CN114074487B - Method for printing on inclined printing medium by using printing head - Google Patents
Method for printing on inclined printing medium by using printing head Download PDFInfo
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- CN114074487B CN114074487B CN202010806525.XA CN202010806525A CN114074487B CN 114074487 B CN114074487 B CN 114074487B CN 202010806525 A CN202010806525 A CN 202010806525A CN 114074487 B CN114074487 B CN 114074487B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2135—Alignment of dots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
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- Ink Jet (AREA)
Abstract
The invention discloses a method for printing on a printing medium with a printing head, wherein the printing medium is inclined, and the printing medium moves relative to the printing head, and the method comprises the following steps: s1, acquiring the inclination direction and the inclination angle of a printing medium relative to the moving direction; s2, acquiring a starting point of the printing inclined printing medium; s3, the printing head starts to print from a starting point and continuously translates towards the inclined opposite side in the direction perpendicular to the moving direction of the inclined printing medium, and more than one jet orifice is controlled to delay ink jet in the direction parallel to the moving direction of the inclined printing medium in the translation process; and S4, forming the pattern on the inclined printing medium without deformation. The same printing effect of printing the printing medium which is not inclined can be restored on the printing medium after the inclination, so that more waste products caused by incomplete printing and pattern deformation are avoided, the existing materials are fully utilized, and the yield is improved. And manual adjustment is not needed, so that the yield is ensured, and the production efficiency is obviously improved.
Description
Technical Field
The present invention relates to the field of printing, and more particularly, to a method of printing on a print medium that is tilted using a printhead.
Background
In order to meet the requirement of people on aesthetic feeling in modern society, patterns are processed in the production process of many products, so that the finished products have ornamental value. And the more common pattern processing mode among the prior art is exactly the printing mode, and the product is conveyed to the printer head on the production line and is printed, has had basic pattern promptly after beating printer head. Such as ceramic tiles, are printed after being transported to the print head in the production line, and the basic pattern formation is completed after passing through the print head. However, the pattern processing flow of the products in the prior art has defects, especially in the printing process of the ceramic tile, that is, when the printed medium is inclined, the patterns which are complete or not deformed cannot be printed on the printed medium, which easily causes waste products. When the printing medium inclines, the pattern corresponding to the printing medium which is not inclined and formed by the printing head does not correspond to the inclined printing medium, and a product formed based on the inclined printing medium shows a deformed state of the pattern compared with other products; when the distance between the pattern formed on the non-inclined printing medium and the boundary of the printing medium is smaller, the pattern is lost when the pattern is printed on the inclined printing medium; for example, a square area of a printed pattern is originally intended to appear on a tile, and a parallelogram with a missing portion may be formed when the tile is tilted. Both of the above two conditions directly result in the generation of waste products, and the production cost is greatly improved.
The prior art can only overcome the defects generally by adopting a manual adjustment mode, but the manual adjustment is time-consuming, the production efficiency is easy to reduce, the manual adjustment precision is also problematic, and the pattern printing effect is not good and the pattern is incomplete or deformed after the adjustment. Moreover, in consideration of production safety, technical secrecy and the like, the process of moving the product to the printing head for printing can be relatively closed, and a space for manual operation cannot be provided in the production process, so that it is not practical to overcome the above defects by manual adjustment. Therefore, there is a need for a method of printing on an inclined printing medium, which can print a reduced pattern on the inclined printing medium while avoiding disadvantages caused by manual adjustment.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art, and provides a method for printing on an inclined printing medium by using a printing head, which can print on the inclined printing medium without manual adjustment, and the printed pattern is complete and is not deformed, thereby reducing the possibility of generating waste products and ensuring the production efficiency.
