Jet printing process control method of digital printing machine

Abstract

The invention relates to the technical field of digital printing, and discloses a digital printing machine jet printing process control method, which comprises the following steps of: controlling a cloth pressing roller to flatly and tightly attach a conveying belt to convey cloth in combination with obtained conveying parameters of the cloth to be printed; performing height positioning on the printing nozzle according to a height positioning method, wherein the height positioning method is that the printing nozzle is positioned by returning to the starting point each time; calculating the motion logic required to be executed by the printing nozzle on each axis according to the printing draft data; the printing nozzle is moved to a designated position, the working position of the printing nozzle is obtained in real time, and draft printing is executed; after the printing nozzle completes part of printing, the conveying belt pulls the cloth to a designated position according to a preset stroke to continue printing; and in response to completion of draft printing, controlling the printing nozzle to return to the standby position. The cloth pressing roller is controlled by combining conveying parameters to convey the cloth in a manner of flatly clinging to the conveying belt, so that the cloth is not easy to be too tight or too loose; the printing nozzle is positioned by combining a height positioning method without adding a feedback device, so that the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of printing control, and in particular to a printing process control method of a digital printing machine. Background Art

[0002] Digital printing is a common printing technology. Among them, the digital direct printing machine prints the pattern directly on the fabric, and then performs processes such as steaming and fixing the color, washing and shaping.

[0003] Specifically, digital printing machines can print a wide range of materials, including natural fibers such as cotton, linen, silk, wool, and various chemical fibers. They have good printing effects, realistic colors, and a relatively simple production process, but they have high requirements for machines and inks. In addition, the requirements for digital printing machine control are also high. The existing technology usually has the following technical problems:

[0004] If the supply of fabric is not reasonable, it may cause the fabric to be too tight or too loose when being conveyed by the cloth pressing roller, thus affecting the printing accuracy. When the print head is highly positioned, closed-loop control is generally used in automation, but the closed-loop requires an additional feedback device and a server with a second feedback input, which is more expensive.

[0005] Therefore, it is necessary to provide a method for controlling the printing process of a digital printing machine to solve or improve at least one of the above technical problems.

[0006] Based on this, it is necessary to provide a method for controlling the printing process of a digital printing machine in response to the existing problems, aiming to solve or improve at least one of the above technical problems.

[0007] The present application provides a method for controlling a printing process of a digital printing machine, which comprises:

[0008] Combined with the conveying parameters of the cloth to be printed, the cloth pressing roller is controlled to convey the cloth flatly and closely to the transmission belt, wherein the conveying parameters include the width and tension of the cloth;

[0009] Performing height positioning of the print head according to a height positioning method, wherein the print head is positioned by returning to a starting point each time;

[0010] Calculate the motion logic that the print head needs to execute on each axis based on the printing artwork data;

[0011] Move the print head to the specified position, obtain the working position of the print head in real time, and execute artwork printing;

[0012] When the print head has finished printing a part of the area, the transmission belt pulls the fabric to the designated position according to the preset stroke to continue printing the artwork;

[0013] In response to the completion of printing of the artwork, the print head is controlled to return to the standby position.

[0014] In some embodiments, the step of controlling the cloth pressing roller to convey the cloth flatly against the transmission belt in combination with the conveying parameters of the cloth to be printed comprises:

[0015] The PLC obtains the width w of the fabric, as well as the printing speed V, the printing start position S1, the movement start position S2, and the Y-axis travel S3 of the print head;

[0016] According to a preset calculation formula, the cloth pressing roller speed V1 is obtained, wherein the cloth pressing roller speed V1=(S3*V) / W-0.2*S1+0.2*S2)*correction value;

[0017] The cloth pressing roller is controlled at the cloth pressing roller speed V1 to convey the cloth flatly and closely to the transmission belt.

[0018] In some embodiments, the step of calculating the motion logic that the print head needs to execute on each axis according to the printing artwork data includes:

[0019] The PLC obtains the width w of the cloth corresponding to the printed artwork, the printing speed V of the print head, the printing start position S1, the movement start position S2, the Y-axis travel S3, and the Y-axis speed V2;

[0020] The X-axis motion curve data processing, the Y-axis motion curve data processing and the R-axis motion curve data processing are performed respectively.

