Self-balancing peeling mechanism portable printer

Abstract

The application discloses a self-balancing peeling mechanism portable printer and relates to the technical field of printing equipment. The self-balancing peeling mechanism portable printer comprises a printer body and a peeling mechanism, and the peeling mechanism comprises a positioning clamping piece, a movable cover plate and a peeling rotating shaft. A peeling roller and a W-shaped torsional spring are arranged in the movable cover plate, the W-shaped torsional spring is sleeved with the movable cover plate, two ends of the W-shaped torsional spring are connected with the peeling roller, and the two sides can be automatically balanced. The center of the peeling roller is located below a common axis of a rubber roller and the peeling rotating shaft, a geometric self-locking structure is formed, and stable closing can be realized without complex locking pieces. The application solves the problems of uneven pressure, complex structure and high cost of the existing peeling mechanism, realizes pressure self-balancing and compact structure, adapts to the miniaturization and light weight requirements of the portable printer, and improves printing stability and assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, specifically to a portable printer with a self-balancing peeling mechanism. Background Technology

[0002] Portable printers, with their compact size, lightweight design, portability, and ease of use in the field, are widely used in various scenarios such as logistics and express delivery waybill printing, retail invoice printing, mobile office document printing, medical field record printing, and warehouse barcode label printing. In practical use, portable printers often need to continuously and stably complete the printing and peeling of labels, invoices, waybills, and other media. Therefore, the performance of the peeling mechanism directly determines the overall print quality, operational stability, lifespan, and user experience of the printer.

[0003] The peeling mechanisms of most existing portable printers adopt traditional structures, and their core defects are mainly concentrated in the pressure supply method, opening and closing structure, manufacturing and assembly costs, and operational reliability. They can no longer meet the comprehensive requirements of high performance, small size, low cost, and high reliability of current portable printers.

[0004] Firstly, traditional peeling mechanisms typically rely on multiple independent springs to supply pressure, each acting on one side of the peeling roller. Due to individual variations in spring manufacturing, the free length, wire diameter, number of coils, and elastic coefficient of each spring are difficult to match perfectly. This results in significant pressure deviations between the two sides after assembly, making it difficult to guarantee pressure consistency. During operation, it is highly prone to situations where one side experiences excessive or insufficient pressure: excessive pressure on one side can cause problems such as overly tight media peeling, damage to the backing paper, label tearing, and paper jams; insufficient pressure on one side can lead to incomplete peeling of the media from the backing paper, label adhesion, blurry printing, and skewed paper feed. These issues severely compromise the stability of the peeling process, reduce the yield rate of printed products, and affect normal user operation.

[0005] Secondly, the opening and closing function of traditional peeling mechanisms is achieved by a combination of multiple independent parts, typically including individual latches, locking pins, return springs, positioning sliders, and linkage rods. The stacking of numerous parts not only makes the overall structure complex and assembly cumbersome, but also results in a large space occupied by the peeling mechanism and a bulky overall size. Portable printers have strict limitations on internal space and overall dimensions; a complex and bulky peeling mechanism directly hinders the goals of miniaturization and lightweight design, reduces portability, and does not meet the needs of mobile work scenarios.

[0006] Secondly, traditional stripping mechanisms require extremely high manufacturing and assembly precision for each component to ensure stable pressure, reliable opening and closing, and smooth operation. For example, key components such as spring mounting seats, roller shaft holes, locking slots, and linkage rods typically need to be controlled at IT7 level or even higher precision to reduce assembly gaps, prevent jamming, and ensure uniform force distribution. High-precision machining inevitably leads to a significant increase in component manufacturing costs. Simultaneously, the assembly process for multiple components is cumbersome, requiring multiple positioning, calibration, and debugging steps, resulting in high assembly difficulty, time consumption, and labor costs. Furthermore, the assembly of multiple components inevitably generates cumulative errors. When these cumulative errors exceed the allowable range, they further exacerbate problems such as uneven pressure, jamming during opening and closing, abnormal operating noises, and decreased yield, indirectly increasing subsequent maintenance costs.