The invention adopts the technical scheme that a method for printing on a printing medium with inclination by using a printing head is adopted, and the printing medium is relative to the printing head at a speed V X Moving and printing while passing a print head, the print head forming a plurality of linear rows of print dots on an untilted print medium perpendicular to the direction of movement of the print medium, the print head being provided with a plurality of rows of orifices corresponding to the print dots, the method comprising the steps of:
s1, acquiring the inclined state of an inclined printing medium, including an inclined direction and an inclined angle alpha relative to a moving direction;
the moving direction is a direction in which the printing medium gradually approaches the printing head relative to the printing head, namely a printing medium moving direction; the inclined direction includes directions towards two sides of the moving direction of the printing medium, namely, one end of the printing medium which is not inclined and is closest to the printing head is taken as an inclined end, the opposite end is taken as a reference end, when the distance of the inclined end relative to the reference end in the direction vertical to the moving direction of the printing medium changes, the printing medium is inclined at the moment, and the direction of one side of the inclined end which is larger than the distance of the reference end in the direction vertical to the moving direction of the printing medium is the current inclined direction; the inclination is usually slight, substantially during production, due to no external disturbances, usually only caused by shaking or small impacts; taking the rectangular printing medium as an example, that is, two sides of the transmission direction of the transmission belt are respectively the first side and the second side, and the directions from the transmission belt to the first side and the second side in the direction perpendicular to the moving direction of the printing medium are respectively the first direction and the second direction, when the inclined end of the printing medium is closer to the first side than the reference end, the inclined direction of the printing medium is the first direction at this time. The inclination angle alpha is an included angle between any straight line or side line parallel to the moving direction of the printing medium on the printing medium which is not inclined and the moving direction after the printing medium is inclined, and the included angle is easier to obtain when the printing medium is in a rectangular structure and only needs to obtain the included angle between the side edge parallel to the moving direction when the printing medium is not inclined and the moving direction after the side edge is inclined; the inclination direction and the inclination angle alpha of the printing medium with the inclination can be obtained in various ways, including complex image recognition, setting of a correlation type distance measuring sensor and combination of geometric relation calculation. Acquiring the direction and angle of the tilt facilitates subsequent print heads to print in a particular print strategy based on the tilt direction and tilt angle;
s2, acquiring a printing starting point Z of the inclined printing medium 0 (ii) a That is, a printing region where the non-inclined printing medium is reflected on the inclined printing medium is obtained, and a printing point closest to the printing head in the printing region is taken as a starting point Z 0 ；
The printing head forms patterns on the printing area of the non-inclined printing medium, so in order to ensure that the inclined printing medium has basically consistent effect after being printed, the printing area reflected on the inclined printing medium needs to be acquired based on the known distribution of the printing area of the non-inclined printing medium, and the printing area and the printing medium size of the same product are basically unchangedTherefore, the inclined printing medium printing area can be obtained by utilizing the geometric relation based on the inclined direction and the inclined angle, and the printing point Z which is closest to the printing head in the printing area can be obtained based on the printing area 0 (ii) a Help at the starting point Z 0 Immediately starting printing when entering the ink-jet range of the printing head, and preventing the starting point Z from being missed 0 And missing patterns or printing area shifts. The printing points are formed by ink jetting of the printing head and belong to virtual points before ink jetting, and the printing points are based on the printing points for convenience of description; the starting point is actually a virtual point which is reflected on the inclined printing medium and is closest to the printing head before ink is jetted, and can be obtained through geometric relation calculation, if a square area is to be printed, the starting point is a corner which is close to the printing head after the square area is inclined;
s3, printing head self-starting point Z 0 Starting printing, continuously translating towards the opposite side of the incline in the direction perpendicular to the moving direction of the inclined printing medium, and controlling more than one jet orifice to delay ink jet in the direction parallel to the moving direction of the inclined printing medium in the translation process;
the translation is the translation of the printing head relative to the printing medium in the direction perpendicular to the moving direction of the printing medium; the printing head starts to print from a starting point, at the moment, because a printing area on the inclined printing medium is inclined compared with a printing area on the non-inclined printing medium, the starting point is used as the starting point, the printing head is continuously moved in a direction vertical to the moving direction of the printing medium, and at least one side corresponding to the printing area can print; the movement towards the opposite side of the tilt, i.e. the print head is translated in the direction opposite to the direction of tilt; however, the shift alone only causes the pattern to be deformed, for example, if a square pattern is printed on a rectangular non-inclined printing medium, after the printing medium is inclined, although the shift can cause the printing area reflected on the inclined printing medium to be printed, the printed pattern is a parallelogram with a missing part on the rectangular printing medium, and the pattern is deformed and incomplete. When the printing medium is inclined, each row of printing points printed and formed on the non-inclined printing medium is also inclined substantially, namely, the distance between the printing point in the same row and the printing head in the moving direction is changed to be equal after the inclination, and the distance between the printing point in the same row and the printing head in the moving direction is gradually increased in the inclined direction. At the moment, the problem cannot be solved by adopting the traditional mode of simultaneously jetting ink through a row of jet holes to form a row of printing points, the problem can be solved by controlling more than one jet hole to jet ink in a delay way in the direction parallel to the moving direction of the printing medium, and more than one jet hole is set to jet ink in a delay way according to the inclination angle and the reflected printing area, so that a row of inclined printing points can be formed and just correspond to the inclined printing medium, and the effect of printing on the non-inclined printing medium is restored.
And S4, continuously and relatively translating the printing head until the complete pattern is formed on the inclined printing medium, wherein the pattern is not deformed due to the inclination of the printing medium. The printing head continuously translates in the direction perpendicular to the moving direction of the printing medium after starting to print from the starting point, and the jet holes are matched with the translation to delay ink jetting one by one, so that an inclined printing area can be printed, the same effect as that of printing on an untilted printing medium is basically realized corresponding to the inclined printing medium, and the pattern is not deformed due to the inclination of the printing medium. And because the delay ink jet forms a plurality of rows of inclined printing points in the printing process, the jet holes are not caused to be sprayed empty, so that the complete pattern is basically presented on the inclined printing medium.
By the method, the problem that a product cannot be printed after the printing medium is inclined in the production process in the prior art is solved, complete and non-deformable patterns can be basically restored on the inclined printing medium, and the printing medium does not need to be manually adjusted; the production efficiency is ensured, and meanwhile, the possibility of waste products is reduced. Meanwhile, according to the method, a complex mechanical structure is not needed, the response speed of the printing head can be guaranteed, so that accurate ink jet control is achieved, large space occupation can be avoided, and the printing head can be more easily put into various production environments for use. Meanwhile, the inclination is usually expressed as a small-amplitude inclination in the production process, so that even if the spray holes of the printing media which are not inclined to print and the spray holes of the printing inclined printing media are the same spray holes, the printing can basically present and restore a complete and non-deformable pattern when an error exists in the printing; and in fact, the printing head prints a row of basically continuous linear structures, thereby further weakening the possible errors of the patterns visually; even the conventional printing head in the prior art can be directly used in combination with the circuit control to complete the printing on the inclined printing medium by the method, so that the cost for solving the problems is further reduced.
