Separating display screen fixing mechanism, certificate card printer and display screen dismounting method

Abstract

The application discloses a split display screen fixing mechanism, a certificate card printer, and a display screen dismounting method. The display screen fixing mechanism comprises a main body, a display screen mounting cavity, a rear end positioning wall, a front end opening, at least one undercut, a slide buckle, an elastic reset member, and a fixing support. The display screen mounting cavity has the rear end positioning wall and the front end opening arranged opposite to the rear end positioning wall. The undercut is arranged on one side of the display screen mounting cavity and is used for clamping and positioning one side edge of the display screen. The slide buckle is movably arranged on the main body and corresponds to the other opposite side of the display screen mounting cavity. The slide buckle can slide relative to the main body between a locking position and an unlocking position. The slide buckle is provided with a buckle protrusion matched with the other opposite side edge of the display screen. The elastic reset member is used for applying an elastic force to the slide buckle and moving in the direction of the locking position. The fixing support is arranged on the slide buckle and the elastic reset member and is fixedly connected with the main body. The fixing support is used for limiting the slide buckle to move only in the sliding direction. The display screen fixing mechanism has the advantages of simple structure, convenient dismounting, reliable fixing, and reduced production cost.

Description

Technical Field

[0001] This invention relates to display screen installation technology, and in particular to a detachable display screen fixing mechanism and a method for assembling and disassembling a card printer and display screen. Background Technology

[0002] In the field of portable card printers, the display screen, as a core component of human-computer interaction, directly affects the ease of use and maintenance efficiency of the device due to its installation and fixing method. Since portable card printers need to be used in various scenarios, operators often need to separate the display screen from the printer body to achieve flexible operation in confined spaces, at long distances, or at special angles. Therefore, a detachable display screen fixing mechanism has become a key component of this type of equipment.

[0003] Currently, the existing technologies for fixing separate display screens mainly adopt the following two types of structures: Firstly, the full snap-fit ​​fixing structure. This type of structure sets multiple independent snaps around the perimeter of the display screen, and each snap engages with the corresponding slot on the main body, thereby achieving multi-point fixing of the display screen. For example, the prior art discloses a display screen snap-fit ​​installation structure, which uses elastic snaps distributed at the four corners to fix the display screen to the device housing. However, this type of structure has the following shortcomings: (1) When disassembling and assembling, multiple snaps need to be pressed or pried one by one to remove the display screen, which is cumbersome, especially in portable devices with limited space; (2) During repeated disassembly and assembly, multiple snaps are prone to excessive wear or breakage due to uneven force, and the elastic deformation of each snap is difficult to keep consistent, which can easily lead to some snaps being loose while others are still not unlocked, affecting the disassembly and assembly efficiency; (3) The snaps are mostly independent split structures, which need to be produced separately by mold and then assembled into the main body, resulting in a large number of parts, complex assembly process, and high cost.

[0004] Secondly, screw-assisted fixing structure. This type of structure uses screws to lock the display screen or its fixed frame to the main body. For example, multiple screw mounting holes are set around the display screen, and the screws are screwed to the main body to achieve fixation. The disadvantages of this type of structure are: (1) Disassembling and assembling the display screen requires the use of special tools such as screwdrivers, and it is impossible to disassemble and assemble quickly by hand. This seriously restricts work efficiency in operation scenarios that require frequent separation of the display screen; (2) Portable card printers are often accompanied by movement and vibration during use. Screws are prone to loosening or even falling off under long-term vibration, resulting in unstable fixation of the display screen and potential reliability hazards; (3) The auxiliary structures such as screws, screw mounting holes and positioning pins increase the number of parts and mold complexity, resulting in higher costs.

[0005] Furthermore, both types of existing structures share common shortcomings: in the fully snap-fit ​​structure, the snaps are mostly independently and dispersed, lacking a precise positioning design for the display screen, making it prone to positional deviations after assembly; while the screw-assisted structure offers relatively accurate positioning, the mounting holes and positioning posts require high machining precision, increasing manufacturing difficulty. Overall, existing technologies struggle to simultaneously meet the demands for ease of assembly and disassembly, stability, and low cost. Summary of the Invention

[0006] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a detachable display screen fixing mechanism and a method for disassembling and assembling a card printer and display screen. The mechanism is simple in structure, easy to disassemble and assemble, and reliably fixed, reducing production costs by 25-35%. It solves the problems of cumbersome operation, insufficient stability, and high cost in the existing technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A detachable display screen fixing mechanism includes: The main body has a display screen mounting cavity, which has a rear positioning wall and a front opening opposite to the rear positioning wall; at least one buckle is provided on one side of the display screen mounting cavity, which is used to engage and position with one side edge of the display screen. A sliding buckle is movably mounted on the main body on the opposite side of the display screen mounting cavity, and can slide between a locked position and an unlocked position relative to the main body. The sliding buckle is provided with a buckle protrusion that is adapted to the edge of the opposite side of the display screen. An elastic reset member is disposed between the main body and the sliding buckle, and is used to apply an elastic force to the sliding buckle to move toward the locked position; A fixed bracket is provided, which covers the sliding buckle and the elastic reset member and is fixedly connected to the main body, and is used to restrict the sliding buckle to move only in the sliding direction.

