Wire breakage prevention device and method in single-pass mode

Abstract

The invention relates to a wire breakage prevention device and method in a single-pass mode. The device comprises a printing assembly, and the printing assembly comprises an assembly bottom plate; the assembly bottom plate is arranged above the printing platform; the first spray head group is arranged on the assembly bottom plate and is used for carrying out ink-jet printing on the printing medium on the printing platform; the nozzle group guide rail is arranged on the assembly bottom plate, one end of the nozzle group guide rail is located on a printing station on the printing platform, and the other end of the nozzle group guide rail is far away from the printing platform and extends to a cleaning and moisturizing station; the nozzle group cleaning and moisturizing mechanism is arranged at one end, away from the printing platform, of the nozzle group guide rail; the second spray head group is arranged in the spray head group cleaning and moisturizing mechanism and is in a standby state; and the first nozzle group and the second nozzle group move along the nozzle group guide rail to realize position exchange and then are fixed at a printing station through a push rod. According to the invention, line breakage can be effectively prevented on the premise of meeting high-speed printing.

Description

Technical Field

[0001] The present application relates to the field of printers, and in particular to a device and method for preventing line disconnection in a single-pass mode. Background Art

[0002] Inkjet printing, in single-pass mode, offers greater cost-effectiveness and speed, and is rapidly replacing traditional printing. However, compared to traditional printing speeds, inkjet printing speeds still need to be improved due to constraints such as the firing frequency of the printheads. With a target resolution of 600dpi or 1200dpi, inkjet printhead combinations from various brands typically do not exceed 100 meters per minute, with speeds of 30-50 and 50-70 meters being more common. Here, a printhead combination capable of full CMYK four-color printing at a target resolution of 600dpi or 1200dpi is referred to as a "group." Traditional printing, by contrast, has already achieved speeds of 400-500 meters per minute. To bridge the gap between digital and traditional printing, multiple groups of printheads are required to achieve higher speeds, and such applications are already emerging.

[0003] In single-pass mode, due to the limitations of the printing mechanical movement, there is a defect that is not easy to ignore compared with the traditional scanning printing mode, that is, print line breakage. The nozzle group does not move during the printing production process and has no "idle" time, which makes it difficult to automatically repair. For printing materials with good ink absorption and excellent wettability, this contradiction is not significant, but it is very significant for many printing media with high printing requirements and slightly poor ink absorption. Many auxiliary solutions have also appeared on the market.

[0004] For example, based on the traditional four-color (and also with more channels, such as six, seven, and eight) printheads, a variety of internal circulation piezoelectric printheads have emerged. These incorporate an internal ink circulation loop, ensuring constant ink circulation and reducing ink drying and resulting ink breakage. However, their complex internal structure occupies the limited space within the printhead, resulting in these printheads on the market typically supporting only single or, at most, two colors. A single printhead cannot meet the requirements of CMYK four-color printing, requiring a combination of multiple printheads. This combination of multiple printheads cannot completely resolve the problem of ink breakage. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to overcome the deficiencies of the prior art and to provide a device and method for preventing line breakage in a single-pass mode, which can effectively prevent line breakage while meeting high-speed printing requirements.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides an anti-disconnection device in a single-pass mode, comprising:

[0008] Printing assembly, the printing assembly includes an assembly base;

[0009] An assembly base plate is arranged above the printing platform;

[0010] A first nozzle group is provided on the assembly base plate and is used for performing inkjet printing on the printing medium on the printing platform;

[0011] A nozzle group guide rail is provided on the assembly bottom plate, one end of the nozzle group guide rail is located at the printing station on the printing platform, and the other end is away from the printing platform and extends to the cleaning and moisturizing station;

[0012] The nozzle group cleaning and moisturizing mechanism is arranged at the end of the nozzle group guide rail away from the printing platform;

[0013] The second nozzle group is arranged in the nozzle group cleaning and moisturizing mechanism and is in a standby state;

[0014] The first nozzle group and the second nozzle group move along the nozzle group guide rail to achieve position exchange and are then fixed at the printing station by a push rod.

[0015] The first nozzle group and the second nozzle group both include nozzles and nozzle substrates for supporting the nozzle groups.

[0016] Positioning adjustment mechanisms for aligning and positioning the nozzle substrate are provided on both sides of the assembly bottom plate.

