CN117162667A - Quick printing method and quick printing device of ink-jet printer - Google Patents

Abstract

The application relates to the technical field of ink-jet printing, and provides a quick printing method and a quick printing device of an ink-jet printer, wherein the method comprises the following steps: s1: the paper continuously moves along the length direction of the paper; arranging M rows of nozzles along the length direction of the paper, wherein the interval between two adjacent rows of nozzles is M multiplied by N times of the unit point distance, and the unit point distance is the distance between two pixel points of a printed finished product; m is a natural number greater than or equal to 2; n is a natural number greater than or equal to 1; s2: simultaneously igniting M rows of nozzles at intervals of a first designated time, wherein each nozzle is ignited to drop one ink drop at most, each ink drop corresponds to one pixel point, the distance between the ink drops which are ignited and dripped every two times is M times of the unit point distance, and the two ink drops are ignited for N times; s3: pause the ignition for a second designated time; the ratio of the second specified time to the first specified time is M-1: m; s4: and repeating the step S2 and the step S3 until printing is completed. The scheme can effectively improve the printing speed and prevent the white line from influencing the printing effect.

Description

Quick printing method and quick printing device of ink-jet printer

Technical Field

The application relates to the technical field of ink-jet printing, in particular to a quick printing method and a quick printing device of an ink-jet printer.

Background

Printing is an ancient technology, but is continuously updated, and with the continuous development of printing technology, inkjet-based digital printing systems have become very popular and have gained wide social acceptance. Many digital printing devices are responsible for various types of printing tasks, which differ in the use of different nozzles, as well as in different performance parameters and quality indicators.

Single pass (also known as 1pass or single pass) printing is to arrange the heads in a row, hold the paper stationary, and move the paper rapidly under the heads, with each nozzle of the heads ejecting ink droplets at a fixed frequency, which form a line on the paper. The plurality of nozzles arranged form a plurality of such parallel lines on the paper, and the dense lines form a square. As shown in fig. 1, the printed pattern is formed by ink in some places and ink in other places in the square. It is apparent that if a line of ink is to maintain the same density, the higher the frequency of ejection of ink from the nozzle, the faster the paper is moving. It is the firing frequency, i.e., the frequency at which the nozzle ejects ink, that determines the printing speed, and the higher the firing frequency, the faster the printing speed. And high firing frequency spray heads tend to be expensive and difficult to maintain.

The prior art solution is that a row of nozzles are arranged side by side, and each nozzle independently controls the ignition time, so that a complete pattern is ejected, as shown in fig. 2. The printing speed in the prior art completely depends on the ignition frequency, and the ignition frequency is not greatly increased. Furthermore, if a certain nozzle is clogged, a white line appears, as shown in fig. 3, and the printing effect is deteriorated, and the probability of nozzle clogging is very high.

Accordingly, it is desirable to provide a fast printing method and a fast printing apparatus for an inkjet printer capable of effectively improving a printing speed and preventing the occurrence of a white line to affect a printing effect.

The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

The application mainly aims to solve the problem of low printing efficiency of an inkjet printer, and provides a rapid printing method and a rapid printing device of the inkjet printer, which can effectively improve the printing speed and prevent a white line from influencing the printing effect.

To achieve the above object, a first aspect of the present application provides a method for rapid printing by an inkjet printer, comprising the steps of:

s1: the paper continuously moves along the length direction of the paper;

arranging M rows of nozzles along the length direction of the paper, wherein the interval between two adjacent rows of nozzles is M multiplied by N times of the unit point distance, and the unit point distance is the distance between two pixel points of a printed finished product; m is a natural number greater than or equal to 2; n is a natural number greater than or equal to 1;

s2: simultaneously igniting M rows of nozzles at intervals of a first designated time, wherein each nozzle is ignited to drop one ink drop at most, each ink drop corresponds to one pixel point, the distance between the ink drops which are ignited and dripped every two times is M times of the unit point distance, and the two ink drops are ignited for N times;

s3: pause the ignition for a second designated time; the ratio of the second specified time to the first specified time is M-1: m;

s4: and repeating the step S2 and the step S3 until printing is completed.

According to an exemplary embodiment of the present application, in step S1, the colors of the inks of the M rows of nozzles are uniform.

According to an exemplary embodiment of the present application, N is an integer multiple of 2, and the resolution in the length direction of the paper is n×12.5dpi.

According to an exemplary embodiment of the present application, the number of nozzles per row is 800 or more, and the distance of the nozzles per row in the width direction of the sheet is one unit dot pitch.

