WO2020087920A1

WO2020087920A1 - Method for improving horizontal printing precision and printer applying same

Info

Publication number: WO2020087920A1
Application number: PCT/CN2019/088753
Authority: WO
Inventors: 汤振华; 彭俊甲
Original assignee: 广州精陶机电设备有限公司
Priority date: 2018-10-30
Filing date: 2019-05-28
Publication date: 2020-05-07
Also published as: CN109228663A

Abstract

Disclosed is a method for improving the horizontal printing precision. In the method, N columns of print heads (110) arranged in parallel in a transverse direction of a printer are used to print with the same ink, and printing start points of the N columns of print heads (110) are mutually staggered by 1/N first units (W1), wherein the first unit (W1) is a center-to-center distance between two adjacent orifices (111) of the print heads (110) in the transverse direction of the printer. Further disclosed is a printer applying the method for improving the horizontal printing precision. The printer comprises a conveying platform for conveying a print medium, and a printing system located above the conveying platform. The printing system comprises several printing units (200) arranged in the transverse direction of the printer. Each of the printing units (200) comprises N columns of print heads (110) arranged in parallel in the transverse direction of the printer and used to print with the same ink. The printing start points of the N columns of print heads (110) are mutually staggered by 1/N first units (W1), wherein the first unit (W1) is the center-to-center distance between two adjacent orifices (111) of the print heads (110) in the transverse direction of the printer. The method and the printer can simply and efficiently improve the horizontal printing precision.

Description

Method and printer for improving lateral printing precision

Technical field

This patent relates to the field of industrial printing, and more specifically, to a method and printer for improving the accuracy of horizontal printing.

Background technique

Industrial printers are used to print on mediums with larger sizes, such as tiles, boards, glass, corrugated paper, gussets, etc., and inks of various colors are printed on the printing medium by inkjet and then further processed to obtain the desired pattern. During the printing process, the ink penetrates into the inside of the printing medium through corrosion, which makes the printed pattern not easy to fade, and has the characteristics of waterproof, anti-ultraviolet and anti-scratch.

The ink ejected through the printer nozzle falls on the surface of the printing medium to form ink dots one by one. These ink dots together form the target pattern for printing. The size of the ink dots and the number of ink dots per unit area directly affect the accuracy and quality of printing . The nozzle of the printer is generally provided with a plurality of nozzle holes that are staggered from each other, and the ink is ejected through these nozzle holes and printed on the printing medium. One nozzle hole ejects ink at a time to form an ink dot on the printing medium, so the size of the nozzle hole and The number of spray holes per unit area indirectly affects the accuracy and quality of printing. Due to the limitations of processing technology and inkjet technology, the orifice is often impossible to shrink indefinitely, and its number per unit area cannot be infinitely increased, which restricts the improvement of printing accuracy.

Although there are some cutting-edge technologies to improve the print head, which can achieve higher precision printing, these technologies are in the hands of a few people, and there is an exponential growth relationship between the cost increase of these improved print heads relative to ordinary print heads and the improvement of print accuracy. It is difficult to be widely used.

Summary of the invention

In view of this, the present patent provides a cost-effective, simple and effective method for improving the lateral printing accuracy in order to overcome at least one of the deficiencies described in the prior art. .

In order to solve the above technical problems, this patent adopts the following technical solutions:

A method for improving the accuracy of lateral printing, printing the same ink with N rows of nozzles arranged side by side in the lateral direction of the printer, and offsetting the printing start points between the N rows of nozzles by 1 / N first units, said The first unit is the center distance between two adjacent orifices of the nozzle in the transverse direction of the printer.

