CN114103509A - Digital jet printing method and conduction band type printing system - Google Patents

Digital jet printing method and conduction band type printing system Download PDF

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Publication number
CN114103509A
CN114103509A CN202111497721.4A CN202111497721A CN114103509A CN 114103509 A CN114103509 A CN 114103509A CN 202111497721 A CN202111497721 A CN 202111497721A CN 114103509 A CN114103509 A CN 114103509A
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China
Prior art keywords
printed
jet printing
camera
stepping
conveying
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CN202111497721.4A
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CN114103509B (en
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江华
郭晓林
彭卫清
张龙
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Shenzhen Hanhong Software Technology Co ltd
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Shenzhen Hanhong Software Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

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Abstract

The embodiment of the invention relates to the field of printing machines, and discloses a digital jet printing method and a conduction band type printing system, wherein the system comprises a jet printing device, a conveying device and a camera, a plurality of spray heads are arranged on the jet printing device, each spray head comprises a working section nozzle group and a compensation section nozzle group which are adjacently arranged, the method comprises the steps of firstly moving an object to be printed to a preset jet printing area through the conveying device, jet printing patterns and mark points on the object to be printed, secondly conveying the object to be printed according to a preset advancing amount, then shooting the mark points which are actually jet printed through the camera, determining a stepping deviation value according to the positions of the mark points shot by the camera, then adjusting image data which are required to be jet printed by the jet printing device according to the stepping deviation value, adjusting switches of nozzles on the compensation section nozzle groups and the working section nozzle groups, and finally controlling the adjusted nozzles to perform jet printing operation on the object to be printed according to the adjusted image data, thereby realizing accurate jet printing of image data.

Description

Digital jet printing method and conduction band type printing system
Technical Field
The embodiment of the invention relates to the field of printing machines, in particular to a digital jet printing method and a conduction band type printing system.
Background
In the prior art, a conduction band type scanning printer generally drives an object to be printed to step at a preset speed through a transmission system, then controls an ink jet unit to jet ink on the object to be printed, and finally forms a pattern to finish printing. The transmission system generally includes a roller with a stepping motor connected to a rotating shaft of the stepping motor and a conveyor belt for placing an object to be printed, and the roller drives the conveyor belt to move.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: because there are machining error, assembly error and other reasons in cylinder and the conveyer belt in the cylinder, lead to waiting to print the thing and often can have transmission error in the removal process at every turn, can not ensure to wait that the thing of printing accurately moves to preset position, the inkjet unit carries out the inkjet according to preset position this moment, has the inaccurate condition of step-by-step overprinting precision, will lead to spun pattern to have the coincidence or leave white, influences printing quality.
Disclosure of Invention
The embodiment of the application provides a digital jet printing method and a conduction band type printing system, which can solve the problem that the pattern jet printing position is inaccurate in the digital printing process.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a digital inkjet printing method, which is applied to a conduction band printing system, where the system includes an inkjet printing device, a conveying device, and a camera, where the inkjet printing device is provided with a plurality of nozzles, each of the nozzles includes a working section nozzle set and a compensation section nozzle set that are adjacently arranged, and the number of nozzles in the compensation section nozzle set is less than that of the working section nozzle set, the method includes: moving the object to be printed to a preset jet printing area through the conveying device, and jet printing patterns and mark points on the object to be printed; conveying the object to be printed according to a preset advancing amount; shooting the mark points actually sprayed and printed through the camera, and determining a stepping deviation value according to the positions of the mark points shot by the camera; adjusting image data required to be subjected to spray printing by the spray printing device according to the stepping deviation value, and adjusting switches of nozzles on the compensation section nozzle group and the working section nozzle group; and controlling the adjusted nozzle to perform jet printing operation on the object to be printed according to the adjusted image data.
In some embodiments, before the moving the object to be printed to the preset jet printing area by the conveying device and jetting and printing the pattern and the mark point on the object to be printed, the method further comprises: acquiring a theoretical stepping pixel error of the conveying device; and adjusting the control parameters of a stepping motor in the conveying device according to the maximum value of the theoretical stepping pixel error.
In some embodiments, the number of nozzles on the compensation segment nozzle group is at least twice the maximum value of the theoretical stepping pixel error of the transport device.
In some embodiments, before the conveying the object to be printed according to the preset advance amount, the method further includes: setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error; the conveying of the object to be printed according to the preset advancing amount comprises the following steps: and according to the preset advancing amount, the object to be printed is transmitted in a stepping mode, so that the mark point can be shot by the camera, and the current jet printing image and the next jet printing image of the object to be printed are overlapped theoretically.
In some embodiments, before the conveying the object to be printed according to the preset advance amount, the method further includes: setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error; the conveying of the object to be printed according to the preset advancing amount comprises the following steps: and step-by-step transmitting the object to be printed according to the preset advancing amount so that the mark point can be shot by the camera, and a margin exists between the current jet printing image and the next jet printing image of the object to be printed theoretically.
