A portable hand-held inkjet printer

Abstract

This invention discloses a portable handheld inkjet printer, belonging to the field of inkjet printing equipment. The device housing and handle assembly form a recessed cavity, housing the battery and control module, effectively reducing the overall size of the machine. The internal XY bidirectional drive mechanism uses a combination of gear and rack with constant force spring correction and synchronous belt drive, ensuring smooth operation and precise positioning. The ink cartridge connecting block has a universal structure, paired with a replaceable ink cartridge bracket; simply changing the bracket allows for compatibility with various ink cartridge sizes. The ink cartridges employ a cantilever limiting plate, spring, and snap-locking mechanism for easy assembly and disassembly and secure fixation. The device is equipped with a magnetically absorbing, multi-angle rotating display screen, and a camera positioned on the frame facing the printhead for real-time previewing and correction of print errors. The housing integrates USB and RS232 expansion interfaces, supporting data transmission and integration with industrial equipment. This invention features a compact structure, strong versatility, and a balance between printing accuracy and ease of use, making it suitable for various mobile printing scenarios.

Description

Technical Field

[0001] This invention belongs to the technical field of inkjet printing equipment, specifically relating to a portable handheld inkjet printer. Background Technology

[0002] Portable handheld inkjet printers are widely used in various mobile printing scenarios due to their portability and flexibility. However, existing similar products have many drawbacks: low overall space utilization and large size; inconvenient ink cartridge replacement, cumbersome operation, numerous accessories, and high production and maintenance costs.

[0003] Meanwhile, conventional XY drive structures struggle to balance tight space layouts with transmission precision; additionally, traditional ink cartridge holders employ torsion spring hinged limiting structures, which are prone to limiting misalignment, ink cartridge loosening, or even jamming during use. Furthermore, most device displays are fixed, lacking angle adjustment and reliable storage limiting mechanisms. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as low space utilization, poor ink cartridge versatility, unstable transmission, unreliable ink cartridge fixing, and inconvenient display screen use, and to provide a portable handheld inkjet printer with a compact structure, convenient assembly and disassembly, and high printing accuracy.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0006] A portable handheld inkjet printer includes a housing, a grip assembly, an XY bidirectional drive mechanism, an ink cartridge assembly, a control module, a battery, a display screen, and a camera. The grip assembly is assembled with the housing, and the two enclose each other to form a sealed receiving cavity. The battery and control module are integrally arranged inside the receiving cavity to achieve a compact layout. The XY bidirectional drive mechanism and the ink cartridge assembly are both disposed within the housing. The XY bidirectional drive mechanism is disposed on a frame mounting plate and is used to drive the ink cartridge assembly to reciprocate along the plane in the X and Y directions for printing. The display screen is hinged to the housing in a flip-up manner.

[0007] The camera, display screen, XY bidirectional drive mechanism, and control board are electrically connected; the bottom plate of the housing has a printing port for matching ink cartridges; the camera is mounted on the frame mounting plate with the lens facing the printing port, capturing the inkjet image and transmitting it to the display screen via the control module for real-time observation and correction of the printing position; the side wall of the housing has a switch electrically connected to the control board.

[0008] Further optimization includes grip A and grip B, with a plug-in positioning structure between grip A and grip B. After being spliced ​​together by the plug-in positioning structure, the two form a gradually changing hollow grip cavity that is narrow in the middle and gradually widens at both ends. In addition, a snap-fit ​​structure is provided on the outer edge of grip A and grip B, which is snapped to the shell.

[0009] Further optimized, the XY-axis drive mechanism includes an X-axis drive assembly and a Y-axis drive assembly. The X-axis drive assembly includes a first motor, an X-axis guide rod, a gear, and a rack. The first motor is fixedly mounted on the frame mounting plate, the X-axis guide rod is fixed to the back of the frame mounting plate, the gear is fixedly sleeved on the output shaft of the first motor, and the rack is fixedly connected to the Y-axis drive assembly. The gear and rack mesh to drive the entire Y-axis drive assembly to reciprocate along the X-axis guide rod. The Y-axis drive assembly includes a second mounting plate, a second motor, a belt drive assembly, the Y-axis guide rod, and a cartridge connecting block. The rack is fixedly connected to the second mounting plate, and the second motor is fixedly mounted on the second mounting plate. The belt drive assembly includes a driving pulley, a driven pulley, and a synchronous belt. The driving pulley is mounted on the output shaft of the second motor, the driven pulley is mounted on the end of the Y-axis guide rod, and the synchronous belt is sleeved on the driving pulley and the driven pulley, and is fixedly connected to the cartridge connecting block. The second motor drives the cartridge connecting block to reciprocate longitudinally along the Y-axis guide rod through the belt drive assembly.

[0010] Further optimization includes a correction and compensation component, which uses a constant force spring. The constant force spring is located at the end of the frame mounting plate away from the first motor. One end of the constant force spring is fixedly connected to the second mounting plate, and the other end is wound on a horizontal roller on the frame mounting plate. The constant force spring is kept in a continuously tensioned preload state.

[0011] Further optimization involves the ink cartridge connecting block serving as the adapter base for the ink replacement transmission module. The ink cartridge connecting block integrates a first connecting component and a second connecting component. The second connecting component has a through hole with an embedded sliding sleeve and a groove with an inner groove. The groove engages with the teeth of the synchronous belt to achieve universal transmission docking. The connecting block body is slidably fitted onto the guide rod of the Y-axis drive component through the through hole and the sliding sleeve. The first connecting component has a standardized threaded hole on the bottom surface of the connecting block. The bottom surface of the connecting block has a limiting post with coplanar end faces, and the connecting block body has a weight reduction hole or weight reduction cavity.

