CN114379228B - Cylindrical surface printing control method, device, printer and storage medium - Google Patents

Cylindrical surface printing control method, device, printer and storage medium Download PDF

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Publication number
CN114379228B
CN114379228B CN202011110104.XA CN202011110104A CN114379228B CN 114379228 B CN114379228 B CN 114379228B CN 202011110104 A CN202011110104 A CN 202011110104A CN 114379228 B CN114379228 B CN 114379228B
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image
printing
ink
precision
printed
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CN114379228A (en
Inventor
任建平
谢尧斌
黄中琨
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Senda Shenzhen Technology Co Ltd
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Senda Shenzhen Technology Co Ltd
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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
    • 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
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • 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
    • B41J2/135—Nozzles
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging
    • 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
    • B41J2/2142—Detection of malfunctioning nozzles
    • 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
    • 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
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • 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
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors

Abstract

The invention discloses a cylindrical surface printing control method and device, a printer and a storage medium, and relates to the technical field of ink-jet printing. The method comprises the following steps: acquiring the printing precision of the spray head and the image precision of an image to be printed in the axial direction of the cylinder; when the printing precision is smaller than the image precision in the axial direction, inserting at least one ink dot between every two adjacent ink dots in the image axial direction after printing the image on the cylindrical surface; and when the printing precision is larger than or equal to the image precision in the axial direction, controlling the nozzles to print the image in groups according to the preset nozzle ink discharging mode. According to the invention, in the cylindrical surface printing, the method of inserting ink dots or controlling the nozzles to print in groups is adopted according to the printing precision of the nozzle and the image precision of the printed image in the cylindrical axial direction, so that the problem of poor printing effect caused by insufficient printing precision of the nozzle, higher rotation speed of a cylindrical printing medium and the like in the cylindrical surface printing is solved, and the printing quality is improved.

Description

Cylindrical surface printing control method, device, printer and storage medium
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to a cylindrical surface printing control method and device, a printer and a storage medium.
Background
The cylindrical object ink-jet printer refers to a device for printing patterns on a cylindrical surface by using an ink-jet mode, and the printed products include but are not limited to: wine bottles, vacuum cups, metal tubes, glasses, paper cups, flexible materials, and the like. In the printing process, a cylindrical object to be printed is driven by a rolling shaft of the printer to rotate at a constant speed along a rotating central shaft at a certain angular speed, and ink sprayed by the spray head is printed on the cylindrical surface of the object.
In various cylindrical surface printing applications, on one hand, different printing objects have different printing precision requirements, some require high precision of printing images, and some require low printing precision, if the printing precision of the previous printing task is lower, and the printing precision required by the next printing task is high, then the nozzle with higher precision needs to be replaced for printing, otherwise, the printing effect is poor. On the other hand, when printing a high-precision image at high speed, since the distance between dots ejected from the head is very small, if the speed of rotation of the cylindrical object is fast, the spread of dots ejected onto the cylindrical surface becomes large, the mutual influence between dots becomes large, and the printing effect becomes poor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling printing on a cylindrical surface, a printer, and a storage medium, so as to solve the technical problem of poor printing effect caused by insufficient precision of a nozzle and fast rotation speed in printing on a cylindrical surface.
In a first aspect, an embodiment of the present invention provides a cylindrical surface printing control method, including:
acquiring the printing precision of a spray head and the axial image precision of an image to be printed;
when the printing precision is smaller than the image precision in the axial direction, inserting at least one ink dot between every two adjacent ink dots in the axial direction of the printed image after the image is printed on the cylindrical surface;
and when the printing precision is equal to the image precision in the axial direction, grouping the nozzles according to a preset ink discharging mode to print the image.
Preferably, when the printing accuracy is less than the image accuracy in the axial direction, inserting at least one dot between all adjacent two dots in the axial direction of the printed image after printing the image on the cylindrical surface, includes:
when the printing precision is smaller than the axial image precision, determining the number of ink dots inserted between two adjacent ink dots in the axial direction of the printed image according to the printing precision and the axial image precision, and recording the number as n, wherein n is an integer greater than or equal to 1;
acquiring the insertion position of each time when the ink dot is inserted;
inserting n dots between all adjacent two dots in the axial direction of the image according to the insertion position.
Preferably, the obtaining of the insertion position of each dot insertion includes:
acquiring the distance between two ink dots in the axial direction of the image;
and acquiring the insertion position of each insertion of the ink dots according to the distance and the number n of the inserted ink dots.