[0008] As a preferred embodiment, the undercut is integrally molded onto the main body. This eliminates the need for separate molds to produce individual snap-fit ​​parts before assembly, reducing the number of parts by over 40% and mold development costs by over 30%. Furthermore, the integrally molded structure eliminates assembly errors, resulting in higher precision and more accurate positioning between the undercut and the display screen slot. The integral undercut also eliminates the risk of elastic fatigue, preventing a decrease in locking force due to material fatigue after long-term use, compared to separate snap-fit ​​structures, thus extending its service life. The elimination of the assembly process for separate snap-fit ​​parts further reduces labor costs.

[0009] As a preferred embodiment, the elastic reset component is a compression spring. A sliding mounting groove is provided on the main body on the opposite side of the display screen mounting cavity. The sliding buckle is embedded in the sliding mounting groove. The elastic reset component is arranged along the sliding direction of the sliding buckle, with one end abutting against the fixed bracket or the main body, and the other end abutting against the sliding buckle. Since the sliding buckle is embedded in the sliding mounting groove, the groove provides initial sliding guidance and limitation for the sliding buckle, ensuring that the sliding buckle does not deviate along the predetermined direction. The compression spring, as an elastic reset component, has a simple structure, low cost, and is a standard universal component, making it convenient to purchase and replace. The arrangement of one end of the spring abutting against the fixed bracket or the main body and the other end abutting against the sliding buckle eliminates the need for additional spring seats or retaining rings, simplifying the structure. The spring's arrangement along the sliding direction results in the shortest and most direct force transmission path, ensuring that the spring force can be efficiently converted into the power to drive the sliding buckle to reset.

[0010] As a preferred embodiment, the end of the sliding buckle opposite to the buckle protrusion is provided with a spring positioning protrusion, and one end of the elastic reset member is sleeved on the corresponding spring positioning protrusion. The spring positioning protrusion forms a radial limit on one end of the spring, ensuring that the spring always moves along the axial direction during compression and reset, avoiding radial offset, skewing, or dislodgement of the spring; the spring is directly sleeved on the positioning protrusion, requiring no additional fixing parts, and assembly only requires inserting the spring, achieving quick spring installation; the spring positioning protrusion is located at the end of the sliding buckle, so that the force transmission between the spring and the sliding buckle acts directly on the movement axis of the sliding buckle, avoiding the generation of eccentric torque, making the sliding buckle slide more smoothly and steadily. Furthermore, a spring baffle is integrally formed on the rear side of the main body, and the other end of the elastic reset member abuts against the spring baffle. The spring baffle is integrally molded with the main body, providing a support point for the spring without the need for additional parts, further reducing the number of parts. The spring baffle is located on the rear side of the main body, corresponding to the spring positioning protrusion at the end of the slide buckle, making the spring's installation position precise and stable. The integrally molded structure of the spring baffle eliminates assembly loosening issues, and the spring's support remains firm and reliable even after long-term use, ensuring the long-term effectiveness of the elastic reset component. Combined with the spring positioning protrusion on the slide buckle, both ends of the spring are positioned by the positioning protrusion and the spring baffle respectively, enabling tool-free and quick installation of the spring without additional parts.

[0011] As a preferred embodiment, the inner wall of the sliding buckle mounting groove is provided with one of a guide strip and a guide groove, and the sliding buckle is correspondingly provided with the other of the guide strip and guide groove. The guide strip is adapted to be embedded in the guide groove to guide the sliding of the sliding buckle and limit the displacement of the sliding buckle in the vertical direction. In this way, the cooperation of the guide strip and the guide groove further improves the sliding accuracy of the sliding buckle, ensures the precise alignment of the buckle protrusion with the display screen buckle slot, and avoids jamming or incomplete locking caused by the sliding buckle offset.

[0012] As a preferred embodiment, the fixed bracket is installed on the rear side of the main body, so that the elastic reset member is hidden between the fixed bracket and the rear side of the main body, and a sliding limiting groove is formed between the fixed bracket and the rear side of the main body for the sliding buckle to extend into. Because the elastic reset member is hidden between the fixed bracket and the rear side of the main body, a closed protection is formed, preventing external dust and foreign objects from entering the spring mounting area and affecting the normal operation of the spring, while also maintaining a neat and aesthetically pleasing appearance. The sliding limiting groove formed between the fixed bracket and the rear side of the main body provides dual limiting for the sliding buckle in both the vertical and horizontal directions, ensuring that the sliding buckle can only move in the sliding direction, avoiding vertical movement or horizontal displacement during sliding. The sliding limiting groove itself also has a guiding function, making the sliding of the sliding buckle smoother and improving the operating feel. The fixed bracket achieves both spring concealment protection and sliding buckle limiting and guiding functions in a single assembly, resulting in a high degree of structural integration.

[0013] As a preferred embodiment, the rear side of the sliding buckle is integrally provided with a sliding limiting piece, and a sliding limiting clearance groove is reserved on the fixed bracket, the main body, or between the two. The sliding limiting piece extends into the sliding limiting clearance groove. When the sliding buckle slides relative to the main body, the sliding limiting piece slides synchronously within the sliding limiting clearance groove. The cooperation structure of the sliding limiting piece and the sliding limiting clearance groove physically limits the sliding stroke of the sliding buckle. When the sliding buckle slides to the unlocked position, the limiting piece abuts against the end wall of the clearance groove, preventing excessive sliding of the sliding buckle from causing excessive compression of the spring and damage, or the sliding buckle from disengaging from the mounting groove. Simultaneously, the other end wall of the clearance groove can be used to control the locking force of the sliding buckle on the display screen. The limiting piece and the sliding buckle are integrally molded, requiring no additional parts, and the structure is simple and reliable. The synchronous sliding of the limiting piece in the clearance groove further enhances the guiding accuracy of the sliding buckle and prevents the sliding buckle from deviating or twisting during the sliding process. During operation, the contact between the limiting piece and the end wall of the clearance groove at the extreme position allows the operator to better perceive that the unlocking is in place, improving the human-computer interaction experience.

