Method and system for printing on tilted print media using a printhead

Abstract

To provide a method and system for printing on a tilted print medium using a printhead.SOLUTION: A first or second printing policy is adopted. The first printing policy comprises: acquiring a tilted direction and angle of the print medium; acquiring a print start point; starting print by the printhead from the start point and continuously translating the printhead toward the tilted opposite side in a direction perpendicular to the movement of the tilted print medium; during the translation, controlling delay ink-jetting of an inkjet hole in the direction parallel to the movement of the tilted print medium; and forming a complete pattern on the tilted print medium. The second printing policy comprises: determining a tilted angle of the print medium and a position of a print standard point after tilted; adjusting a print content according to the tilted angle and the position of the print standard point to make the print content mirror-symmetrical with the print medium; and controlling the printhead to start printing on the print medium according to the print content when the print standard point is conveyed to the printhead.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of printing, and more particularly to printing on tilted print media using a print head. The present invention relates to a method and system for [Background technology]

[0002] In modern society, in order to meet people's demand for aesthetics, many products are polished during production. The turning process is performed to give the finished product an aesthetic appeal. The most common pattern processing method is printing, and the product is transmitted to the print head on the production line. The pattern is printed on the ceramic substrate and has a basic pattern after passing through the print head. The print head begins printing after it is transferred to the print head on the production line. However, in the prior art, the basic formation of the pattern is completed after passing through the There are defects in the pattern processing process of this type of product, especially in the printing process of ceramic tiles. In other words, when the printing medium is tilted, a complete or undistorted pattern is printed on the printing medium. When the print media is tilted, it is difficult to print properly, which can easily lead to defective products. , the pattern formed by the print head on the non-tilted print medium corresponds to the tilted print. Products based on tilted print media that do not correspond to the media pattern may be different from other products. The pattern and print formed on the print medium are shown with the line deformed and not tilted. When the boundary distance with the medium is small, the pattern may be lost when printing on an inclined printing medium. For example, a ceramic tile should have a square area printed on it. However, when the ceramic tile is tilted, it is formed into a parallelogram with a missing part. Both of these situations directly lead to waste generation and increase production costs. Significantly improves.

[0003] The prior art generally only adopts the method of artificial adjustment to overcome the above defects. Artificial adjustment is not only time-consuming, but also tends to reduce manufacturing efficiency and the accuracy of artificial adjustment. There is also a problem, and after adjustment, the pattern printing effect is still not good, and the pattern is incomplete. In addition, taking into consideration production safety and technical confidentiality, the product may The process of moving to the print head and starting printing can be relatively sealed, and manufacturing Since there is no room for artificial manipulation in the process, the above deficiencies can be eliminated by artificial adjustment. Therefore, it is not possible to print on an inclined printing medium. A method and system that can avoid the disadvantages of artificial adjustment and tilt A reduction pattern can also be printed on the print medium. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention overcomes at least one of the deficiencies of the prior art and provides a method for printing an inclined image using a print head. The present invention aims to provide a method and system for printing on a printing medium, which does not require any manual adjustment, It is possible to print on an inclined printing medium, and the pattern formed by printing is complete and variable. This reduces the possibility of producing defective products without forming new parts, while ensuring manufacturing efficiency and Processing and adjusting skewed print media takes too much time, reducing production efficiency This solves the problem. [Means for solving the problem]

[0005] The technical solution adopted in the present invention is a method of printing on an inclined printing medium using a print head. The first printing policy or the second printing policy is adopted, and the first printing policy is , the print medium moves relative to the print head at a speed V X The image is printed as it moves past the print head. The print head prints on the non-inclined print medium in a straight line perpendicular to the direction of movement of the print medium. A plurality of rows of printing dots are formed, and a plurality of ejection holes are formed in the print head in rows corresponding to the printing dots. The method is for determining the tilt of the tilted printing medium, including the tilt direction and tilt angle α relative to the moving direction. In step S1 of acquiring the state, the moving direction is the direction in which the printing medium moves relative to the print head. The direction of the tilt is the direction of the print head, i.e., the direction of the movement of the print medium. In other words, the position closest to the print head of the non-inclined printing medium is The edge of the printing medium is defined as an inclined edge, and the opposite edge is defined as a reference edge. When the distance changes in a direction perpendicular to the direction of the print medium, the print medium is tilted and the tilted edge moves toward the base. The direction of the current inclination is the direction in which the distance perpendicular to the printing medium movement is greater than the near end. There is virtually no external force interference during manufacturing, so there is generally no wobble or small bumps. The tilt is generally slight, and the rectangular print medium Take the conveyor belt as an example, that is, both sides of the conveyor belt are The first and second sides are arranged in a direction perpendicular to the direction of the conveyor belt. When the directions facing the two sides are the first direction and the second direction, respectively, the inclined edge of the printing medium is When the print medium is closest to the first side, the tilt direction of the print medium is the first direction. is any straight line parallel to the direction of movement of the printing medium in the case of an untilted printing medium, or The angle between the edge and the moving direction of the printing medium after tilting. If the printing medium has a rectangular structure, The side that is parallel to the direction of movement when not tilted and the side that is tilted are easily captured when tilted. Only the angle with the direction of movement after the tilt is required to be acquired. The acquisition of α can be achieved in a variety of ways, including complex image classification, convective ranging, etc. This includes providing a sensor to calculate the geometric relationship. The direction and angle of the tilt are obtained by The print head will then print with a specific print policy based on the tilt direction and tilt angle. and a step of acquiring the print start point Z0 of the tilted printing medium. That is, the print area of ​​the non-tilted print medium is reflected on the tilted print medium, and the print Step S2, in which the printing point closest to the print head in the printing area is the starting point Z0, The print head forms a pattern in the print area on the untilted print medium, so the print area is In order to have a basically matching effect after printing on the skewed print medium, a known skew The print area reflected on the tilted print medium is based on the print area distribution on the untilted print medium. It is necessary to obtain the print area and print media size of the same product without changing the basic Therefore, the printing area of ​​the tilted printing medium is calculated using a geometric relationship based on the tilt direction and tilt angle. The print area can be obtained by using the print head to find the area closest to the print head. Contributes to the acquisition of print point Z0, and as soon as the starting point Z0 enters the print head inkjet range Printing starts, but the start point Z0 is missed, some patterns are lost, or the printing area is shifted. The printing points are those produced by the inkjet print head. , belong to the virtual point before inkjet, and for the purpose of explanation, this specification is based on the printing point and the starting point is the print head reflected on the actual tilted print medium before inkjet printing. It is a single virtual point that is closest to the target and can be calculated and obtained by geometric relationships. For example, if you prepare a rectangular area for printing, the starting point will be after the rectangular area is tilted. Step S2 is the corner closest to the print head, and the print head starts printing from the starting point Z0. and continuously shifting parallel to the opposite side of the tilt in a direction perpendicular to the direction of movement of the tilted printing medium. During translation, one or more jets are fired in a direction parallel to the direction of travel of the tilted print medium. Step S3 of controlling the ink jet to retard the hole, said translation being The print head moves parallel to the print medium in a direction perpendicular to the print medium movement. The print head prints from the starting point, and the print area on the tilted print medium is tilted. Since the printing area of ​​the printing medium is tilted more than the printing area of ​​the printing medium, the printing medium is moved perpendicular to the starting point. The print head is moved in a direction corresponding to the printing area, and printing is performed on at least one side of the corresponding printing area. The movement in the opposite direction to the tilt direction may be a parallel movement of the print head in a direction opposite to the tilt direction. However, the pattern is deformed by a single translation, for example A rectangular pattern is printed on a rectangular, un-tilted print medium, and after the print medium is tilted The image is then translated to the inclined printing medium, and one side of the printing area is printed. The pattern is represented as a parallelogram with a missing part on a rectangular printing medium. The print dots in each row formed by printing on a non-tilted print medium are deformed and not perfect. However, when the printing medium is tilted, the printing points of each row to be formed correspondingly are also substantially tilted, i.e., The distance between the print points in the same row and the print head in the moving direction is equal, but after tilting The distance between the printing points in the same row and the print head in the moving direction gradually increases in the inclined direction. In this case, ink is simultaneously jetted from a row of nozzles to form a row of prints. This problem cannot be solved by adopting the conventional method of forming a printing spot, but by using one or more The ink jetting holes are delayed in a direction parallel to the direction of movement of the printing medium. This problem can be solved by controlling the tilt angle and the reflected printing area. By providing one or more injection holes and ink-jetting with delay, the inclined lines are formed. It is possible to form slanted printing points, which correspond to the slanted printing medium. Step S3 restores the effect of printing on a non-printing medium and printing the complete pattern at an angle. The print heads are parallel to each other until the pattern is formed on the medium, and the pattern is tilted and distorted by the print medium. In step S4, the print head prints from the starting point and then moves the print medium. The nozzles move in parallel in a direction perpendicular to the direction of the axis of the nozzle. Since the ink jets are delayed, it is possible to print an inclined print area. When you print on a print medium, you get the same effect as printing on a non-tilted print medium. This allows the pattern to be printed without being tilted or distorted by the printing medium. The ink jets create multiple rows of tilted print points, so the nozzles never go blank. and step S4 of essentially presenting the complete pattern on an inclined print medium.

