Inkjet printing control system and method for intelligently adjusting inkjet timing

Abstract

The present invention relates to the field of inkjet printing technology, and in particular to an inkjet printing control system and method for intelligently adjusting inkjet timing, comprising the following steps: S1: measuring the distance from the nozzle to paper at the nozzle location; S2: calculating an approximate distance between the nozzle and paper based on the collected distance from the nozzle to paper at the nozzle location; S3: obtaining the nozzle movement speed through a speed sensor, and solving the flight distance of the ink droplets in the X direction based on the ink droplet ejection speed of the nozzle; and S4: calculating a trigger time difference based on the distance from the nozzle to paper, the ink droplet ejection speed of the nozzle, and the nozzle movement speed.

Description

Technical Field

[0001] The present invention relates to the field of inkjet printing technology, and in particular to an inkjet printing control system and method for intelligently adjusting inkjet timing. Background Art

[0002] As the printing width increases, the distance between the print head and the paper increases, affected by the print head support mechanism. Consequently, the requirements for the processing accuracy of the printer mechanism also increase significantly. The print head in a typical printing device is usually mounted on a carriage, which in turn is mounted on a set of mechanisms that can move laterally. This mechanism includes rails and sliders that support the carriage. However, due to production, processing, and assembly factors, when the slider moves on the rails, the distance from each horizontal measuring point to the platform is not easily maintained at a constant or very small deviation. This will seriously affect the printing quality. Summary of the Invention

[0003] The purpose of the present invention is to solve the defects mentioned in the above background technology by proposing an inkjet printing control system and method for intelligently adjusting inkjet timing.

[0004] The technical solution of the present invention is: adjusting the inkjet trigger time difference through the real-time data of the nozzle, and the real-time data of the nozzle includes any one of the nozzle movement speed, the distance from the nozzle to the paper, the nozzle ink droplet ejection speed, or a combination of any two or three of the above three items.

[0005] The technical solution 1 adopted in the present invention is as follows:

[0006] 1. An inkjet printing control method for intelligently adjusting inkjet timing, characterized in that it comprises the following steps:

[0007] S1: Measure the distance between the nozzle and the paper at the nozzle location;

[0008] S2: Obtain the nozzle movement speed through the sensor, and calculate the flight distance or time of the ink droplet in the X direction based on the collected nozzle position distance to the paper and the nozzle droplet ejection speed;

[0009] S3: Adjust the inkjet triggering time difference according to the flight time of the ink droplet in the X direction.

[0010] The second technical solution adopted by the present invention is as follows:

[0011] An inkjet printing control method for intelligently adjusting inkjet timing is provided, comprising the following steps:

[0012] S1: Measure the distance between the print head and the paper at the selected position in the print head moving direction and record it in the storage unit;

[0013] S2: Calculate the approximate distance between the nozzle and the paper at the printing resolution based on the collected distance between the nozzle and the paper at the selected position;

[0014] S3: Obtain the moving speed of the ink droplet through the sensor and solve the flying distance of the ink droplet in the X direction;

[0015] S4: Calculate the trigger time difference based on the distance between the nozzle and the paper, the ink droplet ejection speed of the nozzle hole, and the nozzle movement speed.

[0016] As a preferred technical solution of the present invention: the distance between the nozzle and the paper at the selected position in the moving direction of the nozzle in S1 is measured by an ultrasonic sensor, all positions on the printing resolution are measured, and the distance H from the nozzle to the paper at the selected position in the moving direction of the nozzle is measured.

[0017] As a preferred technical solution of the present invention, the distance between the nozzle and the paper is calculated by using the distance between the nozzle and the paper at a selected position in the direction of movement of the nozzle, and the distance between the nozzle and the paper is calculated by extrapolation. The calculation steps are as follows:

[0018] S2.1: Construct a polynomial based on the distance from the nozzle to the paper at the n selected positions known previously as follows:

[0019] H(t)=a0+a1t+a2t 2 +…+a m t m

[0020] Where H(t) represents the predicted distance at timestamp t, (a0, a1, a2, ..., a m ) represents the parameter, t represents the corresponding time;

[0021] S2.2: Model training is performed based on the existing information. The calculation formula is as follows:

[0022]

[0023] Where a=(a0,a1,a2…a n ) is the parameter vector, arg min a () is to find the minimum parameter of a, H is the distance vector H=(H0,H1,…,H n ) T ,, It is an n×(n+1) dimensional matrix and the i-th row is (1,t i ,t i 2 ,…,t i n );

[0024] S2.3: Perform a quadratic fit on H(t) to prevent overfitting. The calculation formula is as follows:

[0025] H(t0+Δt)=a0+a1(t0+Δt)+a2(t0+Δt) 2 +…+a m (t0+Δt) m

[0026] H(Δt)≈a0+a1(t+nΔt)+a2(t+nΔt) 2 +…+a m (t+nΔt) m

[0027] Where H(t0+Δt) represents the distance from the print head to the paper at the timestamp t0+Δt, n represents the extrapolation by n times, and H(Δt) represents the approximate distance obtained after extrapolation by nΔt.

