A method for precise calibration of a printing device, a printing device and a storage medium

Abstract

This invention relates to a precise calibration method, printing device, and storage medium for a printing apparatus, belonging to the field of high-precision image printing technology. The invention calculates the distance between adjacent nozzle groups, precisely steps the printing platform using control pulses, and calibrates using an encoder to ensure accuracy. When printing a reference pattern, a multi-line pattern is used to facilitate subsequent comparison and calibration. Furthermore, by calling the corresponding nozzle group and its adjacent nozzle groups for comparison pattern printing, and then comparing which of the multiple comparison patterns has the smallest difference from the reference pattern, the actual offset is calculated based on the offset of the number of nozzle groups, and the pulse compensation value is calculated. This avoids errors that may occur due to manual measurement, further improving printing accuracy. This invention indirectly achieves precise measurement by utilizing the distance between nozzle groups, improving measurement accuracy to the micrometer level and greatly enhancing compensation accuracy.

Description

Technical Field

[0001] This invention relates to the field of high-precision image printing technology, specifically to a precise calibration method for a printing device, a printing device, and a storage medium. Background Technology

[0002] High-precision flatbed printing equipment: such as UV flatbed printers and direct glass / ceramic inkjet printers, which require high-precision industrial printing and extremely high printing accuracy. Figure 1 The diagram illustrates a printing device. The device includes a printing carriage and a printing platform, and also includes a stepper motor with an encoder for driving the printing platform to move along the X-direction. The printing carriage includes a print head and can move along the Y-direction, with the X-direction approximately perpendicular to the Y-direction. The X-direction can also be referred to as the first direction, and the Y-direction as the second direction. In use, the printing device first moves the printing carriage to a predetermined position on its track, calibrates and fixes it, and then the printing carriage moves along the track along the Y-direction. Meanwhile, the printing platform steps along the X-direction to achieve printing.

[0003] In existing printing equipment, the movement of the printing platform relies on a stepper motor driving a transmission chain (not shown) to move the printing platform. Existing technologies rely heavily on manual experience or coarse linear compensation for systematic errors between the stepper motor and the transmission chain, lacking a digital error compensation mechanism.

[0004] Even after the printing platform is installed and calibrated, its actual printing results still need to be digitally calibrated. Current calibration methods involve printing a reference pattern, moving it a predetermined distance, printing a comparison pattern, and then manually measuring the distance between the printed reference and comparison patterns to perform digital calibration. However, these methods are insufficient for achieving high-precision calibration.

[0005] In addition, existing printing equipment typically has multiple printing platforms to make more efficient use of the printhead. For dual-platform printing equipment, besides the calibration issues mentioned above, the following problems also exist: Lack of high-precision multi-platform coordination capability: Traditional dual-platform solutions often use independent control or simple master-slave control, which cannot effectively solve the error problem between the two platforms in high-speed movement, resulting in low accuracy in the synchronization mode and difficulty in meeting the needs of high-quality printing.

[0006] Limited functionality and operational efficiency. Traditional equipment typically only supports a single synchronous or asynchronous mode, lacking the ability to switch between multiple modes and schedule multiple tasks in parallel, resulting in low production efficiency when dealing with multi-variety, small-batch orders.

[0007] Therefore, there is an urgent need for a precise calibration method for printing equipment, printing equipment, and storage media to solve at least one of the above problems. Summary of the Invention

