Label printer

Abstract

The utility model discloses a label printer which comprises a printer body, a paper baffle assembly and a linkage assembly. The machine body comprises a paper bin. The paper blocking plate assembly comprises two paper blocking plates arranged in the first direction, and the bin depth direction of the paper bin is perpendicular to the first direction. The linkage assembly comprises a gear and two racks, the gear is rotationally connected with the machine body, the two racks are located on the two sides, in the bin depth direction of the paper bin, of the gear correspondingly, and the two racks are connected with the two paper blocking plates correspondingly and slidably connected with the machine body in the first direction; each rack comprises a first part and a second part which are arranged in the axial direction of the gear, each first part comprises a protruding part which extends in the first direction and protrudes out of the corresponding second part, the protruding parts and the second parts form receding notches, and one part of one rack is located in the receding notch of the other rack. The sliding block can slide in the first direction along the receding notch and go in and out of the receding notch. The label printer can adapt to fixation of paper tubes with more sizes, so that the applicability of the label printer is improved.

Description

Technical Field

[0001] This application relates to the field of label printing technology, and more particularly to a label printer. Background Technology

[0002] Labels refer to the text, graphic symbols, and all explanatory materials on a product. Labels are widely used in supermarkets, retail, industrial production, express delivery, clothing, office management, and other scenarios. A label printer is a device that can print labels from label paper onto other objects. The printer body has a paper tray containing a paper guide assembly to hold the paper tube. Label paper is wound onto the paper tube, and the multiple paper guides of the paper guide assembly form a clamping space to hold the paper tube.

[0003] In related technologies, paper baffles can usually only clamp paper tubes of a fixed size, which has poor applicability. Utility Model Content

[0004] This application provides a label printer that allows for a greater range of adjustment in the spacing between two guide plates, thereby accommodating the fixing of paper tubes of more sizes and improving the applicability of the label printer.

[0005] Specifically, a label printer includes:

[0006] The machine body has a paper tray;

[0007] A paper baffle assembly is located in the paper bin, the paper baffle assembly includes two paper baffles arranged along a first direction, and the depth direction of the paper bin is perpendicular to the first direction;

[0008] The linkage component includes a gear and two racks. The gear is rotatably connected to the machine body. The axial direction of the gear is perpendicular to the first direction and intersects the depth direction of the paper bin. The two racks are located on both sides of the gear along the depth direction of the paper bin. The two racks are connected to two guide plates and slidably connected to the machine body along the first direction. The racks cooperate with the gear so that when one guide plate slides along the first direction, it drives the other guide plate to slide along the first direction.

[0009] The rack includes a first portion and a second portion arranged along the axial direction of the gear. The first portion includes a protrusion extending along the first direction and protruding out of the second portion. The protrusion and the second portion form a clearance notch. A portion of one rack is located in the clearance notch of the other rack and can slide along the clearance notch in the first direction and enter and exit the clearance notch.

[0010] In some embodiments, the gear has a first tooth structure, the first portion having a second tooth structure extending along the first direction on one side facing the gear, the second tooth structure meshing with the first tooth structure; and the second portion having a third tooth structure extending along the first direction on one side facing the gear.

[0011] In some embodiments, along the axial direction of the gear, the second tooth structure includes a first overlapping portion that coincides with the third tooth structure, and the third tooth structure includes a second overlapping portion that coincides with the second tooth structure; wherein the dimension of the first tooth structure along the axial direction of the gear is D1, the dimension of the first overlapping portion along the axial direction of the gear is d1, the dimension of the second overlapping portion along the axial direction of the gear is d2, and (d1+d2)>D1.

[0012] In some embodiments, along the axial direction of the gear, the second tooth structure includes a first overlapping portion that coincides with the third tooth structure, and the third tooth structure includes a second overlapping portion that coincides with the second tooth structure, wherein the teeth on the first overlapping portion correspond one-to-one with and are connected to the teeth on the second overlapping portion.

[0013] In some embodiments, the gear has a first tooth structure, and the first portion has a second tooth structure extending along the first direction on one side facing the gear, the second tooth structure meshing with the first tooth structure; the side of the second portion facing the gear is a plane.