According to an exemplary embodiment of the present application, each row of nozzles comprises two rows of nozzles that are offset, the number of nozzles in each row being greater than or equal to 400.

According to an exemplary embodiment of the present application, adjacent two nozzles in each row of nozzles are 2 unit dot distances apart.

Preferably, M is 4, N is 48, and the unit point distance is 1/600 inch.

According to an exemplary embodiment of the present application, in step S2, the pixel points that do not need to be printed do not drip ink droplets.

According to an exemplary embodiment of the present application, in step S2, the first row of nozzles need not drop ink droplets at the nth firing.

As a second aspect of the present application, there is provided a rapid printing apparatus capable of realizing the rapid printing method.

According to an example embodiment of the present application, the rapid printing apparatus includes an ink tank, a printhead, and a control unit;

the ink tank is connected with the printing head and is used for providing ink;

the printhead includes M rows of nozzles;

the control unit is communicatively coupled to the printhead for controlling the printhead to fire and drop ink onto the paper.

The application has the advantages that the scheme is provided with M rows of nozzles, the ignition interval time is adjusted every N times of ignition, the high-frequency effect is output by using the low-frequency ignition frequency, the cost of the spray head is reduced, the defects caused by the blockage of the spray holes are lightened, and the printing speed is increased by M-1 times.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are only some embodiments of the present application and other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 schematically illustrates a print effect diagram of a single pass.

Fig. 2 schematically shows a print effect diagram of a row of nozzles side by side.

Fig. 3 schematically shows a print effect of a row of nozzles side by side and blocked orifices.

Fig. 4 schematically shows a schematic of M rows of nozzles of a printhead.

Fig. 5 schematically shows a printhead structure (without ink channels).

Fig. 6 schematically shows a printhead structure (ink-containing channel).

Fig. 7 schematically shows a step diagram of a fast printing method of an inkjet printer.

Fig. 8 schematically illustrates a multicolor jet printing schematic.

Fig. 9 schematically illustrates a printing schematic of an inkjet printer rapid printing method.

Fig. 10 schematically shows a comparison of ink ejection effects.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.

The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another element. Accordingly, a first component discussed below could be termed a second component without departing from the teachings of the present inventive concept. As used herein, the term "and/or" includes any one of the associated listed items and all combinations of one or more.

Those skilled in the art will appreciate that the drawings are schematic representations of example embodiments and that the modules or flows in the drawings are not necessarily required to practice the application and therefore should not be taken to limit the scope of the application.

According to a first embodiment of the present application, a fast printing apparatus is provided that includes an ink tank, a printhead, and a control unit.

An ink tank is connected to the printhead for providing ink.

The printhead includes M rows of nozzles and M ink channels.

The control unit is communicatively coupled to the printhead for controlling the printhead to fire and drop ink onto the paper.

As shown in fig. 4, 5 and 6, M rows of nozzles are provided at the bottom of the printhead for ejecting ink to the paper under the printhead. Every two rows of adjacent nozzles are spaced apart by a specified distance, which is N x M unit dot distances. The unit dot distance is the distance between two pixel dots of the printed product. The number of the nozzles in each row is greater than or equal to 800, and the distance of the nozzles in each row in the width direction of the paper is one unit point distance. Each row of nozzles comprises two rows of staggered nozzles, and the number of the nozzles in each row is greater than or equal to 400. Adjacent two nozzles in each row of nozzles are separated by 2 unit point distances. By the way of the offset arrangement, the printing effect is practically the same as the effect of arranging a plurality of nozzles per row, and the effect of spacing every two nozzles by one unit dot distance can be considered that the number of the nozzles per row is greater than or equal to 800.

Specifically, M is 4, two adjacent rows of nozzles are spaced apart by 8.128mm (i.e., a distance of 192 pixels, i.e., a distance of 192/600 inch), two adjacent columns of nozzles are spaced apart by 1.016mm (i.e., a distance of 24 pixels), two adjacent columns of nozzles are spaced apart by 0.085mm (i.e., a distance of 2 pixels), 400 nozzles are provided in each column, and two adjacent columns of nozzles of the same serial number are spaced apart by 0.042mm (i.e., a distance of 1 pixel) in the width direction of the sheet. In fig. 4, there are 8 rows of nozzles, and as shown in fig. 5, the rows a, B, C, D, E, F, G, and H are respectively arranged from right to left, and the adjacent rows are staggered to improve the resolution of the ink jet. As shown in fig. 6, the number of ink channels is four from right to left, the first is in communication with columns B and G, the second is in communication with columns a and H, the third is in communication with columns C and F, and the fourth is in communication with columns D and E. The colors of the four ink channels are consistent, so that the colors of the ink of the M rows of nozzles are consistent. The ink channels are connected in two non-adjacent rows to eliminate the influence of static electricity.