[0017] An elastic connector for fixing the nozzle substrate is provided on the nozzle group guide rail at a position above the printing platform.

[0018] The first nozzle groups are set to one group, two groups or more than two groups, and the number of the second nozzle groups is set according to the number of the first nozzle groups.

[0019] The positioning and adjustment mechanism includes a first positioning block, which is arranged on the side of the assembly base plate to prevent the left and right sides of the nozzle substrate from shifting. The positioning and adjustment mechanism also includes a support seat for supporting the bottom surface of the nozzle substrate. A positioning groove is provided in the middle of the support seat, and the positioning pins at the bottom of the nozzle substrate correspond to the positioning groove. An adjusting screw base is also provided on the side of the support seat, and the adjusting screw is provided on the adjusting screw base to adjust the support seat in the movement direction of the printing medium.

[0020] The elastic connector includes a connecting pressure plate fixedly connected to the nozzle group guide rail, a pressing spring is provided below the end of the connecting pressure plate, and a clamping plate is provided at the lower end of the pressing spring. The elastic connector is provided at the four corners of the nozzle substrate, and the clamping plate is pressed against the surface of the nozzle substrate to fix the nozzle substrate.

[0021] There are two push rods, which are respectively located at the two ends of the nozzle base plate. The top ends of the push rods correspond to the positioning holes opened at the two ends of the nozzle base plate to press down and position the nozzle base plate.

[0022] The push rod is an electric push rod, and the top end of the push rod is an elastic push rod head.

[0023] In a second aspect, an embodiment of the present application provides a method for preventing disconnection in single-pass mode, using the above-described apparatus, including the following specific steps:

[0024] Install the first nozzle group, the second nozzle group and the nozzle group guide rail according to the printing medium;

[0025] Before production and use, the height of the first nozzle group, the second nozzle group and the medium is adjusted using the positioning adjustment mechanism corresponding to the nozzle base plate of each nozzle group.

[0026] Set the printing time of the first nozzle group, and move the second nozzle group along the nozzle group guide rail to the printing station when the printing time of the first nozzle group is about to expire;

[0027] The second nozzle group is pressed down by the push rod, and the positioning pins on the nozzle base plate and the positioning grooves at the lower end complete the positioning;

[0028] The software controls the time difference between the two groups of nozzles to print, compensating for the physical distance difference between the first and second nozzle groups. This ensures a continuous image on the printed medium and avoids splicing artifacts caused by nozzle group switching.

[0029] The first nozzle group moves out of the printing station and enters the nozzle group cleaning and moisturizing mechanism of the cleaning and moisturizing station to start cleaning and moisturizing. After completion, it is in the moisturizing standby state;

[0030] At this time, the first nozzle group is in the cleaning and moisturizing station, while the second nozzle group is in the printing station, completely taking over the printing task of the first nozzle group, and circulating back and forth to achieve the purpose of preventing line breakage.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The structure of the present application can be used for four-color and multi-color printheads, as well as single-color and dual-color printheads (with an internal ink circulation structure). The structure of the present application is simple, and can effectively prevent line breakage while meeting the requirements of CMYK four-color or multi-color printing (including the setting for adding special printing colors), and can also completely solve the line problem of single-color and dual-color printheads. Traditional inkjet printers use scanning printing, and because the printheads have auxiliary means such as intermittent inkjet pauses and printing color bars to prevent the ink from drying out, there will be no line breakage problems during long printing periods. There is even a setting for pausing the screen printing, cleaning it, and then resuming printing, so that the screen printing effect will not have screen defects due to the pause action. This application similarly borrows from this functionality, achieving its purpose by replacing two sets of printheads. For example, if production requires a higher single-pass printing speed, two sets of printheads may be required to meet the required printing speed based on the printing parameter characteristics of a single set of printheads. Alternatively, if two sets of printheads are required to achieve the desired printing speed, a second set can be added to intermittently replace one of the two working printheads in the print station. These two sets of printheads can rotate to achieve intermittent printing, while the image is printed on the print medium continuously and seamlessly (software-assisted), effectively creating a three-set printhead system. This printing effect not only improves the image breakage that occurs with a single set of printheads over a certain length, but also prevents various interference factors such as temperature rise caused by long-term uninterrupted operation of the printheads, which can lead to changes in ink dot size and color depth. This ensures image clarity and continuity, ensuring the quality of the printed image. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;