[0007] Finally, traditional peeling mechanisms lack reliable self-locking and dedicated tearing mechanisms: in the closed state, they rely on independent latches, pins, and other parts for positioning, and are prone to accidentally popping open when the locking parts are worn, loose, or misaligned, resulting in poor reliability; after printing, the media backing paper does not have a dedicated tearing cut, making it difficult for users to tear the paper, resulting in uneven cuts, and easily leading to backing paper residue, label wrinkles, and other issues, resulting in a poor user experience.

[0008] In summary, existing portable printer peeling mechanisms suffer from a series of technical defects, including uneven pressure supply, complex and bulky structure, high manufacturing and assembly costs, low assembly efficiency, large cumulative errors, low yield rate, poor reliability, and the lack of a dedicated paper-tearing mechanism. These defects prevent a balance between pressure stability, structural compactness, economy, reliability, and user experience, severely hindering the performance improvement and market competitiveness of portable printers. Therefore, developing a portable printer with a self-balancing peeling mechanism that achieves pressure self-balancing, highly integrated structure, strong fault tolerance, low manufacturing and assembly costs, reliable opening and closing, and convenient paper tearing has become a pressing technical challenge for those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a portable printer with a self-balancing peeling mechanism to solve the problems mentioned in the background art. Existing peeling mechanisms use multiple independent springs for pressure application, resulting in inconsistent spring performance, large pressure deviations on both sides, and poor pressure stability, which in turn leads to problems such as media tearing, adhesion, paper jams, and blurry printing. Existing peeling mechanisms rely on multiple parts for opening and closing, resulting in complex structures, numerous parts, and large space requirements, hindering the miniaturization and lightweight design of portable printers. Existing peeling mechanisms have excessively high requirements for parts manufacturing and assembly precision, leading to high processing costs, cumbersome assembly processes, low assembly efficiency, large cumulative errors in multi-part assembly, and low yield rates. Existing peeling mechanisms lack a reliable self-locking structure, relying on independent locking components for fixation, which are prone to wear and loosening, and accidental opening, resulting in poor operational reliability. Existing peeling mechanisms lack a dedicated paper-tearing structure, making paper tearing difficult after printing, resulting in uneven cuts, and easy residue of the bottom paper, leading to a poor user experience.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a portable printer with a self-balancing peeling mechanism, comprising a printer body and a peeling mechanism. The peeling mechanism is snapped onto the top of the printer body. The peeling mechanism includes a positioning clip, a movable cover plate, and a peeling shaft. The positioning clip is used to fix the printer body, and a rubber roller is inserted into the inner side of the positioning clip. The movable cover plate is snapped onto the inner side of the positioning clip. A peeling roller and a W-arm torsion spring are provided on the inner side of the movable cover plate. The left and right ends of the peeling roller are respectively sleeved on the left and right ends of the W-arm torsion spring, and the middle part of the W-arm torsion spring is hinged to the movable cover plate. The peeling shaft is inserted into the inner side of the movable cover plate, and both ends of the peeling shaft penetrate the movable cover plate and are inserted into the inner side of the positioning clip. The rubber roller and the peeling roller are tangential, and the W-arm torsion spring pushes the peeling roller to abut tightly against the rubber roller. The center of the peeling roller is located below the common axis of the rubber roller and the peeling shaft, forming a geometrically self-locking structure.

[0011] Preferably, the top of the printer body has a groove.

[0012] Preferably, the peeling mechanism is inserted into the inner side of the groove and is fixedly engaged with the groove.

[0013] Preferably, positioning plates are fixedly connected to both sides of the positioning card. The positioning plates are L-shaped, with one end horizontally set and having a screw hole. They are fixedly connected to the printer body by bolts inserted into the screw hole.

[0014] Preferably, the positioning clip has an arc-shaped slot on its outer side, the arc-shaped slot being located on the outer side of the positioning plate, and a slot is formed on the top of the positioning clip, the slot being deeper on the side closer to the rubber roller and shallower on the side farther from the rubber roller. A positioning hole is formed on the inner side of the slot, and the positioning hole is sleeved on the outer sides of both ends of the peeling shaft.

[0015] Preferably, one end of the rubber roller passes through the positioning clip and is connected to a linkage gear on the outside. The linkage gear is used to drive the rubber roller to rotate by a linkage drive device.

