Label printer

Abstract

This application provides a label printer, relating to the field of printing technology. The label printer of this application includes a printing component, a peeling component, and a transmission component. The transmission component can drive the printing component and the peeling component during paper feeding, and disengage them during paper ejection. During paper feeding, the printing roller rotates in the paper feeding direction, the label paper advances, the print head prints on the label, and simultaneously, the rotating printing roller drives the peeling roller to rotate. The peeling roller and the pressure roller together drive the backing paper forward, causing the label to peel off from the backing paper. During paper ejection, the printing roller rotates in the paper ejection direction, the transmission connection between the printing roller and the peeling roller is broken, and the peeling roller loses power. Because the peeling roller cannot actively drive the backing paper backward during paper ejection, but only serves to hold the backing paper, the backing paper can retreat in a taut position, avoiding the problem of the backing paper loosening or even piling up between the peeling roller and the printing roller, thus ensuring that the next label can be reliably peeled off.

Description

Technical Field

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

[0002] Label paper includes backing paper and multiple labels, which are affixed to the backing paper at intervals. A label printer is used to print images or text on the labels. In existing technology, label printers include a printing assembly and a peeling assembly. The printing assembly includes a cooperating print head and a print roller, while the peeling assembly includes a peeling element and a peeling roller. Along the direction of backing paper movement, the print roller, peeling element, and peeling roller are arranged sequentially. The peeling element changes the feed direction of the backing paper, and the peeling roller drives the backing paper. When the label printer is operating, the print roller drives the label paper forward, the print head prints preset content on the label surface, and the peeling roller drives the backing paper. Because the labels and backing paper move in different directions at the peeling element, the labels and backing paper separate. However, existing label printers suffer from unreliable peeling functionality. Summary of the Invention

[0003] The purpose of this application is to provide a label printer with a reliable peeling function that can improve the problem of loose or even accumulated backing paper between the printing roller and the peeling roller during paper ejection.

[0004] The embodiments of this application can be implemented as follows:

[0005] This application provides a label printer for printing preset content on labels of label paper. The printer includes a printing assembly, a peeling assembly, and a transmission assembly. The printing assembly includes a printing roller and a print head disposed opposite each other, with the printing roller driving the label paper to move. The peeling assembly includes a peeling roller and a pressure roller, which are tangentially engaged to hold the backing paper of the label paper. Along the forward direction of the backing paper, the peeling roller is located downstream of the printing roller. The transmission assembly is used to drive the printing roller and the peeling roller together when the printing roller rotates in the paper feeding direction, and to disconnect the drive connection between the printing roller and the peeling roller when the printing roller rotates in the paper retraction direction. The paper feeding direction is the direction that drives the label paper forward, and the paper retraction direction is the direction that drives the label paper backward.

[0006] In an optional embodiment, the transmission assembly includes a rocker arm and a transmission wheel. The first end of the rocker arm is sleeved on one end of the printing roller and is frictionally connected to the printing roller. The transmission wheel is disposed at the second end of the rocker arm and is drive-connected to the printing roller. When the printing roller rotates along the paper feeding direction, the printing roller drives the rocker arm to rotate along the first direction so that the transmission wheel is drive-connected to the peeling roller. When the transmission wheel is drive-connected to the peeling roller, the first end of the rocker arm slips relative to the printing roller. When the printing roller rotates along the paper ejection direction, the printing roller drives the rocker arm to rotate along the second direction so that the transmission wheel is separated from the peeling roller. The first direction and the second direction are opposite.

[0007] In an optional embodiment, the printing roller includes a printing mandrel and a printing rubber roller fixedly sleeved on the printing mandrel, with the printing head tangentially fitted to the printing rubber roller; the first end of the swing arm is provided with a core hole, which is sleeved with the printing mandrel, and the inner wall of the core hole is frictionally connected to the outer periphery of the printing mandrel.

[0008] In an optional embodiment, the printing roller includes a printing mandrel and a printing rubber roller fixedly sleeved on the printing mandrel. The printing head is tangentially fitted with the printing rubber roller, and a printing gear is fixedly sleeved on one end of the printing mandrel. The swing arm is frictionally connected to the end face of the printing gear.

[0009] In an optional embodiment, the transmission assembly further includes a first elastic element connected to the printing mandrel for applying pressure to the rocker arm to cause frictional connection between the rocker arm and the end face of the printing gear.

[0010] In an optional embodiment, the first elastic element includes a compression spring sleeved on the printing mandrel; the transmission assembly further includes a first sleeve and a pin, the first sleeve sleeved on the printing mandrel and abutting against the first end of the compression spring, the first sleeve having at least two pin slots, and each pin slot having a different depth along the axial direction of the first sleeve, the pin being selectively located in one of the pin slots and inserted into the printing mandrel.

[0011] In an optional embodiment, the transmission assembly further includes a friction pad located between the printed gear and the rocker arm.

[0012] In an optional embodiment, the label printer further includes a retaining sleeve; the peeling roller includes a peeling mandrel and a peeling rubber roller fixedly sleeved on the peeling mandrel, the peeling rubber roller being tangentially engaged with the pressure roller for holding the backing paper; the peeling assembly further includes a first one-way bearing, the inner ring of the first one-way bearing being sleeved on the peeling mandrel, the outer ring of the first one-way bearing being inserted into the retaining sleeve, the first one-way bearing being used to prevent the peeling rubber roller from rotating when the backing paper retracts.

[0013] In an optional embodiment, the printing roller includes a printing gear, a printing mandrel, and a printing rubber roller fixedly sleeved on the printing mandrel. The printing gear is fixedly connected to one end of the printing mandrel, and the print head is tangentially engaged with the printing rubber roller. The transmission assembly includes a second one-way bearing, a rocker arm, a transition gear, and a second elastic element. The inner ring of the second one-way bearing is sleeved on the printing mandrel, and the outer ring of the second one-way bearing is inserted into the first end of the rocker arm. The transition gear is disposed at the second end of the rocker arm and meshes with the printing gear. The second elastic element is connected to the rocker arm to ensure that the rocker arm always has a tendency to rotate in the first direction. When the printing roller rotates in the paper feeding direction, the outer ring of the second one-way bearing slips against the inner ring of the second one-way bearing, and the second elastic element drives the rocker arm to rotate in the first direction so that the transition gear is connected to the peeling roller. When the printing roller rotates in the paper ejection direction, the outer ring of the second one-way bearing clamps against the inner ring of the second one-way bearing, driving the rocker arm to overcome the elastic force of the second elastic element and rotate in the second direction so that the transition gear is separated from the peeling roller. The first and second directions are opposite.

