An inkjet method, an inkjet system and an inkjet device

Abstract

The application provides a spraying method, a spraying system and a spraying device. The spraying method is based on a spraying device loaded with at least two groups of nozzle cleaning structures and nozzles to perform spraying work. Any nozzle in each group of the spraying device is preset as a working nozzle, and another nozzle is preset as a standby nozzle. During the spraying process, the quality of the current spraying mark is detected in real time. If the quality of the spraying mark of the working nozzle does not meet the requirements, the standby nozzle is automatically switched as the working nozzle, and the problem nozzle is cleaned. After the cleaning is completed, the problem nozzle is used as the standby nozzle, and the spraying operation is continued until the spraying work is completed. The application can improve the spraying efficiency, the spraying quality and the equipment stability, reduce the frequency of production interruption, improve the automation degree of the production line, reduce the labor cost and the equipment maintenance cost, and does not need to rely on a supplementary spraying device, so that the hardware cost is reduced.

Description

Technical Field

[0001] This application relates to the field of inkjet printing technology, and in particular to an inkjet printing method, inkjet printing system and inkjet printing device. Background Technology

[0002] Inkjet printing is a process that uses software control and a printhead to print markings (such as QR codes, text, or images) onto products in a non-contact manner. The printhead uses charged ink particles deflected by a high-voltage electric field to print markings onto the substrate. It is a high-tech product integrating electromechanical systems and is widely used in industries such as food, pharmaceuticals, and tobacco.

[0003] Traditional inkjet printing processes cannot automatically switch printheads after positioning them according to product layout. When online inspection detects poor printing quality and printheads need cleaning, the printheads must be taken out of operation for cleaning before being put back into operation. Printhead problems are extremely common in the inkjet printing process, especially for large orders, where printheads need to be cleaned even more frequently.

[0004] For traditional offline inkjet printing equipment, stopping the machine to clean the printheads takes a lot of time.

[0005] For traditional inline gravure printing units, there are two ways to handle printhead cleaning if the machine is stopped. The first is to stop the gravure printing machine for printhead cleaning. When the gravure printing machine is restarted, the paper tension changes and registration tracking needs to be re-entered. This process is time-consuming, produces misregistration products, and seriously affects the performance of the gravure printing equipment. The second is to clean the printhead without stopping the gravure printing machine, removing the printhead from the working state. This will result in unprinted products. These unprinted products must either be discarded or reprinted using an offline printing device. This method heavily relies on the reprinting equipment, causing product waste, and also requires higher management of the splitting of the printed marking data. Summary of the Invention

[0006] This application aims to address the technical problems of low printing efficiency, product waste, and high hardware requirements caused by the need for shutdown to clean printheads or reliance on re-printing equipment in existing inkjet printing methods. It provides a printing method, printing system, and printing device with high printing efficiency that can save on product and hardware costs.

[0007] Specifically, this application provides a printing method, which uses a pre-set printing device equipped with at least two sets of printhead cleaning structures and printheads to perform printing operations. The printing method includes the following steps:

[0008] S100: Pre-set one printhead in each group of printing devices as the working printhead and the other printhead as the spare printhead.

[0009] S200: After the printhead starts printing, the current printing quality is detected in real time, and the printhead whose printing quality does not meet the printing requirements is identified as a problem printhead.

[0010] S300: Control the problematic printhead to stop its current printing operation and use the spare printhead as the working printhead to start printing operation after a preset printing time; at the same time, control the corresponding printhead cleaning structure to clean the problematic printhead, so that after cleaning, the problematic printhead can be used as the spare printhead.

[0011] S400: Determine whether the printing work has been completed. If yes, end the process; otherwise, return to step S200.

[0012] The above technical solution employs a pre-set printing device equipped with at least two sets of printhead cleaning structures and printheads. The printing quality is monitored in real time to ensure that the printing requirements are met. When a faulty printhead is detected, the device automatically switches to a backup printhead and cleans the faulty printhead before using it as a backup printhead, thereby enabling continuous printing. This method can improve printing efficiency and consistency and minimize the risk of production interruption.

[0013] This method simultaneously ensures printing quality and equipment stability, reduces the frequency of production interruptions, and improves production efficiency. Furthermore, by automatically iterating the entire workflow, this method can reduce manual operation and increase the automation level of the production line, thereby lowering labor costs and equipment maintenance costs.

[0014] In addition, this method does not require additional spraying equipment, which reduces hardware costs to some extent.