[0008] To alleviate or solve at least one aspect or point of the above-mentioned problems, the present invention is proposed. The present invention provides a precise calibration method for a printing device, the printing device including a printing carriage and a printing platform, and further including a stepper motor with an encoder for driving the printing platform to move along the X direction. The printing carriage includes a print head and is movable along the Y direction, with the X direction being approximately perpendicular to the Y direction. The method includes the following steps: obtaining the print head height, wherein the print head height is... ; The distance between adjacent groups of holes in the nozzle is measured as KS; The distance traveled by the platform for each received pulse is measured in PS. Reference pattern printing: At the first position of the platform, multiple hole groups are called to print multiple lines of reference pattern A on the printing medium. The multiple hole groups are respectively denoted as DK1, DK2, ..., DKn, and the printed patterns are respectively denoted as T1, T2, ..., Tn; where n>=2, and n is a natural number. For pattern group printing: the stepper motor executes X1 pulses, and an encoder is used for calibration; it is determined that executing X1 pulses corresponds to a theoretical hole group offset of SX1, where... ; Call DK1+SX1, DK2+SX1, ..., DKn+SX1 as calibration hole groups and hole groups that are offset by 1 to M holes from the calibration hole groups respectively to print reference pattern groups. The reference pattern groups are respectively denoted as D0-M...D0-1, D0, D0+1...D0+M, where M>=1 and M is a natural number. Where DK1+SX1, DK2+SX1, ..., DKn+SX1 represent the hole groups corresponding to DK1, DK2, ..., DKn offset by SX1 hole groups; By comparing the control pattern group with the reference pattern group, the optimal control pattern and the number of offset holes and offset direction corresponding to the optimal control pattern are determined. Adjust the number of pulses based on the number of offset holes and the offset direction.

[0009] Preferably, adjusting the number of pulses based on the number of offset holes and the offset direction includes: calculating the number of pulses Lhpulse required by the stepper motor for the printing platform to move one nozzle height; and calculating the number of pulses that need to be adjusted for the printing platform to move one nozzle height.

[0010] Preferably, the stepper motor executing X1 pulses includes: the stepper motor executing multiple pulses, the sum of the multiple pulses being X1.

[0011] Preferably, X1=Lhpulse, the stepper motor executing multiple pulses includes: the stepper motor first executing... X1 pulses, then execute X1 pulses, then execute again. X1 pulses.

[0012] Preferably, the printing platform includes platform A and platform B; the printing device can switch between different printing modes, including: single-platform mode, dual-platform asynchronous mode and dual-platform synchronous mode.

[0013] Preferably, the single-platform mode specifically means that either platform A or platform B works independently.

[0014] Preferred dual-platform asynchronous mode: Platform A and Platform B work independently, starting tasks through their respective signal triggers to achieve basic parallel operations.

[0015] Preferred dual-platform synchronization mode: The motion of either platform A or platform B is fully synchronized.

[0016] The present invention also provides a printing device employing the aforementioned precise calibration method.

[0017] The present invention also provides a storage medium having a computer program stored thereon, the computer program being used to execute the precision calibration method or the control method described in any of the preceding claims.

[0018] This invention calculates the distance between adjacent nozzle groups, uses pulses to precisely step the printing platform, and employs an encoder for calibration to ensure accuracy. When printing reference patterns, a multi-line pattern is used to facilitate subsequent comparison and calibration.

[0019] This invention prints a reference pattern by calling the corresponding hole group and adjacent hole groups before and after it, comparing which reference pattern has the smallest difference from the reference pattern. The actual offset is then calculated based on the offset of the hole groups, leading to the calculation of the pulse compensation value. This avoids errors that may occur with manual measurement, further improving printing accuracy. By utilizing the distance between hole groups, this invention indirectly achieves precise measurement, improving measurement accuracy to the micrometer level and significantly enhancing compensation accuracy.

[0020] The precise calibration method of the present invention can be further applied to dual-platform printing equipment. Through single-platform mode, dual-platform asynchronous mode, dual-platform synchronous mode and dual-platform asynchronous independent printing mode, high-precision printing of dual-platform printing equipment can be achieved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a printing device as an exemplary embodiment of the present invention.

[0022] Figure 2This is a schematic diagram of a nozzle, which is an exemplary embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of a reference pattern and a comparison pattern for an exemplary embodiment of the present invention.

[0024] Figure 4 This is an interface diagram of a single-platform printing mode, which is an exemplary embodiment of the present invention.