[0021] In some embodiments, the X-axis motion curve data processing includes:

[0022] According to the acceleration and deceleration algorithm and the jerk algorithm, the parameters of the X-axis motion curve are calculated and sent to the X-axis motion servo corresponding to the print head for absolute positioning motion;

[0023] Among them, the acceleration and deceleration algorithm is: acceleration and deceleration = V2 / (2S1-S2); the acceleration algorithm is: jerk = acceleration and deceleration / (acceleration time x target smoothness / 2).

[0024] In some embodiments, the Y-axis motion curve data processing includes:

[0025] According to the Y-axis stroke S3 / the number of PASSes in the current printing mode, the actual movement stroke of the Y-axis is calculated and sent to the Y-axis motion servo corresponding to the print head for relative positioning movement.

[0026] In some embodiments, the R-axis motion curve data processing includes:

[0027] According to the actual movement stroke of the Y axis / 2, the actual movement stroke of the R axis is calculated and sent to the R axis motion servo corresponding to the print head for absolute positioning movement.

[0028] In some implementations, the step of moving the print head to a specified position, acquiring the working position of the print head in real time, and performing artwork printing includes:

[0029] Through the bus operation mode, the dual parallel linear motors are controlled to move the spray carriage equipped with the print head to the specified position;

[0030] When the inkjet machine is moving, the print head synchronously reads the high-precision magnetic plate to print the artwork;

[0031] Among them, the magnetic reading head is installed on the inkjet carriage and moves with the inkjet carriage. The magnetic reading head is used to read the magnetic scale on the beam and transmit the current position signal of the inkjet carriage to the control board of the print head in the form of a differential signal. The control board controls the print head to print the artwork according to the current position signal.

[0032] In some embodiments, after the print head completes printing of a portion of the area, the transmission belt pulls the cloth to a designated position according to a preset stroke to continue printing the artwork, including:

[0033] The transmission belt is positioned by the Y-axis motion servo control;

[0034] The preset stroke is calculated by dividing the number of print heads in the Y-axis direction by 106 mm and the number of passes in the printing mode;

[0035] According to the preset stroke, the fabric is pulled to a specified position to continue printing the artwork.

[0036] In some implementations, in response to the completion of printing of the artwork, controlling the print head to return to the standby position may also include:

[0037] If the print head status is determined to be good during printing, it is further determined whether the print head protection is triggered. If the print head protection is triggered, the spraying vehicle is stopped immediately, and after a preset dwell time, the print head is automatically raised to a safe height, and then moved to a designated position to end printing;

[0038] If the print head status is judged to be bad during printing, printing is paused and the inkjet carriage is moved to the cleaning position; according to the preset cleaning parameters, the print head is pressed and scraped to restore the print head status; then, it is further determined whether the nozzle protection is triggered. If the nozzle protection is triggered, the inkjet carriage is stopped immediately, and after the preset dwell time, the print head is automatically raised to a safe height, and then moved to the specified position to end printing.

[0039] In some embodiments, the determination of the print head status during the printing process includes determining whether the printed artwork is blurry, whether there is a lack of printing, or whether there is ink dripping. When the print head status does not show one or more of blurry, lack of printing, or ink dripping, the print head status during the printing process is determined to be good; otherwise, the print head status during the printing process is determined to be bad; and / or,

[0040] The judgment of triggering the nozzle protection includes triggering the nozzle protection when it is judged that the cloth is wrinkled or a foreign object has fallen onto the printing platform; wherein, three high-precision laser sensors are installed at the front, middle and rear of the printing platform of the digital printing machine to detect the cloth and other foreign objects on the printing platform; the spray car has a spray car anti-collision device in both the X-axis and Y-axis movement directions to trigger the nozzle protection.

[0041] Beneficial effects of the present invention:

[0042] The digital printing machine printing process control method of the present invention controls the cloth pressing roller to convey the cloth flatly against the transmission belt by combining the conveying parameters of the cloth to be printed; then, the print nozzle is highly positioned according to the height positioning method; then, the motion logic that the print nozzle needs to execute on each axis is solved according to the printing artwork data; then, the print nozzle is moved to the specified position, the working position of the print nozzle is obtained in real time, and the artwork is printed; and when the print nozzle completes a part of the printing, the transmission belt pulls the cloth to the specified position according to the preset stroke to continue printing; finally, in response to the completion of the artwork printing, the print nozzle is controlled to return to the standby position. It controls the cloth pressing roller by combining the conveying parameters, and then conveys the cloth flatly against the transmission belt, so that the cloth is not easy to be too tight or too loose, which is conducive to improving the printing quality and printing accuracy; in addition, it performs height positioning on the print nozzle according to the height positioning method, and only needs to return to the starting point for positioning each time to achieve the control of the height positioning accuracy. Compared with the existing height positioning method of the digital printing machine, the present application does not need to add a closed-loop control supporting device such as a feedback device, so the overall cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic flow chart of a method for controlling a printing process of a digital printing machine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a feature "above" or "below" a second feature may be in direct contact with the second feature, or in indirect contact with the second feature through an intermediate medium. Moreover, a feature "above", "above" and "above" a second feature may mean that the feature is directly above or obliquely above the second feature, or simply means that the feature is higher in level than the second feature. A feature "below", "below" and "below" a second feature may mean that the feature is directly below or obliquely below the second feature, or simply means that the feature is lower in level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0051] The digital printing machine with a spray carriage is mainly composed of a print head, ink cartridge, feeding device, control system, mechanical support, cleaning mechanism and other parts. The print head is the core component of the digital printing machine and determines the printing accuracy and speed. The ink cartridge is used to store ink, and its capacity determines the size of the pattern that can be printed. The feeding device is responsible for feeding the textile into the printing area. There are many feeding methods to choose from, such as feeding with a cloth pressing roller and feeding with a transmission belt to convey the cloth. The control system is a software system that controls the entire printing process, including settings such as printing speed and ink usage. The mechanical support is the framework that supports the entire digital printing machine, which is required to be stable and reliable. In addition, the digital printing machine with a spray carriage also involves some specific structural designs, such as a spray carriage, which includes a back plate, a shell, etc., on which a print head is installed.

[0052] However, the prior art usually has the following technical problems: the supply of cloth is not reasonable enough, which may easily cause the cloth to be too tight or too loose when being conveyed by the cloth pressing roller, thereby affecting the printing accuracy; when the print head is highly positioned, closed-loop control is generally used in automation, but the closed-loop requires an additional feedback device and a server with a second feedback input, which is more expensive.

[0053] refer to Figure 1 The embodiment of the present application provides a method for controlling a printing process of a digital printing machine, which comprises:

[0054] Step 100, based on the obtained conveying parameters of the cloth to be printed, control the cloth pressing roller to convey the cloth flatly and closely to the transmission belt, and the conveying parameters include the width and tension of the cloth;

[0055] Step 200, performing height positioning of the print head according to a height positioning method, wherein the print head is positioned by returning to the starting point each time;

[0056] Step 300, calculating the motion logic that the print head needs to execute on each axis according to the printing artwork data;

[0057] Step 400, moving the print head to a specified position, acquiring the working position of the print head in real time, and executing artwork printing;

[0058] Step 500: After the print head has completed printing of a part of the area, the transmission belt pulls the cloth to a designated position according to a preset stroke to continue printing the artwork;

[0059] Step 700: In response to the completion of printing of the artwork, the print head is controlled to return to the standby position.

[0060] The above-mentioned digital printing machine printing process control method controls the cloth pressing roller by combining the conveying parameters, and then conveys the cloth flatly and closely to the transmission belt, so that the cloth is not easy to be too tight or too loose, which is beneficial to improve the printing quality and printing accuracy; in addition, it performs height positioning of the printing nozzle according to the height positioning method, and each time it only needs to return to the starting point for positioning to achieve the control of the height positioning accuracy. Compared with the existing height positioning method of the digital printing machine, the present application does not need to add supporting devices for closed-loop control such as feedback devices, so the overall cost is low.

[0061] Explanatory note, in step 500, after the print head completes printing of a portion of the area, the transmission belt pulls the fabric to a designated position according to a preset stroke to continue printing the artwork, which means continuing to pull the fabric that needs to be printed subsequently to a designated position according to a preset stroke to continue printing the artwork.

[0062] Further, in some embodiments, step 100, combining the obtained conveying parameters of the cloth to be printed, controlling the cloth pressing roller to convey the cloth flatly against the transmission belt, comprises the following steps:

[0063] Step 110, PLC obtains the width w of the cloth, as well as the printing speed V, the printing start position S1, the movement start position S2, and the Y-axis travel S3 of the print head;

[0064] Step 120, according to a preset calculation formula, obtain the cloth pressing roller speed V1, wherein the cloth pressing roller speed V1=(S3*V) / W-0.2*S1+0.2*S2)*correction value;

[0065] Step 130, control the cloth pressing roller at a cloth pressing roller speed V1 to convey the cloth flatly and closely to the transmission belt.