In some embodiments, the shooting the mark points actually printed by the inkjet through the camera, and determining a step deviation value according to the positions of the mark points shot by the camera includes: judging whether the mark point is in a shooting center of the camera or not; if yes, the stepping deviation value is zero; and if not, determining the stepping deviation value according to the position relation between the mark point and the shooting center of the camera.
In some embodiments, the adjusting the image data to be printed by the printing device and the adjusting the switches of the nozzles in the compensation segment nozzle group and the working segment nozzle group according to the step deviation value includes: determining the number of pixels of the mark point offset as a first number according to the stepping deviation value; and closing a first number of nozzles on one side, far away from the compensation section nozzle group, in the working section nozzle group, and opening a first number of nozzles, close to the working section nozzle group, in the compensation section nozzle group.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a conduction band printing system, including a controller, where the controller includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first aspect as described above.
In some embodiments, the system further comprises: the camera is connected with the controller and used for acquiring image data of an object to be printed; the conveying device is connected with the controller and is used for carrying and conveying the object to be printed; and the spray printing device is connected with the controller, and the camera is arranged on one side of the conveying direction of the conveying device.
In some embodiments, the conveying device is provided with a stepping motor and a conveying belt, the conveying belt is used for carrying and conveying the object to be printed, the stepping motor is used for controlling the conveying belt to perform stepping conveying work, and the number of the nozzles on the compensation section nozzle group is at least twice of the maximum value of the theoretical stepping pixel error of the conveying device.
In order to solve the above technical problem, in a third aspect, the present invention further provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method according to the first aspect or the second aspect.
To solve the above technical problem, in a fourth aspect, the present invention further provides a computer program product, which includes a computer program stored on a computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, cause the computer to execute the method according to the first aspect or the second aspect.
Compared with the prior art, the invention has the beneficial effects that: different from the prior art, the embodiment of the invention provides a digital jet printing method and a guide belt type printing system, the system comprises a jet printing device, a conveying device and a camera, wherein a plurality of nozzles are arranged on the jet printing device, each nozzle comprises a working section nozzle group and a compensation section nozzle group which are arranged adjacently, and the camera is arranged on one side of the jet printing device along the conveying direction of the conveying device, the method comprises the steps of firstly moving an object to be printed to a preset jet printing area through the conveying device, jet printing patterns and mark points on the object to be printed, secondly conveying the object to be printed according to a preset advance amount, then shooting the mark points which are actually jet printed through the camera, determining a step deviation value according to the positions of the mark points shot by the camera, and then adjusting image data which are required to be jet printed by the jet printing device according to the step deviation value, and adjusting the switches of the nozzles on the compensation section nozzle group and the working section nozzle group, and finally controlling the adjusted nozzles to perform jet printing operation on the object to be printed according to the adjusted image data, thereby realizing accurate jet printing of the image data.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic diagram of an application environment of a digital jet printing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of two specific configurations of nozzles of a nozzle of the inkjet printing apparatus of the conduction band printing system shown in FIG. 1;
fig. 3 is a schematic flow chart of a digital inkjet printing method according to a first embodiment and a second embodiment of the present invention;
fig. 4 is a working example of the digital jet printing method provided in the first and second embodiments of the present invention;
fig. 5 is a schematic view of a sub-flow of step S100 in the method shown in fig. 3 according to the first embodiment and the second embodiment;
fig. 6 is a schematic view of a sub-flow of step S200 in the method shown in fig. 3 according to the first embodiment and the second embodiment;
FIG. 7 is a schematic sub-flowchart of step S200 of the method shown in FIG. 3 according to one embodiment;
FIG. 8 is a schematic sub-flowchart of step S200 of the method shown in FIG. 3 according to the second embodiment;
fig. 9 is a schematic hardware structure diagram of a conduction band printing system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "horizontal", "left", "right" and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problems that the printing precision is not high and the phenomenon of superposition or blank leaving easily exists in the patterns sprayed and printed on the object to be printed when the existing conduction band type printing system executes the spraying and printing work, the embodiment of the invention provides a digital spraying and printing method and a conduction band type printing system.
Fig. 1 is a schematic diagram of an application environment of a digital inkjet printing method according to an embodiment of the present invention, where the application environment is a conduction band printing system, and the system includes: the printing device comprises a driving mechanism 1, a printing trolley 2, a spray head 3, a camera 4, an object to be printed 5 and a conveyor belt 6. Wherein,
the driving mechanism 1 and the conveyor belt 6 constitute a conveying device, and the arrow in fig. 1 indicates the feeding conveying direction. The driving mechanism 1 at least comprises a stepping motor and a roller, the stepping motor provides power for the conveying device and can be used for controlling the travel amount of the conveying device, the roller is also the part indicated by the arrow of the driving mechanism 1 in fig. 1, when the conveying device works, the stepping motor drives the roller, and the roller drives the conveying belt 6 to move according to the preset travel amount so as to realize the conveying of the object to be printed 5 placed on the conveying belt 6.