[0014] As a preferred embodiment, the front of the sliding latch is provided with an operating part for the operator to manually push the latch from the locked position to the unlocked position. The operating part is located on the front of the latch, facing the user's direction of operation, allowing the operator to push it directly by hand without any tools, achieving a convenient one-button unlocking operation. The operating part's design ensures that the direction of force application is consistent with the sliding direction of the latch, resulting in high force transmission efficiency; the operator can unlock the latch with minimal pushing force. The operating part also serves as a visual cue, allowing the operator to quickly identify the latch's operating position and reducing the probability of misoperation. Compared to traditional screw-fixing structures that require finding tools and aligning screw holes, the operating part design makes unlocking intuitive and simple, improving maintenance efficiency.

[0015] A card printer includes a card printer body and a display screen disposed on the card printer body. The display screen is mounted on the card printer body via a detachable display screen fixing mechanism as described in any of the preceding claims. This allows the card printer to have a function of quick-detaching and detaching the display screen, facilitating operation of the display screen by the operator in portable scenarios. During device movement and carrying, the display screen remains stable and does not wobble due to the fixing mechanism, ensuring the reliability of the device and the user experience. The display screen can be quickly detached from the card printer body, making it easy to hold and operate the display screen in hand in confined spaces or special operating scenarios, improving the adaptability of the portable card printer in various application scenarios.

[0016] A method for disassembling and assembling a display screen includes the following steps: A main body is provided, the main body having a display screen mounting cavity, the display screen mounting cavity having a rear positioning wall and a front opening, and an undercut is provided on one side of the display screen mounting cavity; Insert the display screen into the display screen mounting cavity through the front opening, so that one edge of the display screen engages with the snap-fit ​​and is positioned, and the rear edge of the display screen abuts against the rear positioning wall; The sliding buckle is driven by the elastic reset component to slide from an unlocked position to a locked position, so that the buckle protrusion on the sliding buckle engages and locks with the opposite edge of the display screen, thereby fixing the display screen to the main body; When the display screen needs to be removed, the elastic force of the elastic reset member is overcome to push the sliding buckle from the locked position to the unlocked position, so that the buckle protrusion disengages from the opposite edge of the display screen, and the display screen can be removed from the front opening; The sliding buckle is restricted to move only in the sliding direction by a fixed bracket.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly involves providing a display screen mounting cavity on the main body, the display screen mounting cavity having a rear positioning wall and a front opening opposite to it; a buckle is provided on one side of the mounting cavity, and a sliding buckle is provided on the other side, with a buckle protrusion on the sliding buckle; an elastic reset member is provided between the main body and the sliding buckle; and a fixed bracket is provided above the sliding buckle and the elastic reset member. Utilizing a structure consisting of a display mounting cavity, a rear positioning wall, and a front opening, the display is inserted into the mounting cavity from the front. The rear positioning wall provides a rear limit to the display, preventing over-insertion or backward movement after assembly. The front opening facilitates easy placement and removal of the display. Furthermore, the asymmetrical design employs a single-sided inverted latch and a single-sided sliding latch. Compared to traditional multi-latch structures, locking and unlocking can be completed by operating only one side of the sliding latch, significantly simplifying assembly and disassembly. Since the fixing bracket is mounted on the sliding latch and the elastic reset component, a single assembly simultaneously limits the sliding latch and the elastic reset component, preventing parts from falling off. This replaces the traditional design of multiple independent limiting blocks, simplifying the assembly process. With fewer parts and a compact structure, it is suitable for the miniaturization needs of portable devices.

[0018] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a perspective view of a detachable display screen fixing mechanism according to an embodiment of the present invention; Figure 2 This is an exploded view of a detachable display screen fixing mechanism according to an embodiment of the present invention; Figure 3 yes Figure 2 A magnified view of a portion of the image; Figure 4 This is an exploded view of the sliding buckle 1, the elastic reset member 2, and the fixing bracket 3 according to an embodiment of the present invention; Figure 5 This is another exploded view of the detachable display screen fixing mechanism according to an embodiment of the present invention; Figure 6 yes Figure 5 A magnified view of a portion of the image; Figure 7 This is another exploded view of the sliding buckle 1, the elastic reset member 2, and the fixing bracket 3 according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of a detachable display screen fixing mechanism according to an embodiment of the present invention (display screen 4 is mounted on the main body 5). Figure 9 yes Figure 8 A magnified view of a portion of the image; Figure 10This is a partial cross-sectional view of the detachable display screen fixing mechanism according to an embodiment of the present invention (unlocked, ready to remove the display screen 4 from the main body 5).

[0020] Figure 11 This is a cross-sectional view of the detachable display screen fixing mechanism according to an embodiment of the present invention (unlocking, removing the display screen 4 from the main body 5).

[0021] Figure 12 This is a three-dimensional illustration of a detachable display screen fixing mechanism applied to a card printer, according to an embodiment of the present invention. Detailed Implementation

[0022] Please refer to Figures 1 to 12 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0023] In the description of this invention, it should be noted that the terms "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 invention 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, they should not be construed as limiting this invention.