[0066] Generally speaking, if the speed of the cloth pressing roller is too fast, the cloth will be too loose, and the cloth will wrinkle when it reaches the transmission belt or the cloth cannot be stuck to the transmission belt, thus affecting the printing accuracy; if the speed of the cloth pressing roller is too slow, the cloth will be too tight, which will easily cause the cloth to deform, thus affecting the printing accuracy. 3，The preset calculation formula is combined to realize the accurate calculation of the cloth pressing roller speed V1 of the cloth pressing roller, which is beneficial to convey the cloth flatly and closely to the transmission belt, reducing or even avoiding the cloth being too tight or too loose, thereby helping to improve the printing accuracy and the printing quality.

[0067] In some implementations, step 300, calculating the motion logic that the print head needs to execute on each axis according to the printing artwork data, includes the following steps:

[0068] Step 310, PLC obtains the width w of the cloth corresponding to the printed artwork, the printing speed V of the print head, the printing start position S1, the movement start position S2, the Y-axis stroke S3, and the Y-axis speed V2;

[0069] Step 320 , respectively perform X-axis motion curve data processing, Y-axis motion curve data processing, and R-axis motion curve data processing.

[0070] By solving the X-axis motion curve data processing, the Y-axis motion curve data processing and the R-axis motion curve data processing, the movement of the print head along the X-axis or Y-axis on the horizontal plane and the rotation around its own axis can be accurately controlled according to the processing results, thereby accurately controlling the printing process.

[0071] Explanatory, the X-axis is parallel to the width direction of the cloth, the Y-axis is parallel to the length direction of the cloth, and the R-axis mainly refers to the axis of rotation of the print head around its own axis. As for the specific process of X-axis motion curve data processing, Y-axis motion curve data processing and R-axis motion curve data processing.

[0072] Furthermore, in some embodiments, the X-axis motion curve data processing in step 320 includes:

[0073] Step 321, calculate the parameters of the motion curve of the X-axis according to the acceleration / deceleration algorithm and the jerk algorithm, and send them to the X-axis motion servo corresponding to the print head to perform absolute value positioning motion;

[0074] Among them, the acceleration and deceleration algorithm is: acceleration and deceleration = V2 / (2S1-S2); the acceleration algorithm is: jerk = acceleration and deceleration / (acceleration time x target smoothness / 2).

[0075] Furthermore, in some embodiments, the Y-axis motion curve data processing in step 320 includes:

[0076] Step 322, calculate the actual movement stroke of the Y-axis according to the Y-axis stroke S3 / the number of PASSes in the current printing mode, and send it to the Y-axis motion servo corresponding to the print head for relative positioning movement.

[0077] Explanatory note, scanning printers in the industry have 1PASS, 2PASS and multi-PASS printing modes, that is, N PASS printing is when N times of printing are required to complete printing on a printing area.

[0078] Furthermore, in some embodiments, the R-axis motion curve data processing in step 320 includes:

[0079] Step 323, calculate the actual movement stroke of the R axis according to the actual movement stroke of the Y axis / 2, and send it to the R axis motion servo corresponding to the print head to perform absolute positioning movement.

[0080] In some implementations, step 400, moving the print head to a specified position, acquiring the working position of the print head in real time, and performing artwork printing, includes the following steps:

[0081] Step 410, controlling the dual parallel linear motors to move the spray carriage equipped with the print head to a specified position through the bus operation mode;

[0082] Step 420: When the inkjet machine is moving, the print head synchronously reads the high-precision magnetic disk to print the artwork;

[0083] Among them, the magnetic reading head is installed on the inkjet carriage and moves with the inkjet carriage. The magnetic reading head is used to read the magnetic scale on the beam and transmit the current position signal of the inkjet carriage to the control board of the print head in the form of a differential signal. The control board controls the print head to print the artwork according to the current position signal.

[0084] In the above implementation, through the dual-drive synchronous mode of the dual parallel linear motors, the speeds of the four linear motors are synchronized and run at a speed that does not differ by ±3 mm / s.

[0085] In some embodiments, step 500, when the print head completes printing of a part of the area, the transmission belt pulls the cloth to a designated position according to a preset stroke to continue printing the artwork, including the following steps:

[0086] Step 510, the transmission belt is positioned by controlling the Y-axis motion servo;

[0087] Step 520, calculate the preset stroke according to the number of print heads in the Y-axis direction*106mm and divide it by the number of PASSes in the printing mode;

[0088] Step 530: Pull the cloth to a designated position according to a preset stroke to continue printing the artwork.

