JP4401444B2 - Inkjet recording apparatus and printing defect check pattern printing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus that performs printing by spraying ink on paper.
[0002]
[Prior art]
A communication device such as a facsimile device and an information processing device such as a personal computer are usually connected to a recording device capable of printing these data on paper so as to record data consisting of characters and figures as visual information. . In this recording device, various printing methods such as impact method, thermal method, ink jet method, etc. are adopted, but in recent years, ink jet method that is excellent in quietness and can print on paper of various materials is adopted. Inkjet recording apparatuses that have been used are frequently used.
[0003]
In the above-described ink jet recording apparatus, for example, a print head in which nozzles for 64 channels are arranged in the sub-scanning direction and a sheet are arranged to face each other, and ink is ejected from the nozzles and sprayed on the sheet while performing the main scanning of the print head. After printing for one band by the above, printing is performed on the entire surface of the sheet by repeating the printing process of sub-scanning this sheet by one band width. Accordingly, the ink jet recording apparatus that performs printing by such an operation requires quick drying of the ink so that the ink sprayed onto the paper does not stain other than the sprayed portion, while achieving high-definition print output. In addition, since the nozzle is required to have a small diameter, the nozzle is clogged due to the coagulation of the ink, and printing defects are likely to occur.
[0004]
Therefore, in the conventional ink jet recording apparatus, as shown in FIG. 8, linear markings 51a corresponding to the respective nozzles are formed by sequentially selecting and printing the nozzles for each of a plurality of channels while performing the main scanning of the print head. Are printed at equal intervals in the sub-scanning direction, and the markings 51a of the check pattern 51 are read by an operator or an optical sensor to detect clogging of the nozzles.
[0005]
[Problems to be solved by the invention]
By the way, in actual printing, when ink is supplied from the ink cartridge to the print head via the mesh filter and the ink flow path, the back pressure of the ink cartridge, the flow resistance of the mesh filter and the ink flow path, etc. Since it exists as an obstruction factor, if the amount of ink used increases, the amount of ink supplied may not catch up with the amount of ink used, and printing defects may occur.
[0006]
Therefore, it is desirable to be able to inspect printing defects due to insufficient supply of ink using the check pattern 51. However, in the conventional configuration, the amount of ink used per unit time required for printing the check pattern 51 is used. Since the (printing duty) is smaller than the amount used in actual printing, the above-mentioned printing failure cannot be detected.
[0007]
Therefore, as shown in FIG. 9, in addition to the check pattern 51 for defective printing due to clogging, if the full solid print check pattern 52 for defective printing due to insufficient ink supply is printed on another band, FIG. As shown, it is possible to detect printing defects due to insufficient ink supply.
[0008]
However, in this case, since it is necessary to print the check patterns 51 and 52 for two bands, there is a problem that it takes a long time to check for defective printing. Furthermore, there is a problem that even if a printing failure occurs in the check pattern 52, the channel of the nozzle that has caused the printing failure cannot be specified.
[0009]
Therefore, the present invention provides an ink jet recording apparatus capable of completing in a short time a print defect inspection due to nozzle clogging and a print defect inspection due to insufficient ink supply, and further causes a print defect. An object of the present invention is to provide an ink jet recording apparatus that can also specify a channel of a nozzle.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 is an ink jet recording apparatus that prints by ejecting ink supplied to a print head from a plurality of nozzles of the print head to a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment parts are alternately arranged in the scanning direction of the print head. Become The check pattern creation process is stored and the check pattern print signal is stored. Depending on Print the check pattern The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of a plurality of nozzles, and the plurality of markings are arranged in the sub-scanning direction. The check pattern ink amount adjustment portion is formed by ejecting ink from all nozzles, and the amount of ink necessary for printing the ink amount adjustment portion. The influence occurs when the inspection portion is printed, and a printing failure due to insufficient ink supply appears in the inspection portion, thereby detecting a printing failure due to clogging of the nozzle and a printing failure due to insufficient ink supply. thing It is characterized by. As a result, by printing a check pattern that can detect printing failures due to nozzle clogging and printing failures due to insufficient ink supply, these printing failures can be inspected at the same time. It can be completed in a short time. In addition, the influence of the ink supply amount required in the ink amount adjustment portion can also be caused in the inspection portion, and printing defects due to insufficient ink supply can appear in the inspection portion.