[0014] In an optional embodiment, the label printer further includes a base frame and a locking assembly. The peeling assembly also includes a peeling bracket, which is pivotally connected to the base frame so that the peeling bracket can be opened or closed relative to the base frame by rotation. A peeling roller is disposed on the base frame, and a pressure roller is disposed on the peeling bracket. When the peeling bracket is closed relative to the base frame, the pressure roller is tangentially engaged with the peeling roller. When the peeling bracket is open relative to the base frame, the pressure roller is separated from the peeling roller. When the peeling bracket is closed relative to the base frame, the locking assembly is used to lock the position of the peeling bracket.

[0015] The beneficial effects of the embodiments of this application include:

[0016] The label printer provided in this application is used to print preset content on labels on label paper. It includes a printing component, a peeling component, and a transmission component. The printing component includes a printing roller and a print head arranged opposite each other, with the printing roller driving the label paper to move. The peeling component includes a peeling roller and a pressure roller, which are tangentially fitted to hold the backing paper of the label paper. Along the forward direction of the backing paper, the peeling roller is located downstream of the printing roller. The transmission component connects the printing roller and the peeling roller when the printing roller rotates along the paper feeding direction, and disconnects the connection when the printing roller rotates along the paper retraction direction. The paper feeding direction is the direction that drives the label paper forward, and the paper retraction direction is the direction that drives the label paper backward. When the label printer provided in this application prints labels, the printing roller rotates along the paper feeding direction, driving the label paper (including the backing paper and multiple labels pasted on the backing paper) forward. The print head prints on the labels. Simultaneously, the transmission component connects the printing roller and the peeling roller, allowing the rotating printing roller to drive the peeling roller to rotate. The peeling roller and the pressure roller together drive the backing paper forward, peeling the labels off the backing paper. During paper ejection, the printing roller rotates in the ejection direction, driving the label paper backward. The transmission assembly disconnects the transmission connection between the printing roller and the peeling roller, causing the peeling roller to lose power and thus unable to actively drive the backing paper. Because the peeling roller cannot actively drive the backing paper backward during ejection, but only clamps it, the backing paper can retreat in a taut position, avoiding the problem of loosening or even piling up between the peeling roller and the printing roller. This ensures that the next label can be reliably peeled off, making the peeling function reliable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the label printer with the peeling bracket closed in one embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the label printer with the peeling bracket open in one embodiment of this application;

[0020] Figure 3 This is a cross-sectional view of a label printer in one embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the transmission connection of the printing component, the transmission component, and the stripping component in one embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the assembly of the peeling bracket and the pressure roller in one embodiment of this application;

[0023] Figure 6 This is an exploded view of the peeling bracket and pressure roller in one embodiment of this application;

[0024] Figure 7 This is a cross-sectional view of the peeling bracket and pressure roller in one embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the transmission connection between the transmission component and the stripping component in one embodiment of this application;

[0026] Figure 9 This is a schematic diagram showing the disconnection of the transmission assembly and the stripping assembly in one embodiment of this application;

[0027] Figure 10 This is a partial exploded view of the transmission assembly and printing roller in one embodiment of this application;

[0028] Figure 11 This is a partial exploded view of the transmission assembly and printing roller in another embodiment of this application.

[0029] Icons: 010 - Label printer; 020 - Label paper; 100 - Housing; 110 - Paper output port; 200 - Printing assembly; 210 - Printing roller; 211 - Printing spindle; 212 - Printing rubber roller; 213 - Printing gear; 220 - Print head; 230 - Motor gear; 231 - First transmission gear; 232 - Second transmission gear; 300 - Peeling assembly; 310 - Peeling component; 320 - Peeling roller; 321 - Peeling rubber roller; 322 - Peeling spindle; 323 - Peeling gear; 324 - First one-way bearing; 330 - Pressure roller; 331 - Support shaft ; 332-Roller; 333-Pressure roller spring; 340-Peeling bracket; 341-Connecting arm; 342-Receiving groove; 350-Locking assembly; 351-Locking element; 352-Locking spring; 400-Transmission assembly; 410-Swing rod; 411-Core hole; 412-Mounting shaft; 420-Transition gear; 430-First elastic element; 440-First sleeve; 441-Pin groove; 450-Second sleeve; 460-Pin; 470-Second elastic element; 480-Second one-way bearing; 500-Side wall; 510-Fixing sleeve; 520-Limiting part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, 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, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0036] The inventors discovered that for labels to be reliably peeled off, the backing paper typically needs to be taut during its movement. Therefore, existing label printers usually set the linear speed of the peeling roller to be greater than that of the printing roller. This keeps the backing paper taut between the printing and peeling rollers during printing, facilitating label peeling. When the first label separates from the backing paper at the peeling point, the second label on the label paper has already passed the print head and is approaching the peeling point. To print the preset content on the second label, a paper ejection action is required. The printing roller drives the label paper (including the backing paper and the second label) backward, aligning the printed position of the second label with the print head. However, the inventors also discovered that during paper ejection, because the speed at which the peeling roller drives the backing paper is greater than that driven by the printing roller, the backing paper becomes loose between the printing and peeling rollers, sometimes even accumulating between them. Therefore, after the label printer finishes printing the second label, due to the loose backing paper, the second label cannot be reliably peeled off at the peeling point. To address this issue, the inventors have provided the label printer described in this application, which avoids the problem of loose or even accumulated backing paper between the peeling roller and the printing roller, ensuring that each label can be reliably peeled off, and that the peeling function is reliable.