[0006] According to the method, during prior art manufacturing, the print medium is tilted before printing to form the product. Not only can it overcome the problem of not being able to print on tilted printing media, but it can also be used for printing on tilted printing media. It can essentially restore patterns that are not printed, without the need for manual adjustment of the printing medium. This method ensures production efficiency and reduces the possibility of defective products. According to the company, there is no need for a complex mechanical structure, and the response speed of the print head is guaranteed, and the ink is precisely It can reach the jet control, avoiding taking up a large space, and can be used in various manufacturing environments. At the same time, during the manufacturing process, the inclination is generally small. Therefore, each nozzle that prints on a non-tilted print medium and a nozzle that prints on a tilted print medium can be expressed as Even if the nozzle where the nozzle is printed is the same nozzle, if there is an error in the printing, the nozzle will be completely deformed. It can basically restore the pattern that is not present, and the print head actually prints one line. The structure formed by this process is essentially one continuous linear structure, which visually appears as a pattern. The method reduces the errors that may exist, i.e., the method does not require the use of conventional printing techniques. By adjusting the head to the circuit control, printing on the tilted printing medium can be completed, solving the above problem. Costs can be further reduced.

[0007] Furthermore, a parallel movement drive device, a delay control device, and a control device are connected to the print head. The line movement drive translates the print head in a direction perpendicular to the direction of movement of the print medium. The delay control device controls the delayed ink jet of the nozzle of the print head. The control device controls at least a parallel movement drive device and a delay control device. It is used to issue commands to

[0008] Furthermore, the print medium moves relative to the print head at a velocity V X When it moves past the print head, It is printed at speed V in step S3. Y For tilted print media, tilted print media movement The print medium is continuously translated in the perpendicular direction to the tilted opposite side, and the tilted print medium is translated during translation. The multiple nozzles that form a line of printing dots approach the nozzles on the opposite side of the inclination. After that, ink is jetted to the other side with a delay of △t, and the ink is jetted onto the tilted printing medium. The plurality of nozzles that are jetted together to form the same row of print points on the corresponding non-tilted print medium are The ink is jetted sequentially from the nozzle closest to the diagonal opposite side to the nozzle closest to the inclined side with a delay of △t. The above V Y , Δt is set by α. One type of delayed inkjet method of the present invention is Ink jets are ejected sequentially with a delay of △t from the nozzle closest to the opposite side of the inclination to the nozzle closest to the inclined side. By doing so, the nozzles can be sequentially jetted in the corresponding rows, preventing the pattern from being deformed. The ink jets are ejected in the order with a delay of △t, and the ink jets are arranged from top to bottom in a row. For example, if the nozzles are numbered 1, 2, ..., N from top to bottom, the first nozzle is After the nozzle ink-jet at time T, the second nozzle ink-jet at time T+△t. , the Nth nozzle ejects ink at time T+(N-1)△t, and N nozzles eject ink. The ink jets form a line of tilted print dots. More importantly, the ink jets actually The distance the inkjet head moves and how far it extends in the opposite direction to the moving direction The print pattern is completely printed because it is determined by the angle after tilting the print medium. To prevent deformation, V Y , Δt is set by α.

[0009] JPEG0007804006000001.jpg138166

[0010] Furthermore, in order to simplify the device, the print head is arranged to print the same line of the printing medium without tilting. Alternatively, the printing may be performed on a tilted printing medium using a jetting hole that prints a plurality of printing points. The nozzle is different from the nozzle that prints on a non-inclined printing medium and is defined by the above formula. It is also possible to print on a slanted print medium according to the rules set forth above. Get the next row of printing points A1 and A2, and add up to V Y Calculate and set △t.

[0011] Furthermore, the print head may include multiple rows of nozzles with different pitches, or the print head may include nozzles with different pitches. The pitch between holes is adjustable to produce a line of print dots on an un-tilted print medium Among the multiple injection holes, the pitch between adjacent injection holes is set to L1, and printing is performed before step S3. The head prints the print point closest to the print head among the print points in the adjacent row on the tilted print medium. The time interval between injection holes is set as △T' = △Tcosα, and the injection hole pitch is selected. The pitch of L1'=V X Adjust as △T sinα + L1 cosα, and the △T is tilted. The distance between ink jets printing dots in adjacent rows on the print medium.

[0012] When printing on an inclined printing medium, the pitch L1 of the injection holes and the number of printing points per row are When the inkjet interval △T for the print points close to the head does not change, the tilt angle is small. When the tilt angle is large, no visually perceptible error occurs. In some cases, the position where printing is required may be between the two nozzles, and the upper or lower nozzle may be used. Printing this point with a hole can lead to visual errors in the edge position of the pattern In this case, the accuracy can be improved by increasing the accuracy in the direction of parallel movement of the print head. For example, the pitch of the nozzles can be reduced and the number of nozzles can be increased at the same time, and the printing width can be increased. This ensures accuracy and reduces errors caused by large tilt angles.

[0013] Furthermore, the print head may have multiple rows of ejection holes with different pitches L1 between adjacent ejection holes. Injection holes in one or more rows in which the pitch L1 between adjacent injection holes is adjustable are set in the same direction. The parallel movement direction of the print head in the direction of movement of the print medium of the equally inclined adjacent print points The problem of errors occurring due to imperfect correspondence between the pitch of the nozzle and the ink jet of the nozzle. This can overcome the problem of rectangular ceramic tiles that need to be completely covered by the pattern. For example, the print points in the first column are Col1, the print points in the second column are Col2, and the print points in the same column are Col3. From the print head closest to the print head to the print point furthest from the print head, the numbers are N1, N 2, ..., NN, the distance between Col1-N1 and Col2-N1 is l1, and the gradient The distance between the two points behind the tilt is l2, the tilt angle is α, and l1 = V X △T, and l1 and l 2 and the original print media are inkjet Col1-N1 aligned with the print head. The distance in the direction of movement of the printing medium from the position where Col2-N1 is printed is l1. After tilting, the print head inkjet to Col1-N1 and then moves parallel to Col2-N1. In this case, the distance in the direction of movement of the printing medium is l2cosα, and △T' V X =l2co Because of sα, △T'=△Tcosα, and the inkjet To achieve a highly accurate restoration pattern, one of the solutions is the Co When the nozzle corresponding to I1-N1 moves to Col2-N1 and ink-jet, At this time, the injection hole originally corresponding to Col1-N2 is delayed until this time and corresponds to Col1-N2. When inkjet is performed, the pitch L1' between adjacent injection holes is It must be equal to the distance between l2 and N1 in the direction of parallel movement of the print head. , and by geometrical relationship L1'=V X △T'tanα+L1cosα=V X △sinα+L1c osα can be calculated and obtained, and L1 is the value obtained when printing on a printing medium that is not tilted to the original. The line of printing dots is the pitch between adjacent ejection holes among the plurality of ejection holes. N1 is the starting point closest to the print head among the first row of print points closest to the print head .

[0014] Furthermore, the last row of the non-inclined printing medium in the skewed printing medium corresponds to Among the printing points, the printing point closest to the nozzle is set as the final reference point A1', and the same as the final reference point A1' The printing point in the row that is farthest from the final reference point is set as the end point A2', and in step S3, The head speed is V Y When printing by moving the print point to the corresponding row of the final reference point A1', Ink jetting from the final reference point A1', co-forming the printing points of the corresponding row of the final reference point A1' The remaining injection holes are jetted in order with a delay of △t from the corresponding injection hole at the final reference point A1'. The nozzle that is delayed until the end of printing corresponds to the end point A2'. Unless otherwise specified below, the line of print points on the tilted print medium is not tilted. The print points are the row of print holes that correspond to the print medium. That is, the nozzle holes that are closest to the inclined side of the print medium. The jet holes ink-jet first, and the remaining jet holes ink-jet later in sequence. The print head moves parallel at a constant speed until it starts printing the last row of print dots. , ensure that inkjet starts from the final reference point, and inkjet last with a delay The ink jet of the last row of tilted printing points corresponds to the ink jet of the last row of tilted printing points. Complete the process, complete the definition of the printing area from the start of printing to the completion of printing, and The distribution of the pattern printed on the inclined printing medium is compared with that of the non-inclined printing medium. The pattern distribution is the same as that of the body, ensuring the integrity and non-deformation of the pattern. The final reference point and the end point are both obtained by geometric calculation based on known data. For example, if the print area is rectangular, the final reference point and the end point can be actually The points are two corner points of the print media away from the print head, with a known tilt angle α, and the print area The size and distribution can be easily calculated and obtained, and therefore the parallel movement speed of the print head and Δt can be easily calculated and finally the inkjet delay from the final reference point is calculated. The ink jetting is performed in the order of delay until the end point. , the other nozzles are delayed one by one from the final reference point to the other end of the final reference point. This means that it is then inkjet printed.

[0015] Furthermore, in step S3, the print head first prints the corresponding inclination of the start point Z0 before the print start point Z0. The ink jet moves to the nozzle that ink-jet prints on the print point of the non-skewed print medium, and This corresponds to the starting point Z0 of the print media tilted in this direction. Generally, the pattern has a variety of colors, so the same printing effect and To achieve this correspondence, the starting point and the corresponding point on the non-tilted printing medium are jetted. The nozzles can be made identical, so that ink jetting can be performed later based on the same nozzles. This contributes to reducing the complexity of the operation, and also reduces the position change caused by tilted printing media. Therefore, first move the print head to the corresponding nozzle and match it with the starting point and movement direction. After the print medium enters the print area, printing starts immediately and the print area is temporarily adjusted to Z0. This contributes to improving printing efficiency by avoiding the need for a long time and making full use of the gap time.