The printing trolley 2 is a jet printing device, the jet printing device is provided with a plurality of nozzles 3, each nozzle 3 is provided with a plurality of nozzles linearly arranged along the conveying direction, for example, five hundred nozzles can be arranged, the specific structure of the nozzle on the nozzle 3 refers to fig. 2, which shows the specific structure of the nozzle 3 on the printing trolley 2 in the conduction band printing system shown in fig. 1, wherein the longer nozzle on the left side in the nozzle a is a working section nozzle group 31, the shorter nozzle on the right side is a compensation section nozzle group 32, and the nozzle B sets the working section nozzle group 31 on the right side, and the compensation section nozzle group 32 is arranged on the left side. The spray head A is applied to a scene with a white space phenomenon between the images sprayed and printed in the two times, and the spray head B is applied to a scene with a superposition phenomenon between the images sprayed and printed in the two times.
The camera 4 is used for acquiring an image of the object 5 to be printed placed on the conveyor belt 6 and confirming a stepping deviation value according to the position of a mark point in the image.
The object to be printed 5 is used for carrying ink sprayed on the printing trolley 2, and can be a shell of a certain product, an artwork, a textile, a paper product and the like, the material of the object can be paper, cloth, plastic and the like, and the object can be selected and designed according to actual needs.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
The embodiment of the invention provides a digital jet printing method, which is applied to a conduction band type printing system, wherein the conduction band type printing system can be a system as shown in the application scene and figure 1, the conduction band type printing system at least comprises a jet printing device, a conveying device and a camera, a plurality of spray heads are arranged on the jet printing device, each spray head comprises a working section nozzle group and a compensation section nozzle group which are arranged adjacently, and the phenomenon of superposition between images which are jet printed twice before and after is taken as an example, at the moment, the spray heads are arranged as shown in a spray head B of the application scene, namely, the number of the nozzles of the compensation section nozzle group is less than that of the working section nozzle group, the camera is arranged on one side of the working section nozzle group along the conveying direction of the conveying device, and the compensation section nozzle group is arranged on one side of the working section nozzle group far away from the camera, referring to fig. 3, a flow of a digital inkjet printing method provided by an embodiment of the present invention is shown, where the digital inkjet printing method includes, but is not limited to, the following steps:
step S100: moving the object to be printed to a preset jet printing area through the conveying device, and jet printing patterns and mark points on the object to be printed;
in the embodiment of the present invention, please refer to fig. 4 together, which illustrates a working example of the digital jet printing method provided by the embodiment of the present invention, first, as shown in the case of (a) in fig. 4, after the object to be printed 5 is moved to the preset jet printing area by the conveying device 6, the mark point is jet printed at the edge of the object to be printed 5 by the printing trolley 2, and simultaneously, the pattern is jet printed at the proper position of the object to be printed 5, wherein the mark point is denoted by the symbol "●" in fig. 4.
Further, in the embodiment of the present invention, before the mark point is printed, it is further required to confirm where the preset print area to which the to-be-printed object 5 needs to be transferred from the beginning by the transfer device is located, so in some embodiments, please refer to fig. 5, which shows a sub-flow of step S100 in the digital print method shown in fig. 3, before the to-be-printed object is moved to the preset print area by the transfer device and the mark point is printed on the to-be-printed object, the method further includes:
step S110: acquiring a theoretical stepping pixel error of the conveying device;
step S120: and adjusting the control parameters of a stepping motor in the conveying device according to the maximum value of the theoretical stepping pixel error.
In the embodiment of the present invention, it is necessary to obtain the theoretical step pixel error of the conveying device, and determine the maximum value of the theoretical step pixel error within the range of the theoretical step pixel error, so as to correct the control parameter of the stepping motor according to the maximum value, so that the stepping motor can drive the conveying belt to convey the conveying belt to the preset jet printing area. And preferably, the number of nozzles in the compensation segment nozzle group is at least twice the maximum value of the theoretical stepping pixel error of the conveying device.
Step S200: conveying the object to be printed according to a preset advancing amount;
in the embodiment of the present invention, referring to fig. 4, after the mark point is printed, the conveyor belt 6 is controlled to convey the object to be printed 5 according to a preset travel amount, so that the position of the object to be printed 5 on the conveyor belt 6 reaches the position shown in (b) in fig. 4, that is, the position where the mark point can be shot by the camera. Specifically, referring to fig. 6, it shows a sub-flow of step S200 in the method shown in fig. 3, the delivering the object to be printed according to the preset amount of travel includes:
step S210: setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error;
specifically, in the embodiment of the present invention, when the preset advance amount is set, the preset advance amount needs to be set by combining the size of the spray printing range of the printing trolley 2 and the maximum value of the step error of the conveying device, so that the position of the mark point subjected to spray printing enters the shooting range of the camera 4 after the conveying belt 6 moves, and after the preset advance amount is moved, the image subjected to next spray printing can coincide with the image subjected to current spray printing.