[0015] Furthermore, before performing step S100, the following steps are included:

[0016] Obtain the plate perimeter of the substrate, the imposition gripper length, and the number of first prints within the plate.

[0017] The first mark spacing between adjacent printed marks within the plate is calculated based on the plate perimeter, the imposition gripper length, and the first printing quantity. The second mark spacing between adjacent printed marks at the imposition gripper is calculated based on the first mark spacing and the imposition gripper length.

[0018] In the above technical solution, by calculating the spacing between adjacent printed marks within the plate and the spacing between adjacent printed marks at the plate gripper, the accuracy and consistency of the printing position can be ensured, avoiding the generation of defective products due to printing position offset or overlap, and improving the quality and stability of products on the production line.

[0019] Furthermore, before performing step S100, the following steps are also included:

[0020] The first preset number q is determined by interleaving the second number of prints within the printhead spacing at the cross-plate gripping area based on the first print count, and the second preset number p is determined by interleaving the third number of prints within the printhead spacing in the plate making process.

[0021] The nozzle spacing between the two nozzles is determined based on the first preset quantity q, the first marking spacing, and the panel gripping length, and / or based on the second preset quantity p and the first marking spacing.

[0022] Alternatively, the nozzle spacing can be adaptively set.

[0023] The above technical solution can ensure that the printing meets the requirements and there are no errors; at the same time, it can effectively reduce the scrap rate caused by printing errors, thus better guaranteeing the product quality on the production line.

[0024] Meanwhile, the nozzle spacing can also be adaptively set, improving the flexibility and scalability of printing.

[0025] Furthermore, before performing step S100, the following steps are also included:

[0026] Get the plate-making output speed.

[0027] The first printing interval t1 between adjacent printed marks within the plate is calculated based on the first mark spacing and the plate-making input speed, and the printing time difference Δt is calculated based on the printhead spacing and the plate-making input speed.

[0028] The second printing interval t2 of adjacent printed marks in the plate-making direction is calculated based on the first mark spacing, the plate-making gripper length, and the plate-making feed speed.

[0029] In the above technical solution, by calculating the printing interval time t1 based on the first mark spacing and the plate-making conveyor speed, the printing frequency can be accurately controlled, ensuring that the printing interval meets the requirements; by calculating the printing time difference Δt based on the printhead spacing and the plate-making conveyor speed, the printing coordination between multiple printheads can be ensured, avoiding printing overlap or misalignment; by accurately calculating the interval time t2 between adjacent printed marks at the plate-making conveyor in the plate-making conveyor direction, the printing speed and production efficiency can be improved, ensuring the continuity and stability of the printing work.

[0030] Furthermore, in step S300, after controlling the problematic printhead to stop the current printing operation, the method further includes: determining the preset printing duration based on the pre-set front and rear positions of the working printhead and the spare printhead, the first printing interval duration t1, the second printing interval duration t2, the printing time difference Δt, the first preset quantity q and the second preset quantity p, and the current printing plate making and printing completion status.

[0031] In the above technical solution, by determining the preset printing time according to the above parameters, the downtime of the production line can be reduced to the greatest extent, thereby improving production efficiency and reducing production stoppage losses.

[0032] Furthermore, determining the preset printing duration includes:

[0033] With the plate-making input direction as the front, when the preset spare printhead is in front of the working printhead, it is determined whether the printing in the current printing plate has been completed. If so, the preset printing time is t2+△t; otherwise, the preset printing time is t1+△t.

[0034] Furthermore, determining the preset printing duration includes:

[0035] When the preset working printhead is in front of the standby printhead, it is determined whether the printhead spacing is less than or equal to the first marked spacing. If the printhead spacing is less than or equal to the first marked spacing, it is determined whether the printing within the current printing plate has been completed. If the printing has been completed, the preset printing time is t2-Δt; otherwise, the preset printing time is t1-Δt.

[0036] If the nozzle spacing is greater than the first marking spacing, then it is determined whether the nozzle spacing is less than or equal to the second marking spacing. If the nozzle spacing is less than or equal to the second marking spacing, then it is determined whether the printing within the current printing plate has been completed. If the printing has been completed, the preset printing time is t2-Δt; otherwise, the preset printing time is (p+1)t1-Δt.

[0037] If the nozzle spacing is greater than the second marking spacing, it is determined whether the printing has been completed within the current printing plate. If the printing has been completed, the preset printing time is (q*t1+t2)-△t; otherwise, the preset printing time is (p+1)t1-△t.

