High-speed printing method and high-speed printing apparatus for inkjet printers

Abstract

The present invention relates to the field of inkjet printing technology and provides a high-speed printing method and a high-speed printing apparatus for an inkjet printer. [Solution] The method comprises: step S1, moving the paper continuously along the length of the paper; step S2, in which M rows of nozzles are arranged along the length of the paper, the distance between two adjacent nozzle rows is M × N times the unit dot distance, the unit dot distance is the distance between two pixel dots on the finished print, M is a natural number of 2 or more, and N is a natural number of 1 or more, and the M rows of nozzles are ejected simultaneously at first predetermined time intervals, with a maximum of one ink droplet being dispensed from one nozzle each time ejection, each ink droplet corresponding to one pixel dot, and the distance between the ink droplets dispensed by each two ejections being M times the unit dot distance, for a total of N ejections; step S3, in which ejection is temporarily suspended for a second predetermined time, the ratio of the second predetermined time to the first predetermined time is M-1:M; and step S4, in which steps S2 and S3 are repeated until printing is completed. According to this concept, it is possible to effectively improve printing speed and prevent white lines from appearing and affecting the print quality.

Description

Technical Field

[0001] The present invention relates to the field of inkjet printing technology, and particularly to a high-speed printing method and a high-speed printing apparatus for an inkjet printer.

Background Art

[0002] Printing is a very old technology but is constantly evolving. With the continuous development of printing technology, inkjet-based digital printing systems have become widely popular and are widely recognized in society. Many types of digital printing devices differ in the printing tasks they undertake and the use of different ejection heads, and have different performance parameters and quality indicators.

[0003] Single-pass (also called 1pass or single pass) printing has the ejection heads arranged in a row and held stationary. The paper moves quickly under the ejection heads, and each nozzle of the ejection head ejects ink droplets at a certain frequency, and these ink droplets form a single line on the paper. A large number of aligned nozzles form many such parallel lines on the paper, and these dense lines form a rectangle. As shown in FIG. 1, there are areas with ink and areas without ink within the rectangle, resulting in a printing pattern. When the ink printing density of one line is maintained the same, it is clear that the higher the frequency of ink ejection by the ejection head, the faster the paper movement speed. The printing speed is determined by the firing frequency, that is, the frequency of ink ejection by the ejection head, and the higher the firing frequency, the faster the printing speed. Ejection heads with a high firing frequency are often expensive and difficult to maintain.

[0004] According to conventional technology, as shown in Figure 2, the nozzles are arranged in a single row, and a complete pattern is ejected by independently controlling the ejection time of each nozzle. In conventional technology, the print speed is entirely dependent on the ejection frequency, but there is little room for improvement in the ejection frequency. Furthermore, if one nozzle becomes clogged, white lines appear as shown in Figure 3, the printing effect is impaired, and there is a very high probability that the nozzle will become clogged.

[0005] Therefore, there is a need to provide a high-speed printing method and a high-speed printing device for inkjet printers that can effectively improve printing speed and prevent white lines from appearing and affecting the print quality.

[0006] The information disclosed above is used solely to provide an understanding of the background of this application and may include information that does not constitute prior art known to those skilled in the art. [Overview of the project] [Problems that the invention aims to solve]

[0007] The main objective of the present invention is to provide a high-speed printing method and high-speed printing apparatus for an inkjet printer that overcomes the problem of low print efficiency of inkjet printers, effectively improves print speed, and prevents white lines from appearing and affecting the print quality. [Means for solving the problem]

[0008] To achieve the above objective, a first aspect of the present invention is: Step S1 involves continuously moving the paper along the length of the paper, Step S2 is a step in which M rows of nozzles are arranged along the length of the paper, the distance between two adjacent nozzle rows is M × N times the unit dot distance, the unit dot distance is the distance between two pixel dots on the finished print, M is a natural number greater than or equal to 2, and N is a natural number greater than or equal to 1, wherein at first predetermined time intervals, the M rows of nozzles are ejected simultaneously, with a maximum of one ink droplet being released from one nozzle each time ejection, each ink droplet corresponding to one pixel dot, and the distance between the ink droplets released by each two ejections is M times the unit dot distance, and a total of N ejections are performed. Step S3 is a step in which injection is temporarily suspended for a second predetermined time, wherein the ratio of the second predetermined time to the first predetermined time is M-1:M. Step S4 repeats steps S2 and S3 until printing is complete. This invention provides a high-speed printing method for inkjet printers equipped with the necessary components.