Step S220 a: and according to the preset advancing amount, the object to be printed is transmitted in a stepping mode, so that the mark point can be shot by the camera, and the current jet printing image and the next jet printing image of the object to be printed are overlapped theoretically.
In the embodiment of the invention, after the preset advancing amount is determined, the stepping transmission operation of the object to be printed is executed according to the preset advancing amount, so that the object to be printed is transmitted in a stepping mode, after the transmission is finished, the camera can shoot the mark point, and theoretically, a current jet printing image on the object to be printed is overlapped with a next jet printing image.
Step S300: shooting the mark points actually sprayed and printed through the camera, and determining a stepping deviation value according to the positions of the mark points shot by the camera;
in the embodiment of the present invention, please refer to fig. 4 together, theoretically, after the object to be printed is conveyed according to the preset advance amount, the mark point M should be located at a position right below the center of the camera, and a deviation value will occur with the center of the camera when an error occurs as shown in fig. 4. Therefore, whether there is a step deviation and a step deviation value can be determined by the relative position of the mark point shot by the camera on the camera, specifically, referring to fig. 7, which shows a sub-flow of step S300 in the method shown in fig. 3, the shooting of the mark point actually sprayed by the camera and the determination of the step deviation value according to the position of the mark point shot by the camera includes:
step S310: judging whether the mark point is in a shooting center of the camera or not; if yes, go to step S320; if not, jumping to step S330;
step S320: the step deviation value is zero;
step S330: and determining the stepping deviation value according to the position relationship between the mark point and the shooting center of the camera.
In the embodiment of the present invention, please refer to fig. 4 together, after the object 5 to be printed is conveyed according to the preset travel amount, the position of the object 5 to be printed on the conveyor belt 6 reaches the position shown in the situation (b) in fig. 4, at this time, the camera 4 determines whether the mark point M is at the shooting center of the camera according to the position of the mark point M actually sprayed and printed in the imaging sensor of the camera, if so, there is no step error, if not, there is a step error, at this time, the step deviation value can be calculated according to the distance between the mark point M and the shooting center point of the camera 4, that is, the distance between the imaging position of the mark point M on the imaging sensor and the center position of the imaging sensor.
Step S400: adjusting image data required to be subjected to spray printing by the spray printing device according to the stepping deviation value, and adjusting switches of nozzles on the compensation section nozzle group and the working section nozzle group;
in the embodiment of the present invention, based on the step S110, when there is theoretically a phenomenon of overlapping between the current inkjet printing image and the next inkjet printing image, after the step deviation value is calculated, the number of pixels of the offset of the mark point is determined to be the first number according to the step deviation value; and closing the first number of nozzles on one side, far away from the compensation section nozzle group, in the working section nozzle group, and opening the first number of nozzles, close to the working section nozzle group, in the compensation section nozzle group, wherein the image data of each nozzle is correspondingly translated, so that the adjusted image data can be jet-printed at a correct position when the jet-printing device performs jet-printing next time.
Step S500: and controlling the adjusted nozzle to perform jet printing operation on the object to be printed according to the adjusted image data.
In the embodiment of the invention, after the nozzle on the jet printing device and the image data needing jet printing next time are adjusted, the adjusted nozzle is controlled to execute digital jet printing operation on the object to be printed according to the modified image data, so that the transmission error compensation is completed, the accurate jet printing is realized, and the printed image has better feathering effect. Further, after the inkjet printing device has performed one inkjet printing operation, the process may return to step S100 to perform calibration and inkjet printing for the next inkjet printing.
In the following, an example of a digital inkjet printing method applied to the conduction band printing system is provided in combination with the conduction band printing system described in the above application scenario, where the conduction band printing system includes two compensation modes, and an embodiment of the present invention takes a negative compensation mode (using the B nozzle shown in fig. 2) as an example, and takes a step pixel error of a stepping motor as 1-5 pixels as an example, and a negative deviation is obtained according to a printing effect caused by the step pixel error, at this time, a conveyor belt is moved forward less, and a coincidence phenomenon is formed if printing is performed according to a theoretical value. Specifically, in this example, the total number of nozzles of the inkjet printing device is 500, the number of the working segment nozzle groups 31 is 490, the width of the inkjet printing device per scanning printing is 490 pixels (theoretically, the stepping motor controls the distance of the object to be printed by stepping 490 pixels each time), the number of the compensation segment nozzle groups 32 is 10 (10 pixels), and the maximum value of the stepping pixel error is 5 pixels, that is, the maximum value of the stepping pixel error of the compensation segment nozzle groups 32 is twice as large as the maximum value of the stepping pixel error. Based on the maximum value of the pixel error of the stepping motor which steps less at each time according to the theoretical stepping length, only negative compensation can occur. Specifically, the following:
the stepping value of the stepping motor is changed according to the maximum value of the theoretical stepping pixel error, 5 pixels are stepped less each time (from 490 to 485), so that the result caused by the transmission error is superposition, and the nozzle group of the working section and the nozzle group of the compensation section can be controlled according to the number of pixels of the superposition area obtained by the camera. For example, if the number of pixels in the overlapped area is 4, four nozzles of the working segment nozzle group far from the compensation segment nozzle group are controlled to be closed, four nozzles of the compensation segment nozzle group near the working segment nozzle group are controlled to be opened to form a final working area, all image data to be printed correspondingly translate, the width of the printing device which scans and prints once is unchanged or 490 pixels, and transmission errors are overcome.