The invention of claim 2 is an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. The ink amount adjustment part is arranged in parallel in the scanning direction of the print head. Become The check pattern creation process is stored and the check pattern print signal is stored. Depending on Print the check pattern The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets from selected nozzles, and the plurality of markings are stepped in units in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle, and the influence of the ink amount necessary for printing the ink amount adjustment portion. Occurs when the inspection portion is printed, and a printing failure due to insufficient ink supply appears in the inspection portion, thereby detecting a printing failure due to clogging of the nozzle and a printing failure due to insufficient ink supply. It is characterized by.
[0011]
The invention of claim 3 is the ink jet recording apparatus according to claim 1 or 2. ,in front The printing duty can be changed. As a result, the print area of the check pattern or the ink amount of the check pattern can be arbitrarily set, so that the check pattern can correspond to various print forms.
[0012]
[0013]
[0014]
[0015]
Claim 4 The present invention is a method for printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment part The Printing alternately in the scanning direction of the print head The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of the plurality of nozzles, and the plurality of markings are equally spaced in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from all the nozzles, and the influence of the ink amount necessary for printing the ink amount adjustment portion is affected. When the inspection portion is printed, a printing failure due to insufficient ink supply appears in the inspection portion, and the printing failure due to clogging of the nozzles and the printing failure due to insufficient ink supply occur in the inspection portion. Appearing in a part It is characterized by.
Claim 5 The present invention is a method for printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment part , Printing in parallel in the scanning direction of the print head The inspection portion of the check pattern is composed of a plurality of markings formed by continuously ejecting ink droplets from the selected nozzle, and the plurality of markings are formed in a stepped unit in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle, and the influence of the ink amount necessary to print the ink amount adjustment portion is Occurring when printing the inspection portion, a printing failure due to insufficient ink supply appears in the inspection portion, and a printing failure due to clogging of the nozzle and a printing failure due to insufficient ink supply are represented by the inspection portion. To appear in It is characterized by.
[0016]
Claim 6 The invention of claim 4 or 5 The printing defect check pattern printing method described ,in front The printing duty can be changed.
[0017]
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. The ink jet recording apparatus according to the present embodiment has a main substrate 1 as shown in FIG. The main board 1 includes a ROM unit 2 that stores various processing routines such as a printing process, a purge process that eliminates clogging, and a check pattern creation process that creates a check pattern, and a print buffer that stores print data. A RAM unit 3 in which a storage area is formed and a CPU unit 4 that executes the above-described various processing routines are provided. When the CPU unit 4 executes the check pattern creation processing routine, printing due to clogging is performed. The check pattern 15 shown in FIGS. 1A and 1B is printed so that a defect and a printing defect due to insufficient ink supply can be detected at the same time.
[0019]
That is, as shown in FIGS. 1A and 1B, the CPU 4 prints a check pattern 15 in which inspection portions 15a and ink amount adjustment portions 15b are alternately formed in the main scanning direction. Yes. The inspection portion 15a is composed of markings 15c formed by ejecting ink from nozzles sequentially selected for each of a plurality of channels, and print defects are caused by at least one of nozzle clogging and insufficient ink supply. The resulting nozzle channel is identified by the missing marking 15c. On the other hand, the ink amount adjusting portion 15b performs full solid printing by ejecting ink from all the nozzles so that the ink consumption during printing of the inspection portion 15a corresponds to the ink consumption during normal printing. The print duty is adjusted.
[0020]
The printing duty is the ratio of the area covered with ink (printing area) to the total area of the check pattern, or the ratio of the ink amount per unit area to the ink amount at the time of full solid printing. The print duty is preferably set to 15% or more so that a print defect due to insufficient ink supply appears in the check pattern 15 remarkably. Further, the inspection portion 15a and the ink amount adjustment portion 15b cause the influence of the ink supply amount required in the ink amount adjustment portion 15b also in the inspection portion 15a, and print defects due to insufficient supply of ink to the inspection portion 15a. It is desirable that the interval is set to be several tens of milliseconds so as to appear.