[0025] Figure 5 This is an interface diagram of a dual-platform asynchronous independent printing mode, which is an exemplary embodiment of the present invention.

[0026] Figure 6 This is an interface diagram of a dual-platform synchronous independent printing mode, which is an exemplary embodiment of the present invention.

[0027] Figure 7 This is a schematic flowchart of a precise calibration method for a printing device, which is an exemplary embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of calibration verification of a reference pattern and a control pattern for an exemplary embodiment of the present invention (multiple pulse printing is performed).

[0029] Wherein: 10-Platform A, 20-Platform B, 30-Nozzle, 40-Railway A, 50-Railway B, 60-Railway C. Detailed Implementation

[0030] The following description of embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the invention and should not be construed as a limitation thereof. In this invention, the same reference numerals denote the same or similar parts.

[0031] The features described herein may be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways in which the methods, apparatuses, and / or systems described herein will become clear upon understanding the disclosure of the invention.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] To enable those skilled in the art to utilize the content of this invention, the following exemplary embodiments may be provided in conjunction with specific application scenarios, specific systems, device and component parameters, and specific connection methods. However, these embodiments are merely examples for those skilled in the art, and the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this invention.

[0034] According to an exemplary embodiment of the present invention: Figures 1-7 As shown, the present invention provides a calibration method for a printing device, such as... Figure 1 The diagram illustrates a printing device. The printing device includes a printing carriage and a printing platform, and also includes a stepper motor with an encoder for driving the printing platform to move along the X direction. The printing carriage includes a print head and can move along the Y direction, with the X direction being approximately perpendicular to the Y direction. The X direction can also be referred to as the first direction, and the Y direction as the second direction. In use, the printing device first moves the track C containing the printing carriage to a predetermined position, calibrates and fixes it, and then the printing carriage moves along the Y direction on a third track. The printing platform then steps along the X direction to achieve printing. Preferably, the present invention has two printing platforms, namely platform A and platform B. Platform A can move on track A, and platform B can move on track B.

[0035] like Figure 2 The diagram illustrates a printhead comprising multiple sets of orifices, with each schematically shown group containing four nozzles. These four nozzles can be connected to cyan (C), magenta (M), yellow (Y), and black (K) inks, respectively. Different colors can be created by superimposing these inks. The smaller the distance between adjacent orifice groups, the smaller the nozzle diameter, and thus the higher the accuracy. For example, the G5 printhead has four sets of 320 channels operating simultaneously, with an adjacent orifice spacing of approximately 169 micrometers, achieving a physical resolution of 600 dpi. This invention indirectly achieves micrometer-level precision measurement by utilizing the spacing between adjacent orifice groups, thus improving calibration accuracy.

[0036] According to an exemplary embodiment of the present invention: In a printing device, a stepper motor drives the printing platform to move via a transmission chain. To prevent missed steps or overshoot, when a pulse is applied to the stepper motor, its theoretical rotation angle is denoted as 'a', where 'a' is the step angle, and the number of pulses required for one revolution is 360 / a. In actual operation, because the stepper motor is driven forward by the transmission chain, its actual rotation angle may be less than the above angle (missed steps) or greater than the above angle (overshoot). Therefore, an encoder is usually added to the stepper motor for calibration. The encoder can detect the actual rotation angle of the stepper motor and transmit it to the controller for calibration, so that the stepper motor can accurately rotate to the predetermined angle. Taking high-precision inkjet printing as an example, a step angle of 1.8 degrees or lower can usually be selected, and then combined with high microstepping, such as 64 microstepping, so that the number of pulses per revolution can reach more than 10,000, thereby providing sufficient accuracy adjustment in the Y direction.

