CN213353974U - System for printing on inclined printing medium by using printing head - Google Patents
System for printing on inclined printing medium by using printing head Download PDFInfo
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- CN213353974U CN213353974U CN202021676173.2U CN202021676173U CN213353974U CN 213353974 U CN213353974 U CN 213353974U CN 202021676173 U CN202021676173 U CN 202021676173U CN 213353974 U CN213353974 U CN 213353974U
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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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- 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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Abstract
The invention discloses a system for printing on a printing medium with an inclined printing head, which comprises: the printing head is provided with a plurality of jet holes; an inclination detection device for detecting parameters reflecting the inclination state of the printing medium, including an inclination angle and an inclination direction; 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 controls the jet orifice of the printing head to delay ink jet; the control device comprises a printing point positioning module, the printing point positioning module at least obtains an ink jet starting point of the inclined printing medium, the control device controls the printing head to translate through the translation driving device, and the time delay control device controls the time delay ink jet of the jet orifice of the printing head. The printing medium can be printed to form a complete and non-deformable pattern on the inclined printing medium, thereby reducing the generation of waste products, fully utilizing the existing materials and improving the yield. And compare in artifical adjustment, great promotion production efficiency.
Description
Technical Field
The present invention relates to the field of printing, and more particularly, to a system for printing on a print medium that is inclined using a print head.
Background
In order to meet the requirement of people on aesthetic feeling in modern society, patterns are processed in the production process of a plurality of products, so that the finished products have ornamental value. The common pattern processing mode in the prior art is the printing mode, and a product is conveyed to a printing head on a production line to be printed, and has a basic pattern after passing through the printing head. Such as ceramic tiles, are printed after being transported to the print head in the production line, and the basic formation of the pattern 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 tile printing process, 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 formed by the printing head and corresponding to the printing medium which is not inclined does not correspond to the inclined printing medium, and the product formed on the basis of the inclined printing medium shows the condition that the pattern is deformed 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 system capable of printing on an inclined printing medium, which can avoid the disadvantages caused by manual adjustment and can print a reduction pattern effect on the inclined printing medium.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming above-mentioned prior art's at least not enough, provide an use and beat the system that printer head printed on the print media that takes place the slope, do not need manual adjustment can print on the print media that takes place the slope, and the pattern that forms of printing is complete, indeformable, has reduced the possibility that the waste product produced, has still guaranteed production efficiency simultaneously.
The utility model provides a technical scheme be, a system that the printing head was beaten in use and is printed on the print media who takes place the slope, include:
a print head on which a print medium moves relative to the print head and is printed while passing the print head, the print head having a plurality of orifices for printing a plurality of linear rows of print dots on an untilted print medium,
a skew detection device that detects parameters reflecting a skew state of the printing medium including a skew direction of the skewed printing medium with respect to a moving direction of the printing medium and a skew angle α;
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 connected with the printing head and is used for controlling the jet orifice of the printing head to jet ink in a time delay manner;
a control device including a print dot positioning module for acquiring at least a print dot Z of the inclined print medium closest to the print head in the moving direction0The control device is connected with the inclination detection device, the translation driving device and the time delay control device, controls the printing head to translate through the translation driving device, and controls more than one jet orifice in the printing head to delay ink jet through the time delay control device.
The control device controls the translation driving device to jet ink from a starting point and then drive the printing head to continuously translate towards the inclined opposite side according to the data acquired by the inclination detection device and the printing point positioning module, and simultaneously controls more than one jet orifice in a plurality of jet orifices forming a row of printing points of the non-inclined printing medium to jet ink in a delayed manner through the delay control device, so that the printing points corresponding to the inclined printing medium are formed. And continuously translating the printing head and printing simultaneously until the complete pattern is printed on the inclined printing medium, and the pattern is not deformed due to inclination.