[0014] In some embodiments, a support shaft extending along the first direction is connected to the body, the rack includes a main body and a first sliding portion connected to the main body, the main body cooperates with the gear, the main body includes a first part and a second part, the first sliding portion and the clearance notch are respectively located at both ends of the main body arranged along the first direction; wherein, the support shaft passes through the clearance notch, the first sliding portion of one rack is located in the clearance notch of the other rack, the first sliding portion is slidably engaged with the support shaft so that the first sliding portion can slide along the clearance notch in the first direction and enter and exit the clearance notch.

[0015] In some embodiments, two support shafts are provided, arranged along a second direction perpendicular to the first direction, and the first sliding portions of the two racks are respectively slidably engaged with the two support shafts.

[0016] In some embodiments, the rack further includes a second sliding portion connected to the main body, the second sliding portion and the first sliding portion being located on opposite sides of the main body along the second direction; wherein the two racks are a first rack and a second rack, one support shaft passes sequentially through the first sliding portion of the first rack and the second sliding portion of the second rack, and the other support shaft passes sequentially through the first sliding portion of the second rack and the second sliding portion of the first rack.

[0017] In some embodiments, a support shaft is connected to the body, and the rack includes a main body and a second sliding part connected to the main body. The main body cooperates with the gear, and the main body includes a first part and a second part. The second sliding part is provided with a first through hole, and the support shaft passes through the first through hole so that the rack and the main body are slidably connected along the first direction.

[0018] In some embodiments, at least a portion of the wall of the first through hole has a first gap with the support shaft.

[0019] In some embodiments, the radial dimension of the first gap along the first through hole is d3, where 0.1 mm ≤ d3 ≤ 1 mm.

[0020] In some embodiments, the second sliding portion has an observation cavity, through which the support shaft passes; wherein, the second sliding portion is provided with an observation port communicating with the observation cavity.

[0021] In some embodiments, a plurality of ribs are provided on the inner wall of the observation cavity.

[0022] In some embodiments, a second gap exists between the rib and the support shaft.

[0023] In some embodiments, the body includes a peripheral side plate surrounding the paper compartment, the peripheral side plate including a back plate, and the baffle plate assembly, the back plate and the linkage assembly are arranged sequentially along the axial direction of the gear.

[0024] In some embodiments, the back plate is provided with a through-hole extending through the back plate, the through-hole extending along the first direction, and the baffle plate is connected to the rack through a connecting portion passing through the through-hole.

[0025] In some embodiments, a third gap is provided between the rack and the back plate.

[0026] In some embodiments, the dimension of the third clearance along the axial direction of the gear is d4, where 0.3 mm ≤ d4 ≤ 1.5 mm.

[0027] In some embodiments, the rack and the back plate are slidably connected along the first direction.

[0028] The beneficial effects of this application are as follows: the guide plate can slide along the first direction, so that the distance between the two guide plates can be adjusted according to the size of the paper tube, and the clearance notch can provide clearance space on the sliding path of the rack, so that the rack has a larger sliding range in the first direction, thereby making the distance between the two guide plates have a larger adjustment range, which can accommodate the fixing of more sizes of paper tubes, thereby further improving the applicability of the label printer; in addition, when one guide plate slides along the first direction, it drives the other guide plate to slide along the first direction, so that when the user uses the label printer, he only needs to slide any one guide plate to drive the other guide plate to slide, making the placement and fixing of the paper tube more convenient. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies 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.

[0030] Figure 1 This is a schematic diagram of the structure of a label printer in one embodiment of this application;

[0031] Figure 2 This is a partial structural diagram of a label printer in one embodiment of this application;

[0032] Figure 3 This is a structural schematic diagram of the backplate, baffle plate assembly, and linkage assembly from a first-view perspective in one embodiment of this application.

[0033] Figure 4 This is a structural schematic diagram of the backplate, baffle plate assembly, and linkage assembly from a second perspective in one embodiment of this application.