This patent uses N rows of nozzles arranged side by side in the lateral direction of the printer to print the same ink. In the N rows of nozzles, the nozzles of the same row and different rows are located on the same straight line parallel to the lateral direction of the printer. The starting point of printing is offset by 1 / N first unit from each other, the printing accuracy can be increased to N times the original, the method is simple and effective, there is no need to improve the original nozzle, and there is no need to replace the cost not only the cost of the original nozzle N-times higher-precision nozzle is economical and practical, which is conducive to market promotion. The lateral direction of the printer described in this patent is a direction parallel to the conveying direction of the printing medium, and the longitudinal direction of the printer is a direction perpendicular to the conveying direction of the printing medium. Considering various factors such as print accuracy requirements, nozzle cost, and rationalization of the printer structure, the number N of columns of the nozzle is preferably 2 to 4.

The print head is a very precise component, which means that its price is correspondingly more expensive. It is well known that in industrial printing, the format of the printing medium is generally large. Usually, several print heads arranged in rows are used to complete a complete format. Print, instead of printing a full format with a large, separate column of print heads, otherwise the cost of replacement will be very high if the print head fails. But the problem that comes with it is that there is often a certain distance between two adjacent nozzles in the same row of nozzles, and the actual print length of the nozzle is usually less than the total length of the nozzle, and some of the two ends of the nozzle cannot be printed. As a result, the accuracy and quality of the printing pattern corresponding to this position are relatively weak. Therefore, in this patent, M printing units arranged in the transverse direction of the printer are used to print the same ink, and the M printing units are arranged between the printing units in the longitudinal direction of the printer. 1 / M second units are staggered from each other, and each of the printing units includes the N rows of nozzles, and the second unit is a center distance between two adjacent nozzles in the longitudinal direction of the printer in any column. The second unit is not greater than M times the actual print length of the nozzle in the longitudinal direction of the printer. In short, this patent uses M printing units that are offset by 1 / M of the second unit in the longitudinal direction of the printer to compensate for the gap between two adjacent nozzles on the same row of nozzles, so that the entire printing format is directly above Both are covered by nozzles that can eject ink. The larger the number of printing units, the greater the span of all the nozzles in the lateral direction of the printer, which is not conducive to the simplification of the printer structure. Therefore, the number M of the printing units is preferably 2 to 3.

In order to further improve the printing accuracy of the printer in the vertical direction, this patent uses the N rows of nozzles arranged on the same printing module on the printer to print the same ink, that is, the nozzles that print the same ink in N rows are set in the same printing mode In terms of grouping, it is better and easier to ensure the position accuracy of the N-row nozzles, reduce the difficulty of assembly, improve the assembly efficiency, and promote the realization of the method.

For the method of printing the same ink with M printing units, M printing units arranged in the lateral direction of the printer on the same printing module on the printer are used to print the same ink, that is, M printing units that print the same ink are uniformly set at On the same printing module, it is better and easier to ensure the position accuracy of the M printing units relative to each other, reduce the difficulty of assembly, improve the assembly efficiency, and promote the implementation of the method.

Another object of this patent is to provide a printer applying the above method for improving lateral printing accuracy, including a conveying platform for conveying printing media and a printing system located above the conveying platform, the printing system including a plurality of rows arranged in the lateral direction of the printer A printing unit for cloth, the printing unit includes N rows of nozzles for printing the same ink arranged side by side in the lateral direction of the printer, and the printing start points between the N rows of nozzles are shifted from each other by 1 / N first units, the first One unit is the center distance between two adjacent orifices of the nozzle in the transverse direction of the printer.

This patent uses N rows of nozzles arranged side by side in the lateral direction of the printer to print the same ink. In the N rows of nozzles, the nozzles of the same row and different rows are located on the same straight line parallel to the lateral direction of the printer. The starting point of printing is shifted by 1 / N first unit from each other, the printing accuracy can be increased to N times the original, the structure is simple, there is no need to improve the original nozzle, and there is no need to replace the cost more than the original nozzle cost N Double times higher precision nozzle, economical and practical, conducive to market promotion. The lateral direction of the printer described in this patent is a direction parallel to the conveying direction of the printing medium, and the longitudinal direction of the printer is a direction perpendicular to the conveying direction of the printing medium. Considering various factors such as printing accuracy requirements, nozzle cost, rationalization of the printer structure, etc., the number N of columns of the nozzle is preferably 2 to 4.