[0028] As a preferred technical solution of the present invention: in S3, the speed sensor is used to obtain the nozzle movement speed v x , and the nozzle droplet ejection reference speed v provided by the inkjet head manufacturer y .

[0029] As a preferred technical solution of the present invention, the flight distance of the ink droplet in the X direction is calculated based on the distance from the nozzle to the paper. The calculation steps are as follows:

[0030] S3.1: The distance from the nozzle to the paper and the ink droplet ejection velocity v y Solve the flight time of the ink droplet before it reaches the paper. The calculation formula is as follows:

[0031] H h =v y t h +0.5gt' 2

[0032]

[0033] where v y is the ink droplet ejection velocity of the nozzle, t h is the ink drop flight time, g is the acceleration due to gravity, H h is the distance from the nozzle to the paper;

[0034] S3.2: Through t h To solve the flying distance of the ink droplet in the X direction, the calculation formula is as follows:

[0035]

[0036] Where D is the flying distance of the ink droplet in the X direction, v xIndicates the nozzle moving speed, t h is the ink drop flight time, v y is the ink droplet ejection velocity of the nozzle, H h is the distance from the nozzle to the paper.

[0037] As a preferred technical solution of the present invention: in S4, the trigger time difference is calculated according to the flying distance of the ink droplet in the X direction.

[0038] As a preferred technical solution of the present invention: the method for calculating the trigger time difference, i.e., the inkjet trigger timing, is calculated by the following formula:

[0039]

[0040] Where D0 represents the reference inkjet flight distance, v x0 represents the reference speed of the nozzle, t0 represents the reference flight time, v x Indicates the nozzle moving speed, v y0 is the ink droplet ejection speed of the nozzle, H0 represents the reference distance between the nozzle and the paper;

[0041] When the ink droplet ejection speed v y =v y0 Unchanged, head moving reference speed v x =v x0 If the value of the ink droplet is constant, the flying distance of the ink droplet in the X direction is:

[0042]

[0043] Among them D x is the flying distance of ink droplet in X direction, v x0 Indicates the reference speed of the nozzle movement, v y0 is the ink droplet ejection velocity of the nozzle, H x is the distance between the nozzle and the paper;

[0044] The ink position difference is:

[0045] ΔD=D x -D0

[0046] Where ΔD is the ink position deviation, D x is the flying distance of the ink droplet in the X direction, D0 is the reference inkjet flying distance, and the trigger time difference is:

[0047]

[0048] Where Δt is the trigger time difference, v x is the nozzle moving speed, ΔD is the ink position deviation, H x is the distance between the nozzle and the paper, H0 is the reference distance between the nozzle and the paper, v y0The ink droplet ejection speed of the nozzle.

[0049] As a preferred technical solution of the present invention: the inkjet triggering timing method is arranged such that when the ink droplet ejection speed of the nozzle is constant and the nozzle movement speed is variable, the following is obtained:

[0050]

[0051] where Δt' x v is the trigger time difference when the nozzle droplet ejection speed is constant and the nozzle movement speed is variable, x is the nozzle moving speed, v x0 Indicates the reference speed of the nozzle movement, v y0 is the ink droplet ejection velocity of the nozzle, H x is the distance between the print head and the paper, and H0 is the reference distance from the print head to the paper.

[0052] [Add application description here]

[0053] As a technical solution of the present invention, it is applied in an inkjet printing control system that intelligently adjusts the inkjet timing.

[0054] The inkjet printing control system and method for intelligently adjusting inkjet timing provided by the present invention have the following beneficial effects compared with the prior art:

[0055] The present invention collects the distance between the nozzle and the paper to predict the distance on the subsequent timestamp and detects the speed of the nozzle spraying ink, so as to better estimate the ink landing point; the improved least squares method is used to perform data fitting, thereby improving the data fitting effect and the reliability of predicting the distance between the nozzle and the paper. By predicting the distance between the nozzle and the paper, the printing time difference can be controlled at the subsequent timestamp to improve the printing quality and reduce the printing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The algorithm flow of the preferred embodiment of the present invention is Figure 1 ;