[0012] Further optimization includes the following: the ink cartridge assembly comprises an ink cartridge bracket and an ink cartridge. The ink cartridge bracket is detachably locked to the ink cartridge connecting block via a first connecting component, forming a replaceable assembly structure. The ink cartridge bracket is a single-sided open frame cavity structure. A single-sided cantilevered limiting plate is installed in the upper space of the cavity, and a direct compression spring is installed in the gap between the limiting plate and the top plate of the ink cartridge bracket. The bottom surface of the limiting plate protrudes towards the ink cartridge to form a first limiting block. A third inclined guide platform with a horizontal limiting platform is symmetrically arranged at the lower end of the side plates on both sides of the ink cartridge bracket. The outer wall of the ink cartridge is provided with a disassembly buckle, and the outer edge of the side plate of the ink cartridge bracket is provided with a buckle mating position. The buckles engage with the buckle mating positions to form a side locking structure. During ink cartridge assembly, its lower end is pre-positioned along the third inclined guide platform. The top limiting protrusion of the ink cartridge presses the limiting plate to compress the spring and then engages with the limiting platform. The pre-tension force of the spring and the side buckles form a double locking structure for the ink cartridge.

[0013] Further optimization involves providing a first inclined working surface and a second inclined working surface on the first limiting block, with the end face of the first limiting block being V-shaped. The first inclined working surface is located on the open side of the cavity, and the second inclined working surface is located on the back plate side of the cavity. The first and second inclined working surfaces are smoothly connected and formed. The first inclined working surface is used for guiding and accommodating during ink cartridge installation, and the second inclined working surface is used for sliding and guiding during ink cartridge disassembly. The two work together to form the snap-fit ​​positioning area of ​​the limiting protrusion at the top of the ink cartridge. A limiting platform is provided at the upper end of the second inclined working surface to support the limiting protrusion and achieve precise positioning after ink cartridge assembly.

[0014] Further optimization involves fixing a PCB contact board to the back plate of the ink cartridge holder. The PCB contact board is electrically connected to the control board via a flexible ribbon cable. The metal contacts of the PCB contact board are connected to the contacts on the surface of the ink cartridge to achieve data interaction between the ink cartridge and the control board.

[0015] Further optimization involves hinged one end of the display screen to the housing, with the housing having a limiting surface; magnets are provided on the back of the display screen and on the limiting surface, and the two work together magnetically to achieve the closing and locking of the display screen; the hinge of the display screen has an arc-shaped second protrusion and multiple sets of second limiting slots, and the second protrusion can be inserted into different slots to fix the display screen at any tilt angle of 5° to 75° or in a horizontal state.

[0016] Further optimization includes an expansion interface and a charging port on the side wall of the housing that are electrically connected to the control board.

[0017] When the machine is in operation, the operator controls the start and stop of the device via the main power switch and imports print data through the expansion interface. The control module drives the XY bidirectional drive mechanism to move the ink cartridge assembly back and forth in the XY direction above the printhead, completing the inkjet operation. The camera captures the print image in real time and previews it simultaneously on the display screen, allowing for real-time correction of print deviations. When changing to different ink cartridge sizes, only the corresponding ink cartridge bracket needs to be replaced; no changes to the drive and connection structure are required.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Reasonable spatial layout and strong portability: The battery and control module are housed in the cavity enclosed by the handle and the shell, making full use of the idle space and reducing the overall size of the device; the split handle adopts a snap-fit ​​screwless assembly, which reduces injection molding defects and avoids damage to the thin-walled shell by screws.

[0020] 2. High cartridge versatility, cost reduction and efficiency improvement: The universal cartridge connector block is used with a replaceable cartridge bracket. Only the bracket needs to be replaced to adapt to multiple cartridge specifications. There is no need to modify the drive structure, reducing the types of accessories and lowering production and after-sales costs.

[0021] 3. High transmission accuracy and smooth operation: The X-axis gear rack is equipped with a constant force spring for correction and to compensate for transmission backlash; the Y-axis synchronous belt and the connecting block tooth groove mesh to prevent slippage. The bidirectional transmission structure complements each other, taking into account both compact layout and positioning accuracy.

[0022] 4. Securely fixed ink cartridges and easy to install and remove: The single-sided cantilever limit plate, combined with the direct pressure spring and side buckle, forms a double locking structure, which abandons the traditional torsion spring structure and eliminates the problems of limit offset and ink cartridge jamming. The multi-level inclined guide allows ink cartridges to be installed and removed without tools, making it suitable for high-frequency ink replacement scenarios.

[0023] 5. Excellent human-machine experience and good protection: The flip-type display screen can be adjusted to multiple angles and is magnetically locked when closed, adapting to different working conditions and preventing damage from shaking during transportation.