The control unit instructs the printing head to fire M rows of nozzles at the same time every first appointed time, each time fires one nozzle to drop one ink drop at most, each ink drop corresponds to one pixel point, M-1 pixel points are arranged between every two rows of ink drops, namely, the distance between every two ink drops which fire and drop is M times of the unit point distance, the firing is carried out for N times, and the firing is carried out for N times as a group; and stopping the second designated time between each group of ignition, and repeating the plurality of groups of ignition until printing is completed. The ratio of the second specified time to the first specified time is M-1: m.

According to a second embodiment of the present application, there is provided a method for rapid printing by an inkjet printer employing the rapid printing apparatus of the first embodiment, as shown in fig. 7, comprising the steps of:

s1: the sheet continues to move along the length of the sheet.

The paper moves on the digital printer, an encoder on the printer changes along with the position of the paper, and the control board card determines the current position of the paper according to the scale on the encoder and whether ignition is needed. By adopting the method of the scheme, the paper movement speed can be (M-1) times faster. Assuming that the ink jet resolution along the length of the paper is 600dpi, the firing frequency of the nozzle is 21 khz, and four ink channels, the maximum speed of paper movement is 21000/600×25.4=889 mm/s and 53.3 m/min in the conventional dot-by-dot ink jet manner, and the printing speed can be increased by a factor of 3, namely 160 m/min by the method according to the scheme.

Arranging M rows of nozzles along the length direction of the paper, wherein the interval between two adjacent rows of nozzles is M multiplied by N times of the unit point distance, and the unit point distance is the distance between two pixel points of a printed finished product; m is a natural number greater than or equal to 2; n is a natural number greater than or equal to 1.

Every two rows of adjacent nozzles are spaced apart by a specified distance, which is N x M unit dot distances. Each row of nozzles comprises two rows of staggered nozzles, and the number of the nozzles in each row is greater than or equal to 400.

The colors of the inks of the M rows of nozzles are uniform.

Preferably, M is 4, N is 48, and the unit point distance is 1/600 inch.

S2: and simultaneously igniting the M rows of nozzles at intervals of a first designated time, wherein each nozzle is ignited to drop one ink drop at most, each ink drop corresponds to one pixel point, the distance between the ink drops which are ignited and dripped at each time is M times of the unit point distance, and the two ink drops are ignited for N times.

The pixels that do not need to be printed do not drip ink droplets.

The number of ignitions is determined by the unit point distance, the distance between the two rows of nozzles and the number of rows of nozzles. N is an integer multiple of 2, the resolution in the longitudinal direction of the sheet is N×12.5dpi, and the unit dot pitch is 1/(N×12.5) inches.

Preferably, since the first row of nozzles overlap with the subsequent nozzles in the nth firing, the first row of nozzles need not drop ink droplets in the nth firing in order to reduce repetitive ink ejection.

S3: the second specified time of the pause ignition is calculated, and the ratio of the second specified time to the first specified time is M-1: m;

s4: and repeating the step S2 and the step S3 until printing is completed.

Repeating step S2 and step S3 for M times.

The following describes the advantages of the method of fast printing by an inkjet printer by way of detailed examples.

Fig. 8 shows a schematic printing view of a multicolor spray head. The multi-color nozzle is provided with a plurality of rows of spray holes which are distributed side by side, and each row of spray holes is used for spraying ink with different colors, typically CMYK four-color ink, and four colors of CMYK are respectively arranged from left to right in fig. 8. As the paper moves, four color ink droplets are ejected at the same position, and various colors are presented due to different combinations of inks, thereby realizing color printing.

The basic idea of the scheme is to let the multicolor spray holes spray the same color and stagger the inking points, so that the ink is not printed at the same position, the four spray holes print different rows respectively, the four spray holes are mutually crossed and complemented, and the different spray nozzles do not print on the same pixel point, so as to form a complete image. In fact, each row of nozzles is described herein as comprising two rows (as shown in fig. 4 and 5) offset from each other, closely spaced to enhance lateral resolution, and for ease of description, a total of 4 rows are still described herein.