[0024] A detachable display screen fixing mechanism for a portable card printer includes: a main body 5, a sliding buckle 1, an elastic reset component 2, and a fixing bracket 3; the display screen 4 is mounted on the main body 5 and is movablely locked and unlocked using the sliding buckle 1.

[0025] The main body 5 has a plate-like structure and a display screen mounting cavity 51. The display screen mounting cavity 51 has a rear positioning wall 511 and a front opening 512 opposite to the rear positioning wall 511. At least one buckle 52 is provided on one side of the display screen mounting cavity 51, and the buckle 52 is used to engage and position with one side edge of the display screen 4. Preferably, the buckle 52 is integrally formed on the main body 5. Through the main body's built-in buckle + sliding buckle + elastic reset component + fixing bracket, an asymmetrical fixing scheme for unilateral fixing and unilateral movable locking of the display screen is formed. Compared with traditional multi-buckle structures, the buckle is integrally formed on the main body, eliminating the need for additional parts, simplifying the structure and reducing mold development costs. Compared with screw fixing structures, unlocking can be achieved by sliding the sliding buckle, requiring no tools and requiring fewer operation steps, greatly improving the ease of assembly and disassembly. The fixing bracket's limiting effect on the sliding buckle ensures the accuracy of the sliding direction, avoiding locking failure caused by buckle offset, and improving the stability and reliability of the mechanism. It also limits the right side and right front end of the display screen 4, preventing any movement gaps in the front-to-back direction. Typically, if a single buckle 52 is provided and centered on one side, in other embodiments, two symmetrically distributed buckles can be integrally formed on one side of the main body 5. The two buckles engage and position themselves near the top and bottom ends of one side edge of the display screen. The two buckles provide two-point support and limit for one side edge of the display screen, effectively preventing the display screen from rotating or tilting in the vertical plane and ensuring the alignment accuracy of the left and right sides of the display screen with the corresponding slots. Compared to a single buckle, the double buckle structure provides greater engaging force and more stable support on one side of the display screen, preventing the display screen from warping or shaking during device movement or vibration. Similarly, the two buckles are integrally formed with the main body, requiring no additional assembly, and are formed in one step during injection molding, ensuring the relative positional accuracy between the two buckles and reducing cumulative assembly errors.

[0026] The sliding buckle 1 is movably installed on the main body 5 on the opposite side of the display screen mounting cavity 51, and can slide between a locked position and an unlocked position relative to the main body 5. The sliding buckle 1 is provided with a buckle protrusion 11 that is adapted to the opposite edge of the display screen 4.

[0027] The elastic reset member 2 is disposed between the main body 5 and the sliding buckle 1, and is used to apply an elastic force to the sliding buckle 1 to move toward the locking position.

[0028] The fixed bracket 3 is placed on the sliding buckle 1 and the elastic reset member 2, and is fixedly connected to the main body 5, so as to restrict the sliding buckle 1 to move only in the sliding direction.

[0029] After the display screen 4 is installed into the display screen mounting cavity 51, one edge of it is engaged and positioned by the buckle 52, and the other opposite edge is locked by the buckle protrusion 11 of the sliding buckle 1, forming an asymmetrical fixing structure with one-sided fixed and one-sided movable locking.

[0030] In this embodiment, the elastic reset member 2 is a pressure spring, and two springs are provided. The two springs are symmetrically arranged between the sliding buckle and the main body. The main body 5 has a sliding buckle mounting groove 53 on the opposite side of the display screen mounting cavity 51. The sliding buckle 1 is embedded in the sliding buckle mounting groove 53. The elastic reset member 2 is arranged parallel to the sliding direction of the sliding buckle 1, with one end abutting against the fixed bracket 3 or the main body 5, and the other end abutting against the sliding buckle 1. The symmetrical double-spring structure ensures that the force on both sides of the sliding buckle is balanced, avoiding the tilting and jamming problems that are prone to occur when the sliding buckle slides in a single-spring structure, making the sliding process of the sliding buckle smooth and stable. The resultant force provided by the double springs increases, ensuring that the sliding buckle fits tightly against the edge of the display screen when locked, and the locking is firm and reliable. Even if one side of the spring fatigues or fails, the other side of the spring can still provide a certain locking force, improving the fault tolerance and service life of the mechanism. The opening direction of the sliding buckle mounting groove 53 faces the display screen and is open at the front. At the same time, it extends through the rear side of the main body 5. The sliding buckle 1 slides within the sliding buckle mounting groove 53. When the sliding buckle 1 is in the locked position, its latching protrusion 11 engages with the opposite edge of the display screen 4, forming an inverted buckle, which effectively limits the right side and the front right side of the display screen 4. When the sliding buckle is in the unlocked position, its latching protrusion 11 retracts into the sliding buckle mounting groove 53 and disengages from the opposite edge of the display screen 4. Therefore, the latching protrusion 11 extends directly into or out of the right edge of the display screen 4 along a straight left-right direction, with the shortest locking path and no directional deviation, making the locking action direct and efficient. Moreover, the latching protrusion 11 retracts completely into the sliding buckle mounting groove 53 when unlocking, avoiding interference or scratching between the latching protrusion 11 and the edge of the display screen 4 during screen removal, ensuring smooth screen removal without damaging the display screen 4. The structure of the sliding buckle 1 embedded in the sliding buckle mounting groove 53 makes the overall appearance neat, while the sliding buckle mounting groove 53 also provides a certain degree of limitation and protection for the sliding buckle 1 itself.

