KR20110061265A - Inkjet printer equipped with nozzle-relieve-device and method for relieving blockage of nozzle using the same - Google Patents

Abstract

PURPOSE: An inkjet printer with a nozzle-blocking-solving device and a method for solving the blocking of a nozzle using the same are provided to enhance the efficiency by reducing the consumption of ink since if a particular color is not printed, a printing nozzle is moved to an ink cleaning unit and then the blocking problem of the printing nozzle can be solved. CONSTITUTION: An inkjet printer with a nozzle-blocking-solving device comprises a stage(1), a head support(5), a print head unit(7), a vision camera and a print controller. A target(3) is fixed to the top of the stage. The head support is movably installed on the stage. The print head unit is movably installed on the head support. The print head unit comprises a plurality of printing nozzles(8) to perform printing operation on the target. The vision camera is installed on the print head unit. Ink is sprayed from the printing nozzles and thus the vision camera takes images of printed things on the target. The print controller determines using the image information taken by the vision camera whether a particular color has been printed. The print control unit outputs a control signal to solve the blocking of the printing nozzle.

Description

Inkjet printer with nozzle-relieve-device and method for relieving blockage of nozzle using the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a large size inkjet printer device used for industrial purposes and the like, and relates to an apparatus and a method for coping with a nozzle clogging for ejecting ink.

Inkjet printers can be classified into small and medium sized printers and large sized printers according to their sizes. Small and medium sized printers are usually used for home, office, etc., and large sized printers are mainly used for industrial purposes.

Among them, the large printer has a roll providing method and a flat fixing method according to a method of supplying a printing object. It is configured to perform printing on the printing surface of the print object while moving.

The large-size inkjet printer of the plane fixing method is comprised so that a large sized printed matter may be produced for a large advertising board, a banner, etc. The printer can print various materials such as general papers, sheet-like structures such as vinyl, PVC, and silk, and plate-like structures such as wood, glass, stone, and metal.

1 is a schematic perspective view showing an example of a conventional planar fixed inkjet printer, in which the head support 5 and the head support 5 are fixed in a state where the printing object 3 is fixed to an upper side of the stage 1. It is made to print while moving the provided print head unit (7).

The print head unit 7 is provided with a plurality of print nozzles 8 for ejecting ink. Each print nozzle 8 is configured to eject ink of one color, and each print nozzle is C (Cyan: blue), M (Magenta: red), Y (Yellow: yellow), and K (black: It is generally configured to be able to eject ink of black color.

In the printing direction, the print nozzles 8 perform printing of a desired image by selectively spraying ink onto a print object when the print head unit 7 moves while being arranged in parallel in parallel.

If the print nozzle 8 of a specific color is not used for a long time among the plurality of print nozzles, ink is not output from the print nozzles, which causes a problem that the ink at the end of the nozzle dries and clogs.

In order to solve such a problem, the nozzle cleaning part 9 is provided on one side of the head support 5 or the stage 1 (in the drawing, which is illustrated in the head support), and the print head unit is periodically replaced by the nozzle cleaning part 9. After moving to the side, the clogging problem of the printing nozzle 8 is solved by forcibly outputting the ink of all colors from all the printing nozzles 8.

However, when the print nozzle 8 is moved to the nozzle cleaning unit 9 as described above, if the print nozzle is prevented from being clogged by a method of forcibly outputting ink, the print head unit 8 may be opened even when the nozzle is not blocked. Since the ink must be moved to the nozzle cleaning unit 9 and the printing nozzle which is not clogged is forcibly outputted, it takes considerable time to prevent the clogging of the printing nozzle, and the ink consumption is also increased, resulting in low efficiency and economic efficiency of the printer. do.

The contents of the background art described above are technical information that the inventor of the present application holds for the derivation of the present invention or acquired in the derivation process of the present invention and is a known technology disclosed to the general public prior to the filing of the present invention I can not.

The present invention has been made to solve the above problems, the ink is ejected from each print nozzle to detect the printing state, when the specific color is not printed, the clogged print nozzle after moving the print nozzle to the ink cleaning unit An inkjet printer equipped with a nozzle clogging device and a method for solving the problem of nozzle clogging by minimizing the time required to solve the nozzle clogging problem, reducing the ink consumption, and improving the efficiency and economic efficiency of the printer. It is an object of the present invention to provide a method for removing nozzle clogging.