The print head is a very precise component, which means that its price is correspondingly more expensive. It is well known that in industrial printing, the format of the printing medium is generally large. Usually, several print heads arranged in rows are used to complete a complete format. Print, instead of printing a full format with a large, separate column of print heads, otherwise the cost of replacement will be very high if the print head fails. But the problem that comes with it is that there is often a certain distance between two adjacent nozzles in the same row of nozzles, and the actual print length of the nozzle is usually less than the total length of the nozzle, and some of the two ends of the nozzle cannot be printed. As a result, the accuracy and quality of the printing pattern corresponding to this position are relatively weak. For this reason, every M printing units print the same ink, and the M printing units are shifted from each other by 1 / M second units in the longitudinal direction of the printer. The second unit is the center distance between two adjacent nozzles of any row of nozzles in the longitudinal direction of the printer. The second unit is not greater than M times the actual print length of the nozzle in the longitudinal direction of the printer. In short, this patent uses M printing units that are offset by 1 / M of the second unit in the longitudinal direction of the printer to compensate for the gap between two adjacent nozzles on the same row of nozzles, so that the entire printing format is directly above Both are covered by nozzles that can eject ink. The larger the number of printing units, the greater the span of all the nozzles in the lateral direction of the printer, which is not conducive to the simplification of the printer structure. Therefore, the number M of the printing units is preferably 2 to 3.

To further improve the printing accuracy of the printer in the longitudinal direction, the printing system includes several printing modules, and each printing module includes at least one printing unit. The printing units with nozzles that print the same ink in N rows are uniformly arranged on the same printing module, which can better and more easily ensure the position accuracy of the nozzles in the N rows, reduce assembly difficulty, improve assembly efficiency, and promote the implementation of the method .

The printing module includes a spray head and a tray for mounting the spray head, and the tray is provided with a multiple of N mounting holes for mounting the spray head. This patent uses a tray to position and install the nozzles. The tray is provided with a number of mounting holes, and each mounting hole corresponds to a nozzle. Therefore, as long as the relative positional relationship of each mounting hole in the tray is ensured, the nozzles can be easily secured. Position relationship, thus effectively ensuring higher printing accuracy.

For a printer that uses M printing units to print the same ink, the printing system includes several printing modules, each printing module includes M printing units, the printing module includes a nozzle and a tray for installing the nozzle, The tray is provided with a mounting hole for mounting the spray head with an M multiple of N.

Compared with the prior art, this patent has the following beneficial effects: this patent uses N rows of nozzles arranged side by side in the lateral direction of the printer to print the same ink. In the N rows of nozzles, the nozzles of the same row and different rows are located in the same direction as the printer lateral direction On parallel straight lines, the printing start points between the N rows of nozzles are shifted from each other by 1 / N first unit, the printing accuracy can be increased to N times, the method is simple and effective, and no need to improve the original nozzle It also does not need to be replaced with a higher precision spray head whose cost is more than N times the cost of the original spray head. It is economical and practical, which is conducive to market promotion.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a printing unit and its formation of ink dots on a printing medium.

FIG. 2 is a partially enlarged view of part A in FIG. 1.

Fig. 3 is an installation schematic diagram of two printing units printing the same ink.

FIG. 4 is a partially enlarged view of part B in FIG. 3.

FIG. 5 is a schematic diagram of the tray of Embodiment 3 of the device.

Fig. 6 is a schematic diagram 1 of a tray in Embodiment 4 of the device.

Fig. 7 is a second schematic diagram of the tray in Embodiment 4 of the device.

DESCRIPTION OF REFERENCE NUMERALS: spray head 110, spray hole 111, tray 120, mounting hole 121, printing unit 200, first unit W1, second unit W2.

detailed description

The drawings are for illustrative purposes only, and cannot be construed as a limitation to this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size; For the personnel, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are for illustrative purposes only, and cannot be construed as limitations to this patent. The patent will be further described in detail below in conjunction with specific embodiments.