[0016] Preferably, a bottom cover is snapped onto the bottom of the movable cover plate, and a bolt is inserted into the inner side of the bottom cover plate to fix it to the movable cover plate. Positioning stops are fixedly provided on the outer sides of both ends of the movable cover plate. The positioning stops are inserted into the inner side of the arc-shaped slot and are slidably snapped into the arc-shaped slot.

[0017] Preferably, the movable cover plate has through holes on the outer sides at both ends, and an arc-shaped groove on the inner side of the movable cover plate. A straight tearing paper cut is provided on the side of the arc-shaped groove away from the movable cover plate.

[0018] Preferably, the inner side of the arc-shaped groove is in communication with the through hole, the arc-shaped groove is engaged with the outer side of the peeling shaft and is rotatably engaged with the peeling shaft, and both ends of the peeling shaft pass through the through hole to the outside.

[0019] Preferably, a limit block and a shaft are fixedly connected to the inner side of the movable cover plate. A screw hole is provided on the inner side of the shaft to fit a bolt on the movable cover plate. A W-arm torsion spring is sleeved on the outer side of the shaft. The W-arm torsion spring is provided with a helical section and an extension section. The extension section is fixedly connected to both sides of the helical section. The extension section and the helical section form a W-shaped structure. The helical section is sleeved on the outer side of the shaft.

[0020] Preferably, the peeling roller is inserted into the inner side of the movable cover plate, and bushings are sleeved on the outer sides of both ends of the peeling roller. A sleeve plate extends radially on the outer side of the bushing, and a first limiting slot and a second limiting slot are provided on the sleeve plate.

[0021] Preferably, the second limiting slot is far from the bushing body, the second limiting slot is sleeved on the end of the extension of the W-arm torsion spring and slidably connected to it, the first limiting slot is located between the second limiting slot and the bushing body, the first limiting slot is sleeved on the outside of the limiting block and slidably connected to the limiting block.

[0022] The technical effects and advantages of this invention are as follows: 1. This portable printer with a self-balancing peeling mechanism abandons the traditional multi-independent spring pressure mode and adopts an integrated W-arm torsion spring that connects the two ends of the peeling roller bidirectionally. The helical section in the middle of the torsion spring is sleeved on the movable cover plate to form a rotation fulcrum. During operation, the torque generated by the torsion spring is synchronously and evenly transmitted to both ends of the peeling roller through the two extended sections, automatically adjusting and balancing the pressure on both sides, eliminating the problem of uneven pressure at the source. Even if there are minor manufacturing errors in the parts or slight deformation of the main structure, the W-arm torsion spring can adaptively compensate through its own elastic deformation, ensuring that the pressure at both ends of the peeling roller remains consistent, avoiding excessive or insufficient pressure on one side, and greatly improving the stability of the peeling process and the printing quality.

[0023] 2. This self-balancing peeling mechanism for portable printers features a W-arm torsion spring with adaptive compensation capabilities. It exhibits good tolerance for manufacturing tolerances of parts, assembly gaps, and minor deformations of the main structure, eliminating the need for extremely high machining precision. Lower precision requirements directly simplify the manufacturing process, reduce scrap rates, and lower parts manufacturing costs. Simultaneously, relaxed assembly tolerances reduce assembly calibration and debugging processes, lowering assembly difficulty and labor costs, effectively addressing the pain points of traditional technologies: high precision, high cost, and low yield.

[0024] 3. This self-balancing peeling mechanism portable printer innovatively proposes a geometric self-locking opening and closing principle. The central axis of the peeling roller is positioned below the line connecting the central axis of the rubber roller and the central axis of the peeling shaft, forming a specific geometric layout. In the closed state, the W-arm torsion spring applies a forward thrust to the rubber roller on the peeling roller. As the rubber roller rotates, it generates a tangential frictional force on the peeling roller. The interaction of these two forces creates a self-locking torque, preventing the movable cover from accidentally opening and achieving stable closure and locking. It eliminates the need for traditional independent latches, pins, and return springs; self-locking is achieved solely through the relative positions and force relationships of the core components. This significantly reduces the number of parts, highly integrates the structure, occupies less space, and ensures high opening and closing reliability. It completely avoids the problem of accidental opening caused by wear, loosening, or failure of locking components, improving the overall reliability of the machine.