[0037] According to an exemplary embodiment of the present invention: Figures 1-8 As shown, for a printing device, after installation, the stepper motor advances a fixed distance for each pulse received by the printing platform. Therefore, by controlling the pulses, the distance the platform advances can be precisely adjusted. For example, during normal printing, the stepper motor typically needs to rotate multiple times, while the printing platform can advance a distance equivalent to 1 / 4 of the printhead height in a single stroke.

[0038] According to an exemplary embodiment of the present invention: Figure 7 As shown, the precise calibration method of the present invention includes the following steps: obtaining the nozzle height, where the nozzle height gauge is L. The nozzle height is the distance between the uppermost and lowermost hole groups along the length of the nozzle. The main parameters of the nozzle include the number of nozzle holes and the resolution. The nozzle height can be obtained based on the number of nozzle holes and the resolution. For example, if the total number of nozzle holes is 1600, each hole group has four holes, the number of hole groups KZS = 400 holes, and the resolution is 400 holes / inch, then the nozzle height is 1 inch. Optionally, the nozzle height can also be obtained directly by measurement.

[0039] The distance between adjacent groups of holes in the nozzle is denoted as KS. Since the distance between adjacent groups of holes in the nozzle is the same, the distance KS between adjacent groups of holes can be calculated based on the nozzle height L and the number of groups of holes KZS. .

[0040] The distance the platform moves for each received pulse is measured as PS. For example, after the printing equipment is installed, a pulse count signal is sent to the stepper motor to move the platform forward a certain distance. The distance moved forward is measured and divided by the pulse count to obtain PS.

[0041] Calculate the number of pulses (Lhpulse) required by the stepper motor to move the printing platform one nozzle height. In actual printing, the feed distance of the printing platform for each step is typically determined based on the printhead height L. For example, the feed distance of the printing platform for each step could be... L, L, etc., therefore, stepper motors typically perform... , This will achieve the aforementioned feed distance.

[0042] Reference pattern printing: At the first position of the printing platform, multiple hole groups are used to print multiple lines of reference pattern A on the printing medium. The multiple hole groups are denoted as DK1, DK2, ..., DKn, and the printed patterns are denoted as T1, T2, ..., Tn, where n>=2 and n is a natural number. Preferably, the multiple hole groups are not adjacent, which facilitates subsequent observation and comparison.

[0043] For pattern group printing: the stepper motor executes X1 pulses, and an encoder is used for calibration; it is determined that executing X1 pulses corresponds to a theoretical hole group offset of SX1, where... .

[0044] Use DK1+SX1, DK2+SX1, ..., DKn+SX1 as calibration hole groups, and print reference pattern groups for hole groups offset by 1 to M from the calibration hole groups. These reference pattern groups are denoted as D0-M...D0-1, D0, D0+1...D0+M, where M>=1 and M is a natural number. D0 corresponds to the pattern printed by DK1+SX1, DK2+SX1, ..., DKn+SX1, and D0-1 corresponds to the pattern offset by one from the calibration hole groups. The hole printing pattern, D0+1, corresponds to the pattern of DK1+SX1, DK2+SX1, ..., DKn+SX1 shifted forward by one hole, where "forward" refers to the direction in which the printing platform moves forward, and "backward" refers to the direction in which the printing platform moves backward, and so on. D0-M corresponds to the pattern of DK1+SX1, DK2+SX1, ..., DKn+SX1 shifted backward by M holes, and D0+M corresponds to the pattern of DK1+SX1, DK2+SX1, ..., DKn+SX1 shifted forward by M holes. Here, DK1+SX1, DK2+SX1, ..., DKn+SX1 represent the hole groups corresponding to DK1, DK2, ..., DKn shifted by SX1 holes.

[0045] For example, such as Figure 2 As shown, assuming Figure 2The hole group shown in Figure 71 is used as a reference pattern for printing. After the stepper motor executes X1 pulses, the corresponding hole group offset is recorded as SX1. The offset hole group 71A is obtained through the hole group offset SX1, and then 71A is called to print the reference pattern. The M adjacent hole groups before and after 71A are also called to print the reference patterns.