Preferably, the inserting n dots between all adjacent two dots in the axial direction of the printed image according to the insertion position includes:
printing the image when the cylindrical printing medium rotates for a first circle;
inserting a dot in the printed image once every time the cylindrical printing medium completes one rotation according to the insertion position until the insertion of the nth dot is completed.
Preferably, when the printing precision is greater than or equal to the image precision in the axial direction, controlling the nozzles to print the image in groups according to a preset ink discharging mode, and the method includes:
when the cylindrical printing medium rotates for a first circle, controlling the first nozzle group to discharge ink to print the image;
controlling a UV lamp to carry out ink point curing on the image which is printed on the cylindrical surface by the first nozzle group;
controlling the second nozzle group to discharge ink to print the image when the cylindrical printing medium rotates for the second circle;
controlling the UV lamp to carry out ink point curing on the image which is printed on the cylindrical surface by the ink discharged from the second nozzle group;
and the rest is repeated until all the nozzle groups finish ink discharging printing and ink dot curing.
Wherein, the preset ink outlet mode is as follows: dividing all nozzles in the sprayer into m nozzle groups according to the height direction of the sprayer, wherein m is a natural number greater than 1, and m-1 nozzles are arranged between every two adjacent nozzles in each nozzle group.
Preferably, the cylindrical surface printing control method further includes:
the firing frequency of the head is determined according to the accuracy of the image to be printed in the circumferential direction of the cylinder, the radius of the cylinder, and the angular velocity of the rotation of the cylinder.
Preferably, the cylindrical surface printing control method further includes:
acquiring circumferential printing precision when an image is printed by using the ignition frequency according to the ignition frequency of the nozzle;
when the printing precision of the circumferential direction is less than the image precision of the circumferential direction, after the image is printed on the cylindrical surface, at least one ink dot is inserted between all adjacent two ink dots in the circumferential direction of the printed image.
In a second aspect, an embodiment of the present invention provides a cylindrical surface printing control apparatus, including:
the acquisition module is used for acquiring the printing precision of the spray head and the image precision of an image to be printed in the axial direction of the cylinder;
the ink dot inserting module is used for inserting at least one ink dot between every two adjacent ink dots in the axial direction of the printed image after the image is printed on the cylindrical surface when the printing precision is smaller than the image precision in the axial direction;
and the nozzle grouping printing module is used for controlling the nozzles to print the image in groups according to a preset nozzle ink outlet mode when the printing precision printing is equal to the axial graph precision.
In a third aspect, an embodiment of the present invention provides a printer, including: at least one processor, at least one memory, and computer program instructions stored in the memory that, when executed by the processor, implement the method of any of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a storage medium, on which computer program instructions are stored, wherein when the computer program instructions are executed by a processor, the method according to any one of the first aspect is implemented.
In conclusion, the beneficial effects of the invention are as follows:
according to the cylindrical surface printing control method, the cylindrical surface printing control device, the printer and the storage medium, the method of inserting ink dots or controlling nozzles to print in groups is adopted according to the printing precision of the spray head and the image precision of a printed image in the cylindrical axial direction in the cylindrical surface printing, the problem of poor printing effect caused by insufficient printing precision of the spray head, high rotating speed of the cylindrical printing medium and the like in the cylindrical surface printing is solved, and the printing quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a cylindrical surface printing control method according to an embodiment of the present invention.
Fig. 2a is a schematic illustration of cylindrical surface printing according to an embodiment of the present invention.
Fig. 2b is a bottom view of the print carriage of fig. 2 a.
Fig. 3 is a schematic diagram of dot insertion in the cylindrical surface printing control method according to the embodiment of the present invention.
Fig. 4a is a schematic diagram of a control nozzle group of the cylindrical surface printing control method of the embodiment of the present invention.
Fig. 4b is a schematic diagram of the printing effect of the first nozzle group in fig. 4 a.
Fig. 4c is a schematic diagram of the printing effect of the second nozzle set in fig. 4 a.
Fig. 5 is a schematic configuration diagram of a cylindrical surface printing control apparatus of an embodiment of the present invention.
Fig. 6 is a schematic configuration diagram of a cylindrical surface printing control printer according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" comprises 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides a cylindrical surface printing control method which is suitable for an ink-jet printer for cylindrical articles. Wherein the cylindrical object includes but is not limited to a pen, a cup, etc. The printer is preferably a cylindrical article inkjet printer capable of printing high precision images at high speed. The printer includes: at least one spray head, the spray head comprising at least one row of nozzles; a spray head control module for controlling the work of the spray head, a control panel for controlling the work of the printer and the like.