[0089] The above implementation method accurately calculates the preset stroke, and then continuously completes the pulling of the cloth by the preset stroke through the above steps, thereby completing the printing work step by step.

[0090] In some implementations, step 700, in response to the completion of printing of the artwork, controlling the print head to return to the standby position, may also include:

[0091] Step 600, determine the status of the print head during printing, and trigger the print head protection determination according to the determination result, or pause printing and move the carriage to the cleaning position for cleaning and return to determine the triggering of the print head protection determination;

[0092] Specifically, if it is determined that the print head is in good condition during the printing process, it is further determined whether the nozzle protection is triggered. If the nozzle protection is triggered, the spray carriage is stopped immediately, and after a preset dwell time, the print head is automatically raised to a safe height, and then moved to a designated position to end printing; if it is determined that the print head is in poor condition during the printing process, printing is paused and the spray carriage is moved to a cleaning position; according to preset cleaning parameters, the print head is subjected to ink pressing and scraping to restore the nozzle condition; then, it is further determined whether the nozzle protection is triggered. If the nozzle protection is triggered, the spray carriage is stopped immediately, and after a preset dwell time, the print head is automatically raised to a safe height, and then moved to a designated position to end printing.

[0093] The above-mentioned implementation method can realize the monitoring of the print head status during the printing process and whether the print head protection is triggered, and can implement the safety judgment and control of the working process, thereby reducing or avoiding problems such as damage to the print head or excessive and unqualified printing.

[0094] Furthermore, in some embodiments, step 600, judging the status of the print head during printing, further includes judging whether the printed artwork is blurry, whether there is a lack of printing, and whether there is ink dripping. When the status of the print head does not show one or more of blurry, lack of printing, and ink dripping, the status of the print head during printing is judged to be good, otherwise, the status of the print head during printing is judged to be bad. The above judgment method can further feedback common problems of bad status of print heads.

[0095] In addition, further, in some embodiments, the determination of triggering the nozzle protection in step 600 includes triggering the nozzle protection when it is determined that the cloth is wrinkled or a foreign object has fallen onto the printing platform; wherein, three high-precision laser sensors are installed at the front, middle and rear of the printing platform of the digital printing machine, and the laser sensors are used to detect the cloth and other foreign objects on the printing platform; the spray car has a spray car anti-collision device in both the X-axis and Y-axis movement directions to trigger the nozzle protection. The triggering control of the nozzle protection is further realized through the above embodiments.

[0096] In addition, in some embodiments, before the print head performs printing, for example, before step 100 or before step 400, the digital printing machine printing process control method may further include automatic flashing treatment before printing. The automatic flashing treatment before printing can prevent the nozzle ink of the print head from drying out and failing to print normally.

[0097] Finally, it should be noted that the various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A method for controlling the printing process of a digital printing machine, characterized in that: include: Combined with the conveying parameters of the cloth to be printed, the cloth pressing roller is controlled to convey the cloth flatly and closely to the transmission belt, wherein the conveying parameters include the width and tension of the cloth; Performing height positioning of the print head according to a height positioning method, wherein the print head is positioned by returning to a starting point each time; Calculate the motion logic that the print head needs to execute on each axis based on the printing artwork data; Move the print head to the specified position, obtain the working position of the print head in real time, and execute artwork printing; When the print head has finished printing a part of the area, the transmission belt pulls the fabric to the designated position according to the preset stroke to continue printing the artwork; In response to the completion of printing of the artwork, the print head is controlled to return to the standby position.

2. The method for controlling the printing process of a digital printing machine according to claim 1, characterized in that: The method combines the conveying parameters of the cloth to be printed to control the cloth pressing roller to convey the cloth flatly and closely to the transmission belt, including: The PLC obtains the width w of the fabric, as well as the printing speed V, the printing start position S1, the movement start position S2, and the Y-axis travel S3 of the print head; According to a preset calculation formula, the cloth pressing roller speed V1 is obtained, wherein the cloth pressing roller speed V1=(S3*V) / W-0.2*S1+0.2*S2)*correction value; The cloth pressing roller is controlled at the cloth pressing roller speed V1 to convey the cloth flatly and closely to the transmission belt.