[0021]
Further, as shown in FIG. 2, a duty change switch 6, a check pattern print button (not shown), a purge button, and the like are connected to the CPU unit 4 via the I / O unit 5. The print duty of a later-described check pattern is set to be changeable. The check pattern printing button prints the check pattern 15 shown in FIGS. 1A and 1B by outputting a check pattern creation signal and executing a check pattern creation process. Further, the purge button outputs a purge signal to execute a purge process, thereby forcibly discharging ink from the nozzles to eliminate clogging.
[0022]
Further, a print head driving circuit 8 provided on the carriage substrate 7 and a CR motor driving circuit (not shown) are connected to the CPU unit 4. The CR motor driving circuit is configured to rotate the CR motor 22 shown in FIG. On the other hand, the print head drive circuit 8 is connected to the print head mechanism 21 including the electrical contact portion 41a and the print head 10 via the electrical contact portion 41b. As shown in FIG. 3, the print head mechanism 21 is fixed to the carriage 23 such that the ink ejection direction is a predetermined angle with respect to the paper 25. The carriage 23 is movably supported by a guide shaft 24 and a guide plate 27 that are horizontally provided in the main scanning direction X, and is connected to a scanning belt 26 driven by a CR motor 22. The driving CR motor 22 performs main scanning while keeping the print head mechanism 21 at a constant distance from the paper 25 by reciprocating the carriage 23 along the guide shaft 24 in the main scanning direction X. Yes.
[0023]
As shown in FIGS. 4 and 5, the print head mechanism 21 includes a cartridge holding member 31, an ink supply member 37 provided on the cartridge holding member 31, and an ink provided detachably on the cartridge holding member 31. And a cartridge 30. The above-described print head 10 is held at the front portion of the ink supply member 37. The print head 10 includes a nozzle member 39 having nozzles for, for example, 64 channels in the sub-scanning direction, and a piezoelectric element that is displaced by a driving voltage. And an actuator member 38 that ejects ink from each nozzle by displacement of the piezoelectric element. The actuator member 38 is connected to the electrical contact portion 41 a via the drive voltage signal line 40, and the electrical contact portion 41 a is provided on the carriage 23 when the cartridge holding member 31 is mounted on the carriage 23. 2 is in contact with the electrical contact portion 41b on the carriage substrate 7, and the drive voltage from the print head drive circuit 8 in FIG.
[0024]
On the other hand, the ink cartridge 30 attached to the cartridge holding member 31 is formed in a hollow shape. Inside the ink cartridge 30, a foam 35 (porous member) having open cells so as to contain ink is loaded. In addition, an ink supply port 30a is formed in the front side wall of the ink cartridge 30 on the print head 10 side, and the ink supply member 37 is in a liquid-tight state through the seal member 42 in the ink supply port 30a. Are mated. The ink supply member 37 is formed with an ink guide path 37 a that allows the print head 10 and the ink cartridge 30 to communicate with each other. The ink guide path 37 a allows the ink contained in the foam 35 to be transferred to the entire print head 10. Supply to the channel. An air communication hole 30 b is formed on the back wall of the ink cartridge 30. The air communication hole 30 b is a volume of air corresponding to the amount of consumption when ink is consumed by printing by the print head 10. Is fed into the ink cartridge 30.
[0025]
In the above configuration, the operation of the ink jet recording apparatus will be described based on the nozzle check flowchart of FIG. When the check pattern print button is pressed, as shown in FIG. 2, a check pattern print signal is output to the CPU unit 4 via the I / O unit 5 (S1). The CPU unit 4 that has received the check pattern print signal executes a check pattern creation processing routine stored in the ROM unit 2. After reading the print duty set by the duty change switch 6, the CPU unit 4 responds to this print duty. The print data is written in a print data storage area serving as a print buffer formed in the RAM unit 3 so as to print the check pattern 15 to be printed.