Method Example 1

A method for improving the lateral printing accuracy, printing the same ink with two rows of nozzles 110 arranged side by side in the lateral direction of the printer, and offsetting the printing start points between the two rows of nozzles 110 by 1/2 first unit W1 The first unit W1 is the center distance between two adjacent nozzle holes 111 of the nozzle 110 in the lateral direction of the printer. In this embodiment, two rows of nozzles 110 arranged side by side in the lateral direction of the printer are used to print the same ink. In the two rows of nozzles 110, the nozzles 110 of the same row and different rows are located on the same straight line parallel to the lateral direction of the printer. The printing start points between the two rows of nozzles 110 are offset by 1/2 of the first unit W1, and the printing accuracy can be increased to twice the original. The method is simple and effective, and there is no need to improve the original nozzle 110 or replace it. The cost is not only the higher-precision nozzle 110 which is twice the cost of the original nozzle 110, but also economical and practical, which is conducive to market promotion.

In addition, as an extension of the method described in this embodiment, we can also use three, four or more columns (N columns) of nozzles 110 to print the same ink, and accordingly, the printing starting point between the nozzles 110 of each column 1/3, 1/4 or 1 / N first units W1 are shifted from each other. Considering various factors such as the printing accuracy requirements, the cost of the nozzle 110, and the rationalization of the printer structure, the number of columns of the nozzle 110 is preferably 2 to 4.

Method Example 2

As an improvement of the above method embodiment, in this embodiment, two printing units 200 arranged in the transverse direction of the printer are used to print the same ink, and the two printing units 200 are shifted from each other by 1/2 in the longitudinal direction of the printer A second unit W2, the second unit W2 is the center distance between two adjacent nozzles 110 of any row of nozzles 110 in the longitudinal direction of the printer. Each of the printing units 200 includes 2 rows of nozzles 110 arranged in the transverse direction of the printer, and in the longitudinal direction of the printer, the two rows of nozzles 110 are offset from each other by 1/2 first unit W1, and the first unit W1 It is the center distance between two adjacent nozzle holes 111 of the nozzle 110 in the longitudinal direction of the printer.

The nozzle 110 is a very precise component, which means that its price is relatively expensive. It is well known that in industrial printing, the size of the printing medium is generally large. Usually, several nozzles 110 arranged in rows are used to complete a complete Format printing, instead of printing a complete format with a large, individually arranged nozzle 110, otherwise the cost of replacement will be very high if the nozzle 110 fails. However, the following problem is that there is often a certain distance between two adjacent nozzles 110 in the same row of nozzles 110, and the actual print length of the nozzle is usually less than the total length of the nozzle. As a result, the accuracy and quality of the print pattern corresponding to this position are relatively weak. Therefore, in this embodiment, two printing units 200 that are offset from each other in the longitudinal direction of the printer by 1/2 second unit W2 compensate for the same row of nozzles 110 The blank space between the two adjacent nozzles 110 makes the entire printing format directly above the nozzle 111 that can eject ink. In order to make the most of the effective printing length, the length of the second unit W2 is usually not more than twice the actual print length of the print head. The distance of a dozen orifices.

In addition, as an extension of the method described in this embodiment, we can also use three, four, or more (M) printing units 200 to print the same ink, and accordingly, each printing unit in the longitudinal direction of the printer The second units W2 are offset from each other by 1/3, 1/4 or 1 / M, and the length of the second unit W2 is less than 3 times, 4 times or M times the actual print length of the nozzle. The larger the number of the printing units 200 means that the span of all the nozzles 110 in the lateral direction of the printer will be larger, which is not conducive to the simplification of the structure of the printer. Therefore, the number of the printing units 200 is preferably 2-3.