An inkjet printer equipped with a nozzle clogging device according to the present invention for realizing the above object comprises: a stage on which an object to be printed is fixed; A head support mounted on the stage to be movable in the Y axis direction; A print head unit installed on the head support so as to be movable in the X-axis direction and having a plurality of print nozzles to perform a print job on the print object; A vision camera provided in the print head unit and photographing a state in which ink is ejected from the print nozzle and printed on a printing object; And a print control unit for determining whether to print a specific color by using the photographing information of the vision camera and outputting a control signal for eliminating the clogging of a printing nozzle for ejecting ink of the color.

The object to be printed may be divided into a print area for printing an image to be printed by a user and a non-print area for printing to determine whether a print nozzle is blocked outside the print area.

In contrast, the object to be printed is a portion for printing an image to be printed by the user, it is also possible to be separately formed clogging judgment printed on the stage to be arranged in parallel with the object to be printed to determine whether the print nozzle is blocked. .

The print control unit prints lines for each color while spraying all of the ink onto the non-printing area in which the print nozzles of the print head unit are located in parallel with the non-printed area or the print object that is an area outside the image print area on the print object. It is preferred that it is configured to be controllable to be printed.

The print control unit may receive at least one of a reading unit that receives information photographed by the vision camera and determines whether to print a specific color, and at least one of the printing nozzles when a specific color is not printed according to a signal of the reading unit. It is preferable to include a clogging control unit for determining that the normal printing operation is carried out after moving the print nozzle to a specific position to eliminate the clogging of the print nozzle.

The blockage canceling control unit is clogged by forcibly ejecting ink from a print nozzle or a print nozzle including the print nozzle after the print head unit is moved to a head groove provided in an outer region of the stage, and then spraying unprinted colors. It is desirable to be configured to be able to control such that it is eliminated.

Next, the nozzle clogging method of the inkjet printer according to the present invention for realizing the above-described problem, the image printing area and the non-printing area in which the image is not printed on the printing object to be printed, the image of the print area A first step in which the printing of the non-printed area is also performed; A second step of determining whether a specific color is not printed by photographing a printing state of the non-printed area performed in the first step; A third step of eliminating the blockage of the print nozzle after moving the print head unit equipped with the print nozzles to the outer region of the print object when a specific color is not printed in the second step; After the third step, it characterized in that it comprises a fourth step of moving the print head unit toward the position where the print object is located to print again.

In the first step, the printing in the non-printing area is preferably printed so that the color-specific printing lines can be formed by ejecting ink from all the printing nozzles.

In the first step, when the print head unit performs one pass printing for printing while moving from one side to the other side of the object to be printed, it is preferable to continuously proceed with the same path printing to the non-printed area.

In addition, the method of eliminating the nozzle clogging of the inkjet printer according to the present invention for realizing the above-mentioned problem, the clogging decision to print to determine whether the object to be printed and the print nozzle is clogged A first step of arranging a printed matter in parallel with the print object and simultaneously printing the clogged decision printout when the image is printed on the print object; A second step of determining whether a specific color is not printed by photographing a printing state of the clogging judgment printed in the first step; A third step of eliminating the clogging of the print nozzle after moving the print head unit equipped with the print nozzles to the outer region of the object to be printed and the blockage judgment print when the specific color is not printed in the second step; After the third step, it is also possible to include a fourth step of moving the print head unit toward the position where the print object and the blockage-printed printout are located and then printing again.

In the first step, when the print head unit performs one pass printing for printing while moving from one side to the other side of the object to be printed, it is preferable to arrange the clogging judgment printed matter so that the same pass printing proceeds continuously to the clogging decision printing.

In the second step of the two methods, it is preferable to determine whether or not a specific color is printed when a printing line of a specific color does not appear or when the printing line for each color is broken.

In the third step of the above two methods, the method of eliminating the clogging of the printing nozzles is preferably performed by forcibly outputting the ink of the printing nozzles for ejecting ink of a specific non-printed color.

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

An inkjet printer equipped with a nozzle clogging device according to the present invention and a nozzle clogging method using the same, by detecting the state in which the ink is ejected from each printing nozzle, the print nozzle to the head groove when a specific color is not printed Since it is configured to solve the clogging problem of the printing nozzle after moving, it has the effect of minimizing the time required to solve the nozzle clogging problem, reducing the ink consumption, thereby improving the efficiency and economic efficiency of the printer.

