CN112248651B - Printing device and method and system for correcting chromatic aberration thereof - Google Patents
Printing device and method and system for correcting chromatic aberration thereof Download PDFInfo
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- CN112248651B CN112248651B CN201910662132.3A CN201910662132A CN112248651B CN 112248651 B CN112248651 B CN 112248651B CN 201910662132 A CN201910662132 A CN 201910662132A CN 112248651 B CN112248651 B CN 112248651B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- 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
Abstract
The invention discloses a chromatography deviation rectifying method, which comprises the following steps: when the right-angle triangular marks are pre-printed, controlling a printing device to print the right-angle triangular marks with the preset number and the same size on a medium; filling each right-angle triangular mark with the same color; controlling the media to be fed at a target speed in the X-axis direction after triggering the secondary printing process; receiving a color difference detection result of a sensor arranged above the printing platform, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after calculating the consumed time each time, when the fact that the medium has the offset in the Y-axis direction is judged according to the consumed time, the adjustment amount is obtained through the consumed time, the size of the right-angle triangle and the target speed, and the Y-axis position of the spray head group is adjusted according to the adjustment amount so as to offset the offset of the medium in the Y-axis direction. By applying the scheme of the application, the cost of color register correction is reduced. The application also discloses a printing device and a color register correction system thereof, which have corresponding technical effects.
Description
Technical Field
The invention relates to the technical field of printing control, in particular to a printing device and a method and a system for correcting chromatic aberration of the printing device.
Background
ONEPASS, a term used in the digital printing industry. In the traditional digital printing, due to the size problem of the nozzle group, only scanning printing can be performed, scanning is performed once, the medium advances once, and scanning and medium advancing are performed alternately. ONEPASS is a technique of expanding the size of a head group in the original scanning direction, and is also called continuous printing because scanning is not performed and the medium is continuously advanced.
When the continuous printing is carried out, the medium may move left and right, and the printing nozzle group needs to carry out color register with the printing medium in real time, namely, the printing pattern of the next procedure is in alignment with the printing pattern of the previous procedure in the XY direction, and mainly aims at the color register of the Y-axis direction during the secondary printing. Specifically, when roll media such as wallpaper are printed on the ONEPASS, the process includes two steps, namely, pre-printing is performed firstly, the requirement for the position of the pre-printing is not high, but during secondary printing, the feeding direction, namely the initial position in the X-axis direction, of a printed nozzle group needs to be known, real-time color register needs to be performed in the Y-axis direction, and image deviation caused by left-right movement of the media is avoided.
In the traditional scheme, the real-time position of the pattern in the Y-axis direction is basically acquired by using a visual detection mode and then is provided to a printer, and the printer adjusts the offset of a nozzle group in the Y-axis direction in real time by using a self-contained mechanism, so that the registration in the Y-axis direction is realized. However, this method requires high hardware cost, especially the cost of high-speed cameras and lenses. In addition, since the image vision method is adopted, the requirement on the processing speed of the relevant controller is very high, namely the calculation amount of the controller is very large.
In summary, how to reduce the cost of color correction is a technical problem that those skilled in the art are in urgent need to solve.
Disclosure of Invention
The invention aims to provide a printing device and a method and a system for correcting the color register of the printing device so as to reduce the cost of correcting the color register.
In order to solve the technical problems, the invention provides the following technical scheme:
a color register correction method is applied to an industrial controller and comprises the following steps:
when the right-angle triangular marks are pre-printed, controlling a printing device to print the right-angle triangular marks with the preset number and the same size on a medium; the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; filling the right-angle triangular marks with the same color;
after triggering the secondary printing process, controlling the medium to feed at a target speed in the X-axis direction;
receiving a color difference detection result of a sensor arranged above a printing platform, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; wherein the relative position of the sensor and the nozzle group is kept constant;
after the time consumption is calculated every time, when the fact that the medium deviates in the Y-axis direction is judged according to the time consumption, the adjustment amount is obtained through the time consumption, the size of the right-angle triangular mark and the target speed, and the Y-axis position of the spray head group is adjusted according to the adjustment amount so as to offset the deviation of the medium in the Y-axis direction.