[0035] Figure 2 This is a schematic diagram of the connection between the nozzle group and the nozzle group guide rail of this application;

[0036] Figure 3 This is a schematic diagram of the positioning adjustment mechanism of this application;

[0037] Figure 4 A schematic diagram of the elastic connector of this application;

[0038] Figure 5 This is a schematic diagram of the overall structure of Example 2 of the present application;

[0039] Figure 6 This is a schematic diagram of the overall structure of Example 3 of this application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] The terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0042] The terms "first," "second," etc. are only used to distinguish one entity or operation from another entity or operation, and are not to be understood as indicating or implying relative importance, nor are they to be understood as requiring or implying any actual relationship or order between these entities or operations.

[0043] Example 1, a printer formed by a group of nozzle groups, see Figures 1 to 4 , a single-pass mode anti-disconnection device, comprising,

[0044] The printing assembly 1 is mounted on the printer guide rail 4;

[0045] The assembly base plate 3 is arranged above the printing platform 2;

[0046] The first nozzle group 5 is provided on the assembly base plate 3 and is used for performing inkjet printing on the printing medium on the printing platform 2;

[0047] A nozzle group guide rail 6 is provided on the assembly base plate 3, with one end of the nozzle group guide rail 6 being located at the printing station on the printing platform 2, and the other end being away from the printing platform 2 and extending to the cleaning and moisturizing station;

[0048] The nozzle group cleaning and moisturizing mechanism 8 is arranged at the end of the nozzle group guide rail 6 away from the printing platform 2;

[0049] The second nozzle group 7 is arranged in the nozzle group cleaning and moisturizing mechanism 8 and is in a standby state;

[0050] After the first nozzle group 5 and the second nozzle group 7 move along the nozzle group guide rail to achieve position exchange, they are fixed to the printing station by the push rod 11. The specific process is as follows: first, the nozzles of the first nozzle group 5 and the second nozzle group 7 are both in the printing station. The two push rods of each nozzle group 5 are pressed down, causing the elastic connector support spring to compress, driving the nozzle base plate to descend. The three positioning pins installed on its bottom surface engage with the male and female structures of the corresponding three-point positioning structure to achieve X and Y axial positioning. The three-point positioning device configured on each nozzle base plate can also adjust the distance and parallelism between the nozzle base plate and the printing medium according to printing needs. After adjusting the distance between the nozzle base plate and the printing medium using a physical tool, such as a height gauge, start the printer, use the setting program of the printing software to print and detect the nozzle status, and adjust the three-point positioning structure of the nozzle base plate according to the nozzle detection line to correct the verticality of the nozzle. Alternatively, the Y-axis distance between the two groups of nozzles can be appropriately adjusted to a reasonable position when the verticality is qualified, in preparation for the intermittent exchange of the two groups of nozzles.

[0051] After adjusting the positioning, start the first group of nozzles to start printing, retract the second group of push rods, and rebound the elastic connector. The second group of nozzle base plates rises, and the three-point positioning male and female structures are separated to the point where they do not affect the x-axial movement of the nozzle base plate. The nozzle base plate moves along its two guide rails to the standby moisturizing position to moisturize and realize the moisturizing standby of the nozzles.

[0052] Based on the printing situation, at an interval, before a break is expected, the second set of printheads returns from the standby moisturizing station to its original printing station. The push rods push down, the elastic connector lowers, and the three positioning pins on the printhead baseplate align with the three-point positioning structure again. Then, using a software algorithm, the printheads on the first set of printhead baseplates are shut down and those on the second set of printhead baseplates are activated, seamlessly switching between the two printheads. After the first set of printheads stops printing, their two push rods retract, and the elastic connector rebounds, lifting the printhead baseplate until it clears the three-point positioning structure. Then, along its two dedicated guide rails, it moves to the standby cleaning station, where the printheads begin cleaning. After cleaning, the printheads are moisturized and ready for the next print cycle. The cycle repeats with subsequent printing, shutdown at intervals, shifting, cleaning, and moisturizing.

[0053] The first nozzle group 5 and the second nozzle group 7 both include nozzles and nozzle substrates for supporting the nozzle groups.

[0054] Positioning adjustment mechanisms 9 for aligning and positioning the nozzle substrate are provided on both sides of the assembly base plate 3 .

