Printer

Abstract

The printer comprises a main machine, a cover body and a printing roller, the printing roller comprises a roller part, a shaft core and a shaft sleeve set, the roller part is connected to the shaft core in a sleeving mode, the shaft sleeve set is connected to the shaft core in a sleeving mode and located on the end side of the roller part, the shaft sleeve set is movably connected to the cover body, and the shaft core can rotate relative to the cover body and the shaft sleeve set; the shaft sleeve group is clamped in the clamping hook assembly, so that when the printer performs printing, only the shaft core and the roller part sleeved on the shaft core rotate, and the shaft sleeve group clamped with the clamping hook assembly does not rotate basically, so that when the shaft core rotates, only rolling friction is generated between the shaft core and the interior of the shaft sleeve group, and the smoothness of the shaft core during rotation can be improved.

Description

Technical Field

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

[0002] A printer typically consists of a cover and a main unit. In related technologies, when the cover is closed to the printer main unit, the printing roller on the cover engages with a latch on the printer main unit, which restricts the cover from rotating relative to the main unit. During printing, the rotation of the printing roller causes the object to be printed to move, thus completing the printing of the object by the print head. However, in order to ensure the printing effect, the print head applies a force to the printing roller that pushes against the cover. When the printing roller rotates, it will rub against the latch, making it impossible for the printing roller to rotate smoothly. Utility Model Content

[0003] This application provides a printer that solves the problem that the printing roller cannot rotate smoothly because it rubs against the latch when it rotates.

[0004] This application provides a printer, including:

[0005] The host computer is equipped with a latch component;

[0006] The cover, rotatably connected to the main unit, has both a closed state and an open state; and

[0007] A printing roller includes a roller section, a shaft core, and a bushing assembly. The roller section is sleeved on the shaft core, and the bushing assembly is sleeved on the shaft core and located at the end side of the roller section. The bushing assembly is movably connected to the cover, and the shaft core is rotatable relative to the cover and the bushing assembly.

[0008] When the cover is in the closed state, the bushing assembly is engaged with the hook assembly.

[0009] In some embodiments, the printing roller further includes a drive gear that is sleeved on the shaft and fixed relative to the shaft.

[0010] The host is also equipped with a drive gear set, which meshes with the transmission gear when the cover is in the closed state.

[0011] In some embodiments, the transmission gear is spaced apart from the bushing assembly along the axial direction of the shaft core.

[0012] In some embodiments, the transmission gear is located on the edge of the cover;

[0013] And / or, the drive gear set is located at the edge of the main unit.

[0014] In some embodiments, the shaft core includes a central mounting section and sleeve sections located at both ends of the mounting section. The roller is sleeved on the mounting section and fixed relative to the mounting section. The bushing assembly includes two bushings, which are respectively sleeved on the two sleeve sections, and the inner diameter of the bushing is smaller than the outer diameter of the mounting section.

[0015] In some embodiments, the cover is provided with two mounting plates spaced apart along the axial direction of the shaft core, and the mounting plates are provided with mounting holes, into which the bushing is inserted.

[0016] In some embodiments, the bushing includes:

[0017] The sleeve section is inserted into the mounting hole; and

[0018] A limiting segment is connected to the side of the sleeve segment facing the mounting segment, and the outer diameter of the limiting segment is larger than the outer diameter of the sleeve segment;

[0019] Wherein, along the axial direction of the shaft core, the projection of the mounting plate on the first plane at least partially coincides with the projection of the limiting segment, and the first plane is parallel to the side of the limiting segment facing the sleeve segment.

[0020] In some embodiments, along the axial direction of the shaft, the distance between the two mounting plates is h1, the distance between the two ends of the mounting section is h2, and the distance between the two ends of the limiting section is h3. The h1, h2 and h3 satisfy that 0.5mm≤(h1-h2-2h3)≤3mm.

[0021] In some embodiments, the roller portion is an elastic roller portion.

[0022] In some embodiments, along the axial direction of the shaft core, the roller portion and the bushing assembly have a first gap, the first gap having a size of d1, where d1 satisfies: 0mm < d1 ≤ 2mm.