Further, the printing head is connected with a translation driving device, a time delay control device and a control device, and the translation driving device drives the printing head to translate in the direction perpendicular to the moving direction of the printing medium; the time delay control device is used for controlling the jet orifice of the printing head to delay ink jet; the control device is at least used for sending instructions to control the translation driving device and the time delay control device.
Further, the print medium is at a velocity V relative to the printhead X Moves and is printed while passing the print head, at speed V in step S3 Y Continuously translating the relatively inclined printing medium towards the inclined opposite side in the direction perpendicular to the moving direction of the inclined printing medium, wherein in the translation process, a plurality of spray holes forming one row of printing points of the inclined printing medium sequentially delay delta t ink jet from the spray holes close to the inclined opposite side to jet ink to the other side, namely, the inclined printing medium is jetted with ink to form a plurality of spray holes corresponding to the same row of printing points of the non-inclined printing medium, and the delta t ink jet is sequentially delayed from the spray holes close to the inclined opposite side to the spray holes close to the inclined side; the V is Y And delta t is set according to alpha. One of the delayed ink jetting modes is that the jet holes can jet ink on corresponding rows in sequence by delaying delta t ink jet from the jet hole close to the inclined opposite side to the jet hole close to the inclined side, so that the pattern is not deformed. The sequential delay delta T ink jet takes a row of spray holes arranged from top to bottom as an example, the first spray hole, the second spray hole, \\8230, and the Nth spray hole are arranged from top to bottom, so that after the first spray hole sprays ink at the time T, the second spray hole sprays ink at the time T + [ delta ] T, the Nth spray hole sprays ink at the time T + [ N-1 ] delta ] T, and the N spray holes spray ink to form a row of inclined printing points. More importantly, due to the fact that the print head movesThe distance and how much the ink is ejected in the direction opposite to the moving direction depends on the angle of the printing medium after the inclination, so that V is used to complete the printed pattern without deformation Y And delta t is set according to alpha.
Further, a print dot closest to the print head among a print dot in an arbitrary line reflected on the inclined print medium is acquired and recorded as a 1 Dot, farthest from A, of the same column of printed dots 1 The printing point of the dots is A 2 Point, note A 1 Point and point A 2 The distance of the point in the moving direction of the vertical inclined printing medium is omega, the number of a row of jet holes which correspondingly form the same row of printing points is N, and then V is Y ＝V X tanα，
Taking a rectangular printing area as an example, the printing head forms a plurality of nozzles corresponding to printing points, and the nozzle N corresponding to each row of printing points close to the printing head 1 By reference, printing a dot Z closest to the print head in its translation to eject the first column 0 To the last column of ink jets closest to the print head to print dot A 1 In the process of `, Z 0 And A 1 ' distance in translation direction is d 1 And at this time d 1 = printing zone Z 0 The length of the corresponding side is multiplied by sin alpha; while substantially moving the print zone Z in the print media moving direction 0 The distance of the corresponding side length x cos alpha, the print head is moved from Z 0 Is translated to A 1 Time of
Therefore, it is possible to
At this time, the starting point Z in the first row of printing dots 0 Represents A 1 First column of dots, last dot Z 1 Represents A 2 At this time point Z 1 Corresponding orifice compared to point Z 0 Delay t required for ink jetting corresponding to jet hole 2 The time can correspond exactly to the last printed dot in the oblique column of printed dots. Due to Z 0 And Z 1 A distance d in the moving direction of the printing medium 2 (= ω × sin α), then
At the same time, since the printed dots are arranged at equal intervals, Z 0 To Z 1 Corresponding N spray holes from Z 0 After ink is jetted, the ink is sequentially delayed by delta t, then
And because no other columns of print dots are involved, dot A is printed according to any one column 1 、A 2 Thus, Δ t can be obtained.
Further, to simplify the apparatus, the print head may be adapted to print on inclined print media with orifices that print dots in the same column of the non-inclined print media. Alternatively, the inclined printing medium may be printed according to the rule specified by the above formula by using orifices having a different pitch from the original non-inclined printing medium. Further, A of the first column or the last column is obtained 1 、A 2 Printing dots to calculate and set V Y And Δ t.
Furthermore, the printing head comprises a plurality of rows of jet holes with different intervals or the intervals among the jet holes of the printing head are adjustable, and the interval of adjacent jet holes in the plurality of jet holes forming a row of printing points on the non-inclined printing medium is L 1 Before step S3, printing is carried out by arranging a printing head to print printing points closest to the printing head in adjacent rows of printing points of the inclined printing medium, wherein the time interval is delta T '=deltaT cos alpha, and the interval of the selected jet holes or the adjusted jet holes is L' 1 ＝V X △T sinα+L 1 cos α, said Δ T being the ink jet spacing between printing dots of adjacent columns of an untilted print medium.