[0016] Furthermore, the print points of each row reflected on the tilted print medium that are closest to the print head are is set as the reference point A1, and in step S3, the speed of the print head V Y While moving at the reference point A1, The ink jet nozzles that ink jet onto the printing points of the non-tilted printing medium are paired with the reference point A1. That is, during the process of forming multiple rows of printing points by translating, each row of printing points is Printing starts from the printing point closest to the head, preventing printing omissions and ensuring accurate printing on one side of the printing area boundary. The boundary can be used to easily provide a reference for other nozzle ink jets, and boundary patterns can be easily This not only ensures the integrity of the turn but also contributes to reducing the difficulty of execution, making it easier for other injection holes to be inserted. By following certain rules, printing of the entire printing area can be completed.

[0017] Furthermore, the print medium is placed on a conveyor belt and moves relative to the print head at a speed V X to move and The print head includes a tilt detector for detecting the tilt state of the print medium, and at least a print starter. A printing point positioning device for obtaining the starting point, and a tilting device for determining the starting point at a certain time or at a certain time before printing. A distance sensor is further connected to sense the position of the print medium relative to the print head. The tilt detection device is realized using a conventional tilt measurement sensor. and the printing point positioning device includes a calculation module and a distance measurement module. It may be an image recognition device, and the tilt direction, tilt angle, and known print area may be used. By detecting the distribution of the non-tilted printing medium and applying geometric operations, the starting point Z0 The distance sensor measures the distance between the print medium and the print head. Therefore, V X The print head moves in the direction of the print medium based on the In this case, it is easy to calculate the time from which to inkjet downwards, assuming that it is aligned with Z0. This contributes to improving printing accuracy by accurately grasping the ink jet.

[0018] Furthermore, the printing medium is a ceramic tile. When applied to the production line, it can avoid the generation of many discarded boards, and This contributes to reducing losses and at the same time, it can automatically realize tilt printing of ceramic tiles. This eliminates the need for human intervention and allows the ceramic tiles to be manufactured in a relatively sealed environment. This contributes to separating the whole production line and eliminating interference factors during the production of ceramic tiles. less and the quality of the produced ceramic tiles is better.

[0019] Furthermore, in step S2, the inclination angle α of the inclined printing medium and the inclination angle α of the known printing area are calculated. Obtain the Z0 point reflected on the tilted print medium based on the distance to the print medium boundary. At the same time, the Z1 point, which is the printing point that belongs to the same column as the Z0 point and is the furthest from the Z0 point, is also taken. Rather than obtaining the printing points of other rows on the printing medium, the Z0 point and Z1 point are actually obtained by The two corner points of the print area of ​​the known print area are the distribution on the untilted print medium. and thus the print head movement and nozzle ink jet policy. Conveniently calculate and set.

[0020] Furthermore, among the multiple printing points reflected on the tilted printing medium, the direction of parallel movement of the print head The distance between the two farthest printing points is D, and the tilt angle of the tilted printing medium is By being equal to or smaller than the predetermined angle, the D is set to a plane of at least one row of injection holes of the print head. D is the width of a row of nozzles perpendicular to the direction of movement of the printing medium. If it is larger than , it may cause printing errors, so the size of D should be set to the average value of one row of nozzles. It must not be larger than the width in the line movement direction. For example, in the above print rectangular area, The D is d1+ω. The print head includes a plurality of nozzles, and the nozzles are provided with ejection holes. The plurality of nozzles and corresponding orifices form one or more rows of orifices in the print head. Furthermore, the print head is translated based on the width required to print on a non-tilted print medium. At least one nozzle is provided at each end in the moving direction, i.e., at least one nozzle is provided at each end. The nozzle width is set to be used when printing on an inclined printing medium, and a rectangular pattern is used as an example. Then, after the printing medium is tilted, d1 = length of the corresponding side of the printing area Z0 × sin α is obtained as follows: It should be smaller than the width of one nozzle, and the print head consists of 1536 nozzles. When the nozzles are arranged in a direction perpendicular to the direction of movement of the printing medium, the width of the 1,536 nozzles is 70 mm, That is, the tilt angle of the tilted printing medium should be smaller than a predetermined angle, and d1≦70m Set it to m.

[0021] Furthermore, the print area of ​​the non-inclined print medium is moved in the direction of the print head. The width is equal to or greater than the width of one side away from the print head. The middle width of the print area is greater than the width of both sides. In comparison with the above, controlling the nozzle holes of the print head is simple, which contributes to simplifying the control circuit. They are rectangular, square, and trapezoidal, narrowing away from the print head.

[0022] Furthermore, the print medium is a rectangular print medium. In this case, the distribution of the printed area reflected on the tilted printing medium is calculated based on the regular printing medium. It contributes to the acquisition of a simple distance measurement method when the print area covers the entire print medium. The computer simply performs geometric calculations to obtain the tilt angle and tilt direction of the printing medium. Cut.

[0023] Furthermore, the print area on a non-skewed print medium is a rectangular print area. Easily match the distance between the print medium boundary and the slanted print medium to obtain the distribution reflected on the slanted print medium. do.

[0024] The second printing policy includes the tilt angle of the printing medium and the printing standard after tilting. and adjusting the print content based on the tilt angle and the position of the print reference point. The print content and the print medium are mirror-symmetrical, and the print reference point is aligned with the print head. When the print content is transmitted, the print head starts printing on the print medium based on the print content. Control the signal so that it is

[0025] During normal transport of the print media, as it is transported to the print head, the print head A pattern or color is formed on the printing medium based on the specified printing content, and the printing content is generally When the print medium is tilted, the print content is must be adjusted accordingly to ensure that the print media is printed correctly and the print performance is There is no missing or distorted turn. The print content can be adjusted by adjusting the tilt of the print media. The print head is then moved to the print head. The tilt angle and the printing reference point must be obtained. The printing content can be adjusted based on the angle of inclination. After rotation, this printing reference point is used as the reference point for the adjustment position, and the printing content is adjusted to the corresponding position of the printing reference point. The position is adjusted to make the print media and the print content mirror-symmetrical, and the print media reaches the print head. The print head prints on the print medium based on the adjusted print content, and the tilted print medium The method provided in this embodiment can be used to complete printing by calculation or measurement. When the tilt state of the print medium is acquired, the print content is adjusted to correspond to the tilted print medium. Therefore, printing on a tilted printing medium can be completed smoothly, and the overall adjustment The process is not manually adjusted, making it highly efficient and low cost.

[0026] Furthermore, the tilt angle is an included angle formed between one side of the printing medium and a reference line, and the tilt angle The side of the printing medium corresponding to the degree is an included corner side of the printing medium, and the reference line is A straight line parallel to the direction of travel of the print medium, specifying the inclination angle of the print medium, and Specifically, when the condition Sc1 is satisfied, the distance from the points D2 and D3 on the reference line to the printing medium Measure the vertical distances y2 and y3 to the included corners of the body, respectively, and the abscissa x2 of point D2, The tilt angle of the printing medium is determined based on the abscissa x3 of the marking point D3, the y2, and the y3. do.

[0027] The tilt angle of the printing medium is determined by the angle formed between a reference line and one side of the printing medium. The reference line may be a straight line parallel to the direction in which the print medium is transported, and this inclination The specific method of determining the angle is as follows: when condition Sc1 is triggered, the point on the reference line Measure the perpendicular distances y2 and y3 of the included corners from D2 and D3 to the printing medium, and The vertical reference line and the included corner of the printing medium have two intersections with 3 as the end point, and these two intersections are Generally, the two end points of the included angle are not the two end points, but the perpendicular distances y2 and y3 measured. By combining the abscissa x2 of point D1 and the abscissa x3 of point D3, we can obtain the coordinates of the intersection of these two points. The inclination angle of the printing medium can be obtained based on the coordinates of these two intersection points. .

[0028] Furthermore, the condition Sc1 is that the horizontal coordinate of the printing reference point is x1, and the printing medium The shape of the body is rectangular, and the position of the printing reference point at which the printing medium is tilted is identified, specifically: When the printing medium is tilted clockwise, the x1, x2, x3, y2, Based on the y3 and the length of the side of the printing medium perpendicular to the included angle side, Identify the position of the reference point, and when the printing medium is tilted counterclockwise, 2. Identify the position of the inclined printing reference point based on the x3, y2, and y3. .

[0029] When the trigger condition Sc1, which is the horizontal coordinate x1 of the printing reference point, is satisfied, determines the reference point for adjusting the print content, so to process slanted print media, the print reference point It is necessary to determine the horizontal and vertical coordinates of the printing reference point at a certain time. The horizontal coordinate of the printing reference point is known to be x1. When the printing medium is tilted clockwise, the abscissa x1, the abscissa x2 of point D2, and the abscissa x3 of point D3 x3, the perpendicular distance y2 from point D2 to the included angle side, the perpendicular distance y3 from point D3 to the included angle side, and The vertical coordinate of the printing reference point after tilting is determined based on the length of the side of the printing medium perpendicular to the included angle side. When the printing medium is tilted counterclockwise, the abscissa x1 and the abscissa of point D2 are x2, the abscissa of point D3 x3, the vertical distance y2 from point D2 to the included angle side, The vertical coordinate of the printing reference point after tilting can be determined based on the vertical distance y3 at

[0030] JPEG0007804006000002.jpg50166

[0031] JPEG0007804006000003.jpg59166

[0032] Another object of the present invention is to provide a first equipment module combination and / or a second equipment module combination. A system for printing on an inclined print medium using a print head including a print head combination is provided. do.