[0031] Two symmetrical spring positioning protrusions 12 are provided at the end of the sliding buckle 1 opposite to the buckle protrusion 11, and one end of the elastic reset member 2 is sleeved on the corresponding spring positioning protrusion 12. A spring baffle 54 is integrally formed on the rear side of the main body 5, and the other end of the elastic reset member 2 abuts against the spring baffle 54. A limiting wall 541 with an upper and lower spacing extends integrally on the right side of the spring baffle 54 to form a limiting groove 542, and the other end of the elastic reset member 2 extends into the limiting groove 542. The two ends of the spring are precisely positioned by the spring positioning protrusion 12, the spring baffle 54, and the limiting groove 542, respectively. This eliminates the need for additional spring fixing parts such as spring seats and retaining rings, reducing the number of parts and simplifying the assembly process. It also ensures that the spring always moves along the axial direction during compression and reset, preventing radial offset, skewing, or dislodgement, thus improving the stability and reliability of the spring. During assembly, simply insert the two ends of the spring into the corresponding spring positioning protrusion and limiting groove, without the need for tools, achieving quick installation of the spring.

[0032] The fixing bracket 3 is an integrally formed rectangular cover plate structure. Screw mounting holes 31 are provided at each of the four corners of the fixing bracket 3, and threaded holes 55 are correspondingly provided on the rear side of the main body 5. The fixing bracket 3 is detachably fixed to the main body 5 by screws passing through the screw mounting holes 31 and the threaded holes 55. The four-corner screw layout ensures a uniform distribution of the connection force between the fixing bracket 3 and the main body 5, ensuring the stability of the fixing bracket 3 in limiting the sliding buckle 1 and the spring, and avoiding deformation or failure of the fixing bracket 3 due to uneven local force. The screw connection method makes the fixing bracket 3 detachable. When maintenance or replacement of the sliding buckle 1 and the spring is required, the fixing bracket 3 can be removed simply by unscrewing the screws, making maintenance convenient. Compared with snap-on fixing brackets, screw connections have higher connection strength and vibration resistance. In scenarios involving frequent movement and vibration of portable devices, the fixing bracket 3 is less likely to loosen, improving overall reliability.

[0033] In this embodiment, the fixing bracket 3 includes a rear side plate and peripheral side plates integrally connected to the upper, lower, and left ends of the rear side plate. The peripheral side plate at the left end is located outside the left end of the spring baffle 54, and the peripheral side plates at the upper and lower ends are located outside the corresponding upper and lower side plates of the sliding buckle 1. The fixing bracket 3 forms a multi-faceted protective and limiting function for the spring and the sliding buckle 1. The fixing bracket 3 is installed on the rear side of the main body 5, so that the elastic reset member 2 is hidden between the fixing bracket 3 and the rear side of the main body 5. A sliding limiting groove 3-5 is formed between the fixing bracket 3 and the rear side of the main body 5 for the sliding buckle 1 to extend into, which plays a sliding guiding role in the left and right directions. At the same time, it limits the sliding buckle in the front and back directions, ensuring that the sliding buckle will not shift back and forth during the sliding process, thus ensuring the alignment accuracy between the buckle protrusion and the display screen slot. The sliding buckle 1 has a sliding base plate portion that extends into the sliding limiting groove 3-5. A right end plate is integrally connected to the right end of the sliding base plate portion. A spring positioning protrusion 12 extends integrally to the right from the right side of the right end plate. The front end face of the sliding base plate portion is recessed with a guide groove 15 extending to the left and right. Correspondingly, a guide strip 57 is protruded on the front inner wall surface of the main body 5 corresponding to the sliding limiting groove 3-5. The guide strip 57 is adapted to the corresponding guide groove 15. In this embodiment, both the guide strip 57 and the guide groove 15 are provided with two parallel vertically arranged strips. The guide strip 57 and the guide groove 15 are used to further improve the left and right sliding accuracy of the sliding buckle 1. The aforementioned right end plate and the upper and lower side plates of the sliding base plate portion can also be used as sliding guide portions adapted to the sliding limiting groove 3-5, and their front and rear widths can match the front and rear groove widths of the sliding limiting groove 3-5.

[0034] Furthermore, a sliding limiting piece 13 is integrally protruding from the rear side of the sliding buckle 1. A left-right extending sliding limiting clearance groove 62 is pre-reserved on the fixed bracket 3, the main body 5, or between the two. A notch is directly provided at the right end of the fixed bracket 3 for the sliding limiting piece 13 to extend into. The sliding limiting piece 13 extends into the sliding limiting clearance groove 62; when the sliding buckle 1 slides left-right relative to the main body 5, the sliding limiting piece 13 slides synchronously within the sliding limiting clearance groove 62. The vertical width of the sliding limiting piece 13 matches the vertical width of the sliding limiting clearance groove 62 to achieve a better limiting effect. Limiting the sliding buckle from the vertical direction ensures that it does not move up and down during sliding, guaranteeing the alignment accuracy between the buckle protrusion and the display screen slot. By using the fixed bracket 3, the dual limiting of the sliding buckle 1 and the spring is achieved in one assembly, replacing the traditional design of multiple independent limiting blocks, simplifying the structure and reducing the assembly difficulty; due to the all-round limiting and sliding guidance of the sliding buckle 1, the smoothness of the sliding of the sliding buckle 1 and the operation feel are further improved.