When printing inclined printing medium, the jet hole interval L 1 And basically generating no visually perceptible error under the condition of smaller inclination angle when the ink jet interval delta T of the printing points close to the printing head of each row of printing points is not changed; when the inclination angle is large, the position to be printed may be located between the two nozzle holes, and when the upper or lower nozzle hole is used to print the point, the point may be printedVisual errors may occur at the edge positions of the pattern. At the moment, the precision of the printing head in the translation direction can be improved by increasing, for example, the number of the jet holes is increased while the jet hole distance is reduced, and the error caused by a larger inclination angle is reduced while the printing width is ensured.
Furthermore, the printing head is provided with a space L between adjacent jet holes 1 Different multi-row spray holes or adjacent spray hole spacing L 1 The adjustable more than one row of spray orifices can also overcome the problem that the distance between adjacent printing points in the moving direction of the printing medium and the translation direction of the printing head does not completely correspond to the spray orifices in the ink jet mode to generate errors after the adjacent printing points are inclined. Taking a rectangular tile to be completely covered by a pattern as an example, the first row of printing points is recorded as Col 1 The second row of printing points is Col 2 The printing points of the same row from the nearest printing head to the farthest printing head are N in sequence 1 、N 2 、…、N N Then Col 1 -N 1 With Col 2 -N 1 A distance of l therebetween 1 The distance between two points after tilting is l 2 The angle of inclination is alpha, and l 1 ＝V X △T，l 1 And l 2 Equal, original printing medium matched with printing head in ink-jet Col 1 -N 1 Post-shift to print Col 2 -N 1 Is a distance l in the moving direction of the printing medium 1 And after tilting, the print head ejects ink Col 1 -N 1 Translated to Col 2 -N 1 The distance in the moving direction of the printing medium in the process is l 2 cos α, due to Δ T' V X ＝l 2 cos α, then Δ T' =Δt cos α; in order to enable the jet holes and the printing points to jet ink, a pattern is restored with high precision, wherein one scheme corresponds to Col 1 -N 1 Is moved to Col 2 -N 1 When ink is jetted, the original Col is corresponded at the moment 1 -N 2 When the time delay of the jet hole corresponds to Col 1 -N 2 Ink jet, then spacing between adjacent orifices L' 1 Need to be equal to Col 1 -N 2 With Col 2 -N 1 Distance in the direction of translation of the print head, then L 'can be calculated using the geometric relationship at this time' 1 ＝V X △T’tanα+L 1 cosα＝V X △T sinα+L 1 cos α, wherein L 1 And corresponding a row of printing points to the space between adjacent jet holes in the plurality of jet holes when the original printing medium is not printed in an inclined way. The Col 1 -N 1 I.e. the starting point of the closest print head among the first series of print points closest to the print head.
Further, the printing point closest to the nozzle in the printing points corresponding to the last column of the printing medium which is not inclined on the inclined printing medium is taken as a final reference point A 1 ', from the final reference point A 1 ' the printing point in the same column and farthest from the final reference point is the tail point A 2 '; in step S3 the print head is driven by V Y Speed moving printing forms a final reference point A 1 ' self-ending reference point A when printing dots in corresponding column 1 ' ink jetting begins, together forming a final reference point A 1 ' the rest of the jet holes corresponding to the row of printing points are from the final reference point A 1 ' start of corresponding jet orifice is delayed by delta t to jet orifice and tail point A 2 ' correspond. When not specifically described below, the print dots of one column of the inclined print medium are print dots of one column corresponding to the print medium that is not inclined. That is, the nozzle closest to the inclined side in a row of nozzles firstly ejects ink, and the rest nozzles sequentially delay ink ejection. And when the printing head continuously translates to the last row of printing points at a constant speed, ink jetting from the final reference point is ensured, the jet orifice delayed to the last ink jetting corresponds to the last printing point, so that ink jetting of the last row of inclined printing points is completed, complete limitation of a printing area from the beginning of printing to the completion of printing is completed, the distribution of patterns printed on the inclined printing medium relative to the inclined printing medium is the same as the distribution of patterns on an untilted printing medium, and the completeness and the non-deformation of the patterns are ensured. Actually, the final reference point and the tail point can be obtained by combining known data with geometric calculation, for example, when the printing area is rectangular, the final reference point and the tail point are actually two corner points of the printing medium far away from the printing head, and are obtained by combining known inclination angle alpha, printing area size and distribution calculation, so that the translation speed and delta t of the printing head can be calculated conveniently, and the printing head just after printing can be obtainedInk is jetted from the final reference point and the delayed jetting ends at the tail point. And the ink is sequentially delayed, namely, the ink is delayed one by one towards the other end of the final reference point after the ink is sprayed from the final reference point by the rest jet holes.