[0033] The first device module combination may be used to implement the first printing policy; The first device module combination is a print head, and the print medium is positioned relative to the print head. The ink is printed as it moves past a print head, and the print head is provided with a plurality of ejection holes. The plurality of ejection holes print and form a plurality of linear rows of print dots on the non-tilted printing medium. The tilt angle α of the print head and the tilted print medium relative to the direction of movement of the print medium is a tilt detection device for detecting a parameter reflecting the tilt state of the printing medium, and a print head a translation drive device for translating the print medium in a direction perpendicular to the direction of movement of the print head; a delay control device connected to the nozzle for controlling the delay ink jet of the nozzle of the print head; At least, obtain the printing point Z0 closest to the print head in the direction of movement of the tilted printing medium. a printing point positioning module for determining the inkjet starting point by the tilt detection device, The line movement drive unit is connected to the delay control unit, and the parallel movement drive unit controls the parallel movement of the print head. and a delay control device controls the ink jetting to one or more nozzles of the print head. and a control device that controls the jetting.

[0034] The control device responds to the data obtained by the tilt detection device and the print point positioning module. The parallel movement drive unit then starts ink jetting from the starting point and the print head tilts to the opposite side. At the same time, a delay control device controls the driving so that the printing A plurality of nozzles that print and form a line of print dots on a non-tilted print medium in the head. One or more of the nozzles are controlled to inkjet with a delay, resulting in tilted printing. The printing process continues until the complete pattern is printed on the tilted printing medium. Printing is performed while the print head is continuously moved in parallel, and the pattern is not deformed by tilting.

[0035] The tilt detection device includes an image recognition device or a distance measurement sensor, By calculating the geometric relationship, the tilt direction and angle can be obtained, for example: A rectangular print medium whose upper surface is completely covered with a pattern is obtained, and the distance measuring sensor measures the distance between the print medium Obtain the distance between the first time and the sensor on one side, and the distance between the second time and the sensor By adjusting the speed to match the speed of the print medium, the tilt direction and angle can be calculated and obtained. The tilt direction and angle are acquired so that the print head can later print a specific image based on the tilt direction and tilt angle. Contribute to printing with printing policies.

[0036] The print head forms a pattern in the print area on the untilted print medium, To achieve a basically matching effect after printing on a tilted print medium, a known tilt is used. Based on the distribution of print areas on a non-skewed print medium, the print areas reflected on the skewed print medium are It is necessary to obtain the area, and the printing area and printing media size of the same product basically change. Therefore, the printing area of ​​the tilted printing medium is determined by using a geometric relationship based on the tilt direction and tilt angle. The print area can be obtained by the print head's closest print area. This contributes to obtaining a new print point Z0, and as soon as the starting point Z0 is within the print head ink jet range Printing starts at the start point Z0, some patterns are lost, or the printing area is shifted. This helps prevent the situation, and the printing point positioning device obtains the starting point Z0 in this way. The printing points are points by the print head inkjet, and are virtual points before inkjet. The present specification is by way of printing points for the purposes of illustration, and the starting point is the One virtual printhead closest to the printhead reflected on the actual tilted print media before the ink jet. It is a point of interest and can be calculated and obtained by geometric relationships, for example, a printing rectangle area. When a rectangular area is prepared, the starting point is set to a corner point close to the print head after the rectangular area is tilted. The parallel movement controlled by the parallel movement drive device is a movement of the print head relative to the print medium. A translation in a direction perpendicular to the print medium movement, where the print head prints from a starting point, When tilted, the print area on the tilted print medium is larger than the print area on the non-tilted print medium. To tilt, the print head is moved from the starting point in a direction perpendicular to the movement of the print medium. and printing can be performed on at least one side of the corresponding printing area, The movement is a parallel movement of the print head in the direction opposite to the tilt direction, but it is not a separate parallel movement. The row shift causes the pattern to be distorted, e.g., the original rectangular, non-tilted printing medium A rectangular pattern is printed on the body, and the print medium is tilted and then translated to create a tilted print medium. The pattern formed by printing is a rectangular print. It appears as a parallelogram with a missing part in the medium, and the pattern is distorted and incomplete. When the printing medium is tilted, the printing dots formed in each row by printing on the non-tilted printing medium are Each row of print points to be formed is also substantially tilted, i.e., the print points and print head of the same row are originally tilted. The distance between the print head and the print points in the same row is equal, but after tilting, The distance between the two in the direction of movement gradually increases in the direction of inclination. The conventional method of forming a line of printing dots by simultaneously ink-jetting a line of nozzles is adopted. Although it is not possible to solve the leverage problem, it is possible to fix one or more nozzles parallel to the direction of print medium movement. This problem can be solved by controlling the ink jetting in a delayed manner in the direction of the ink jet. Depending on the tilt angle and the reflected printing area, one or more injection holes can be provided to delay By ink-jetting the ink in a row, it is possible to form inclined print dots in a row. This allows you to reproduce the effect of printing on a non-tilted printing medium in a way that corresponds exactly to the tilted printing medium. To restore.

[0037] The print head prints from a starting point and then continues in a direction perpendicular to the direction of movement of the print medium. The nozzles move in parallel continuously, and the nozzles ink-jet one by one with a delay according to the parallel movement. So you can print a slanted print area and correspond to the slanted print medium, basically This achieves the same effect as printing on a non-inclined printing medium, and the pattern is printed on the printing medium. During the printing process, the delayed inkjet prints multiple rows of tilted ink. Since the printing points are slanted, the nozzle holes are not empty and the complete pattern can be printed. Presented on tilted print media.

[0038] Furthermore, the print medium moves relative to the print head at a velocity V X When it moves past the print head, The printhead is then moved at a speed V Y for tilted print media The print medium is controlled to move continuously in parallel in the direction perpendicular to the tilted direction. The delay control device controls at least a plurality of jets forming a line of printing points on the print head. The nozzles at one end ink-jet, and then ink-jet to the nozzles at the other end with a delay of △t. The plurality of jetting holes that form a line of print points on the tilted print medium are arranged on the opposite side of the tilt. The nozzle at the end closest to the ink jet then injects ink to the nozzle at the other end with a delay of △t. and ink-jet printing, Y , Δt is set by α.

[0039] JPEG0007804006000004.jpg34166

[0040] Furthermore, in order to simplify the device, the print head is arranged to print the same line of the printing medium without tilting. Alternatively, the printing may be performed on a tilted printing medium using a jetting hole that prints a plurality of printing points. The nozzle is different from the nozzle that prints on a non-inclined printing medium and is defined by the above formula. It is also possible to print on a slanted print medium according to the rules set forth above. Get the A1 and A2 points in the next row, and V Y Calculate and set △t.

[0041] Furthermore, the print head may include multiple rows of nozzles with different pitches, or the print head may include nozzles with different pitches. The pitch between holes is adjustable to produce a line of print dots on an un-tilted print medium Among the plurality of injection holes, the pitch between adjacent injection holes is set to L1, and the control device The print head is tilted according to the data acquired by the ejection device and the print point positioning module. The time interval between printing the print dots closest to the print head among the print dots in the adjacent rows on the print medium is Set △T' = △Tcosα, select the injection hole pitch or set the injection hole pitch to L1 '=V X Adjusted as △T sinα + L1 cosα, where △T is the thickness of the untilted printing medium is the ink jet spacing between adjacent rows of print dots.

[0042] Furthermore, the printing point positioning module detects the known printing point according to the detection data of the tilt detection device. Printhead for tilted print media to match the distribution of areas on non-tilted print media For example, the tilt detection device detects the point closest to the point where the distance suddenly changes. The first time, the second and third times can be obtained as the distance changes continuously. is the time when the printing medium reaches the position of the tilt detection device, and the distance measurement results at the second and third times are time interval, and V X By combining these, the tilt angle and tilt direction can be obtained. The printing point positioning device calculates the movement distance of the printing medium from the first time to the third time, and calculates the inclination. The tilt is calculated by combining the detection data of the detector and the distribution of the print area on the untilted print medium. Calculate the print area reflected on the skewed print medium to obtain the inkjet starting point Z0 The distribution of the printing area on the non-inclined printing medium is Includes the distance.

[0043] Furthermore, the control device controls the parallel movement according to the data acquired by the printing point positioning module. The print head is controlled by the drive unit to move until it corresponds to the starting point. The printing point is the closest to the print head, and since the pattern generally has many different colors, it is tilted. To achieve the same printing effect and correspondence as on a non-tilted print medium, the starting point and the non-tilted Therefore, the same ejection holes can be used at the same points on the printing medium. Inkjet based on holes contributes to reducing the complexity of operation. Since the position of the print medium may change, the present invention is After obtaining the starting point, the print head is translated to the corresponding nozzle by the translation drive device. , driven to correspond to the starting point in the movement direction, and after the printing medium moves into the printing range Start printing immediately, avoiding the need to temporarily adjust to Z0, and make full use of the gap time. This contributes to improving printing efficiency.