As shown in fig. 9, for the Epson i3200 head, 600dpi is taken as an example, and the interval between droplets, i.e., 1/600 inch, is taken as a unit dot pitch. The spray heads have 4 rows in total, and as shown in fig. 4, the distance between the adjacent two rows of spray nozzles is 192 unit point distances. First, M was confirmed to be 4 and N was confirmed to be 48.

If each nozzle is sprayed at three points, the resolution becomes 150dpi, and the paper moving speed can be increased by 4 times. Each row of nozzles is fired simultaneously, and after 48 firings are completed, the paper moves 48 x 4 = 192 unit point distances at the 49 th firing, that is, the position of the paper opposite to the second row of spray holes coincides with the position opposite to the first row of spray holes at the first firing. Thus, ink is ejected for a plurality of times at the same position, and a blank situation appears at the adjacent position. As shown in the upper two schematic diagrams of fig. 9, the paper moves from right to left, the four rows of nozzles fire simultaneously, after a period of time passes from the point where the first row of nozzles is ejected from the left, the second row of nozzles will eject ink at the same point, the positions of the ejected ink overlap, and a gap exists between two ink droplets.

To avoid this phenomenon, the method of the present solution is: after 48 firings are performed at each 4 dot pitches (unit dot pitches), the next firing time is advanced by one fourth to obtain 3 dot pitches (unit dot pitches), so that the ink droplets to be overlapped are staggered by one unit dot pitch. Then, the ignition is performed 48 times according to 4 point pitches (unit point pitches), and then the ignition is performed once according to 3 point pitches (unit point pitches), and the cycle is continued. As shown in fig. 9, in the third graph of fig. 9, if the second row of nozzles fire at intervals corresponding to 4 dot pitches after the second row of nozzles on the left completes 48 ignitions, the ink droplets ejected from the second row of nozzles overlap with the ink droplets ejected from the first row of nozzles, so that in order to avoid overlapping, 3 blank dots exist between every two adjacent ink droplets, the nozzles shorten the interval time corresponding to one unit dot pitch for ignition, and the ink-jet image is replenished by dropping forward on one blank dot; after the ignition is completed 48 times, the ink jet image is offset from each other and is replenished by advancing the 3 dot pitch to ignite 48 times as shown in the fourth graph of fig. 9, and the 150dpi becomes 600dpi. That is, the 4 rows of nozzles are simultaneously ignited every first designated time, each nozzle is ignited to drop one ink drop at most, each ink drop corresponds to one pixel point, the pixels which do not need to be printed do not drop ink drops, 3 pixel points are spaced between every two rows of ink drops, the ignition is carried out for N times, N is 48, and the ignition is carried out for N times as a group; the second specified time of the pause ignition is calculated, and the ratio of the second specified time to the first specified time is M-1: m; printing a group, then stopping printing the next group after a second designated time, and repeating the steps until the interval time between every two groups of components is the second designated time. Since the printing distance is only 3 times longer at the frequency conversion switching (i.e. stopping ignition for the second designated time), and the lowest speed in the whole process is the final speed, the paper moving speed is 3 times longer than the original speed.

According to the scheme, the ignition frequency is not changed, but the moving speed of the paper is increased to 3 times, the high-frequency ink drop density is printed by using the low-frequency ignition frequency, if the number of rows of nozzles is increased, the moving speed of the paper is increased, and the moving speed of the paper is M-1 times that of the row-by-row printing. In addition, since the same row of ink points are alternately sprayed out by four rows of spray holes respectively, if one nozzle is blocked, the phenomenon of figure 3 is not caused by blocking all ink points in a whole row, but only one quarter (1/M) of ink points in a row are blocked, so that the blocked state of the nozzle is greatly improved. As shown in fig. 10, the ink jet effect of fig. 10 is compared with that of fig. 10, the upper part shows the complete ink jet pattern, and the lower part shows the ink jet condition after one nozzle is blocked, and only one quarter of ink dots are not discharged.

The relationship between the inkjet dot and the firing is shown in table 1.

