Printing trolley variable-speed motion ink-jet printing method, device and equipment and storage medium

Abstract

The invention discloses a variable-speed motion ink-jet printing method, device and equipment for a printing trolley and a storage medium, and relates to the technical field of ink-jet printing. The method comprises the steps that the flying distance, namely the second distance, of ink droplets when the printing trolley conducts printing at the constant speed in the X-axis direction is obtained, and the flying distance, namely the first distance, of the ink droplets when the printing trolley jets the ink droplets from the initial printing position is obtained; and according to the first distance and the second distance, an ink-jet grating adjustment value is obtained, and the printing trolley is correspondingly driven to conduct ink-jet printing in the variable-speed movement process in the X-axis direction. According to the method, the jet opportunity of ink droplets in the variable-speed motion printing process is adjusted through the ink jet grating adjustment value, so that the intervals between ink droplet dripping points or pixel points in variable-speed printing are uniform and consistent with those in constant-speed printing, the image printing effect is ensured, printing is carried out in the variable-speed motion stage, the printing efficiency can be remarkably improved, and the printing cost is reduced. The printing capacity and the material utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printing, and in particular to a method, device, equipment and storage medium for inkjet printing with variable speed motion of a printing carriage. Background Art

[0002] In a reciprocating scanning inkjet printing system, the printing of an image requires multiple reciprocating movements of the printing carriage, in which the movement of the printing carriage is divided into three stages: acceleration, constant speed, and deceleration. Figure 1 As shown, the reciprocating scanning inkjet printing device controls the printing carriage 1 to reciprocate along the beam 2 and print ink through a motor. The direction of movement of the printing carriage is the X-axis direction (or printing direction), and the direction of movement of the printing carriage 1 relative to the printing medium 3 is the Y-axis direction (or stepping direction). It is assumed that the printing carriage moves from left to right along the X-axis direction. During this process, the printing carriage accelerates from rest, moves at a constant speed after reaching the printing area (inkjet printing images during the constant speed movement), and starts to decelerate until it stops after leaving the printing area 4. After the printing carriage completes 1 Pass printing (or completes a scan), it moves a certain distance along the Y-axis direction relative to the printing medium, and then starts to print the next 1 Pass, that is, from right to left, from a rest state to an accelerated motion until the printing area starts to move at a constant speed, and decelerates until it stops after leaving the printing area 4, and this cycle is repeated until the printing task is completed.

[0003] The printing carriage needs to scan and print back and forth multiple times along the X-axis direction, and it takes a long time to complete the entire printing task. During the process of the printing carriage scanning and printing back and forth multiple times along the X-axis direction, inkjet printing is usually not possible during the variable speed movement stage (including acceleration and deceleration). The main reason is that the speed change makes it difficult to control the flight trajectory and landing point of the ink droplets. The speed change may cause uneven ink drop spacing, affecting the printing accuracy and the superposition effect of multi-pass printing, thereby affecting the printing quality. In addition, since the printing carriage cannot perform inkjet printing during the variable speed movement stage (including acceleration and deceleration), the printing efficiency of the printing carriage during the movement of the X-axis direction is further reduced, thereby affecting the printing capacity. Therefore, it is particularly important to use the printing carriage to perform inkjet printing during the variable speed movement stage while ensuring the overall printing effect, thereby improving the printing efficiency of the printing carriage. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a method, device, equipment and storage medium for inkjet printing with a print carriage having a variable speed motion, so as to solve the problem in the prior art that the print carriage cannot perform inkjet printing during the variable speed motion stage, which affects printing efficiency and production capacity.

[0005] In a first aspect, an embodiment of the present invention provides a method for inkjet printing with a printing carriage at a variable speed, the method comprising: Obtain the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, where the X-axis direction is the printing direction; Obtaining the flying distance of ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, recorded as a second distance; According to the first speed and the second distance, the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects the ink droplets from the starting printing position is obtained, and recorded as the first distance; Acquire an inkjet grating adjustment value according to the first distance and the second distance; The printing carriage is driven to perform inkjet printing during variable speed movement along the X-axis direction according to the inkjet grating adjustment value.

[0006] Preferably, the step of obtaining the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, includes: Obtain the movement speed of the printing carriage during inkjet printing at a uniform speed along the X-axis direction, recorded as the second speed; Obtaining a corresponding movement distance when the printing carriage accelerates from rest to the first speed, recorded as the accelerated movement distance; Acquire the acceleration of the printing carriage when it performs variable speed motion according to the accelerated motion distance and the second speed; Determine the starting printing position of the printing carriage in the phase of variable speed movement along the X-axis; A first speed of the printing carriage corresponding to the starting printing position is acquired according to the acceleration.

[0007] Preferably, the step of obtaining the flying distance of ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, recorded as the second distance, includes: Obtaining a bidirectional calibration value when the printing carriage performs bidirectional calibration printing along the X-axis direction; The second distance is acquired according to the bidirectional calibration value.