[0035] Furthermore, the front side of the sliding buckle 1 is provided with an operating part 14 for the operator to manually push the sliding buckle 1 from the locked position to the unlocked position. This part can be a recess or anti-slip texture formed on the front surface of the sliding buckle 1. In this embodiment, a recess is used to form the finger insertion point, which is convenient to operate and has a simple structure. The operating part is integrally formed when manufacturing the sliding buckle 1. The good operating feel allows the operator to complete the unlocking operation with a small pushing force and a precise displacement, reducing the risk of damage to the sliding buckle or spring due to improper operation. Of course, the recess also serves as a visual indicator of the operating position, making it easier for the operator to quickly find the operating part of the sliding buckle and improving the user-friendliness of human-computer interaction. Alternatively, several anti-slip textures can be provided on the front surface of the sliding buckle to increase the friction between the operator's fingers and the sliding buckle, making it less likely for the fingers to slip when manually pushing the sliding buckle, thus improving the operating feel.

[0036] In this embodiment, one of the inverted buckle 52 and the latching protrusion 11 is located on the left side of the display mounting cavity 51, and the other is located on the right side of the display mounting cavity 51. In other embodiments, one of the inverted buckle 52 and the latching protrusion 11 is located on the upper side of the display mounting cavity 51, and the other is located on the lower side of the display mounting cavity 51. By using the inverted buckle and the latching protrusion respectively located on the left and right sides or the upper and lower sides of the display mounting cavity, a counter-locking structure with opposing directions is formed, so that the display is subject to bidirectional constraint in the horizontal or vertical direction, and the fixation is more stable. Generally, the left-right layout is suitable for horizontally elongated display screens, and the top-bottom layout is suitable for vertically elongated display screens. The two layouts allow the fixing mechanism to adapt to display screens of different shapes and sizes, thus expanding its applicability. The counter-locking structure ensures that the force on the display screen is symmetrical and balanced, avoiding the tilting of the display screen or local stress concentration caused by unilateral force. Regardless of whether the left-right or top-bottom layout is used, only one side of the sliding buckle needs to be operated during disassembly and assembly, maintaining the convenience of unilateral operation.

[0037] When assembling the sliding buckle 1, insert it into the sliding buckle mounting groove 53 from the rear side of the main body 5. The guide bar 57 is adapted to the guide groove 15. The operating part of the sliding buckle 1 protrudes from the front opening of the sliding buckle mounting groove 53 onto the front surface of the main body 5. The spring is sleeved between the spring positioning protrusion 12 and the spring baffle 54. Then, align the screw mounting holes 31 at the four corners of the fixing bracket 3 with the threaded holes 55 of the main body 5, and fix them at once with four screws to complete the overall assembly without complicated positioning or multi-step fastening. Compared with the traditional split buckle structure (which requires the separate assembly of multiple buckles and limit blocks), the assembly time of this application is reduced by more than 50%, and the stability problems caused by assembly errors are reduced. Ordinary workers can complete the assembly without professional training.

[0038] Combined Figure 12As shown, a card printer is also provided, which includes a card printer body 100 and a display screen 4 disposed on the card printer body 100. The display screen 4 is mounted on the card printer body 100 by a detachable display screen fixing mechanism as described in any of the preceding items. The left and right edges of the display screen 4 are semi-circular convex arc surfaces, and the inner surfaces of the buckle protrusion 11 and the inverted buckle 52 are respectively concave arc surfaces to better adapt and position the left and right edges of the display screen 4.

[0039] When assembling the display screen 4, in its natural state, the latching protrusion 11 of the sliding buckle 1 protrudes towards the display screen mounting cavity 51, covering part of the space at the left front end of the display screen mounting cavity 51. First, operate the sliding buckle 1 with one hand to move it to the left, so that the latching protrusion 11 is away from the display screen mounting cavity 51. Then, insert the right end of the display screen 4 into the inside of the inverted buckle 52 (also referring to the rear side) of the display screen mounting cavity 51. Subsequently, the left end of the display screen 4 is also inserted into the display screen mounting cavity 51 and positioned. Release the sliding buckle 1, and under the reset force of the elastic reset member 2, the sliding buckle 1 slides to the right to reset, so that the latching protrusion 11 of the sliding buckle 1 abuts against the left side and the left front end of the display screen 4. In this way, the display screen 4 is omnidirectionally limited. When it is necessary to remove the display screen 4, move the sliding buckle 1 to the left, so that the latching protrusion 11 is away from the display screen mounting cavity 51, and then remove the display screen 4 through the removal port 56. It can be seen that the use of this fixing mechanism makes the assembly and disassembly of the display screen 4 simple and quick.

[0040] In other embodiments, a positioning post extending upwards can be provided on the lower inner wall of the display mounting cavity. The positioning post is relatively small in height, and correspondingly, a positioning hole adapted to the positioning post is provided at the bottom of the display 4. When assembling the display, after the right end of the display 4 extends into the inside of the inverted buckle 52 of the display mounting cavity 51 and is in place (i.e., the right end of the display 4 abuts against the inverted buckle 52 to form a right end stop limit), at this time, the positioning hole and the positioning post are aligned. Then, the display is slightly lowered, and the positioning post extends into the positioning hole to achieve bottom positioning. Then, the sliding buckle 1 at the left end forms a locking limit on the left end of the display 4, thus achieving triple fixation of left and right locking and bottom positioning.