[0038] In the above technical solution, the preset printing time is determined based on the position of the working printhead and whether printing has been completed in the current printing plate. This allows for flexible response to production needs based on actual conditions, ensuring smooth operation of the production line.

[0039] Based on the same concept, this application also provides a printing system, the printing system comprising:

[0040] Setting module: Used to pre-set any one printhead in each group of printing devices as the working printhead and the other printhead as the spare printhead.

[0041] The detection module is used to detect the current printing quality in real time after the printhead starts printing, and to identify printheads whose printing quality does not meet the printing requirements as problematic printheads.

[0042] Control module: Used to control the problematic printhead to stop its current printing operation and to use the spare printhead as the working printhead to start printing operation after a preset printing time; at the same time, it controls the corresponding printhead cleaning structure to clean the problematic printhead, so that after cleaning, the problematic printhead can be used as the spare printhead.

[0043] Judgment module: Used to determine whether the printing work has been completed, so as to end the process when the printing work is completed, and to transfer to the detection module when the printing work is not completed.

[0044] The above technical solutions effectively improve production efficiency, ensure production quality, simplify operating procedures, and enhance the stability of the production line through real-time quality monitoring, intelligent switching of working nozzles, and automated operation processes.

[0045] Furthermore, the printing system also includes:

[0046] First acquisition module: used to acquire the plate perimeter, imposition gripper length and first print quantity within the plate of the substrate, to calculate the first mark spacing between adjacent print marks within the plate based on the plate perimeter, imposition gripper length and first print quantity, and to calculate the second mark spacing between adjacent print marks within the imposition gripper based on the first mark spacing and the imposition gripper length.

[0047] The second acquisition module is used to determine, based on the first printing quantity, a second printing quantity interspersed within the printhead spacing at the cross-plate gripper as a first preset quantity q and a third printing quantity interspersed within the printhead spacing in the plate making as a second preset quantity p, and to determine the printhead spacing between the two printheads based on the first preset quantity q, the first marking spacing and the plate gripper length, and / or to determine the printhead spacing based on the second preset quantity p and the first marking spacing; or, to adaptively set the printhead spacing.

[0048] The third acquisition module is used to acquire the plate-making output speed, calculate the first printing interval t1 of adjacent printed marks within the plate-making process based on the first mark spacing and the plate-making output speed, calculate the printing time difference Δt based on the printhead spacing and the plate-making output speed, and calculate the second printing interval t2 of adjacent printed marks in the plate-making output direction based on the first mark spacing, the plate-making gripper length, and the plate-making output speed.

[0049] Determining module: used to determine the preset printing duration based on the pre-set front and rear positions of the working printhead and the standby printhead, the first printing interval duration t1, the second printing interval duration t2, the printing time difference Δt, the first preset quantity q, and the second preset quantity p.

[0050] In the above technical solution, by calculating relevant parameters, precise printing control can be achieved, ensuring the accurate position and spacing of the printed marks, and improving the quality and consistency of printing; and by calculating the preset printing time, the downtime of the production line can be reduced, and printing efficiency and capacity can be improved.

[0051] Based on the same concept, this application also provides a printing apparatus, which is equipped with at least two sets of printhead cleaning structures and printheads, and the printing apparatus is controlled by a printing system to control the printing apparatus to perform printing work by means of the printing system using the printing method described above.

[0052] Compared with the prior art, the beneficial effects of this application are as follows:

[0053] This application is based on a printing device equipped with at least two sets of printhead cleaning structures and printheads for printing operations. First, one printhead in each set of printing devices is pre-set as the working printhead, and the other printhead is set as the backup printhead. During the printing process, the quality of the printed markings is monitored in real time. If the quality of the printed markings from the working printhead is found to be unsatisfactory, the backup printhead is automatically switched to the working printhead, and the problematic printhead is cleaned. After cleaning, the problematic printhead is used as the backup printhead to continue the printing operation until the printing work is completed.

[0054] This application can improve printing efficiency and consistency, ensure printing quality and equipment stability, reduce the frequency of production interruptions, and improve production efficiency. At the same time, it can also reduce manual operation and increase the automation level of the production line, thereby reducing labor costs and equipment maintenance costs. In addition, the method does not rely on re-spraying equipment, which also reduces hardware costs to a certain extent. Attached Figure Description

[0055] Figure 1 This is a flowchart of the inkjet printing method described in this application.

[0056] Figure 2 To adopt Figure 1 A schematic diagram of the printing system framework for the aforementioned printing method. Detailed Implementation

[0057] This application provides a printing method, printing system, and printing device with high printing efficiency and cost savings on products and hardware, in order to solve the technical problems of low printing efficiency, product waste, and high hardware requirements caused by existing printing methods requiring downtime for printhead cleaning or reliance on re-printing equipment.