[0008] Preferably, the acquiring, according to the first speed and the second distance, a flying distance of the ink droplets along the X-axis direction when the printing carriage ejects the ink droplets from the starting printing position, recorded as the first distance, comprises: Obtaining the vertical movement distance and vertical speed corresponding to the ink droplets ejected when the printing carriage moves at a uniform speed in the X-axis direction and falling along the Z-axis direction; wherein the Z-axis direction is perpendicular to the X-axis direction and the Y-axis direction, and the Y-axis direction is the direction in which the printing carriage steps relative to the printing medium; Obtaining a second ratio of the vertical movement distance to the vertical speed according to a first ratio of the second distance to the second speed; The flying distance of the ink droplet along the X-axis direction when the ink droplet is ejected from the starting printing position is obtained according to the first speed and the second ratio, which is the first distance.

[0009] Preferably, acquiring the inkjet grating adjustment value according to the first distance and the second distance comprises: Acquire a reference ink drop landing point deviation value according to the first distance and the second distance; Obtaining the number of variable speed printing pixels according to the printing width and printing accuracy in the X-axis direction during the variable speed movement stage; The inkjet raster adjustment value corresponding to each variable speed printing pixel is obtained according to the reference ink drop landing point deviation value and the variable speed printing pixel quantity.

[0010] Preferably, obtaining a reference ink drop landing point deviation value according to the first distance and the second distance comprises: The reference ink drop landing point deviation value is obtained according to the following formula: ; in is the reference ink drop landing point deviation value, L is the second distance, and m0 is the first distance.

[0011] Preferably, the step of obtaining the inkjet raster adjustment value corresponding to each variable speed printing pixel according to the reference ink drop landing point deviation value and the variable speed printing pixel number comprises: When the printing carriage is in accelerated motion, , n = 1,2,…,h; When the printing carriage is in deceleration motion, , n = 1,2,…,h.

[0012] in, The inkjet raster adjustment value for the nth variable speed printing pixel. is the reference ink drop landing point deviation value, and h is the number of variable speed printing pixels.

[0013] Preferably, In a second aspect, an embodiment of the present invention provides a variable speed motion inkjet printing device for a printing carriage, the device comprising: A first speed acquisition module is used to acquire the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; A second distance acquisition module is used to acquire the flying distance of the ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, which is recorded as the second distance; A first distance acquisition module, used for acquiring, according to the first speed and the second distance, a flying distance of ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position, recorded as a first distance; A grating adjustment value acquisition module, used for acquiring an inkjet grating adjustment value according to the first distance and the second distance; The printing module is used to drive the printing carriage to perform inkjet printing during the variable speed movement along the X-axis direction according to the inkjet grating adjustment value.

[0014] In a third aspect, an embodiment of the present invention provides a variable speed motion inkjet printing device for a printing carriage, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, and when the computer program instructions are executed by the processor, the method of the first aspect in the above embodiment is implemented.

[0015] In a fourth aspect, an embodiment of the present invention provides a storage medium having computer program instructions stored thereon, which implements the method of the first aspect in the above-mentioned embodiment when the computer program instructions are executed by a processor.

[0016] In summary, the beneficial effects of the present invention are as follows: The embodiment of the present invention provides a method, device, equipment and storage medium for inkjet printing with variable speed motion of a printing carriage. The method comprises the following steps: obtaining the motion speed corresponding to the starting printing position during the variable speed motion of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; obtaining the flying distance of the ink droplets when the printing carriage is printing at a uniform speed along the X-axis direction, which is recorded as the second distance; obtaining the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position according to the first speed and the second distance, which is recorded as the first distance; obtaining the inkjet grating adjustment value according to the first distance and the second distance; and driving the printing carriage to perform inkjet printing during the variable speed motion along the X-axis direction according to the inkjet grating adjustment value. The method adjusts the ejection timing of the ink droplets during the variable speed motion printing process by the inkjet grating adjustment value, so that the intervals between the ink droplet landing points or pixel points during the variable speed printing are uniform and consistent with those during the uniform speed printing, thereby ensuring the image printing effect. Since printing is performed during the variable speed motion stage, the printing efficiency in each PASS printing process can be significantly improved, the printing capacity can be improved, and the utilization rate of the printing medium can also be improved, which is conducive to reducing material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0018] Figure 1 It is a structural schematic diagram of reciprocating scanning printing in the background technology.

[0019] Figure 2 It is a flow chart of the inkjet printing method with variable speed motion of the printing carriage according to an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the motion curve of the printing carriage in an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of the motion trajectory of ink droplets when the printing carriage prints at a uniform speed in an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the motion trajectory of ink droplets when the printing carriage accelerates, moves at a constant speed and decelerates in an embodiment of the present invention.

[0023] Figure 6 It is a schematic structural diagram of a variable speed motion inkjet printing device of a printing carriage according to an embodiment of the present invention.