3. The method for controlling the printing process of a digital printing machine according to claim 1, characterized in that: The method of calculating the motion logic that the print head needs to execute on each axis according to the printing artwork data includes: The PLC obtains the width w of the cloth corresponding to the printed artwork, the printing speed V of the print head, the printing start position S1, the movement start position S2, the Y-axis travel S3, and the Y-axis speed V2; The X-axis motion curve data processing, the Y-axis motion curve data processing and the R-axis motion curve data processing are performed respectively.

4. The method for controlling the printing process of a digital printing machine according to claim 3, characterized in that: The X-axis motion curve data processing includes: According to the acceleration and deceleration algorithm and the jerk algorithm, the parameters of the X-axis motion curve are calculated and sent to the X-axis motion servo corresponding to the print head for absolute positioning motion; Among them, the acceleration and deceleration algorithm is: acceleration and deceleration = V2 / (2S1-S2); the acceleration algorithm is: jerk = acceleration and deceleration / (acceleration time x target smoothness / 2).

5. The method for controlling the printing process of a digital printing machine according to claim 3, characterized in that: The Y-axis motion curve data processing includes: According to the Y-axis stroke S3 / the number of PASSes in the current printing mode, the actual movement stroke of the Y-axis is calculated and sent to the Y-axis motion servo corresponding to the print head for relative positioning movement.

6. The method for controlling the printing process of a digital printing machine according to claim 5, characterized in that: The R-axis motion curve data processing includes: According to the actual movement stroke of the Y axis / 2, the actual movement stroke of the R axis is calculated and sent to the R axis motion servo corresponding to the print head for absolute positioning movement.

7. The method for controlling the printing process of a digital printing machine according to claim 1, characterized in that: The step of moving the print head to a specified position, acquiring the working position of the print head in real time, and executing artwork printing includes: Through the bus operation mode, the dual parallel linear motors are controlled to move the spray carriage equipped with the print head to the specified position; When the inkjet machine is moving, the print head synchronously reads the high-precision magnetic plate to print the artwork; Among them, the magnetic reading head is installed on the inkjet carriage and moves with the inkjet carriage. The magnetic reading head is used to read the magnetic scale on the beam and transmit the current position signal of the inkjet carriage to the control board of the print head in the form of a differential signal. The control board controls the print head to print the artwork according to the current position signal.

8. The method for controlling the printing process of a digital printing machine according to claim 1, characterized in that: When the print head completes printing of a part of the area, the transmission belt pulls the cloth to a designated position according to a preset stroke to continue printing the artwork, including: The transmission belt is positioned by the Y-axis motion servo control; The preset stroke is calculated by dividing the number of print heads in the Y-axis direction by 106 mm and the number of passes in the printing mode; According to the preset stroke, the fabric is pulled to a specified position to continue printing the artwork.

9. The method for controlling the printing process of a digital printing machine according to claim 7, characterized in that: In response to the completion of printing of the artwork, the printing head is controlled to return to the standby position, and the method also includes: If the print head status is determined to be good during printing, it is further determined whether the print head protection is triggered. If the print head protection is triggered, the spraying vehicle is stopped immediately, and after a preset dwell time, the print head is automatically raised to a safe height, and then moved to a designated position to end printing; If the print head status is judged to be bad during printing, printing is paused and the inkjet carriage is moved to the cleaning position; according to the preset cleaning parameters, the print head is pressed and scraped to restore the print head status; then, it is further determined whether the nozzle protection is triggered. If the nozzle protection is triggered, the inkjet carriage is stopped immediately, and after the preset dwell time, the print head is automatically raised to a safe height, and then moved to the specified position to end printing.

10. The method for controlling the printing process of a digital printing machine according to claim 9, characterized in that: The determination of the print head status during the printing process includes determining whether the printed artwork is blurry, whether there is a lack of printing, and whether there is ink dripping. When the print head status does not show one or more of blurry, lack of printing, and ink dripping, the print head status during the printing process is determined to be good; otherwise, the print head status during the printing process is determined to be bad; and / or, The judgment of triggering the nozzle protection includes triggering the nozzle protection when it is judged that the cloth is wrinkled or a foreign object has fallen onto the printing platform; wherein, three high-precision laser sensors are installed at the front, middle and rear of the printing platform of the digital printing machine to detect the cloth and other foreign objects on the printing platform; the spray car has a spray car anti-collision device in both the X-axis and Y-axis movement directions to trigger the nozzle protection.

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