[0025] 4. The self-balancing peeling mechanism of this portable printer reduces the number of parts through geometric self-locking design, resulting in a simple and compact overall structure with significantly reduced space occupation. The overall size of the peeling mechanism is reduced, allowing it to be perfectly embedded in the narrow internal space of a portable printer. The simplified structure also reduces the weight of the entire machine, greatly improving portability.

[0026] 5. The self-balancing peeling mechanism of this portable printer uses an integrated W-arm torsion spring to replace multiple independent springs and a geometric self-locking mechanism to replace multiple locking parts and connecting rods. This significantly reduces the number of vulnerable parts and potential failure points, thereby reducing the failure rate from the source and extending the service life of the entire machine.

[0027] 6. This self-balancing peeling mechanism portable printer features a straight-line tearing cut at the rear of the peeling component, which helps to quickly and smoothly remove the backing paper after the printing peeling operation is completed, making operation convenient. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the peeling mechanism of the present invention; Figure 4 This is a schematic diagram of the positioning card component of the present invention; Figure 5 This is a schematic diagram of the structure of the movable cover plate of the present invention; Figure 6 This is a schematic diagram of the internal structure of the movable cover plate of the present invention; Figure 7 This is a side view of the peeling mechanism of the present invention; Figure 8 This is a partial cross-sectional structural diagram of the peeling mechanism of the present invention.

[0030] In the picture: 1. Printer body; 2. Stripping mechanism; 21. Positioning clip; 211. Positioning plate; 212. Arc-shaped groove; 213. Positioning hole; 214. Rubber roller; 215. Linkage gear; 22. Movable cover plate; 221. Bottom cover; 222. Positioning stop; 223. Through hole; 224. Arc-shaped groove; 2241. Straight paper tearing cut; 225. Limiting block; 226. Peeling roller; 227. Bushing; 2271. First limiting slot; 2272. Second limiting slot; 228. Shaft; 229. W-arm torsion spring; 23. Peel off the shaft. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention discloses a portable printer with a self-balancing peeling mechanism, according to the attached... Figures 1-8 As shown, it includes a printer body 1 and a peeling mechanism 2. The peeling mechanism 2 is a core innovative component. It is stably assembled on the top of the printer body 1 by a snap-fit ​​method. It has a compact structure, is easy to assemble and disassemble, and is suitable for portable scenarios.

[0033] Furthermore, the printer body 1, serving as the basic carrier of the entire machine, is injection molded from lightweight engineering plastic material. Its overall shape is compact and square, with rounded corners, comfortable to hold, and easy to carry. A groove is provided on the top of the printer body 1, the size of which precisely matches the bottom shape of the peeling mechanism 2. The peeling mechanism 2 is inserted into the inside of the groove and fixedly connected to it via a snap-fit ​​structure, enabling quick assembly, disassembly, and maintenance of the peeling mechanism 2 and the printer body 1. The assembly is secure and not easily loosened. The printer body 1 integrates conventional components such as a drive motor, control motherboard, power module, and paper feed path. The drive motor provides rotational power to the rubber roller 214 via gear transmission. The control motherboard is responsible for overall printing control, parameter adjustment, and signal transmission. The power module provides power to the entire machine, and the paper feed path ensures smooth media transport. All of these components are existing mature technologies and will not be described in detail here.

[0034] Furthermore, the peeling mechanism 2 is the core innovative component of this invention. It adopts a modular design and is mainly composed of three core components: positioning clip 21, movable cover plate 22, and peeling shaft 23. It is supplemented by other components such as rubber roller 214, linkage gear 215, bottom cover 221, positioning stop 222, limit block 225, peeling roller 226, bushing 227, shaft 228, and W-arm torsion spring 229. It has a simple structure, efficient assembly, and complete functions.

[0035] Furthermore, the positioning clip 21 serves as the fixed base for the peeling mechanism 2. It is made of high-strength engineering plastic material and is integrally injection molded, resulting in a strong structural rigidity, resistance to deformation, and a long service life. The positioning clip 21 has an overall U-shaped frame structure with symmetrical L-shaped positioning plates 211 on both sides. One end of the positioning plate 211 extends horizontally and has a screw hole. Bolts pass through the screw hole and are fixedly connected to the inner side of the groove on the top of the printer body 1. The L-shaped structure increases the connection contact area, improves connection stability, and prevents the peeling mechanism 2 from shaking or loosening during operation.