[0024] Figure 7 It is a schematic structural diagram of an inkjet printing device with a print carriage having variable speed motion according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0027] Embodiment 1

[0028] The embodiment of the present invention provides a method for inkjet printing with a printing carriage in variable speed motion, which is applicable to a reciprocating scanning printing system. The reciprocating scanning printing system drives the printing carriage to reciprocate multiple times by applying a driving current to the printing carriage to complete image printing. The motion process of the printing carriage includes three stages: acceleration motion, uniform motion and deceleration motion. The acceleration motion and deceleration motion stages are collectively referred to as variable speed motion stages. In the existing reciprocating scanning printing system, the printing carriage will not perform inkjet printing in the variable speed motion stage to avoid affecting the image printing effect. Because when the printing carriage is in variable speed motion, the flying speed of the ink droplets ejected by its nozzle at different times along the X-axis direction is different, and the flying distance from the nozzle to the droplet falling on the printing medium is also different. The density between the ink droplet landing points is inconsistent or uneven, which affects the final image printing quality. In the embodiment of the present invention, the motion characteristics of the printing carriage in the variable speed motion stage are used to adjust the inkjet raster value to drive the printing carriage to perform inkjet printing, thereby improving the printing efficiency of the printing carriage while ensuring the overall printing effect.

[0029] See also Figure 2 The embodiment of the present invention provides a method for inkjet printing with a printing carriage having a variable speed motion, the method comprising the following steps: S1: Obtain the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, where the X-axis direction is the printing direction; S2: Obtain the flying distance of the ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, and record it as the second distance; S3: acquiring a flying distance of ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position according to the first speed and the second distance, and recording the flying distance as a first distance; S4: acquiring an inkjet grating adjustment value according to the first distance and the second distance; S5: According to the inkjet grating adjustment value, the printing carriage is driven to perform inkjet printing during the variable speed movement along the X-axis direction.

[0030] Specifically, the motion curve of the printing carriage along the X-axis direction is as follows: Figure 3 As shown in the figure, the printing carriage starts to move at a uniform acceleration from a rest speed of 0. When the speed reaches V max At this time, the uniform speed movement begins, and after a period of uniform speed movement, the uniform deceleration movement stage is entered until the speed reaches 0. In the embodiment of the present invention, the inkjet printing is started during the speed change movement stage of the printing carriage, and the starting printing position during the speed change movement stage can be determined according to the actual situation. For example, Figure 3As shown, the distance between the starting printing position and the stationary point of the printing carriage (the position where the printing carriage speed is 0) is S0, and the corresponding movement speed of the printing carriage at this time is recorded as the first speed V0. The flight distance of the ink droplets when the printing carriage is printing at a uniform speed along the X-axis direction is obtained, which is recorded as the second distance. In one embodiment, the second distance here can be calculated by controlling the printing carriage to perform a bidirectional calibration printing when printing at a uniform speed to obtain a bidirectional calibration value. The bidirectional calibration value is the spacing value of the ink droplet landing points after the ink is printed at the same position when the printing carriage prints back and forth during the uniform speed printing process. This spacing value is twice the second distance, so the second distance is half of the bidirectional calibration value. In other embodiments, the uniform flight time of the ink droplets can also be obtained based on the distance between the printing carriage and the printing medium and the gravitational acceleration, and the corresponding second distance can be obtained based on the uniform flight time of the ink droplets.

[0031] According to the first speed corresponding to the printing carriage at the starting printing position, the flight speed of the ink droplets ejected from the nozzle at this position can be known. Combined with the flight distance and flight speed of the ink droplets when in uniform motion, the flight distance (recorded as the first distance) that the ink droplets travel from being ejected from the starting printing position to falling on the printing medium can be obtained. According to the flight distance of the ink droplets when the printing carriage moves at variable speeds and the flight distance of the printing carriage when in uniform motion, the inkjet grating value is adjusted to obtain the inkjet grating adjustment value. According to the inkjet grating adjustment value, the nozzle in the printing carriage is driven to spray ink, thereby adjusting the landing point of the ink droplets so that the ink droplet landing point is uniform, thereby improving the image printing quality.

[0032] Preferably, the step of obtaining the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, includes: Obtain the movement speed of the printing carriage during inkjet printing at a uniform speed along the X-axis direction, recorded as the second speed; Obtaining a corresponding movement distance when the printing carriage accelerates from rest to the first speed, recorded as the accelerated movement distance; Acquire the acceleration of the printing carriage when it performs variable speed motion according to the accelerated motion distance and the second speed; Determine the starting printing position of the printing carriage in the phase of variable speed movement along the X-axis; A first speed of the printing carriage corresponding to the starting printing position is acquired according to the acceleration.

[0033] Specifically, Figure 3 As shown, let the speed of the printing carriage moving uniformly along the X-axis be V max , recorded as the second speed, V max It can be determined by the operator according to the actual situation or by the printing system according to other relevant printing parameters such as drive current. maxThe distance traveled is S max , recorded as the accelerated motion distance, such as Figure 1 As shown, the accelerated motion distance is actually the distance between the printing carriage from the stationary point to the boundary of the printing area 4. The acceleration a of the printing carriage can be calculated based on the second speed and the accelerated motion distance.

[0034] Specifically, according to the formula: (1); The acceleration of the printing carriage in the speed-changing motion stage can be obtained. After the acceleration is obtained, it is known that the distance between the starting printing position and the stationary point is S0, and the speed corresponding to the starting printing position, that is, the value of the first speed V0, can be obtained.

