carbon belt drive shaft away from the carbon belt drive wheel assembly.

3. The label printer according to claim 2, characterized in that, In the axial direction of the mounting shaft, the snap-fit ​​part is spaced apart from the carbon belt drive shaft, and the distance between them is L, where L satisfies: 2mm≤L≤5mm.

4. The label printer according to claim 1, characterized in that, The snap-fit ​​component is separately disposed from the carbon ribbon drive shaft.

5. The label printer according to claim 4, characterized in that, The snap-fit ​​component includes a limiting part and a snap-fit ​​part, and in the axial direction of the mounting shaft, the limiting part abuts against the ribbon drive shaft; The mounting shaft has a snap-fit ​​part, and the snap-fit ​​part engages with the snap-fit ​​part.

6. The label printer according to claim 5, characterized in that, The number of the latching parts is multiple, and all of the multiple latching parts are integrally formed with the limiting part.

7. The label printer according to claim 4, characterized in that, The carbon belt drive shaft has a guide through hole inside, and the mounting shaft passes through the guide through hole; The snap-fit ​​component includes a guide portion, which is sleeved on the mounting shaft, and a portion of the guide portion is disposed in the guide through hole.

8. The label printer according to claim 7, characterized in that, The guide portion and the carbon ribbon drive shaft define the wall surface of the guide through hole, which are spaced apart by a distance D, where D satisfies 0.1mm≤D≤1mm.

9. The label printer according to claim 1, characterized in that, The snap-fit ​​component is integrally formed with the carbon belt drive shaft.

10. The label printer according to claim 1, characterized in that, The end of the mounting shaft away from the carbon belt drive wheel assembly has a guide surface, which is an inclined surface that slopes toward the side where the carbon belt drive wheel assembly is located.

11. The label printer according to claim 1, characterized in that, The snap-fit ​​component includes multiple snap-fit ​​parts, which are evenly distributed circumferentially around the mounting shaft; The mounting shaft has a snap-fit ​​part, which is an annular groove. The snap-fit ​​part includes a snap hook and a snap-fit ​​body. The snap hooks of the multiple snap-fit ​​parts are all provided in the annular snap groove. The surface of the snap-fit ​​body is fitted to the outer peripheral wall of the mounting shaft.

12. The label printer according to claim 11, characterized in that, The snap-fit ​​component includes two snap-fit ​​portions, which are symmetrically arranged about the mounting axis.

13. The label printer according to claim 1, characterized in that, The snap-fit ​​component includes a snap-fit ​​portion, and the mounting shaft has a snap-fit ​​mating portion, wherein the snap-fit ​​portion snaps into the snap-fit ​​mating portion; Along the axial direction of the mounting shaft, the snap-fit ​​portion and the snap-fit ​​mating portion are spaced apart, and the distance is H, where H satisfies: 0.2mm≤H≤1mm.

14. The label printer according to claim 1, characterized in that, The carbon belt drive shaft has a guide hole inside; The label printer also includes a bearing, which is sleeved on the mounting shaft and located in the guide hole and connected to the ribbon drive shaft.

15. The label printer according to claim 14, characterized in that, The carbon belt drive shaft assembly also includes: A fixed shaft is coaxially sleeved on the mounting shaft and rotatably mounted on the mounting shaft, and the carbon belt drive shaft is mounted on one end of the fixed shaft; A sleeve is connected to the other end of the fixed shaft; The connector has one end sleeved around the outer periphery of the sleeve and the other end connected to the carbon belt drive wheel assembly. Under the drive of the carbon belt drive wheel assembly, the carbon belt drive shaft is rotated around the mounting shaft through the connector, the sleeve and the fixed shaft.

16. The label printer according to claim 1, characterized in that, The label printer also includes a ribbon cartridge, which includes a ribbon take-up spool and a ribbon unwind spool. The carbon ribbon take-up shaft is coupled to the carbon ribbon drive shaft.

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