[0024] 6. Visual operation for easy calibration: The camera, in conjunction with the display screen, allows for calibration via pre-printing, correcting installation errors of the camera and ink cartridge; in addition, external expansion interfaces enrich the device's expansion capabilities. Attached Figure Description

[0025] Figure 1 A schematic diagram of the overall structure of a portable inkjet printer;

[0026] Figure 2 A schematic diagram of a portable inkjet printer after removing the casing;

[0027] Figure 3 This is a schematic diagram of the overall structure of grip A component of the present invention;

[0028] Figure 4 This is a schematic diagram of the overall structure of grip component B of the present invention;

[0029] Figure 5 A schematic diagram of the assembly structure for combining component A and grip component B;

[0030] Figure 6 A schematic diagram of the drive mechanism for a portable handheld printer;

[0031] Figure 7 Another view of the drive mechanism of a portable handheld printer.

[0032] Figure 8 This is a schematic diagram of the structure of a portable printer ink cartridge connection block;

[0033] Figure 9 This is an assembly structure diagram of the portable printer ink cartridge connecting block and the Y-direction guide rod.

[0034] Figure 10 This is an assembly structure diagram of the portable printer ink cartridge connecting block, Y-axis guide rod, and ink cartridge bracket.

[0035] Figure 11 Front view of a portable printer ink cartridge holder;

[0036] Figure 12 for Figure 11 AA section view;

[0037] Figure 13 for Figure 12 A magnified view of a portion of A;

[0038] Figure 14 This is a perspective view of the portable printer cartridge holder described in this invention;

[0039] Figure 15 This is a schematic diagram of the structure of a portable printer;

[0040] Figure 16 This is a partial view of the connection between the portable printer casing and the display screen.

[0041] Figure 17 for Figure 16 A magnified view of part A in the middle. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions 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, 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.

[0043] Example 1:

[0044] like Figures 1 to 10 As shown, the portable handheld inkjet printer disclosed in this embodiment has a plastic housing 800 as its main body. A stainless steel base plate 810 is sealed at the bottom of the housing, and a long strip-shaped printout 810 is opened in the middle of the base plate, corresponding to the ink outlet end of the ink cartridge 600. A grip assembly 700 is installed on the upper part of the housing, and the grip assembly and the housing together form a sealed receiving cavity, inside which a battery 850 and a control module 860 are placed. A power switch 820, an expansion interface 830, and a charging port are installed on the side wall of the housing. The power switch and the expansion interface are electrically connected to the control module through wires. The expansion interface includes, but is not limited to, a Type-C interface, a USB-A female port, an RS232 serial port, etc.

[0045] A hinged, rotatable display screen 900 is attached to the upper end of the housing. A frame mounting plate 110 is fixed inside the housing. An XY bidirectional drive mechanism is mounted on the frame mounting plate. The frame mounting plate also fixes a camera (not shown in the figure), with the camera lens facing the print port on the base plate vertically. An ink cartridge assembly is also mounted inside the housing and is connected to the XY bidirectional drive mechanism.

[0046] grip components such as Figure 3 , 4 As shown in Figure 5, the grip includes grip A 701 and grip B 702. Both grip A 701 and grip B 702 are integrally injection molded annular thin-walled structures, and the two can be detachably assembled to form a hollow grip body 700. The grip adopts a split structure design, which is suitable for thin-walled plastic injection molding process and effectively reduces production difficulty.

[0047] A plug-in positioning structure is provided at the mating position of grip A part 701 and grip B part 702 to achieve precise splicing and positioning of the two parts. Specifically, the outer edge of the end face of the mating part of grip A part 701 extends integrally along the length direction to form a surrounding plate 7011, which encloses to form a plug-in groove. The mating part of grip B part 702 can be inserted into the plug-in groove to achieve initial plug-in positioning.

[0048] In this embodiment, four notches are spaced apart on the surface of the enclosure 7011, dividing the originally annular enclosure 7011 into four independent structures, so that each enclosure 7011 can produce independent micro-elastic deformation, eliminating the defects of excessive rigidity and large disassembly and assembly resistance of the overall closed enclosure, and adapting to the assembly requirements of thin-walled plastic parts.

[0049] In other embodiments, the enclosure 7011 may be a closed annular plate.

[0050] In this embodiment, a limiting baffle 7021 is provided on the side of the grip B part 702 that is different from the hand-held surface. The limiting baffle 7021 and the side wall of the grip B part 702 itself form an insertion groove 7022. During the splicing and assembly of the grip A part 701 and the grip B part 702, the edge of the segmented surrounding plate 7011 of the grip A part 701 can be correspondingly inserted into the insertion groove 7022 to form a stable interlocking limiting structure, which effectively restricts the relative offset, opening and movement of the two mating ends, and ensures the overall flatness and structural tightness after splicing.

[0051] In this embodiment, a limiting plate is provided only on one side of the grip B component. In other embodiments, multiple limiting plates may be provided along the circumference of the grip B component.

[0052] The plug-in positioning structure is also equipped with a column-shaped centering and anti-detachment component, which consists of a plug-in column 7013 and a hollow tubular sleeve 7023. In this embodiment, the plug-in column 7013 is located on the grip A part 701, and the tubular sleeve 7023 is located on the grip B part 702. Preferably, four plug-in columns 7013 are provided, which are arranged circumferentially around the perimeter of the surrounding plate 7011. Four tubular sleeves 7023 are correspondingly matched. The multi-point uniform cooperation can achieve all-round centering and anti-detachment, improve the balance and stability of the splicing structure, and make the structure compact after assembly. It can be disassembled only by applying external force.