[0035] Preferably, the acquiring, according to the first speed and the second distance, a flying distance of the ink droplets along the X-axis direction when the printing carriage ejects the ink droplets from the starting printing position, recorded as the first distance, comprises: Obtaining the vertical movement distance and vertical speed corresponding to the ink droplets ejected when the printing carriage moves at a uniform speed in the X-axis direction and falling along the Z-axis direction; wherein the Z-axis direction is perpendicular to the X-axis direction and the Y-axis direction, and the Y-axis direction is the direction in which the printing carriage steps relative to the printing medium; Obtaining a second ratio of the vertical movement distance to the vertical speed according to a first ratio of the second distance to the second speed; The flying distance of the ink droplet along the X-axis direction when the ink droplet is ejected from the starting printing position is obtained according to the first speed and the second ratio, which is the first distance.

[0036] Specifically, to simplify the calculation, it is assumed that the ink droplet maintains a uniform motion in the vertical and horizontal directions after leaving the nozzle. The flight distance of the ink droplet in the X-axis direction and the vertical direction (Z-axis direction, perpendicular to the X-axis and Y-axis) after leaving the nozzle is recorded as and (vertical movement distance), the flight speed in the X-axis direction and the Z-axis direction are recorded as and (vertical velocity), then we can get the following formula: (2); If the printing carriage is driven to perform bidirectional printing calibration while moving at a constant speed on the X axis, the bidirectional calibration value k obtained is twice the ink droplet flight distance (second distance) when the print head is moving at a constant speed. According to formula (2), the second distance or the bidirectional calibration value k can be used together with the speed during uniform motion. Calculate result.

[0037] The speed of the printing carriage in the X-axis direction when the ink drop leaves the nozzle is the flying speed of the ink drop in the air. The flying distance of the ink drop in the X-axis direction at the starting printing position is calculated by formula (2), which is denoted as m0, where , k and The value of is known, so the value of m0, that is, the first distance, can be obtained.

[0038] Preferably, acquiring the inkjet grating adjustment value according to the first distance and the second distance comprises: Acquire a reference ink drop landing point deviation value according to the first distance and the second distance; Obtaining the number of variable speed printing pixels according to the printing width and printing accuracy in the X-axis direction during the variable speed movement stage; The inkjet raster adjustment value corresponding to each variable speed printing pixel is obtained according to the reference ink drop landing point deviation value and the variable speed printing pixel quantity.

[0039] Specifically, the difference between the ink droplet flight distance at the starting printing position (i.e., the first distance) and the ink droplet flight distance at a constant speed (i.e., the second distance) is obtained. ,in ,So , and record the difference as the reference ink drop point deviation value. is a relatively small distance (for example, 3 pixels), within which the X-axis motion speed of the printing carriage can be approximately considered constant. Figure 4 As shown, for the first pixel of each pass, only the raster position of the inkjet needs to be adjusted. The flying distance of the ink droplet corresponding to the pixel after being ejected from the nozzle can be consistent with the flying distance during normal uniform motion, that is, it ensures that the ink droplet landing point during the variable speed motion stage is consistent with that during uniform motion. The inkjet raster adjustment value corresponding to the first pixel.

[0040] According to the inkjet grating adjustment value corresponding to the first pixel, i.e., the reference ink drop point deviation value, the inkjet grating adjustment values ​​corresponding to other pixel points printed in the variable speed motion stage can be obtained. These pixel points printed in the variable speed motion stage are called variable speed printing pixel points. The number of variable speed printing pixel points can be obtained according to the printing width and printing accuracy of the printing carriage in the X-axis direction during the variable speed motion. The printing width in the variable speed motion stage is S max -S0, assuming that the printing precision is D dpi, convert the printing width into inches and then multiply it by the printing precision to get the number of variable speed printing pixels, recorded as h. It should be noted that when the printing carriage moves to the uniform speed stage, the inkjet grating adjustment value must be equal to 0, that is, the inkjet grating value does not need to be adjusted in the uniform speed stage. To simplify the calculation, the inkjet grating adjustment value corresponding to the starting printing position is Divide into h parts, and the corresponding inkjet raster adjustment value decreases for each pixel printed during the acceleration phase. The inkjet raster adjustment value for printing the first pixel is , the inkjet raster adjustment value for printing the second pixel is ...The inkjet grating adjustment value of the hth pixel is ...In this way, when the printing carriage moves to the uniform speed stage, that is, when printing the h+1th pixel, the inkjet grating adjustment value is 0.

[0041] It is also worth pointing out that the formula , where n = 1, 2, ..., h; is the inkjet grating adjustment value corresponding to each pixel point in the acceleration phase. The first variable speed printing pixel point printed in the acceleration phase is the pixel point farthest from the uniform speed printing pixel point, while in the reduction phase, the first variable speed printing pixel point is the next pixel point of the uniform speed printing pixel point. At this time, the inkjet grating adjustment value to the hth variable speed printing pixel point is , adjust the inkjet raster value Divide into h parts, and increase the corresponding inkjet raster adjustment value by 100% for each pixel printed during the deceleration phase. , then the inkjet grating adjustment value of the first variable speed printing pixel after the print carriage enters the deceleration stage is The inkjet raster adjustment value of the second variable speed printing pixel is , the inkjet grating adjustment value for the hth variable speed printing pixel is ,at this time , where n = 1, 2, …, h.