[0036] Furthermore, symmetrical arc-shaped slots 212 are formed on the outer walls of both sides of the positioning clip 21. These arc-shaped slots 212 are elongated arc-shaped grooves located on the outer side of the positioning plate 211. They are used to cooperate with the sliding of the positioning stop 222 of the movable cover plate 22, providing guidance and travel restriction for the movable cover plate 22 to rotate around the peeling shaft 23, ensuring smooth opening and closing without jamming. A slot is formed on the inner top side of the positioning clip 21. The slot has a stepped cross-section, deeper on the side closer to the rubber roller 214 and shallower on the side farther from the rubber roller 214. This design facilitates quick positioning and fitting of the movable cover plate 22 when closed, preventing displacement or misalignment. Positioning holes 213 are symmetrically formed at both ends of the slot. These positioning holes 213 are circular through holes with a diameter precisely matched to the outer diameter of the peeling shaft 23. They are used to fit the two ends of the peeling shaft 23, achieving a fixed assembly between the peeling shaft 23 and the positioning clip 21, ensuring the stability and stability of the peeling shaft 23.

[0037] Furthermore, a rubber roller 214 is laterally inserted into the inner side of the positioning clip 21. The rubber roller 214 is a cylindrical roller body with a metal core shaft covered by rubber material. It has a moderate coefficient of friction, is wear-resistant and durable, and is not prone to aging. It is used to transport the media and cooperates with the peeling roller 226 to complete the peeling action. One end of the rubber roller 214 extends through the outer wall of the positioning clip 21 to the outside, and a linkage gear 215 is fixedly inserted into the end. The linkage gear 215 is a metal spur gear that meshes with the gear on the output shaft of the drive motor inside the printer body 1. When the drive motor is running, it drives the rubber roller 214 to rotate synchronously through gear transmission, providing stable power for media transport and peeling.

[0038] Furthermore, the movable cover plate 22 is a movable opening and closing component of the peeling mechanism 2. It is integrally injection molded from lightweight engineering plastic material, with an overall arc-shaped cover structure, smooth appearance, lightweight structure, and convenient opening and closing. The movable cover plate 22 is snapped into the inside of the positioning clip 21 and can rotate freely around the peeling shaft 23, realizing the switching between closed locking and open maintenance states. The bottom of the movable cover plate 22 is snapped into the bottom cover 221. The bottom cover 221 has a flat structure with bolt holes on the inside, and is fixedly connected to the bottom of the movable cover plate 22 by bolts, making the assembly firm and not easy to fall off. The main function of the bottom cover 221 is to close the bottom opening of the movable cover plate 22, protect the internal W-arm torsion spring 229, peeling roller 226 and other components, prevent dust, paper scraps and debris from entering the interior and causing jamming and wear, and at the same time facilitate the assembly, disassembly and maintenance of internal components.

[0039] Furthermore, symmetrical positioning stops 222 are fixedly provided on the outer sides of both ends of the movable cover plate 22. The positioning stops 222 are cylindrical protrusions with an outer diameter that precisely matches the width of the arc-shaped slot 212. They are inserted into the inner side of the arc-shaped slot 212 and slidably engaged with it. When the movable cover plate 22 rotates around the peeling shaft 23, the positioning stops 222 slide along the inner wall of the arc-shaped slot 212, limiting the rotation stroke of the movable cover plate 22, preventing excessive rotation and offset, and ensuring smooth, stable, and precise positioning of the opening and closing action. Symmetrical through holes 223 are provided on the outer sides of both ends of the movable cover plate 22. The through holes 223 are circular through holes with a diameter larger than the outer diameter of the peeling shaft 23, facilitating the through-and-fit assembly of the peeling shaft 23. An arc-shaped groove 224 is provided on the inner side of the movable cover plate 22. The arc-shaped groove 224 is an arc-shaped groove with an arc that matches the outer diameter of the peeling shaft 23. The inner side is connected to the through hole 223 and is engaged with the outer side of the peeling shaft 23 and rotates to engage with it, so that the movable cover plate 22 can rotate flexibly around the peeling shaft 23 without jamming.