To facilitate this discussion, the following explanation is made:
the image precision of the axial direction of the image refers to the number of ink dots printed per inch of the image in the axial direction of the cylinder;
image accuracy in the circumferential direction of the image: refers to the number of ink dots per inch printed by the image in the circumferential direction of the cylinder;
printing precision of the nozzle: the number of ink dots which can be printed per inch by the spray head is printed by scanning once;
ignition frequency: refers to the number of dots that can be ejected from each orifice in the head per second.
Referring to fig. 1, an embodiment of the present invention provides a cylindrical surface printing control method, including the following steps:
s1: acquiring the printing precision of a nozzle and the image precision of an image to be printed in the axial direction;
as shown in fig. 2a, the head carriage 1 is mounted on the cross beam 2, the cylindrical printing medium 3 is rotated around the central axis direction L1 below the head carriage 1, and the heads mounted on the head carriage 1 perform ink ejection to print an image 4 on a cylindrical surface. The direction of L2 is the cylindrical circumference, the arrangement mode of the spray heads on the spray head trolley 1 is shown in figure 2b, and the spray head trolley 1 comprises two spray heads. Obviously, the spray heads may be arranged closely or with a certain spacing.
The printing precision of the nozzle refers to the number of printable dots per inch, and is marked as P1.
The image accuracy of an image to be printed on a cylindrical surface is divided into an image accuracy in a cylindrical axial direction (L1) and an image accuracy in a cylindrical circumferential direction (L2). The image accuracy in the axial direction refers to the number of dots printed per inch in the axial direction, and is denoted as P2.
Before printing is started, the printing precision of the spray head and the image precision of the axial direction of the image to be printed are obtained through the step S1, and an appropriate printing mode is determined according to the printing precision and the image precision of the axial direction.
S2: when the printing precision is smaller than the image precision in the axial direction, inserting at least one ink dot between every two adjacent ink dots in the axial direction of the printed image after the image is printed on the cylindrical surface;
when the printing precision is smaller than the image precision in the axial direction, the number of ink dots ejected by the nozzle in each inch of length is smaller than the number of ink dots to be printed in the axial direction of the image to be printed. In the step, after the cylindrical printing medium rotates for the first circle to print the image, a plurality of ink dots are inserted among the ink dots of the printed image, so that the finally printed image meets the precision requirement. Specifically, step S2 further includes:
s21: determining the number of inserted ink dots between two adjacent ink dots in the axial direction of the image according to the printing precision and the image precision, wherein the number is marked as n, and n is an integer greater than or equal to 1;
specifically, before inserting the dots, the number of dots to be inserted needs to be acquired first. Since P2 is greater than P1, dividing P2 by P1,
when the integer division is possible, the value of n is P2/P1-1;
when the division is not complete, the value of n is an integer value of P2/P1, where n is required to be 1 or more.
S22: acquiring the insertion position of each ink dot insertion;
after the value of n is determined, n dots are uniformly inserted between two adjacent dots, and the specific step S22 further includes:
s221: acquiring the distance between two ink dots in the axial direction of the image;
the distance between the two dots can be known from the image accuracy, i.e., 1/P2, denoted as D1, in inches.
S222: acquiring the insertion position of each inserted ink dot according to the distance;
preferably, the n dots inserted are evenly distributed between two dots of the image, and therefore, the distance between two of the n dots inserted is D1/(n + 1), denoted as D2;
for example, if the position of the first dot of the image is K1, the position of the first dot inserted between the first dot and the second dot of the image is K1+ D2, which is denoted as K11; the position of the inserted second ink dot is K1+2 multiplied by D2, which is marked as K12; by analogy, the position of the inserted nth dot is K1+ n × D2, which is denoted as K1n.
S223: inserting n dots between all adjacent two dots in the axial direction of the printed image according to the insertion position and the number n of the inserted dots;
specifically, step S223 further includes:
s2231: controlling the cylindrical printing medium to rotate for a first circle, and printing the image;
and starting printing, controlling the cylindrical printing medium to rotate, and printing an image on the cylindrical surface by the spray head in the first rotation.
S2232: inserting the ink dots in the printed image once according to the inserting position every time the cylindrical printing medium completes one rotation until the insertion of the nth ink dot is completed.
Because the distances among all ink dots of the image are equal, the spray head trolley only needs to be correspondingly moved by a distance D2 every time the ink dots are inserted.