[0023] In some embodiments, there is a second gap between the inner wall of the bushing assembly and the outer wall of the shaft core, the size of the second gap being d2, where d2 satisfies: 0mm < d2 ≤ 0.5mm.

[0024] In some embodiments, both ends of the shaft extend to the edge of the cover, and the main unit is provided with a ribbon box. The ribbon box is disposed along the axial direction of the shaft at the edge of the main unit, wherein the ribbon box is provided with a clearance groove, and when the cover is in the closed state, at least a portion of the end of the shaft is located in the clearance groove.

[0025] In some embodiments, the hook assembly has a hook groove, the bushing assembly is engaged in the hook groove, and there is a third gap between the outer side wall of the bushing assembly and the inner side wall of the hook groove. The size of the third gap is d3, and d3 satisfies: 0mm < d3 < 0.5mm.

[0026] In some embodiments, the hook assembly is rotatably mounted on the host and has a first position and a second position. When the hook assembly is in the first position, the host blocks a portion of the hook groove opening to restrict the bushing assembly from disengaging from the hook groove opening. When the hook assembly is in the second position, the opening of the hook groove is located on the rotation trajectory of the bushing assembly.

[0027] In some embodiments, the host is further provided with a print head, and when the cover is in the closed state, the print head elastically abuts against the cover.

[0028] The printer based on the embodiments of this application uses a printing roller including a roller portion, a shaft core, and a bushing assembly. The roller portion is sleeved on the shaft core, and the bushing assembly is sleeved on the shaft core and located at the end side of the roller portion. The bushing assembly is movably connected to the cover. The shaft core can rotate relative to the cover and the bushing assembly. When the cover is in the closed state, the bushing assembly is engaged in the hook assembly. Thus, when the printer is printing, only the shaft core and the roller portion sleeved on the shaft core rotate, while the bushing assembly engaged with the hook assembly does not rotate much. Therefore, when the shaft core rotates, rolling friction only occurs with the inside of the bushing assembly, thereby improving the smoothness of the shaft core during rotation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0031] Figure 2 A schematic diagram of the main unit structure of a printer provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the printer provided in one embodiment of the present application from another perspective.

[0033] Figure 4 This is a schematic diagram of the printing roller structure in one embodiment of this application;

[0034] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0035] Figure 6 This is a schematic diagram of the cover structure of a printer provided in an embodiment of this application;

[0036] Figure 7 for Figure 6 Enlarged structural diagram at point A;

[0037] Figure 8 A schematic diagram of the printer cover provided in one embodiment of this application from another perspective;

[0038] Figure 9 for Figure 8 Enlarged structural diagram at point B;

[0039] Figure 10 This is a schematic diagram of the structure of a hook assembly provided in an embodiment of this application.

[0040] Figure reference numerals:

[0041] 100. Host computer;

[0042] 200, Hook assembly; 200a, Hook slot;

[0043] 300. Cover; 301. Mounting plate;

[0044] 400. Printing roller; 410. Roller section; 420. Shaft core; 421. Mounting section; 422. Sleeve section; 430. Bushing assembly; 431. Sleeve fitting section; 432. Limiting section; 440. Transmission gear;

[0045] 500. Drive gear set;

[0046] 600, ribbon box; 600a, clearance groove;

[0047] 700, Print head; 710, Back plate; 720, Front panel; 730, Compression spring. Detailed Implementation

[0048] 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.

[0049] In existing technology, printers generally include a cover and a main unit. When the cover is closed to the printer main unit, the printing roller on the cover engages with a latch on the printer main unit, which restricts the rotation of the cover relative to the main unit. During printing, the rotation of the printing roller drives the movement of the object to be printed, thereby completing the printing of the object by the print head. However, in order to ensure the printing effect, the print head applies a force to the printing roller that pushes against the cover. When the printing roller rotates, it will rub against the latch, making it impossible for the printing roller to rotate smoothly.

[0050] The object to be printed (also known as the printable item) can refer to label paper, belts, or other objects that need to have labels or patterns printed on their surfaces. In this embodiment, label paper is used as the object to be printed for illustrative purposes.