[0040] Furthermore, a straight tear-off slit 2241 is provided on the side of the arc-shaped card slot 224 away from the movable cover plate 22. The straight tear-off slit 2241 is a straight opening with a sharp opening and flat edges. After the printing and peeling operation is completed, the media backing paper naturally extends to the straight tear-off slit 2241. Users can easily and smoothly tear off the backing paper along the slit. The cut is neat, without residue or wrinkles, which greatly improves the convenience of operation and user experience. The inner side of the movable cover plate 22 is fixedly connected to the limiting block 225 and the shaft 228: the limiting block 225 is a cylindrical protrusion, which is vertically fixed to the inner wall of the movable cover plate 22. It is used to cooperate with the sliding of the first limiting slot 2271 of the bushing 227 to limit the radial displacement of the peeling roller 226 and ensure the stability of the movement trajectory; the shaft 228 is a short cylindrical rod with a screw hole on the inner side. It is fixed to the inner wall of the movable cover plate 22 by bolts, and a W-arm torsion spring 229 is sleeved on the outer side as a torsion spring mounting fulcrum to ensure the stable rotation of the torsion spring.

[0041] Specifically disclosed, the W-arm torsion spring 229 is the core elastic pressure-applying component, made of high-elasticity stainless steel, featuring good elasticity, high strength, fatigue resistance, resistance to deformation, and long service life. The W-arm torsion spring 229 has an overall W-shaped structure, consisting of a central helical section and two side extension sections: the helical section has a multi-turn helical structure, sleeved on the outside of the shaft 228, with the middle part hinged to the movable cover plate 22 to form a stable rotation fulcrum; the extension sections are straight rods, symmetrically fixed to both sides of the helical section, extending outward and connecting to both ends of the peeling roller 226. The torque of the helical section is synchronously transmitted to both ends of the peeling roller 226 through the extension sections, achieving pressure self-balancing.

[0042] Specifically disclosed, the peeling roller 226 is a cylindrical roller body made of wear-resistant engineering plastic material. It has a smooth surface, moderate hardness, and is wear-resistant and durable. It is used in conjunction with the rubber roller 214 to complete the media peeling action. The peeling roller 226 is inserted laterally into the inner side of the movable cover plate 22, and the left and right ends are symmetrically fitted with bushings 227. The bushings 227 are cylindrical sleeves made of wear-resistant metal material. They have smooth inner walls and strong wear resistance, which can reduce the rotational friction of the peeling roller 226 and extend its service life.

[0043] Specifically disclosed, the bushing 227 has a sleeve plate extending radially outward. The sleeve plate has a flat plate structure and symmetrically opens a first limiting slot 2271 and a second limiting slot 2272. The second limiting slot 2272 is far away from the body of the bushing 227 and is an elongated slot. It is sleeved on the end of the extension section of the W-arm torsion spring 229 and slidably connected to it. The extension section of the torsion spring can adaptively slide and adjust the pressure within the slot. The first limiting slot 2271 is located between the second limiting slot 2272 and the body of the bushing 227. It is an elongated slot and is sleeved on the outside of the limiting block 225 and slidably connected to it. It restricts the radial displacement of the peeling roller 226, ensures the stability of the movement trajectory, and prevents deviation and jamming.

[0044] Specifically disclosed, the peeling shaft 23 is a cylindrical long shaft made of high-strength metal material, which is strong, rigid, and not easily bent or deformed, serving as the rotation fulcrum of the movable cover plate 22. The peeling shaft 23 is horizontally inserted into the inner side of the movable cover plate 22, with both ends extending outwards through the through holes 223 of the movable cover plate 22, and precisely inserted into the inner side of the positioning holes 213 of the positioning clip 21. It is fixedly connected to the positioning clip 21 and rotatably engaged with the movable cover plate 22, ensuring that the movable cover plate 22 rotates flexibly and stably around the peeling shaft 23.

[0045] It is particularly important to emphasize that one of the core innovations of this invention is the geometric self-locking structure, the key of which lies in the specific positional relationship between the rubber roller 214, the peeling roller 226, and the peeling shaft 23: in the closed working state, the central axis of the peeling roller 226 is located below the virtual straight line formed by the central axis of the rubber roller 214 and the central axis of the peeling shaft 23. This specific geometric layout provides the basis for the realization of the self-locking function.