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 detection device comprises an image recognition device or a distance measurement sensor, the distance measurement sensor can obtain the inclination direction and angle by combining with the calculation of the geometric relation, for example, a rectangular printing medium of which the upper surface is required to be completely covered by a pattern is obtained, the distance measurement sensor obtains the distance between a first moment and the sensor and the distance between a second moment and the sensor at one side of the printing medium, and the inclination direction and angle can be obtained by combining with the moving speed of the printing medium. Obtaining 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.
The printing head forms patterns on the printing area of the non-inclined printing medium, so in order to enable the inclined printing medium to have basically consistent effect after being printed, the printing area reflected on the inclined printing medium needs to be obtained based on the known distribution of the printing area of the non-inclined printing medium, and as the printing area and the size of the printing medium of the same product are basically unchanged, the printing area of the inclined printing medium can be obtained by utilizing the geometric relationship based on the inclined direction and the inclined angle, and the printing area is also helpful for obtaining the printing point Z closest to the printing head in the printing area0(ii) a Help at the starting point Z0Immediately starting printing when entering the ink-jet range of the printing head, and preventing the starting point Z from being missed0Missing part patterns or printing area deviation; the printing point positioning device obtains the starting point Z by the mode0. 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 an angular point of the square area which is closest to the printing head after the square area is inclined;
the translation controlled by the translation driving device is the translation of the printing head relative to the printing medium in the direction vertical 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 taken as a printing point and the printing head is continuously moved in a direction vertical to the moving direction of the printing medium, so that 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 pattern is only deformed by the translation alone, for example, if a square pattern is printed on a rectangular non-inclined printing medium, after the printing medium is inclined, although the translation can cause the printing area reflected on the inclined printing medium to be printed, the printed pattern is a parallelogram which shows a missing part on the rectangular printing medium, and the pattern is deformed and is incomplete. When the printing medium is inclined, each row of printing points formed by printing on the non-inclined printing medium is also inclined substantially, that is, 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 through a delay control device, and more than one jet hole is arranged 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.
The printing head continuously translates in the direction vertical to the moving direction of the printing medium after printing is started 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 a non-inclined 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.
The utility model not only can overcome the problem that the printing medium can not be printed to form a product after being inclined in the production process of the prior art, but also can basically restore the complete and non-deformable pattern on the inclined printing medium without manually adjusting the printing medium; the production efficiency is ensured, and meanwhile, the possibility of waste products is reduced. And simultaneously, the utility model discloses do not need complicated mechanical structure, can guarantee to beat the response speed of printer head to reach accurate control inkjet, also can avoid occupying great space, make it use in dropping into each production environment more easily. 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 by the system and is combined with the circuit control to complete the printing on the inclined printing medium, so that the cost for solving the problems is further reduced.
Further, the print medium is at a velocity V relative to the printheadXMoving and being printed while passing by the print head, the translation drive controlling the print head at a speed VYThe relative inclined printing medium continuously translates towards the inclined opposite side in the direction perpendicular to the moving direction of the inclined printing medium, the time delay control device at least controls a plurality of jet holes forming a row of printing points in the printing head to sequentially delay delta t ink jet from the jet hole at one end to the jet hole at the other end, namely the plurality of jet holes forming the row of printing points of the inclined printing medium sequentially delay delta t ink jet from the jet hole at one end close to the inclined opposite side to the jet hole at the other end close to the inclined opposite side; the V isYAnd delta t is set according to alpha. One of the delayed ink jetting modes is that the ink is jetted from the jet holes near the inclined opposite side to the jet holes near the inclined side in a delayed mode delta t, so that the jet holes can jet ink on corresponding rows in sequence, and the patterns are 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, … and the Nth spray hole are arranged from top to bottom, after the first spray hole sprays ink at the time T, the second spray hole sprays ink at the time T plus delta T, the Nth spray hole sprays ink at the time T plus (N-1) delta T, and the N spray holes spray ink to form a row of inclined printing points. More importantly, the length of time that the ink is ejected depends on the printing because of the actual distance the printhead is moved and how much it is extended in the direction opposite to the direction of movementAngle of the medium after tilting, so that the printed pattern is complete and not deformed, VYAnd delta t is set according to alpha.