[0051] Therefore, to resolve the above issues, please refer to [link / reference needed]. Figure 1-3 This application provides a printer, including a host 100, a cover 300, and a printing roller 400.

[0052] The main unit 100 is the core component of the entire label printer, responsible for controlling the printing process, processing print data, and providing support and power to other components. The main unit 100 integrates key electronic components such as circuit boards, power management modules, and data processing units. Upon receiving a print command, the print head 700 ejects ink or toner onto the printable surface according to a preset pattern or text information, completing the printing task. The main unit 100 also includes a latch assembly 200 and the print head 700.

[0053] The cover 300 and the main unit 100 are rotatably connected through structures such as hinges, slide rails, and rotating shafts, which also allows the cover 300 to have a closed state and an open state, and the cover 300 can also flexibly switch between the closed state and the open state.

[0054] When the cover 300 is closed, it can protect the internal printing mechanism and consumables from external interference. When the cover 300 is open, users can easily access the printing area to perform operations such as loading label paper, cleaning the print head 700, or replacing the print roller 400, which improves the ease of use and maintenance of the equipment.

[0055] Please see Figure 4-5 The printing roller 400 includes a roller portion 410, a shaft core 420, and a bushing assembly 430. The roller portion 410 is sleeved on the shaft core 420, and the bushing assembly 430 is sleeved on the shaft core 420 and located on the end side of the roller portion 410. The bushing assembly 430 is movably connected to the cover 300, and the shaft core 420 can rotate relative to the cover 300 and the bushing assembly 430.

[0056] The roller 410 is fixed relative to the shaft core 420 and forms a printing channel with the print head 700. The roller 410 supports the label paper, and the print head 700 prints the set patterns and text on the label paper. The bushing assembly 430 is movable relative to the shaft core 420. Thus, when the cover 300 is in the closed state, the bushing assembly 430 is engaged with the hook assembly 200, and under the abutment of the print head 700, the bushing assembly 430 can abut against the hook assembly 200, ensuring the bushing... The bushing assembly 430 and the hook assembly 200 have sufficient friction, which reduces the probability of the bushing assembly 430 rotating relative to the hook assembly 200, ensuring the normal rotation of the shaft core 420 and the roller 410. The bushing assembly 430 is difficult to rotate or basically does not rotate. Thus, when the printing roller 400 rotates, only the shaft core 420 and the bushing assembly 430 generate rolling friction, and the friction force is relatively small, so the smoothness of the rotation of the shaft core 420 and the roller 410 on the shaft core 420 can be guaranteed.

[0057] Understandably, in order to further increase the smoothness of the rotation of the shaft core 420, a bearing structure can be set between the bushing assembly 430 and the shaft core 420. This can also make the inner wall of the bushing assembly 430 and the outer wall of the shaft core 420 smoother during processing. Similarly, the outer wall of the bushing assembly 430 can be made rougher, such as with patterns and particles, to increase the friction between the bushing assembly 430 and the hook assembly 200.

[0058] Further, please refer to Figure 4 The printing roller 400 also includes a transmission gear 440, which is sleeved on the shaft core 420 and fixed relative to the shaft core 420. The main unit 100 is also provided with a drive gear set 500, which meshes with the transmission gear 440 when the cover 300 is in the closed state.

[0059] The main unit 100 is also equipped with a drive motor, which can be connected to the drive gear set 500 via a reducer. When the cover 300 is in the closed state, the drive motor can drive the drive gear set 500 to rotate, and the drive gear set 500 can then drive the transmission gear 440 and the shaft core 420 to rotate. In this way, the printing roller 400 can support the label paper and drive the label paper to rotate.

[0060] The power of the host machine 100 is efficiently and accurately transmitted to the printing roller 400 through the drive gear set 500 and the transmission gear 440, driving it to rotate at a preset speed and direction, thus ensuring the printing effect and efficiency of the label paper.

[0061] The transmission gear 440 is located on the edge of the cover 300, and the drive gear set 500 is located on the edge of the main unit 100. This makes full use of the edge space of the printer, avoids the waste of internal space, and can reserve enough printing area for the label paper, making the overall structure of the printer more compact and beautiful.