Further, the print head is at the printing start point Z in step S3 0 Moving to starting point Z 0 The jet orifice of the corresponding non-inclined printing medium printing point ink jet is in the moving direction and the inclined printing medium starting point Z 0 And (7) corresponding. Because the starting point is used as the printing point closest to the printing head, and the general pattern has a plurality of colors, in order to realize the same printing effect and corresponding relation with the non-inclined printing medium, the starting point can be the same as the spray hole of the corresponding point on the non-inclined printing medium; thereby facilitating the subsequent ink jet based on the same jet orifice and reducing the operation complexity. And the inclined printing medium can also generate position change, so that the printing head is moved to the corresponding jet orifice to correspond to the starting point in the moving direction, the printing medium can be immediately printed after moving into the printing range, and the temporary alignment Z is avoided 0 The gap time is fully utilized to improve the printing efficiency.
Further, the printing dot closest to the printing head among each column of printing dots reflected on the inclined printing medium is taken as the reference point A 1 Step S3 printing head V Y During the speed movement, the reference point A is moved 1 Corresponding non-inclined printing medium printing point ink jet orifice and reference point A 1 And correspond to each other. In the process of forming a plurality of rows of printing points by translation, the printing is started from the printing point closest to the printing head in each row, so that missing printing is prevented, accurate printing of the boundary on one side of a printing area is realized, and the reference is provided for ink jetting of other jet holes by using the boundary conveniently; the integrity of the boundary pattern is guaranteed, the implementation difficulty is reduced, and other jet orifices can complete printing of the whole printing area according to a specific rule.
Further, the print medium is placed on a conveyor belt at a velocity V relative to the printhead X The printing head is also connected with a tilt detection device for detecting the tilt state of the printing medium and a printing point positioning device for at least obtaining a printing starting pointAnd a distance sensor for sensing a position of the inclined printing medium relative to the printing head at a certain time period or a certain moment before printing. The tilt detection means can be implemented using sensors for measuring tilt conventionally used in the prior art; the printing point positioning device can be a device comprising a calculation module and a distance measuring module, and can also be an image recognition device, and a starting point Z can be obtained by detecting the inclination direction, the inclination angle, the distribution of a known printing area on an untilted printing medium and combining with geometric operation 0 A position. The distance sensor can feed back the distance between the printing medium and the printing head, thereby facilitating the printing based on V X Calculating the alignment Z of the print head in the direction of travel of the print medium 0 When to start to jet ink downwards on the premise of (2), is favorable for accurately controlling the ink jetting, thereby improving the printing precision.
Further, the printing medium is ceramic tiles. When the oblique printing method is applied to a production line of ceramic tiles, more waste plates can be avoided, and loss caused by the waste plates is reduced; simultaneously, also can realize the slope automatically and print the ceramic tile, do not need artificial interference, more help the ceramic tile to produce under relative confined environment, separate whole production line for the ceramic tile interference factor in the production process is still less, and the ceramic tile quality of production is better.
Further, Z reflected on the inclined printing medium is acquired according to the inclination angle alpha of the inclined printing medium and the distance of the known printing area relative to the non-inclined printing medium boundary in the step S2 0 Point, at the same time, also acquire and Z 0 Dots belonging to the same row as the printed dot and furthest from Z 0 Z of a point 1 And (4) point. Z compared to acquiring other columns of printed dots on the print medium 0 Point Z 1 The dots are actually two corner points of a printing area of the printing medium and are easily obtained according to the known distribution of the printing area on the non-inclined printing medium, so that the printing head movement and the jet orifice ink jetting strategies are conveniently calculated and set.
Further, the distance between two printing points which are farthest away in the translation direction of the printing head in the plurality of printing points reflected on the inclined printing medium is recorded as D, and the inclination angle of the inclined printing medium is smaller than or equal toThe specific angle is that D is smaller than or equal to the width of at least one row of jet holes of the printing head in the translation direction. When D is larger than the width of a row of jet holes in the direction vertical to the moving direction of the printing medium, printing errors can be caused, so that the size of D cannot be larger than the width of a row of jet holes in the translation direction; taking the above-mentioned rectangular printing area as an example, D is D 1 + ω. The printing head comprises a plurality of spray heads, the spray holes are formed in the spray heads, and the plurality of spray heads and the corresponding spray holes form more than one row of spray holes in the printing head. Furthermore, the printing head is provided with more than one nozzle at both ends in the translation direction on the basis of printing the width required by the non-inclined printing medium, namely, the printing head is provided with more than one nozzle at both ends for use when printing the inclined printing medium, taking printing a rectangular pattern as an example, and after the printing medium is inclined, d 1 = printing zone Z 0 The length of the side edge of the corresponding side multiplied by sin alpha is smaller than the width of one nozzle, when the printing head is composed of 1536 nozzles, the width of the 1536 nozzles in the direction vertical to the moving direction of the printing medium is 70mm, namely, the inclined angle of the inclined printing medium is smaller than a specific angle so that d 1 ≤70mm。
Further, the width of the printing area of the non-inclined printing medium on the side close to the printing head in the moving direction is larger than or equal to the width of the side far away from the printing head. Compared with other printing areas with the middle width larger than the widths of the two sides, the printing head has simple control of the jet orifices, and is beneficial to simplifying a control circuit. Such as rectangular, square, and trapezoidal, which gradually narrows in a direction away from the print head.