[0009] According to an exemplary embodiment of the present invention, in step S1, the ink colors from the M-row nozzles are the same.

[0010] According to an exemplary embodiment of the present invention, N is an integer multiple of 2, and the resolution in the length direction of the paper is N × 12.5 dpi.

[0011] According to one exemplary embodiment of the present invention, the number of nozzles in each row is 800 or more, and the distance between nozzles in each row in the width direction of the paper is one unit dot distance.

[0012] According to one exemplary embodiment of the present invention, each nozzle row includes two offset rows of nozzles, and the number of nozzles in each row is 400 or more.

[0013] According to one exemplary embodiment of the present invention, two adjacent nozzles in each nozzle row are separated by a distance of two unit dots.

[0014] Preferably, M is 4, N is 48, and the unit dot distance is 1 / 600 inch.

[0015] According to an exemplary embodiment of the present invention, in step S2, ink droplets are not applied to pixel dots that do not need to be printed.

[0016] According to an exemplary embodiment of the present invention, in step S2, the first row of nozzles does not need to dispense ink droplets during the Nth injection.

[0017] A second aspect of the present invention provides a high-speed printing apparatus capable of realizing the high-speed printing method described above.

[0018] According to an exemplary embodiment of the present invention, the high-speed printing apparatus comprises an ink tank, a print head, and a control unit. The aforementioned ink tank is connected to the print head and configured to supply ink. The print head includes an M-row nozzle, The control unit is configured to communicate with the print head and to control the ejection of ink from the print head and the dropping of ink droplets onto the paper. [Effects of the Invention]

[0019] The advantages and effects of this invention are that, according to this concept, an M-row nozzle is provided, the injection interval time is adjusted every N injections, high-frequency effects are output at low-frequency injection frequencies, nozzle costs are reduced, defects due to clogged ejection holes are reduced, and the print speed is increased by M-1 times. [Brief explanation of the drawing]

[0020] The above and other purposes, features, and advantages of this application will become clearer by describing in detail the exemplary embodiments with reference to the attached drawings. The drawings described below are merely examples of some embodiments of this application, and those skilled in the art can derive other drawings from these without any creative effort.

[0021] [Figure 1] Schematically shows the printing effect diagram by a single pass. [Figure 2] Schematically shows the printing effect diagram when the nozzles are arranged in a single row. [Figure 3] Schematically shows the printing effect diagram when the nozzles are arranged in a single row and the discharge holes are clogged. [Figure 4] Schematically shows a schematic diagram of the nozzles in M rows of the print head. [Figure 5] Schematically shows the configuration diagram of the print head (excluding the ink passage). [Figure 6] Schematically shows the configuration diagram of the print head (including the ink passage). [Figure 7] Schematically shows the flowchart of the high-speed printing method of the inkjet printer. [Figure 8] Schematically shows a schematic diagram of printing by a plurality of color discharge heads. [Figure 9] Schematically shows a schematic diagram of printing by the high-speed printing method of the inkjet printer. [Figure 10] Schematically shows a comparison diagram of the ink ejection effect.

Embodiments for Carrying Out the Invention

[0022] Exemplary embodiments will be further described more comprehensively while referring to the accompanying drawings. It should be noted that the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that this application becomes comprehensive and complete, and the idea of the exemplary embodiments can be sufficiently conveyed to those skilled in the art. In the drawings, the same reference numerals indicate the same or similar parts, and thus their repetitive descriptions are omitted.

[0023] Furthermore, the described features, structures, or properties can be combined in one or more embodiments in any suitable manner. The following description provides some specific details to fully understand the embodiments of this application. Those skilled in the art will notice that the technical concept of this application can be implemented without one or more of the specific details, or that other methods, components, apparatus, steps, etc., can be employed. In other cases, well-known methods, apparatus, implementations, or operations are not shown or described in detail so as not to obscure the embodiments of this application.

[0024] The block diagrams shown in the drawings represent only functional entities and do not necessarily have to correspond to physically independent entities. That is, these functional entities can be implemented in software form, or on one or more hardware modules or integrated circuits, or on different networks and / or processor devices and / or microcontroller devices.