[0046] like Figure 3 As shown, exemplarily, the reference pattern consists of multiple rows of parallel line segments, schematically five rows. Preferably, for ease of distinction, the reference pattern and the control pattern are identical, with the same position in the X-direction, offset only in the Y-direction, thus partially overlapping for easier judgment. Preferably, the reference pattern is also in multiple groups, such as 2M+1 groups, spaced apart in the Y-direction. The corresponding control pattern group is also 2M+1 groups, with the control pattern and the corresponding reference pattern at least partially overlapping in the Y-direction.

[0047] For example, such as Figure 3 As shown, there are a total of 11 sets of reference patterns ( Figure 3 Each group contains 5 line segments on the left, all with identical patterns, and these groups are spaced apart in the Y direction (e.g., the pattern marked -5 is spaced apart from the pattern marked -4 in the Y direction). There are also 11 corresponding reference pattern groups, spaced apart in the Y direction. Furthermore, each reference pattern at least partially overlaps with its corresponding reference pattern in the Y direction (e.g., ...). Figure 3 The pattern corresponding to -5 in the diagram, the reference pattern and the control pattern partially overlap in the Y direction, making it easy to determine their relative positions, and thus making it easy to determine which one is the optimal number of offset holes.

[0048] Figure 3 In the diagram, pattern 0 represents the reference pattern for 71A, -1 represents the pattern of 71A shifted backward by one hole group, +1 represents the pattern of 71A shifted forward by one hole group, and so on. By comparing the overlap between the reference pattern and the reference pattern, the optimal number of shifted hole groups is determined. By comparing the reference pattern group with the reference pattern, the optimal reference pattern and the corresponding number of shifted holes and shift direction are determined.

[0049] Adjust the number of pulses based on the number of offset holes and the offset direction. (Illustrative example, such as...) Figure 3 As shown, if 0 corresponds to the optimal pattern group, no adjustment is needed. Figure 3 As shown, taking the comparison pattern (-1) and reference pattern as examples, setting five reference patterns in the diagram allows for better comparison with the comparison pattern. Compared to setting only one reference pattern, the differences between the two can be more clearly distinguished. Assuming the number of offset holes is PYS, where the direction of the offset number aligned with the printing platform movement is +, then corresponding to X1 pulses, the adjusted pulse count is: Conversely, if it is the opposite direction, the adjusted pulse count is... .

[0050] According to an exemplary embodiment of the present invention: adjusting the pulse count includes: calculating the number of pulses required to adjust the printing platform to move one printhead height L. , among them The value of the sign is determined by the offset direction. It should be noted that when calculating the pulse count, if there are non-integer cases, the integer part is rounded off. In actual industrial printing systems, the default adjustment of the pulse count is to move the printhead by one height, thus adjusting the number of pulses accordingly. Therefore, by calculating the adjustable pulse count for one printhead height, it can be directly applied to the software system.

[0051] According to an exemplary embodiment of the present invention: the stepper motor executing X1 pulses includes the stepper motor executing multiple pulses, the sum of which is X1. In actual pulse control, the number of pulses Lhpulse corresponding to the platform traveling a distance L of one nozzle height is usually used as the basic control parameter. According to an exemplary embodiment of the present invention: X1 = Lhpulse, the stepper motor first executes... One pulse, then execute One pulse, then execute again. Each pulse. This method allows for precise simulation of actual operating conditions, improving calibration accuracy.

[0052] According to an exemplary embodiment of the present invention, in order to ensure printing accuracy, the method further includes the following step: Origin retrieval: Before each printing, the printing platform first returns to the system-preset "origin" position. The origin position is the initial calibration position of the printing platform. By returning the printing platform to the "origin" position before each printing, calibration accuracy can be improved.

[0053] According to an exemplary embodiment of the present invention, the method further includes the step of calibrating the position of the printing carriage using a grating ruler. The printing carriage moves on a track, and the position of the printing carriage can be calibrated using the grating ruler.