Example two
The embodiment of the invention provides a digital jet printing method, which is applied to a conduction band printing system, wherein the conduction band printing system can be a system as shown in the application scene and figure 1, the conduction band printing system at least comprises a jet printing device, a conveying device and a camera, the jet printing device is provided with a plurality of nozzles, the nozzles comprise a working section nozzle group and a compensation section nozzle group which are adjacently arranged, and the phenomenon of blank leaving exists between images which are jet printed for two times is taken as an example, at the moment, the nozzles are arranged as shown in the nozzle A of the application scene, namely, the number of the nozzles of the compensation section nozzle group is less than that of the working section nozzle group, the difference between the embodiment of the invention and the embodiment is that one side of the compensation section nozzle group along the conveying direction of the conveying device is provided with the camera, the compensation section nozzle group is provided with the working section nozzle group on a side away from the camera, please refer to fig. 3, which shows a flow of a digital jet printing method provided by an embodiment of the present invention, and the digital jet printing method includes, but is not limited to, the following steps:
step S100: moving the object to be printed to a preset jet printing area through the conveying device, and jet printing patterns and mark points on the object to be printed;
in the embodiment of the present invention, please refer to the above fig. 4 together, which illustrates a working example of the digital jet printing method provided by the embodiment of the present invention, first, as shown in the case of (a) in fig. 4, after the object to be printed 5 is moved to the preset jet printing area by the conveying device 6, the mark point is jet printed at the edge of the object to be printed 5 by the printing trolley 2, and simultaneously, the pattern is jet printed at the proper position of the object to be printed 5, wherein, the mark point is denoted by "●" in fig. 4.
Further, in the embodiment of the present invention, before the mark point is printed, it is further required to confirm where the preset print area to which the to-be-printed object 5 needs to be transferred from the beginning by the transfer device is located, so in some embodiments, please refer to fig. 5, which shows a sub-flow of step S100 in the digital print method shown in fig. 3, before the to-be-printed object is moved to the preset print area by the transfer device and the mark point is printed on the to-be-printed object, the method further includes:
step S110: acquiring a theoretical stepping pixel error of the conveying device;
step S120: and adjusting the control parameters of a stepping motor in the conveying device according to the maximum value of the theoretical stepping pixel error.
In the embodiment of the present invention, it is necessary to obtain the theoretical step pixel error of the conveying device, and determine the maximum value of the theoretical step pixel error within the range of the theoretical step pixel error, so as to correct the control parameter of the stepping motor according to the maximum value, so that the stepping motor can drive the conveying belt to convey the conveying belt to the preset jet printing area. And preferably, the number of nozzles in the compensation segment nozzle group is at least twice the maximum value of the theoretical stepping pixel error of the conveying device.
Step S200: conveying the object to be printed according to a preset advancing amount;
in the embodiment of the present invention, referring to fig. 4, after the mark point is printed, the conveyor belt 6 is controlled to convey the object to be printed 5 according to a preset travel amount, so that the position of the object to be printed 5 on the conveyor belt 6 reaches the position shown in (b) in fig. 4, that is, the position where the mark point can be shot by the camera. Specifically, referring to fig. 8, it shows a sub-flow of step S200 in the method shown in fig. 3, the delivering the object to be printed according to the preset amount of travel includes:
step S210: setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error;
specifically, in the embodiment of the present invention, when the preset advance amount is set, firstly, the preset advance amount needs to be set by combining the size of the jet printing range of the printing trolley 2 and the maximum value of the step error of the conveying device, so that the position of the mark point after jet printing enters the shooting range of the camera 4 after the conveyor belt 6 moves, and after the preset advance amount is moved, the image of the next jet printing can have a blank phenomenon with the image of the current jet printing.
Step S220 b: and step-by-step transmitting the object to be printed according to the preset advancing amount so that the mark point can be shot by the camera, and a margin exists between the current jet printing image and the next jet printing image of the object to be printed theoretically.