Further, the printing medium is a rectangular printing medium. When the printing medium is a rectangular printing medium, the distribution of the printing area reflected on the inclined printing medium can be obtained through calculation of the printing medium based on rules, and when the printing area covers the whole printing medium, the inclination angle and the inclination direction of the printing medium can be obtained only through a simple distance measuring instrument combined with geometric calculation.
Further, the printing area on the non-inclined printing medium is a rectangular printing area. It is also convenient to combine its distance from the print medium boundary to obtain a profile that is reflected on an inclined print medium.
Compared with the prior art, the invention has the beneficial effects that: the printing strategy can be automatically adjusted for the printing medium with inclination, even if the printing medium is inclined, the printing effect same as that of the printing medium without inclination can be basically restored on the inclined printing medium, more waste products caused by incomplete printing and pattern deformation are avoided, the existing materials are fully utilized, and the yield is improved. Compared with manual adjustment in the prior art, the production efficiency is greatly improved, and the production time cannot be wasted due to manual interference; meanwhile, the invention can use the common printing head in the prior art to realize the corresponding function on the premise of not changing the mechanical structure, avoids the complexity of redesigning the printing head, can also use the printing heads with multiple rows or variable intervals to realize more accurate printing, and further improves the quality of the patterns printed on the inclined printing medium on the premise of ensuring the basic restoration of the patterns. When the invention is applied to products with regular sizes, such as ceramic tiles, the invention not only facilitates the quick calculation and the simplification of the process, but also facilitates the independence of the production process of the printing media, so that the production process is not interfered by other interference factors, such as the original manual interference of the prior art, thereby improving the quality of the corresponding finished products.
Drawings
FIG. 1 is a schematic illustration of the present invention printing on an untilted print medium.
FIG. 2 is a schematic illustration of the present invention printing on a print medium that is skewed.
FIG. 3 is a simplified schematic of the present invention printing to untilted print media.
FIG. 4 is a simplified schematic diagram of the present invention printing on a skewed print medium.
Fig. 5 is a simplified schematic diagram of printing on a skewed print medium according to the present invention (ii).
FIG. 6 is a schematic diagram of the geometry of printed dots before and after the tilting of the print medium according to the present invention.
In the figure: 1. a print medium; 2. a conveyor belt; 3. a print head; 4. a tilt detection device; 5. a translation drive device; 6. a delay control device; 7. a control device; 8. a distance sensor.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For the purpose of better illustrating the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Examples
As shown in fig. 1 and 2, this embodiment discloses a method of printing on a print medium that is inclined using a print head, the print medium 1 being placed on a conveyor belt 2 at a velocity V relative to the print head 3 X Moving and printing when passing through the printing head 3, wherein the printing head 3 forms a plurality of rows of linear printing points vertical to the moving direction of the printing medium on the non-inclined printing medium, and the printing head 3 is provided with a plurality of rows of jet holes which correspondingly form the printing points; the printing points are substantially reflected on the inclined printing medium, namely, the reserved ink-jet positions, and the embodiment is convenient to represent and is represented in a dot-and-circle shape; the printing head is connected with an inclination detection device 4, a translation driving device 5, a time delay control device 6, a control device 7 and a distance sensor 8, and the translation driving device 5 drives the printing head 3 to translate in the direction vertical to the moving direction of the printing medium 1; the time delay control device 6 is used for controlling the jet orifice of the printing head 3 to delay ink jet; the control device 7 is provided with a printing point positioning module consisting of a printing point positioning device, and the control device 7 is also used for sending an instruction to control the translation driving device 5 and the time delay control device 6.
Specifically, in this embodiment, the printing medium 1 is a rectangular tile, and the printing area is the upper surface of the entire tile 1, and the method includes the following steps:
s1, acquiring a tilt direction and a tilt angle α of the tilted printing medium 1 relative to the moving direction by the tilt detection device 4, as shown in fig. 2, the tilt direction includes a first direction and a second direction, wherein (+) denotes the first direction and (-) denotes the second direction; specifically, in the present embodiment, the inclination angle α is 15 ° or less.
S2, obtaining the size of the ceramic tile according to the known sizeTaking a printing region where the non-inclined printing medium 1 is reflected on the inclined printing medium 1, and taking a printing dot closest to the printing head 3 in the printing region as a starting point Z 0 And the starting point Z is obtained by the printing point positioning module of the control device 7 0 (ii) a The printing head 3 is at the printing start point Z 0 Moving to starting point Z 0 Corresponding non-inclined printing medium 1 printing point jet orifice N 1 In the moving direction and the inclined printing medium starting point Z 0 Correspondingly, as shown in fig. 2.
S3, calculating the time when the printing medium reaches the printing head 3 according to the distance sensor 8 to enable the printing head 3 to be from the starting point Z 0 Start printing, and at a specific speed V Y The relatively inclined printing medium continuously translates towards the inclined printing medium on the opposite side of the inclined printing medium in the direction perpendicular to the moving direction of the inclined printing medium, as shown in fig. 2, in the embodiment, the printing medium inclines towards the first direction, the printing head translates towards the second direction opposite to the first direction, and in the moving process, ink is jetted to the inclined printing medium to form a plurality of jet holes corresponding to the same row of printing points of the non-inclined printing medium, and the ink is sequentially delayed by deltat from the jet hole close to the inclined opposite side to the jet hole close to the inclined side. For illustrative purposes, as shown in FIG. 4, the first row of dot patterns is printed from N 1 After ink is jetted at the time T, the subsequent jet holes sequentially delay to jet ink, the second jet hole jets ink at the time T plus Deltat, the third jet hole jets ink at the time T plus 2 Deltat, and the Deltat is the time interval of delaying to jet ink compared with the last jet hole.