Preferably, each right-angle triangular mark is an isosceles right-angle triangular mark with a waist length of L1;
when the medium is judged to have deviation in the Y-axis direction according to the consumed time, the adjustment amount is obtained according to the consumed time, the size of the right-angle triangle and the target speed, and the adjustment amount comprises the following steps:
judging whether the TxV is equal to a preset target value A or not; t represents the calculated elapsed time, and V represents the target speed;
if yes, determining that the medium does not have offset in the Y-axis direction currently;
if not, determining that the medium currently has an offset in the Y-axis direction, and taking A- (T multiplied by V) as the acquired adjustment amount.
Preferably, the value of the target value a is set to L1/2.
Preferably, the receiving a result of detecting a color difference of a sensor disposed above the printing platform includes:
and receiving a color difference detection result of an optical fiber sensor or a color scale sensor arranged above the printing platform.
Preferably, the sensor arranged above the printing platform is an optical fiber sensor;
the receiving of the detection result of the color difference of the sensor arranged above the printing platform and the calculation of the time spent by the detection point of the sensor to pass through each right-angle triangle mark based on the detection result comprise:
aiming at any one right-angle triangle, at the moment that the detection point of the optical fiber sensor enters the right-angle triangle, the received signal is converted into a second level state from a first level state, at the moment that the detection point of the optical fiber sensor leaves the right-angle triangle, the received signal is converted into the first level state from the second level state, the duration of the received signal in the second level state is counted, and the duration is taken as the time consumed when the detection point of the sensor passes through the right-angle triangle.
Preferably, after the triggering of the printing process and the controlling of the feeding of the medium in the X-axis direction at the target speed, the method further comprises:
when the first right-angle triangle mark is detected, a printing starting signal is sent to the printing main board after a preset first delay, so that the printing main board controls the nozzle group to start printing.
A chromatography correction system comprising:
the industrial controller is used for controlling the printing equipment to print the right-angle triangular marks with the same size in preset quantity on the medium during preprinting; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of a sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after the time consumption is calculated every time, when the fact that the medium deviates in the Y-axis direction is judged according to the time consumption, the adjustment amount is obtained through the time consumption, the size of the right-angle triangular mark and the target speed, and the Y-axis position of the spray head group is adjusted through a Y-axis motor according to the adjustment amount so as to offset the deviation of the medium in the Y-axis direction;
the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; filling the right-angle triangular marks with the same color;
the X-axis motor;
a first driver connecting the X-axis motor and the industrial controller;
the Y-axis motor;
a second driver connecting the Y-axis motor and the industrial controller;
the spray head group is connected with the Y-axis motor;
the sensor is connected with the industrial controller and arranged above the printing platform, and the relative position of the sensor and the sprayer group is kept constant.
Preferably, each right-angle triangular mark is an isosceles right-angle triangular mark with a waist length of L1;
the industrial controller is specifically configured to: the printing device is used for controlling the printing device to print the right-angle triangular marks with the same size and preset number on a medium when the right-angle triangular marks are pre-printed; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of a sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after calculating the consumed time each time, judging whether the TxV is equal to a preset target value A or not; if yes, determining that the medium does not have offset in the Y-axis direction currently; if not, determining that the medium has offset in the Y-axis direction currently, taking A- (T multiplied by V) as an obtained adjustment amount, and adjusting the Y-axis position of the nozzle group through a Y-axis motor according to the adjustment amount to offset the offset of the medium in the Y-axis direction; wherein T represents the calculated elapsed time and V represents the target speed;
preferably, the value of the target value a is set to L1/2.
A printing device comprises the color register correction system.
In the scheme of the application, the sensor is adopted for color difference detection, and the cost is low. The time consumed by the detection point of the sensor to pass through each right-angle triangular mark can be calculated based on the detection result of the chromatic aberration, and the length of the path can be calculated when the detection point of the sensor passes through any one right-angle triangular mark because the target speed is known. The path is parallel to the X-axis direction, and due to the fact that the path is a right-angle triangular mark, the offset of the medium in the Y-axis direction can be calculated according to the length of the path and the size of the right-angle triangular mark, namely the adjustment amount acquired by the industrial controller, and according to the adjustment amount, the Y-axis position of the nozzle group can be adjusted to offset the offset of the medium in the Y-axis direction. Therefore, the scheme of the application realizes the color register correction, and reduces the cost compared with the traditional image vision mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of a method for correcting a color register according to the present invention;
FIG. 2 is a schematic structural diagram of a color register correction system according to an embodiment of the present invention;
FIG. 3 is a dimensional schematic of a right angle triangular marker in accordance with an embodiment of the invention.