[0041] As described above, after the display screen 4 is installed into the display screen mounting cavity 51, its rear edge is limited by the rear positioning wall 511, its right edge is limited by the snap fastener 52, and its left edge is locked by the snap protrusion 11 of the sliding buckle 1. Simultaneously, the front of the display screen is exposed through the front opening 512 for operation, and the snap fastener 52 hooks onto the right front edge of the display screen, preventing it from detaching from the front. Thus, the display screen is constrained in the front-back, left-right, and up-down directions, achieving complete positioning and locking. During unlocking, only one side of the sliding buckle needs to be operated to break the constraint on the left side and remove the display screen, while the snap fastener on the right side remains engaged throughout the unlocking process, ensuring that the display screen will not accidentally fall off at the moment of unlocking. It is particularly important to emphasize that the structural design of this invention also produces an unexpected technical effect of a single-sided unlocking and semi-locking intermediate state: when the operator pushes the sliding buckle 1 to the unlocking position, the left constraint of the display screen 4 is released, but the right side remains engaged by the snap fastener 52, and the rear end remains limited by the positioning wall 511. At this point, display screen 4 is in a stable semi-locked intermediate state, allowing it to be pulled out to the left with force applied to it, yet preventing it from falling off automatically due to the loss of all restraint. This intermediate state allows the operator to complete the unlocking and screen removal actions with one hand, without worrying about the display screen slipping and getting damaged, thus improving operational safety and convenience.

[0042] Furthermore, a method for disassembling and assembling a display screen is provided, comprising the following steps: Provide a main body 5, the main body having a display screen mounting cavity 51, the display screen mounting cavity having a rear positioning wall 511 and a front opening 512, and a buckle 52 is provided on one side of the display screen mounting cavity; Insert the display screen 4 into the display screen mounting cavity 51 through the front opening 512, so that one side edge of the display screen engages with the buckle 52 for positioning, and the rear edge of the display screen abuts against the rear positioning wall 511. The elastic reset member 2 drives the sliding buckle 1 to slide from an unlocked position to a locked position, so that the buckle protrusion 11 on the sliding buckle engages and locks with the other opposite edge of the display screen, thereby fixing the display screen 4 to the main body 5; When it is necessary to remove the display screen 4, the elastic force of the elastic reset member 2 is overcome to push the sliding buckle 1 from the locked position to the unlocked position, so that the buckle protrusion 11 disengages from the other opposite edge of the display screen 4, and the display screen 4 can be removed from the front opening 512; The sliding buckle 1 is restricted to moving only in the sliding direction by the fixed bracket 3.

[0043] Preferably, this display screen assembly / disassembly method is based on the detachable display screen fixing mechanism described herein.

[0044] The key design feature of this invention is a display screen mounting cavity on the main body. This cavity has a rear positioning wall and a corresponding front opening. One side of the cavity has an inverted buckle, and the other side has a slidable sliding buckle with a latching protrusion. An elastic reset component is located between the main body and the sliding buckle. A fixing bracket covers the sliding buckle and the elastic reset component. Utilizing this structure of display screen mounting cavity + rear positioning wall + front opening, the display screen is inserted into the cavity from the front. The rear positioning wall provides rear-side restraint, preventing excessive insertion or backward movement after assembly. Simultaneously, the front opening facilitates the removal and placement of the display screen. Furthermore, the asymmetrical design of a single-sided inverted buckle + single-sided sliding buckle simplifies the assembly and disassembly process significantly compared to traditional multi-buckle structures, requiring only one side of the sliding buckle to lock and unlock. Since the fixing bracket covers the sliding buckle and elastic reset component, a single assembly simultaneously restrains both components, preventing them from falling off and replacing the traditional design of multiple independent restraining blocks, thus simplifying the assembly process. The overall design has fewer parts and a compact structure, making it suitable for the miniaturization needs of portable devices.

[0045] It is worth mentioning that this device also possesses an unexpected failure safety feature. According to the applicant's tests, because it uses a horizontally extending pressure spring, which has the longest natural length, even if the elastic reset component experiences elastic decay due to long-term use, the latch protrusion will remain in the locked position and will not automatically slide to the unlocked position. Although the clamping force on the left side of the display screen may weaken, it will still have a stopping effect on the front right side of the display screen. Therefore, the display screen will not suddenly detach due to the unexpected failure of the elastic reset component, providing additional safety for equipment maintenance and operation.

[0046] Furthermore, card printers using this detachable display screen fixing mechanism feature a quick-detachable display screen, facilitating easy operation by separating the screen for use in portable scenarios. During device movement and carrying, the display screen remains stable and undisturbed thanks to this fixing mechanism, offering 60% improved stability compared to traditional snap-fit ​​structures. The overall lifespan of the mechanism is extended to over 5 years (compared to approximately 3 years for traditional structures), ensuring device reliability and user experience. The display screen can be quickly detached from the main body of the card printer, allowing for easy handling in confined spaces or special operating scenarios, enhancing the adaptability of portable card printers across various application scenarios.

[0047] It should be noted that in this field, the design of display screen fixing structures has long been subject to a certain technical convention: those skilled in the art generally believe that to ensure the stability of the display screen under the vibration conditions of portable device movement, multiple fixing points symmetrically distributed on at least two opposite sides of the display screen must be set to prevent the display screen from loosening by applying force evenly at multiple points. Limited by this technical bias, existing display screen fixing mechanisms all adopt a symmetrical design approach of full-snap multi-point fixing or circumferential screw fastening, and no one has attempted to use an asymmetrical structure of single-sided fixing + single-sided movement. This invention breaks the above technical convention by using the permanent positioning accuracy of an integrated inverted buckle to replace the clamping force of elastic snaps, and using the unidirectional locking of a single-sided sliding buckle and the limiting of the rear positioning wall to jointly form a statically determinate constraint, thereby achieving ultimate convenience of single-sided operation while ensuring stability.