Method Example 3

As an improvement of the above method embodiment, this embodiment uses two rows of nozzles 110 or two printing units 200 of the same printing module on the printer to print the same ink, that is, two rows of nozzles 110 printing the same ink or two printing the same ink The printing unit 200 is uniformly arranged on the same printing module, which can better and more easily ensure the position accuracy between the nozzle 110 and the nozzle 110, and between the printing unit 200 and the printing unit 200, reduce assembly difficulty, and improve assembly efficiency.

Equipment Example 1

A printer applying the above method for improving lateral printing accuracy includes a conveying platform for conveying printing media and a printing system located above the conveying platform. The printing system includes a plurality of printing units 200 arranged in the lateral direction of the printer. The printing unit 200 includes two rows of print heads 110 that print the same ink side by side in the lateral direction of the printer, and the printing start points between the N rows of print heads 110 are offset from each other by 1/2 first units W1, and the first units W1 It is the center distance between two adjacent nozzle holes 111 of the nozzle 110 in the lateral direction of the printer.

This patent uses two rows of nozzles 110 arranged side by side in the lateral direction of the printer to print the same ink. Among the two rows of nozzles 110, the nozzles 110 of the same row and different rows are located on the same straight line parallel to the lateral direction of the printer. The printing start points of the column nozzles 110 are offset by 1/2 of the first unit W1, and the printing accuracy can be increased to twice the original one. The structure is simple, and there is no need to improve the original nozzle 110 or replace the cost. It is a high-precision nozzle 110 that is twice the cost of the original nozzle 110. It is economical and practical, and is conducive to market promotion.

In addition, as an extension of the printer described in this embodiment, we can also use three, four or more columns (N columns) of nozzles 110 to print the same ink, and accordingly, the printing starting point between the nozzles 110 of each column 1/3, 1/4 or 1 / N first units W1 are shifted from each other. Considering various factors such as the printing accuracy requirements, the cost of the nozzle 110, and the rationalization of the printer structure, the number of columns of the nozzle 110 is preferably 2 to 4.

Device Example 2

As an improvement of the above method embodiment, in this embodiment, every two printing units 200 print the same ink, and the two printing units 200 are offset from each other by 1/2 second unit W2 in the longitudinal direction of the printer. The second unit W2 is the center distance between two adjacent heads 110 of any row of heads 110 in the longitudinal direction of the printer.

In addition, as an extension of the printer described in this embodiment, we can also use three, four, or more (M) printing units 200 to print the same ink, and accordingly, each printing unit in the longitudinal direction of the printer The second units W2 are offset from each other by 1/3, 1/4 or 1 / M, and the length of the second unit W2 is less than 3 times, 4 times or M times the actual print length of the nozzle. The larger the number of printing units 200 means that the span of all the nozzles 110 in the lateral direction of the printer will be larger, which is not conducive to the simplification of the structure of the printer. Therefore, the number of the printing units 200 is preferably two.

Device Example 3

As an improvement of the above device embodiment, the printing system in this embodiment includes several printing modules, and each printing module is a printing unit 200. The printing module includes a nozzle 110 and a tray 120 for installing the nozzle 110. The tray 120 is provided with two rows of mounting holes 121 for installing the nozzle 110, and two rows of mounting holes 121 in the same row and different rows of mounting holes 121 is located on the same straight line parallel to the transverse direction of the printer, and the printing start points between the nozzles 110 installed in the mounting holes 121 of the two rows are offset by 1/2 of the first unit W1, and the first unit W1 is the nozzle 110 The center distance between two adjacent nozzle holes 111 in the lateral direction of the printer.

In this embodiment, the tray 120 is used to position and install the spray head 110. The tray 120 is provided with a plurality of mounting holes 121, each of which corresponds to one spray head 110. Therefore, as long as the relative positional relationship of each mounting hole 121 in the tray 120 is ensured, It is easy to ensure the positional relationship between the nozzles 110, thereby effectively ensuring a high printing accuracy.