Furthermore, the printing point positioning module is combined with the inclination detection device to detect the distribution of the known printing area on the non-inclined printing medium to acquire printing points at two ends in any row of printing points and the distance omega of the printing points at two ends in the direction perpendicular to the moving direction of the printing medium, the control device acquires the number N of corresponding spray holes forming the corresponding row of printing points and sets VY＝VXtanα、
Let A be the print dot closest to the print head among a print dot in an arbitrary line reflected on the inclined print medium1Dot, farthest from A among dots printed in the same column1The printing point of the dots is A2Point, note A1Point and point A2The distance of the dots in the moving direction of the vertical inclined printing medium is omega, the number of the spraying holes in one row which correspondingly form the same row of printing dots is N, and then the V isY＝VXtana，
Taking a printing rectangular area as an example, taking the printing head to form the jet orifice N corresponding to each row of printing points closest to the printing head in a plurality of jet orifices corresponding to the printing points1By reference, printing a dot Z closest to the print head in its translation to eject the first column0To the last column of ink jets closest to the print head to print dot A1In the process of `, Z0And A1' distance in translation direction is d1And at this time d1Print area Z0The length of the corresponding side is multiplied by sin alpha; while substantially moving the print zone Z in the print medium moving direction0The distance of the corresponding side length x cos alpha, the print head is moved from Z0Is translated to A1Time of
Therefore, it is not only easy to use
At this time, the starting point Z in the dots printed in the first column0Represents A1First column of dots, last dot Z1Represents A2At this time point Z1Corresponding orifice compared to point Z0Delay t required for ink jetting corresponding to jet hole2The time can correspond exactly to the last printed dot in the oblique column of printed dots. Due to Z0And Z1A distance d in the moving direction of the printing medium2ω × sin α, then
At the same time, because the printing points in the same row are arranged at equal intervals, Z0To Z1Corresponding N spray holes from Z0After ink is jetted, the ink is sequentially delayed by delta t
And because no other columns of print dots are involved, dot A is printed according to any one column1、A2Thus obtaining the delta t.
To simplify the apparatus the print head may print on inclined print media with orifices that print dots in the same column of the non-inclined print media. Alternatively, the inclined print medium may be printed using orifices having a different pitch than the original non-inclined print medium, according to the rules specified by the above formula. Further, A of the first column or the last column is obtained1Dot, A2Points to calculate and set VYAnd 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 L1The control device sets the printing head to print the printing point closest to the printing head in the adjacent rows of printing points of the inclined printing medium according to the data acquired by the inclination detection device and the printing point positioning moduleThe time interval is DeltaT ═ DeltaTcos alpha, and the selected injection hole pitch or the adjusted injection hole pitch is L'1＝VX△Tsinα+L1cos 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 L1And basically no visually perceptible error is generated under the condition that the inclination angle is smaller when the ink-jet interval delta T of the printing points of each row of printing points close to the printing head is not changed; when the inclination angle is large, there may be a situation where the position to be printed is located between two nozzles, and if the upper or lower nozzle is used to print the dot, a visible error may be generated at the edge position 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 the larger inclination angle is reduced while the printing width is ensured.
Furthermore, the printing head is provided with a space L between adjacent jet holes1Different multi-row spray holes or adjacent spray hole spacing L1The adjustable more than one row of jet 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 jet orifices in the ink-jet mode after inclination, so that errors are generated. Taking a rectangular tile to be completely covered by a pattern as an example, the first row of printing points is recorded as Col1The second row of printing points is Col2The printing points of the same row from the nearest printing head to the farthest printing head are sequentially N1、N2、…、NNThen Col1-N1With Col2-N1Is a distance of l1The distance between two points after tilting is l2The angle of inclination is alpha, and l1＝VX△T，l1And l2Equal, original printing medium matched with printing head in ink-jet Col1-N1Post-shift to print Col2-N1Is a distance l in the moving direction of the printing medium1And after tilting, the print head ejects ink Col1-N1Translating to Col2-N1The distance in the moving direction of the printing medium in the process isl2cos α, due to Δ T' VX＝l2cos α, then Δ T ═ Δ Tcos 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 Col1-N1Is moved to Col2-N1When ink is jetted, the original Col is corresponded at this time1-N2When the time delay of the jet hole corresponds to Col1-N2Ink jet, then spacing between adjacent orifices L'1Need to be equal to Col1-N2With Col2-N1Distance in the direction of translation of the print head, then L 'can be calculated at this time using the geometric relationship'1＝VX△T’tanα+L1cosα＝VX△Tsinα+L1cos α, wherein L1And corresponding to the distance between adjacent jet holes in the plurality of jet holes when the original printing medium is not inclined. The Col1-N1I.e. the starting point closest to the print head among the first series of print points closest to the print head.