[0026]
Thereafter, as shown in FIG. 3, after the paper 25 is conveyed in the sub-scanning direction Y by a paper feeding device (not shown) and reaches a predetermined position and stopped, the print head mechanism 21 is moved to the CR motor 22 and the scanning belt 26. Thus, the main scanning is performed. Then, as shown in FIG. 2, the print data of the RAM unit 3 is output to the print head drive circuit 8, and a drive voltage is applied to the print head 10 to be main scanned at a predetermined timing. As shown in (a) and (b), an ink amount adjusting portion 15b in which ink is ejected from all nozzles to make solid printing, and an inspection portion 15a in which the nozzles are sequentially selected for a plurality of channels to form markings 15c. A check pattern 15 for one band having alternating and is printed (S2).
[0027]
When the check pattern 15 is printed, it is determined by the operator or the optical sensor whether or not there is a missing dot (missing marking 15c) in the check pattern 15 (S3). At this time, if there is no missing dot as in the check pattern 15 of FIG. 1A (S3, NO), it is assumed that the printing failure due to clogging and the lack of ink supply does not cause a printing failure. The mode is returned to (S4). On the other hand, when there is a missing dot as in the check pattern 15 of FIG. 1B (S3, YES), the nozzle channel causing the printing failure is specified from the inspection portion 15a, and immediately before the execution of S1. It is determined whether or not the purge process has been performed (S5). If the purge process has been performed (S5, YES), it is determined that the ink has run out, and the ink cartridge 30 in FIG. 4 is replaced (S6).
[0028]
On the other hand, when the purge process is not performed (S5, NO), the purge button is pressed and a purge signal is output to the CPU unit 4 via the I / O unit 5 as shown in FIG. (S7). The CPU unit 4 that has received the purge signal executes a purge process routine stored in the ROM unit 2, moves the print head 10 to a purge process position (not shown), and forcibly discharges ink from the print head 10. (S8). After this, again from S1, the check pattern print button is pressed (S1) and the check pattern 15 is printed (S2), and then there is no missing dot (missing marking 15c) in the check pattern 15. (S3, NO), the printer is returned to the normal printing mode because the clogging has been eliminated by the purge process (S4). If there is a missing dot (S3, YES), it is determined that the purge process has been completed in S5. (S5, YES), the ink cartridge 30 is replaced (S6).
[0029]
The check pattern 15 in the present embodiment is formed by alternately forming inspection portions 15a and ink amount adjustment portions 15b as shown in FIGS. 1 (a) and 1 (b). There is no limit. That is, as shown in FIGS. 7A and 7B, the check pattern 15 may be a pattern in which an inspection portion 15a and an ink amount adjustment portion 15b are formed in parallel in the main scanning direction. Therefore, it is possible to accurately set the ink amount in the entire range of the check pattern 15. Further, as shown in FIGS. 1A and 1B, the check pattern 15 in the present embodiment is composed of a plurality of markings 15c... Formed in the sub-scanning direction. Of course, as shown in FIGS. 7A and 7B, the markings 15c may be formed stepwise in a unit in the sub-scanning direction. In this case, the position A (channel) of the missing marking 15c in FIG. 7B can be easily identified from reading the number of steps.
[0030]
【The invention's effect】
The invention according to claim 1 is an ink jet recording apparatus that performs printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium. To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment parts are alternately arranged in the scanning direction of the print head. Become The check pattern creation process is stored and the check pattern print signal is stored. Depending on Print the check pattern The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of a plurality of nozzles, and the plurality of markings are arranged in the sub-scanning direction. The check pattern ink amount adjustment portion is formed by ejecting ink from all nozzles, and the amount of ink necessary for printing the ink amount adjustment portion. The influence occurs when the inspection part is printed, and a printing defect due to insufficient ink supply appears in the inspection part, thereby detecting a printing defect due to clogging of the nozzle and a printing defect due to insufficient ink supply. It is the structure to do.