In the embodiment of the invention, after the preset advancing amount is determined, the stepping transmission operation of the object to be printed is executed according to the preset advancing amount, so that the object to be printed is transmitted in a stepping mode, after the transmission is finished, the camera can shoot the mark point, and theoretically, a margin exists between the current jet printing image and the next jet printing image on the object to be printed.
Step S300: shooting the mark points actually sprayed and printed through the camera, and determining a stepping deviation value according to the positions of the mark points shot by the camera;
in the embodiment of the present invention, please refer to fig. 4 together, theoretically, after the object to be printed is conveyed according to the preset advance amount, the mark point M should be located at a position right below the center of the camera, and a deviation value will occur with the center of the camera when an error occurs as shown in fig. 4. Therefore, whether there is a step deviation and a step deviation value can be determined by the relative position of the mark point shot by the camera on the camera, specifically, referring to fig. 7, which shows a sub-flow of step S300 in the method shown in fig. 3, the shooting of the mark point actually sprayed by the camera and the determination of the step deviation value according to the position of the mark point shot by the camera includes:
step S310: judging whether the mark point is in a shooting center of the camera or not; if yes, go to step S320; if not, jumping to step S330;
step S320: the step deviation value is zero;
step S330: and determining the stepping deviation value according to the position relationship between the mark point and the shooting center of the camera.
In the embodiment of the present invention, please refer to fig. 4 together, after the object 5 to be printed is conveyed according to the preset travel amount, the position of the object 5 to be printed on the conveyor belt 6 reaches the position shown in the situation (b) in fig. 4, at this time, the camera 4 determines whether the mark point M is at the shooting center of the camera according to the position of the mark point M actually sprayed and printed in the imaging sensor of the camera, if so, there is no step error, if not, there is a step error, at this time, the step deviation value can be calculated according to the distance between the mark point M and the shooting center point of the camera 4, that is, the distance between the imaging position of the mark point M on the imaging sensor and the center position of the imaging sensor.
Step S400: adjusting image data required to be subjected to spray printing by the spray printing device according to the stepping deviation value, and adjusting switches of nozzles on the compensation section nozzle group and the working section nozzle group;
in the embodiment of the present invention, based on the step S110, when there is a white space between the current jet printing image and the next jet printing image theoretically, the number of pixels of the offset of the mark point is determined to be a first number according to the offset value; and closing the first number of nozzles on one side, far away from the compensation section nozzle group, in the working section nozzle group, and opening the first number of nozzles, close to the working section nozzle group, in the compensation section nozzle group, wherein the image data of each nozzle is correspondingly translated, so that the adjusted image data can be jet-printed at a correct position when the jet-printing device performs jet-printing next time.
Step S500: and controlling the adjusted nozzle to perform jet printing operation on the object to be printed according to the adjusted image data.
In the embodiment of the invention, after the nozzle on the jet printing device and the image data needing jet printing next time are adjusted, the adjusted nozzle is controlled to execute digital jet printing operation on the object to be printed according to the modified image data, so that the transmission error compensation is completed, the accurate jet printing is realized, and the printed image has better feathering effect. Further, after the inkjet printing device has performed one inkjet printing operation, the process may return to step S100 to perform calibration and inkjet printing for the next inkjet printing.
In the following, an example of a digital inkjet printing method applied to the conduction band printing system is provided in combination with the conduction band printing system described in the above application scenario, where the conduction band printing system includes two compensation modes, and an embodiment of the present invention takes a positive compensation mode (using the a nozzle shown in fig. 2) as an example, and takes a step pixel error of a stepping motor as 1-5 pixels as an example, and a printing effect is a positive deviation according to the step pixel error, at this time, a conveyor belt moves forward more often, and a blank phenomenon may be formed if printing is performed according to a theoretical value. Specifically, in this example, the total number of nozzles of the inkjet printing device is 500, the number of the working segment nozzle groups 31 is 490, the width of the inkjet printing device per scanning printing is 490 pixels (theoretically, the stepping motor controls the distance of the object to be printed by stepping 490 pixels each time), the number of the compensation segment nozzle groups 32 is 10 (10 pixels), and the maximum value of the stepping pixel error is 5 pixels, that is, the maximum value of the stepping pixel error of the compensation segment nozzle groups 32 is twice as large as the maximum value of the stepping pixel error. Based on the maximum value of the pixel error of the stepping motor which steps more than once according to the theoretical stepping length, only positive compensation can occur. Specifically, the following:
the stepping motor step value is changed according to the maximum value of the theoretical step pixel error, 5 pixels are stepped each time (from 490 to 495) to enable the result caused by the transmission error to be blank, the working section nozzle group and the compensation section nozzle group can be controlled according to the number of pixels of the blank area obtained by the camera, for example, the number of pixels of the blank area is 3, three nozzles of the working section nozzle group far away from the compensation section nozzle group are controlled to be closed, three nozzles of the compensation section nozzle group close to the working section nozzle group are opened to form a final working area, all image data to be printed correspondingly translate, the width of the jet printing device which is scanned once is unchanged or 490 pixels, and the transmission error is overcome.