[0025] The flowcharts shown in the diagrams are for illustrative purposes only and do not need to include all content and operations / procedures, nor do they need to be performed in the order they are shown. For example, some operations / procedures can be broken down, and others can be combined or partially combined, so the actual order in which they are performed may vary depending on the actual situation.

[0026] Here, we may use terms such as first, second, third, etc., to describe various components, but it should be understood that these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component described below can be called the second component without departing from the implications of the concept of this application. As used herein, the term "and / or" includes all combinations of any one or more of the listed items in question.

[0027] Those skilled in the art will understand that the drawings are merely schematic diagrams of exemplary embodiments, and that the modules or processes depicted in the drawings are not necessarily required for the implementation of this application and therefore do not limit the scope of protection of this application.

[0028] According to a first specific embodiment of the present invention, the present invention provides a high-speed printing apparatus comprising an ink tank, a print head, and a control unit.

[0029] The ink tank is connected to the print head and is configured to supply ink.

[0030] The printhead includes M-row nozzles and M ink passages.

[0031] The control unit is configured to communicate with the print head and control the ejection of ink from the print head and the dropping of ink droplets onto the paper.

[0032] As shown in Figures 4, 5, and 6, the M rows of nozzles are located at the bottom of the print head and are configured to eject ink onto the paper below the print head. Each adjacent row of nozzles is spaced a predetermined distance apart, which is N × M unit dot distances. A unit dot distance is the distance between two pixel dots on the finished print. Each row has 800 or more nozzles, and the distance between nozzles in each row in the width direction of the paper is one unit dot distance. Each nozzle row contains two columns of nozzles that are offset from each other, with each column having 400 or more nozzles. Two adjacent nozzles in each nozzle column are separated by two unit dot distances. Due to the offset arrangement, the actual print effect is the same as if each row had multiple nozzles, with each pair of nozzles separated by one unit dot distance, and it is considered that each row has 800 or more nozzles.

[0033] Specifically, M is 4, with two adjacent nozzle rows spaced 8.128 mm apart (i.e., the distance of 192 pixel dots, i.e., 192 / 600 inches), two adjacent nozzle rows spaced 1.016 mm apart (i.e., the distance of 24 pixel dots), two adjacent nozzles in each nozzle row spaced 0.085 mm apart (i.e., the distance of 2 pixel dots), each row has 400 nozzles, and adjacent nozzles with the same number in two rows are spaced 0.042 mm across the width of the paper (i.e., the distance of 1 pixel dot). In Figure 4, there are a total of 8 rows of nozzles, which are arranged from right to left as shown in Figure 5: rows A, B, C, D, E, F, G, and H, respectively, and the offset of two adjacent rows improves the resolution of ink ejection. As shown in Figure 6, there are four ink passages, and from right to left, the first connects columns B and G, the second connects columns A and H, the third connects columns C and F, and the fourth connects columns D and E. Since the ink colors of the four ink passages are the same, the ink color from the nozzles in row M is the same. The reason why two non-adjacent columns are connected by ink passages is to eliminate the effects of static electricity.

[0034] The control unit instructs the print head to simultaneously eject M rows of nozzles at first predetermined time intervals. With each ejection, a maximum of one ink droplet is released from each nozzle, each ink droplet corresponding to one pixel dot. The distance between ink droplets in each pair of rows is M-1 pixel dots. In other words, the distance between ink droplets released by each pair of ejections is M times the unit dot distance, resulting in a total of N ejections, which constitute one group. A second predetermined time pause occurs between each group of ejections, and the ejection of multiple groups is repeated until printing is complete. The ratio of the second predetermined time to the first predetermined time is M-1:M.

[0035] According to a second specific embodiment of the present invention, the present invention provides a high-speed printing method for an inkjet printer using the high-speed printing apparatus of the first specific embodiment, and includes the following steps S1 to S4 as shown in Figure 7.

[0036] In S1, the paper is moved continuously along its length.

[0037] As the paper is moved by the digital printing press, the encoder in the press changes position along with the paper. The control board determines the current position of the paper and whether or not to eject it, according to the scale on the encoder. Using the method of the present invention, the paper movement speed can be increased by (M-1) times. Assuming that the ink ejection resolution along the length of the paper is 600 dpi, the ejection frequency of the ejection head is 21 kHz, and there are four ink passages, the maximum paper movement speed with a conventional dot inkjet method is 21000 / 600 × 25.4 = 889 mm / s, totaling 53.3 meters / minute. However, when printing using the method of the present invention, the speed can be increased three times, or to 160 meters / minute.