Further, the printing point positioning module acquires the printing points on the inclined printing medium, which are closest to the printing head, according to the detection data of the inclination detection device and the distribution of the known printing areas on the non-inclined printing medium. For example, the tilt detection device can obtain a first time when the distance suddenly changes and a second time and a third time when the subsequent distance continuously changes, and the first time is the time when the printing medium reaches the position of the tilt detection device, and combines the distance measurement result of the second time and the third time, the time interval and the VXThe tilt angle and tilt direction can be obtained. Meanwhile, the printing point positioning device calculates the moving distance of the printing medium from the first moment to the third moment, and calculates the printing area reflected on the inclined printing medium by combining the detection data of the inclined detection device and the distribution of the printing area in the non-inclined printing medium, thereby obtaining the ink jet starting point Z0. The distribution of print areas in the untilted print medium comprises the distance of the print areas relative to the side of the print medium.
Furthermore, the control device controls the printing head to move to and start from the printing device through the translation driving device according to the data acquired by the printing point positioning moduleThe starting point corresponds. 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 printing medium that takes place the slope can still produce the position change, so the utility model discloses a beat print head translation to corresponding orifice and initial point and correspond at the moving direction through translation drive arrangement drive after print a positioner obtains the initial point, help the printing medium to remove and just can begin to print at once after getting into the printing range, avoid aiming at Z temporarily0The gap time is fully utilized to improve the printing efficiency.
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 A1', from the final reference point A1' the printing point in the same column and farthest from the final reference point is the tail point A2'; the printing point positioning module acquires a final reference point A1' and end point A2'; control means controls the print head to VYSpeed moving printing forming terminal reference point A1' self-ending reference point A when printing dots in corresponding column1' ink jetting begins, together forming a final reference point A1' the rest of the jet holes corresponding to the columns of printing points are from the final reference point A1' start of corresponding jet orifice is delayed by delta t to jet orifice and tail point A2' correspond to. 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 final ink jetting corresponds to the final 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, and patterns printed on the inclined printing medium are printed in an inclined mode relative to the inclined printingThe distribution of the print medium is the same as the distribution of the pattern on the untilted print medium, ensuring the integrity and non-deformation of the pattern. 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 easily obtained by combining known inclination angle α, printing area size and distribution calculation, so that the translation speed and Δ t of the printing head can be conveniently calculated, and ink is jetted from the final reference point at the end of printing and is delayed to be jetted 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 dot location module is based on the distribution of the print area on the known untilted print medium and VXCalculating to obtain the printing point closest to the printing head in each row of printing points on the inclined printing medium, and recording as a reference point A1The control device controls the print head to VYMaking a reference point A in the process of speed translation1Corresponding non-inclined printing medium printing point ink jet orifice and reference point A1And correspond to each other. In the process of forming a plurality of rows of printing points by translation, printing is started from the printing point closest to the printing head in each row every time, so that missing printing is prevented, accurate printing on the boundary of one side of a printing area is realized, and the boundary is conveniently used for providing a reference for ink jetting of other jet holes; 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 inclination detecting device includes one or more correlation distance measuring sensors provided in the moving direction of the printing medium. Through correlation distance measuring sensor, besides conveniently detect inclination direction and inclination angle, still be favorable to instant detection print media position, provide the data basis for printing some location module. E.g. when the print medium is moved to the shielded correlation distance measuring sensor, the inclination direction, inclination angle, known distribution of the print area of the non-inclined print medium and V obtained in connection with the subsequent detection at this timeXThe print point positioning module can calculateLocation starting point Z0。