Specifically, after the image printing is finished, before the cylindrical printing medium starts to rotate for the second circle, the distance D2 for the nozzle to move is controlled, the ink is discharged to print the image, and the insertion of the ink dots for the first time is finished;
after the first ink dot insertion is finished and before the cylindrical printing medium starts to rotate for the third circle, the spray head is controlled to move for a distance of D2 in the same direction, an ink is discharged to print an image, and the second ink dot insertion is finished;
and so on until the insertion of the nth dot is completed.
As shown in fig. 3, white dots represent dots of the image, and black dots represent interposed dots, where n =1, D2=1/2 × p2, and the position of the interposed dots is K1+ (1/2 × p 2). After the image is printed, the nozzle trolley moves leftwards or rightwards along the L1 direction by a distance D2 (leftwards in figure 3), and the position of the ink dot falling point corresponds to the insertion position.
And S2, by adopting a printing mode of inserting ink dots, the original nozzle with lower printing precision can also print an image with higher precision, so that the printing effect of the image is effectively improved.
S3: and when the printing precision is larger than or equal to the image precision, controlling the nozzles to print the image in groups according to a preset nozzle ink outlet mode.
When the printing precision of the spray head is higher, the cylindrical printing medium can complete image printing after rotating for one circle. Since the distance between dots ejected from the heads is very small, if the cylindrical printing medium is rotated at a high speed, the spread of dots ejected onto the cylindrical surface becomes large, and the mutual influence between dots becomes large, resulting in poor printing. And S3, ink is discharged at intervals by controlling the nozzles in the spray head, the ink is printed for multiple times, and the ink dots are solidified after being printed every time, so that the printing effect can be improved because the distance between the ink dots printed every time is larger than the original distance, the mutual influence among the ink dots is smaller.
Before printing, it is necessary to divide nozzles in the head into m nozzle groups in the height direction (the same direction as L1), where m is a natural number greater than 1, and m-1 nozzles are spaced between two adjacent nozzles in the nozzle groups, as shown in fig. 4, according to the printing accuracy of the head and the image accuracy in the cylindrical axis direction.
When the printing accuracy P1 is equal to the image accuracy P2 in the cylinder axis direction, m may be a natural number equal to or greater than 2 in order to increase the pitch between dots. In order to ensure a balance between printing efficiency and printing quality, it is preferable that m be 2.
The specific printing process is as follows:
s301: controlling only the first nozzle group to discharge ink to print an image when the cylindrical printing medium rotates for the first circle;
s302: after printing, performing ink point solidification on the image which is printed on the cylindrical surface by the ink discharged from the first nozzle group;
s303: controlling only the second nozzle group to discharge ink to print an image when the cylindrical printing medium rotates for the second circle;
s304: after printing, performing ink point solidification on the image which is printed on the cylindrical surface by the ink discharged from the second nozzle group;
s305: and the same is repeated until all the m nozzle groups print images in an ink mode, and then ink dot solidification is carried out on the images printed by the m-th nozzle group.
For example, as shown in fig. 4a, the nozzles in the head are divided into two nozzle groups, and when the cylindrical printing medium rotates for a first circle, only the nozzles in the first group print an image by discharging ink, as shown in fig. 4b (black dots represent nozzles that discharge ink, and white dots represent nozzles that do not discharge ink), and the ink dots are solidified after printing; during the second revolution, only the second set of nozzle sets will be inked to print the image, as shown in fig. 4c (black dots indicate nozzles that are inked, white dots indicate nozzles that are not inked), and the dots are cured after printing is completed.
Although the image precision after the nozzles are printed in groups is not changed, the distance between the printed ink dots is larger, and the ink dots are solidified firstly after being printed, so that the mutual influence among the ink dots is smaller, and the printing effect can be effectively improved.
When the printing accuracy P1 is greater than the image accuracy P2 in the cylindrical axis direction, when both are divisible, m = P1/P2; when both cannot be divided, m is an integer value of P1/P2. Grouping the ink-out printing and curing the printed images, please refer to steps S301 to S305, which will not be described herein.
In another embodiment, selecting any one of the m nozzle groups to discharge an ink print image. Further, any one nozzle group of the ink-out printing image is subjected to grouped ink-out printing and curing. For the detailed process, please refer to steps S301 to S305, which are not described herein again.
In one embodiment, when the nozzles are controlled to print an image in groups according to a preset nozzle ink discharging mode, after the a-th nozzle group discharges ink to print the image, a is a natural number which is greater than or equal to 1 and less than m, and if an abnormal nozzle is detected in the a-th nozzle group, a blank printing position corresponding to the abnormal nozzle occurs.