Marking as a reference point A a print dot closest to the print head among each column of print dots reflected on the inclined print medium 1 The reference point of the last column is the final reference point A 1 ', from the final reference point A 1 ' the printing point in the same column and farthest from the final reference point is the tail point A 2 '; the V is Y And Δ t are set according to α, as shown in fig. 3, at least: printing head with V Y During the speed movement, the reference point A is moved 1 Corresponding non-inclined printing medium printing point ink jet orifice and reference point A 1 The printing processes are in one-to-one correspondence so as to realize accurate printing processes; and the print head is at V Y Velocity shifting print forming final referencePoint A 1 ' self-ending reference point A when printing dots corresponding to column 1 ' ink jetting begins, together forming a final reference point A 1 ' the rest of the jet holes corresponding to the columns of printing points are from the final reference point A 1 ' start of corresponding jet orifice is delayed by delta t to jet orifice and tail point A 2 ' correspond.
Specifically, V is shown in this embodiment Y And delta t can be obtained by calculation according to the detected parameters and the known parameters. Acquiring and recording a printing point closest to a printing head in any row of printing points reflected on the inclined printing medium as A 1 Dot, farthest from A among dots printed in the same column 1 The printing point of the dots is A 2 Point, note A 1 Point and point A 2 The distance of the point in the direction perpendicular to the moving direction of the inclined printing medium is omega; in this embodiment, the printing point positioning device and the inclination detection device are combined with the known tile size to obtain the Z in the first row 0 Point and column of same genus farthest from Z 0 Z of a point 1 Dot, the number of a row of jet holes which correspondingly form the same row of printing dots is recorded as N, then the V is Y ＝V X tanα，
And S4, forming the complete pattern on the inclined printing medium, wherein the pattern is not deformed due to the inclination of the printing medium.
In addition to the above printing with the printing medium that is tilted by using the orifices arranged in the same way as the non-tilted printing medium, in this embodiment, the print head includes a plurality of rows of orifices with different pitches or the pitch between the orifices of the print head is adjustable (not shown in the figure), and the pitch between adjacent orifices in the plurality of orifices forming a row of printing dots on the non-tilted printing medium is L 1 Setting a printing head to print printing points closest to the printing head in adjacent rows of printing points of the inclined printing medium before step S3, wherein the time interval of the printing points is delta T '=deltaT cos alpha, and the selected jet hole pitch or the adjusted jet hole pitch is L' 1 ＝V X △T sinα+L 1 cos α, said Δ T is the ink jet spacing for printing adjacent columns of printed dots on an untilted print medium, and L 1 、△TAre all known. Specifically, the geometric relationship is as shown in fig. 5 and 6, and for convenience of representation, fig. 6 shows only a small number of print dots, and the dotted print dots are solid print dots reflected on the print medium after being inclined at an angle α. The effect of printing on the non-inclined printing medium can be more accurately restored through the mode.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (9)
1. A method of printing on a print medium that is tilted using a printhead, wherein the print medium is moved relative to the printhead and is printed while passing the printhead, the printhead forming a plurality of linear rows of dots on the non-tilted print medium perpendicular to the direction of travel of the print medium, the printhead having a plurality of orifices corresponding to the dots to be printed, the method comprising the steps of:
s1, acquiring the inclined state of an inclined printing medium, including an inclined direction and an inclined angle alpha relative to a moving direction;
s2, acquiring printing starting point Z of inclined printing medium 0 ；
S3, printing head self-starting point Z 0 Starting printing, continuously translating towards the opposite side of the incline in the direction perpendicular to the moving direction of the inclined printing medium, and controlling more than one jet orifice to delay ink jet in the direction parallel to the moving direction of the inclined printing medium;
s4, forming the complete pattern on the inclined printing medium, wherein the pattern is not deformed due to the inclination of the printing medium;
the printing medium is ceramic tiles.
2. A method of printing on a print medium that is inclined using a print head as claimed in claim 1, characterized in that the print medium is opposite the print headAt a speed V X Moves and is printed while passing the print head, at a speed V in step S3 Y Continuously translating the relatively inclined printing medium towards the inclined opposite side in the direction perpendicular to the moving direction of the inclined printing medium, and sequentially delaying delta t ink ejection from a plurality of nozzle holes forming a row of printing points of the inclined printing medium to the other side after ink ejection from the nozzle holes close to the inclined opposite side; the V is Y And delta t is set according to alpha.