[0062] Furthermore, with the cover 300 in the unfolded state, users can easily access the transmission gear 440 and the drive gear set 500, facilitating cleaning, lubrication, or maintenance, thus improving the printer's maintainability.

[0063] Based on the previous embodiment, please continue to refer to... Figure 5 Along the axial direction of the shaft core 420, the transmission gear 440 and the bushing assembly 430 are spaced apart. In this way, when the drive gear assembly 500 drives the transmission gear 440 to rotate, the transmission gear 440 will not interfere with the bushing assembly 430. That is, the bushing assembly 430 can be fixed relative to the hook assembly 200, thereby further ensuring the smooth rotation of the shaft core 420 and the roller 410.

[0064] Please see Figure 5 In one embodiment of this application, the shaft core 420 includes a middle mounting section 421 and sleeve sections 422 located at both ends of the mounting section 421. The roller portion 410 is sleeved on the mounting section 421 and fixed relative to the mounting section 421. The bushing assembly 430 includes two bushings, which are respectively sleeved on the two sleeve sections 422, and the inner diameter of the bushing is smaller than the outer diameter of the mounting section 421.

[0065] That is, the outer diameter of the mounting section 421 is larger than the inner diameter of the sleeve section 422. In this way, the two ends of the mounting section 421 can form a limit for the bushing, determine the installation position of the roller 410 and the bushing, and also avoid interference between the roller 410 and the bushing. The two bushings are respectively sleeved on the two ends of the shaft core 420, providing more balanced and stable support for the printing roller 400, which helps to reduce the vibration and shaking that may occur when the printing roller 400 rotates at high speed, thereby ensuring the stability and consistency of printing quality.

[0066] Please see Figure 6-7 In one embodiment of this application, the cover 300 is provided with two mounting plates 301 that are spaced apart along the axial direction of the shaft core 420. The mounting plates 301 are provided with mounting holes, and the bushing is inserted into the mounting holes. The mounting plates 301 serve as the support structure for the bushing, which can ensure that the bushing has good stability after installation.

[0067] The outer wall of the bushing has a gap with the inner wall of the mounting hole. This gap allows the cover 300 to have a certain clearance area when the cover is closed, so that the entire printing roller 400 can better cooperate with the print head 700. It also allows the bushing and the hook assembly 200 to cooperate more tightly under the pressure of the print head 700, thereby restricting the rotation of the bushing.

[0068] It is also understandable that the mounting plate 301 may have a notch that communicates with the mounting hole. The mounting plate 301 is connected to the cover 300 by screws, bolts, etc. With the mounting plate 301 connected to the cover 300, if wear is found on the printing roller 400, the mounting plate 301 can be removed and the entire printing roller 400 can be removed through the notch, which facilitates the inspection and replacement of the printing roller 400.

[0069] Furthermore, the bushing includes a fitting section 431 and a limiting section 432. The fitting section 431 is inserted into the mounting hole and supports the entire bushing through the mounting plate 301. The limiting section 432 is connected to the side of the fitting section 431 facing the mounting section 421, and the outer diameter of the limiting section 432 is larger than the outer diameter of the fitting section 431.

[0070] Wherein, along the axial direction of the shaft core 420, at least a portion of the projection of the mounting plate 301 on the first plane coincides with the projection of the limiting segment 432. The first plane is parallel to the side of the limiting segment 432 facing the sleeve segment 431. That is, after the printing roller 400 moves to a preset distance along the axial direction of the shaft core 420, the limiting segment 432 can contact the mounting plate 301, thereby restricting the printing roller 400 from falling off the mounting plate 301 and ensuring the stability of the printing roller 400 during printing.

[0071] The sleeve section 431 and the limiting section 432 are forged as a single piece to ensure the structural strength of the entire bushing.

[0072] Further, please refer to Figure 8-9 Along the axial direction of the shaft core 420, the distance between the two mounting plates 301 is h1, the distance between the two ends of the mounting section 421 is h2, and the distance between the two ends of the limiting section 432 is h3. h1, h2 and h3 satisfy 0.5mm≤(h1-h2-2h3)≤3mm.