[0038] The M rows of nozzles are arranged along the length of the paper, and the distance between two adjacent nozzle rows is M × N times the unit dot distance, where the unit dot distance is the distance between two pixel dots on the finished print. M is a natural number greater than or equal to 2, and N is a natural number greater than or equal to 1.

[0039] Each adjacent row of nozzles is spaced a predetermined distance apart, which is the distance between N × M unit dots. Each nozzle row contains two columns of nozzles that are offset from each other, and each column has 400 or more nozzles.

[0040] The ink color from the M-row nozzles is identical.

[0041] Preferably, M is 4, N is 48, and the unit dot distance is 1 / 600 inch.

[0042] In S2, M rows of nozzles are simultaneously ejected at first predetermined time intervals, with a maximum of one ink droplet being dispensed from each nozzle during each ejection. Each ink droplet corresponds to one pixel dot, and a total of N ejections are performed such that the distance between the ink droplets dispensed by each two ejections is M times the unit dot distance.

[0043] Ink droplets are not applied to pixel dots that do not need to be printed.

[0044] The number of ejections is determined based on the unit dot distance, the distance between two nozzle rows, and the number of nozzle rows. N is an integer multiple of 2, the resolution in the length direction of the paper is N × 12.5 dpi, and the unit dot distance is 1 / (N × 12.5) inches.

[0045] Since the contents of the ink ejected from the first nozzle overlap with those of subsequent nozzles during the Nth ejection, it is preferable that the first nozzle does not need to dispense ink droplets during the Nth ejection in order to reduce the repetition of ink ejection.

[0046] In S3, injection is temporarily suspended for a second predetermined time, and the ratio of the second predetermined time to the first predetermined time is M-1:M.

[0047] In S4, steps S2 and S3 are repeated until printing is complete.

[0048] Repeat steps S2 and S3 a total of M times.

[0049] The advantages of high-speed printing methods for inkjet printers will be explained below using detailed examples.

[0050] Figure 8 shows a schematic diagram of printing using a multi-color ejection head. A multi-color ejection head has multiple rows of ejection holes distributed in parallel. In conventional methods, each row of ejection holes ejects a different color of ink, usually the four CMYK inks. In Figure 8, from left to right, these are the four CMYK colors. As the paper moves, the four ink droplets are ejected at the same position, and different combinations of inks produce multiple colors, resulting in color printing.

[0051] According to the method of the present invention, the same color is ejected from multiple color ejection holes, the ink dots are offset so that the ink is not printed in the same position, the four types of ejection holes each print different lines, intersecting and complementing each other, and different nozzles form a complete image without printing on the same pixel dot. As mentioned above, each nozzle row includes two columns offset from each other (as shown in Figures 4 and 5), which are close to each other to improve lateral resolution, and for convenience of explanation, there are again a total of four rows.

[0052] As shown in Figure 9, for the EPSON i3200 ejection head, we will explain using 600 dpi as an example, and define the ink droplet interval, i.e., 1 / 600 inch, as the unit dot distance. The ejection head has a total of 4 rows, and as shown in Figure 4, the distance between two adjacent nozzle rows is 192 unit dot distances. First, we confirm that M is 4 and N is 48.

[0053] If each nozzle ejects every 3 dots, the resolution becomes 150 dpi, but the paper movement speed is increased to four times the original speed. The nozzles in each row eject simultaneously, and after 48 ejections are completed, at the 49th ejection, the paper has moved by 48 * 4 = 192 unit dots. In other words, the position of the paper where the nozzles of the second row face overlaps with the position where the nozzles of the first row faced during the first ejection. As a result, multiple ink ejections occur at the same location, but there are gaps in adjacent locations. As shown in the two schematic diagrams at the top of Figure 9, the paper moves from right to left, and the four rows of nozzles eject simultaneously. After a certain amount of time has elapsed since the nozzles of the first row ejected ink from the left, the nozzles of the second row eject ink at the same location, so the ejected ink positions overlap, and there is a gap between the two ink droplets.