[0034] Figure 5 This is an exploded view of the back plate, baffle plate assembly, and linkage assembly in one embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the linkage component in one embodiment of this application;

[0036] Figure 7 This is an exploded view of the linkage component in one embodiment of this application;

[0037] Figure 8 This is a partial structural diagram of the linkage component in one embodiment of this application;

[0038] Figure 9 This is a structural schematic diagram of the back plate, baffle plate assembly, and linkage assembly from a third-person perspective in one embodiment of this application.

[0039] Figure label:

[0040] 10. Body; 11. Paper tray; 12. Peripheral side plate; 121. Back plate; 121a. Connecting port; 20. Paper baffle assembly; 21. Paper baffle; 22. Connecting part; 30. Linkage assembly; 40. Gear; 41. First tooth structure; 50. Rack; 51. Main body; 511. First part; 511a. Protrusion; 512. Second part; 513. Alignment notch; 52. Second tooth structure; 521. First overlapping part; 53. Third tooth structure; 531. Second overlapping part; 54. First sliding part; 55. Second sliding part; 551. First through hole; 552. Observation cavity; 553. Observation port; 554. Rib; 60. Support shaft. Detailed Implementation

[0041] 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.

[0042] This application provides a label printer to solve the problem in the related art that the paper stop assembly of the label printer can usually only clamp paper tubes of a fixed size, resulting in poor applicability.

[0043] like Figure 1 and Figure 2 As shown, the label printer includes a body 10 and a guide plate assembly 20. The body 10 has a paper tray 11 for holding a paper tube with label paper wound on it. The label paper can be printed onto other objects by a printing component (such as a print head) on the body 10. The guide plate assembly 20 is located in the paper tray 11 and includes two guide plates 21 arranged along a first direction XX. The depth direction YY of the paper tray 11 is perpendicular to the first direction XX. The guide plate assembly 20 is used to clamp and fix the paper tube placed in the paper tray 11. When using the label printer, the paper tube can be placed between the two guide plates 21 and the paper tube can be clamped and fixed by the two guide plates 21. At this time, the first direction XX is parallel to the axis of the paper tube.

[0044] It is understood that in this application, since the guide plate 21 can slide along the first direction XX, the distance between the two guide plates 21 can be adjusted according to the size of the paper tube, thereby accommodating the fixing of more paper tubes of different sizes, and thus improving the applicability of the label printer.

[0045] Specifically, the label printer also includes a linkage component 30, through which two guide plates 21 are connected, so that when one guide plate 21 slides along the first direction XX, it drives the other guide plate 21 to slide along the first direction XX. This allows the user to use the label printer by simply sliding either guide plate 21 to drive the other guide plate 21 to slide, making the placement and fixing of the paper tube more convenient.

[0046] More specifically, such as Figures 2 to 4 As shown, the linkage component 30 includes a gear 40 and two racks 50. The gear 40 is rotatably connected to the machine body 10. The axial direction ZZ of the gear 40 is perpendicular to the first direction XX, and the axial direction ZZ of the gear 40 intersects the depth direction YY of the paper bin 11. The axial direction ZZ of the gear 40 can be perpendicular to the depth direction YY of the paper bin 11 or form an angle with other angles. The two racks 50 are located on both sides of the gear 40 along the depth direction YY of the paper bin 11. The two racks 50 are connected to two baffle plates 21 respectively, and are slidably connected to the machine body 10 along the first direction XX. The racks 50 cooperate with the gear 40 so that when one baffle plate 21 slides along the first direction XX, it drives the other baffle plate 21 to slide along the first direction XX.

[0047] It is understandable that when one baffle plate 21 slides along the first direction XX, it can drive a rack 50 connected to it to slide along the first direction XX. Through the cooperation of the rack 50 and the gear 40, the gear 40 is driven to rotate. When the gear 40 rotates, it drives another rack 50 to slide along the first direction XX, which in turn drives another baffle plate 21 to slide along the first direction XX. This allows the two baffle plates 21 to slide towards each other or away from each other, thereby changing the distance between the two baffle plates 21.

[0048] like Figures 5 to 7 As shown, the rack 50 includes a first portion 511 and a second portion 512 arranged ZZ along the axial direction of the gear 40. The first portion 511 includes a protrusion 511a extending along the first direction XX and protruding out of the second portion 512. The protrusion 511a and the second portion 512 form a clearance notch 513. A portion of one rack 50 is located in the clearance notch 513 of the other rack 50 and can slide along the clearance notch 513 in the first direction XX and enter and exit the clearance notch 513.