[0058] The following detailed description of a printing method, printing system, and printing apparatus according to this application, in conjunction with specific embodiments and accompanying drawings, provides further insight. Example 1:

[0059] Please see Figure 1 This application provides a printing method, which uses a pre-set printing device equipped with at least two sets of printhead cleaning structures and printheads to perform printing operations. The printing method includes the following steps:

[0060] S100: Pre-set one printhead in each group of printing devices as the working printhead and the other printhead as the spare printhead.

[0061] Furthermore, before performing step S100, the following steps are included:

[0062] Obtain the plate perimeter of the substrate, the imposition gripper length, and the number of first prints within the plate.

[0063] One feasible implementation assumes that the plate circumference m is 0.555m, the imposition gripper length n is 0.015m, and the first number of prints z within a plate is 6.

[0064] The first mark spacing between adjacent printed marks within the plate is calculated based on the plate perimeter, the imposition gripper length, and the first printing quantity. The second mark spacing between adjacent printed marks at the imposition gripper is calculated based on the first mark spacing and the imposition gripper length.

[0065] In this embodiment, based on the above settings, the first marker spacing l = (mn) / z = 0.09m and the second marker spacing l + n = 0.105m can be calculated.

[0066] Furthermore, before performing step S100, the following steps are also included:

[0067] The first preset number q is determined by interleaving the second number of prints within the printhead spacing at the cross-plate gripping area based on the first print count, and the second preset number p is determined by interleaving the third number of prints within the printhead spacing in the plate making process.

[0068] The nozzle spacing between the two nozzles is determined based on the first preset quantity q, the first marking spacing, and the panel gripping length, and / or based on the second preset quantity p and the first marking spacing.

[0069] Alternatively, the nozzle spacing can be adaptively set.

[0070] Where p = s / l (take the units digit); q = 1 + ((sn) / l) (take the units digit); s represents the nozzle spacing.

[0071] It should be noted that p and q are usually preferably 0. When switching printheads, there will be no unprinted areas within the printhead spacing, and the problematic printhead will not still need to print the printhead spacing quantity when there is a print quality problem (when the problematic printhead is in front of the spare printhead).

[0072] The nozzle spacing can be set by the person in charge of printing, but it is preferred that the nozzle spacing is less than or equal to the first marking spacing.

[0073] The comparison results between different printhead spacings and the first and second marking spacings correspond to different printing processing algorithms, and the printing personnel can select the appropriate printhead spacing according to the actual application requirements.

[0074] Furthermore, before performing step S100, the following steps are also included:

[0075] Get the plate-making output speed.

[0076] In this embodiment, it is assumed that the plate-making output speed v is 2.5 m / s.

[0077] The first printing interval t1 between adjacent printed marks within the plate is calculated based on the first mark spacing and the plate-making input speed, and the printing time difference Δt is calculated based on the printhead spacing and the plate-making input speed.

[0078] In this embodiment, the first printing interval duration t1 = l / v = 0.036s can be calculated.

[0079] The second printing interval t2 of adjacent printed marks in the plate-making direction is calculated based on the first mark spacing, the plate-making gripper length, and the plate-making feed speed.

[0080] In this embodiment, the second printing interval duration t2 = (l + n) / v = 0.042s can be calculated.

[0081] Based on the first printing interval t1 and the second printing interval t2, it can be seen that the printhead printing frequency is 6 times in the plate-making input direction as one cycle, where the printing interval for 1 time is 0.042s and the printing interval for 5 times is 0.036s, and printing is performed according to the cycle interval. That is, printing is performed periodically at intervals of 0.042s, 0.036 ...

[0082] After setting the working printhead and standby printhead in the initial printing state, the printing work can begin by executing step S200.

[0083] S200: After the printhead starts printing, the current printing quality is detected in real time, and the printhead whose printing quality does not meet the printing requirements is identified as a problem printhead.

[0084] Once the problematic nozzle is identified, step S300 can be executed.

[0085] S300: Control the problematic printhead to stop its current printing operation and use the spare printhead as the working printhead to start printing operation after a preset printing time; at the same time, control the corresponding printhead cleaning structure to clean the problematic printhead, so that after cleaning, the problematic printhead can be used as the spare printhead.