In addition, the present invention is also performed to print the image to check the nozzle clogging state at the same time with the image printing, it is possible to quickly determine and cope with the injection state of the specific ink has the effect of increasing the efficiency of the printer.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a schematic perspective view showing an inkjet printer capable of realizing a nozzle clogging method according to an embodiment of the present invention, and FIG. 3 is a plan view of the inkjet printer shown in FIG. 4 is a block diagram showing an apparatus for releasing nozzle clogging of an inkjet printer according to the present invention. On the other hand, Figure 5 is a reference diagram showing a normal printing in the present invention, Figure 6 is a reference diagram showing a state when a particular nozzle clogging in the present invention.

As illustrated in these drawings, the inkjet printer according to the present invention includes a stage 10 on which a print object 15 can be fixed, and a movement in the Y-axis direction on the stage 10. A head support 20 and a print head unit 30 provided on the head support 20 so as to be movable in the X-axis direction and provided with a print nozzle 31 to perform a printing operation on the print object 15. It is composed.

In particular, in the present invention, a vision camera 40 for photographing a state in which ink is ejected from the print nozzle 31 provided in the print head unit 30 to be printed on the print object 15 is provided. The print control unit 50 may determine whether a specific color is being printed by using the photographing information of the vision camera 40, and output a control signal to solve a clogging problem of the printing nozzle 31 that ejects ink of the color. ) Is further provided.

The main components of the inkjet printer according to the present invention configured as described above will be described in detail.

First, as shown in FIG. 2, the stage 10 may be formed to have a rectangular plane as a whole so that the print object 15 may be placed on the upper surface, and may fix the position by absorbing the print object 15. It is desirable to have a suction function so as to form a negative pressure.

Moreover, it is preferable that the stage 10 has the Y-axis guide 12 which guides the movement of the said head support 20 to the Y-axis direction.

Next, the head support 20 is coupled to both sides of the stage 10 is configured to be linearly moved in the Y-axis direction, it is formed as a gantry structure as a whole. That is, the head support 20 is connected to the both side support 21, which is movably coupled to the Y-axis guide 12 formed on both sides of the stage 10, and connects the upper portion of the both support 21 to the print head unit It consists of a horizontal support 23 for supporting 30 to be moved in the X-axis direction.

Here, the both side support 21 or the stage 10 is provided with a drive unit to move the head support 20 in the Y-axis direction with respect to the stage.

The horizontal support 23 is provided with a linear motion (LM) guide to move the print head unit 30 in the X-axis direction, the LM guide can be appropriately configured using a known configuration so that the detailed description Omit. In Fig. 2, reference numeral 27 denotes an X-axis guide.

In FIG. 2, reference numeral 25 denotes a head groove portion provided on both support members 21 to remove the clogging state of the print nozzles 31 or to clean the nozzles while the print head unit 30 is moved. The head groove 25 may be configured in various ways by referring to a known configuration that can eliminate nozzle clogging or clean the nozzle according to the implementation conditions. The head groove 25 in this embodiment is configured to solve the problem of clogging the nozzle by forcibly ejecting ink to all the print nozzles 31 or only a specific print nozzle while the print head unit 30 is moved upward. An example is illustrated.

To this end, the head groove portion 25 may be installed on at least one of the both side support 21 of the head support 20, which is a position outside the stage 10, the ink in the state that the print head unit 30 is moved When forcibly outputted, the ink discharge plate 26 is provided so that the ink does not fall to the bottom of the printer installation space and can be collected and discharged.

The ink discharge plate 26 is formed with a plurality of holes through which a plurality of ink can be discharged, and both sides of the support 21 on which the ink discharge plate 26 is installed are provided with a box portion for collecting the forced jetted ink ( 27) is preferably provided.

The head groove 25 is not limited to the configuration illustrated in the drawings, and may be variously adopted and configured as long as it is capable of eliminating blockage of the printing nozzle 31 by forcibly ejecting ink as described above. For example, a physical device (auger shape or the like) for drilling the injection hole of the printing nozzle 31 in the head groove portion 25 may be installed, or the end of the printing nozzle may be cleaned by spraying a high-pressure cleaning liquid. It is also possible to check, repair or replace the print nozzle to eliminate clogging.

When the ink is forcibly output and the blockage is eliminated, the ink is forcibly ejected at a pressure higher than the pressure at which the ink is ejected from the printing nozzle 31 when printing, and the nozzle is clogged because the ink dries. Is preferably configured to solve the problem of clogging the nozzle hole.