Detailed Description
The core of the invention is to provide a color register correction method, which can effectively realize color register correction and reduce the cost compared with the traditional image vision mode.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a color register correction method according to the present invention, which is applied to an industrial controller and includes the following steps:
step S101: when the right-angle triangular marks are pre-printed, controlling a printing device to print the right-angle triangular marks with the preset number and the same size on a medium; the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; each right-angle triangle is filled with the same color.
The industrial Controller described in this application may be selected as a PLC (Programmable Logic Controller), and the implementation of fig. 2 is a scheme that uses a PLC, so that the PLC has strong interference resistance and stability, and may be configured with abundant hardware functional modules, and the actions and processes may be implemented conveniently through programming. Of course, in other embodiments, other types of control components may be used without affecting the practice of the invention.
Specifically, the right-angle triangular mark can be added into the original pre-printed pattern, and when the pre-printed pattern is printed, the original pre-printed pattern and the added right-angle triangular mark can be printed out together. It should be noted that, although the scheme of the present application is generally applied to a situation where two printing processes are originally provided, for a situation where only one printing process is originally provided, that is, a situation where no pre-printed pattern is originally provided, the scheme of the present application may also be used to perform color register correction, that is, in such a situation, only each right-angle triangle mark is printed when step S101 is executed.
The media described herein may typically be web media such as wallpaper. It will be appreciated that the location of the corner cube should be chosen at the edge of the media, i.e. at a location that does not interfere with the printed image.
The number and the size of the printed right-angle triangular marks can be set and selected according to needs, and all the right-angle triangular marks have the same size. However, the application does not limit the distance between the rectangular triangles, i.e. the rectangular triangles may be at equal intervals or at unequal intervals, and of course, the rectangular triangles are usually set at equal intervals in consideration of convenience in printing the rectangular triangles in preprinting.
The first right-angle edge of each right-angle triangle is perpendicular to the feeding direction, the second right-angle edge is parallel to the feeding direction, and each second right-angle edge is located on the same straight line. In particular, it is meant that when the web media is unwound in a plane, each of the second cathetuses is aligned, i.e., each of the right angle triangular marks is aligned along the direction of elongation of the media. Each right-angle triangle mark is filled with the same color, so that the sensor can judge whether the detection point of the sensor is located inside the right-angle triangle mark at present. Of course, in order to improve the recognition accuracy of the sensor, the color used for filling the right-angle triangle may be clearly different from the background color, for example, black is used for filling.
Step S102: after triggering the secondary printing process, the media is controlled to be fed at the target speed in the X-axis direction.
Each of the right-angle triangular marks is printed at the time of preprinting, and after the preprinting is completed, the second printing needs to be performed.
The industrial controller may trigger the process of the secondary printing after receiving the related trigger signal, for example, the worker presses a related button, and the industrial controller may trigger the process of the secondary printing to control the medium to be fed at a target speed in the X-axis direction, i.e., the feeding direction of the medium, or referred to as a moving direction. The feed direction is also shown by the arrows in fig. 2. The target speed is a preset speed, and the specific numerical value can be set according to actual needs.
In an embodiment of the present invention, after step S102, the method may further include:
when the first right-angle triangle is detected, a printing starting signal is sent to the printing main board after a preset first delay, so that the printing main board controls the nozzle group to start printing.
This embodiment allows the initial position in the X-axis direction to be registered.
It will be appreciated that the first right angle triangle will be located before the print start position. At the moment of detecting the first right-angle triangular mark, the distance from the detection point of the sensor to the X-axis direction of the printing starting position is determined, so that the first delay can be set by combining the moving speed of the medium, and the industrial controller sends a printing starting signal to the printing main board after the preset first delay, so that the printing starting position is exactly the position of the printing point in the X-axis direction at the moment of starting printing by the nozzle group.
Of course, when setting the value of the first delay, in order to improve the accuracy, the influence caused by the delay of the transmission of the relevant signal should be considered, so that, in the specific implementation, the value of the first delay can be adjusted through experimental verification, so that the accurate registration can be performed in the X-axis direction.
The printing main board is a component that controls the print contents of the head group, and is not shown in fig. 2.