[0037] Figure 1 This is a schematic diagram of the label printer 010 in one embodiment of this application when the peeling bracket 340 is closed; Figure 2 This is a schematic diagram of the label printer 010 in one embodiment of this application when the peeling bracket 340 is opened; Figure 3 This is a cross-sectional view of a label printer 010 in one embodiment of this application. Please refer to... Figures 1 to 3The label printer 010 provided in this embodiment includes a housing 100 and a printing component 200, a peeling component 300, and a transmission component 400 disposed within the housing 100. The label printer 010 provided in this application is used to print preset content on label paper 020. The label paper 020 includes backing paper and multiple labels pasted on the backing paper. The label printer 010 can print the preset content on the labels and then separate the labels from the backing paper, so that the user obtains a label with the backing paper removed and the preset content printed on it. The printing component 200 is used to feed the label paper 020 and print the preset content on the labels; the peeling component 300 is used to feed the backing paper and separate the labels from the backing paper. The transmission component 400 is used to selectively drive the printing component 200 and the peeling component 300, so that the printing component 200 can drive the peeling component 300 to move when feeding paper and disengage from the peeling component 300 when retracting paper. In this embodiment, the label paper 020 is contained within the housing 100 in a wound state. The printing component 200 prints on the released label paper 020 while simultaneously feeding the label paper. As printing proceeds, the wound label paper 020 is continuously released. It should be understood that in a normal printing process, the label paper 020 is first printed by the printing component 200, and then the peeling component 300 separates the backing paper and the label. During paper feeding, the label paper 020 is fed from the printing position to the position where the backing paper is peeled off. During paper ejection, the label paper 020 is fed in the opposite direction to the feeding direction. That is, the feeding direction of the label paper 020 includes both the feeding direction and the ejection direction.

[0038] In this embodiment, the printing assembly 200 includes a printing roller 210 and a print head 220 disposed opposite to each other. The printing roller 210 drives the label paper 020 to move, and the print head 220 prints on the label paper 020. When the label printer 010 prints labels, the printing roller 210 rotates along the paper feeding direction, driving the label paper 020 (including backing paper and multiple labels pasted on the backing paper) forward, and the print head 220 prints preset content on the labels. When retracting the paper, the printing roller 210 rotates along the paper retraction direction, driving the label paper 020 backward. In this embodiment, the paper feeding direction of the printing roller 210 is the same as the rotation direction when the printing roller 210 drives the label paper 020 to move along the paper feeding direction; the paper retraction direction of the printing roller 210 is the same as the rotation direction when the printing roller 210 drives the label paper 020 to move along the paper retraction direction, and the paper feeding direction of the printing roller 210 is opposite to the paper retraction direction of the printing roller 210.

[0039] In this embodiment, the outer casing 100 is provided with a paper outlet 110. After the label is separated from the backing paper, the label can be sent out from the paper outlet 110. Optionally, a base frame is provided inside the outer casing 100, and the printing assembly 200 and the peeling assembly 300 are both mounted on the base frame.

[0040] Figure 4 This is a schematic diagram illustrating the transmission connection of the printing component 200, the transmission component 400, and the stripping component 300 in one embodiment of this application. Figure 3 and Figure 4 As shown, the printing roller 210 includes a printing mandrel 211 and a printing roller 212 fixedly sleeved on the printing mandrel 211. The printing roller 212 is tangentially fitted to the print head 220, and the transmission assembly 400 is drively connected to the printing mandrel 211. The tangential fit between the printing roller 212 and the print head 220 means that the gap between the print head 220 and the outer peripheral surface of the printing roller 212 is small or even touching. As the printing roller 210 rotates, it can drive the label paper 020 located between the print head 220 and the printing roller 212 to move. The print head 220 can print preset content on the label paper 020 (specifically, the label) supported by the printing roller 210. The transmission assembly 400 is connected to the printing spindle 211 in a transmission manner, meaning that when the printing spindle 211 rotates, it can drive the transmission assembly 400 to move. When the printing spindle 211 (i.e., the printing roller 210) rotates in the paper feeding direction, the transmission assembly 400 can drive the peeling assembly 300 to move, so that the peeling assembly 300 can feed the backing paper and separate the label from the backing paper. When the printing spindle 211 (i.e., the printing roller 210) rotates in the paper ejection direction, the transmission assembly 400 is disconnected from the peeling assembly 300 and cannot drive the peeling assembly 300 to move.

[0041] In this embodiment, the base frame includes two side walls 500 that are spaced apart from each other. Figure 4 (Only one is shown in the figure). Two sidewalls 500 are arranged at intervals relative to each other along the printing width. The printing spindle 211 is supported by the two sidewalls 500. The printing roller 212 is located between the two sidewalls 500. At least one end of the printing spindle 211 extends out of the sidewall 500 and can rotate relative to the sidewall 500. In this embodiment, the printing assembly 200 also includes a printing gear 213, which is fixedly sleeved on the end of the printing spindle 211, and the printing gear 213 and the printing roller 212 are located on different sides of the sidewall 500. The label printer 010 also includes a motor (not shown in the figure), which is driven by the printing gear 213, so that the motor can drive the printing roller 210 to rotate. In this embodiment, a motor gear 230 is provided on the output shaft of the motor. The motor gear 230, the first transmission gear 231, the second transmission gear 232 and the printing gear 213 mesh in sequence to realize the drive connection between the motor and the printing roller 210. The first transmission gear 231 and the second transmission gear 232 are rotatably connected to the sidewall 500. In other optional embodiments, the transmission connection between the motor and the printing roller 210 is not limited to the method described above. The motor gear 230 and the printing gear 213 can be directly meshed. Alternatively, the transmission between the motor and the printing roller 210 can be achieved by belt drive, chain drive, or other methods.