Next, the print head unit 30 includes a head support portion 33 which is moved in the X-axis direction in a state of being supported by the horizontal support 23 of the head support 20, and in front of the head support part 33. It can be composed of a head body 35, the print nozzle 31 is mounted to perform a print job on the print object 15 fixed to the upper portion of the stage (10).

The head body 35 is provided with a plurality of print nozzles 31, the print nozzles 31 are four colors, C (Cyan: blue), M (Magenta: red), Y (Yellow: yellow), It is common to arrange | position and arrange so that ink, such as K (black: black), may be ejected.

In the embodiments of the present invention to be described below, the conditions provided with four print nozzles respectively outputting the four colors will be described. This is one example, and of course, it is applicable to the case of four or less or four or more printing nozzles.

Next, the main component part which comprises a nozzle clogging removal apparatus is demonstrated.

2 and 3, the print object 15 includes a print area 15a for printing an image to be printed by a user, and to determine whether a print nozzle is blocked outside the print area 15a. It is preferable to divide into the non-printing area 15b to print.

At this time, the print control unit 50, the print nozzles 31 of the print head unit 30 are all in the non-printing area (15b) that is the area outside the image print area (15a) in the print object (15). It is configured to control the printing line 15c for each color to be printed while jetting ink. Of course, the print control unit 50 is typically provided with control means for outputting all control signals, including image print signals, when printing a printer.

4, the print control unit 50 receives information captured by the vision camera 40 to determine whether to print a specific color, and a read signal of the read unit 51. If one of the print nozzles 31 is clogged when a particular color is not printed, the print head unit 30 is moved to the head groove 25 which is the nozzle cleaning area, thereby clogging the print nozzles 31. It is preferable to comprise the blockage control part 53 which controls so that a normal printing operation may be performed after eliminating.

Here, the clogging control unit 53 is forcibly ejected ink from the printing nozzle 31 for ejecting the unprinted color after moving the print head unit 30 to the nozzle cleaning area, the ink of the printing nozzle 31 It is preferable to control so that the blockage can be eliminated, and alternatively, it is also possible to control to eliminate the blockage by forcibly ejecting the ink of all the printing nozzles 31.

The blockage canceling control unit 53 stops printing, signals for moving the print head unit 30 to the head groove 25, and forcibly ejecting ink when the print head unit 30 moves to the head groove 25. Signal, a signal for moving the print head unit 30 to the position where the printing was interrupted or the initial printing position in the state where the clogging of the specific printing nozzle 31 is eliminated, a signal for ejecting ink to start printing again, and the like. It is configured to. Of course, the mixing cancellation control unit 53 should typically be configured to output a signal in cooperation with control means for outputting all control signals of the printer.

The print control unit 50 including the blockage elimination control unit 53 is configured to output a signal to a print head unit drive unit, each print nozzle ink injection drive unit and the like as a normal print control unit.

The nozzle clogging method using the inkjet printer according to the present invention as described above will be described. It will be described focusing on the nozzle clogging method of an embodiment according to the present invention.

First, the image printing area 15a and the non-printing area 15b where an image is not printed are separated and printed on the printing object 15. At this time, when the image of the print area 15a is printed, the printing of the non-print area 15b also proceeds.

At this time, printing in the non-printing area 15b is performed so that ink can be ejected from all the printing nozzles 31 so that a color-specific printing line 15c can be formed. Color-specific printing is to print blue, red, yellow, and black print lines 15c, respectively, when the print nozzles 31 output ink of C, M, Y, and K colors. In the drawing of the embodiment, four printed lines show the state in which four colors are printed.

The reason for printing with each print line 15c is to easily check the ink output state of all colors using the vision camera 40. That is, when the printing line 15c of a specific color is broken (“A” portion of FIG. 6) or when the printing line of a specific color is not printed at all, it can be easily confirmed through the vision camera 40. .

The printing of the non-printing area 15b is preferably performed continuously when the print head unit 30 moves while printing one pass on the object to be printed 15. That is, the print head unit 30 prints while moving from one side of the object to be printed 15 to the other side (for example, from left to right). When the print head unit 30 moves while printing, the print head unit 30 normally prints one pass. As shown in FIGS. 5 and 6, after printing in the image print area 15a during one-pass printing, the color-specific print lines 15c can also be printed in the non-printed area 15b in succession. Proceed with printing. On the contrary, it is also possible to print the non-printing area 15b first in one-pass printing and to continue printing the image print area 15a continuously.