EXAMPLE III
An embodiment of the present invention further provides a conduction band printing system, please refer to fig. 9, which shows a hardware structure of the conduction band printing system capable of executing the digital jet printing method described in fig. 3, 5 to 7. The conduction band printing system 100 may be the conduction band printing system shown in fig. 1.
Specifically, the conduction band printing system 100 includes: controller 11, jet printing device 12, camera 14 and conveyor 16. Wherein,
and the jet printing device 12 is connected with the controller 11, and the camera 14 is arranged along one side of the conveying direction of the conveying device 16. The inkjet printing device 12 may be a printing cart 2 equipped with a head 3 as shown in the above application scenario and fig. 1.
Further, the nozzle 3 may be a nozzle B structure as shown in fig. 2, that is, the printing device 12 is provided with a working segment nozzle group 31 and a compensation segment nozzle group 32, the number of nozzles of the compensation segment nozzle group 32 is less than that of the working segment nozzle group 31, one side of the working segment nozzle group 31 in the conveying direction of the conveying device 16 is provided with the camera 14, and one side of the working segment nozzle group 31 away from the camera 14 is provided with the compensation segment nozzle group 32.
Alternatively, the nozzle 3 may be a nozzle a as shown in fig. 2, that is, the inkjet printing device 12 is provided with an operation stage nozzle group 31 and a compensation stage nozzle group 32, the number of nozzles of the compensation stage nozzle group 32 is less than that of the operation stage nozzle group 31, the camera 14 is provided on one side of the compensation stage nozzle group 32 in the conveying direction of the conveying device 16, and the operation stage nozzle group 31 is provided on one side of the compensation stage nozzle group 32 away from the camera 14.
The camera 14 is connected with the controller 11 and is used for acquiring image data of an object to be printed; the camera 14 may be the camera 4 as described above in the application scenario and shown in fig. 1.
The conveying device 16 is connected with the controller 11 and is used for carrying and conveying the object to be printed; the conveyor 16 may be the drive mechanism 1 and the conveyor belt 6 as described above in the context of the application and as shown in fig. 1. Specifically, the driving mechanism 1 may be a stepping motor, and in this case, the conveying device 16 is provided with a stepping motor and a conveyor belt, the conveyor belt is used for carrying and conveying the object to be printed, the stepping motor is used for controlling the conveyor belt to perform stepping conveying operation, and the number of the nozzles in the compensation stage nozzle group 32 is at least twice of the maximum value of the theoretical stepping pixel error of the conveying device 16.
The conduction band type printing system 100 provided by the embodiment of the invention has the advantages of low manufacturing cost, compact structure and high operation efficiency, and can realize accurate jet printing on an object to be printed and improve the image feathering effect in a stepping compensation mode.
The controller 11 includes: at least one processor 101; and a memory 102 communicatively coupled to the at least one processor 101, with one processor 101 being illustrated in fig. 7. The memory 102 stores instructions executable by the at least one processor 101, and the instructions are executed by the at least one processor 101, so that the at least one processor 101 can execute the digital jet printing method described in fig. 3, 5 to 7. The processor 101 and the memory 102 may be connected by a bus or other means, and fig. 7 illustrates the connection by a bus as an example.
The memory 102, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the digital inkjet printing method in the embodiment of the present application, for example, the modules shown in fig. 5 to 6. The processor 101 executes various functional applications and data processing of the server by running the nonvolatile software programs, instructions and modules stored in the memory 102, that is, the digital jet printing method of the embodiment of the method is realized.
The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the digital jet printing apparatus, and the like. Further, the memory 102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 102 optionally includes memory located remotely from processor 101, which may be connected to a digital jet printing apparatus via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 102, and when executed by the one or more processors 101, perform the digital jet printing method in any of the above-described method embodiments, for example, the method steps of fig. 3, 5 to 7 described above, to implement the functions of the modules and units.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
Embodiments of the present application also provide a non-transitory computer-readable storage medium storing computer-executable instructions, which are executed by one or more processors, for example, to perform the method steps of fig. 3, 5 to 7 described above, and implement the functions of the modules.
Embodiments of the present application further provide a computer program product, including a computer program stored on a non-volatile computer-readable storage medium, where the computer program includes program instructions, which, when executed by a computer, cause the computer to perform the digital jet printing method in any of the above-described method embodiments, for example, to perform the method steps in fig. 3, 5 to 7 described above, and implement the functions of each module.