[0044] Furthermore, the print points on the skewed print medium that correspond to the last row of the non-skewed print medium The printing point closest to the nozzle is set as the final reference point A1', and the The printing point farthest from the final reference point is set as the end point A2', and the printing point positioning module is The final reference point A1' and the end point A2' are acquired, and the control device controls the print head to move at a speed V Y Move with When printing the corresponding row of print points of the final reference point A1', The remaining nozzles that ink-jet and form the corresponding row of printing points of the final reference point A1' are Ink jets are jetted sequentially from the corresponding nozzle at the final reference point A1' with a delay of △t, and before printing is completed The jet hole that ink-jetted with the last delay corresponds to the end point A2'. If there is no tilt, a line of print points on the tilted print medium will correspond to a line of print points on a non-tilted print medium. In other words, the nozzles closest to the inclined side of the nozzle line print ink first. The remaining nozzles jet ink in a sequentially delayed manner. When moving parallel at a constant speed until the last row of printing points starts to print, The nozzles are designed to ensure that the ink jet starts at the beginning, then the nozzles are designed to ink jet at the end with a delay. The printing points correspond to each other, thus completing the inkjet of the last row of inclined printing points, and printing begins. Completely limit the printing area from start to finish, and print on tilted printing media The distribution of the pattern on the tilted printing medium is compared with the pattern on the non-tilted printing medium. The distribution of the final reference point and the Both the starting point and the end point can be obtained by fitting geometric calculations to known data. For example, when the printing area is rectangular, the final reference point and the end point are actually the same as the print on the printing medium. Two corner points away from the print head, with a known inclination angle α, print area size and distribution. Therefore, the parallel movement speed of the print head and Δt can be easily calculated. Then, ink is jetted from the final reference point, and then ink is jetted with a delay to finish. The ink-jet operation is delayed in order so that the other nozzles are the first to be ejected. Ink jets are ejected from the final reference point and then to the other end of the final reference point with a delay. This means that...

[0045] Additionally, the print point location module may be configured to determine the print area on a known, unskewed print medium. distribution of, and V X Based on this, the print head prints the print points of each row on the inclined print medium. The control device calculates and acquires the printing point closest to the reference point A1, and the print head moves at a speed V Y While controlling the parallel movement of the reference point A1, the printing of the corresponding non-tilted printing medium The nozzles that ink-jet the ink at the point correspond to the reference point A1 one-to-one. During the process of forming multiple rows of printing dots, printing is performed starting from the printing dot closest to the print head in each row. This prevents printing omissions and achieves accurate printing on one side of the printing area, and the other side can be printed using the border. Simply provide a reference for the nozzle inkjet and ensure the integrity of the boundary pattern. Rather, it contributes to reducing the difficulty of implementation, and if other injection holes follow certain rules, the overall marking The printing of the printing area can be completed.

[0046] The tilt detection device further comprises one or more convective distance sensors disposed in the direction of print medium movement. The convection distance measurement sensor can easily detect the tilt direction and tilt angle. , contributes to detecting the print medium position in real time, and sends the data to the print point positioning module. For example, the print media moves until it occludes the convective distance measurement sensor. In this case, the tilt direction, tilt angle, and known non-tilted mark are detected and acquired later. Print area distribution of printing media and V X The printing point positioning module calculates and starts The starting point Z0 can be located. Furthermore, the printing medium is a ceramic tile.

[0047] Furthermore, the printing point positioning module is configured to determine the starting point Z0, the nearest point from the starting point belonging to the same column. Obtain the distance between the two printing points Z1 and Z2. The data is then acquired to facilitate the calculation of the printing point positioning module. Rather than obtaining the points, the Z0 and Z1 points are actually the two corner points of the printing area of ​​the printing medium, and are known The print area distribution on the non-tilted print medium is easily obtained, and thus the print area distribution is easily obtained. The policies of the brush head movement and nozzle ink jetting are calculated and set conveniently.

[0048] Furthermore, among the multiple printing points reflected on the tilted printing medium, the direction of parallel movement of the print head The distance between the two farthest printing points is D, and the tilt angle of the tilted printing medium is By being equal to or smaller than the predetermined angle, the D is set to a plane of at least one row of injection holes of the print head. D is the width of a row of nozzles perpendicular to the direction of movement of the printing medium. If it is larger than , it may cause printing errors, so the size of D should be set to the average value of one row of nozzles. It must not be larger than the width in the line movement direction. For example, in the above print rectangular area, The D is d1+ω. The print head includes a plurality of nozzles, and the nozzles are provided with ejection holes. The plurality of nozzles and corresponding orifices form one or more rows of orifices in the print head. Furthermore, the print head is translated based on the width required to print on a non-tilted print medium. At least one nozzle is provided at each end in the moving direction, i.e., at least one nozzle is provided at each end. The nozzle width is set to be used when printing on an inclined printing medium, and a rectangular pattern is used as an example. Then, after the printing medium is tilted, d1 = length of the corresponding side of the printing area Z0 × sin α is obtained as follows: It should be smaller than the width of one nozzle, and the print head consists of 1536 nozzles. When the nozzles are arranged in a direction perpendicular to the direction of movement of the printing medium, the width of the 1,536 nozzles is 70 mm, That is, the tilt angle of the tilted printing medium should be smaller than a predetermined angle, and d1≦70m Set it to m.

[0049] Furthermore, the print area of ​​the non-inclined print medium is moved in the direction of the print head. The width of the printing medium is equal to or greater than the width of one side away from the print head. Furthermore, the print area on a non-tilted print medium is a rectangular print area.

[0050] Furthermore, the system is connected to a control device and is configured to determine the tilt at a certain time or at a certain time before printing. a distance sensor for sensing the position of the print medium relative to the print head; The sensor can provide feedback on the distance between the print medium and the print head, thus V XBased on this, when is the print head aligned with Z0 in the direction of movement of the print medium? Easily calculate the inkjet down, accurately grasp the inkjet, and print precision This contributes to improving the quality of life.

[0051] The second device module combination may be used to implement the second printing policy; and the second equipment module combination includes a control module and a data processing module; The data processing module determines the tilt angle of the printing medium and the position of the printing reference point after tilting. The control module is for identifying the The printing content is adjusted based on the tilt angle and the position of the printing reference point. The control module is for mirroring the content and the print medium. When the print reference point is transmitted to the print head, the print head moves forward with respect to the print content. This is for controlling the start of printing on the print medium.

[0052] During normal transport of the print media, the control module of the system The print head prints a pattern or a mark on the print medium based on the preset print content. The color is controlled to form, and the printing content is generally a pattern or When the printing medium is tilted, the print content needs to be adjusted accordingly. The printing media is now printing normally, but the printing pattern is missing or distorted. does not occur.

[0053] The adjustment of the print content is determined by the tilt of the print media, so the print media Before being transferred to the head, the data processing module of the system determines whether the print medium is tilted or not. The tilt angle and printing reference point must be obtained, and the Generally, the data processing module first determines the tilt angle. Based on this, the printing medium is rotated by the same angle, and then this printing reference point is adjusted to the reference point of the adjustment position. The print content is adjusted to the corresponding position of the print reference point, and the print medium and the print content are mirrored. When the print media reaches the print head, the print head adjusts based on the adjusted print content. It can control printing on the printing medium and complete printing on the inclined printing medium. The system provided in this embodiment is printed by calculation or measurement of the data processing module. When the tilt state of the printing medium is acquired, the control module adjusts the printing contents to correct the tilt. It can accommodate the printing medium, so that the printing on the inclined printing medium can be completed smoothly, and the overall The adjustment process is not manual, making it highly efficient and low cost.

[0054] Furthermore, the tilt angle is an included angle formed between one side of the printing medium and a reference line, and the tilt angle The corresponding side of the printing medium is an included corner side of the printing medium, and the reference line is The medium is a straight line parallel to the direction of transmission, and the data processing module is a data calculation a data processing module and a data detection measurement module, To identify the tilt angle of the printing medium, specifically, the data detection and measurement module The rule detects whether or not the condition Sc1 is satisfied, and if the condition Sc1 is satisfied, The vertical distances y2 and y3 from points D2 and D3 on the reference line to the included corner edges of the printing medium and the data calculation module is for measuring the coordinates of the point D2. The inclination of the printing medium is calculated based on the target x2, the abscissa x3 of the point D3, the y2 and the y3. It is used to identify angles.

[0055] Furthermore, the condition Sc1 is that the horizontal coordinate of the printing reference point is x1, and the printing medium The shape of the printing medium is rectangular, and the data processing module is Specifically, the data calculation module is for determining the position of the printing medium. When the body tilts clockwise, the x1, x2, x3, y2, y3, and the position of the printing reference point after tilting based on the length of the side of the printing medium perpendicular to the included angle side. When the print medium is tilted counterclockwise, the x1, x2, and x3 coordinates are determined. 3. To identify the position of the printing reference point after tilting based on the y2 and y3. is.

[0056] Further, the data detection measurement module includes an occlusion sensor, a first distance sensor, and a second distance sensor. The data detection and measurement module detects whether the condition Sc1 is satisfied. When the condition Sc1 is satisfied, the distance from the points D2 and D3 on the reference line to the front is for measuring the vertical distances y2 and y3 to the included corner edges of the print medium, respectively; Specifically, the occlusion sensor is for detecting whether the condition Sc1 is satisfied. The first distance sensor determines that the condition Sc1 is satisfied by the occlusion sensor. When the reference line is set, the vertical distance y from point D2 on the reference line to the included corner side of the printing medium is 2, and the second distance sensor is for measuring the distance measured by the occlusion sensor. When it is determined that the condition Sc1 is satisfied, the distance from the point D3 on the reference line to the printing medium This is to measure the vertical distance y3 to the included angle side.

[0057] Each data detection measurement module can be served by three sensors. , the occlusion sensor is for detecting whether the condition Sc1 is satisfied, and the occlusion sensor - is set at the position of the abscissa x1 on the reference line, and the article appears on the straight line of the abscissa x1 If the printing reference point occludes the line of the horizontal coordinate x1, the occlusion sensor detects whether the printing reference point occludes the line of the horizontal coordinate x1. It is detected that the point is blocked, and it can be determined that the condition Sc1 is satisfied. Then, point D2 and point D The distance measurement from 3 to the included corner side is completed by two distance sensors respectively, the first distance The sensor is provided at the abscissa x2 on the reference line, i.e., at the point D2, and the second distance sensor The sensor is set at the abscissa x3 on the reference line, i.e., at the point D3. If the condition Sc1 is satisfied, the two distance sensors Measure the vertical distances y2 and y3 and align the abscissas of the respective sensors to the measured data. By doing so, the exact horizontal and vertical coordinates of the printing reference point can be obtained.