[0042] Figure 5 This is a schematic diagram of the assembly of the peeling bracket 340 and the pressure roller 330 in one embodiment of this application; Figure 6 This is an exploded view of the peeling bracket 340 and the pressure roller 330 in one embodiment of this application; Figure 7 This is a cross-sectional view of the peeling bracket 340 and the pressure roller 330 in one embodiment of this application. Please refer to... Figures 5 to 7 Referring to the foregoing figures, the peeling assembly 300 of this embodiment includes a peeling member 310 (see figure 310). Figure 3 The label 020 consists of a peeling roller 320, a pressure roller 330, and a peeling bracket 340. Along the paper feeding direction of the label 020, the peeling member 310 is located downstream of the printing roller 210, and the distance between the peeling member and the printing roller 210 is less than the length of the label along the moving direction. The peeling member 310 changes the feeding direction of the backing paper, while the label continues to move along the paper feeding direction under the drive of the printing roller 210, thus allowing the label and backing paper to separate at the peeling member 310. In this embodiment, the peeling member 310 is a plate extending along the printing width direction. Both ends of the peeling member 310 are supported by two side walls 500. After passing the peeling member 310, the moving direction of the backing paper changes downwards, reaching between the peeling roller 320 and the pressure roller 330. The peeling roller 320 and the pressure roller 330 are tangentially engaged to hold the backing paper and drive it forward. Along the forward direction of the backing paper, the peeling roller 320 is located downstream of the printing roller 210 and is mounted on the base frame. Specifically, both ends of the peeling roller 320 are supported by two side walls 500. The peeling bracket 340 is pivotally connected to the base frame and can be opened or closed relative to the base frame by rotation. The pressure roller 330 is mounted on the peeling bracket 340. When the peeling bracket 340 is closed relative to the base frame, it is located between the two side walls 500, and the pressure roller 330 is tangentially engaged with the peeling roller 320. When the peeling bracket 340 is open relative to the base frame, the pressure roller 330 separates from the peeling roller 320. In this embodiment, the peeling bracket 340 is provided with two connecting arms 341, and the peeling bracket 340 is pivotally connected to the two side walls 500 of the base frame via the two connecting arms 341.

[0043] It is understandable that when the peeling bracket 340 rotates to the closed position, the pressure roller 330 and the peeling roller 320 can jointly hold the backing paper, thus positioning the backing paper and guiding its movement direction. When the peeling bracket 340 rotates to the open position, the pressure roller 330 and the peeling roller 320 cannot hold the backing paper, and the user can perform related operations on the backing paper. In practical applications, when installing label paper 020 before printing, the end of the backing paper needs to be passed between the pressure roller 330 and the peeling roller 321. At this time, simply open the peeling bracket 340 relative to the base frame, pull out the backing paper and place it between the pressure roller 330 and the peeling roller 320, then close the peeling bracket 340 relative to the base frame, allowing the pressure roller 330 and the peeling roller 320 to hold the backing paper, thus completing the installation of label paper 020.

[0044] Optionally, the peeling roller 320 includes a peeling mandrel 322 and a peeling rubber roller 321 fixedly sleeved on the peeling mandrel 322. The peeling rubber roller 321 is tangentially fitted with the pressure roller 330, and both ends of the peeling mandrel 322 are rotatably connected to the base frame. In this embodiment, both ends of the peeling mandrel 322 are respectively inserted into two side walls 500, and the peeling mandrel 322 can rotate relative to the side walls 500. A peeling gear 323 is fixedly sleeved at the end of the peeling mandrel 322. The peeling gear 323 is used to cooperate with the transmission assembly 400, receive the power transmitted by the transmission assembly 400 and be driven to rotate, thereby driving the peeling roller 320 to rotate. Optionally, the pressure roller 330 includes a support shaft 331 and a roller 332 sleeved on the support shaft 331. Both ends of the support shaft 331 are pivotally connected to the peeling bracket 340, and the roller 332 of the pressure roller 330 and the peeling rubber roller 321 of the peeling roller 320 jointly clamp the backing paper.

[0045] Optionally, the label printer 010 also includes a locking assembly 350. When the peeling bracket 340 is closed relative to the base frame, the locking assembly 350 is used to lock the position of the peeling bracket 340 to ensure that the pressure roller 330 and the peeling roller 320 are tangentially engaged and reliably hold the backing paper. In this embodiment, the locking assembly 350 is disposed on one of the peeling bracket 340 and the base frame, and the other of the peeling bracket 340 and the base frame is provided with an insertion hole (not shown in the figure). The locking assembly 350 is movable and always has a tendency to engage with the insertion hole. When the peeling bracket 340 is closed relative to the base frame, a portion of the locking assembly 350 can engage with the insertion hole, preventing the peeling bracket 340 from opening relative to the base frame. Optionally, the locking assembly 350 includes a locking spring 352 and a locking member 351. Under the action of the locking spring 352, the locking member 351 always has a tendency to engage with the insertion hole.

[0046] In this embodiment, the label printer 010 includes two locking components 350, and the corresponding insertion holes of the two locking components 350 are respectively disposed on two side walls 500. Both locking components 350 are disposed on the peeling bracket 340. When the peeling bracket 340 is closed relative to the base frame, the locking members 351 of the two locking components 350 are respectively inserted into the two insertion holes, locking the position of the peeling bracket 340 from both ends, making the locking more reliable. Specifically, the peeling bracket 340 has receiving grooves 342 at both ends along the printing width direction. The two locking members 351 are respectively inserted into the receiving grooves 342 at both ends of the peeling bracket 340, and can slide along the printing width direction, so that their respective locking members 351 are inserted into or separated from the insertion holes on the side wall 500. Further, the locking spring 352 is a compression spring, one end of the locking spring 352 abuts against the bottom wall of the receiving groove 342, and the other end abuts against the locking member 351. The locking member 351 is inserted into the receiving groove 342, and under the action of the locking spring 352, it always has a tendency to slide out of the receiving groove 342.

[0047] It should be understood that when the locking member 351 is engaged with the socket, one end of the locking member 351 as a whole can be inserted into the socket, or the boss, post, or other structure on the locking member 351 can be inserted into the socket.

[0048] In this embodiment, the pressure roller 330 is movably connected to the peeling bracket 340. The peeling assembly 300 also includes a pressure roller spring 333, which is connected between the peeling bracket 340 and the pressure roller 330, allowing the pressure roller 330 to have a certain amount of floating on the peeling bracket 340. When the peeling bracket 340 is closed relative to the base frame, the pressure roller 330 can press against the peeling roller 320 with appropriate pressure under the push of the pressure roller spring 333. Even when the backing paper enters or exits between the pressure roller 330 and the peeling roller 320, or when the thickness of the backing paper changes, the floating amount of the pressure roller 330 can adapt to the change in distance between the pressure roller 330 and the peeling roller 320, keeping the pressure change within a small range, thereby improving printing stability. Optionally, the pressure roller spring 333 is a compression spring.