[0086] Furthermore, in step S300, after controlling the problematic printhead to stop the current printing operation, the method further includes: determining the preset printing duration based on the pre-set front and rear positions of the working printhead and the spare printhead, the first printing interval duration t1, the second printing interval duration t2, the printing time difference Δt, the first preset quantity q and the second preset quantity p, and the current printing plate making and printing completion status.

[0087] Furthermore, determining the preset printing duration includes:

[0088] With the plate-making input direction as the front, when the preset spare printhead is in front of the working printhead, it is determined whether the printing in the current printing plate has been completed. If so, the preset printing time is t2+△t; otherwise, the preset printing time is t1+△t.

[0089] It should be noted that, assuming the plate-making output direction is to the right at this time, the spare printhead on the right is the printhead in front.

[0090] In this embodiment, when the standby printhead in the initial printing state is in front of the working printhead, the printhead spacing, the first mark spacing and the second mark spacing have no effect on printhead switching. The printhead spacing s1 is set to 0.1m. At this time, the printing time difference Δt1=s1 / v=0.04s.

[0091] It should be noted that the printhead spacing s1 can be any value, not just limited to 0.1m; because the spare printhead is in front, after switching printheads, the spare printhead can continue the printing work that the previous working printhead did not finish, and the previous working printhead does not need to print the preset quantity again, and can directly enter the cleaning and standby state.

[0092] If printing has been completed within the current printing plate, i.e., the printhead is switched between two adjacent printing marks across the plate gripper, the original interval was 0.042s between the working printhead in the initial printing state and the working printhead in the initial printing state completing the last printing. However, since the working printhead needs to be switched to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing is t2+Δt1=0.042+0.04=0.082s. After the standby printhead enters the first printing, it immediately continues the previous cycle of the working printhead in the initial printing state.

[0093] If printing is not completed within the current printing plate, the printhead is switched between two adjacent printing marks within the plate. Originally, the working printhead in the initial printing state would continue printing every 0.036 seconds. However, since the working printhead needs to be switched to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing is t1 + Δt1 = 0.036 + 0.04 = 0.076 seconds. After the standby printhead enters the first printing, it immediately continues the previous cycle of printing from the working printhead in the initial printing state.

[0094] Furthermore, determining the preset printing duration includes:

[0095] When the preset working printhead is in front of the standby printhead, it is determined whether the printhead spacing is less than or equal to the first marked spacing. If the printhead spacing is less than or equal to the first marked spacing, it is determined whether the printing within the current printing plate has been completed. If the printing has been completed, the preset printing time is t2-Δt; otherwise, the preset printing time is t1-Δt.

[0096] In this embodiment, when the working printhead in the initial printing state is in front of the standby printhead, the printhead spacing, the first mark spacing, and the second mark spacing affect the printhead switching; the printhead spacing s2 is set to 0.075m, and at this time, the printing time difference Δt2=s2 / v=0.03s.

[0097] If the printhead spacing s is less than or equal to the first marking spacing l (in this case, there will be no printing markings interspersed between the two printheads, i.e., p1=0, q1=0), and the printing within the current printing plate has been completed, the working printhead in the initial printing state would normally continue printing every 0.042s. However, since the working printhead is switched to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing becomes t2-Δt2=0.042-0.03=0.012s. Therefore, in this case, since t2>t1, when switching printheads between two adjacent printing markings across the plate gripper, the interval time for the standby printhead to respond will be relatively longer. After the standby printhead enters the first printing, it immediately continues the previous cyclical pattern of the working printhead in the initial printing state.

[0098] If printing is not completed within the current printing plate, the working printhead in the initial printing state would normally continue printing every 0.036 seconds. However, since the working printhead needs to be switched to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing is t1-Δt2=0.036-0.03=0.006s. After the standby printhead enters the first printing, it immediately continues the previous cycle of printing from the working printhead in the initial printing state.

[0099] When the working printhead in the initial printing state is in front of the standby printhead, if the printhead spacing is greater than the first marked spacing, it is determined whether the printhead spacing is less than or equal to the second marked spacing. If the printhead spacing is less than or equal to the second marked spacing, it is determined whether the printing within the current printing plate has been completed. If the printing has been completed, the preset printing time is t2-Δt; otherwise, the preset printing time is (p+1)t1-Δt.

[0100] In this embodiment, if the printhead spacing s is greater than the first marking spacing l, it is determined whether the printhead spacing s is less than or equal to the second marking spacing l+n. If so, it is further determined whether the printing within the current printing plate has been completed. In this case, there will be no printing markings interspersed between the two printheads at the cross-plate gripper, i.e., q2=0, but there will be printing markings p2 interspersed within the printhead spacing in the plate. The printhead spacing s3 is set to 0.1m. At this time, the printing time difference Δt3=s3 / v=0.04s.