[0055] An elastic connector 10 for fixing the nozzle substrate is provided on the nozzle group guide rail 6 above the printing platform 2 .

[0056] The first nozzle groups 5 are arranged as one group, two groups or more than two groups, and the number of the second nozzle groups 7 is arranged in accordance with the number of the first nozzle groups 5 .

[0057] The positioning and adjustment mechanism 9 includes a first positioning block 90, which is arranged on the side of the assembly base plate 3 to prevent the left and right sides of the nozzle substrate from shifting. The positioning and adjustment mechanism 9 also includes a support seat 91 for supporting the bottom surface of the nozzle substrate. A positioning groove 92 and a positioning recess are provided in the middle of the support seat 91. The positioning pins 93 at the bottom of the nozzle substrate correspond to the positioning groove 92 and the positioning recess. An adjusting screw base 94 is also provided on the side of the support seat 91. An adjusting screw 95 is provided on the adjusting screw base 94 to adjust the support seat 92 in the movement direction of the printing medium.

[0058] The positioning adjustment mechanism 9 adopts a three-point positioning structure to adjust the position of the nozzle base plate. The whole machine only needs to be adjusted before the first use. After adjustment, no further adjustment is required for subsequent use.

[0059] The elastic connector 10 includes a connecting pressure plate 101 fixedly connected to the nozzle group guide rail, a pressing spring 102 is provided below the end of the connecting pressure plate 101, and a clamping plate 103 is provided at the lower end of the pressing spring 102. The elastic connector 10 is provided at the four corners of the nozzle substrate, and the clamping plate 103 is pressed against the surface of the nozzle substrate to fix the nozzle substrate.

[0060] Two push rods 11 are provided. The two push rods 11 are respectively located at the two ends of the nozzle base plate. The top ends of the push rods correspond to the positioning holes 12 opened at the two ends of the nozzle base plate to press down and position the nozzle base plate.

[0061] The push rod 11 is an electric push rod, and the top end of the push rod is an elastic push rod head.

[0062] The present application provides a method for preventing disconnection in single-pass mode, using the above-described device, including the following specific steps:

[0063] Install the first nozzle group, the second nozzle group and the nozzle group guide rail according to the printing medium;

[0064] 1. Machine debugging and nozzle base plate positioning.

[0065] Before production use, the first step is to utilize the positioning adjustment mechanism on each printhead baseplate and a measuring tool to properly adjust the height of the two printhead groups relative to the media. Then, using the print software, observe and compare the printhead test lines printed on the print media to adjust the verticality of the printhead groups and the appropriate physical spacing between the printhead groups. During commissioning, the push rod is pressed downward to align the positioning pins on the printhead baseplate with the corresponding positioning grooves and recesses. Printing is controlled by each printhead group. The test images of the two printhead groups on the print media are compared, and the corresponding positioning adjustment mechanisms of the two printhead groups are adjusted until the test images meet the requirements. The machine then enters production printing mode.

[0066] 2. The machine works and prints in a cycle.

[0067] Set the printing time of the first nozzle group, and move the second nozzle group along the nozzle group guide rail to the printing station when the printing time of the first nozzle group is about to expire;

[0068] The second group of nozzles are pressed down by the push rod, and the positioning pins on the nozzle base plate match the positioning grooves or circular recesses at the lower ends to achieve positioning.

[0069] The software is used to control the time difference of printing between the two groups of nozzles to compensate for the physical distance difference between the first nozzle group and the second nozzle group; so that the picture on the printing medium is continuous and the splicing marks on the picture caused by the switching of nozzle groups are avoided.

[0070] After completion, the first nozzle group moves out of the printing station and goes to the nozzle group cleaning and moisturizing mechanism of the cleaning and moisturizing station to start cleaning and moisturizing. After completion, it is in the moisturizing standby state;

[0071] At this time, the first nozzle group is in the cleaning and moisturizing station, while the second nozzle group is in the printing station, completely taking over the printing task of the first nozzle group, and circulating back and forth to achieve the purpose of preventing line breakage.

[0072] Example 2, a printer formed by two groups of nozzle groups, such as Figure 5 As shown, there are two first nozzle groups 5 , and correspondingly, there are also two second nozzle groups 7 .

[0073] Example 3, a printer formed by two groups of nozzle groups, such as Figure 6 As shown, three first nozzle groups 5 are provided, and correspondingly, three second nozzle groups 7 are also provided.