[0049] The transmission assembly 400 is used to drive the printing roller 210 and the peeling roller 320 together when the printing roller 210 rotates in the paper feeding direction, and to disconnect the drive connection between the printing roller 210 and the peeling roller 320 when the printing roller 210 rotates in the paper ejection direction. The paper feeding direction of the printing roller 210 is the rotation direction when the printing roller 210 drives the label paper 020 forward, and the paper ejection direction of the printing roller 210 is the rotation direction when the printing roller 210 drives the label paper 020 backward. When the label printer 010 prints a label, the printing roller 210 rotates in the paper feeding direction, driving the label paper 020 forward. The print head 220 prints the preset content on the label. At the same time, the transmission assembly 400 connects the printing roller 210 and the peeling roller 320, so that the rotating printing roller 210 can drive the peeling roller 320 to rotate. The peeling roller 320 and the pressure roller 330 jointly drive the backing paper forward. When the printing roller 210 drives the label paper 020 to the peeling member 310, the label is peeled off from the backing paper. When the paper is ejected, the printing roller 210 rotates in the paper ejection direction, driving the label paper 020 backward. The transmission assembly 400 disconnects the transmission connection between the printing roller 210 and the peeling roller 320, so the peeling roller 320 has no power and cannot actively drive the backing paper to move. Since the peeling roller 320 is a passively rotating (or not rotating) roller during paper ejection, it cannot actively drive the backing paper backward and only serves to hold the backing paper. The backing paper is pulled by the printing roller 210, so the backing paper can retreat in a taut posture, avoiding the problem of the backing paper being loose or even piling up between the peeling roller 320 and the printing roller 210. Because the backing paper between the peeling roller 320 and the printing roller 210 is tight, when the label printer 010 starts printing the next label, the printing roller 210 and the peeling roller 320 can drive the label paper 020 and the backing paper forward respectively, ensuring that the label can be reliably peeled off.

[0050] Figure 8 This is a schematic diagram of the transmission connection between the transmission assembly 400 and the stripping assembly 300 in one embodiment of this application; Figure 9 This is a schematic diagram showing the transmission assembly 400 and the stripping assembly 300 disconnected in one embodiment of this application. Please refer to... Figure 8 , Figure 9 and combined Figure 4The transmission assembly 400 includes a rocker arm 410 and a transmission wheel. The first end of the rocker arm 410 is sleeved on one end of the printing roller 210 and is frictionally connected to the printing roller 210. The transmission wheel is disposed at the second end of the rocker arm 410 and is drive-connected to the printing roller 210. When the printing roller 210 rotates in the paper feeding direction, the printing roller 210 drives the rocker arm 410 to rotate in the first direction so that the transmission wheel is drive-connected to the peeling roller 320. When the transmission wheel is drive-connected to the peeling roller 320, the first end of the rocker arm 410 slips relative to the printing roller 210. When the printing roller 210 rotates in the paper ejection direction, the printing roller 210 drives the rocker arm 410 to rotate in the second direction so that the transmission wheel is separated from the peeling roller 320. The first direction and the second direction are opposite.

[0051] In this embodiment, the first end of the swing arm 410 is sleeved on the printing core shaft 211, and the swing arm 410 and the printing core shaft 211 are in frictional connection. When the printing roller 210 rotates, the friction between the printing core shaft 211 and the swing arm 410 can drive the swing arm 410 to rotate. This friction is set to be less than the resistance of the peeling roller 320 to the drive wheel. Therefore, when the drive wheel is connected to the peeling roller 320, the swing arm 410 and the printing core shaft 211 slip relative to each other. This arrangement allows the peeling roller 320 to drive the backing paper as the active roller during paper feeding, increasing the driving force on the backing paper and ensuring that the label can reliably separate from the backing paper when the label paper 020 passes through the peeling member 310. During paper ejection, the peeling roller 320 loses power and cannot drive the liner as an active roller. Therefore, the peeling roller 320 and the pressure roller 330 cannot provide power to the liner. The two together hold the liner, and under the drive of the printing roller 210, the liner is pulled back in a taut state, which avoids the liner from becoming loose or even piling up between the printing roller 210 and the peeling roller 320, thus ensuring that the next label is reliably peeled off.

[0052] Optionally, the first end of the rocker arm 410 is provided with a core hole 411, which is sleeved with the printing spindle 211. The inner wall of the core hole 411 is in frictional connection with the outer periphery of the printing spindle 211. That is, there is a first frictional force between the inner wall of the core hole 411 and the outer periphery of the printing spindle 211. When the resistance to the rotation of the rocker arm 410 is greater than the first frictional force, the core hole 411 and the printing spindle 211 slip relative to each other, so that the printing spindle 211 cannot drive the rocker arm 410 to rotate.

[0053] In this embodiment, the transmission wheel of the transmission assembly 400 includes a transition gear 420, which meshes with the printing gear 213. When the printing roller 210 rotates along the paper feeding direction, the friction between the printing core shaft 211 and the core hole 411 drives the swing arm 410 to rotate along the first direction, causing the transition gear 420 to mesh with the peeling gear 323. The swing arm 410 is obstructed, and the core hole 411 slips relative to the printing core shaft 211, stopping the swing arm 410 from rotating further along the first direction. The printing roller 210 drives the peeling roller 320 to rotate through the sequentially meshed printing gear 213, transition gear 420, and peeling gear 323. When the printing roller 210 rotates along the paper ejection direction, the friction between the printing core shaft 211 and the core hole 411 drives the swing arm 410 to rotate along the second direction, causing the transition gear 420 to separate from the peeling gear 323. The swing arm 410 then interacts with the limiting part 520 on the base frame (see...). Figure 4 When the core hole 411 and the printing core shaft 211 are contacted, the core hole 411 slips relative to each other, and the rocker arm 410 stops rotating in the second direction. In other embodiments, the transmission wheel may also include a pulley and a transition gear 420 coaxially fixedly connected. The printing core shaft 211 is fixed with a printing gear 213 and a printing pulley. The transmission assembly 400 also includes a transmission belt, which is sleeved on the printing pulley and the pulley. Using a transmission belt, a longer rocker arm 410 can be set, which is beneficial for the use of structures of different sizes.