[0101] Where p2 = 0.1 / 0.09 (take the units digit) = 1.

[0102] If printing has been completed within the current printing plate, q2=0. Originally, the working printhead in the initial printing state would continue printing every 0.042s. However, since the working printhead needs to be switched to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing is t2-Δt3=0.042-0.04=0.002s. After the standby printhead enters the first printing, it immediately continues the previous cycle of printing from the working printhead in the initial printing state.

[0103] If the printing process is not completed within the current printing plate, the working printhead in the initial printing state would normally continue printing every 0.036 seconds. However, since the working printhead needs to switch to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing when the printhead switching action is determined is (p2+1)t1-△t3=(1+1)*0.036-0.04=0.032s. At this time, the working printhead in the initial state still needs to print once more to finish the printing work. After the standby printhead enters the first printing, it immediately continues the periodic pattern of the working printhead in the initial printing state after adding one more time.

[0104] It should be noted that the last print job completed by the printhead in the initial printing state when the printhead switching action is initiated is not the same as the last print job of that printhead; only the one print job that continues during the switching process is considered the last print job of the printhead in the initial printing state.

[0105] When the working printhead in the initial printing state is in front of the standby printhead, if the printhead spacing is greater than the second marking spacing, it is determined whether the printing within the current printing plate has been completed. If the printing has been completed, the preset printing time is (q*t1+t2)-△t; otherwise, the preset printing time is (p+1)t1-△t.

[0106] In this embodiment, if the printhead spacing s is greater than the second marking spacing l+n, then q3 markings will be interspersed within the printhead spacing at the cross-plate gripper, and p3 markings will be interspersed within the printhead spacing in the plate making process; the printhead spacing s4 is set to 0.2m, and at this time, the printing time difference Δt4=s4 / v=0.08s.

[0107] Where p3 = 0.2 / 0.09 (take the units digit) = 2, q3 = 1 + ((0.2 - 0.105) / 0.09 (take the units digit) = 2.

[0108] If the printing plate has already finished printing, q3=2. Originally, the working printhead in the initial printing state would continue printing every 0.042s. However, since the working printhead needs to switch to the standby printhead, the time interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing when the printhead switching action is determined is (q3*t1+t2)-△t4=(2*0.036+0.042)-0.08=0.034s. After the standby printhead enters the first printing, it immediately continues the printing cycle of the working printhead in the initial printing state after adding 2 times. The working printhead in the initial printing state still prints 2 times according to the original cycle before the printing work ends.

[0109] If printing is not completed within the current printing plate, the working printhead in the initial printing state would normally continue printing every 0.036 seconds. However, since the working printhead needs to switch to the standby printhead, the interval between the standby printhead entering the first printing and the working printhead in the initial printing state completing the last printing when the printhead switching action is determined is (p3+1)t1-△t4=(2+1)*0.036-0.08=0.028s. After the standby printhead enters the first printing, it immediately continues the printing cycle of the working printhead in the initial printing state after adding 2 times. The working printhead in the initial printing state still prints 2 times according to the original cycle before the printing work ends.

[0110] In addition, it should be noted that if the pre-set working printhead is in front of the standby printhead, the printhead spacing is preferably less than or equal to the first marking spacing. In this case, there will be no printed markings interspersed at the plate gripping area and within the printhead spacing.

[0111] After designating the problematic nozzle as a backup nozzle, step S400 can be executed.

[0112] S400: Determine whether the printing work has been completed. If yes, end the process; otherwise, return to step S200.

[0113] In this embodiment, if all printing plates have been printed with the printing mark, it means that the current printing work has been completed, and the printing process can be ended at this time; if it has not been completed, printing needs to continue, and the process returns to step S200 to iterate until the printing work is completed, and then the process ends. Example 2:

[0114] Please see Figure 2 This application also provides a printing system, the printing system comprising:

[0115] Setting module: Used to pre-set any one printhead in each group of printing devices as the working printhead and the other printhead as the spare printhead.

[0116] The detection module is used to detect the current printing quality in real time after the printhead starts printing, and to identify printheads whose printing quality does not meet the printing requirements as problematic printheads.

[0117] Control module: Used to control the problematic printhead to stop its current printing operation and to use the spare printhead as the working printhead to start printing operation after a preset printing time; at the same time, it controls the corresponding printhead cleaning structure to clean the problematic printhead, so that after cleaning, the problematic printhead can be used as the spare printhead.