The invention of claim 2 is an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. The ink amount adjustment part is arranged in parallel in the scanning direction of the print head. Become The check pattern creation process is stored and the check pattern print signal is stored. Depending on Print the check pattern The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets from selected nozzles, and the plurality of markings are stepped in units in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle, and the influence of the ink amount necessary for printing the ink amount adjustment portion. Occurs when the inspection portion is printed, and a printing failure due to insufficient ink supply appears in the inspection portion, thereby detecting a printing failure due to clogging of the nozzle and a printing failure due to insufficient ink supply. It is the structure to do.
According to the first or second aspect of the present invention, it is possible to print a check pattern capable of inspecting a printing failure due to nozzle clogging and a printing failure due to insufficient supply of ink. The effect is that it can be completed in time. In addition, an effect of the ink supply amount required in the ink amount adjustment portion is caused also in the inspection portion, and there is an effect that a printing defect due to insufficient ink supply can appear in the inspection portion.
[0031]
The invention of claim 3 is the ink jet recording apparatus according to claim 1 or 2. ,in front The printing duty can be changed. Thereby, since the printing area of the check pattern or the ink amount of the check pattern can be arbitrarily set, the check pattern can be made to correspond to various printing forms.
[0032]
[0033]
[0034]
[0035]
Claim 4 The present invention is a method for printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment part The Printing alternately in the scanning direction of the print head The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of the plurality of nozzles, and the plurality of markings are equally spaced in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from all the nozzles, and the influence of the ink amount necessary for printing the ink amount adjustment portion is affected. When the inspection portion is printed, a printing failure due to insufficient ink supply appears in the inspection portion, and the printing failure due to clogging of the nozzles and the printing failure due to insufficient ink supply occur in the inspection portion. Appear in a part It is the structure characterized by this.
Claim 5 The present invention is a method for printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium, To identify the nozzle that caused printing failure Inspection part, The print duty is adjusted so that the ink consumption during printing of the inspection portion corresponds to the ink consumption during normal printing. Ink amount adjustment part , Printing in parallel in the scanning direction of the print head The inspection portion of the check pattern is composed of a plurality of markings formed by continuously ejecting ink droplets from the selected nozzle, and the plurality of markings are formed in a stepped unit in the sub-scanning direction. The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle, and the influence of the ink amount necessary to print the ink amount adjustment portion is Occurring when printing the inspection portion, a printing failure due to insufficient ink supply appears in the inspection portion, and a printing failure due to clogging of the nozzle and a printing failure due to insufficient ink supply are represented by the inspection portion. It is made to appear in It is a configuration.
[0036]
Claim 6 The invention of claim 4 or 5 In the printing defect check pattern printing method described above, the printing duty can be changed.
[0037]
[Brief description of the drawings]
1A and 1B are explanatory diagrams showing a state of a check pattern, in which FIG. 1A is a diagram showing a state where no printing failure has occurred, and FIG. 1B is a diagram showing a state where printing failure has occurred;
FIG. 2 is a block diagram of a control system of the ink jet recording apparatus.
FIG. 3 is a perspective view of a main part of the ink jet recording apparatus.
FIG. 4 is an explanatory diagram illustrating a state where an ink cartridge is mounted.
FIG. 5 is a cross-sectional view of a print head mechanism.
FIG. 6 is a flowchart of nozzle check.
7A and 7B are explanatory diagrams showing a state of a check pattern, in which FIG. 7A is a diagram showing a state where no printing failure has occurred, and FIG. 7B is a diagram showing a state where printing failure has occurred.
FIG. 8 is an explanatory diagram showing a state of a conventional check pattern.
FIG. 9 is an explanatory diagram showing a state of a conventional check pattern.
FIG. 10 is an explanatory diagram showing a state of a conventional check pattern.