[0046] It is particularly important to emphasize that the rubber roller 214 and the peeling roller 226 are tangential. The W-arm torsion spring 229 continuously generates torque, pushing the peeling roller 226 and the rubber roller 214 to fit tightly and without gaps, ensuring uniform and stable force during media peeling.

[0047] Working principle: Assembly process: Align the positioning clip 21 of the peeling mechanism 2 with the top groove of the printer body 1 via the L-shaped positioning plate 211, and fix it with bolts; sleeve the spiral section of the W-arm torsion spring 229 on the shaft 228, and insert the end of the extension section into the second limiting slot 2272 of the bushings 227 at both ends of the peeling roller 226; sleeve the bushings 227 of the peeling roller 226 on the outside of the limiting block 225 via the first limiting slot 2271; align the arc-shaped slot 224 of the movable cover plate 22 with the peeling shaft 23, rotate it around the peeling shaft 23 to close it, and the positioning stop 222 is engaged in the arc-shaped slot 212 to complete the assembly.

[0048] Self-balancing pressure principle: During printing, the internal drive motor of the printer body 1 starts, driving the rubber roller 214 to rotate at a constant speed through the linkage gear 215, and the conveying medium enters between the rubber roller 214 and the peeling roller 226. The spiral section of the W-arm torsion spring 229 generates stable torque, which is synchronously and evenly transmitted to both ends of the peeling roller 226 through the extension sections on both sides, pushing the peeling roller 226 to be tightly tangential to the rubber roller 214. When the peeling roller 226 is subjected to excessive force on one side, the extension section of the W-arm torsion spring 229 undergoes slight elastic deformation, automatically adjusting the pressure of the extension sections on both sides to keep the pressure at both ends balanced, offsetting the effect of abnormal force on one side; at the same time, the torsion spring adaptively compensates for manufacturing errors of parts, assembly gaps, and minor deformations of the main structure, ensuring that the pressure at both ends of the peeling roller 226 is stable and consistent, ensuring a stable peeling process and excellent printing quality.

[0049] Geometric self-locking principle: In the closed working state, the central axis of the peeling roller 226 is located below the common axis of the rubber roller 214 and the peeling shaft 23, forming a self-locking geometric layout. The W-arm torsion spring 229 applies a forward thrust to the rubber roller 214 on the peeling roller 226. When the rubber roller 214 rotates, it generates a tangential frictional force on the peeling roller 226. The interaction of these two forces forms a self-locking torque that prevents the movable cover plate 22 from opening accidentally. The magnitude of the self-locking torque is positively correlated with the torsion spring torque and the tangential frictional force of the rubber roller 214. It can completely offset the weight of the movable cover plate 22 itself, external vibration, and the pulling force of the medium. Without the need for additional locking devices such as latches or pins, the movable cover plate 22 can be kept in a stable closed and locked state, preventing accidental opening and ensuring extremely high operational reliability.

[0050] Opening and closing operation: When the peeling mechanism 2 needs to be opened, manually lift the movable cover plate 22 upwards. The movable cover plate 22 rotates around the peeling shaft 23, and the positioning stop 222 slides along the arc-shaped slot 212. The W-arm torsion spring 229 is passively compressed, and the peeling roller 226 separates from the rubber roller 214. When closing, press the movable cover plate 22 downwards. The W-arm torsion spring 229 is passively compressed, and the peeling roller 226 is pressed under the rubber roller 214. The W-arm torsion spring 229 pushes the peeling roller 226 to re-adhere to the rubber roller 214, entering a self-locking state. The operation is convenient.