It should be noted that this embodiment is generally applied to the case of printing a continuous pattern without blank spaces, that is, the registration for the X axis is performed only once at the start of printing. In other embodiments, when printing discontinuous patterns, i.e., when there are blank spaces between the patterns, the registration in the X-axis direction may be performed a plurality of times. For example, the process of performing the registration in the X-axis direction every certain number of triangular marks may refer to the process of performing the registration in the X-axis direction for the first time in this embodiment, and the description will not be repeated.
Step S103: receiving a color difference detection result of a sensor arranged above the printing platform, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; wherein the relative position of the sensor and the group of nozzles is kept constant.
The sensor is disposed above the printing platform, specifically, the probe portion of the sensor is located above the printing platform, for example, in the embodiment of fig. 2, the sensor includes a fiber optic probe, a fiber optic amplifier, and an optical fiber for transmitting signals, wherein the fiber optic probe is located directly above the printing platform.
The sensor can detect color difference, specifically, an optical fiber sensor or a color scale sensor with low cost can be selected, and of course, other types of sensors can be adopted in other embodiments, so that the requirements of the application can be met, namely, the color difference can be detected.
The relative position of the sensor and the nozzle group is kept constant, and particularly, the sensor and the nozzle group can be fixed through a related mechanical structure, so that the sensor falling caused by the movement of the nozzle group is avoided.
The industrial controller may calculate the time consumed for the detection point of the sensor to pass through each of the right-angle triangular marks based on the detection result of the sensor, and may generally calculate the time consumed according to the transition of the level state of the received electric signal.
For example, in an embodiment of the present invention, the sensor disposed above the printing platform is an optical fiber sensor shown in fig. 2, and step S103 may specifically include:
aiming at any one right-angle triangle, at the moment that the detection point of the optical fiber sensor enters the right-angle triangle, the received signal is converted into the second level state from the first level state, at the moment that the detection point of the optical fiber sensor leaves the right-angle triangle, the received signal is converted into the first level state from the second level state, the duration of the received signal in the second level state is counted, and the duration is taken as the time consumed when the detection point of the sensor passes through the right-angle triangle.
For example, in fig. 2, for any one right-angle triangle, when the detection point of the optical fiber sensor does not enter the right-angle triangle, the PLC receives a low level signal, that is, in this embodiment, the first level state is specifically a low level state. And when the detection point of the optical fiber sensor enters the right-angle triangular mark, the signal received by the PLC is changed into high level until the detection point of the optical fiber sensor leaves the right-angle triangular mark, and the signal received by the PLC is changed into low level again. In the process, the duration of the high-level signal is counted, so that the time consumed for the detection point of the sensor to pass through the right-angle triangular mark can be determined.
Step S104: after calculating the consumed time each time, when the fact that the medium has the offset in the Y-axis direction is judged according to the consumed time, the adjustment amount is obtained through the consumed time, the size of the right-angle triangle and the target speed, and the Y-axis position of the spray head group is adjusted according to the adjustment amount so as to offset the offset of the medium in the Y-axis direction.
The Y-axis direction is perpendicular to the X-axis direction, i.e. perpendicular to the feeding direction. When the medium has no left-right deviation, that is, there is no deviation in the Y-axis direction, the time consumed for each calculation should be a fixed value, and of course, since the moving speed of the medium is a preset value, that is, the medium is fed at a fixed target speed, the displacement of the detection point through the rectangular triangle should also be a fixed value.
For any calculated consumed time, if it is determined that the medium has a deviation in the Y-axis direction according to the consumed time, for example, it is determined that the consumed time is different from a preset fixed consumed time, an adjustment amount can be obtained according to the consumed time, the size of the right-angle triangle, and the target speed, so that the Y-axis position of the nozzle group is adjusted according to the adjustment amount to offset the deviation of the medium in the Y-axis direction.
For example, in one embodiment of the present invention, each of the right angle triangular labels is an isosceles right angle triangular label with a waist length of L1;
as described in step S104, when it is determined that the medium has a deviation in the Y-axis direction according to the elapsed time, the following three steps may be specifically included to obtain the adjustment amount according to the elapsed time, the size of the rectangular triangle, and the target speed:
the first step is as follows: judging whether the TxV is equal to a preset target value A or not; t represents the calculated elapsed time, and V represents the target speed;
if yes, executing the second step: otherwise, executing the third step;
the second step is that: determining that the medium does not currently have an offset in the Y-axis direction;
the third step: and determining that the medium has an offset in the Y-axis direction currently, and taking A- (T multiplied by V) as the acquired adjustment amount.