The abnormal nozzles are dredged and the like, so that the abnormal nozzles in the a-th nozzle group are recovered to be normal, and when the a + 1-th nozzle group is subjected to ink discharging printing, the recovered nozzles in the a-th nozzle group are also subjected to ink discharging printing at the same time, so that the position where a blank appears during the previous circle of cylindrical surface printing is filled, and the image printing effect is prevented from being reduced after the abnormal nozzles appear.
In another embodiment, when an abnormal nozzle such as a clogged nozzle occurs in the head when inserting a dot into the image, a blank area corresponding to the abnormal nozzle may be generated during printing. And (4) dredging the abnormal nozzle, and the like, so that after the abnormal nozzle is recovered to be normal, when the ink dot is inserted next time, the ink discharging amount of the nozzle recovered to be normal is increased, and the ink dot compensation is performed on the position where ink is not discharged when the ink dot is inserted last time.
In another embodiment, the image accuracy of the image to be printed in the circumferential direction of the cylinder is related to the firing frequency of the nozzle, the linear speed of rotation of the cylinder. If the linear velocity is unchanged, the higher the firing frequency of the nozzle is, the more ink dots are ejected by the nozzle per inch of length in the circumferential direction, and the higher the printing accuracy of the circumferential image is; if the ignition frequency is not changed, when the linear velocity of the cylindrical surface is smaller, ink dots per inch of length in the circumferential direction fall more, and the accuracy of a printed circumferential image is higher; and linear velocity is the product of cylindrical radius and angular velocity. In order to ensure the image accuracy of the image to be printed in the circumferential direction, the firing frequency may be determined according to the image accuracy in the circumferential direction, the cylindrical radius, and the angular velocity.
Specifically, let the cylindrical radius be R, the image accuracy in the circumferential direction of the image to be printed be P3, the angular velocity be ω, the linear velocity be v, and the firing frequency be F.
The image accuracy P3, the linear velocity v, and the firing frequency F are calculated as follows:
P3＝F/v；
wherein linear velocity v = ω × R;
p3= F/(ω × R), or F = ω × R × P3.
In another embodiment, the correspondence of the image accuracy, the cylindrical radius and the firing frequency is measured by repeated experiments, and the resulting experimental data is recorded in a table. And determining the corresponding relation among the image precision, the radius and the ignition frequency by a table look-up method during printing, and determining the ignition frequency.
In another embodiment, the corresponding relation among the image precision, the cylindrical radius and the ignition frequency is obtained in a software simulation mode, and a relation curve among the image precision, the cylindrical radius and the ignition frequency is generated. And determining the ignition frequency through the relation curve when printing.
In another embodiment, when the firing frequency does not satisfy the printing of the image accuracy in the circumferential direction, the cylindrical surface prints the image and then the image accuracy in the circumferential direction is ensured by inserting at least one dot between every two adjacent dots in the circumferential direction of the printed image. The method specifically comprises the following steps:
s11: acquiring circumferential printing precision when an image is printed by using the ignition frequency according to the ignition frequency of a spray head;
the firing frequency of the nozzle may be determined by a host computer or a control system, and the printing precision of the circumferential direction of the nozzle may be obtained according to the formula P = F/(ω × R), where P is the printing precision of the circumferential direction, ω is the angular velocity of the rotation of the cylindrical printing medium, R is the radius of the cylindrical printing medium, and F is the firing frequency of the nozzle.
S12: when the printing precision of the circumferential direction is less than the image precision of the circumferential direction, at least one ink dot is inserted between all adjacent two ink dots in the circumferential direction of the printed image after the image is printed on the cylindrical surface.
Specifically, step S12 further includes:
s121: determining the number of ink dots inserted between two adjacent ink dots in the circumferential direction of the image according to the printing precision in the circumferential direction and the image precision in the circumferential direction, and recording the number as m, wherein m is an integer greater than or equal to 1;
before inserting the ink dots, the number of the ink dots to be inserted needs to be acquired. Let P3 be the image precision in the circumferential direction, since P3 is greater than P, dividing P by P3,
when the integer division is possible, the value of m is P3/P-1;
when the division is not possible, the value of n is an integer value obtained by taking P3/P downward, where m is required to be a value of 1 or more.
S122: acquiring the insertion position of each time when the ink dot is inserted;
after the value of m is determined, the specific step S122 includes:
s1221: acquiring a distance between two ink dots in the circumferential direction of the image;
the distance between the two dots can be known from the circumferential printing precision, namely 1/P, which is marked as Q1 and has the unit of inch.