[Explanation of symbols]
6 Duty change switch
7 Carriage board
8 Print head drive circuit
10 Print head
15 Check pattern
15a Inspection part
15b Ink amount adjustment part
15c marking
21 Print head mechanism
22 CR motor
23 Carriage
24 Guide shaft
25 paper
26 Scanning belt
27 Guide plate
30 Ink cartridge
30a Ink supply port
31 Cartridge holding member
35 forms
37 Ink supply member
38 Actuator member
39 Seal member

Claims (6)

An ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium,
An inspection part for identifying a nozzle that has caused a printing defect, and an ink amount adjustment part for adjusting the printing duty so that the ink consumption during printing of the inspection part corresponds to the ink consumption during normal printing DOO may store the creation process of checking the pattern formed by alternately arranged in the scanning direction of the print head is a device for printing the check pattern in response to the print signal of the check pattern,
The inspection portion of the check pattern comprises a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of a plurality of nozzles,
The plurality of markings are formed in a plurality of units at equal intervals in the sub-scanning direction,
The ink amount adjustment part of the check pattern is formed by ejecting ink from all nozzles,
The effect of the amount of ink necessary to print the ink amount adjustment portion occurs when the inspection portion is printed, and the nozzle is clogged due to the occurrence of a printing failure due to insufficient ink supply in the inspection portion. An ink jet recording apparatus that detects a printing defect due to ink and a printing defect due to insufficient ink supply . An ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium,
An inspection part for identifying a nozzle that has caused a printing defect, and an ink amount adjustment part for adjusting the printing duty so that the ink consumption during printing of the inspection part corresponds to the ink consumption during normal printing DOO may store the creation process of checking the pattern formed by parallel arranged in the scanning direction of the print head is a device for printing the check pattern in response to the print signal of the check pattern,
The inspection part of the check pattern consists of a plurality of markings formed by continuously ejecting ink droplets from the selected nozzle,
The plurality of markings are formed in a step shape in units of one in the sub-scanning direction,
The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle,
The effect of the amount of ink necessary to print the ink amount adjustment portion occurs when the inspection portion is printed, and the nozzle is clogged due to the occurrence of a printing failure due to insufficient ink supply in the inspection portion. An ink jet recording apparatus that detects a printing defect due to ink and a printing defect due to insufficient ink supply .   The inkjet recording apparatus according to claim 1, wherein the printing duty is changeable. A method of printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium,
An inspection part for identifying a nozzle that has caused a printing defect, and an ink amount adjustment part for adjusting the printing duty so that the ink consumption during printing of the inspection part corresponds to the ink consumption during normal printing the door, printed alternately in the scanning direction of the print head,
The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets simultaneously from the nozzles selected for each of a plurality of nozzles, and the plurality of markings are arranged at equal intervals in the sub-scanning direction. It is formed in individual units,
The ink amount adjustment part of the check pattern is formed by ejecting ink from all nozzles,
The influence of the amount of ink necessary to print the ink amount adjustment portion occurs when printing the inspection portion, and printing defects due to insufficient supply of ink appear in the inspection portion,
A printing failure check pattern printing method , wherein printing failure due to clogging of the nozzle and printing failure due to insufficient supply of ink appear in the inspection portion . A method of printing a check pattern for defective printing in an ink jet recording apparatus for printing by ejecting ink supplied to a print head from a plurality of nozzles of the print head onto a recording medium,
An inspection part for identifying a nozzle that has caused a printing defect, and an ink amount adjustment part for adjusting the printing duty so that the ink consumption during printing of the inspection part corresponds to the ink consumption during normal printing the door, parallel printed in the scanning direction of the print head,
The inspection portion of the check pattern includes a plurality of markings formed by continuously ejecting ink droplets from a selected nozzle, and the plurality of markings are formed stepwise in the sub-scanning direction. And
The ink amount adjustment portion of the check pattern is formed by ejecting ink from nozzles other than the selected nozzle,
The influence of the amount of ink necessary to print the ink amount adjustment portion occurs when printing the inspection portion, and printing defects due to insufficient supply of ink appear in the inspection portion,
A printing failure check pattern printing method , wherein printing failure due to clogging of the nozzle and printing failure due to insufficient supply of ink appear in the inspection portion . 6. A printing defect check pattern printing method according to claim 4, wherein the printing duty is changeable.

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