Referring to fig. 3, in the embodiment of fig. 3, the value of the target value a is set to L1/2, and L1 is 10mm, i.e., a is set to 5 mm. The specific value of the target value a may be preset, and the set range is from 0 to L1, and the target value a means: when the medium has no deviation in the Y-axis direction, the detection point of the sensor passes through the length of any path of the right-angle triangle, and the path is called an ideal path for convenience of description. In the embodiment of FIG. 3, when A is L1/2, the path is from point a to point b, and the length is L2, i.e., 5 mm.
When a detection point of the sensor passes through a certain isosceles right triangle mark, the length of the path is T multiplied by V, the path is convenient to describe and called as an actual path, and when the actual path is deviated from an ideal path, the medium is shown to be deviated left and right. According to the geometric property of the isosceles right triangle, the distance between the actual path and the ideal path in the Y-axis direction is equal to the absolute value of the difference between the lengths of the actual path and the ideal path. Thus, the present application subtracts T V from A. The distance between the actual path and the ideal path in the Y-axis direction is the magnitude of a-T × V, and the sign of a-T × V represents whether the medium is currently shifted in the positive Y-axis direction or in the negative Y-axis direction, i.e., in colloquial terms, whether the actual path is to the left or to the right of the ideal path.
It should be noted that, if an ordinary right-angle triangle is selected instead of an isosceles right-angle triangle, the offset between the actual path and the ideal path in the Y-axis direction may also be calculated according to the actual path length T × V, the ideal path length a, and the dimensions of the right-angle triangle, where the dimensions of the right-angle triangle described herein specifically refer to the size of two acute angles, and during the specific calculation, a required calculation result may be obtained based on the basic trigonometric function and the similarity of triangles, which is not described herein.
In the embodiment of fig. 3, the value of the target value a is set to L1/2, considering that the medium may shift to the left or right under normal conditions, and the shift probabilities are close, that is, the value of a is set to L1/2, which is effectively applicable in most cases. In some embodiments, the value of a may also be adjusted for a specific scene, for example, in a specific embodiment, the position of the printing apparatus and the shape setting of the rectangular triangle are both shown in fig. 2, and the probability that the medium is shifted to the left, i.e., to the negative direction of the Y axis is higher, and the shift amplitude is larger, a may be set to a value larger than L1/2, for example, to 0.75 × L1, so that when the medium is shifted to the left more, the rectangular triangle can still be detected by the sensor, i.e., the detection point of the sensor can still pass through the rectangular triangle.
After obtaining the adjustment amount, the industrial controller may adjust the Y-axis position of the nozzle group according to the adjustment amount to counteract the shift of the medium in the Y-axis direction. That is, when the medium shifts to the positive Y-axis direction, the control nozzle group also moves to the positive Y-axis direction by a corresponding distance, and when the medium shifts to the negative Y-axis direction, the control nozzle group also moves to the negative Y-axis direction by a corresponding distance. It can be seen that the size of the adjustment amount determines the moving distance of the head group, and the positive and negative of the adjustment amount determines the moving direction of the head group, and of course, specifically, whether the positive adjustment amount moves in the Y-axis positive direction or the negative adjustment amount moves in the Y-axis positive direction needs to be set in advance by the operator, that is, needs to be set in advance in consideration of the position of the right-angle triangle and the position of the printing apparatus. The positive Y-axis direction and the positive X-axis direction may be set arbitrarily in advance.
It should be noted that, when the industrial controller controls the nozzle group and the medium, the industrial controller may control the nozzle group by using the Y-axis motor, control the medium by using the X-axis motor, and be electrically connected to the corresponding motors by using the relevant servo motor drivers. Specifically, the industrial controller may be connected to a first driver, the first driver being connected to an X-axis motor, the X-axis motor being connected to the medium. Meanwhile, the industrial controller can be connected with a second driver, the second driver is connected with a Y-axis motor, the Y-axis motor is connected with the spray head group, and related transmission mechanisms are usually arranged between the Y-axis motor and the spray head group and between the X-axis motor and the medium.