[0073] That is, along the axial direction of the shaft core 420, the distance between the two mounting plates 301 minus the distance between the two ends of the mounting section 421, and then minus the distance between the two ends of the limiting section 432, the final value range is between 0.5mm and 3mm. Among them, (h1-h2-2h3) can be between any two values ​​of 0.5mm, 1.0mm, 1.5mm, 2.5mm, 3.0mm or above. By making (h1-h2-2h3) appropriate, the side wall of the middle protrusion of the shaft core 420 will have appropriate friction with the side wall of the limiting section 432, ensuring smooth rotation of the shaft core 420. On the other hand, by making (h1-h2-2h3) appropriate, the movement path of the printing roller along the axial direction is limited, reducing the possibility of printing roller wobbling, thereby ensuring the stability of printing roller 400.

[0074] In one embodiment of this application, the roller 410 is an elastic roller 410, that is, the material of the roller 410 is elastic. Optionally, the roller is made of rubber or silicone. The elastic material has good flexibility and resilience, which can better adhere to the label paper during the printing process, ensure uniform ink transfer, and thus improve the printing quality.

[0075] In addition, the elastic roller 410 can absorb some vibration and impact during the printing process, reduce noise generation, and improve the smoothness of equipment operation.

[0076] It is understandable that when the roller 410 is fixed relative to the shaft core 420, it can be fixed by interference fit or key connection. That is, a keyway is machined on the shaft core 420 and a corresponding keyhole is opened on the inner diameter of the roller 410. Then, the key is inserted into the keyway and keyhole, and the roller 410 is fixed to the shaft core 420 by the torque transmitted by the key. Alternatively, it can be a threaded connection or a glue connection, etc. There are no restrictions in this embodiment, as long as it is ensured that the roller 410 can be stably connected to the shaft core 420.

[0077] Please return and refer to Figure 5 To ensure that the shaft core 420 can roll smoothly relative to the bushing assembly 430, i.e., along the axial direction of the shaft core 420, the roller part 410 and the bushing assembly 430 have a first gap, the size of which is d1. d1 satisfies: 0mm < d1 < 2mm. Here, d1 can be within any two sets of values ​​of 0.5mm, 1.0mm, 1.5mm, 2.0mm or above. In this way, a suitable gap can be ensured between the roller part 410 and the bushing assembly 430, so that when the shaft core 420 rotates, the roller part 410 and the bushing assembly 430 are unlikely to come into contact, i.e., no friction will occur between them, thus ensuring the smoothness of the shaft core 420's rotation.

[0078] Furthermore, since there is a suitable gap between the roller section 410 and the bushing assembly 430, that is, the length of the roller section 410 is suitable, it can accommodate label paper of a wider width.

[0079] In addition, there is a second gap between the inner wall of the bushing assembly 430 and the outer wall of the shaft core 420. In order to further improve the smoothness of the rolling of the shaft core 420, the size of the second gap is d2, which satisfies: 0mm<d2≤0.5mm.

[0080] Wherein, d2 can be within any two sets of values ​​of 0.1mm, 0.2mm, 0.3mm, 0.5mm or above. This ensures that the inner wall of the bushing assembly 430 and the outer wall of the shaft core 420 have a suitable gap, so that the shaft core 420 can rotate smoothly within the bushing assembly 430. Secondly, it also makes it difficult for the bushing assembly 430 to wobble relative to the shaft core 420 when the shaft core 420 rotates, that is, it is difficult for the inner wall of the bushing assembly 430 to collide with the outer wall of the shaft core 420, thereby further improving the smoothness of the rotation of the shaft core 420.

[0081] Understandably, the main unit 100 is also equipped with a ribbon cartridge 600, which is used to carry the ribbon and to transport the ribbon. The ribbon guides the transport path to ensure that the ribbon can make correct contact with the print head 700 and the label paper, thereby realizing the printing function.