[0053] In other embodiments, the plug-in post and the hollow tubular sleeve can be arranged in various ways to adapt to different product manufacturing needs. For example, the plug-in post 7013 can be located on grip B 702 and the tubular sleeve 7023 can be located on grip A 701; or the plug-in post 7013 and the tubular sleeve 7023 can be arranged on both parts and interlocked. In addition, the number of plug-in posts and hollow tubular sleeves can also be adjusted according to specific circumstances.

[0054] Both grip A 701 and grip B 702 have an integral reinforcing rib 7025 on their sidewalls that are different from the hand grip surface. The reinforcing rib 7025 is arranged in the stress area of ​​the plug structure to specifically reinforce the weak points of the thin-walled structure, improve the overall structural strength of the grip, prevent the plug position from cracking and deforming after long-term use, and improve the durability of the product.

[0055] The outer edges of grip A 701 and grip B 702 are provided with snap-fit ​​structures for screwless assembly and fixation with the printer housing. In this embodiment, both grip A 701 and grip B 702 have multiple protruding snap-fit ​​pieces 7026 on their outer sides, and the printer housing has matching snap-fit ​​grooves, which are engaged and fixed by the protrusions. In other embodiments, the outer edge of the grip can be provided with snap-fit ​​grooves, and the printer housing 800 can be provided with matching protruding snap-fit ​​pieces, which can also achieve adaptive snap-fit ​​fixation, and the structural adaptability range is wider.

[0056] All the interlocking and positioning structures, snap-fit ​​structures, and reinforcing ribs 7025 of grip A 701 and grip B 702 are integrally injection molded with the main body, resulting in strong structural integrity and convenient production and assembly. After the grips A 701 and B 702 are assembled, they form a complete hollow grip cavity. The cavity adopts a gradient aperture structure, with the smallest aperture in the middle and gradually widening towards both ends of the grip, conforming to the ergonomic grip shape and improving handheld carrying comfort.

[0057] XY bidirectional drive mechanism such as Figure 6 , 7 As shown, the entire assembly is mounted on the rack mounting plate 110, including an X-axis drive assembly 100, a Y-axis drive assembly 200, and a correction and compensation assembly. The rack mounting plate serves as the core load-bearing mounting base for the entire machine, and two parallel X-axis guide rods 105 are fixedly mounted on the back of the rack mounting plate, forming the lateral guide foundation for the entire machine.

[0058] like Figure 6 As shown, the first motor 101 is fixedly mounted on the frame mounting plate. The output shaft of the first motor 101 is fixedly sleeved with a gear 102. A rack 103 is fixedly connected to the second mounting plate 201 of the Y-axis drive assembly 200, and the gear 102 and rack 103 mesh with each other. Two bushing-type first linear bearings 104 are mounted on the top of the second mounting plate of the Y-axis drive assembly. The first linear bearings 104 are respectively sleeved on two X-axis guide rods 105, so that the entire Y-axis drive assembly can slide smoothly laterally along the X-axis guide rods. When the first motor rotates in both forward and reverse directions, it drives the second mounting plate 201, the Y-axis guide rods 205, the ink cartridge connecting block 400, and the ink cartridge as a whole to move back and forth along the X-axis guide rods through the meshing transmission of the gear 102 and rack 103, thus completing the lateral movement of the print.

[0059] like Figure 7As shown, the second mounting plate of the Y-axis drive assembly 200 is an independent modular load-bearing structure. The second motor 202 is fixedly mounted on the front of the second mounting plate, and two parallel Y-axis guide rods 205 are fixed longitudinally on the back of the second mounting plate. The output shaft of the second motor is equipped with a drive pulley (not shown in the figure, as it is obscured), and the end of the Y-axis guide rod 203 is equipped with a driven pulley 203. A transmission belt 204 is sleeved between the drive pulley and the driven pulley, and the transmission belt is fixedly connected to the ink cartridge connecting frame. When the second motor 202 operates, it drives the ink cartridge connecting block to move back and forth longitudinally along the Y-axis guide rods through the pulley and the transmission belt, completing the vertical positioning of the print.

[0060] A constant force spring 300 is mounted on the end of the frame mounting plate away from the first motor 101. One end of the constant force spring is fixedly connected to the second mounting plate; the other end is wound on a horizontal reel on the frame mounting plate. After the equipment is assembled, the constant force spring is always kept in a slightly stretched tension state, applying a constant preload traction force to the second mounting plate. When there is a machining or assembly gap in the gear and rack meshing, the preload force of the constant force spring can offset the transmission misalignment in real time, correct the fit deviation between the linear bearing and the X-direction guide rod, and ensure that the lateral movement of the Y-direction drive assembly is smooth and without jamming or deviation throughout the entire process.

[0061] Ink cartridge connection block structure as follows Figure 8 As shown, this serves as the adapter base for the ink replacement drive module. It includes a connecting block body 400, which is a one-piece molded structure with high structural strength and stability. The connecting block body 400 integrates a first connecting component and a second connecting component. The second connecting component serves as a universal docking structure, uniformly adapting to the Y-axis guide rod and synchronous belt drive structure of portable printers, regardless of ink cartridge specifications. The first connecting component serves as an adaptive docking structure, used for detachable connection to ink cartridge holders 500 corresponding to different ink cartridge specifications, achieving universal connection and differentiated adaptation.