Further, the printing medium is ceramic tiles. When the inclined printing system 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, the printing point positioning module obtains a starting point Z0A printing point Z which belongs to the same row and is farthest from the starting point1And the distance between two points. Namely, the points at the two ends of the boundary of the printing area are obtained, so that the calculation of the printing point positioning module is convenient. Z compared to acquiring other columns of printed dots on the print medium0Point Z1The 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 among 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 to a specific angle so that the 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 spray 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 the row of spray holes in the translation direction; taking the above-mentioned rectangular printing area as an example, D is D1+ ω. The printing head comprises a plurality of nozzles, the spray holes are arranged on the nozzles, and the plurality of nozzles and the corresponding spray holes form more than one row of spray holes on 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, d1Beat-to-beatPrint zone Z0The length of the corresponding side edge x sin alpha is smaller than the width of one nozzle, when the printing head is composed of 1536 nozzles, the width of the 1536 nozzle in the direction perpendicular 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 d1≤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 holes, and is beneficial to simplifying a control circuit. Such as rectangular, square, and trapezoidal, which gradually narrows in the 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 by regular printing medium calculation, and when the printing area covers the whole printing medium, the inclination angle and the inclination direction of the printing medium can be obtained by combining a simple distance measuring instrument and 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 a skewed print medium.
Furthermore, the system also comprises a distance sensor which is connected with the control device and is used for sensing the position of the inclined printing medium relative to the printing head at a certain time interval or a certain moment before printing, and the distance sensor can feed back the distance between the printing medium and the printing head, thereby being convenient to use based on VXCalculating the alignment Z of the print head in the direction of travel of the print medium0When to begin to jet ink downwards on the premise of (1), the ink jet control device is favorable for accurately controlling ink jet, thereby improving the printing precision.
Compared with the prior art, the beneficial effects of the utility model are that: the printing strategy can be automatically adjusted for the printing medium with the inclination, even if the printing medium is inclined, the printing effect which is the same as that of the printing medium without the inclination can be basically restored on the inclined printing medium, and 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 pattern restoration. 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 to 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 an untilted print medium.
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 of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of 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, the present embodiment discloses a system for 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 3XMoving and printing when passing through the printing head 3, wherein the printing head 3 forms a plurality of rows of printing points which are vertical to the moving direction of the printing medium and are linear and equidistant on the non-inclined printing medium, and the printing head 3 is provided with a plurality of rows of spray orifices 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 3 is also 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 a printing point positioning module is arranged in the control device 7. 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.
The inclination detecting device 4 acquires the inclination direction and the inclination angle α of the inclined printing medium 1 with respect to the moving direction, as shown in fig. 2, the inclination direction includes a first direction and a second direction, in which (+) denotes the first direction and (-) denotes the second direction; specifically, in the present embodiment, the inclination angle α is 15 ° or less. The printing point positioning module in the control device 7 calculates and obtains a printing area of the untilted printing medium 1 reflected on the tilted printing medium 1 according to the known tile size and the detection data of the tilt detection device 4, and positions the printing point closest to the printing head 3 in the printing area as a starting point Z0(ii) a The control device 7 drives the print head at the printing starting point Z by the translation drive device 50Moving to starting point Z0Corresponding non-inclined printing medium 1 printing point jet orifice N1In the moving direction and the inclined printing medium starting point Z0Correspondingly, as shown in fig. 2.