[0082] The ribbon cartridge 600 is located on the side of the main unit 100 along the axial direction of the spindle core 420, which can effectively utilize the edge space of the main unit 100, thereby reserving sufficient printing area for the label paper. In order to accommodate printing papers of wider widths, both ends of the spindle core 420 also extend to the edge of the cover 300. The ribbon cartridge 600 is provided with a relief groove 600a. When the cover 300 is in the closed state, at least a portion of the end of the spindle core 420 is located in the relief groove 600a. In this way, interference between the spindle core 420 and the ribbon cartridge 600 is avoided, ensuring the smoothness of the printing roller 400 during printing.

[0083] Furthermore, since there is no need to set extra space on the host 100 to avoid the end of the spindle core 420, but instead the end of the spindle core 420 is avoided by setting an avoidance groove 600a on the ribbon cartridge 600, the entire printer layout can be made compact, and the entire printer can be miniaturized.

[0084] In one embodiment of this application, please refer to... Figure 10 The hook assembly 200 has a hook groove 200a, and the bushing assembly 430 is engaged in the hook groove 200a. There is a third gap between the outer side wall of the bushing assembly 430 and the inner side wall of the hook groove 200a. The size of the third gap is d3, and d3 satisfies: 0mm < d3 < 0.5mm.

[0085] Wherein, d3 can be within any two sets of values ​​of 0.1mm, 0.2mm, 0.3mm, 0.5mm or above. This ensures that there is a suitable gap between the outer wall of the bushing assembly 430 and the inner wall of the hook groove 200a, which makes it easy for the bushing to be snapped into the hook assembly 200. Secondly, it also ensures that the bushing assembly 430 remains stable in the hook groove 200a and is not prone to shaking relative to the hook assembly 200. This ensures that the bushing assembly 430 and the shaft core 420 are unlikely to collide, thereby further ensuring the smoothness of the shaft core 420 during rotation.

[0086] Based on the previous embodiment, in order to enable the bushing assembly 430 to be engaged in the hook groove 200a when the cover 300 is in the closed state, and the hook groove 200a to release the bushing assembly 430 when the cover 300 is in the unfolded state, so as to avoid interference between the bushing assembly 430 and the hook assembly 200 when the cover 300 is switched between the closed and unfolded states.

[0087] Please see Figure 10 The hook assembly 200 is rotatably mounted on the host 100 and has a first position and a second position. When the hook assembly 200 is in the first position, the host 100 blocks part of the opening of the hook groove 200a to restrict the bushing assembly 430 from disengaging from the opening of the hook groove 200a. When the hook assembly 200 is in the second position, the opening of the hook groove 200a is located on the rotation trajectory of the bushing assembly 430.

[0088] When the hook assembly 200 is in the first position, the host 100 can block the slot opening of the hook groove 200a, which can effectively prevent the bushing assembly 430 from coming out of the hook groove 200a uncontrollably, thereby enhancing the stability and safety of the entire structure.

[0089] When the hook assembly 200 is in the second position, the opening of the hook groove 200a is located on the rotation trajectory of the bushing assembly 430. When the cover 300 drives the bushing assembly 430 to rotate, the bushing assembly 430 can disengage from the opening of the hook groove 200a. Therefore, by rotating the hook assembly 200, when the cover 300 is in the closed state, it is difficult for the cover 300 to separate from the other cover. When the cover 300 needs to be in the open state, it is only necessary to rotate the hook assembly 200.

[0090] It should be understood that the print head 700 in this embodiment is an elastic print head 700. Because it is elastic, it has a certain avoidance area, which can adapt to label paper of different thicknesses within a certain range, and can also ensure the printing effect.

[0091] In one embodiment, the printhead 700 may include a back plate 710, a front panel 720, and a compression spring 730 connected to the back plate 710 and the front panel 720. The front panel 720 is located on the side of the back plate 710 facing the print roller 400, and the printhead body 700 is disposed on the front panel 720. Both the back plate 710 and the front panel 720 are movably disposed on the host 100, so that the entire printhead 700 can be made elastic.

[0092] In addition, a drive mechanism is provided, which is connected to the back plate drive to drive the print head 700 closer to or further away from the print roller 400. This can further expand the range of label paper thickness, thereby making the printer more adaptable.