In the scheme of the application, the sensor is adopted for color difference detection, and the cost is low. The time consumed by the detection point of the sensor to pass through each right-angle triangular mark can be calculated based on the detection result of the chromatic aberration, and the length of the path can be calculated when the detection point of the sensor passes through any one right-angle triangular mark because the target speed is known. The path is parallel to the X-axis direction, and due to the fact that the path is a right-angle triangular mark, the offset of the medium in the Y-axis direction can be calculated according to the length of the path and the size of the right-angle triangular mark, namely the adjustment amount acquired by the industrial controller, and according to the adjustment amount, the Y-axis position of the nozzle group can be adjusted to offset the offset of the medium in the Y-axis direction. Therefore, the scheme of the application realizes the color register correction, and reduces the cost compared with the traditional image vision mode.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a color register correction system, which can be referred to in correspondence with the above.
The color register correction system can comprise:
the industrial controller is used for controlling the printing equipment to print the right-angle triangular marks with the same size in preset quantity on the medium during preprinting; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of the sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after calculating the consumed time each time, when the fact that the medium has the offset in the Y-axis direction is judged according to the consumed time, obtaining an adjustment amount according to the consumed time, the size of the right-angle triangular mark and the target speed, and adjusting the Y-axis position of the spray head group through the Y-axis motor according to the adjustment amount to offset the offset of the medium in the Y-axis direction;
the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; filling each right-angle triangular mark with the same color;
an X-axis motor;
a first driver connecting the X-axis motor and the industrial controller;
a Y-axis motor;
a second driver connecting the Y-axis motor and the industrial controller;
the spray head group is connected with the Y-axis motor;
and the sensor is connected with the industrial controller and arranged above the printing platform, and the relative position of the sensor and the spray head group is kept constant.
In one embodiment of the invention, each right angle triangle is an isosceles right angle triangle with a waist length of L1;
an industrial controller, in particular for: the printing device is used for controlling the printing device to print the right-angle triangular marks with the same size and preset number on a medium when the right-angle triangular marks are pre-printed; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of the sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after calculating the consumed time each time, judging whether the TxV is equal to a preset target value A or not; if yes, determining that the medium does not have offset in the Y-axis direction currently; if not, determining that the medium has offset in the Y-axis direction currently, taking A- (T multiplied by V) as the obtained adjustment quantity, and adjusting the Y-axis position of the nozzle group through a Y-axis motor according to the adjustment quantity to offset the offset of the medium in the Y-axis direction; where T represents the calculated elapsed time and V represents the target speed.
In one embodiment of the present invention, the value of the target value a is set to L1/2.
In one embodiment of the invention, the sensor disposed above the printing platform is an optical fiber sensor or a color scale sensor.
In one embodiment of the present invention, the industrial controller is further configured to: after the printing process is triggered, after the control medium is fed in the X-axis direction at a target speed, when a first right-angle triangular mark is detected, a printing starting signal is sent to the printing main board after a preset first delay, so that the printing main board controls the nozzle group to start printing.
Corresponding to the above method and system embodiments, the embodiment of the present invention further provides a printing apparatus, which may include the color register correction system in any of the above embodiments, and the description is not repeated here.
It is further 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A color register correction method is applied to an industrial controller for realizing color register correction, and comprises the following steps:
when the right-angle triangular marks are pre-printed, controlling a printing device to print the right-angle triangular marks with the preset number and the same size on a medium; the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; filling the right-angle triangular marks with the same color;
after triggering the secondary printing process, controlling the medium to feed at a target speed in the X-axis direction;
receiving a color difference detection result of a sensor arranged above a printing platform, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; wherein the relative position of the sensor and the nozzle group is kept constant;
after the time consumption is calculated every time, when the fact that the medium deviates in the Y-axis direction is judged according to the time consumption, the adjustment amount is obtained through the time consumption, the size of the right-angle triangular mark and the target speed, and the Y-axis position of the spray head group is adjusted according to the adjustment amount so as to offset the deviation of the medium in the Y-axis direction;
wherein the pre-printing represents a first printing and the second printing represents a second printing.