The embodiment of the invention provides a digital jet printing method and a conduction band type printing system, the system comprises a jet printing device, a conveying device and a camera, wherein a plurality of nozzles are arranged on the jet printing device, each nozzle comprises a working section nozzle group and a compensation section nozzle group which are arranged adjacently, and the camera is arranged on one side of the jet printing device along the conveying direction of the conveying device, the method comprises the steps of firstly moving an object to be printed to a preset jet printing area through the conveying device, jet printing patterns and mark points on the object to be printed, secondly conveying the object to be printed according to a preset advance amount, then shooting the mark points actually jet printed through the camera, determining a step deviation value according to the position of the mark points shot by the camera, then adjusting image data required to be jet printed by the jet printing device according to the step deviation value, and adjusting the switches of the nozzles on the compensation section nozzle groups and the working section nozzle groups, and finally, controlling the adjusted nozzle to perform jet printing operation on the object to be printed according to the adjusted image data, thereby realizing accurate jet printing of the image data.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The digital jet printing method is characterized by being applied to a conduction band type printing system, wherein the system comprises a jet printing device, a conveying device and a camera, a plurality of spray heads are arranged on the jet printing device, each spray head comprises a working section nozzle group and a compensation section nozzle group which are adjacently arranged, the number of nozzles of the compensation section nozzle groups is less than that of the working section nozzle groups, and the method comprises the following steps:
moving the object to be printed to a preset jet printing area through the conveying device, and jet printing patterns and mark points on the object to be printed;
conveying the object to be printed according to a preset advancing amount;
shooting the mark points actually sprayed and printed through the camera, and determining a stepping deviation value according to the positions of the mark points shot by the camera;
adjusting image data required to be subjected to spray printing by the spray printing device according to the stepping deviation value, and adjusting switches of nozzles on the compensation section nozzle group and the working section nozzle group;
and controlling the adjusted nozzle to perform jet printing operation on the object to be printed according to the adjusted image data.
2. The digital jet printing method according to claim 1,
before the object to be printed is moved to a preset jet printing area through the conveying device and patterns and marking points are jet printed on the object to be printed, the method further comprises the following steps:
acquiring a theoretical stepping pixel error of the conveying device;
and adjusting the control parameters of a stepping motor in the conveying device according to the maximum value of the theoretical stepping pixel error.
3. The digital jet printing method according to claim 2,
the number of nozzles on the compensating segment nozzle group is at least twice the maximum value of the theoretical stepping pixel error of the conveyor.
4. The digital jet printing method according to claim 2, wherein before the conveying the object to be printed according to a preset amount of travel, the method further comprises:
setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error;
the conveying of the object to be printed according to the preset advancing amount comprises the following steps:
and according to the preset advancing amount, the object to be printed is transmitted in a stepping mode, so that the mark point can be shot by the camera, and the current jet printing image and the next jet printing image of the object to be printed are overlapped theoretically.
5. The digital jet printing method according to claim 2, wherein before the conveying the object to be printed according to a preset amount of travel, the method further comprises:
setting the preset advancing amount according to the size of the jet printing range of the jet printing device and the maximum value of the theoretical stepping error;
the conveying of the object to be printed according to the preset advancing amount comprises the following steps:
and step-by-step transmitting the object to be printed according to the preset advancing amount so that the mark point can be shot by the camera, and a margin exists between the current jet printing image and the next jet printing image of the object to be printed theoretically.
6. The digital jet printing method according to any one of claims 2 to 5, wherein the step deviation value is determined by shooting the mark points actually jet printed by the camera and according to the positions of the mark points shot by the camera, and the step deviation value comprises:
judging whether the mark point is in a shooting center of the camera or not;
if yes, the stepping deviation value is zero;
and if not, determining the stepping deviation value according to the position relation between the mark point and the shooting center of the camera.
7. The digital jet printing method according to claim 6,
the image data that needs to spout the seal of the seal device is adjusted according to the step deviation value, and the switch of the nozzle on the compensation section nozzle group and the working section nozzle group is adjusted, including:
determining the number of pixels of the mark point offset as a first number according to the stepping deviation value;
and closing a first number of nozzles on one side, far away from the compensation section nozzle group, in the working section nozzle group, and opening a first number of nozzles, close to the working section nozzle group, in the compensation section nozzle group.
8. A conduction band printing system comprising a controller, the controller comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.
9. The conduction band printing system of claim 8, wherein the system further comprises:
the camera is connected with the controller and used for acquiring image data of an object to be printed;
the conveying device is connected with the controller and is used for carrying and conveying the object to be printed;
and the spray printing device is connected with the controller, and the camera is arranged on one side of the conveying direction of the conveying device.
10. The conduction band printing system of claim 9,
the device comprises a conveying device and is characterized in that a stepping motor and a conveying belt are arranged on the conveying device, the conveying belt is used for carrying and conveying the object to be printed, the stepping motor is used for controlling the conveying belt to execute stepping conveying work, and the number of nozzles on a compensation section nozzle group is at least twice of the maximum value of theoretical stepping pixel errors of the conveying device.
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