[0049] Understandably, without the clearance notch 513, when one rack 50 slides to abut against the end of another rack 50, it will be blocked by the other rack 50. At this time, the sliding range of the rack 50 is L1. In this application, the clearance notch 513 can provide clearance space on the sliding path of the rack 50, so that the rack 50 has a larger sliding range in the first direction XX. The sliding range of the rack 50 in the clearance notch 513 is L2. At this time, the overall sliding range of the rack 50 is L1+L2, which makes the spacing between the two baffles 21 have a larger adjustment range, and thus can accommodate the fixing of more sizes of paper tubes, thereby further improving the applicability of the label printer.

[0050] In some embodiments of this application, the gear 40 has a first tooth structure 41, and the first part 511 has a second tooth structure 52 extending along a first direction XX on the side facing the gear 40. The second tooth structure 52 meshes with the first tooth structure 41, and the transmission between the rack 50 and the gear 40 can be realized through the meshing of the first tooth structure 41 and the second tooth structure 52.

[0051] In some embodiments, the second portion 512 has a third tooth structure 53 extending along the first direction XX on the side facing the gear 40, such that both the first portion 511 and the second portion 512 have tooth structures, and both the second tooth structure 52 and the third tooth structure 53 can mesh with the first tooth structure 41. When the gear 40 slides towards the third tooth structure 53 due to factors such as vibration or assembly, the meshing of the third tooth structure 53 with the first tooth structure 41 can still allow the rack 50 to slide smoothly, thereby improving the stability of the rack 50 when sliding, and thus improving the stability of the label printer when it is working.

[0052] In other embodiments, the side of the second portion 512 facing the gear 40 is flat, and no tooth structure is provided on the side of the second portion 512 facing the gear 40, which can reduce the overall volume and cost of the rack 50, thereby reducing the overall volume and cost of the label printer.

[0053] See also Figures 5 to 7 As shown, in some embodiments, the second portion 512 has a third tooth structure 53 extending along a first direction XX on the side facing the gear 40. In the axial direction ZZ of the gear 40, the second tooth structure 52 includes a first overlapping portion 521 that coincides with the third tooth structure 53, and the third tooth structure 53 includes a second overlapping portion 531 that coincides with the second tooth structure 52.

[0054] Wherein, the dimension of the first tooth structure 41 along the axial direction ZZ of the gear 40 is D1, the dimension of the first overlapping portion 521 along the axial direction ZZ of the gear 40 is d1, and the dimension of the second overlapping portion 531 along the axial direction ZZ of the gear 40 is d2, (d1+d2)>D1, so that the first tooth structure 41 on the gear 40 can fully mesh with the tooth structure on the rack 50, thereby making the engagement between the gear 40 and the rack 50 more stable, and thus allowing the rack 50 to slide smoothly. The specific values ​​of d1, d2, and D1 can be selected according to actual needs, and this application does not impose specific restrictions.

[0055] In some embodiments, the teeth on the first overlapping portion 521 correspond one-to-one with and are connected to the teeth on the second overlapping portion 531, such that the first overlapping portion 521 and the second overlapping portion 531 form a structure that extends continuously along the axial direction of the gear 40 (ZZ). This allows the first tooth structure 41 on the gear 40 to smoothly slide along the first overlapping portion 521 to the second overlapping portion 531 when the gear 40 slides towards the third tooth structure 53 due to vibration or assembly factors, thereby improving the stability of the rack 50 during sliding. The first tooth structure 41 and the second tooth structure 52 can be integrally formed or formed separately.

[0056] See Figures 4 to 7 As shown in some embodiments of this application, a support shaft 60 extending along a first direction XX is connected to the body 10. The rack 50 includes a main body 51 and a first sliding part 54 connected to the main body 51. The main body 51 cooperates with the gear 40. The main body 51 includes a first part 511 and a second part 512. The first sliding part 54 and the clearance notch 513 are respectively located at both ends of the main body 51 arranged along the first direction XX. The support shaft 60 passes through the clearance notch 513. The first sliding part 54 of one rack 50 is located in the clearance notch 513 of the other rack 50. The first sliding part 54 is slidably engaged with the support shaft 60 so that the first sliding part 54 can slide along the clearance notch 513 in the first direction XX and enter and exit the clearance notch 513.