[0054] To avoid this phenomenon, in this method, after 48 ejections at a dot pitch (unit dot distance) of 4 dots, the time interval for the next ejection is shortened by 1 / 4, to 3 dots (unit dot distance), thereby shifting the ink droplets that would normally overlap by 1 unit dot distance. Next, 48 ejections are performed at a dot pitch (unit dot distance), followed by one ejection at a dot pitch (unit dot distance). The cycle continues in this manner. As shown in Figure 9, in the third diagram of Figure 9, if the nozzle in the second row from the left ejects again at a time interval corresponding to 4 dots pitch after completing 48 ejections, the ink droplet ejected from the nozzle in the second row will overlap with the ink droplet ejected from the nozzle in the first row. To avoid this overlap, since there are 3 blank points between each pair of adjacent ink droplets, if the nozzle ejects at a time interval shortened by the time corresponding to 1 unit dot distance, it will drop ink into the blank point in front to complement the image of the ejected ink. After 48 ejections are completed, the process is accelerated to a dot pitch of 3 and another 48 ejections are performed. As shown in the fourth figure of Figure 9, the ejected ink images are offset from each other and complement each other, resulting in a resolution of 150 dpi to 600 dpi. In other words, four rows of nozzles are ejected simultaneously at first predetermined time intervals, with a maximum of one ink droplet being dispensed from each nozzle during each ejection. Each ink droplet corresponds to one pixel dot, and no ink is dispensed to pixel dots that do not need to be printed. There is a gap of only three pixel dots between each pair of ink droplets, resulting in a total of N ejections, where N is 48, and N ejections constitute one group. Ejection is paused for a second predetermined time, with the ratio of the second predetermined time to the first predetermined time being M-1:M. After one group of prints is completed, there is a pause for the second predetermined time before the next group of prints is performed. The interval between each pair of groups is the second predetermined time. The cycle continues in this manner. When switching between the two groups during ejection (i.e., after pausing ejection for a second predetermined time), the print distance is tripled, but the paper movement speed is increased to three times the original speed because the slowest speed in the entire process is considered the final speed.

[0055] This invention shows that while the ejection frequency does not change, the paper movement speed increases, and the paper movement speed increases by three times. According to this invention, high-frequency ink droplet density can be printed at a low-frequency ejection frequency. The more rows of nozzles there are, the faster the paper movement speed becomes, and the paper movement speed is M-1 times that of printing row by row. In addition, in this invention, since the ink dots in the same column are ejected alternately from four rows of ejection holes, if one nozzle becomes clogged, the entire column of ink dots does not become clogged and the phenomenon shown in Figure 3 does not occur. Instead, only one-quarter (1 / M) of the ink dots in one column become clogged, which significantly improves the nozzle clogging situation. As shown in Figure 10, Figure 10 is a comparison diagram of the ink ejection effect, showing the complete pattern of ejected ink at the top and the ink ejection situation after one nozzle becomes clogged at the bottom, where only one-quarter of the ink dots do not come out.

[0056] The relationship between the ink ejection dot position and ejection is shown in Tables 1 to 5.

[0057] [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] [Table 6] [Table 7] [Table 8] [Table 9]

[0058] Analyzing Tables 1 to 9 yields the following results.

[0059] (1) In the first group, 48 injections are performed, with the first row of nozzles ejecting ink at intervals of four unit dots from the position of the third dot to the position of the 191st dot. In the second group, 48 injections are performed, with the ink ejected one unit dot distance ahead, with the first row of nozzles ejecting ink at intervals of four unit dots from the position of the 194th dot to the position of the 382nd dot, and the second row of nozzles ejecting ink at intervals of four unit dots from the position of the second dot to the position of the 190th dot. In the third group, 48 injections are performed, with the ink ejected one unit dot distance ahead, with the first row of nozzles ejecting ink at intervals of four unit dots from the position of the 385th dot to the position of the 573rd dot, the second row of nozzles ejecting ink at intervals of four unit dots from the position of the 193rd dot to the position of the 381st dot, and the third row of nozzles ejecting ink at intervals of four unit dots from the position of the first dot to the position of the 189th dot. In the fourth group, 48 ejections are performed, with the ink ejected one unit dot distance ahead. The first row of nozzles ejects ink from the 576th dot to the 764th dot at intervals of four unit dots, the second row of nozzles ejects ink from the 384th dot to the 572nd dot at intervals of four unit dots, the third row of nozzles ejects ink from the 192nd dot to the 380th dot at intervals of four unit dots, and the fourth row of nozzles ejects ink from the 0th dot to the 188th dot at intervals of four unit dots. ... By interpolating the previous pixel dot position with subsequent nozzle rows in this way, the paper speed is tripled while the print resolution remains the same.