[0051] Paper tearing operation: After the printing peeling operation is completed, the media backing paper extends to the straight tearing cut 2241. The user can smoothly tear off the backing paper along the straight tearing cut 2241, which helps to remove the backing paper quickly and flat after the printing peeling operation is completed, making the operation convenient.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A portable printer with a self-balancing peeling mechanism, characterized in that, include: Printer body (1); Peeling mechanism (2), which is snapped onto the top of printer body (1), includes positioning clip (21), movable cover plate (22) and peeling shaft (23). Positioning clip (21) is used to fix the printer body (1). A rubber roller (214) is inserted into the inner side of positioning clip (21). The movable cover plate (22) is snapped into the inside of the positioning clip (21). The inside of the movable cover plate (22) is provided with a peeling roller (226) and a W-arm torsion spring (229). The left and right ends of the peeling roller (226) are respectively sleeved on the left and right ends of the W-arm torsion spring (229). The middle part of the W-arm torsion spring (229) is positioned and hinged to the movable cover plate (22). The peeling shaft (23) is inserted into the inside of the movable cover plate (22), and both ends of the peeling shaft (23) penetrate the movable cover plate (22) and are inserted into the inside of the positioning clip (21); The rubber roller (214) and the peeling roller (226) are tangential, and the W-arm torsion spring (229) pushes the peeling roller (226) to abut against the rubber roller (214). The center of the peeling roller (226) is located below the common axis of the rubber roller (214) and the peeling shaft (23), forming a geometric self-locking structure.

2. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The top of the printer body (1) has a groove.

3. A portable printer with a self-balancing peeling mechanism according to claim 2, characterized in that, The peeling mechanism (2) is inserted into the inside of the groove and is fixedly engaged with the groove.

4. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The positioning card (21) is fixedly connected to positioning plates (211) on both sides. The positioning plates (211) are L-shaped, with one end horizontally set and having a screw hole. They are fixedly connected to the printer body (1) by bolts inserted into the screw hole.

5. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The positioning clip (21) has an arc-shaped slot (212) on its outer side, which is located on the outer side of the positioning plate (211). The positioning clip (21) has a slot on its top, which is deeper on the side closer to the rubber roller (214) and shallower on the side farther from the rubber roller (214). The slot has a positioning hole (213) on its inner side, which is fitted onto the outer sides of both ends of the peeling shaft (23).

6. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, One end of the rubber roller (214) passes through the positioning clip (21) and is connected to the outer side by a linkage gear (215). The linkage gear (215) is used to drive the rubber roller (214) to rotate.

7. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The bottom of the movable cover plate (22) is snapped with a bottom cover (221). The bottom cover (221) is inserted with bolts and fixedly connected to the movable cover plate (22). Positioning stops (222) are fixedly provided on the outer sides of both ends of the movable cover plate (22). The positioning stops (222) are inserted into the inner side of the arc-shaped slot (212) and are slidably snapped with the arc-shaped slot (212).

8. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The movable cover plate (22) has through holes (223) on the outer sides at both ends, and an arc-shaped slot (224) is provided on the inner side of the movable cover plate (22). A one-line tearing paper cut (2241) is provided on the side of the arc-shaped slot (224) away from the movable cover plate (22).

9. A portable printer with a self-balancing peeling mechanism according to claim 8, characterized in that, The inner side of the arc-shaped slot (224) is connected to the through hole (223). The arc-shaped slot (224) is engaged with the outer side of the peeling shaft (23) and is rotatably engaged with the peeling shaft (23). Both ends of the peeling shaft (23) pass through the through hole (223) to the outside.

10. A portable printer with a self-balancing peeling mechanism according to claim 1, characterized in that, The movable cover plate (22) is fixedly connected to a limiting block (225) and a shaft (228) on its inner side. The shaft (228) has a screw hole on its inner side to fit the bolt on the movable cover plate (22). A W-arm torsion spring (229) is fitted on the outer side of the shaft (228). The W-arm torsion spring (229) is provided with a helical section and an extension section. The extension section is fixedly connected to both sides of the helical section. The extension section and the helical section form a W-shaped structure. The helical section is fitted on the outer side of the shaft (228).

11. A portable printer with a self-balancing peeling mechanism according to claim 10, characterized in that, The peeling roller (226) is inserted into the inner side of the movable cover plate (22). The outer sides of both ends of the peeling roller (226) are fitted with bushings (227). The bushings (227) have radial extensions of a sleeve plate. The sleeve plate has a first limiting slot (2271) and a second limiting slot (2272).

12. A portable printer with a self-balancing peeling mechanism according to claim 11, characterized in that, The second limiting slot (2272) is away from the body of the bushing (227). The second limiting slot (2272) is sleeved on the end of the extension of the W arm torsion spring (229) and slidably connected to it. The first limiting slot (2271) is located between the second limiting slot (2272) and the body of the bushing (227). The first limiting slot (2271) is sleeved on the outside of the limiting block (225) and slidably connected to the limiting block (225).

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