[0042] The inkjet grating adjustment value corresponding to each variable speed printing pixel point in the variable speed printing stage is obtained, and the ejection timing of the corresponding ink droplets is adjusted according to the inkjet grating adjustment value corresponding to each variable speed printing pixel point, so as to adjust the position where the ink droplets ejected during the variable speed motion fall on the printing medium, such as Figure 5 As shown in the figure, they are schematic diagrams of the ink droplet flight trajectory and ink droplet landing point in the acceleration stage, uniform speed stage and deceleration stage of the printing vehicle, where m0 in the acceleration stage is the flight distance of the ink droplet corresponding to the first variable speed printing pixel point, m1 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and so on, and m2 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and m3 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and m4 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and m5 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and m6 is the flight distance of the ink droplet corresponding to the second variable speed printing pixel point, and m7 is the flight distance of the ink droplet corresponding to the first variable speed printing pixel point, and m8 is the flight distance of the ink droplet corresponding to the first variable speed printing pixel point, and m9 is the flight distance of the ink droplet corresponding to the first variable speed printing pixel point, and m1 ... n is the flying distance of the ink droplet corresponding to the first variable speed printing pixel, m n-1 The flying distance of the ink droplet corresponding to the second variable speed printing pixel is calculated by using the inkjet grating adjustment value to make the intervals between the ink droplets (or pixels) uniform during variable speed printing and consistent with those during uniform speed printing, thereby ensuring the image printing effect. Since printing is performed during the variable speed movement stage, the printing efficiency in each PASS printing process can be significantly improved, thereby increasing the printing capacity.

[0043] In addition to the fact that changes in speed may cause uneven ink drop spacing and affect printing accuracy, changes in other parameters such as ink viscosity and nozzle temperature will also affect the ink droplet ejection speed and flight trajectory. In one embodiment, before driving the printing carriage to print the printing task according to the acquired inkjet grating adjustment value, the printing carriage can also be driven to perform test printing according to the inkjet grating adjustment value to detect whether there is a deviation between the actual landing point of the ink drop and the ideal landing point. If there is a large deviation, the inkjet grating adjustment value needs to be further corrected to ensure high printing quality in the speed change stage. The specific steps are: Controlling the printing carriage to spray ink droplets at corresponding positions according to the inkjet grating adjustment value; Monitoring the flight trajectory and landing position of the ink drop, and calculating a first distance deviation between an actual landing point of the ink drop and an expected landing point; If the first distance deviation is greater than a first threshold, the nozzle temperature and ink viscosity in the printing carriage are obtained; Obtaining a first correction coefficient according to a first difference between the nozzle temperature and a preset standard temperature, and a second difference between the ink viscosity and a preset standard viscosity; Adjusting the inkjet grating adjustment value according to the first distance deviation and the first correction coefficient to obtain a first corrected grating adjustment value; Controlling the printing carriage to eject ink droplets at corresponding positions according to the first corrected grating adjustment value; Monitoring the flight trajectory and landing position of the ink drop, and calculating a second distance deviation between an actual landing point of the ink drop and an expected landing point; If the second distance deviation is less than or equal to the first threshold but greater than the second threshold, a heating coefficient is obtained according to the first difference and the second difference, and the nozzle is heated according to the heating coefficient so that a third difference between the nozzle temperature and the preset standard temperature is within a preset temperature difference range and a fourth difference between the ink viscosity and the preset standard viscosity is within a preset viscosity difference range; Obtaining a second correction coefficient according to the third difference and the fourth difference; The inkjet grating adjustment value is adjusted according to the second distance deviation and the second correction coefficient to obtain a second corrected grating adjustment value; A new inkjet raster adjustment value is obtained according to the second corrected raster adjustment value.

[0044] Specifically, before the printing carriage is driven to perform inkjet printing of the actual printing task according to the inkjet grating adjustment value, a test print is first performed, and the printing carriage is controlled to spray ink droplets at the corresponding position according to the inkjet grating adjustment value, and the flight trajectory and landing position of the ink droplets are monitored in real time. By calculating the first distance deviation between the actual landing point of the ink droplet and the expected landing point, it is possible to determine whether the current printing quality meets the requirements. If the first distance deviation is greater than the preset first threshold, it means that the ink droplet landing point deviation is large, which may affect the printing effect. At this time, the temperature of the nozzle in the printing carriage and the viscosity data of the ink are further obtained. The nozzle temperature and the viscosity of the ink are important factors affecting the flight trajectory and landing point of the ink droplet. Too high or too low temperature, too high or too low viscosity will cause changes in the flight speed and landing point of the ink droplet. Next, according to the first difference between the nozzle temperature and the preset standard temperature, and the second difference between the ink viscosity and the preset standard viscosity, the first correction coefficient is calculated. This correction coefficient is used to make a preliminary adjustment to the inkjet grating adjustment value to compensate for the ink droplet landing point deviation caused by the difference in nozzle temperature and ink viscosity. A first correction coefficient is used to generate a first correction grating adjustment value, and the printing carriage is controlled to eject ink droplets again at a corresponding position according to the correction value.