[0062] like Figure 9 , 10 As shown, the first connecting component consists of two symmetrically arranged threaded holes 401 on the bottom surface of the connecting block body 400. These two threaded holes 401 are standardized, universal mounting positions, adaptable to the mounting standards of ink cartridge brackets for different ink cartridge sizes. When replacing ink cartridges of different sizes and models, operators only need to disassemble the bracket corresponding to the original ink cartridge, replace it with the dedicated bracket for the ink cartridge to be adapted, and lock it in place using the threaded holes 401. Assembly is completed without disassembling or replacing the connecting block body 400, nor adjusting the printer's Y-axis drive, guide, or other core transmission structures. Specification switching is simple and efficient, significantly improving equipment versatility.

[0063] The second connecting component is located on the top of the connecting block body 400, including a through hole 402 and a sliding sleeve 403 embedded inside the through hole 402. The sliding sleeve 403 is made of a wear-resistant and low-friction material, which can effectively reduce sliding wear. The connecting block body 404 is slidably mounted on the guide rod 205 of the Y-axis drive component through the through hole and the sliding sleeve, and can make stable longitudinal reciprocating movement along the guide rod 205 to ensure smooth and jam-free Y-axis movement of the ink cartridge.

[0064] In this embodiment, there are two through holes 402.

[0065] The connecting block body 400 has a slot on its side as a limiting component 405. The transmission component of the Y-axis drive assembly uses a synchronous belt 204, and the middle connecting section of the synchronous belt 204 is snapped and fixed inside the slot. The synchronous belt 204 has evenly distributed teeth on its side, and the inner wall of the slot has multiple grooves that match the teeth. After the synchronous belt is snapped into the slot, the teeth and grooves mesh and limit each other, completely preventing relative sliding or offset between the synchronous belt and the connecting block body 400 during transmission, ensuring complete synchronization of power transmission, and improving the positioning accuracy of the ink cartridge's longitudinal movement.

[0066] Multiple limiting posts 407 are fixedly installed on the bottom surface of the connecting block body 400 (the working surface on the same side as the threaded hole), and the end faces of all limiting posts 407 are located on the same horizontal plane. When the portable printer is placed, assembled, or working horizontally, the limiting posts 407 can play a role in supporting and leveling, limiting and positioning, preventing the connecting block body 400, ink cartridge bracket, and ink cartridge from tilting or shifting, ensuring the assembly accuracy of the whole machine and the horizontality of the printing operation, and effectively preventing the printed image from being skewed or misaligned.

[0067] Meanwhile, a through-hole weight reduction hole 408 (or a closed weight reduction cavity structure) is provided in the middle of the connecting block body 400. Through the hollow structure design, the weight of the connecting block is reduced to the greatest extent while maintaining the overall structural strength of the connecting block and without affecting the assembly and use performance. This meets the lightweight design requirements of portable printers and improves the portability of the device.

[0068] In actual assembly and use, the connecting block body 400 is permanently fitted and assembled with the printer's Y-axis drive structure via the second connecting component, serving as a universal transmission connection base. When selecting different specifications of ink cartridges according to actual printing needs, only the corresponding model of ink cartridge bracket needs to be matched and locked in place by the first connecting component. During operation, the Y-axis drive component drives the connecting block body 1 to slide back and forth along the guide rod via the synchronous belt, thereby driving the corresponding specification of ink cartridge bracket and ink cartridge to complete the Y-axis printing movement. The engagement structure of the slot and the synchronous belt ensures that the transmission is free from slippage and offset, and the limiting post ensures the flatness of the assembly. This invention solves the pain points of traditional printer ink cartridge connection structures, such as exclusive adaptation, poor universality, and high replacement costs. The overall structure has high integration, stable operation, and wide adaptability, perfectly adapting to small portable handheld printers that use multiple specifications of ink cartridges.

[0069] Ink cartridge components such as Figure 11 , 12 As shown in Figures 13 and 14, the device consists of an ink cartridge holder and an ink cartridge. The ink cartridge holder is fastened to the threaded hole on the bottom of the ink cartridge connecting block by a fastening screw, which enables detachable assembly. The corresponding ink cartridge holder can be replaced according to the ink cartridge specifications.

[0070] The ink cartridge holder includes a holder body 500, which adopts an integrated frame structure, resulting in a compact design and strong overall stability. The holder body 500 is assembled and connected to the device's Y-axis drive mechanism via a detachable connecting block 400. The connecting block 400 acts as an adapter, enabling the holder body 500 to move in tandem with the drive mechanism, meeting the device's reciprocating printing requirements. It is also easy to assemble and disassemble and highly adaptable. The frame structure features an open side, forming a closed ink cartridge receiving cavity. The open side serves as a dedicated loading and unloading channel for ink cartridges, facilitating quick installation and removal.

[0071] A limiting plate 502 is installed at the position corresponding to the top plate 501 of the bracket on the upper part of the cavity. A uniform assembly gap is reserved between the limiting plate 502 and the top plate 501, and a spring 503 is embedded in the gap. This structure abandons the traditional limiting method of hinged on both sides and torsion spring rotation, and adopts a single-sided fixed cantilever elastic structure: one end of the limiting plate 502 is rigidly fixed to the inner wall of the frame side plate, and the other end is a free movable end. The whole structure can only achieve a small vertical elastic deflection, without rotation or rotational offset. The spring 503 is in a relaxed state under normal conditions, keeping the free end of the limiting plate 502 in a horizontal downward limiting posture; when the limiting plate 502 is compressed and deflected upward, the spring 503 is compressed. After the pressure is removed, the spring 503 rebounds vertically and drives the limiting plate 502 to return to a horizontal reset.