S1222: acquiring the distance between the inserted ink dots according to the distance;
preferably, the inserted m dots are evenly distributed between two dots of the image, and therefore, the distance between every two inserted m dots is Q1/(m + 1), which is denoted as Q2;
s1223: and acquiring the insertion time according to the distance.
The dots are inserted in the circumferential direction, and after the cylindrical printing medium completes one rotation, the printing start time of the second rotation needs to be delayed by Q2/v. Where v is the linear velocity of the cylindrical print medium.
By analogy, when the ink dot is inserted for the x-th time (x is more than or equal to 1 and less than or equal to m), the printing starting time is delayed by x (Q2/v).
S1224: inserting m dots between all adjacent two dots in the circumferential direction of the printed image according to the insertion time and the number m of inserted dots;
specifically, step S1224 further includes:
s12241: controlling the cylindrical printing medium to rotate for a first circle, and printing the image;
and starting printing, controlling the cylindrical printing medium to rotate, and printing an image on the cylindrical surface by the spray head in the first rotation.
S12242: after the cylindrical printing medium completes one rotation, and the printing time delay Q2/v, the printing of the image of the second round is started.
S12243: by analogy, every time the cylindrical printing medium completes one rotation, the printing time is delayed by Q2/v relative to the printing time of the previous rotation until the m-th printing is completed.
In the present embodiment, when the firing frequency of the head does not satisfy the image accuracy requirement in the circumferential direction, the image accuracy in the circumferential direction is improved by the method of inserting dots in the circumferential direction of the cylindrical surface print image.
In summary, in the embodiment of the present invention, in the cylindrical surface printing, the method of inserting ink dots or controlling nozzles to print in groups is adopted according to the printing precision of the nozzle and the image precision of the printed image in the cylindrical axial direction, so as to solve the problem of poor printing effect caused by insufficient printing precision of the nozzle, high rotation speed of the cylindrical printing medium, and the like in the cylindrical surface printing, and improve the printing quality.
Example two
Referring to fig. 5, an embodiment of the present invention provides a cylindrical surface printing control apparatus 10, where the apparatus 10 includes:
the acquisition module 11 is used for acquiring the printing precision of the spray head and the image precision of an image to be printed in the cylindrical axial direction;
a dot inserting module 12 for inserting at least one dot between all adjacent two dots in an axial direction of the printed image after printing the image on the cylindrical surface when the printing accuracy is less than the image accuracy;
and the nozzle grouping printing module 13 is used for grouping the nozzles to print the images according to a preset nozzle ink discharging mode when the printing precision is greater than or equal to the image precision in the axial direction.
Further, the dot insertion module 12 further includes:
an insertion number acquiring unit 121 configured to determine, according to the printing accuracy and the image accuracy, the number of dots to be inserted between two adjacent dots in the image axial direction, where n is an integer greater than or equal to 1;
an insertion position acquisition unit 122 for acquiring an insertion position at each time of inserting an ink dot;
a dot insertion unit 123 configured to insert n dots between all of two adjacent dots in the printed image in the axial direction according to the insertion position;
further, the insertion position obtaining unit 122 further includes:
a distance acquisition unit configured to acquire a distance between two ink dots in an axial direction of the image;
and an insertion position determining unit for determining the insertion position of each insertion of the ink dots according to the distance and the number n of the inserted ink dots.
Further, the dot inserting unit 123 further includes:
a first-cycle image printing unit for printing the image when the cylindrical printing medium rotates for a first cycle;
and the ink dot insertion execution unit is used for inserting ink dots into the printed image once according to the insertion position every time the cylindrical printing medium completes one rotation until the insertion of the nth ink dot is completed.
Further, the nozzle-grouping printing module 13 further includes:
a nozzle grouping unit: the nozzle group is used for dividing all nozzles in the nozzle into m nozzle groups according to the height direction of the nozzle, wherein m is a natural number greater than 1, and m-1 nozzles are arranged between every two adjacent nozzles in each nozzle group at intervals;
the first nozzle group printing unit is used for controlling the first nozzle group to discharge ink to print the image when the cylindrical printing medium rotates for a first circle;
a first curing unit for curing an image printed onto the cylindrical surface by the first nozzle group;
the second nozzle group printing is used for controlling the second nozzle group to discharge ink to print the image when the cylindrical printing medium rotates for the second circle;
a second curing unit for curing the image printed on the cylindrical surface by the ink discharged from the second nozzle group;
and the nozzle group printing and curing unit is used for sequentially performing ink discharging printing and curing on all the m nozzle groups.