[0045] Exemplarily, the first correction coefficient is obtained by the following formula: ; Among them, ΔT is the first difference, Δη is the second difference, α is the influence coefficient of the nozzle temperature difference on the correction coefficient, β is the influence coefficient of the ink viscosity difference on the correction coefficient, and α and β can be obtained by fitting experimental data. For example, if the nozzle temperature is higher than the standard temperature (ΔT>0), the flying speed of the ink droplet may be accelerated, resulting in a forward landing point. At this time, α is a negative value, which is used to reduce the inkjet grating adjustment value. If the ink viscosity is higher than the standard viscosity (Δη>0), the flying speed of the ink droplet may be slowed down, resulting in a backward landing point. At this time, β is a positive value, which is used to increase the inkjet grating adjustment value.

[0046] The first modified grating adjustment value is ΔSn1 =ΔSn +k1×ΔSn.

[0047] After obtaining the first correction grating adjustment value, in order to ensure the accuracy of the ink droplet landing point, the test printing can be performed again according to the first correction grating adjustment value, the flight trajectory and landing position of the ink droplet are monitored, and the second distance deviation is calculated. If the second distance deviation is less than or equal to the first threshold but greater than the second threshold, it means that the ink droplet landing point deviation has been reduced, but it has not yet reached the ideal state. At this time, the heating coefficient is calculated according to the first difference between the nozzle temperature and the standard temperature and the second difference between the ink viscosity and the standard viscosity. The calculation relationship between the first difference, the second difference and the heating coefficient can be obtained through experiments. The heating coefficient is used to adjust the heating power of the nozzle so that the nozzle temperature gradually approaches the preset standard temperature, and the ink viscosity also gradually approaches the preset standard viscosity. Through heating adjustment, the third difference between the nozzle temperature and the standard temperature will be controlled within the preset temperature difference range, and the fourth difference between the ink viscosity and the standard viscosity will also be controlled within the preset viscosity difference range. After the nozzle temperature and the ink viscosity are effectively adjusted, the second correction coefficient will be calculated according to the third difference and the fourth difference. This correction coefficient is used to further adjust the inkjet grating adjustment value to compensate for the ink drop point deviation caused by temperature and viscosity changes. The second correction coefficient is used to generate the second corrected grating adjustment value. The specific calculation method is similar to the first corrected grating adjustment value mentioned above, which will not be repeated here. In other embodiments, the calculation method can also be adjusted according to the actual application situation. The second corrected grating adjustment value is used as the new inkjet grating adjustment value. Then, according to the new inkjet grating adjustment value, the printing carriage is controlled to perform inkjet printing to ensure the accuracy of the ink drop point and the stability of the printing quality. Moreover, by heating and adjusting the nozzle temperature and ink viscosity, it is possible to effectively deal with the influence of factors such as ambient temperature and humidity on the printing quality, and further improve the adaptability and stability of the printing system.

[0048] In addition to the influence of nozzle temperature and ink viscosity, in other embodiments, the influence of wind resistance on the flight trajectory and landing position of ink droplets can be further considered, and a new first correction coefficient or a second correction coefficient can be obtained by combining parameters such as nozzle temperature, ink viscosity and wind resistance, and then a new second corrected grating adjustment value or a second corrected grating adjustment value can be obtained, and the printing carriage can be driven to perform inkjet printing according to the second corrected grating adjustment value, so that the ink droplet landing point is more precise and better printing quality can be achieved.

[0049] In summary, the variable speed motion inkjet printing method of the printing carriage provided in the embodiment of the present invention is to obtain the motion speed corresponding to the starting printing position during the variable speed motion of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; obtain the flying distance of the ink droplets when the printing carriage is printing at a uniform speed along the X-axis direction, which is recorded as the second distance; obtain the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position according to the first speed and the second distance, which is recorded as the first distance; obtain the inkjet grating adjustment value according to the first distance and the second distance; and drive the printing carriage to perform inkjet printing during the variable speed motion along the X-axis direction according to the inkjet grating adjustment value. The method adjusts the ejection timing of the ink droplets during the variable speed motion printing process by the inkjet grating adjustment value, so that the intervals between the ink droplet landing points or pixel points during the variable speed printing are uniform and consistent with those during the uniform speed printing, thereby ensuring the image printing effect. Since printing is performed in the variable speed motion stage, the printing efficiency in each PASS printing process can be significantly improved, the printing capacity can be improved, and the utilization rate of the printing medium can also be improved, which is conducive to reducing material costs.

[0050] Embodiment 2

[0051] See also Figure 6 The embodiment of the present invention provides a printing carriage variable speed motion inkjet printing device 200, the device 200 comprising: The first speed acquisition module 201 is used to acquire the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; The second distance acquisition module 202 is used to acquire the flying distance of the ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, which is recorded as the second distance; A first distance acquisition module 203 is used to acquire, according to the first speed and the second distance, a flying distance of ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position, recorded as a first distance; A grating adjustment value acquisition module 204, configured to acquire an inkjet grating adjustment value according to the first distance and the second distance; The printing module 205 is used to drive the printing carriage to perform inkjet printing during the variable speed movement along the X-axis direction according to the inkjet grating adjustment value.