[0072] A first limiting block 5021 is integrally formed protruding from the side of the limiting plate 502 facing the ink cartridge 600. The first limiting block 5021 has an overall V-shaped structure, on which a first inclined working surface 5022 and a second inclined working surface 5023 are smoothly connected. The first inclined working surface 5022 is close to the open side of the cavity and is mainly used for guiding and accommodating the ink cartridge 600 during installation. The second inclined working surface 5023 is close to the back plate side of the cavity and is mainly used for sliding and guiding the ink cartridge 600 during disassembly. A limiting platform 5024 is provided at the upper end of the second inclined working surface 5023 for the final positioning and bearing of the limiting protrusion, ensuring the stability of the ink cartridge 600 after assembly.

[0073] The inner lower ends of the side panels on both sides of the frame structure are symmetrically formed with guide platforms 505. The working surface of the guide platform 505 is the third inclined surface 5051. The third inclined surface 505 adopts an inclined structure from the outside to the inside and from the bottom to the top, and the upper end of the third inclined surface 5051 is integrally connected to the horizontal surface. The horizontal surface provides a precise limiting fulcrum for the pre-installation of the ink cartridge 600, effectively limiting the sliding stroke of the lower end of the ink cartridge 600, avoiding excessive offset during pre-installation, and providing a positioning reference for subsequent precise locking assembly.

[0074] The ink cartridge 600 is fitted with guide blocks symmetrically arranged on both sides of the lower outer wall, and a limiting protrusion is arranged in the center of the top. The ink cartridge 600 is equipped with a disassembly and assembly buckle 601 on the outside. The outer edges of the two side plates of the bracket body 500 are respectively provided with buckle mating positions 506. The ink cartridge 600 is initially locked by the disassembly and assembly buckle. It can be quickly unlocked by pressing the disassembly and assembly buckle. The structure is simple and reliable.

[0075] The detailed installation process of the ink cartridge of the present invention is as follows: The operator aligns the lower end of the ink cartridge 600 with the opening of the bracket cavity and pushes the lower end of the ink cartridge 600 inward. The guide blocks on both sides of the lower end of the ink cartridge 600 slide inward and upward along the third inclined surface 5051 of the guide platform 505 until the guide blocks abut against the horizontal surface at the upper end of the third inclined surface 5051. At this time, the lower end of the ink cartridge 600 is positioned, but the upper end is not fully inserted into the cavity, and the ink cartridge 600 is in a tilted pre-installed state. Then, the operator presses the upper part of the ink cartridge 600 into the cavity. The limiting protrusion on the top of the ink cartridge 600 slides against the first inclined working surface 5022 and continues to press against the free end of the limiting plate 502, causing the limiting plate 502 to elastically deflect upward and simultaneously compress the internal spring 503. Press the ink cartridge 600 continuously so that the limiting protrusion can smoothly pass the lowest point of the first limiting block 5021, and then slide upward along the second inclined working surface 5023, and finally fall smoothly onto the limiting platform 5024. At this time, the ink cartridge 600 changes from an inclined state to a vertical state, completing the precise assembly.

[0076] After the ink cartridge 600 is assembled, the pressing force is released, and the spring 503 extends and returns to its original position under its own elastic restoring force, driving the limiting plate 502 to deflect downwards, so that the bottom of the first limiting block 5021 is tightly pressed against the top of the ink cartridge 600. At this time, the spring 503 only recovers part of its length, always maintaining a slightly compressed state, continuously applying downward pre-tightening pressure to the ink cartridge 600. Together with the snap-fit ​​limiting of the side disassembly and assembly buckle 505, a double locking structure is formed, effectively preventing the ink cartridge 600 from shaking, shifting, or falling off due to equipment vibration. After assembly, the ink nozzle of the ink cartridge 600 maintains a standard vertical downward working posture, ensuring printing accuracy.

[0077] The detailed disassembly process of the ink cartridge of the present invention is as follows: When the ink cartridge 600 needs to be replaced, the operator presses the disassembly and assembly buckle 505 on the outside of the ink cartridge 600 to disengage the buckle from the outer edge of the bracket side plate, thus releasing the initial locking limit. Then, the operator holds the upper part of the ink cartridge 600 and pulls it outward. The limiting protrusion at the top of the ink cartridge 600 slides outward along the second inclined working surface 5023. During the sliding process, it continuously pushes up the free end of the limiting plate 502 and compresses the spring 503 to achieve elastic displacement. When the limiting protrusion passes the lowest point of the first limiting block 5021, it is completely released from the limiting constraint. Finally, the lower end of the ink cartridge 600 is pulled out along the guide table 504, thus completing the overall disassembly of the ink cartridge 600. The entire operation is simple, without hard wear, and the disassembly and assembly are smooth.

[0078] This embodiment adopts a single-sided cantilever direct pressure elastic limiting structure to replace the traditional torsion spring rotating hinge structure, solving the pain points of the traditional structure such as tilting of the limiting plate, insufficient pressure, jamming, and inability to remove the ink cartridge; combined with a multi-level inclined plane guide positioning and spring continuous pre-pressure locking structure, it achieves precise alignment of the ink cartridge 600, one-click locking, non-destructive disassembly and assembly, good assembly consistency, extremely strong limiting stability, simple and durable structure, extremely low failure rate, and highly adaptable to high-frequency use and frequent ink replacement scenarios of various portable inkjet printers.