[0054] In addition to utilizing the friction between the core hole 411 of the swing arm 410 and the printing mandrel 211 to achieve frictional connection, in other optional embodiments, the swing arm 410 can also be frictionally connected to the end face of the printing gear 213. Specifically, the swing arm 410 has a plate-like structure with a first surface and a second surface spaced apart along the plate thickness direction. The first end of the swing arm 410 is provided with a core hole 411 penetrating the first surface and the second surface. The inner diameter of the core hole 411 is larger than the diameter of the printing mandrel 211. The core hole 411 is sleeved with the printing mandrel 211. The first surface is frictionally connected to the end face of the printing gear 213, and there is a second frictional force between them. When the printing gear 213 rotates, the second frictional force can drive the swing arm 410 to rotate accordingly. When the resistance to the rotation of the swing arm 410 is greater than the second frictional force, the first surface of the swing arm 410 slips relative to the end face of the printing gear 213, and the swing arm 410 will not be driven by the printing gear 213 to continue rotating.

[0055] Figure 10 This is a partial exploded view of the transmission assembly 400 and the printing roller 210 in one embodiment of this application. Figure 10 As shown, the transmission assembly 400 also includes a first elastic element 430, which is connected to the printing mandrel 211 and is used to apply pressure to the rocker arm 410, causing frictional connection between the rocker arm 410 and the end face of the printing gear 213. Optionally, the first elastic element 430 is a compression spring, which is sleeved on the printing mandrel 211. Figure 10In the illustrated embodiment, the transmission assembly 400 further includes a first sleeve 440 and a pin 460. The first sleeve 440 is sleeved on the printing mandrel 211 and abuts against the first end of the compression spring. The first sleeve 440 has at least two pin grooves 441, and the depth of each pin groove 441 along the axial direction of the first sleeve 440 is different. The pin 460 is selectively located in one of the pin grooves 441 and is inserted into the printing mandrel 211. By cooperating with the pin groove 441, the printing mandrel 211, and the first elastic member 430, the pin 460 can lock the first sleeve 440 to its extreme position on the printing mandrel 211 in the direction away from the rocker arm 410. In this embodiment, the pin groove 441 extends from the end of the first sleeve 440 away from the rocker arm 410 to the end of the first sleeve 440 near the rocker arm 410. Since the depth of each pin groove 441 in the axial direction of the first sleeve 440 is different, by placing the pin 460 in different pin grooves 441, the position of the first sleeve 440 along the axial direction of the printing core shaft 211 can be adjusted, so that the deformation of the compression spring is different, the pressure applied by the compression spring to the rocker arm 410 is adjusted, and thus the friction between the rocker arm 410 and the printing gear 213 is adjusted.

[0056] Optionally, the transmission assembly 400 further includes a second sleeve 450, which is sleeved on the printing mandrel 211 and can slide axially relative to the printing mandrel 211. The second sleeve 450 abuts against the second end of the compression spring, the first surface of the rocker arm 410 abuts against the end face of the printing gear 213, and the second surface of the rocker arm 410 abuts against the bottom surface of the second sleeve 450. This creates a frictional connection between the second sleeve 450 and the rocker arm 410, thereby further increasing the frictional force on the rocker arm 410. Simultaneously, the two ends of the compression spring are located at the first sleeve 440 and the second sleeve 450, respectively. The first sleeve 440 and the second sleeve 450 also protect the compression spring, preventing foreign objects from entering between the spring wires and affecting the pressure applied by the compression spring to the rocker arm 410.

[0057] In another optional embodiment, the printing mandrel 211 is further provided with a limiting member, optionally a retaining ring. The printing gear 213, the rocker arm 410, the compression spring, and the retaining ring are arranged sequentially along the printing mandrel 211. The first surface of the rocker arm 410 abuts against the end face of the printing gear 213, the first end of the compression spring abuts against the retaining ring, and the second end of the compression spring abuts against the second surface of the rocker arm 410. The pressure of the compression spring causes the first surface of the rocker arm 410 to abut against the end face of the printing gear 213 with a set pressure, so that the first surface of the rocker arm 410 and the end face of the printing gear 213 are in surface contact and generate friction. In another optional embodiment, the printing gear 213, the rocker arm 410, and the retaining ring are arranged sequentially along the printing mandrel 211, and the position of the rocker arm 410 is limited by the retaining ring, so that friction is generated between the rocker arm 410 and the end face of the printing gear 213. In another optional embodiment, the first elastic member 430 is a rubber cotton.

[0058] In an optional embodiment, the transmission assembly 400 further includes a friction pad (not shown) located between the printing gear 213 and the swing arm 410. Optionally, the friction pad is made of felt. By adding the friction pad, two friction surfaces are formed between the first surface of the swing arm 410 and the friction pad, and between the friction pad and the end face of the printing gear 213, thereby increasing the friction force on the swing arm 410 and facilitating the swing arm 410 to swing under the influence of the printing roller 210.

[0059] Please refer to it again. Figure 3 Optionally, the base frame also includes a fixing sleeve 510, and the peeling assembly 300 also includes a first one-way bearing 324. The inner ring of the first one-way bearing 324 is sleeved on and fixed to the peeling mandrel 322, and the outer ring of the first one-way bearing 324 is inserted into and fixed to the fixing sleeve 510. The first one-way bearing 324 is used to prevent the peeling roller 321 from rotating when the backing paper retracts. When the printing roller 210 rotates in the paper feeding direction, the transition gear 420 meshes with the peeling gear 323, driving the peeling roller 320 to rotate through the printing gear 213, the transition gear 420, and the peeling gear 323. The peeling mandrel 322 drives the inner ring of the first one-way bearing 324 to rotate, causing the inner and outer rings of the first one-way bearing 324 to slip. The rotation of the peeling mandrel 322 drives the peeling roller 321 to rotate, and the peeling roller 321 and the pressure roller 330 jointly drive the backing paper forward. When the printing roller 210 rotates in the paper ejection direction, the transition gear 420 separates from the peeling gear 323, and the liner paper is pulled back by the printing roller 210. The liner paper drives the peeling roller 320 to rotate in the opposite direction, and the peeling mandrel 322 drives the inner ring of the first one-way bearing 324 to rotate in the opposite direction, so that the inner ring and outer ring of the first one-way bearing 324 are tightly locked, preventing the peeling mandrel 322 from rotating. The peeling roller 321 does not rotate, and the liner paper slides relative to the peeling roller 321, further ensuring that the liner paper between the peeling roller 321 and the printing roller 212 remains taut, and more effectively avoiding the problem of the liner paper becoming loose or even piling up during the paper ejection process. In other embodiments, if the first one-way bearing 324 is not used, then during the paper ejection process, the peeling roller 320 and the pressure roller 330 act as driven rollers and are driven to rotate by the liner paper.