2. The process according to claim 1, wherein each of the right-angle triangular marks is an isosceles right-angle triangular mark having a waist length of L1;
when the medium is judged to have deviation in the Y-axis direction according to the consumed time, the adjustment amount is obtained according to the consumed time, the size of the right-angle triangle and the target speed, and the adjustment amount comprises the following steps:
judging whether the TxV is equal to a preset target value A or not; t represents the calculated elapsed time, and V represents the target speed;
if yes, determining that the medium does not have offset in the Y-axis direction currently;
if not, determining that the medium currently has an offset in the Y-axis direction, and taking A- (T multiplied by V) as the acquired adjustment amount.
3. The process for correcting color running according to claim 2, wherein the value of the target value a is set to L1/2.
4. The method for correcting the color register according to claim 1, wherein the receiving the color difference detection result of the sensor arranged above the printing platform comprises:
and receiving a color difference detection result of an optical fiber sensor or a color scale sensor arranged above the printing platform.
5. The process for correcting the color register according to claim 4, wherein the sensor disposed above the printing platform is an optical fiber sensor;
the receiving of the detection result of the color difference of the sensor arranged above the printing platform and the calculation of the time spent by the detection point of the sensor to pass through each right-angle triangle mark based on the detection result comprise:
aiming at any one right-angle triangle, at the moment that the detection point of the optical fiber sensor enters the right-angle triangle, the received signal is converted into a second level state from a first level state, at the moment that the detection point of the optical fiber sensor leaves the right-angle triangle, the received signal is converted into the first level state from the second level state, the duration of the received signal in the second level state is counted, and the duration is taken as the time consumed when the detection point of the sensor passes through the right-angle triangle.
6. The process of correcting color misregistration method according to any one of claims 1 to 5, further comprising, after controlling the medium to be fed at a target speed in the X-axis direction after the triggering of the secondary printing process:
when the first right-angle triangle mark is detected, a printing starting signal is sent to the printing main board after a preset first delay, so that the printing main board controls the nozzle group to start printing.
7. A chromatography correction system, comprising:
the industrial controller is used for controlling the printing equipment to print the right-angle triangular marks with the same size in preset quantity on the medium during preprinting; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of a sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after the time consumption is calculated every time, when the fact that the medium deviates in the Y-axis direction is judged according to the time consumption, the adjustment amount is obtained through the time consumption, the size of the right-angle triangular mark and the target speed, and the Y-axis position of the spray head group is adjusted through a Y-axis motor according to the adjustment amount so as to offset the deviation of the medium in the Y-axis direction;
the first right-angle edges of the right-angle triangular markers are perpendicular to the feeding direction, the second right-angle edges of the right-angle triangular markers are parallel to the feeding direction, and the second right-angle edges of the right-angle triangular markers are positioned on the same straight line; filling the right-angle triangular marks with the same color;
the X-axis motor;
a first driver connecting the X-axis motor and the industrial controller;
the Y-axis motor;
a second driver connecting the Y-axis motor and the industrial controller;
the spray head group is connected with the Y-axis motor;
the sensor is connected with the industrial controller and arranged above the printing platform, and the relative position of the sensor and the sprayer group is kept constant;
wherein the pre-printing represents a first printing and the second printing represents a second printing.
8. The system of claim 7, wherein each of the right-angle triangular scales is an isosceles right-angle triangular scale having a waist length of L1;
the industrial controller is specifically configured to: when the right-angle triangular marks are pre-printed, controlling a printing device to print the right-angle triangular marks with the preset number and the same size on a medium; after the secondary printing process is triggered, controlling the medium to be fed at a target speed in the X-axis direction through an X-axis motor; receiving a color difference detection result of a sensor, and calculating the time consumed for a detection point of the sensor to pass through each right-angle triangular mark based on the detection result; after calculating the consumed time each time, judging whether the TxV is equal to a preset target value A or not; if yes, determining that the medium does not have offset in the Y-axis direction currently; if not, determining that the medium has offset in the Y-axis direction currently, taking A- (T multiplied by V) as an obtained adjustment amount, and adjusting the Y-axis position of the nozzle group through a Y-axis motor according to the adjustment amount to offset the offset of the medium in the Y-axis direction; where T represents the calculated elapsed time and V represents the target speed.
9. The color register correction system according to claim 8, wherein the value of the target value a is set to L1/2.
10. A printing apparatus comprising the color register correction system according to any one of claims 7 to 9.
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| CN115157865A (en) * | 2022-06-10 | 2022-10-11 | 深圳市印擎科技有限公司 | Printing control method, printing control device, printing system and storage medium |
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