Device Example 4

As an improvement of the above device embodiment, the printing system in this embodiment includes several printing modules, and each printing module includes two printing units 200, A and B. The printing module includes a nozzle 110 and a tray 120 for installing the nozzle 110. The tray 120 is provided with two rows of mounting holes 121 for installing the nozzle 110 of the printing unit a and two rows for installing the printing unit b The mounting holes 121 of the nozzle 110; the two rows of mounting holes 121 of the same printing unit 200, the mounting holes 121 of different rows in the same row are located on the same straight line parallel to the lateral direction of the printer, and are installed in the two rows of mounting holes 121 of the same printing unit 200 The printing start points of the nozzles 110 are offset from each other by 1/2 first unit W1, and the first unit W1 is the center distance between two adjacent nozzle holes 111 of the nozzle 110 in the transverse direction of the printer; The mounting holes 121 between the different printing units 200 in the direction are offset from each other by 1/2 second units W2, and the second unit W2 is the center distance between two adjacent nozzles 110 of any row of the nozzles 110 in the longitudinal direction of the printer .

The four rows of mounting holes 121 on the tray 120 may be the nozzles 110 for each adjacent two rows of mounting holes 121 for mounting the same printing unit 200, or two rows of mounting holes 121 for mounting the nozzles of the same printing unit 200 110.

Obviously, the above-mentioned embodiments of this patent are merely examples for clearly illustrating this patent, rather than limiting the implementation of this patent. For those of ordinary skill in the art, other different forms of changes or changes can be made based on the above description. There is no need to exhaustively list all implementations. Any modification, equivalent replacement and improvement made within the spirit and principle of this patent shall be included in the protection scope of this patent claim.

Claims

A method for improving the accuracy of lateral printing, characterized by printing the same ink with N rows of nozzles arranged side by side in the lateral direction of the printer, and offsetting the printing start points between the N rows of nozzles by 1 / N first Unit, the first unit is the center distance between two adjacent orifices of the nozzle in the lateral direction of the printer.
The method for improving the horizontal printing accuracy according to claim 1, wherein M printing units arranged in the horizontal direction of the printer are used to print the same ink, and the M printing units are mutually aligned in the longitudinal direction of the printer Staggered by 1 / M second units, each of the printing units includes the N rows of nozzles, and the second unit is a center distance between two adjacent nozzles of any column of nozzles in the longitudinal direction of the printer.
The method for improving the lateral printing accuracy according to claim 1 or 2, characterized in that the same ink is printed with N rows of nozzles arranged on the same printing module of the printer along the lateral direction of the printer.
The method for improving the lateral printing accuracy according to claim 2, wherein M printing units arranged in the lateral direction of the printer on the same printing module on the printer are used to print the same ink.
The method for improving the horizontal printing accuracy according to claim 1, wherein the number N of rows of the head is 2 to 4.
A printer applying the method according to claims 1 to 5, characterized in that it includes a conveying platform for conveying printing media and a printing system located above the conveying platform, the printing system includes a plurality of prints arranged in the lateral direction of the printer Unit, the printing unit includes N rows of printheads that print the same ink side by side in the lateral direction of the printer, and the printing start points between the N rows of printheads are offset from each other by 1 / N first units, and the first unit is The center distance between two adjacent orifices of the nozzle in the transverse direction of the printer.
The printer according to claim 6, wherein each M printing units print the same ink, and the M printing units are shifted from each other by 1 / M second units in the longitudinal direction of the printer, the second units It is the center distance between two adjacent nozzles in the longitudinal direction of the printer for any row of nozzles.
The printer according to claim 6 or 7, wherein the printing system includes a plurality of printing modules, and each printing module includes at least one printing unit.
The printer according to claim 8, characterized in that the printing module includes a nozzle and a tray for installing the nozzle, and the tray is provided with multiple rows of N mounting holes for installing the nozzle.
The printer according to claim 7, wherein the printing system includes a plurality of printing modules, each printing module includes M printing units, and the printing module includes a nozzle and a tray for installing the nozzle. The tray is provided with M multiple rows of N for mounting holes for mounting the spray head.