[0118] Judgment module: Used to determine whether the printing work has been completed, so as to end the process when the printing work is completed, and to transfer to the detection module when the printing work is not completed.

[0119] Furthermore, the printing system also includes:

[0120] First acquisition module: used to acquire the plate perimeter, imposition gripper length and first print quantity within the plate of the substrate, to calculate the first mark spacing between adjacent print marks within the plate based on the plate perimeter, imposition gripper length and first print quantity, and to calculate the second mark spacing between adjacent print marks within the imposition gripper based on the first mark spacing and the imposition gripper length.

[0121] The second acquisition module is used to determine, based on the first printing quantity, a second printing quantity interspersed within the printhead spacing at the cross-plate gripper as a first preset quantity q and a third printing quantity interspersed within the printhead spacing in the plate making as a second preset quantity p, and to determine the printhead spacing between the two printheads based on the first preset quantity q, the first marking spacing and the plate gripper length, and / or to determine the printhead spacing based on the second preset quantity p and the first marking spacing; or, to adaptively set the printhead spacing.

[0122] The third acquisition module is used to acquire the plate-making output speed, calculate the first printing interval t1 of adjacent printed marks within the plate-making process based on the first mark spacing and the plate-making output speed, calculate the printing time difference Δt based on the printhead spacing and the plate-making output speed, and calculate the second printing interval t2 of adjacent printed marks in the plate-making output direction based on the first mark spacing, the plate-making gripper length, and the plate-making output speed.

[0123] Determining module: used to determine the preset printing duration based on the pre-set front and rear positions of the working printhead and the standby printhead, the first printing interval duration t1, the second printing interval duration t2, the printing time difference Δt, the first preset quantity q, and the second preset quantity p. Example 3:

[0124] This application also provides a printing apparatus, which is equipped with at least two sets of printhead cleaning structures and printheads, and the printing apparatus is controlled by a printing system to control the printing apparatus to perform printing work by means of the printing system using the printing method described above.

[0125] In summary, this application provides a printing method, printing system, and printing device. Printing is performed using a pre-set printing device equipped with at least two sets of printhead cleaning structures and printheads. Each set of printheads is pre-configured with one printhead as the working printhead and the other as a backup printhead. During printing, the quality of the printed markings is monitored in real time. If the quality of the working printhead is found to be unsatisfactory, the backup printhead is automatically switched to the working printhead, and the problematic printhead is cleaned. After cleaning, the problematic printhead is used as the backup printhead to continue printing until the printing is completed. This application can improve printing efficiency and consistency, ensure printing quality and equipment stability, reduce the frequency of production interruptions, and improve production efficiency. It can also reduce manual operation and increase the automation level of the production line, thereby reducing labor costs and equipment maintenance costs. Furthermore, this method does not rely on re-printing equipment, thus reducing hardware costs to some extent.