Further, the apparatus 10 further comprises:
and the abnormal nozzle printing compensation unit is used for controlling recovered nozzles in the a-th nozzle group to simultaneously perform ink discharging printing when the recovered nozzles in the a + 1-th nozzle group are controlled to perform ink discharging printing after the a is a natural number which is more than or equal to 1 and less than m after the image is printed by ink discharging of the a-th nozzle group.
Further, the apparatus 10 further comprises:
and an ignition frequency determining unit for determining the ignition frequency of the nozzle head according to the image accuracy of the image to be printed in the circumferential direction of the cylinder, the radius of the cylinder, and the angular speed of rotation of the cylinder.
Further, the apparatus 10 further comprises:
a circumferential printing precision acquisition unit which acquires circumferential printing precision printed by using the ignition frequency according to the ignition frequency of the nozzle;
a circumferential dot insertion unit that inserts at least one dot between all adjacent two dots in a circumferential direction of the image after printing the image on the cylindrical surface when the circumferential printing accuracy is less than the image accuracy in the circumferential direction.
In the cylindrical surface printing control apparatus provided in the second embodiment, in the cylindrical surface printing, according to the printing accuracy of the nozzle and the image accuracy of the printed image in the cylindrical axial direction, a method of inserting ink dots or controlling nozzles to print in groups is adopted, so that the problem of poor printing effect caused by insufficient printing accuracy of the nozzle, high rotation speed of the cylindrical printing medium and the like in the cylindrical surface printing is solved, and the printing quality is improved.
EXAMPLE III
The third embodiment of the present invention also discloses a printer, including: at least one processor 301, at least one memory 302, and computer program instructions stored in the memory area 302 as shown, which when executed by the processor 301, implement the method of the present embodiment.
In particular, the processor 301 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
Memory 302 may be used for mass storage of data or instructions. By way of example, and not limitation, memory 302 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, magnetic tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. The memory 302 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 302 is non-volatile solid-state memory. In certain embodiments, memory 302 comprises Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable PROM (EEPROM), electrically Alterable ROM (EAROM), or flash memory, or a combination of two or more of these.
The processor 301 realizes the showerhead heating method in the above-described embodiment by reading and executing computer program instructions stored in the memory 302.
In one example, the printer may further include a communication interface 303 and a bus 310, wherein, as shown in fig. 6, the processor 301, the memory 302, the communication interface 303 are connected via the bus 310 and communicate with each other.
The communication interface 303 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiment of the present invention.
Bus 310 includes hardware, software, or both to couple the components comprising the print data processing apparatus to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 310 may include one or more buses, where appropriate. Although specific buses have been described and illustrated with respect to embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
In the printer provided by the third embodiment, in the cylindrical surface printing, according to the printing precision of the nozzle and the image precision of the printed image in the cylindrical axial direction, the method of inserting ink dots or controlling the nozzles to print in groups is adopted, so that the problem of poor printing effect caused by insufficient printing precision of the nozzle, high rotating speed of the cylindrical printing medium and the like in the cylindrical surface printing is solved, and the printing quality is improved.
Example four
In addition, in combination with the method for controlling printing on a cylindrical surface in the above embodiments, a fourth embodiment of the present invention may be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the cylindrical surface printing control methods in the above embodiments.
In summary, according to the method, the apparatus, the control panel, the printer, and the medium for controlling printing on a cylindrical surface provided by the embodiments of the present invention, in printing on a cylindrical surface, a method of inserting ink dots or controlling nozzles to print in groups is adopted according to the printing precision of the nozzles and the image precision of a printed image in the axial direction of the cylinder, so that the problem of poor printing effect caused by insufficient printing precision of the nozzles, high rotation speed of the cylindrical printing medium, and the like in printing on a cylindrical surface is solved, and the printing quality is improved.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (9)

1. A cylindrical surface printing control method, the method comprising:
acquiring the printing precision of a spray head and the axial image precision of an image to be printed, wherein the axial image precision of the image to be printed refers to the number of ink dots required to be printed per inch in the axial direction of a cylinder when the image to be printed is printed on the surface of the cylinder;
inserting at least one dot between all adjacent two dots in the axial direction of the printed image after printing the image on the cylindrical surface when the printing accuracy is less than the image accuracy in the axial direction, including: when the printing precision is smaller than the image precision in the axial direction, determining the number of inserted ink dots between two adjacent ink dots in the axial direction of the printed image according to the printing precision and the image precision in the axial direction, and recording the number as n, wherein n is an integer greater than or equal to 1; acquiring the insertion position of each ink dot insertion; inserting n dots between all adjacent two dots in an axial direction of the image according to the insertion position, including: printing the image while the cylindrical printing medium rotates for a first revolution; inserting ink dots into the printed image once according to the inserting position every time the cylindrical printing medium completes one rotation until the insertion of the nth ink dot is completed;
and when the printing precision is larger than or equal to the image precision in the axial direction, controlling the nozzles to print the images in groups according to a preset ink discharging mode.