3. A method of printing on a slanted print medium using a printhead as claimed in claim 2 wherein the print dot closest to the printhead of any column of print dots reflected on the slanted print medium is obtained and recorded as a 1 Dot, farthest from A, of the same column of printed dots 1 The printing point of the dots is A 2 Point, note A 1 Point and point A 2 The distance of the dots in the moving direction of the vertical inclined printing medium is omega, the number of a row of spray holes which correspondingly form a row of printing dots is N, and then the V is Y ＝V X tanα，
4. A method of printing on a print medium that is skewed using a printhead as claimed in claim 3, wherein the printhead includes a plurality of rows of differently spaced orifices or the spacing between the orifices of the printhead is adjustable such that adjacent ones of the plurality of orifices forming a row of print dots on the print medium that is not skewed have a spacing L 1 Setting a printing head to print printing points closest to the printing head in adjacent rows of printing points of the inclined printing medium before step S3, wherein the time interval of the printing points is delta T '=deltaT cos alpha, and the selected jet hole pitch or the adjusted jet hole pitch is L' 1 ＝V X △Tsinα+L 1 cos α, said Δ T being the ink jet spacing between printing dots of adjacent columns of an untilted print medium.
5. A method of printing on a print medium that is tilted using a printhead as claimed in claim 2, wherein the printhead is arranged to print on the print medium in a tilted positionRecording the printing point closest to the nozzle in the printing points corresponding to the last column of the non-inclined printing medium on the inclined printing medium as a final reference point A 1 ', from the final reference point A 1 ' the printing point in the same column and farthest from the final reference point is the tail point A 2 '; in step S3 the print head is driven by V Y Speed moving printing forms a final reference point A 1 ' self-ending reference point A when printing dots corresponding to column 1 ' begin jetting ink, collectively forming a final reference point A 1 ' the rest of the jet holes corresponding to the columns of printing points are from the final reference point A 1 ' start of corresponding jet orifice is delayed by delta t to jet orifice and tail point A 2 ' correspond to.
6. A method of printing on a print medium that is tilted using a print head according to any of claims 1 to 5, wherein the print head is at a print starting point Z in step S3 0 Is translated to the starting point Z 0 And (7) correspondingly.
7. A method of printing on a print medium which is inclined using a print head according to any one of claims 1 to 5 wherein the print point on the inclined print medium which is closest to the print head in each column of print points is taken as reference point A 1 Step S3, in the process of translating the printing head, making the printing head be in the reference point A 1 Matching orifice to reference point A 1 And (4) corresponding to each other.
8. A method of printing on a print medium with a print head that is tilted according to any of claims 1 to 5, wherein the step S2 of obtaining Z reflected on the tilted print medium is based on the tilt angle α of the tilted print medium and the distance of the known print area from the non-tilted print medium boundary 0 Point, at the same time, also obtain and Z 0 Dots belonging to the same row as the printed dot and furthest from Z 0 Z of a point 1 And (4) point.
9. A method of printing on a tilted print medium using a print head according to any one of claims 1 to 5 wherein the distance between the two of the plurality of print dots reflected on the tilted print medium that are farthest apart in the direction of translation of the print head is denoted as D, and the tilt angle of the print medium is tilted such that D is equal to or less than the width of at least one row of orifices of the print head in the direction of translation.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806525.XA CN114074487B (en) | 2020-08-12 | 2020-08-12 | Method for printing on inclined printing medium by using printing head |
| EP21841886.1A EP4180236A4 (en) | 2020-07-13 | 2021-07-12 | Method for printing on inclined printing medium by printing head, and system |
| JP2023502867A JP7508688B2 (en) | 2020-07-13 | 2021-07-12 | Method and system for printing on tilted print media with a print head - Patents.com |
| PCT/CN2021/105844 WO2022012478A1 (en) | 2020-07-13 | 2021-07-12 | Method for printing on inclined printing medium by printing head, and system |
| US18/154,733 US20230150275A1 (en) | 2020-07-13 | 2023-01-13 | Method and system for printing on tilted print medium using printhead |
| JP2024098470A JP2024120015A (en) | 2020-07-13 | 2024-06-19 | Method and system for printing on tilted print media with a print head - Patents.com |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010806525.XA CN114074487B (en) | 2020-08-12 | 2020-08-12 | Method for printing on inclined printing medium by using printing head |
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| CN114074487A CN114074487A (en) | 2022-02-22 |
| CN114074487B true CN114074487B (en) | 2022-12-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0752376A (en) * | 1993-08-19 | 1995-02-28 | Olympus Optical Co Ltd | Multi-nozzle inkjet printer |
| JP3772759B2 (en) * | 2002-02-21 | 2006-05-10 | セイコーエプソン株式会社 | Printing apparatus, printing method, computer program, and computer system |
| DE602005007826D1 (en) * | 2004-10-08 | 2008-08-14 | Brother Ind Ltd | inkjet |
| EP1764224A1 (en) * | 2005-09-20 | 2007-03-21 | Agfa Graphics N.V. | A method and apparatus for digital printing with preservation of the alignment of printed dots under various printing conditions. |
| CN101332707A (en) * | 2007-06-27 | 2008-12-31 | 明基电通股份有限公司 | Inking device and method for rectifying inking |
| JP6971595B2 (en) * | 2017-03-08 | 2021-11-24 | 理想科学工業株式会社 | Image forming device |
| CN108944047B (en) * | 2017-12-26 | 2020-01-24 | 广东聚华印刷显示技术有限公司 | Ink jet printing correction method, device, storage medium and computer equipment |
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