[0052] In summary, the variable speed motion inkjet printing device of the printing carriage provided in the embodiment of the present invention obtains the motion speed corresponding to the starting printing position during the variable speed motion of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; obtains the flying distance of the ink droplets when the printing carriage is printing at a uniform speed along the X-axis direction, which is recorded as the second distance; obtains the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position according to the first speed and the second distance, which is recorded as the first distance; obtains the inkjet grating adjustment value according to the first distance and the second distance; and drives the printing carriage to perform inkjet printing during the variable speed motion along the X-axis direction according to the inkjet grating adjustment value. The method adjusts the ejection timing of the ink droplets during the variable speed motion printing process by the inkjet grating adjustment value, so that the intervals between the ink droplet landing points or pixel points during the variable speed printing are uniform and consistent with those during the uniform speed printing, thereby ensuring the image printing effect. Since printing is performed in the variable speed motion stage, the printing efficiency in each PASS printing process can be significantly improved, and the printing capacity is improved.

[0053] Embodiment 3

[0054] In addition, the printing carriage variable speed motion inkjet printing method of the embodiment of the present invention can be implemented by a printing carriage variable speed motion inkjet printing device. Figure 7 A schematic diagram of the hardware structure of an inkjet printing device with a print carriage having variable speed motion provided by an embodiment of the present invention is shown.

[0055] The print carriage variable speed motion inkjet printing device may include a processor 301 and a memory 302 storing computer program instructions.

[0056] Specifically, the processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0057] The memory 302 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 302 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 302 may be inside or outside the data processing device. In a specific embodiment, the memory 302 is a non-volatile solid-state memory. In a specific embodiment, the memory 302 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0058] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement any one of the inkjet printing methods with variable speed motion of the printing carriage in the above embodiments.

[0059] In one example, the variable speed inkjet printing device for the printing carriage may further include a communication interface 303 and a bus 310. Figure 7 As shown, the processor 301, the memory 302, and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0060] The communication interface 303 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0061] Bus 310 includes hardware, software or both, and the parts of the printing carriage variable speed motion inkjet printing device are coupled to each other. For example, but not limitation, bus 310 may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 310 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0062] Embodiment 4

[0063] In addition, in combination with the inkjet printing method with variable speed motion of the printing carriage in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor 301, any of the inkjet printing methods with variable speed motion of the printing carriage in the above embodiment is implemented.

[0064] In summary, the variable speed motion inkjet printing method, device, equipment and storage medium provided by the embodiment of the present invention obtains the motion speed corresponding to the starting printing position during the variable speed motion of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; obtains the flight distance of the ink droplets when the printing carriage is uniformly printed along the X-axis direction, which is recorded as the second distance; obtains the flight distance of the ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position according to the first speed and the second distance, which is recorded as the first distance; obtains the inkjet grating adjustment value according to the first distance and the second distance; and drives the printing carriage to perform inkjet printing during the variable speed motion along the X-axis direction according to the inkjet grating adjustment value. The method adjusts the ejection timing of the ink droplets during the variable speed motion printing process by the inkjet grating adjustment value, so that the intervals between the ink droplet landing points or pixel points during the variable speed printing are uniform and consistent with those during the uniform speed printing, thereby ensuring the image printing effect. Since printing is performed in the variable speed motion stage, the printing efficiency in each PASS printing process can be significantly improved, and the printing capacity is improved.

[0065] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0066] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0067] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0068] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for inkjet printing with a printing carriage having variable speed motion, characterized in that: The method comprises: Obtain the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, where the X-axis direction is the printing direction; Obtaining the flying distance of ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, recorded as a second distance; According to the first speed and the second distance, the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects the ink droplets from the starting printing position is obtained, and recorded as the first distance; Acquire an inkjet grating adjustment value according to the first distance and the second distance; According to the inkjet grating adjustment value, the printing carriage is driven to perform inkjet printing during the variable speed movement along the X-axis direction.

2. The inkjet printing method for printing carriage with variable speed motion according to claim 1, characterized in that: The method of obtaining the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, recorded as the first speed, includes: Obtain the movement speed of the printing carriage during inkjet printing at a uniform speed along the X-axis direction, recorded as the second speed; Obtaining a corresponding movement distance when the printing carriage accelerates from rest to the first speed, recorded as the accelerated movement distance; Acquire the acceleration of the printing carriage when it performs variable speed motion according to the accelerated motion distance and the second speed; Determine the starting printing position of the printing carriage in the phase of variable speed movement along the X-axis; A first speed of the printing carriage corresponding to the starting printing position is acquired according to the acceleration.

3. The inkjet printing method for printing carriage with variable speed motion according to claim 1, characterized in that: The step of obtaining the flying distance of ink droplets when the printing carriage is printing at a uniform speed along the X-axis direction, recorded as the second distance, includes: Obtaining a bidirectional calibration value when the printing carriage performs bidirectional calibration printing along the X-axis direction; The second distance is acquired according to the bidirectional calibration value.