[0054] According to an exemplary embodiment of the present invention: Figure 1 As shown, the present invention also provides a control method for a dual-platform printing device, wherein the printing platform includes platform A and platform B, platform A can move on track A, and platform B can move on track B. The method further includes the following steps: the printing device can switch between different printing modes, including: single-platform mode, dual-platform synchronous mode, and dual-platform asynchronous independent printing mode.

[0055] According to an exemplary embodiment of the present invention, the single-platform mode specifically means that platform A or platform B works independently, that is, only one printing platform works, such as platform A or platform B.

[0056] According to an exemplary embodiment of the present invention, the dual-platform asynchronous mode allows two platforms to operate independently, each initiating a task via its own signal trigger to achieve basic parallel operation. In the dual-platform asynchronous independent printing mode, when adding images, the user needs to pre-select the platform area (platform A or platform B) for the current job to print. When a signal arrives, the software will select the appropriate platform for printing based on the signal type.

[0057] According to an exemplary embodiment of the present invention: Dual-platform synchronous mode: the movement of the two platforms is completely synchronized, realizing unified printing of large size or high precision. If the printing medium is large, part of the printing medium can be placed on platform A and part on platform B, and printing can be achieved based on the synchronous movement of platform A and platform B.

[0058] To address the accuracy issues arising from the simultaneous movement of two platforms in a dual-platform synchronous printing mode, a high-precision cross-coupling control (CCC) method is preferably employed. Specifically, both the stepper motors on platform A and platform B are equipped with encoders to provide real-time feedback on their position information. Based on this position information, the system receives the position difference between the two platforms in the X-direction. The speed commands of the two motors are adjusted in real-time according to the magnitude of this difference to maintain synchronization. Specifically, if the difference exceeds the tolerance range, the coupling controller increases the speed command to the lagging motor and decreases the speed command to the leading motor, dynamically bringing the two platforms back to a synchronized state. This method allows the two platforms to accurately and synchronously reach the target position, significantly improving the accuracy and reliability of synchronized movement.

[0059] like Figure 4-6 As shown, the control operation interface of the control method for the dual-platform printing device of the present invention is illustrated: Figure 4 As shown, for single-platform printing mode, either mode A or mode B is used. Figure 5 As shown, for dual-platform asynchronous printing mode, mode AB is used, and independent printing mode is selected. Figure 6 As shown, for the dual-platform synchronous printing mode, mode A is used, and platform synchronous movement is selected. The above control interface is only used to demonstrate one switchable operation mode; obviously, other forms of interfaces can also be used, all of which are within the protection scope of this invention.

[0060] According to an exemplary embodiment of the present invention, such as Figure 8 As shown, after pulse number compensation is completed using the calibration method of this invention, calibration verification can be performed as follows: First, print three parallel reference patterns, and then the stepper motor executes... One pulse, print the first reference pattern, then execute. One pulse, print the second comparison pattern, then execute again. Each pulse prints the third control pattern. This process simulates a real printable environment; only when all three control and reference patterns completely overlap is the calibration considered perfectly accurate.

[0061] According to an exemplary embodiment of the present invention: the present invention also provides a printing device that employs the aforementioned precision calibration method or the aforementioned control method.

[0062] According to an exemplary embodiment of the present invention: the present invention also provides a storage medium having a computer program stored thereon, the computer program being used to execute the control method described in any of the preceding claims.

[0063] This invention calculates the distance between adjacent nozzle groups, uses pulses to precisely step the printing platform, and employs an encoder for calibration to ensure accuracy. When printing reference patterns, a multi-line pattern is used to facilitate subsequent comparison and calibration.