The control device 7 combines the detection result of the inclination detection device 4 and the printing point positioning module data to calculate the time of the printing medium reaching the printing headMaking the printing head self-start point Z0Starts printing and at a specific speed VYThe relatively inclined printing medium continuously translates towards the inclined printing medium on the opposite side 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, the control device 7 controls the ink jetting towards the inclined printing medium through the time delay control device 6 to form a plurality of jet holes corresponding to the same row of printing points of the non-inclined printing medium to sequentially delay delta t ink jetting from the jet hole close to the inclined opposite side to the jet hole close to the inclined side; for convenience, as shown in fig. 4, when the first row of printing dot patterns are formed, the first nozzle hole N is formed1After 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 medium1The reference point of the last column is the final reference point A1', from the final reference point A1' the printing point in the same column and farthest from the final reference point is the tail point A2'; the V isYAnd Δ t are set according to α, as shown in fig. 3, at least: printing head with VYDuring the speed movement, the reference point A is moved1Jet orifice N for printing dot ink jet of corresponding non-inclined printing medium1With reference point A1One-to-one correspondence is adopted to realize an accurate printing process; and the print head is driven by VYSpeed moving printing forming terminal reference point A1' self-ending reference point A when printing dots in corresponding column1' ink jetting begins, together forming a final reference point A1' the rest of the jet holes corresponding to the columns of printing points are from the final reference point A1' start of corresponding jet orifice is delayed by delta t to jet orifice and tail point A2' correspond to.
Specifically, V is shown in this embodimentYAnd delta t can be obtained by calculation according to the detected parameters and the known parameters. Acquiring and recording arbitrary data reflected on an inclined printing mediumThe print dot closest to the print head in a column of print dots is A1Dot, farthest from A among dots printed in the same column1The printing point of the dots is A2Point, note A1Point and point A2The 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 4 are combined with the known tile size to obtain the Z in the first row0Point and column of same genus farthest from Z0Z of a point1Point, the number of a row of jet holes corresponding to the printing point of the same row is recorded as N, then the V isY＝VXtanα，
More specifically, the print head 3 in this embodiment includes a plurality of rows of nozzles with different pitches or the pitch between the nozzles of the print head is adjustable (not shown), and the pitch between adjacent nozzles in the plurality of nozzles forming a row of printing dots on the non-inclined print medium is denoted as L1The control device sets the printing point time interval which is closest to the printing head in the printing points of the adjacent rows of the printing medium printed by the printing head to be delta T '═ delta Tcos alpha according to the data acquired by the inclination detection device and the printing point positioning module, and selects the jet hole spacing or adjusts the jet hole spacing to be L'1＝VX△Tsinα+L1cos α, said Δ T is the ink jet spacing for printing adjacent columns of printed dots on an untilted print medium, and L1And Δ T are 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. By the method, the effect of printing on the non-inclined printing medium can be more accurately restored.
The printing head continuously translates until the printing of the pattern on the printing medium with the inclination is finished, and the pattern is not deformed due to the inclination of the printing medium, so that the same printing effect as that on the printing medium without the inclination is realized.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. A system for printing on a print medium that is skewed using a printhead, comprising:
the printing head is provided with a plurality of jet holes, and the plurality of jet holes print a plurality of rows of linear printing points on the printing medium which is not inclined;
a skew detection device that detects parameters reflecting a skew state of the printing medium including a skew direction of the skewed printing medium with respect to a moving direction of the printing medium and a skew angle α;
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 controls the jet orifice of the printing head to delay ink jet;
the control device comprises a printing point positioning module which at least acquires an ink jet starting point Z of the inclined printing medium0The control device is connected with the inclination detection device, the translation driving device and the time delay control device, controls the printing head to translate through the translation driving device, and controls more than one jet hole in the printing head to jet ink in a time delay manner through the time delay control device.
2. A system for printing on a print medium that is tilted using a printhead as in claim 1, wherein the print medium is at a velocity V relative to the printheadXMoving and being printed while passing by the print head, the translation drive controlling the print head at a speed VYThe relatively inclined printing medium continuously translates towards the inclined opposite side in the direction perpendicular to the moving direction of the inclined printing medium, and a plurality of jet holes forming a column of printing points of the inclined printing medium sequentially delay from ink jetting close to the jet holes at the inclined opposite side to the other sideΔ t ink jetting; the V isYΔ t is set according to α.