[0058] JPEG0007804006000005.jpg139166

[0059] The beneficial effects of the present invention over the prior art include the ability to print on tilted print media with a print polymer. The sheet can be automatically adjusted, so even if the print media is skewed, the sheet can be It can basically reproduce the same printing effect as unprinted media, and it can also be used for printing with imperfect patterns. This avoids the generation of many defective products due to deformation of the mold, and makes full use of conventional materials. Compared to the artificial adjustment in the conventional technology, the production efficiency is significantly improved. This allows the machine to be easily moved forward without wasting production time due to artificial interference. At the same time, the present invention does not require any modification of the machine structure. To achieve the corresponding function using a conventional print head without changing the print head. This avoids the complexity of redesigning the printhead and allows for multi-row or variable pitch printheads. It can be used to achieve more accurate printing and ensure the pattern is basically restored. On the premise that the quality of the pattern printed on the inclined printing medium is further improved. For quick calculation and application to regular size products such as ceramic tiles. This not only facilitates simplification but also facilitates independence of the manufacturing process of the type of print media in question, In the manufacturing process, it is not subject to other interference factors, such as the conventional artificial interference of the prior art. In particular, the second printing policy of the present invention improves the quality of the finished product. For each rule combination, the tilt state of the printing medium is obtained by calculation or measurement. By adjusting the printing content accordingly, printing on tilted printing media can be completed smoothly. The entire adjustment process is not manual, which is highly efficient and low cost. [Brief explanation of the drawings]

[0060] [Figure 1] FIG. 1 is a schematic diagram showing printing on a non-inclined printing medium according to first and second embodiments of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing printing on an inclined printing medium according to the first and second embodiments of the present invention. [Figure 3] FIG. 3 is a schematic diagram showing printing on a non-inclined printing medium according to the first and second embodiments of the present invention. [Figure 4] FIG. 4 is a schematic diagram (1) of printing on an inclined printing medium according to the first and second embodiments of the present invention. [Figure 5]FIG. 5 is a schematic diagram (II) of printing on an inclined printing medium according to the first and second embodiments of the present invention. [Figure 6] FIG. 6 is a schematic diagram showing the geometric relationship of print points before and after the print medium is tilted in the first and second embodiments of the present invention. [Figure 7] FIG. 7 is a schematic diagram showing the overall structure of a printing system according to a third embodiment of the present invention. [Figure 8] FIG. 8 is a structural schematic diagram of a printing medium according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram showing the overall structure of a printing system according to a fourth embodiment of the present invention. [Figure 10] FIG. 10 is a structural schematic diagram of a printing medium according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0061] The drawings are for illustrative purposes only and should not be construed as limiting the invention. In order to better illustrate the following embodiments, some elements in the drawings may be omitted, scaled, or reduced in size. The dimensions of the drawings may be different from those shown in the drawings and may not represent the actual dimensions of the product. Some known structures and their descriptions may be omitted.

[0062] Example 1 As shown in FIGS. 1 and 2, this embodiment uses a print head to print on an inclined print medium. The method is disclosed, in which a print medium 1 is placed on a conveyor belt 2 and is moved relative to a print head 3 at a speed V X in The print head 3 is not tilted and is printed as it moves past the print head 3. A plurality of linear rows of printing dots are formed on the medium perpendicular to the direction of movement of the printing medium, and the printing head 3 The nozzles are provided with rows of nozzles corresponding to the printing points, and the printing points are substantially inclined. When reflected on the print medium, it becomes the reserved inkjet position, and for convenience in this embodiment, it is represented by a dot circle. The print head is equipped with a tilt detection device 4, a parallel movement drive device 5, a delay control device 6, and a control The parallel movement driving device 5 is connected to the print head 3 and the distance sensor 8. The delay control device 6 drives the body 1 to move in a direction perpendicular to the moving direction of the body 1. The control device 7 controls the delayed ink jet of the nozzle of the ink jet head 3. The control device 7 includes a printing point positioning module that includes a printing point positioning device. is for issuing commands to control the parallel movement drive device 5 and the delay control device 6.

[0063] Specifically, in this embodiment, the printing medium 1 is a rectangular ceramic tile, and the entire printing area is The upper surface of the ceramic tile 1 is the upper surface of the ceramic tile 1, and the method includes the following steps.

[0064] S1: The tilt detection device 4 detects the tilt direction and tilt of the tilted printing medium 1 relative to the moving direction. The angle α is obtained, and as shown in Figure 2, the tilt direction includes the first direction and the second direction, and in the figure, (+ ) represents the first direction, and (-) represents the second direction. Specifically, in this embodiment, the inclination angle α is 15 ° or less.

[0065] S2: Inclined print media 1 that is not inclined according to the size of a known ceramic tile The print area reflected on the print medium 1 is acquired, and the print head 3 is located closest to the print area. The printing point is set as the starting point Z0, and the starting point Z0 is set by the printing point positioning module of the control device 7. The print head 3 obtains the corresponding print start point Z0 before the print start point Z0, as shown in Figure 2. The ink jet head moves to the nozzle N1, which ink-jet prints on the printing point of the non-tilted printing medium 1. This corresponds to the print medium starting point Z0 inclined in the movement direction.

[0066] S3: The distance sensor 8 calculates the time it takes for the print media to reach the print head 3, and Printing is performed from the start point Z0 on the printer 3 at a predetermined speed V Y tilted print media Continuous translation of the tilted print medium in a direction perpendicular to the print medium movement to the opposite side of the tilt However, as shown in FIG. 2, in this embodiment, when the print medium is tilted in the first direction, the print head It translates in a second direction opposite to the first direction and ink-jet prints onto the tilted print medium while moving. The plurality of nozzles that form the same row of print points corresponding to the non-tilted print medium are The ink is jetted sequentially from the nozzle closest to the opposite side to the nozzle closest to the inclined side with a delay of △t. For the sake of clarity, as shown in FIG. 4, when printing and forming the first row of printing dot patterns, N1 After ink-jetting at time T, the nozzles ink-jet sequentially with a delay. The first nozzle ejects ink at time T+△t, and the third nozzle ejects ink at time T+2△t. The Δt is the time interval for ink jetting to occur later than the previous injection hole.

[0067] The print point closest to the print head among the print points in each row reflected on the tilted print medium is used as the reference. The reference point in the last row is the final reference point A1', and the reference point in the same row as the final reference point A1' is The printing point farthest from the final reference point is the end point A2', and Y , △t is set by α As shown in FIG. 3, in this embodiment, at least the following conditions are satisfied, and the speed of the print head is V Y During the movement of the inkjet, the reference point A1 is aligned with the corresponding non-tilted print point on the print medium. The nozzles and the reference point A1 correspond to each other, realizing a precise printing process. The head speed is V YWhen moving and printing the corresponding row of printing points of the final reference point A1', the final Ink jetting from the reference point A1', other jetting holes of the printing point corresponding to the final reference point A1' Co-formed and ink-jetted from the corresponding injection hole of the final reference point A1' with a delay of △t, and The end point A2' corresponds to the jetting hole that ink-jet is delayed until the end before printing is completed.

[0068] JPEG0007804006000006.jpg49165

[0069] S4: A complete pattern is formed on a tilted printing medium, and the pattern is tilted by the printing medium. Does not tilt or deform.

[0070] The same arrangement of nozzles is used to print on the non-tilted printing medium. In addition to printing, the print head in this embodiment includes multiple rows of nozzles with different pitches. Alternatively, the pitch between the nozzles of the print head can be adjusted (not shown) to produce a non-tilted print. The pitch between adjacent ejection holes among the plurality of ejection holes that form a line of printing dots on the printing medium is L 1, and before step S3, the print head is tilted, and the print points of the adjacent rows of the print medium are tilted. The time interval for printing the print point closest to the nozzle is set as △T' = △Tcosα. Select the pitch of the injection holes or set the pitch of the injection holes to L1'=V X △Tsinα+L1cosα and adjusting the ΔT of the ink jets of the adjacent rows of printing points printed on the non-inclined printing medium. The distance between the two points is the distance L1 and △T. As shown in Fig. 6, for the convenience of representation, only a small number of printing points are shown in Fig. 6, and the dotted printing points are Solid print points reflected on tilted print media. This method allows for untilted print The effect of printing on the medium can be more accurately reproduced.

[0071] Example 2 As shown in FIGS. 1 and 2, this embodiment uses a print head to print on an inclined print medium. The system is shown in Fig. 1. The print medium 1 is placed on a conveyor belt 2 and is moved relative to the print head 3 at a speed V X The print head 3 is not tilted. A printing method in which multiple lines of equally spaced printing dots are formed on a printing medium perpendicular to the direction of movement of the printing medium, and printing is performed. The print head 3 is provided with a row of nozzles that correspond to the printing points, and the printing points are substantially When reflected on the print medium that is tilted, the reserved inkjet position is obtained. For convenience, the print head 3 is shown in a dotted circle shape, and is equipped with a tilt detection device 4, a parallel movement drive device 5, and a delay control device. The control device 6, the control device 7, and the distance sensor 8 are connected, and the control device 7 has a printing point positioning Specifically, in this embodiment, the printing medium 1 is a rectangular ceramic tile. and the printing area is the top surface of the entire ceramic tile 1.