[0064] This invention prints a reference pattern by calling corresponding hole groups and adjacent hole groups before and after it. Then, by comparing multiple sets of reference patterns to determine which set has the smallest difference from the reference pattern, the actual offset is calculated based on the hole group offset, and the pulse compensation value is determined. This avoids errors that may occur with manual measurement and further improves printing accuracy. By utilizing the distance between hole groups, this invention indirectly achieves precise measurement, improving measurement accuracy to the micrometer level and significantly enhancing compensation accuracy.

[0065] The precise calibration method of the present invention can be further applied to dual-platform printing equipment. Through single-platform mode, dual-platform asynchronous mode, dual-platform synchronous mode and dual-platform asynchronous independent printing mode, high-precision printing of dual-platform printing equipment can be achieved.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations and combinations of elements may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for precise calibration of a printing device, the printing device comprising a printing carriage and a printing platform, further comprising a stepper motor with an encoder for driving the printing platform to move in the X direction, the printing carriage comprising a print head, the printing carriage being movable in the Y direction, the X direction being substantially perpendicular to the Y direction; characterized in that: Includes the following steps: Obtain the nozzle height; the nozzle height meter is... ; The distance between adjacent groups of holes in the nozzle is measured as KS; The distance traveled by the platform for each received pulse is measured in PS. Reference pattern printing: At the first position of the platform, multiple hole groups are called to print multiple lines of reference pattern A on the printing medium. The multiple hole groups are respectively denoted as DK1, DK2, ..., DKn, and the printed patterns are respectively denoted as T1, T2, ..., Tn; where n>=2, and n is a natural number. For pattern group printing: the stepper motor executes X1 pulses, and an encoder is used for calibration; it is determined that executing X1 pulses corresponds to a theoretical hole group offset of SX1, where... ; Call DK1+SX1, DK2+SX1, ..., DKn+SX1 as calibration hole groups and hole groups that are offset by 1 to M holes from the calibration hole groups respectively to print reference pattern groups. The reference pattern groups are respectively denoted as D0-M...D0-1, D0, D0+1...D0+M, where M>=1 and M is a natural number. Where DK1+SX1, DK2+SX1, ..., DKn+SX1 represent the hole groups corresponding to DK1, DK2, ..., DKn offset by SX1 hole groups; By comparing the control pattern group with the reference pattern group, the optimal control pattern and the number of offset holes and offset direction corresponding to the optimal control pattern are determined. Adjust the number of pulses based on the number of offset holes and the offset direction.

2. The precise calibration method according to claim 1, characterized in that: Based on the number of offset holes and the offset direction, the pulse number adjustment includes: calculating the number of pulses (Lhpulse) required for the stepper motor to move the printing platform one printhead height; and calculating the number of pulses that need to be adjusted to move the printing platform one printhead height.

3. The precise calibration method according to claim 2, characterized in that: The stepper motor executing X1 pulses includes: the stepper motor executing multiple pulses, the sum of which is X1.

4. The precise calibration method according to claim 3, characterized in that: The stepper motor executing multiple pulses, where X1=Lhpulse, includes: the stepper motor first executing... X1 pulses, then execute X1 pulses, then execute again. X1 pulses.

5. The precise calibration method according to claim 1, characterized in that: The printing platform includes platform A and platform B; the printing device can switch between different printing modes, including: single-platform mode, dual-platform asynchronous mode and dual-platform synchronous mode.

6. The precise calibration method according to claim 5, characterized in that: The single-platform mode specifically means that either platform A or platform B works independently.

7. The precise calibration method according to claim 5, characterized in that: Dual-platform asynchronous mode: Platform A and Platform B work independently, starting tasks through their respective signal triggers to achieve basic parallel operations.

8. The precise calibration method according to claim 5, characterized in that: Dual-platform synchronization mode: The motion of either platform A or platform B is fully synchronized.

9. A printing device, characterized in that: The precise calibration method according to any one of claims 1-8 is adopted.

10. A storage medium, characterized in that: It contains a computer program for performing the precise calibration method according to any one of claims 1-8.

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