[0126] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0127] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0128] Although the description of this application has been made in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the foregoing. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A method of inkjet printing, characterized by, The printing method comprises the following steps: S100: obtaining the plate-making perimeter, the plate-making bite length, and the first printing quantity in the plate-making; calculating the first identification interval of adjacent printing marks in the plate-making according to the plate-making perimeter, the plate-making bite length, and the first printing quantity; and calculating the second identification interval of adjacent printing marks in the plate-making bite according to the first identification interval and the plate-making bite length; According to the first printing quantity, the second printing quantity inserted in the interval of the nozzle spacing across the plate-making bite is determined as a first preset quantity q, and the third printing quantity inserted in the interval of the nozzle spacing in the plate-making is determined as a second preset quantity p; the nozzle spacing of the two nozzles is determined according to the first preset quantity q, the first identification interval, and the plate-making bite length, and / or the nozzle spacing is determined according to the second preset quantity p and the first identification interval; Obtaining the plate-making conveying speed; calculating the first printing interval time t1 of adjacent printing marks in the plate-making according to the first identification interval and the plate-making conveying speed, and calculating the printing time difference Δt according to the nozzle spacing and the plate-making conveying speed; calculating the second printing interval time t2 of adjacent printing marks in the plate-making bite in the plate-making conveying direction according to the first identification interval, the plate-making bite length, and the plate-making conveying speed; And, any nozzle in each group of printing devices is preset as a working nozzle, and the other nozzle is preset as a standby nozzle; S200: after the working nozzle starts the printing work, the quality of the current printing mark is detected in real time to determine the working nozzle with the printing mark quality not meeting the printing requirement as a problem nozzle; S300: controlling the problem nozzle to stop the current printing work, determining the preset printing time length according to the front and back positions of the working nozzle and the standby nozzle, the first printing interval time t1, the second printing interval time t2, the printing time difference Δt, the first preset quantity q, and the second preset quantity p, and the plate-making printing completion state of the current printing; and taking the standby nozzle as the working nozzle to start the printing work after the preset printing time length; meanwhile, the corresponding nozzle cleaning structure is controlled to clean the problem nozzle, and after the cleaning is completed, the problem nozzle is taken as the standby nozzle; Wherein, the plate-making conveying direction is the front, when the preset standby nozzle is in front of the working nozzle, it is determined whether the plate-making in the current printing has been completed, if yes, the preset printing time length is t2+Δt; otherwise, the preset printing time length is t1+Δt; Or, when the preset working nozzle is in front of the standby nozzle, it is determined whether the nozzle spacing is less than or equal to the first identification interval, if the nozzle spacing is less than or equal to the first identification interval, it is determined whether the plate-making in the current printing has been completed, if yes, the preset printing time length is t2-Δt; otherwise, the preset printing time length is t1-Δt; If the nozzle spacing is greater than the first identification spacing, it is determined whether the nozzle spacing is less than or equal to the second identification spacing. If the nozzle spacing is less than or equal to the second identification spacing, it is determined whether the current printing in the plate making is completed. If the printing is completed, the preset printing duration is t2-△t; otherwise, the preset printing duration is (p+1)t1-△t. If the nozzle spacing is greater than the second identification spacing, it is determined whether the current printing in the plate making is completed. If the printing is completed, the preset printing duration is (q*t1+t2)-△t; otherwise, the preset printing duration is (p+1)t1-△t. S400: It is determined whether the printing is completed. If yes, the process is ended; otherwise, the process returns to step S200.

2. A printing system employing the printing method according to claim 1, characterized by The printing system comprises: A setting module is configured to set any nozzle in each group of printing devices as a working nozzle and another nozzle as a standby nozzle. A detection module is configured to detect the quality of the printing mark in real time after the working nozzle starts the printing work, so as to regard the working nozzle with the printing mark quality not meeting the printing requirement as a problem nozzle. A control module is configured to control the problem nozzle to stop the current printing work, regard the standby nozzle as the working nozzle, and start the printing work after a preset printing duration; meanwhile, the control module controls the corresponding nozzle cleaning structure to clean the problem nozzle, and regards the problem nozzle as the standby nozzle after the cleaning is completed. A judgment module is configured to determine whether the printing is completed, so as to end the process when the printing is completed, and return to the detection module when the printing is not completed.

3. The printing system of claim 2, wherein, The printing system further comprises: A first acquisition module is configured to acquire the plate making circumference, the plate making bite length, and the first printing quantity in the plate making, calculate the first identification spacing of adjacent printing marks in the plate making according to the plate making circumference, the plate making bite length, and the first printing quantity, and calculate the second identification spacing of adjacent printing marks in the plate making bite according to the first identification spacing and the plate making bite length. A second acquisition module is configured to determine the second printing quantity inserted in the nozzle spacing across the plate making bite as a first preset quantity q and the third printing quantity inserted in the nozzle spacing in the plate making as a second preset quantity p according to the first printing quantity, determine the nozzle spacing of two nozzles according to the first preset quantity q, the first identification spacing, and the plate making bite length, and / or determine the nozzle spacing according to the second preset quantity p and the first identification spacing; or, the nozzle spacing is adaptively set. A third acquisition module is configured to acquire the plate making conveying speed, calculate the first printing interval duration t1 of adjacent printing marks in the plate making according to the first identification spacing and the plate making conveying speed, calculate the printing time difference △t according to the nozzle spacing and the plate making conveying speed, and calculate the second printing interval duration t2 of adjacent printing marks in the plate making bite in the plate making conveying direction according to the first identification spacing, the plate making bite length, and the plate making conveying speed. The determining module is configured to determine the preset printing time according to the front and back positions of the working nozzle and the standby nozzle, the first printing interval time t1, the second printing interval time t2, the printing time difference Δt, the first preset number q and the second preset number p.

4. A jet printing apparatus characterized by comprising: The printing device is loaded with at least two groups of nozzle cleaning structures and nozzles, and the printing device is controlled by a printing system, so that the printing device is controlled by the printing system to perform printing work by using the printing method of claim 1.

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