[0057] It is understood that the axial direction of the support shaft 60 is parallel to the first direction XX. The rack 50 is slidably connected to the support shaft 60 through the first sliding part 54, thereby achieving a slidable connection with the body 10. The support shaft 60 provides a sliding limit for the rack 50, allowing the rack 50 to slide more stably and smoothly along the first direction XX. Furthermore, the clearance notch 513 provides clearance space for the first sliding part 54, giving the first sliding part 54 a larger sliding range, which in turn allows the rack 50 to have a larger sliding range. It should be noted that the first sliding part 54 can be provided with a through hole through which the support shaft 60 passes, achieving a slidable connection with the first sliding part 54; alternatively, the first sliding part 54 can be provided with an arc portion along the circumference of the support shaft 60, with the arc portion matching the outer surface of the support shaft 60, achieving a slidable connection with the support shaft 60.

[0058] In some embodiments, two support shafts 60 are provided, arranged along a second direction PP, which is perpendicular to the first direction XX. The first sliding portions 54 of the two racks 50 are respectively slidably engaged with the two support shafts 60, so that the two racks 50 are slidably connected to the machine body 10 through different support shafts 60, making the installation of the racks 50 more convenient. The second direction PP can be parallel to the depth direction YY of the paper tray 11, or it can be perpendicular to the depth direction YY of the paper tray 11 or form an angle with other directions.

[0059] Furthermore, the rack 50 also includes a second sliding part 55 connected to the main body 51. The second sliding part 55 and the first sliding part 54 are located on both sides of the main body 51 along the second direction PP, respectively. The two racks 50 are the first rack and the second rack, respectively. A support shaft 60 passes through the first sliding part 54 of the first rack and the second sliding part 55 of the second rack in sequence, and another support shaft 60 passes through the first sliding part 54 of the second rack and the second sliding part 55 of the first rack in sequence.

[0060] Understandably, by using two support shafts 60 to limit the two sides of a rack 50, the guide of the rack 50 becomes more stable, thus making the sliding of the rack 50 more stable and smooth. Furthermore, since one support shaft 60 provides limit for two racks 50 at the same time, the number of support shafts 60 can be reduced, thereby reducing the production cost of the label printer.

[0061] In some embodiments, the second sliding part 55 is provided with a first through hole 551, through which the support shaft 60 passes, so that the rack 50 and the main body 51 are slidably connected along the first direction XX, so that the rack 50 can slide more stably and smoothly along the first direction XX, and prevent the rack 50 from disengaging from the support shaft 60 due to factors such as vibration.

[0062] Furthermore, at least a portion of the wall of the first through hole 551 has a first gap with the support shaft 60 to reduce the contact area between the rack 50 and the wall of the first through hole 551, thereby reducing the friction between the rack 50 and the support shaft 60 when the rack 50 slides, reducing the resistance encountered by the rack 50 when it slides, and making the rack 50 slide more smoothly.

[0063] Furthermore, the radial dimension of the first gap along the first through hole 551 is d3, where 0.1 mm ≤ d3 ≤ 1 mm. When d3 is less than 0.1 mm, the friction between the rack 50 and the support shaft 60 is relatively large when the rack 50 slides, which can easily affect the sliding of the rack 50; when d3 is greater than 1 mm, the rack 50 is prone to wobbling, causing it to fail to mesh with the gear 40. Here, d3 can be 0.1 mm, 0.3 mm, 0.55 mm, 0.7 mm, 1 mm, or other dimensions.

[0064] like Figure 7 and Figure 8 As shown, in some embodiments, the second sliding part 55 has an observation cavity 552 through which the support shaft 60 passes. The second sliding part 55 is provided with an observation port 553 communicating with the observation cavity 552, so that the user can easily view the installation status of the support shaft 60 and the rack 50 through the observation port 553, making the connection between the support shaft 60 and the rack 50 more convenient.