Therefore, when printing a specific image on the print object 15, the non-printing area 15b is printed in every pass, so that the vision camera 40 can be used to quickly check and cope with the output of a specific color. do. Of course, if necessary, the printing of the non-printing area 15b may be configured to proceed once every predetermined pass.

Next, the print state of the non-printing area 15b, which is performed as described above, is photographed using the vision camera 40 to determine whether a specific color is not printed by the reading unit 51 of the print control unit 50. .

In this case, whether a specific color is not printed may be determined as a case where the print line 15c of a specific color does not appear or when the print line 15c for each color is broken.

Next, when a particular color is not printed, the print control unit 53 moves the print head unit 30 to the head groove 25, which is the cleaning area of the print nozzle 31, after printing. The blockage of the nozzle 31 is eliminated.

As described above, the clogging method of the printing nozzle 31 is a method of forcibly injecting ink only from the printing nozzle 31 to which ink is not ejected or forcibly ejecting ink from all the printing nozzles 31, or an operator. Can be used to directly check the print nozzle 31 and resolve the blocked state, or a method of spraying a cleaning fluid or the like into the injection hole of the print nozzle 31 to solve the problem.

As described above, when the clogging state of the print nozzle 31 is eliminated, the print head unit 30 is moved to the side where the print object 15 is located, and then printing is again performed.

7 is a perspective view showing an inkjet printer capable of realizing a nozzle clogging method according to another embodiment of the present invention.

In the above-described nozzle block elimination method of the embodiment, the non-printing area 15b is set in the printing object 15. However, in another embodiment, the nozzle block elimination method of the nozzle block blocking printout 18 is performed separately from the printing object 15. It arrange | positions and prints to determine whether the printing nozzle 31 is clogged with this clogging determination printed matter 18. FIG.

That is, the print object 15 is used only as an object for printing the image to be printed by the user, and the blockage judgment printed matter 18 is disposed in parallel with the print object 15 on the stage to determine whether the print nozzle 31 is blocked. It is used as an object for doing.

In this way, when the printed object 15 and the clogging judgment printed matter 18 are distinguished, the printed object 15 does not need to be printed to determine whether the print nozzle 31 is blocked. It is not necessary to perform the post-processing work, such as cutting the printed part of the non-printed area 15b in the object 15.

The clogging judgment printed matter 18 is preferably arranged as close as possible to the printing object 15, and when the width is wide in the printing direction (pass direction), the printed object 18 is not printed even when the printing object is replaced and newly printed. Printing to determine whether the blockage is blocked in the portion ("B" portion in FIG. 7) can be continued and can be used repeatedly several times without replacing.

As described above, the method for eliminating the clogging of the nozzle using the clogging judgment printed matter 18 is also performed in the same manner except that the method for eliminating the clogging of the nozzle of the embodiment described above and the object to be printed 15 are separately configured.

That is, the nozzle clogging method according to another embodiment of the present invention arranges the printed object 15 and the clogged printed matter 18 side by side, and also prints the clogged printed matter 18 when printing an image on the printed object 15. Proceed together. In this case, when the print head unit 30 performs one pass printing while moving from one side of the object to be printed 15 to the other side, it is preferable to print the same path printing continuously to the clogging judgment printed matter 18. .

Then, the printing state of the clogging judgment printed matter 18 is photographed to determine whether a specific color is not printed, and when the specific color is not printed, the print head unit 30 equipped with the print nozzles 31 is printed. After moving to the cleaning area of the nozzle 31, the clogging of the printing nozzle 31 is removed, and then the print head unit 30 is moved again to the side where the print object 15 and the clogging judgment printed matter 18 are located. Proceed.

The nozzle clogging method other than the above may be made in the same manner as the nozzle clogging method of the embodiment described above.

On the other hand, the present invention, as well as a technique for removing the clogging of the print nozzle, it is possible to inspect whether the ink is normally supplied to the print nozzle, whether or not to replace the ink, and also printed on the non-printed area printing or clogged printed matter By measuring the printing state, it is also possible to measure the ink output state of the printing nozzle.

As described above, the technical ideas described in the embodiments of the present invention can be performed independently of each other, and can be implemented in combination with each other. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

1 is a schematic perspective view of a conventional inkjet printer,

Figure 2 is a schematic perspective view showing an inkjet printer equipped with a nozzle clogging device of one embodiment according to the present invention,

3 is a plan view of the inkjet printer shown in FIG.