[0057] Figure 2 The algorithm flow of the preferred embodiment of the present invention is Figure 2 ;

[0058] Figure 3 This is a trigger diagram for inkjet triggering in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0059] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this embodiment can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] Reference Figure 1-2 The preferred embodiment of the present invention provides an inkjet printing control method for intelligently adjusting inkjet timing, comprising the following steps:

[0061] S1: Measure the distance between the print head and the paper at the selected position in the print head moving direction and record it in the storage unit;

[0062] S2: Calculate the approximate distance between the nozzle and the paper at the printing resolution based on the collected distance between the nozzle and the paper at the selected position;

[0063] S3: Obtain the moving speed of the ink droplet through the speed sensor and solve the flying distance of the ink droplet in the X direction;

[0064] S4: Calculate the trigger time difference based on the distance between the nozzle and the paper, the ink droplet ejection speed of the nozzle hole, and the nozzle movement speed.

[0065] In S1, the distance between the nozzle and the paper at the selected position in the nozzle moving direction is measured by an ultrasonic sensor. All positions on the printing resolution are measured to obtain the distance H between the nozzle and the paper at the selected position in the nozzle moving direction.

[0066] The distance between the nozzle and the paper is calculated by using the distance between the nozzle and the paper at a selected position in the direction of movement of the nozzle. The distance between the nozzle and the paper is calculated by extrapolation. The calculation steps are as follows:

[0067] S2.1: Construct a polynomial based on the distance from the nozzle to the paper at the n selected positions known previously as follows:

[0068] H(t)=a0+a1t+a2t 2 +…+a m t m

[0069] Where H(t) represents the predicted distance at timestamp t, (a0, a1, a2, ..., a m ) represents the parameter, t represents the corresponding time;

[0070] S2.2: Model training is performed based on the existing information. The calculation formula is as follows:

[0071]

[0072] Where a=(a0,a1,a2…a n ) is the parameter vector, arg min a () is to find the minimum parameter of a, H is the distance vector H=(H0,H1,…,H n ) T ,, It is an n×(n+1) dimensional matrix and the i-th row is (1,t i ,t i 2 ,…,t i n );

[0073] S2.3: Perform a quadratic fit on H(t) to prevent overfitting. The calculation formula is as follows:

[0074] H(t0+Δt)=a0+a1(t0+Δt)+a2(t0+Δt) 2 +…+a m (t0+Δt) m

[0075] H(Δt)≈a0+a1(t+nΔt)+a2(t+nΔt) 2 +…+a m (t+nΔt) m

[0076] Where H(t0+Δt) represents the distance from the print head to the paper at the time stamp t0+Δt, n represents the extrapolation by n times, and H(Δt) represents the approximate distance obtained after extrapolation by nΔt. In view of this, this embodiment constructs a quadratic polynomial:

[0077] H(t)=a0+a1t+a2t 2

[0078] The parameters (a0, a1, a2) are solved by the matrix expression of the least squares method. is 3×4, and the i-th row is (1,t i ,t i 2 ) is calculated by the formula:

[0079]

[0080] Solve the parameters (a0, a1, a2). In order to make the fitting effect better, the quadratic fitting method is used to perform another fitting to increase the fitting effect.

[0081] H(t0+Δt)=a0+a1(t0+Δt)+a2(t0+Δt) 2

[0082] H(Δt)≈a0+a1(t+nΔt)+a2(t+nΔt) 2

[0083] nΔt is the final effect of extrapolation n times, and the expression function of H is finally obtained.

[0084] In step S3, the speed sensor is used to obtain the ink droplet ejection speed v of the nozzle. y and nozzle moving speed v x .

[0085] The distance between the nozzle and the paper is used to calculate the flying distance of the ink droplet in the X direction. The calculation steps are as follows:

[0086] S3.1: The distance from the nozzle to the paper and the ink droplet ejection velocity v y Solve the flight time of the ink droplet before it reaches the paper. The calculation formula is as follows:

[0087] H h =v y t h +0.5gt' 2

[0088]

[0089] where v y is the ink droplet ejection velocity of the nozzle, t h is the ink drop flight time, g is the acceleration due to gravity, H h is the distance from the nozzle to the paper;

[0090] S3.2: Through t h To solve the flying distance of the ink droplet in the X direction, the calculation formula is as follows:

[0091]

[0092] Where D is the flying distance of the ink droplet in the X direction, v x Indicates the nozzle moving speed, t h is the ink drop flight time, v y is the ink droplet ejection velocity of the nozzle, H h is the distance from the nozzle to the paper.

[0093] In S4, the trigger time difference is calculated based on the flying distance of the ink droplet in the X direction.