[0072] The tilt detection device 4 detects the tilt direction and tilt angle α of the tilted printing medium 1 relative to the moving direction. As shown in Figure 2, the tilt direction includes a first direction and a second direction, and (+) in the figure indicates the first direction. Specifically, in this embodiment, when the tilt angle α is 15° or less, The print point positioning module in the control device 7 is The data detected by the tilt detector 4 is adjusted according to the tilt of the non-tilted printing medium 1. The print area reflected on the print medium 1 is calculated and acquired, and the print area that is closest to the print head 3 is acquired. The closest printing point is positioned as the starting point Z0, and the control device 7 controls the parallel movement drive as shown in FIG. The print head is tilted to the corresponding position of the print start point Z0 before the print start point Z0 by the actuator 5. The ink jet nozzle N1 moves to the printing point of the printing medium 1, and the ink jet nozzle N1 moves in the direction of movement. This corresponds to the starting point Z0 of the skewed print medium.

[0073] The control device 7 receives the detection result of the tilt detection device 4 and the printing point positioning module data. The time it takes for the print media to reach the print head is calculated by combining these two points. Printing at a specified speed V Y In the direction perpendicular to the inclined printing medium movement, The print medium is continuously moved in parallel to the tilted side of the print medium in the tilted direction. As shown in the figure, in this embodiment, when the print medium is tilted in the first direction, the print head is tilted in the opposite direction to the first direction. During the movement, the control device 7 controls the delay control device 6 to Ink-jet printing onto the print medium to form a corresponding row of print dots on the non-tilted print medium. The multiple injection holes are delayed by △t in order from the injection hole closest to the opposite side of the inclination to the injection hole closest to the inclined side. For convenience, the first row of printing points is controlled as shown in FIG. When printing and forming a pattern, the first nozzle N1 ink-jet prints at time T, and the subsequent nozzles The first nozzle ink-jet at time T+△t, and the second nozzle ink-jet at time T+△t. Three nozzles are ink-jetted at time T+2 △t, and the △t is delayed from the previous nozzle. This is the time interval between ink jets.

[0074] The print point closest to the print head among the print points in each row reflected on the tilted print medium is used as the reference. The reference point in the last row is the final reference point A1', and the reference point in the same row as the final reference point A1' is The printing point farthest from the final reference point is the end point A2', and Y , △t is set by α As shown in FIG. 3, in this embodiment, at least the following conditions are satisfied, and the speed of the print head is V Y During the movement of the inkjet, the reference point A1 is aligned with the corresponding non-tilted print point on the print medium. The nozzle N1 and the reference point A1 correspond to each other, realizing a precise printing process. The print head moves at a speed of V Y When moving and printing the corresponding row of printing points of the final reference point A1', Ink jetting from the final reference point A1', and other jetting of printing points of the corresponding row of the final reference point A1' The holes are formed together and ink-jetted sequentially with a delay of △t from the corresponding injection hole at the final reference point A1'. In addition, the ink jet nozzle that is delayed until the printing is completed corresponds to the end point A2'. .

[0075] JPEG0007804006000007.jpg49165

[0076] More specifically, in this embodiment, the print head 3 includes multiple rows of nozzles with different pitches. Alternatively, the pitch between the print head nozzles may be adjustable (not shown) to produce a non-tilted print. Among the plurality of ejection holes that form a line of printing dots on the printing medium, the pitch between adjacent ejection holes is L1, and the control device is configured to detect the tilt of the data acquired by the tilt detection device and the printing point positioning module. Depending on the data, the print head will pick up the most print points from adjacent rows of the tilted print medium. The time interval between the closest printing points is set as △T' = △Tcosα, and the pitch of the nozzles is set as or the pitch of the injection holes is set to L1'=V X Adjust as △Tsinα+L1cosα, ΔT is the ink jet spacing between adjacent rows of print dots on an uninclined print medium. In addition, L1 and △T are both known. Specifically, the geometric relationship is shown in Figures 5 and 6. For convenience of illustration, only a small number of printing points are shown in FIG. 6, and the printing points indicated by the dotted lines are inclined at an angle of α. This is a solid line of print points reflected on the print medium. Printing effects can be restored more accurately.

[0077] The print head continues to print parallel to the tilted print medium until it has completed printing the pattern. The pattern is not tilted or deformed by the printing medium, and the printing medium is not tilted. Achieve the same printing effect.

[0078] Example 3 As shown in FIG. 7, this embodiment uses rectangular printing media ABCE whose tilt direction is clockwise. and a control module for controlling the tilt of the printing medium. A printing system is provided.

[0079] As shown in FIG. 7, this printing system includes a print head 100 and a print content 200. The print head 100 prints the print medium AB based on the preset print content 200. The pattern or color is formed on the CE, and the print content 200 is generally a pattern set by the software. The print content 200 is not a physical object, but a pattern or the like. is embodied in FIG. 7 and is used merely as an illustrative example.

[0080] The data processing module is for acquiring the tilt state of the printing medium ABCE, The control module determines the print content 20 based on the tilt state acquired by the data processing module. 0, and the print head 100 adjusts the print media ABCE based on the print content 200. and a data processing module for controlling the pattern and / or color to be formed on the The specific processing and adjustment steps of the rule and control module are as follows:

[0081] S1: The data processing module acquires the tilt state of the printing medium ABCE, and includes the tilt angle of the printing medium ABCE and the position of its printing reference point B.

[0082] S21: The control module receives the print medium acquired by the data processing module in step S1. The print content 200 is adjusted based on the tilt state of the print medium ABCE, and is mirror symmetrical with the print medium ABCE. When the print reference point 3 is transmitted to the print head 100, step S22 is executed. .

[0083] S22: The control module determines whether the print head 100 is printing the adjusted print content 2 in step S21. Based on 00, control the printing medium ABCE to print until completion.

[0084] The system provided in this embodiment prints data by calculation or measurement of the data processing module. When the tilt state of the media is acquired, the control module adjusts the print content to correct the tilt. It can correspond to the printing medium, so that the printing of the inclined printing medium can be completed smoothly, and the overall The adjustment process is not manual, making it highly efficient and low cost.

[0085] As a preferred solution, as shown in Figure 8, the tilt angle is θ and the print media ABCE Since the included angle between the side CE and the reference line l, the side CE is also an included angle side CE, and the reference line l is printed. The medium ABCE is a straight line parallel to the direction of transmission, and further, in this example and the following Example 4 The angle θ in step 1 and step 2 is the same as the angle α in step 2.

[0086] The data processing module includes a data calculation module and a data detection and measurement module. The data detection measurement module includes an occlusion sensor, a first distance sensor, and a second distance sensor. As shown in Figure 8, all three sensors are located on the reference line l, and the occlusion sensor The first distance sensor is located at point D1, the second distance sensor is located at point D2, and the third distance sensor is located at point D3. Three points are provided, and the abscissas of points D1, D2 and D3 are x1, x2 and x3, respectively.

[0087] The specific execution process of step S1 is as follows.

[0088] S11: The occlusion sensor detects whether the horizontal coordinate of the printing reference point B satisfies x1. If so, the first distance sensor and the second distance sensor execute step S12.

[0089] S12: The first and second distance sensors are at points D2 and D3, respectively, and the included angle CE Measure the vertical distances y2 and y3.

[0090] S13: The data calculation module calculates the abscissa x2 of point D2, the abscissa x3 of point D3, and the step The inclination angle θ is determined based on the y2 and y3 measured in step S12, and the abscissa x2 of point D2 is calculated. , the abscissa x3 of point D3, y2 and y3 measured in step S12, The position of the printing reference point B is identified based on the length.

[0091] The line perpendicular to the base line l with points D2 and D3 as its end points and the included angle side CE intersect at two points K and and F, and none of the intersections overlaps with the end points of the included angle side CE.

[0092] JPEG0007804006000008.jpg40166

[0093] JPEG0007804006000009.jpg30165

[0094] Example 4 As shown in FIG. 9, this embodiment prints rectangular printing media ABC having a counterclockwise tilt. A printing medium processing method for processing gradients, including a data processing module and a control module, is applied to E. As shown in FIG. 9, the printing system includes a print head 100. The print head 100 also communicates with the print content 200, and the print content 200 is preset. 0, a pattern or color is formed on the printing medium ABCE, and the printing content 200 is generally The print content 200 is a pattern or design set by software, but it is not a physical object. In this embodiment, the print content 200 is embodied in FIG. 9 and is used merely for illustrative purposes.

[0095] The data processing module is mainly for acquiring the tilt state of the printing medium ABCE. The control module mainly determines the printing speed based on the tilt state obtained by the data processing module. The content 200 is adjusted, and the print head 100 prints the print medium based on the print content 200. It is for controlling ABCE to form patterns and / or colors, and data processing The specific processing and adjustment steps of the processing module and the control module are as follows:

[0096] S1: The data processing module acquires the tilt state of the printing medium ABCE, and includes the tilt angle of the printing medium ABCE and the position of its printing reference point C.

[0097] S21: The control module receives the print medium acquired by the data processing module in step S1. The print content 200 is adjusted based on the tilt state of the print medium ABCE, and is mirror symmetrical with the print medium ABCE. When the print reference point C is transmitted to the print head 100, step S22 is executed. .

[0098] S22: The control module determines whether the print head 100 is printing the adjusted print content 2 in step S21. Based on 00, control the printing medium ABCE to print until completion.