[0060] Figure 11 This is a partial exploded view of the transmission assembly 400 and the printing roller 210 in another embodiment of this application. Figure 11As shown, in this embodiment, the transmission assembly 400 includes a second one-way bearing 480, a rocker arm 410, a transition gear 420, and a second elastic element 470. The inner ring of the second one-way bearing 480 is sleeved on the printing mandrel 211 and fixed to it. The outer ring of the second one-way bearing 480 is inserted into the first end of the rocker arm 410 and fixed to it. The transition gear 420 is rotatably connected to the second end of the rocker arm 410 via a mounting shaft 412 and meshes with the printing gear 213. The second elastic element 470 is connected to the rocker arm 410 to ensure that the rocker arm 410 always has a tendency to rotate in the first direction (i.e., tends to engage the transmission assembly 400 with the stripping assembly 300). Optionally, the second elastic element 470 is a tension spring, with its first end connected to the base frame and its second end connected to the rocker arm 410. Under the tension of the tension spring, the rocker arm 410 always has a tendency to rotate in the first direction. When the printing roller 210 rotates in the paper feeding direction, the printing spindle 211 drives the inner ring of the second one-way bearing 480 to rotate. The inner and outer rings of the second one-way bearing 480 slip, and the second elastic element 470 drives the rocker arm 410 to rotate in the first direction, so that the printing gear 213 is connected to the peeling roller 320 through the transition gear 420. When the printing roller 210 rotates in the paper ejection direction, it drives the first unprinted label on the label paper 020 to retract below the print head 220. At the same time, the printing spindle 211 drives the inner ring of the second one-way bearing 480 to rotate in the opposite direction. The inner and outer rings of the second one-way bearing 480 clamp together, causing the second one-way bearing 480 to rotate accordingly. The outer ring of the second one-way bearing 480 drives the rocker arm 410 to overcome the tension of the second elastic element 470 and rotate in the second direction, so that the transition gear 420 separates from the peeling roller 320. The first and second directions are opposite. In other optional embodiments, the second elastic element 470 can also be a compression spring or a torsion spring.

[0061] Figure 11 The illustrated embodiments and Figure 10 The principle driving the rocker arm 410 to rotate differs in the embodiments shown. Specifically, when the printing roller 210 rotates along the paper feeding direction, Figure 11 In the illustrated embodiment, the transmission connection is disconnected by utilizing the one-way transmission function of the second one-way bearing 480. The rocker arm 410 rotates in the first direction under the elastic force of the second elastic element 470, thereby causing the transition gear 420 to mesh with the stripping gear 323. Figure 10 In the illustrated embodiment, the rocker arm 410 is driven to rotate in the first direction by friction. When the printing roller 210 rotates in the paper ejection direction, Figure 11 In the illustrated embodiment, relying on the unidirectional rotation characteristic of the second one-way bearing 480, the outer and inner rings of the second one-way bearing 480 are engaged (rotating synchronously), allowing the rocker arm 410 to rotate in the second direction against the elastic force of the second elastic member 470, thereby disengaging the transition gear 420 from the release gear 323. Figure 10 In this embodiment, the pendulum 410 is still driven to rotate in the second direction by friction.

[0062] In summary, the label printer 010 provided in this application embodiment includes a printing component 200, a peeling component 300, and a transmission component. The printing component 200 includes a printing roller 210 and a print head 220 disposed opposite to each other. The printing roller 210 is used to drive the label paper 020 to move. The peeling component 300 includes a peeling roller 320 and a pressure roller 330. The peeling roller 320 and the pressure roller 330 are tangentially fitted to hold the backing paper of the label paper 020. Along the forward direction of the backing paper, the peeling roller 320 is located downstream of the printing roller 210. The transmission component 400 is used to drive the printing roller 210 and the peeling roller 320 together when the printing roller 210 rotates along the paper feeding direction, and to disconnect the drive connection between the printing roller 210 and the peeling roller 320 when the printing roller 210 rotates along the paper ejection direction. The paper feeding direction is the rotation direction in which the printing roller 210 drives the label paper 020 forward, and the paper ejection direction is the rotation direction in which the printing roller 210 drives the label paper 020 backward. When the label printer 010 provided in this application prints labels, the printing roller 210 rotates in the paper feeding direction, driving the label paper 020 (including backing paper and multiple labels pasted on the backing paper) forward. The print head 220 prints preset content on the labels. Simultaneously, the transmission assembly 400 connects the printing roller 210 and the peeling roller 320, enabling the rotating printing roller 210 to drive the peeling roller 320 to rotate. The peeling roller 320 and the pressure roller 330 together drive the backing paper forward, peeling the labels off the backing paper. During paper ejection, the printing roller 210 rotates in the paper ejection direction, driving the label paper 020 backward. The transmission assembly 400 disconnects the transmission connection between the printing roller 210 and the peeling roller 320, causing the peeling roller 320 to lose power and thus unable to actively drive the backing paper. Since the peeling roller 320 cannot drive the backing paper backward during paper ejection, but only serves to hold the backing paper, the backing paper can be ejected in a taut posture, avoiding the problem of the backing paper loosening or even accumulating between the peeling roller 320 and the printing roller 210, thereby ensuring that the next label can be reliably peeled off. The label printer 010 provided in this application embodiment has a reliable peeling function.