[0094] The method for calculating the trigger time difference, i.e., the inkjet trigger timing, is calculated by the following formula:

[0095]

[0096] Where D0 represents the reference inkjet flight distance, vx0 represents the reference speed of the nozzle, t0 represents the reference flight time, v x Indicates the nozzle moving speed, v y0 is the ink droplet ejection velocity of the nozzle, h0 represents the reference distance between the nozzle and the paper;

[0097] When the ink droplet ejection speed v y =v y0 Unchanged, head moving reference speed v x =v x0 If the value of the ink droplet is constant, the flying distance of the ink droplet in the X direction is:

[0098]

[0099] Among them D x is the flying distance of ink droplet in X direction, v x0 Indicates the reference speed of the nozzle movement, v y0 is the ink droplet ejection velocity of the nozzle, H x is the distance between the nozzle and the paper;

[0100] The ink position difference is:

[0101] ΔD=D x -D0

[0102] Where ΔD is the ink position deviation, D x is the flying distance of the ink droplet in the X direction, D0 is the reference inkjet flying distance, and the trigger time difference is:

[0103]

[0104] Where Δt is the trigger time difference, v x is the nozzle moving speed, ΔD is the ink position deviation, H x is the distance between the nozzle and the paper, H0 is the reference distance between the nozzle and the paper, v y0 The ink droplet ejection speed of the nozzle.

[0105] The inkjet triggering timing method is arranged as follows when the nozzle ink droplet ejection speed is variable and the nozzle movement speed is variable:

[0106]

[0107]

[0108] where Δt x v is the trigger time difference when the nozzle droplet ejection speed is variable and the nozzle movement speed is variable, x is the nozzle moving speed, v y is the ink droplet ejection velocity of the nozzle, H xis the distance between the nozzle and the paper, D0 is the reference nozzle flight distance, H0 is the reference distance from the nozzle to the paper, v x0 Indicates the reference speed of the nozzle movement, v y0 The ink droplet ejection speed of the nozzle.

[0109] The inkjet triggering timing method is arranged as follows when the ink droplet ejection speed of the nozzle hole is constant and the nozzle movement speed is variable:

[0110]

[0111] Since the ejection speed of ink droplets from the nozzle remains unchanged, v y =v y0 so:

[0112]

[0113] where Δt' x v is the trigger time difference when the nozzle droplet ejection speed is constant and the nozzle movement speed is variable, x is the nozzle moving speed, v x0 Indicates the reference speed of the nozzle movement, v y0 is the ink droplet ejection velocity of the nozzle, H x is the distance between the print head and the paper, and H0 is the reference distance from the print head to the paper.

[0114] Specifically, the calculation method of inkjet triggering timing is:

[0115] Let the effective resolution of the position sensor be RES readings per inch, which is equivalent to each reading representing the distance R S ,in

[0116]

[0117] C1: At the moment when the reading value of each position sensor changes, calculate the estimated flight distance D of the inkjet at this position xn , estimated landing position;

[0118] C2: Calculate the distance to the next target "ink drop point" in X n The difference between the inkjet landing point at this position and the target landing point, E xn =D p -D xn ;

[0119] C3: According to the target landing point difference E xn Determine whether to perform inkjet operation. If E xn <R S The inkjet action is performed;

[0120] C4: According to the judgment result of C3, if inkjet is performed, then according to E xn And the current car moving speed V xn Calculate the inkjet delay time t fxn as follows:

[0121]

[0122] C5: Set the inkjet delay time and inkjet trigger conditions to start inkjet.

[0123] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0124] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An inkjet printing control method for intelligently adjusting inkjet timing, characterized in that: Adjusting the inkjet triggering time difference based on real-time data of the printhead, wherein the real-time data of the printhead includes any one of the speed of the printhead movement, the distance from the printhead to the paper, and the speed of the ink droplets ejected from the printhead, or a combination of any two or three of the foregoing; The steps are as follows: S1: Measure the distance between the print head and the paper at the selected position in the print head moving direction and record it in the storage unit; S2: Calculate the approximate distances between the nozzle and the paper at all positions based on the collected distances between the nozzle and the paper at the selected positions; S3: Obtain the ink droplet moving speed through the sensor; S4: Calculate the flying distance of the ink droplet in the X direction according to the distance between the nozzle and the paper, the ink droplet ejection speed of the nozzle, and the nozzle movement speed, and then calculate the trigger time difference.

2. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 1, characterized in that: In the above-mentioned S1, the distance between the nozzle and the paper at the position selected in the moving direction of the nozzle is measured by a distance sensor.

3. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 2, characterized in that: The distance sensor is an ultrasonic distance sensor.

4. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 2, characterized in that: The distance sensor is a time-of-flight distance sensor.

5. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 2, characterized in that: The distance sensor is an optical reflective angle distance sensor.

6. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 1, characterized in that: The positions selected in the measurement head moving direction in S1 are all positions on the printing resolution.

7. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 2, characterized in that: The approximate distances between the nozzles and the paper at all positions are calculated based on the collected distances between the nozzles and the paper at the selected positions by using the extrapolation method. The calculation steps are as follows: S2.1: Construct a polynomial based on the distance from the nozzle to the paper at the n selected positions known previously as follows: ； Where H(t) represents the predicted distance at timestamp t, ) represents the parameter, Indicates the corresponding time; S2.2: Model training is performed based on the existing information. The calculation formula is as follows: ； in is the parameter vector, To find the minimum parameter of a, H is the distance vector , for dimensional matrix and the i-th row ; S2.3: Perform a quadratic fit on H(t) to prevent overfitting. The calculation formula is as follows: ； ； in express The distance from the nozzle to the paper at the timestamp, represents extrapolation n times, Indicates extrapolation The approximate distance obtained.

8. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 1, characterized in that: In S3, the speed sensor is used to obtain the movement speed of the nozzle. .

9. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 1, characterized in that: In S3, the position data is obtained by the position sensor to calculate the current movement speed of the nozzle. .

10. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 8, characterized in that: The distance between the nozzle and the paper is used to calculate the flying distance of the ink droplet in the X direction. The calculation steps are as follows: S4.1: The distance from the nozzle to the paper and the ink droplet ejection speed of the nozzle Solve the flight time of the ink droplet before it reaches the paper. The calculation formula is as follows: ； ；； in is the ink droplet ejection speed of the nozzle, is the ink droplet flight time, is the acceleration due to gravity, is the distance from the nozzle to the paper; S4.2: Pass To solve the flying distance of the ink droplet in the X direction, the calculation formula is as follows: ； Where D is the flying distance of the ink droplet in the X direction, Indicates the speed of the nozzle movement. is the ink droplet flight time, is the ink droplet ejection speed of the nozzle, is the distance from the nozzle to the paper.

11. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 10, characterized in that: In S4 , the trigger time difference is calculated according to the flying distance of the ink droplet in the X direction.

12. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 11, characterized in that: The method for calculating the trigger time difference, i.e., the inkjet trigger timing, is calculated by the following formula: ； in Indicates the reference inkjet flying distance, Indicates the reference speed of the nozzle movement. Indicates the flight reference time, Indicates the speed of the nozzle movement. is the ink droplet ejection speed of the nozzle, Indicates the reference distance between the print head and the paper; When the ink droplet ejection speed of the nozzle Unchanged, nozzle movement reference speed If the value of the ink droplet is constant, the flying distance of the ink droplet in the X direction is: ； in is the flying distance of ink droplet in X direction, Indicates the reference speed of the nozzle movement. is the ink droplet ejection speed of the nozzle, is the distance between the nozzle and the paper; The ink position difference is: ； in The deviation of the ink position. is the flying distance of ink droplet in X direction, Indicates the reference inkjet flight distance, the trigger time difference is: ； in is the trigger time difference, is the nozzle moving speed, The deviation of the ink position. is the distance between the nozzle and the paper, is the reference distance between the print head and the paper, The ink droplet ejection speed of the nozzle.

13. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 12, characterized in that: The inkjet triggering timing method is arranged such that the ink droplet ejection speed of the nozzle is variable and the nozzle movement speed is variable: ； in The trigger time difference when the nozzle ink droplet ejection speed is variable and the nozzle movement speed is variable, is the nozzle moving speed, is the ink droplet ejection speed of the nozzle, is the distance between the nozzle and the paper, is the reference nozzle flight distance.

14. The inkjet printing control method for intelligently adjusting inkjet timing according to claim 13, characterized in that: The inkjet triggering timing method is arranged such that the ink droplet ejection speed of the nozzle is constant and the nozzle movement speed is variable. ； in It is the trigger time difference when the ejection speed of ink droplets from nozzles is constant and the movement speed of nozzles is variable. is the nozzle moving speed, Indicates the reference speed of the nozzle movement. is the ink droplet ejection speed of the nozzle, is the distance between the nozzle and the paper, It is the reference distance from the print head to the paper.

15. An inkjet printing control system that intelligently adjusts inkjet timing, characterized in that: An inkjet printing control method for intelligently adjusting inkjet timing according to any one of claims 2 to 14 is provided.

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