[0079] A PCB contact board is attached to the back plate of the ink cartridge holder. The PCB contact board is routed to the inside of the housing via a flexible ribbon cable and finally electrically connected to the control module. The metal contacts on the PCB contact board are tightly connected to the conductive contacts at the rear of the ink cartridge to realize data communication between the ink cartridge and the control module.

[0080] Display assembly structure as follows Figure 15 As shown, a dual positioning structure combining magnetic adsorption and mechanical engagement is employed, as detailed below:

[0081] One end of the display screen 900 is hinged to the portable printer housing 800 via a hinge shaft 93, and can rotate around the hinge shaft to achieve opening and closing actions; when open, the display screen can be rotated to a position that is convenient for the operator to observe; when closed, the display screen is tightly fitted to the limiting surface of the portable printer body.

[0082] In this embodiment, a first magnet 921 (first positioning element) and a protrusion 922 (second positioning element) are fixedly installed on the side of the display screen near the limiting surface, such as... Figure 15 As shown, a second magnet (not shown in the figure) and a limiting slot (second limiting component) are fixedly installed at corresponding positions on the limiting surface of the portable printer body. The installation positions of the first magnet and the second magnet are adapted to each other, and the ends of the magnets are opposite magnetic poles. The size and shape of the protrusion and the limiting slot are adapted to each other. When the cover is closed, the protrusion is embedded in the limiting slot, and the first magnet and the second magnet attract each other to achieve dual positioning.

[0083] In this embodiment, as Figure 16 , 17 As shown, the support plate 912 on the portable printer body 1, on which the hinge shaft 93 is mounted, is provided with a second protrusion 9121, the outer surface of which is arc-shaped; the connecting component 922 on which the display screen 900 is connected to the hinge shaft 93 is provided with a second limiting slot 9221. When the bottom printing working surface of the portable printer is horizontal, rotating the display screen will cause the second protrusion to be embedded in the corresponding second limiting slot, thereby fixing the display screen at the corresponding angle, making it easy for the operator to observe and preventing the display screen from rotating accidentally under the action of gravity.

[0084] There is a gap between the support plate and the connecting component. The height of the second protrusion is slightly larger than this gap. Therefore, when the display screen rotates relative to the portable printer body, the second protrusion rubs against the non-second limiting slot part of the side of the support plate. However, the second protrusion is conical and its end has a small contact area with the support plate. Therefore, when the operator rotates the display screen, the second protrusion will not hinder its rotation.

[0085] In other embodiments, multiple second limiting slots can be provided, each corresponding to a different tilt angle (5°, 10°, 15°, 120°, 25°, 30°, 135°, 240°, 45°, 50°, 60°, 65°, 70°, 75°); alternatively, a structure can be adopted in which the main body has multiple second limiting slots and the connecting component has a second protrusion to achieve the same angle positioning effect.

[0086] The camera is fixed on the rack mounting plate 110, with the lens pointing vertically downwards towards the printhead on the base plate. The camera's signal cable is connected to the control module. During equipment operation, the camera captures the inkjet image at the printhead in real time. The image signal is transmitted to the control module for processing, and then a real-time preview is displayed on the screen. Operators can adjust the printing position and correct printing deviations based on the preview.

[0087] When using the machine, the operator holds the handle assembly and presses the power switch on the side of the casing to start the device. Print data is imported via the expansion interface or communicated via the wireless communication component in the control module. The control module drives the first and second motors according to a preset program. The first motor, through a rack and pinion mechanism, moves the Y-axis drive assembly laterally, while the second motor, through a synchronous belt, moves the ink cartridge connector, ink cartridge holder, and ink cartridge longitudinally. The ink cartridge reciprocates along with the XY bidirectional drive mechanism, and ink is sprayed from the bottom of the cartridge through the print nozzle onto the substrate, completing the inkjet printing operation. When a different ink cartridge needs to be replaced, simply unscrew the screws and replace the matching ink cartridge holder; the XY bidirectional drive mechanism and ink cartridge connector do not require modification.

[0088] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A grip structure for a portable handheld printer, characterized in that: It includes a housing, grip assembly, XY bidirectional drive mechanism, ink cartridge assembly, control module, battery, display screen, and camera; The grip assembly is assembled with the housing to form a sealed receiving cavity, and the battery and control board are arranged inside the receiving cavity to achieve a compact body layout. The XY bidirectional drive mechanism and ink cartridge assembly are both housed within the housing; the XY bidirectional drive mechanism is mounted on the frame mounting plate and is used to drive the ink cartridge assembly to reciprocate along the plane in the X and Y directions for printing. The display screen is hinged to the housing in a flip-up manner; The camera, display screen, XY bidirectional drive mechanism, and control board are electrically connected. The bottom plate of the housing has a printing port for dispensing ink from a matching ink cartridge; The camera is mounted on the rack mounting plate with the lens facing the print port. It captures the inkjet image and transmits it to the display screen via the control module for real-time observation and correction of the printing position. The side wall of the housing is equipped with a switch that is electrically connected to the control board.

2. The portable handheld inkjet printer according to claim 1, characterized in that: The grip assembly includes grip A and grip B. A plug-in positioning structure is provided between grip A and grip B. After the two are spliced ​​together by the plug-in positioning structure, a gradually changing hollow grip cavity is formed inside, which is narrow in the middle and gradually widens at both ends. Furthermore, grip A and grip B are provided with a snap-fit ​​structure on their outer edges, which is used to snap them into the housing.