[0093] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0094] 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 printer, characterized in that, include: The host computer is equipped with a latch component; The cover is rotatably connected to the main unit so as to have a closed state and an unfolded state; as well as A printing roller includes a roller section, a shaft core, and a bushing assembly. The roller section is sleeved on the shaft core, and the bushing assembly is sleeved on the shaft core and located at the end side of the roller section. The bushing assembly is movably connected to the cover, and the shaft core is rotatable relative to the cover and the bushing assembly. When the cover is in the closed state, the bushing assembly is engaged with the hook assembly.

2. The printer according to claim 1, characterized in that, The printing roller also includes a transmission gear, which is sleeved on the shaft and fixed relative to the shaft. The host is also equipped with a drive gear set, which meshes with the transmission gear when the cover is in the closed state.

3. The printer according to claim 2, characterized in that, Along the axial direction of the shaft core, the transmission gear and the bushing assembly are spaced apart.

4. The printer according to claim 2, characterized in that, The transmission gear is located on the edge of the cover; And / or, the drive gear set is located at the edge of the main unit.

5. The printer according to claim 1, characterized in that, The shaft core includes a middle mounting section and sleeve sections located at both ends of the mounting section. The roller is sleeved on the mounting section and fixed relative to the mounting section. The bushing assembly includes two bushings, which are respectively sleeved on the two sleeve sections, and the inner diameter of the bushing is smaller than the outer diameter of the mounting section.

6. The printer according to claim 5, characterized in that, The cover is provided with two mounting plates that are spaced apart along the axial direction of the shaft core. The mounting plates are provided with mounting holes, and the bushing is inserted into the mounting holes.

7. The printer according to claim 6, characterized in that, The bushing includes: The sleeve section is inserted into the mounting hole; and A limiting segment is connected to the side of the sleeve segment facing the mounting segment, and the outer diameter of the limiting segment is larger than the outer diameter of the sleeve segment; Wherein, along the axial direction of the shaft core, the projection of the mounting plate on the first plane at least partially coincides with the projection of the limiting segment, and the first plane is parallel to the side of the limiting segment facing the sleeve segment.

8. The printer according to claim 7, characterized in that, Along the axial direction of the shaft core, the distance between the two mounting plates is h1, the distance between the two ends of the mounting section is h2, and the distance between the two ends of the limiting section is h3. h1, h2 and h3 satisfy 0.5mm≤(h1-h2-2h3)≤3mm.

9. The printer according to claim 1, characterized in that, The roller section is an elastic roller section.

10. The printer according to claim 1, characterized in that, Along the axial direction of the shaft core, the roller portion and the bushing assembly have a first gap, the size of the first gap being d1, where d1 satisfies: 0mm < d1 ≤ 2mm.

11. The printer according to claim 1, characterized in that, There is a second gap between the inner wall of the bushing assembly and the outer wall of the shaft core, and the size of the second gap is d2, which satisfies: 0mm < d2 ≤ 0.5mm.

12. The printer according to claim 1, characterized in that, Both ends of the shaft extend to the edge of the cover. The main unit is provided with a ribbon box, which is located on the edge of the main unit along the axial direction of the shaft. The ribbon box is provided with a clearance groove, and when the cover is in the closed state, at least a portion of the end of the shaft is located in the clearance groove.

13. The printer according to claim 1, characterized in that, The hook assembly has a hook groove, and the bushing assembly is engaged in the hook groove. There is a third gap between the outer side wall of the bushing assembly and the inner side wall of the hook groove. The size of the third gap is d3, and d3 satisfies: 0mm < d3 < 0.5mm.

14. The printer according to claim 13, characterized in that, The hook assembly is rotatably mounted on the host and has a first position and a second position. When the hook assembly is in the first position, the host blocks part of the hook groove opening to restrict the bushing assembly from disengaging from the hook groove opening. When the hook assembly is in the second position, the hook groove opening is located on the rotation trajectory of the bushing assembly.

15. The printer according to claim 13, characterized in that, The host is also equipped with a print head, and when the cover is in the closed state, the print head elastically abuts against the cover.

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