[0065] The inner wall of the observation cavity 552 may be provided with multiple ribs 554 to improve the structural strength of the observation cavity 552 and prevent the second sliding part 55 from breaking at the observation cavity 552. The multiple ribs 554 may be arranged at intervals along the first direction XX, and there may be two, three or more ribs 554.

[0066] Furthermore, there is a second gap between the rib 554 and the support shaft 60, so that the support shaft 60 and the rib 554 are separated, preventing friction between the support shaft 60 and the rib 554 when the rack 50 slides, reducing the resistance encountered by the rack 50 when it slides, and making the rack 50 slide more smoothly.

[0067] See also Figure 1 and Figure 2 As shown, in some embodiments of this application, the body 10 includes a peripheral side plate 12 surrounding the paper bin 11. The peripheral side plate 12 includes a back plate 121. The baffle plate assembly 20, the back plate 121, and the linkage assembly 30 are arranged in sequence along the axial direction ZZ of the gear 40, so that the baffle plate assembly 20 and the linkage assembly 30 are located on both sides of the back plate 121, preventing the linkage assembly 30 from occupying the space inside the paper bin 11, so that the baffle plate 21 has a larger range of motion inside the paper bin 11, thereby accommodating more sizes of paper tubes.

[0068] Among them, such as Figure 3 and Figure 4As shown, a connecting port 121a is provided on the back plate 121, which extends through the back plate 121. The connecting port 121a extends along the first direction XX. The baffle plate 21 is connected to the rack 50 through the connecting part 22 passing through the connecting port 121a. The connecting port 121a can provide a connecting channel for the connecting part 22, and the connecting part 22 slides along the connecting port 121a along the first direction XX.

[0069] In some embodiments, the rack 50 is slidably connected to the back plate 121 along a first direction XX, thereby achieving a sliding connection between the rack 50 and the main body 51. Specifically, the support shaft 60 is mounted on the back plate 121, thereby achieving a sliding connection between the rack 50 and the back plate 121.

[0070] In some embodiments, the observation port 553 may be located on the side of the second sliding part 55 away from the paper tray 11, so that the user can view the installation status of the support shaft 60 and the rack 50 through the observation port 553.

[0071] like Figure 9 As shown, in some embodiments, a third gap is provided between the rack 50 and the back plate 121 to prevent the rack 50 from rubbing against the back plate 121 when it slides, reduce the resistance encountered by the rack 50 when it slides, and make the rack 50 slide more smoothly.

[0072] The dimension of the third clearance along the axial direction of gear 40 is d4, where 0.3 mm ≤ d4 ≤ 1.5 mm. When d4 is less than 0.3 mm, the rack 50 is prone to contact with the back plate 121 due to vibration during sliding, causing friction between the rack 50 and the back plate 121. When d4 is greater than 1.5 mm, the third clearance is too large, which will cause the volume of the body 10 to increase. d4 can be 0.3 mm, 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, or other dimensions.

[0073] 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: The machine body has a paper tray; A paper baffle assembly is located in the paper bin, the paper baffle assembly includes two paper baffles arranged along a first direction, and the depth direction of the paper bin is perpendicular to the first direction; The linkage component includes a gear and two racks. The gear is rotatably connected to the machine body. The axial direction of the gear is perpendicular to the first direction and intersects the depth direction of the paper bin. The two racks are located on both sides of the gear along the depth direction of the paper bin. The two racks are connected to two guide plates and slidably connected to the machine body along the first direction. The racks cooperate with the gear so that when one guide plate slides along the first direction, it drives the other guide plate to slide along the first direction. The rack includes a first portion and a second portion arranged along the axial direction of the gear. The first portion includes a protrusion extending along the first direction and protruding out of the second portion. The protrusion and the second portion form a clearance notch. A portion of one rack is located in the clearance notch of the other rack and can slide along the clearance notch in the first direction and enter and exit the clearance notch.

2. The label printer according to claim 1, characterized in that, The gear has a first tooth structure, and the first portion has a second tooth structure extending along the first direction on the side facing the gear, the second tooth structure meshing with the first tooth structure; the second portion has a third tooth structure extending along the first direction on the side facing the gear.