[0060] (2) The number of ejections that is an integer multiple of 48 is a position switching point, and unless the ink is ejected from the ejection hole of the first row at that ejection, the ink will not be ejected repeatedly, but will be ejected once at all positions, and the entire image will be ejected completely.

[0061] (3) For the same reason, if the pitch between two adjacent nozzle rows is determined to be 8.128 mm, then the number of ink ejection dots between two adjacent nozzle rows is 8.128 / 25.4*25=8 at 25 dpi, and the resolution corresponding to the present invention is an integer multiple of 25, and the number of ink droplets between two nozzle rows is also an integer multiple of 8. Here M is equal to 4 and N is equal to 2. In other words, a new print mode can be rearranged according to this mode. If the new resolution is a multiple of 25 dpi, for example, if it is 600 dpi which is 24 times 25 dpi, then N=24*2=48, and according to the rule of printing once for every M pixels, N prints are made, and each time 4 x N rows of dots are printed, the print position changes by the interval time, position 4 is changed to position 3, and then 4 x N rows of dots are printed according to the above method and position 3 is changed to position 2, and then 4 x N rows of dots are printed according to the above method and position 2 is changed to position 1. If the first pixel is not printed by the first nozzle after position adjustment, or if the last pixel is not printed before position adjustment, the image will be printed perfectly with no omissions or duplicate dots.

[0062] (4) As can be seen from the above analysis, the principle of this idea is to adjust the time interval between each of the two groups based on the distance between two ink droplets to shift and complement the position of the ink droplets. If the distance between two adjacent nozzle rows is M × N times the unit dot distance, and the distance between ink droplets dispensed by each of the two ejections is M times the unit dot distance, then it is possible to increase the paper movement speed by approximately M-1 times without changing the print resolution.

[0063] Exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structures, arrangements, or methods of implementation described herein. Rather, the present invention is intended to encompass various variations and equivalent arrangements that fall within the spirit and scope of the appended claims.

Claims

1. Step S1 involves continuously moving the paper along the length of the paper, The nozzles in row M are arranged along the length of the paper, the distance between two adjacent nozzle rows is M × N times the unit dot distance, the unit dot distance is the distance between two pixel dots on the finished print, M is a natural number greater than or equal to 2, N is an integer multiple of 2, the ink color from the nozzles in row M is the same, and the length of each nozzle row is perpendicular to the direction of paper movement in step S1, Step S2 involves simultaneously ejecting M rows of nozzles at predetermined intervals, with each ejection releasing a maximum of one ink droplet from a single nozzle, each ink droplet corresponding to one pixel dot, and performing a total of N ejections such that the distance between ink droplets released by each two ejections is M times the unit dot distance. Step S3 is to temporarily suspend injection for a second predetermined time, wherein the ratio of the second predetermined time to the first predetermined time is M-1:M. Step S4 repeats steps S2 and S3 until printing is complete, A high-speed printing method for an inkjet printer, characterized by comprising the following features.

2. A high-speed printing method for an inkjet printer according to claim 1, characterized in that the resolution in the length direction of the paper is N × 12.5 dpi.

3. The high-speed printing method for an inkjet printer according to claim 1, characterized in that, in step S2, no ink droplets are dropped onto pixel dots that do not need to be printed.

4. The high-speed printing method for an inkjet printer according to claim 1, characterized in that in step S2, the first row of nozzles does not need to dispense ink droplets during the Nth ejection.

5. A high-speed printing apparatus characterized by being able to realize the high-speed printing method described in any one of claims 1 to 4.

6. It comprises an ink tank, a print head, and a control unit. The aforementioned ink tank is connected to the print head and configured to supply ink. The print head includes an M-row nozzle, The high-speed printing apparatus according to claim 5, characterized in that the control unit is communicatively connected to the print head and configured to control the ejection from the print head and the dropping of ink droplets onto the paper.

Images