3. The portable handheld inkjet printer according to claim 1, characterized in that: The XY-direction drive mechanism includes an X-direction drive component and a Y-direction drive component; The X-axis drive assembly includes a first motor, an X-axis guide rod, a gear, and a rack. The first motor is fixedly mounted on the frame mounting plate, the X-axis guide rod is fixed to the back of the frame mounting plate, the gear is fixedly sleeved on the output shaft of the first motor, and the rack is fixedly connected to the Y-axis drive assembly. The gear and rack mesh and drive each other to drive the entire Y-axis drive assembly to reciprocate along the X-axis guide rod. The Y-axis drive assembly includes a second mounting plate, a second motor, a belt drive assembly, a Y-axis guide rod, and an ink cartridge connecting frame. The rack is fixedly connected to the second mounting plate, and the second motor is fixedly mounted on the second mounting plate. The belt drive assembly includes a driving pulley, a driven pulley, and a synchronous belt. The driving pulley is mounted on the output shaft of the second motor, the driven pulley is mounted on the end of the Y-axis guide rod, and the synchronous belt is sleeved on the driving pulley and the driven pulley, and is fixedly connected to the ink cartridge connecting frame. The second motor drives the ink cartridge connecting frame to reciprocate longitudinally along the Y-axis guide rod through the belt drive assembly.

4. The portable handheld inkjet printer according to claim 3, characterized in that: It also includes a correction and compensation component, including a constant force spring, which is located at the end of the frame mounting plate away from the first motor; One end of the constant force spring is fixedly connected to the second mounting plate; the other end is wound on a horizontal roller on the frame mounting plate; the constant force spring is kept in a continuously tensioned preload state.

5. The portable handheld inkjet printer according to claim 3, characterized in that: The ink cartridge connecting block is the adapter base of the ink replacement transmission module, and the ink cartridge connecting block integrates a first connecting component and a second connecting component; The second connecting component has a through hole for an embedded sliding sleeve and a groove with a groove on the inner side. The groove meshes with the teeth of the synchronous belt to achieve universal transmission docking. The connecting block body is slidably sleeved on the guide rod of the Y-axis drive component through the through hole and the sliding sleeve. The first connecting component is a standardized threaded hole located on the bottom surface of the connecting block; The bottom surface of the connecting block is provided with a limiting post with coplanar end faces, and the body of the connecting block is provided with a weight reduction hole or a weight reduction cavity.

6. The portable handheld inkjet printer according to claim 5, characterized in that: The ink cartridge assembly includes an ink cartridge bracket and an ink cartridge. The ink cartridge bracket is detachably locked onto the ink cartridge connecting block via a first connecting component to form a replaceable assembly structure. The ink cartridge holder is a frame cavity structure with one side open. A single-sided cantilevered limiting plate is installed in the upper space of the cavity. A direct compression spring is installed in the gap between the limiting plate and the top plate of the ink cartridge holder. The bottom surface of the limiting plate protrudes to the side facing the ink cartridge to form a first limiting block. A third inclined guide platform with a horizontal limiting platform is symmetrically arranged at the lower end of the side plates on both sides of the ink cartridge holder. The outer wall of the ink cartridge is equipped with a disassembly buckle, and the outer edge of the side plate of the ink cartridge bracket is equipped with a buckle mating position. The buckles and the buckle mating positions engage to form a side locking structure. During ink cartridge assembly, its lower end is pre-positioned along the third inclined guide platform. The top limiting protrusion of the ink cartridge squeezes the limiting plate and compresses the spring, then locks into the limiting platform. The ink cartridge forms a double locking structure by relying on the spring pre-tightening force and the side buckle.

7. The portable handheld inkjet printer according to claim 6, characterized in that: The first limiting block is provided with a first inclined working surface and a second inclined working surface, and the end face of the first limiting block is V-shaped; the first inclined working surface is located on the side of the cavity opening, and the second inclined working surface is located on the side of the cavity back plate. The first inclined working surface and the second inclined working surface are smoothly connected and formed. The first inclined working surface is used for guiding and making way when the ink cartridge is installed, and the second inclined working surface is used for sliding and guiding when the ink cartridge is removed. The two work together to form the snap-fit ​​positioning area of ​​the limiting protrusion on the top of the ink cartridge. The upper end of the second inclined working surface is provided with a limiting platform to support the limiting protrusion and achieve precise positioning after the ink cartridge is assembled.

8. The portable handheld inkjet printer according to claim 6, characterized in that: The ink cartridge holder back plate is fixed with a PCB contact board, which is electrically connected to the control board via a flexible ribbon cable. The metal contacts of the PCB contact board are connected to the contacts on the surface of the ink cartridge to achieve data interaction between the ink cartridge and the control board.

9. The portable handheld inkjet printer according to claim 1, characterized in that: One end of the display screen is hinged to the housing, and the housing is provided with a limiting surface; Magnets are provided on the back of the display screen and on the limiting surface, and the two are magnetically attracted to achieve the closing, storage and locking of the display screen. The hinge of the display screen is provided with a second arc-shaped protrusion and multiple sets of second limiting slots. The second protrusion can be inserted into different slots to fix the display screen at different angles.

10. The portable handheld inkjet printer according to claim 1, characterized in that: The side wall of the housing is provided with an expansion interface and a charging port that are electrically connected to the control board.

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