[0074] In Examples 1-3, the first nozzle group 5 and the second nozzle group 7 each include 10 inkjet nozzles.

[0075] Specifically: When printing needs dictate only one single-pass printhead group, this solution proposes adding a second, "idle" backup group. Based on the expected interval between printhead disconnections, the two groups rotate through mechanical control. While one group is printing, the other group shifts to a cleaning, repair, and moisturizing station, where it completes cleaning and repair, and then remains in a moisturizing standby state. Specifically, the first printhead group is in the print station, while the second printhead group is in the cleaning and moisturizing station. The first printhead group is in the printing state, while the second printhead group is in the standby state. If the first printhead group is expected to disconnect, the second printhead group is moved to the print station. Software algorithms are used to compensate for the time difference in ink drop placement on the same position on the print medium caused by the physical distance difference between the first and second printhead groups, or by considering the number of overlapping holes between the first and second printhead groups (to compensate for color difference and feathering between the printheads). Once this compensation is completed, the first printhead group is moved out of the print station and to the cleaning and moisturizing station to begin cleaning and moisturizing. After cleaning and moisturizing, it is placed in the moisturizing standby state. At this point, the first printhead group is in the cleaning and moisturizing station, while the second printhead group is in the print station, completely taking over the printing task of the first printhead group. This cycle then repeats. Here, a higher splicing accuracy must be achieved within the first and second groups of nozzles. As shown in the embodiment of the present application, 10 nozzles are grouped together, and a positioning adjustment mechanism for manually debugging the two groups of nozzles is provided. This debugging can be performed during the printing test, based on the pattern prompts of the print nozzle status, and the physical position is corrected and fixed. On this basis, the physical positioning error of the two groups of nozzles needs to be no more than 0.01mm. At the same time, the first and second groups of nozzles can also overlap or intersect their inkjet points during the printing splicing connection, supplemented by a software feathering algorithm to reduce the impact of color difference and splicing errors printed by the two groups of nozzles on the graphics.

[0076] To ensure long-term positioning accuracy and overcome the effects of wear, each group of printheads in this application utilizes a three-point positioning mechanism in the Z-axis direction, perpendicular to the printing surface, at the printing station. This structure helps eliminate the cumulative errors caused by repeated displacement of the two groups of printheads and wear in the X and Y axes (direction of the printing plane), ensuring the accurate positioning of each group of printheads in the X and Y axes at the printing station. Furthermore, two of the three positioning adjustment mechanisms can be manually adjusted relative to each other, facilitating precise adjustment of the relative positions of the first and second groups with the assistance of the printing software. The specific movement process is as follows: the printhead base plate is connected to the guide rail slider using an elastic connector. It moves on the guide rail via the slider. The positioning pin has a clearance distance from the positioning slot in the Z-axis direction when moving along the guide rail, so that it can move back and forth along the X-axis. After it moves to the printing station, the left and right push rods push the printhead base plate downward along the Z-axis direction. The optimal method is elastic pushing, which forces the three positioning pins on the back of the printhead base plate into the positioning slot with force and without gaps. Because the printhead base plate and the guide rail slider are connected using an elastic connector, it allows for three-dimensional variation within a certain size range, thereby achieving precise positioning. When it is necessary to move to the cleaning and moisturizing station, the push rod is released, and the spring on the elastic connector fixed between the push rod and the slider rebounds, pulling up the printhead base plate and vacating the positioning pins, thus eliminating the interference obstacle of X-axis movement and achieving X-axis displacement.