3. The label printer according to claim 2, characterized in that, In the axial direction of the gear, the second tooth structure includes a first overlapping portion that coincides with the third tooth structure, and the third tooth structure includes a second overlapping portion that coincides with the second tooth structure; Wherein, the dimension of the first tooth structure along the axial direction of the gear is D1, the dimension of the first overlapping portion along the axial direction of the gear is d1, the dimension of the second overlapping portion along the axial direction of the gear is d2, and (d1+d2)>D1.

4. The label printer according to claim 2, characterized in that, Along the axial direction of the gear, the second tooth structure includes a first overlapping portion that coincides with the third tooth structure, and the third tooth structure includes a second overlapping portion that coincides with the second tooth structure. The teeth on the first overlapping portion correspond one-to-one with the teeth on the second overlapping portion and are connected.

5. The label printer according to claim 1, characterized in that, The gear has a first tooth structure, and the first portion has a second tooth structure extending along the first direction on the side facing the gear, the second tooth structure meshing with the first tooth structure; the side of the second portion facing the gear is a plane.

6. The label printer according to claim 1, characterized in that, The body is connected to a support shaft extending along the first direction. The rack includes a main body and a first sliding part connected to the main body. The main body cooperates with the gear. The main body includes a first part and a second part. The first sliding part and the clearance notch are respectively located at both ends of the main body arranged along the first direction. The support shaft passes through the clearance notch, and the first sliding part of one rack is located in the clearance notch of the other rack. The first sliding part is slidably engaged with the support shaft so that the first sliding part can slide along the clearance notch in a first direction and enter and exit the clearance notch.

7. The label printer according to claim 6, characterized in that, Two support shafts are provided, and the two support shafts are arranged along a second direction, which is perpendicular to the first direction. The first sliding parts of the two racks are respectively slidably engaged with the two support shafts.

8. The label printer according to claim 7, characterized in that, The rack further includes a second sliding portion connected to the main body, and the second sliding portion and the first sliding portion are respectively located on both sides of the main body along the second direction; The two racks are a first rack and a second rack, and a support shaft passes through the first sliding part of the first rack and the second sliding part of the second rack in sequence, and the other support shaft passes through the first sliding part of the second rack and the second sliding part of the first rack in sequence.

9. The label printer according to claim 1, characterized in that, A support shaft is connected to the body, and the rack includes a main body and a second sliding part connected to the main body. The main body cooperates with the gear, and the main body includes a first part and a second part. The second sliding part is provided with a first through hole, and the support shaft passes through the first through hole so that the rack and the main body are slidably connected along the first direction.

10. The label printer according to claim 9, characterized in that, At least a portion of the wall of the first through hole has a first gap with the support shaft.

11. The label printer according to claim 10, characterized in that, The first gap has a radial dimension of d3 along the first through hole, where 0.1 mm ≤ d3 ≤ 1 mm.

12. The label printer according to claim 9, characterized in that, The second sliding part has an observation cavity, through which the support shaft passes; The second sliding part is provided with an observation port that communicates with the observation cavity.

13. The label printer according to claim 12, characterized in that, The inner wall of the observation cavity is provided with multiple ribs.

14. The label printer according to claim 13, characterized in that, There is a second gap between the rib and the support shaft.

15. The label printer according to claim 1, characterized in that, The machine body includes a peripheral side plate surrounding the paper compartment, the peripheral side plate including a back plate, and the baffle plate assembly, the back plate and the linkage assembly are arranged sequentially along the axial direction of the gear.

16. The label printer according to claim 15, characterized in that, The back plate is provided with a through-hole extending through the back plate, the through-hole extending along the first direction, and the baffle plate is connected to the rack through a connecting part passing through the through-hole.

17. The label printer according to claim 15, characterized in that, A third gap is provided between the rack and the back plate.

18. The label printer according to claim 17, characterized in that, The dimension of the third clearance along the axial direction of the gear is d4, where 0.3 mm ≤ d4 ≤ 1.5 mm.

19. The label printer according to claim 15, characterized in that, The rack and the back plate are slidably connected along the first direction.

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