4. The inkjet printing method for printing carriage with variable speed motion according to claim 2, characterized in that: The step of obtaining the flying distance of the ink droplets along the X-axis direction when the printing carriage ejects the ink droplets from the starting printing position according to the first speed and the second distance, recorded as the first distance, includes: Obtaining the vertical movement distance and vertical speed corresponding to the ink droplets ejected when the printing carriage moves at a uniform speed in the X-axis direction and falling along the Z-axis direction; wherein the Z-axis direction is perpendicular to the X-axis direction and the Y-axis direction, and the Y-axis direction is the direction in which the printing carriage steps relative to the printing medium; Obtaining a second ratio of the vertical movement distance to the vertical speed according to a first ratio of the second distance to the second speed; The flying distance of the ink droplet along the X-axis direction when the ink droplet is ejected from the starting printing position is obtained according to the first speed and the second ratio, which is the first distance.

5. The inkjet printing method for printing carriage with variable speed motion according to claim 1, characterized in that: The obtaining of the inkjet grating adjustment value according to the first distance and the second distance comprises: Acquire a reference ink drop landing point deviation value according to the first distance and the second distance; Obtaining the number of variable speed printing pixels according to the printing width and printing accuracy in the X-axis direction during the variable speed movement stage; The inkjet raster adjustment value corresponding to each variable speed printing pixel is obtained according to the reference ink drop landing point deviation value and the variable speed printing pixel quantity.

6. The inkjet printing method for printing carriage with variable speed motion according to claim 5, characterized in that: The obtaining of a reference ink droplet landing point deviation value according to the first distance and the second distance comprises: The reference ink drop landing point deviation value is obtained according to the following formula: ; in is the reference ink drop landing point deviation value, L is the second distance, and m0 is the first distance.

7. The inkjet printing method for printing carriage with variable speed motion according to claim 6, characterized in that: The step of obtaining the inkjet raster adjustment value corresponding to each variable speed printing pixel point according to the reference ink drop landing point deviation value and the variable speed printing pixel point quantity comprises: When the printing carriage is in accelerated motion, , n = 1,2,…,h; When the printing carriage is in deceleration motion, , n = 1,2,…,h; in, The inkjet raster adjustment value for the nth variable speed printing pixel. is the reference ink drop landing point deviation value, and h is the number of variable speed printing pixels.

8. The inkjet printing method for printing carriage with variable speed motion according to any one of claims 1 to 7, characterized in that: Before the printing carriage is driven to perform inkjet printing in the process of variable speed movement along the X-axis direction according to the inkjet grating adjustment value, the method further comprises: Controlling the printing carriage to spray ink droplets at corresponding positions according to the inkjet grating adjustment value; Monitoring the flight trajectory and landing position of the ink drop, and calculating a first distance deviation between an actual landing point of the ink drop and an expected landing point; If the first distance deviation is greater than a first threshold, the nozzle temperature and ink viscosity in the printing carriage are obtained; Obtaining a first correction coefficient according to a first difference between the nozzle temperature and a preset standard temperature, and a second difference between the ink viscosity and a preset standard viscosity; Adjusting the inkjet grating adjustment value according to the first distance deviation and the first correction coefficient to obtain a first corrected grating adjustment value; Controlling the printing carriage to eject ink droplets at corresponding positions according to the first corrected grating adjustment value; Monitoring the flight trajectory and landing position of the ink drop, and calculating a second distance deviation between an actual landing point of the ink drop and an expected landing point; If the second distance deviation is less than or equal to the first threshold but greater than the second threshold, a heating coefficient is obtained according to the first difference and the second difference, and the nozzle is heated according to the heating coefficient so that a third difference between the nozzle temperature and the preset standard temperature is within a preset temperature difference range and a fourth difference between the ink viscosity and the preset standard viscosity is within a preset viscosity difference range; Obtaining a second correction coefficient according to the third difference and the fourth difference; The inkjet grating adjustment value is adjusted according to the second distance deviation and the second correction coefficient to obtain a second corrected grating adjustment value; A new inkjet raster adjustment value is obtained according to the second corrected raster adjustment value.

9. A variable speed inkjet printing device for a printing carriage, characterized in that: The device comprises: A first speed acquisition module is used to acquire the movement speed corresponding to the starting printing position during the variable speed movement of the printing carriage along the X-axis direction, which is recorded as the first speed, wherein the X-axis direction is the printing direction; A second distance acquisition module is used to acquire the flying distance of the ink droplets when the printing carriage prints at a uniform speed along the X-axis direction, which is recorded as the second distance; A first distance acquisition module, used for acquiring, according to the first speed and the second distance, a flying distance of ink droplets along the X-axis direction when the printing carriage ejects ink droplets from the starting printing position, recorded as a first distance; A grating adjustment value acquisition module, used for acquiring an inkjet grating adjustment value according to the first distance and the second distance; The printing module is used to drive the printing carriage to perform inkjet printing during the variable speed movement along the X-axis direction according to the inkjet grating adjustment value.

10. A printing carriage variable speed motion inkjet printing device, characterized in that: include: At least one processor, at least one memory and computer program instructions stored in the memory, when the computer program instructions are executed by the processor, implement the method according to any one of claims 1 to 8.

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