[0077] When increasing print speed, the print head configuration needs to be increased to two or more groups. Similar to the previous single group of print heads, we also propose adding a spare "idle" group of print heads. If necessary, two groups can be increased to three, and if necessary, three groups can be increased to four. The print head groups are then rotated for "idle" maintenance. This approach, combined with software settings, achieves the most economical and reliable solution to prevent disconnections. That is, when in order to further increase the printing speed, it is necessary to ensure the current printing resolution of 600dpi or 1200dpi (it must be noted here that if a 600dip nozzle is used to achieve a 1200dpi printing effect, an additional group of nozzles is often added. The additional group here is actually two groups. The purpose of adding this group of nozzles is not to increase the printing speed, but to increase the printing accuracy. In this article, it is still considered one group). Here, the 2+1 combination mode is taken as an example: if the nozzles are divided into 1, 2, and 3 groups according to the direction of the printing medium, the optimal physical spacing between the three groups of nozzles is parallel and equidistant. Unequal spacing is also allowed, but they must be highly parallel. The nozzle spacing error between the first and last sections should be controlled within 0.01mm. To ensure the splicing printing effect of the nozzle groups between 600-1200dpi, the error of the X-axis (media movement direction) and Y-axis (perpendicular to the media movement) should be controlled within 0.01mm, and the height error of the mounting surface of the three groups of nozzles in the Z-axis direction should not exceed 5mm. Printhead group 1 is the standby group, while groups 2 and 3 are the working group. Based on the different printhead types and the impact of ink, within a predetermined timeframe (presumably due to ink shortage), group 1 will start up, group 2 will stop, and group 1 will take over. The printing software algorithm will compensate for the physical gap between the two groups. This ensures that the inkjet dots from group 1 overlap exactly where they should (with an error of no more than 0.01mm). Group 2 is physically moved to a nozzle cleaning and repair position perpendicular to the media's direction of motion. This position can be either left or right. Printhead repair is performed using the same method as the scanning pattern of an inkjet printer. After repair, the printheads are precisely returned to their original positions to serve as the standby group. This is similar to the process of increasing the number of printheads from one group to two. The optimal positioning error after this return is within 0.01mm. At this point, groups 1 and 3 are the working group, with group 2 serving as the standby group. As in the first step, after a suitable interval, group 2 starts spraying, while group 3 stops. Software controls the delay time of the second set of inkjet prints, ensuring that the two sets of ink dots overlap exactly (within 0.01mm) at the corresponding positions of the original three sets, replacing their work. The third set of printheads then moves to a position perpendicular to the direction of print media movement for nozzle cleaning and repair. After cleaning and repair, the printheads return to their working positions for standby use. The return to physical position is repeated with an accuracy of at least 0.01mm.Unlike the previous two-group control printing sequence, when cleaning and repairing group 1, at appropriate intervals, before group 1's last print is complete, group 2 switches to printing the portion of the media physically located where group 1 originally printed, and group 3 switches to printing the portion of the media physically located where group 2 originally printed. This allows a brief, software-controlled period for all three groups to print simultaneously, allowing group 1 to transition from the working group to the standby group. This completes the first cycle of maintenance and repair for the three printhead groups, and the cycle continues.

[0078] The three groups of printheads can also be connected end to end in the printed pattern, just like the two groups of printheads mentioned above. The algorithm can also allow the two groups of ink dots to partially overlap, creating conditions for the software feathering algorithm and compensating for color difference and physical splicing errors. In the algorithm of the ink dot printing order, each group of printheads corresponds to the physical ink dots on the medium. The four colors of CMYK are all completed by this group of printheads. Adding a printhead group only increases the spacing between the ink dots printed by the group of printheads in the Y-axis direction. The following printhead group inserts the vacant ink dots to make up for the missing ink dots on the screen, thereby increasing the printing speed. This arrangement can avoid the same ink dot position. When CMYK needs color synthesis, multiple groups of printheads will perform the color superposition separately, resulting in a change in the color sequence during the printhead group switching process, resulting in color difference in that section of the screen! This is because the color superposition order is important in the printing color matching process. For example, green is actually a combination of 50% blue and 50% yellow. However, if yellow or blue is printed first on the print medium, the resulting green will have a color difference. To avoid this, a fixed order for the overlay of different color dots is required. The aforementioned printhead group switching order is designed to facilitate software algorithm arrangement, avoiding changes in the order of each group, which would result in a change in the overlay order of the ink dots of an irreconcilable composite color! This switching of printhead groups would cause partial color difference on the media, affecting product quality. The overlapping and cross-arranged arrangement of the ink dots printed by the front and rear printhead groups creates the conditions for the feathering effect during the connection process between the two printhead groups, masking the color difference between the two groups and the physical errors of the splicing.

[0079] The above single-group and two-group solutions can be extended to N+1. N refers to the number of printhead groups actually required, which is based on the need to improve speed and quality. +1 is simply to avoid line breakage. It can also be increased to +2, +3, or even +N depending on the number of printhead groups.