2. A cylindrical surface printing control method according to claim 1, wherein said obtaining an insertion position at each dot insertion includes:
acquiring the distance between two ink dots in the axial direction of the image;
and acquiring the insertion position of each inserted ink dot according to the distance and the number n of the inserted ink dots.
3. A cylindrical surface printing control method according to claim 1, wherein all nozzles in the head are divided into m nozzle groups in the height direction of the head, m being a natural number greater than 1, and adjacent two nozzles in each nozzle group are spaced by m-1 nozzles; when the printing precision is greater than or equal to the image precision in the axial direction, the image is printed by grouping the nozzles according to a preset ink outlet mode, and the method comprises the following steps:
controlling the first nozzle group to discharge ink to print the image when the cylindrical printing medium rotates for a first circle;
controlling a UV lamp to discharge ink from the first nozzle group and print the ink to obtain an image of the cylindrical surface for curing;
controlling the second nozzle group to discharge ink to print the image when the cylindrical printing medium rotates for the second circle;
controlling the UV lamp to discharge ink from the second nozzle group and print the ink to obtain an image of the cylindrical surface for curing;
and the rest is repeated until all the m nozzle groups are subjected to ink discharging printing and curing.
4. A cylindrical surface printing control method according to claim 3, further comprising:
when the a-th nozzle group discharges ink to print the image, a is a natural number which is more than or equal to 1 and less than m, if abnormal nozzles appear in the a-th nozzle group, after recovery processing is carried out on the abnormal nozzles, the recovered nozzles in the a-th nozzle group are controlled to discharge ink to print when the a + 1-th nozzle group is controlled.
5. The cylindrical surface printing control method according to any one of claims 1 to 4, further comprising:
the firing frequency of the head is determined according to the image accuracy of the image to be printed in the circumferential direction of the cylinder, the radius of the cylinder, and the angular velocity of the rotation of the cylinder.
6. The cylindrical surface printing control method according to any one of claims 1 to 4, further comprising:
acquiring circumferential printing precision when an image is printed by using the ignition frequency according to the ignition frequency of a spray head;
when the printing precision of the circumferential direction is less than the image precision of the circumferential direction, after the image is printed on the cylindrical surface, at least one ink dot is inserted between all adjacent two ink dots in the circumferential direction of the printed image.
7. A cylindrical surface printing control apparatus, characterized in that the apparatus comprises:
the acquisition module is used for acquiring the printing precision of the spray head and the image precision of an image to be printed in the axial direction of the cylinder;
an ink dot insertion module for inserting at least one ink dot between all adjacent two ink dots in an axial direction of a printed image after printing the image on the cylindrical surface when the printing accuracy is less than the image accuracy in the axial direction, wherein inserting at least one ink dot between all adjacent two ink dots in the axial direction of the printed image after printing the image on the cylindrical surface when the printing accuracy is less than the image accuracy in the axial direction comprises: when the printing precision is smaller than the image precision in the axial direction, determining the number of inserted ink dots between two adjacent ink dots in the axial direction of the printed image according to the printing precision and the image precision in the axial direction, and recording the number as n, wherein n is an integer greater than or equal to 1; acquiring the insertion position of each ink dot insertion; inserting n dots between all adjacent two dots in an axial direction of the image according to the insertion position, including: printing the image when the cylindrical printing medium rotates for a first circle; inserting ink dots into the printed image once according to the inserting position every time the cylindrical printing medium completes one rotation until the insertion of the nth ink dot is completed;
and the nozzle grouping printing module is used for controlling the nozzles to print the image in groups according to a preset nozzle ink outlet mode when the printing precision is greater than or equal to the axial graph precision.
8. A printer, characterized in that the printer comprises: at least one processor, at least one memory, and computer program instructions stored in the memory that, when executed by the processor, implement the method of any of claims 1-6.
9. A storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of any one of claims 1-6.
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