Figure 4 is a block diagram showing a nozzle clogging device of the inkjet printer according to the present invention,

5 is a reference diagram showing a normal printing in the present invention,

6 is a reference diagram showing a state when a particular nozzle clogging in the present invention,

Figure 7 is a perspective view showing a nozzle clogging device of another embodiment of the present invention.

Claims (13)

A stage to which a print object is fixed at an upper portion thereof; A head support mounted on the stage to be movable in the Y axis direction; A print head unit installed on the head support so as to be movable in the X-axis direction and having a plurality of print nozzles to perform a print job on the print object; A vision camera provided in the print head unit and photographing a state in which ink is ejected from the print nozzle and printed on a printing object; And a print control unit for determining whether or not to print a specific color by using the photographing information of the vision camera and outputting a control signal for eliminating the blockage of the printing nozzle that ejects ink of the color. Inkjet printer. The method according to claim 1, The object to be printed is divided into a print area for printing an image to be printed by the user and a non-print area for printing to determine whether the print nozzle is clogged outside the print area is characterized in that Equipped inkjet printer. The method according to claim 1, The object to be printed is a portion for printing an image to be printed by the user, and clogging nozzles, characterized in that the clogging determination printed to be arranged in parallel with the object to be printed on the stage to determine whether the print nozzle is blocked. Inkjet printer equipped with a dissolution device. The method according to claim 1, The print control unit prints lines for each color while spraying all of the ink onto the non-printing area in which the print nozzles of the print head unit are located in parallel with the non-printed area or the print object that is an area outside the image print area on the print object. The inkjet printer with a nozzle clogging device, characterized in that configured to be controlled to be printed. The method according to claim 1, The print controller may receive at least one of a reading unit that receives information photographed by the vision camera and determines whether to print a specific color, and at least one of a printing nozzle when a specific color is not printed according to a signal of the reading unit. And a clogging control unit for determining a normal printing operation after removing the clogging of the printing nozzle by moving the printing nozzle to a specific position. The method according to claim 5, The blockage canceling control unit is clogged by forcibly ejecting ink from a print nozzle or a print nozzle including the print nozzle after the print head unit is moved to a head groove provided in an outer area of the stage and then spraying unprinted colors. The inkjet printer with a nozzle clogging device, characterized in that configured to be controlled to be eliminated. A first step of dividing and printing an image printing area and a non-printing area where an image is not printed on a print object, but also printing the non-printing area when the image of the printing area is printed; A second step of determining whether a specific color is not printed by photographing a printing state of the non-printed area performed in the first step; A third step of eliminating the blockage of the print nozzle after moving the print head unit equipped with the print nozzles to the outer region of the print object when a specific color is not printed in the second step; And a fourth step of moving the print head unit toward the position where the object to be printed is located and printing again after the third step. The printed object to which the image to be printed by the user is printed, and the blockage printed matter to be printed to determine whether the print nozzles are blocked are placed side by side with the printed object, and when the image is printed on the printed object, the printed object is also printed. A first step of proceeding together; A second step of determining whether a specific color is not printed by photographing a printing state of the clogging judgment printed in the first step; A third step of eliminating the clogging of the print nozzle after moving the print head unit equipped with the print nozzles to the outer region of the object to be printed and the blockage judgment print when the specific color is not printed in the second step; And after the third step, moving the print head unit toward the position where the print object and the clogging judgment printed material are located, and then printing again. The method of claim 7, In the first step, the printing in the non-printing area is the nozzle of the inkjet printer, characterized in that for printing so as to form a printing line for each color by spraying ink from all the printing nozzles. The method according to claim 7 or 8, In the second step, it is determined whether a specific color is not printed when the printing line of a specific color does not appear or when the printing line for each color is broken. The method according to claim 7, In the first step, the nozzle clogging of the inkjet printer, characterized in that the same pass printing is continuously performed in the non-printing area when the print head unit performs one pass printing while moving from one side to the other side of the object to be printed. Way. The method according to claim 8, In the first step, when the print head unit performs one pass printing while moving from one side to the other side of the object to be printed, the clogging judgment printed material is disposed so that the same path printing proceeds continuously to the clogging judgment printed matter. How to eliminate nozzle clogging in inkjet printers. The method according to claim 7 or 8, In the third step, the clogging of the print nozzle, the nozzle clogging method of the inkjet printer, characterized in that the method of forcibly outputting the ink of the printing nozzle for ejecting the ink of a specific non-printed color.

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