[0063] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A label printer for printing a predetermined content on a label of a label sheet, characterized by comprising: The device includes a printing assembly, a peeling assembly, and a transmission assembly. The printing assembly includes a printing roller and a print head disposed opposite to each other, the printing roller being used to drive the label paper to move. The peeling assembly includes a peeling roller and a pressure roller, the peeling roller and the pressure roller being tangentially engaged to hold the backing paper of the label paper. Along the forward direction of the backing paper, the peeling roller is located downstream of the printing roller. The transmission assembly is used to drive the printing roller and the peeling roller together when the printing roller rotates along the paper feeding direction, and to disconnect the drive connection between the printing roller and the peeling roller when the printing roller rotates along the paper retraction direction. The paper feeding direction is the direction in which the label paper is driven forward, and the paper retraction direction is the direction in which the label paper is driven backward. The transmission assembly includes a swing arm and a transmission wheel. The first end of the swing arm is sleeved on one end of the printing roller and is frictionally connected to the printing roller. The transmission wheel is disposed at the second end of the swing arm and is pulsatorically connected to the printing roller. When the printing roller rotates along the paper feeding direction, the printing roller drives the swing arm to rotate along a first direction so that the transmission wheel is pulsatorically connected to the peeling roller. When the transmission wheel is pulsatorically connected to the peeling roller, the first end of the swing arm slips relative to the printing roller. When the printing roller rotates along the paper ejection direction, the printing roller drives the swing arm to rotate along a second direction so that the transmission wheel is separated from the peeling roller. The first direction and the second direction are opposite.

2. The label printer of claim 1, wherein, The printing roller includes a printing mandrel and a printing rubber roller fixedly sleeved on the printing mandrel. The printing head is tangentially fitted to the printing rubber roller. The first end of the swing arm is provided with a core hole, which is sleeved with the printing mandrel. The inner wall of the core hole is frictionally connected to the outer periphery of the printing mandrel.

3. The label printer according to claim 1, characterized in that, The printing roller includes a printing mandrel and a printing rubber roller fixedly sleeved on the printing mandrel. The printing head is tangentially fitted to the printing rubber roller. A printing gear is fixedly sleeved on one end of the printing mandrel. The swing arm is frictionally connected to the end face of the printing gear.

4. The label printer according to claim 3, characterized in that, The transmission assembly further includes a first elastic element connected to the printing mandrel, which applies pressure to the rocker arm to create a frictional connection between the rocker arm and the end face of the printing gear.

5. The label printer according to claim 4, characterized in that, The first elastic element includes a compression spring, which is sleeved on the printing mandrel; the transmission assembly further includes a first sleeve and a pin, the first sleeve is sleeved on the printing mandrel and abuts against the first end of the compression spring, the first sleeve has at least two pin grooves, and the depth of each pin groove along the axial direction of the first sleeve is different, the pin is selectively located in one of the pin grooves and is inserted into the printing mandrel.

6. The label printer according to claim 3, characterized in that, The transmission assembly also includes a friction pad located between the printed gear and the rocker arm.

7. The label printer according to claim 1, characterized in that, The label printer further includes a fixed sleeve; the peeling roller includes a peeling mandrel and a peeling rubber roller fixedly sleeved on the peeling mandrel, the peeling rubber roller being tangentially fitted with the pressure roller to clamp the backing paper; the peeling assembly further includes a first one-way bearing, the inner ring of the first one-way bearing being sleeved on the peeling mandrel, the outer ring of the first one-way bearing being inserted into the fixed sleeve, the first one-way bearing being used to prevent the peeling rubber roller from rotating when the backing paper retracts.

8. The label printer according to claim 1, characterized in that, The label printer further includes a base frame and a locking assembly. The peeling assembly further includes a peeling bracket, which is pivotally connected to the base frame so that the peeling bracket can be opened or closed relative to the base frame by rotation. The peeling roller is disposed on the base frame, and the pressure roller is disposed on the peeling bracket. When the peeling bracket is closed relative to the base frame, the pressure roller is tangentially engaged with the peeling roller. When the peeling bracket is open relative to the base frame, the pressure roller is separated from the peeling roller. When the peeling bracket is closed relative to the base frame, the locking assembly is used to lock the position of the peeling bracket.

9. A label printer for printing preset content on labels of label paper, characterized in that, The device includes a printing assembly, a peeling assembly, and a transmission assembly. The printing assembly includes a printing roller and a print head disposed opposite to each other, the printing roller being used to drive the label paper to move. The peeling assembly includes a peeling roller and a pressure roller, the peeling roller and the pressure roller being tangentially engaged to hold the backing paper of the label paper. Along the forward direction of the backing paper, the peeling roller is located downstream of the printing roller. The transmission assembly is used to drive the printing roller and the peeling roller together when the printing roller rotates along the paper feeding direction, and to disconnect the drive connection between the printing roller and the peeling roller when the printing roller rotates along the paper retraction direction. The paper feeding direction is the direction in which the label paper is driven forward, and the paper retraction direction is the direction in which the label paper is driven backward. The printing roller includes a printing gear, a printing mandrel, and a printing rubber roller fixedly sleeved on the printing mandrel. The printing gear is fixedly connected to one end of the printing mandrel, and the print head is tangentially engaged with the printing rubber roller. The transmission assembly includes a second one-way bearing, a rocker arm, a transition gear, and a second elastic element. The inner ring of the second one-way bearing is sleeved on the printing mandrel, and the outer ring of the second one-way bearing is inserted into the first end of the rocker arm. The transition gear is located at the second end of the rocker arm and meshes with the printing gear. The second elastic element is connected to the rocker arm to ensure that the rocker arm always has... The printing roller rotates along the first direction; when the printing roller rotates along the paper feeding direction, the outer ring of the second one-way bearing slips with the inner ring of the second one-way bearing, and the second elastic element drives the rocker arm to rotate along the first direction so that the transition gear is connected to the peeling roller. When the printing roller rotates along the paper ejection direction, the outer ring of the second one-way bearing and the inner ring of the second one-way bearing are tightly engaged, driving the rocker arm to overcome the elastic force of the second elastic element and rotate along the second direction so that the transition gear is separated from the peeling roller. The first direction and the second direction are opposite.

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