3. The system of claim 2, wherein the print dot placement module combines the tilt detection device to detect the data, the distribution of the known print area on the non-tilted print medium to obtain the end-to-end print dots in any one of the columns of print dots and the distance ω between the end-to-end print dots in the direction perpendicular to the moving direction of the print medium, and the control device obtains the number N of corresponding orifices forming the corresponding column of print dots and sets VY＝VXtanα、
4. The system of claim 3, wherein the printhead includes a plurality of rows of orifices having different pitches or the pitch between the orifices of the printhead is adjustable to provide a row of print dots on the non-skewed print media with adjacent orifices spaced at a pitch L1The control device sets the printing point time interval which is closest to the printing head in the printing points of the adjacent rows of the printing medium printed by the printing head to be delta T '═ delta Tcos alpha according to the data acquired by the inclination detection device and the printing point positioning module, and selects the jet hole spacing or adjusts the jet hole spacing to be L'1＝VXΔTsinα+L1cos α, Δ T is the ink jet spacing for printing dots printed in adjacent columns of non-skewed print media.
5. The system of claim 1, wherein the print dot positioning module obtains a print dot closest to the print head on the tilted print medium as an ink ejection starting point Z based on the tilt detection device and the distribution of the known print area on the non-tilted print medium0。
6. A system for printing on a print medium with a print head tilted according to any of claims 1 to 5 wherein the control means controls the print head to translate to the starting point Z by the translation drive means based on the data obtained by the print spot positioning module0And (7) corresponding.
7. A system for printing on a skewed print medium using a printhead as in any of claims 1 to 5, wherein the closest print dot to the printhead in each column of print dots on the skewed print medium is designated as reference point A1The control device controls the print head to VYMaking reference point A during speed translation1Matching orifice to reference point A1And correspond to each other.
8. A system for printing on a print medium that is inclined using a printhead as claimed in any one of claims 1 to 5, wherein the print medium is a tile.
9. The system of any one of claims 1 to 5, wherein the print spot positioning module obtains a starting point Z0A printing point Z which belongs to the same row and is farthest from the starting point1And the distance between two points.
10. The system according to any one of claims 1 to 5, wherein the distance between two printing points which are farthest away in the translation direction of the printing head among the plurality of printing points reflected on the inclined printing medium is represented as D, and the inclined printing medium is inclined at an angle smaller than or equal to a specific angle so that D is smaller than or equal to the width of at least one row of nozzle holes of the printing head in the translation direction.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021676173.2U CN213353974U (en) | 2020-08-12 | 2020-08-12 | System 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021676173.2U CN213353974U (en) | 2020-08-12 | 2020-08-12 | System for printing on inclined printing medium by using printing head |
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| CN213353974U true CN213353974U (en) | 2021-06-04 |
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| CN202021676173.2U Active CN213353974U (en) | 2020-07-13 | 2020-08-12 | System for printing on inclined printing medium by using printing head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022012478A1 (en) * | 2020-07-13 | 2022-01-20 | 广州精陶机电设备有限公司 | Method for printing on inclined printing medium by printing head, and system |
| CN114260577A (en) * | 2021-12-03 | 2022-04-01 | 青岛海尔电冰箱有限公司 | Refrigerator laser coding system and control method thereof |
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2020
- 2020-08-12 CN CN202021676173.2U patent/CN213353974U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022012478A1 (en) * | 2020-07-13 | 2022-01-20 | 广州精陶机电设备有限公司 | Method for printing on inclined printing medium by printing head, and system |
| CN114260577A (en) * | 2021-12-03 | 2022-04-01 | 青岛海尔电冰箱有限公司 | Refrigerator laser coding system and control method thereof |
| CN114260577B (en) * | 2021-12-03 | 2024-01-05 | 重庆海尔制冷电器有限公司 | Refrigerator laser coding system and control method thereof |
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