[0048] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A detachable display screen fixing mechanism, characterized in that, include: The main body (5) has a display screen mounting cavity (51), the display screen mounting cavity (51) has a rear positioning wall (511) and a front opening (512) opposite to the rear positioning wall (511); at least one buckle (52) is provided on one side of the display screen mounting cavity (51), the buckle (52) is used to engage and position with one side edge of the display screen (4); The sliding buckle (1) is movably installed on the main body (5) on the opposite side of the display screen mounting cavity (51) and can slide between a locked position and an unlocked position relative to the main body (5). The sliding buckle (1) is provided with a buckle protrusion (11) that is adapted to the opposite edge of the display screen (4). An elastic reset member (2) is disposed between the main body (5) and the sliding buckle (1) for applying an elastic force to the sliding buckle (1) to move toward the locked position. A fixed bracket (3) is placed on the sliding buckle (1) and the elastic reset member (2) and is fixedly connected to the main body (5) to restrict the sliding buckle (1) from moving only in the sliding direction.

2. The detachable display screen fixing mechanism according to claim 1, characterized in that, The inverted buckle (52) is integrally formed on the main body (5).

3. The detachable display screen fixing mechanism according to claim 1, characterized in that, The elastic reset member (2) is a pressure spring. The main body (5) has a sliding buckle mounting groove (53) on the opposite side of the display screen mounting cavity (51). The sliding buckle (1) is embedded in the sliding buckle mounting groove (53). The elastic reset member (2) is arranged along the sliding direction of the sliding buckle (1). One end of the elastic reset member (2) abuts against the fixed bracket (3) or the main body (5), and the other end abuts against the sliding buckle (1).

4. The detachable display screen fixing mechanism according to claim 3, characterized in that, The end of the sliding buckle (1) opposite to the buckle protrusion (11) is provided with a spring positioning protrusion (12), and one end of the elastic reset member (2) is sleeved on the corresponding spring positioning protrusion (12); a spring baffle (54) is integrally formed on the rear side of the main body (5), and the other end of the elastic reset member (2) abuts against the spring baffle (54).

5. The detachable display screen fixing mechanism according to claim 3, characterized in that, The inner wall of the sliding buckle mounting groove (53) is provided with one of a guide bar (57) and a guide groove (15), and the sliding buckle (1) is provided with the other of the guide bar (57) and the guide groove (15). The guide bar (57) is adapted to be embedded in the guide groove (15) to guide the sliding of the sliding buckle (1) and limit the displacement of the sliding buckle (1) in the vertical direction.

6. The detachable display screen fixing mechanism according to claim 3, characterized in that, The fixed bracket (3) is installed on the rear side of the main body (5), so that the elastic reset member (2) is hidden between the fixed bracket (3) and the rear side of the main body (5), and a sliding limiting groove (3-5) is formed between the fixed bracket (3) and the rear side of the main body (5) for the sliding buckle (1) to extend into.

7. The detachable display screen fixing mechanism according to claim 3 or 6, characterized in that, The sliding buckle (1) has an integrally protruding sliding limit piece (13) on its rear side. A sliding limit clearance groove (62) is reserved on the fixed bracket (3) or the main body (5) or between the two. The sliding limit piece (13) extends into the sliding limit clearance groove (62). When the sliding buckle (1) slides relative to the main body (5), the sliding limit piece (13) slides synchronously in the sliding limit clearance groove (32).

8. The detachable display screen fixing mechanism according to claim 1, characterized in that, The front side of the sliding buckle (1) is provided with an operating part (14) for the operator to manually push the sliding buckle (1) from the locked position to the unlocked position.

9. A card printer, comprising a card printer body (100) and a display screen (4) disposed on the card printer body (100), characterized in that, The display screen (4) is mounted on the card printer body (100) by a detachable display screen fixing mechanism as described in any one of claims 1 to 9.

10. A method for disassembling and assembling a display screen, characterized in that, Includes the following steps: Provide a main body (5), the main body having a display screen mounting cavity (51), the display screen mounting cavity (51) having a rear positioning wall (511) and a front opening (512), and a buckle (52) is provided on one side of the display screen mounting cavity (51). Insert the display screen (4) into the display screen mounting cavity (51) through the front opening (512), so that one side edge of the display screen (4) engages with the buckle (52) for positioning, and the rear edge of the display screen (4) abuts against the rear positioning wall (511). The elastic reset member (2) drives the sliding buckle (1) to slide from an unlocked position to a locked position, so that the buckle protrusion (11) on the sliding buckle (1) engages and locks with the other opposite edge of the display screen (4), thereby fixing the display screen (4) to the main body (5). When the display screen (4) needs to be removed, the elastic force of the elastic reset member (2) is overcome to push the sliding buckle (1) from the locked position to the unlocked position, so that the buckle protrusion (11) is disengaged from the other opposite edge of the display screen (4), and the display screen (4) can be removed from the front opening (512). The sliding buckle (1) is restricted to move only in the sliding direction by the fixed bracket (3).

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