[0099] The system provided in this embodiment prints data by calculation or measurement of the data processing module. When the tilt state of the media is acquired, the control module adjusts the print content to correct the tilt. It can correspond to the printing medium, so that the printing of the inclined printing medium can be completed smoothly, and the overall The adjustment process is not manual, making it highly efficient and low cost.

[0100] In a preferred solution, the tilt angle is θ and the print media ABCE are as shown in FIG. Since the included angle between the side CE and the reference line l, the side CE is also an included angle side CE, and the reference line l is The data processing module is a straight line parallel to the direction in which the printing medium ABCE is transmitted. a data calculation module and a data detection and measurement module, 10, including an occlusion sensor, a first distance sensor, and a second distance sensor; The two sensors are all located on the reference line 1, the occlusion sensor is located at point D1, and the first The distance sensor is provided at point D2, the second distance sensor is provided at point D3, and the points D1 and D2 and the abscissas of D3 are x1, x2 and x3, respectively.

[0101] The specific execution process of step S1 is as follows.

[0102] S11: The occlusion sensor detects whether the horizontal coordinate of the printing reference point C satisfies x1. If so, the first distance sensor and the second distance sensor execute step S12.

[0103] S12: The first and second distance sensors are at points D2 and D3, respectively, and the included angle CE Measure the vertical distances y2 and y3.

[0104] S13: The data calculation module calculates the horizontal coordinate x2 of point D2, the horizontal coordinate x3 of point D3, and the step The tilt angle θ and the position of the printing reference point C are determined based on y2 and y3 measured in S12. do.

[0105] The line perpendicular to the base line l with points D2 and D3 as its end points and the included angle side CE intersect at two points G and and F, and none of the intersections overlaps with the end points of the included angle side CE.

[0106] JPEG0007804006000010.jpg26166

[0107] As shown in Figure 10, we can see that ∠CEI and ∠CGH are equal to θ, and mathematical geometry The calculation yields y1 = y2 + (x1 - x2) × tanθ, and y1 is the distance from the printing reference point C. The vertical distance from the point D1 to the reference line is calculated as y1, and then printed according to the abscissa x1 of point D1. The exact position (x1, y1) of the reference point C can be identified.

[0108] Of course, the above embodiments of the present invention are merely provided to clearly illustrate the technical solutions of the present invention. The claims of the present invention are merely illustrative and are not limitations on specific embodiments of the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention are included in the scope of the present invention. It should be included within the scope of the claims.

Claims

1. 1. A method of printing on an inclined print medium with a print head, comprising: Identifying the tilt angle of the printing medium and the position of the print reference point after tilting, rotating the print content by the same angle as the print medium based on the tilt angle, and then adjusting the position of the print content based on the position of the print reference point; When the print reference point is transmitted to the print head, the print head is controlled in accordance with the print content to start printing on the print medium; the tilt angle is an included angle between one side of the printing medium and a reference line, The side of the printing medium corresponding to the tilt angle is an included corner side of the printing medium, the reference line is a straight line parallel to the direction in which the print medium is transmitted; Specifically, the determination of the tilt angle of the printing medium includes: A method characterized by measuring the vertical distances y2 and y3 from points D2 and D3 on the reference line to the included corner sides of the printing medium when condition Sc1 is satisfied, and determining the tilt angle of the printing medium based on the abscissa x2 of point D2, the abscissa x3 of point D3, y2, and y3.

2. The condition Sc1 is that the abscissa of the printing reference point is x1, the shape of the printing medium is rectangular, Specifically, the step of identifying the position of the printing reference point at which the printing medium is tilted includes the steps of: When the printing medium is tilted clockwise, the position of the tilted printing reference point is identified based on the x1, x2, x3, y2, y3 and the length of the side of the printing medium perpendicular to the included angle side; 2. The printing method according to claim 1, wherein when the printing medium is tilted counterclockwise, the position of the tilted printing reference point is identified based on x1, x2, x3, y2, and y3.

3. the included corner side is the long side of the printing medium that is closest to the reference line, Specifically, determining the tilt angle of the printing medium based on the abscissa x2 of point D2, the abscissa x3 of point D3, the y2, and the y3 includes the following steps: When the print medium is tilted clockwise, the relationship tan θ=(y ２ -y ３ ) / (x ３ -x ２ ) to determine the tilt angle; When the print medium is tilted counterclockwise, the relationship tan θ=(y ３ -y ２ ) / (x ３ -x ２ ) to determine the tilt angle; θ is the inclination angle, 3. The printing method according to claim 1, wherein x2 and x3 satisfy x3>x2.

4. When the printing medium is tilted clockwise, the position of the tilted printing reference point is identified based on the x1, x2, x3, y2, y3, and the length of the side of the printing medium perpendicular to the included angle side, and specifically, When the print medium is tilted clockwise, y １ = (y ３ +b / cos θ)-(x 1 -x 3)×tan θ, and specifying the position of the printing reference point at which the printing medium is tilted; When the printing medium is tilted counterclockwise, the position of the tilted printing reference point is identified based on the x1, x2, x3, y2, and y3, and specifically, When the print medium is tilted counterclockwise, y １ = y ２ +(x １ -x ２ ) × tan θ, and determining the position of the printing reference point where the printing medium is tilted; y1 is the vertical height from the printing reference point to the reference line, b is the length of the short side of the printing medium, 4. The printing method according to claim 3, wherein x1, x2, and x3 satisfy x1>x3>x2.

5. 1. A system for printing on an inclined print medium using a print head, comprising: a control module and a data processing module; the data processing module is for determining a skew angle of the printing medium and a position of a skewed printing reference point; the control module is for rotating the print content by the same angle as the print medium based on the tilt angle identified by the data processing module, and then adjusting the position of the print content based on the position of the print reference point identified by the data processing module; the control module is for controlling the print head in accordance with the print content to start printing on the print medium when the print reference point is transmitted to the print head; the tilt angle is an included angle between one side of the printing medium and a reference line, The side of the printing medium corresponding to the tilt angle is an included corner side of the printing medium, the reference line is a straight line parallel to the direction in which the print medium is transmitted; The data processing module includes a data calculation module and a data detection and measurement module, and the data processing module is for determining the skew angle of the printing medium, specifically: the data detection and measurement module is for detecting whether a condition Sc1 is satisfied, and for measuring vertical distances y2 and y3 from points D2 and D3 on the reference line to the included corner sides of the printing medium, respectively, if the condition Sc1 is satisfied; The system, wherein the data calculation module is for determining a skew angle of the printing medium based on the abscissa x2 of the point D2, the abscissa x3 of the point D3, the y2, and the y3.

6. The condition Sc1 is that the abscissa of the printing reference point is x1, the shape of the printing medium is rectangular, The data processing module is for determining the position of the printing reference point at which the printing medium is tilted, and specifically, 6. The system of claim 5, wherein the data calculation module is configured to determine the position of a tilted printing reference point based on the x1, the x2, the x3, the y2, the y3, and the length of a side of the printing medium perpendicular to the included angle side when the printing medium is tilted clockwise, and to determine the position of a tilted printing reference point based on the x1, the x2, the x3, the y2, and the y3 when the printing medium is tilted counterclockwise.

7. the data detection measurement module includes an occlusion sensor, a first distance sensor, and a second distance sensor; The data detection and measurement module is for detecting whether the condition Sc1 is satisfied, and for measuring the vertical distances y2 and y3 from the points D2 and D3 on the reference line to the included corner sides of the printing medium, respectively, if the condition Sc1 is satisfied. Specifically, The occlusion sensor is for detecting whether the condition Sc1 is satisfied, the first distance sensor is for measuring a vertical distance y2 from a point D2 on the reference line to an included corner side of the printing medium when the occlusion sensor determines that the condition Sc1 is satisfied; The system described in claim 5 or 6, characterized in that the second distance sensor is for measuring the vertical distance y3 from point D3 on the reference line to an included corner edge of the printing medium when the occlusion sensor determines that condition Sc1 is met.

8. the included corner side is the long side of the printing medium that is closest to the reference line, The data calculation module is for determining the tilt angle of the printing medium based on the abscissa x2 of the point D2, the abscissa x3 of the point D3, the y2, and the y3, and specifically: The data calculation module calculates the relationship tan θ=(y ２ -y ３ ) / (x ３ -x ２ ) and when the print medium is skewed counterclockwise, the relationship tan θ=(y ３ -y ２ ) / (x ３ -x ２ ) to identify the tilt angle based on The data calculation module is for determining the position of the tilted printing reference point when the printing medium is tilted clockwise based on the x1, x2, x3, y2, y3, and the length of the side of the printing medium perpendicular to the included angle side, and specifically: The data calculation module calculates y when the print medium is skewed clockwise. １ = (y ３ +b / cos θ)-(x 1 -x 3)×tan θ, and to identify the position of the printing reference point at which the printing medium is tilted, The data calculation module is for determining the position of the tilted printing reference point based on the x1, x2, x3, y2, and y3 when the printing medium is tilted counterclockwise, and specifically: The data calculation module calculates y when the print medium is skewed counterclockwise. １ = y ２ +(x １ -x ２ ) × tan θ to identify the position of the printing reference point where the printing medium is tilted, θ is the inclination angle, y2 and y3 are data acquired by the data detection measurement module; The x1 is an abscissa that satisfies the condition Sc1, x2 is the abscissa of point D2, x3 is the abscissa of point D3, y1 is the vertical height from the printing reference point to the reference line, b is the length of the short side of the printing medium, 8. The system according to claim 7, wherein x1, x2, and x3 satisfy x1>x3>x2.

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