TABLE 1

Analysis of table 1 can give:

(1) The first group was fired 48 times, with the first row of nozzles being fired at 4 unit points from the 3 rd point to the 191 th point; the second group is ignited 48 times, ink is ejected towards the back of the former unit point distance, the first row of nozzles ejects from the position of the 194 th point to the 382 th point every 4 unit point distances, and the second row of nozzles ejects from the position of the 2 nd point to the position of the 190 th point every 4 unit point distances; the third group is ignited 48 times and then ink is ejected to the front unit point distance, the first row of nozzles ejects from the 385 th point to the 573 th point every 4 unit points, the second row of nozzles ejects from the 193 rd point to the 381 th point every 4 unit points, and the third row of nozzles ejects from the 1 st point to the 189 th point every 4 unit points; the fourth group is ignited 48 times and then ink is sprayed to the front unit point, the first row of nozzles sprays from the position of 576 to the position of 764 at intervals of 4 unit points, the second row of nozzles sprays from the position of 384 to the position of 572 at intervals of 4 unit points, the third row of nozzles sprays from the position of 192 to the position of 380 at intervals of 4 unit points, and the fourth row of nozzles sprays from the position of 0 to the position of 188 at intervals of 4 unit points; ....... The former pixel point is supplemented by the next row of nozzles, so that the paper speed is increased by 3 times, and the printing resolution is kept unchanged.

(2) The integral multiple of the firing times 48 is a position switching point, and as long as the first row of spray holes are not sprayed at the time of firing, all positions are sprayed once without repeated ink spraying, so that the whole image is completely sprayed.

(3) The same reason is that, if the distance between two adjacent rows of nozzles is determined to be 8.128mm, the number of ink ejection dots between two adjacent rows of nozzles at 25dpi is: 8.128/25.4 x 25 = 8, the resolution of the present application is an integer multiple of 25, i.e. an integer multiple of 8, the number of drops between two rows of nozzles, where M is equal to 4 and n is equal to 2, and a new print mode can be rearranged in this mode. If the new resolution is multiple dpi of 25, for example, when the new resolution is 600dpi, for example, the new resolution is 24 times of 25dpi, then n=24×2=48, according to the rule that M pixels are printed once, every time the printing of 4×n rows of dots is performed, the printing position is changed once through interval time, the position 4 is changed to the position 3, then the 4×n rows of dots are printed according to the method, then the position 3 is changed to the position 2, then the 4×n rows of dots are printed according to the method, then the position 2 is changed to the position 1, after the position is adjusted, the first pixel of the first row of nozzles is not printed, or the last pixel is not printed before the position is adjusted, the image is perfectly printed, and no missing or repeated dots can be generated.

(4) From the above analysis, the principle of the scheme is to adjust the time interval between every two groups based on the two ink drop intervals to supplement the ink drops in a staggered way, so long as the effects that the interval between two adjacent rows of nozzles is M multiplied by N times of the unit point distance and the distance between the ink drops dropped after every two times of ignition is M times of the unit point distance can be met, the paper moving speed can be increased to approximately M-1 times, and the printing resolution is unchanged can be realized.

The exemplary embodiments of the present application have been particularly shown and described above. It is to be understood that this application is not limited to the precise arrangements, instrumentalities and instrumentalities described herein; on the contrary, the application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (7)

1. A method for rapid printing by an inkjet printer, comprising the steps of:

s1: the paper continuously moves along the length direction of the paper;

arranging M rows of nozzles along the length direction of the paper, wherein the interval between two adjacent rows of nozzles is M multiplied by N times of the unit point distance, and the unit point distance is the distance between two pixel points of a printed finished product; m is a natural number greater than or equal to 2; n is a natural number greater than or equal to 1;

s2: simultaneously igniting M rows of nozzles at intervals of a first designated time, wherein each nozzle is ignited to drop one ink drop at most, each ink drop corresponds to one pixel point, the distance between the ink drops which are ignited and dripped every two times is M times of the unit point distance, and the two ink drops are ignited for N times;

s3: pause the ignition for a second designated time; the ratio of the second specified time to the first specified time is M-1: m;

s4: and repeating the step S2 and the step S3 until printing is completed.

2. The method of rapid printing in an inkjet printer according to claim 1 wherein in step S1, the ink colors of the M rows of nozzles are uniform.

3. The method of rapid printing by an inkjet printer according to claim 1 wherein N is an integer multiple of 2 and the resolution of the paper in the length direction is N x 12.5dpi.

4. The method according to claim 1, wherein in step S2, the pixel points not requiring printing do not drop ink.

5. The method of rapid printing in an inkjet printer according to claim 1 wherein in step S2, the first row of nozzles need not drop ink droplets at the nth firing.

6. A fast printing device, characterized in that a fast printing method according to any one of claims 1-5 is achievable.

7. The rapid printing device of claim 6, comprising an ink tank, a printhead, and a control unit;

the ink tank is connected with the printing head and is used for providing ink;

the printhead includes M rows of nozzles;

the control unit is communicatively coupled to the printhead for controlling the printhead to fire and drop ink onto the paper.