[0080] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A single-pass mode anti-disconnection device, characterized in that: include, Printing assembly, the printing assembly includes an assembly base; An assembly base plate is arranged above the printing platform; A first nozzle group is provided on the assembly base plate and is used for performing inkjet printing on the printing medium on the printing platform; A nozzle group guide rail is provided on the assembly bottom plate, one end of the nozzle group guide rail is located at the printing station on the printing platform, and the other end is away from the printing platform and extends to the cleaning and moisturizing station; The nozzle group cleaning and moisturizing mechanism is arranged at the end of the nozzle group guide rail away from the printing platform; The second nozzle group is arranged in the nozzle group cleaning and moisturizing mechanism and is in a standby state; The first nozzle group and the second nozzle group move along the nozzle group guide rail to achieve position exchange and are then fixed at the printing station by a push rod.

2. The anti-disconnection device in single-pass mode according to claim 1, characterized in that: The first nozzle group and the second nozzle group both include nozzles and nozzle substrates for supporting the nozzle groups.

3. The anti-disconnection device in single-pass mode according to claim 2, characterized in that: Positioning adjustment mechanisms for aligning and positioning the nozzle substrate are provided on both sides of the assembly bottom plate.

4. The anti-disconnection device in single-pass mode according to claim 2, characterized in that: An elastic connector for fixing the nozzle substrate is provided on the nozzle group guide rail at a position above the printing platform.

5. The anti-disconnection device in single-pass mode according to claim 2, characterized in that: The first nozzle groups are set to one group, two groups or more than two groups, and the number of the second nozzle groups is set according to the number of the first nozzle groups.

6. The anti-disconnection device in single-pass mode according to claim 3, characterized in that: The positioning and adjustment mechanism includes a first positioning block, which is arranged on the side of the assembly base plate to prevent the left and right sides of the nozzle substrate from shifting. The positioning and adjustment mechanism also includes a support seat for supporting the bottom surface of the nozzle substrate. A positioning groove is provided in the middle of the support seat, and the positioning pins at the bottom of the nozzle substrate correspond to the positioning groove. An adjusting screw base is also provided on the side of the support seat, and the adjusting screw is provided on the adjusting screw base to adjust the support seat in the movement direction of the printing medium.

7. The anti-disconnection device in single-pass mode according to claim 4, characterized in that: The elastic connector includes a connecting pressure plate fixedly connected to the nozzle group guide rail, a pressing spring is provided below the end of the connecting pressure plate, and a clamping plate is provided at the lower end of the pressing spring. The elastic connector is provided at the four corners of the nozzle substrate, and the clamping plate is pressed against the surface of the nozzle substrate to fix the nozzle substrate.

8. The anti-disconnection device in single-pass mode according to claim 2, characterized in that: There are two push rods, which are respectively located at the two ends of the nozzle base plate. The top ends of the push rods correspond to the positioning holes opened at the two ends of the nozzle base plate to press down and position the nozzle base plate.

9. The anti-disconnection device in single-pass mode according to claim 8, characterized in that: The push rod is an electric push rod, and the top end of the push rod is an elastic push rod head.

10. A method for preventing disconnection in single-pass mode, using the device according to any one of claims 1 to 9, characterized in that: The specific steps include: Install the first nozzle group, the second nozzle group and the nozzle group guide rail according to the printing medium; Before production and use, the height of the first nozzle group, the second nozzle group and the medium is adjusted using the positioning adjustment mechanism corresponding to the nozzle base plate of each nozzle group. Set the printing time of the first nozzle group, and move the second nozzle group along the nozzle group guide rail to the printing station when the printing time of the first nozzle group is about to expire; The second nozzle group is pressed down by the push rod, and the positioning pins on the nozzle base plate and the positioning grooves at the lower end complete the positioning; The software controls the time difference between the two groups of nozzles to print, compensating for the physical distance difference between the first and second nozzle groups. This ensures a continuous image on the printed medium and avoids splicing artifacts caused by nozzle group switching. The first nozzle group moves out of the printing station and enters the nozzle group cleaning and moisturizing mechanism of the cleaning and moisturizing station to start cleaning and moisturizing. After completion, it is in the moisturizing standby state; At this time, the first nozzle group is in the cleaning and moisturizing station, while the second nozzle group is in the printing station, completely taking over the printing task of the first nozzle group, and circulating back and forth to achieve the purpose of preventing line breakage.

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